JP2005334054A - Medical knife - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical knife for incising a biotissue such as an eyeball, not only providing different incising widths but also sequentially and surely providing an intended incising width. <P>SOLUTION: A blade part 3 of this medical knife is provided with an edge incising part 6 extending from a point part 4 to the side of a base end 5, an edge incising width retaining part 8 extending from an edge boundary part 7 of the edge incising part 6 to the side of the base end 5 and an intermediate incising part 10 extending from an intermediate boundary part 9 of the edge incising width retaining part 8 to the side of the base end part 5. When the edge incising part 6 is pushed into the eyeball in using and an incising opening of the eyeball incised by the edge incising part 6 reaches the edge incising width retaining part 8 from the edge incising part 6, this medical knife senses the reduction in an incising resistance to stop the insertion of the blade part 3, and the incising width inciseable by the edge incising part 6 reaches the maximum to prevent the incised opening from getting wider than its incising width. Then, when the incised opening reaches the intermediate incising part 10 from the edge incising width retaining part 8, the incised opening is incised further by the intermediate incising part 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a medical blade used as various surgical cutting tools for incising a living tissue such as an eyeball.

  In this type of medical blade (see also Patent Document 1 below), as shown in FIG. 2A, the blade body portion 3 of the blade plate 2 extends from the tip portion 4 to the base end portion 5 of the blade plate 2. A distal incision portion 6 extending to the side, and a distal incision width maintaining portion 8 extending from the distal end boundary portion 7 to the distal incision portion 6 toward the proximal end portion 5 side of the blade plate 2 are provided. In the tip incision 6, a blade edge 18 is formed from the pointed end 4 of the blade body 3 to both ends 13 of the tip boundary 7. In the distal incision width maintaining portion 8, outer end edges 20 extending from both end portions 13 of the distal end boundary portion 7 to the proximal end portion 5 side of the blade plate 2 are formed, and an interval between both outer end edges 20 is defined as a distal end boundary. It is smaller than the interval between both end portions 13 of the portion 7.

  Conventionally, when the lens of the eyeball becomes cloudy due to cataract, for example, two types of medical blades with different distances between the two blade edges 18 of the tip incision 6 are sequentially used, and the eyeball is operated according to the following procedure. I was going.

  First, a first medical blade having a distance between both blade edges 18 that matches the outer diameter of the suction cylinder is prepared, and a part of the eyeball is incised by the first medical blade. A suction cylinder is inserted into the eyeball from the incision, and the contents of the torn lens are ultrasonically emulsified and sucked by the suction cylinder. Next, a second medical blade whose width between the blade edges 18 is wider than that of the first medical blade is prepared, and the incised portion is widened by the second medical blade. An intraocular lens is inserted into the eyeball from the incision.

However, since there are troublesome preparations of two types of medical blades, for example, the two blade edges 18 are inflated into a V shape as shown in FIG. 2 (b) at the distal incision 6, or as shown in FIG. 2 (c). In other words, there has been proposed a medical blade that is formed in a V-shape and has both edge edges 18 formed with narrowly spaced edge edges 18a and widely spaced edge edges 18b.
JP 2001-238890 A

  However, in the both edge edges 18 of the medical blade shown in FIGS. 2B and 2C, the both edge edges 18a having a narrow interval and the both edge edges 18b having a wide interval are continuously formed, and the distance between them is increased. Since it changes suddenly, when the eye surgery described above is performed with the medical blade shown in FIGS. 2B and 2C, a part of the eyeball is incised beyond the incision width necessary for inserting the suction tube into the eyeball. There was a risk of it. If the incision width is too wide, a gap more than necessary is generated between the incision portion and the suction cylinder, and there is a possibility that problems such as a decrease in intraocular pressure may occur.

  According to the present invention, in a medical blade for incising a living tissue such as an eyeball, the shape of the blade body part is obtained in order to surely obtain a desired incision width in addition to obtaining different incision widths with one medical blade. It aims to improve.

  Drawings of embodiments described later (first embodiment shown in FIGS. 1 and 3, second embodiment shown in FIG. 4, third embodiment shown in FIG. 5, fourth embodiment shown in FIG. 6, fifth shown in FIG. The present invention will be described with reference to the embodiment, the sixth embodiment shown in FIG.

The medical blade according to the first and second aspects of the present invention has the following common configuration.
The blade part (3) has a distal incision (6) extending from the distal end (the end 4 or the rounded end) toward the proximal end (5), and the distal end of the distal incision (6). From a distal incision width maintaining part (8) extending from the boundary part (7) to the base end part (5) side of the blade body part (3), and an intermediate boundary part (9) between the distal incision width maintaining part (8) An intermediate incision (10) extending toward the base end (5) of the blade body (3). In the tip incision (6), the tip outer edge (14) extends from the tip (4) of the blade body (3) to both ends (13) of the tip boundary (7) and the tip A first tip surface (15) and a second tip surface (16) defined between both outer end edges (14) of the incision portion (6) are provided, and both outer ends of the tip incision portion (6) are provided. A cutting edge (18) is formed on at least one outer edge (14) of the edge (14). In the distal incision width maintaining portion (8), an intermediate outer edge (20) is extended from both end portions (13) of the distal end boundary portion (7) to the proximal end portion (5) side of the blade body portion (3). In addition, a first intermediate surface (21) and a second intermediate surface (22) defined between both intermediate outer edges (20) of the distal incision width maintaining portion (8) are provided. In the intermediate incision (10), from the both ends (19) of the intermediate boundary (9) between the intermediate incision (10) and the tip incision width maintaining part (8), the blade body (3) A first intermediate surface (26) extending between the intermediate outer end edge (25) of the intermediate incision portion (10) and a first intermediate surface (26) extending from the intermediate end portion (25) toward the base end portion (5) side. Two intermediate surfaces (27) are provided, and a blade edge (29) is formed on at least one intermediate outer edge (25) of both intermediate outer edges (25) of the intermediate incision (10).

Furthermore, in the invention of claim 1, the following configuration is added to the common configuration.
The distance (W24) between both intermediate outer edges (20) of the distal incision width maintaining part (8) is set equal to the distance (W13) between both ends (13) of the distal boundary part (7). Both intermediate outer edges (20) of the incision width maintaining portion (8) are extended in parallel to each other, or a distance between both intermediate outer edges (20) of the distal incision width maintaining portion (8) (W24). The intermediate outer edge (20) of the distal incision width maintaining portion (8) is extended so as to be set smaller than the interval (W13) between both ends (13) of the distal boundary portion (7). Yes. Further, the interval (W29) between the intermediate outer end edges (25) of the intermediate incision portion (10) is set to an intermediate boundary portion (9) between the intermediate incision portion (10) and the tip incision width maintaining portion (8). ) Is set to be larger than the interval (W19) between both end portions (19) of the intermediate incision portion (10), and both intermediate outer end edges (25) are arranged on the base end portion (5) side of the blade body portion (3). The intermediate outer end edge (25) of the intermediate incision part (10) is wider than the distance (W13) between both end parts (13) of the tip boundary part (7). Includes an effective outer edge with a large spacing (W29).

Furthermore, in the invention of claim 2, the following configuration is added to the common configuration.
At the intermediate boundary portion (9) between the distal incision width maintaining portion (8) and the intermediate incision portion (10) while passing through the distal end portion (4) of the blade body portion (3) and intersecting the distal end boundary portion (7). This both-tip assumed surface (C) including the assumed tip surface (C) that is parallel to the section screen (B) including the dividing line (A) intersecting and that passes through both end portions (13) of the tip boundary portion (7). Both intermediate outer edges (20) of the distal incision width maintaining part (8) are extended inside the intermediate range. Moreover, while passing through the front-end | tip part (4) of a blade body part (3), and crossing a front-end | tip boundary part (7), the intermediate | middle boundary part (9) between a front-end incision width maintenance part (8) and an intermediate incision part (10) ) Are parallel to the section screen (B) including the section line (A) intersecting with both ends of the intermediate boundary section (9) between the distal incision width maintaining section (8) and the intermediate incision section (10). Gradually, the two outer outer edges (25) of the intermediate incision (10) toward the base end (5) side of the blade body (3) outside the range between the intermediate assumed plane (D) passing through (19). While extending so that it may spread, both the intermediate | middle outer edge (25) of this intermediate | middle incision part (10) is the base end part (5) of a blade part (3) on the outer side of the range between the said front-end | tip assumption surfaces (C). ) It has an effective outer edge extending so as to gradually expand toward the side.

In addition to the intermediate incision width maintaining portion (12) according to the invention of claim 3, a step portion for a stopper is provided on the blade body portion (3) closer to the base end portion (5) than the intermediate incision portion (10). It may be formed.
The invention of claim 3 based on the invention of claim 1 or claim 2 is configured as follows.

  In addition to the tip incision portion (6), the tip incision width maintaining portion (8), and the intermediate incision portion (10), the blade body portion (3) has an intermediate boundary portion (11) with the intermediate incision portion (10). ) To the proximal end (5) side of the blade body (3). In this intermediate incision width maintaining part (12), the blade part (3) from both ends (30) of the intermediate boundary part (11) between the intermediate incision width maintaining part (12) and the intermediate incision part (10). ) Of the intermediate outer end edge (31) toward the base end portion (5) side and a first intermediate surface (between the intermediate outer end edges (31) of the intermediate incision width maintaining portion (12)). 32) and a second intermediate surface (33). The space (W31) between the intermediate outer end edges (31) of the intermediate incision width maintaining portion (12) is set to the intermediate boundary portion (11) between the intermediate incision width maintaining portion (12) and the intermediate incision portion (10). The intermediate outer end edges (31) of the intermediate incision width maintaining part (12) are set to extend in parallel with each other by setting it equal to the interval (W30) between both ends (30) of An interval (W31) between both intermediate outer end edges (31) of the width maintaining portion (12) is determined at both ends of the intermediate boundary portion (11) between the intermediate incising width maintaining portion (12) and the intermediate incising portion (10). Both intermediate outer edges (31) of the intermediate incision width maintaining part (12) are extended so as to be set smaller than the interval (W30) between the parts (30). Alternatively, an intermediate boundary portion (9) between the distal incision width maintaining portion (8) and the intermediate incision portion (10) while passing through the distal end portion (4) of the blade body portion (3) and intersecting the distal end boundary portion (7). ) And an intermediate incision parallel to the section screen (B) including the partition line (A) that also intersects the intermediate boundary part (11) between the intermediate incision part (10) and the intermediate incision width maintaining part (12) Between both base end assumption surfaces (E) including the base end assumption surfaces (E) passing through both end portions (30) of the intermediate boundary portion (11) between the portion (10) and the intermediate incision width maintaining portion (12) Both intermediate outer end edges (31) of the intermediate incision width maintaining part (12) are extended inside the range.

  Further, the blade part (3) is closer to the proximal end part (5) than the intermediate incision width maintaining part (12), and the distal incision part (6) as the first incision part and the second incision part are provided. A third incision part may be provided in addition to the intermediate incision part (10), and the incision part and the incision width maintaining part can be provided alternately one after another.

  Incidentally, the cutting edge (18, 24, 29) means a sharp shape having a cutting function. Also, both outer end edges (14) of the distal incision part (6), both intermediate outer edges (20) of the distal incision width maintaining part (8), and both intermediate outer edges (25) of the intermediate incision part (10). ) And the intermediate incision width maintaining part (12), both intermediate outer end edges (31) include those having a function as a blade edge and those having no function, and are formed with an inclined surface similar to the cutting surface. If the shape is not sharp, it can be understood that it does not have a function as a cutting edge, and in that case, a guiding function is exhibited instead of the cutting function.

  In the first to third aspects of the invention, the distal incision width maintaining portion (8) is interposed between the distal incision (6) and the intermediate incision (10). When the eyeball is pushed into the eyeball, when the incision of the eyeball incised by the tip incision portion (6) reaches the tip incision width maintaining portion (8) from the tip incision portion (6), the tip incision portion (6) can be incised. The maximum incision width is maximized and the incision does not extend beyond the incision width. Thereafter, when the incision reaches from the distal incision width maintaining portion (8) to the intermediate incision portion (10), the incision is further incised by the intermediate incision portion (10). Therefore, a desired incision width can be obtained sequentially and reliably.

  In the invention of claim 4 based on the invention of claim 1, claim 2, or claim 3, a blade edge (18) is formed on each outer end edge (14) of both ends of the tip incision (6). A cutting edge (29) is formed on each of the intermediate outer edges (25) of the intermediate incision (10). In the invention of claim 4, the cutting operation can be smoothly performed by the both blade edges (18, 29) of the distal cutting portion (6) and the intermediate cutting portion (10).

  In the invention of claim 5 premised on the invention of claim 4, a blade edge (24) is formed on each of the intermediate outer end edges (20) of the tip incision width maintaining portion (8). In the invention of claim 5, when shifting from the tip incision portion (6) to the intermediate incision portion (10), the transition can be smoothly performed by the both edge edges (24) of the tip incision width maintaining portion (8). .

  In the invention of claim 6 premised on the invention of claim 4 or claim 5, the assumed cutting edge surfaces including the cutting edge (18) at the outer end edges (14) of both ends of the tip incision (6) are mutually connected. The cutting edge angle (θ18) formed by intersecting the cutting edge expected surface including the cutting edge (29) at both intermediate outer end edges (25) of the intermediate incision portion (10) and the cutting edge angle (θ29) formed by intersecting each other. Are set equal to each other. In the invention of claim 6, the incision operation by the distal incision portion (6) and the incision operation by the intermediate incision portion (10) can be smoothly performed with the same feel of incision resistance or the like. Here, “setting the blade edge angle (θ18) and the blade edge angle (θ29) to be equal to each other” also means that they are substantially equal to the extent that this effect is exhibited.

  In the invention of claim 7 premised on the invention of claim 4 or claim 5, a cutting edge assumed surface including a cutting edge (18) at both outer ends (14) of the tip of the tip incision (6); The cutting edge assumed surface including the cutting edge (29) at both intermediate outer edges (25) of the intermediate incision (10) is set in parallel to each other. In the invention of claim 7, the incision operation by the distal incision portion (6) and the incision operation by the intermediate incision portion (10) can be smoothly performed by the same feel of incision resistance or the like. Here, “setting the blade edge assumed surface including the blade edge (18) and the blade edge assumed surface including the blade edge (29) to be parallel to each other” means that they are substantially parallel to the extent that this effect is exhibited. means.

  In the invention of claim 8 premised on the invention of any one of claims 4 to 7, the blade edges (18) at the outer end edges (14) of both ends of the tip incision (6). A specific incision width (W13) between the incision width display part (34) for displaying an actual size and a specific incision width between the cutting edge (29) at both intermediate outer edges (25) of the intermediate incision part (10) An incision width display section (34) for displaying the actual dimensions for (W30) is provided. In the invention of claim 8, since the incision operation can be performed while confirming the actual dimensions with these incision width display portions (34), it becomes easy to select a desired medical knife.

  In the invention of claim 9 based on the invention of any one of claims 4 to 8, the tip incision portion (6) is attached to a specific incision depth portion from the tip portion (4). When the incision width assumption surface (F) passing through the mark (35) intersects the blade edge (18) at the outer end edges (14) of both ends of the tip incision (6), the incision width assumption surface (F) The interval (W13) between the intersections with both the blade edges (18) is set to a specific incision width between the blade edges (18) at both outer edges (14) of the distal incision portion (6), and the intermediate An incision width assumption plane (G) passing through a mark (36) attached to a specific incision depth portion from the distal end portion (4) of the distal incision portion (6) at the incision portion (10) is the intermediate incision portion (10). When intersecting the cutting edge (29) at both intermediate outer edges (25), the incision width assumption surface (G) and both cutting edges ( 9) the distance between the intersection of the (W30) is set to a particular incision width between blade edge (29) in both the intermediate outer edge (25) of the intermediate cutouts (10). In the invention of claim 9, the incision work can be smoothly performed while confirming the specific incision depth and the specific incision width with these marks (35, 36).

  The present invention can obtain a desired incision width sequentially and surely in a medical blade for incising a living tissue such as an eyeball, as well as different incision widths with one medical blade.

[First Embodiment]
Hereinafter, the medical blade according to the first embodiment of the present invention will be described with reference to FIGS.
A medical blade shown in FIG. 1A is a surgical cutting tool for incising an eyeball, and includes a handle 1 made of synthetic resin and a blade plate 2 made of metal. The blade plate 2 is bent into a shape attached to the handle portion 1, and a blade body portion 3 shown in FIGS. 1B and 1C is formed at the tip of the blade plate 2. As shown in FIGS. 3 (a) and 3 (b), the blade body 3 includes a tip incision 6 extending from the tip 4 (tip) to the base end 5 of the blade plate 2, and the tip incision. A distal incision width maintaining portion 8 extending from the distal end boundary portion 7 to the proximal end portion 5 side of the blade plate 2, and an intermediate boundary portion 9 between the distal incision width maintaining portion 8 and the proximal end portion 5 side of the blade plate 2 And an intermediate incision width maintaining portion 12 extending from the intermediate boundary portion 11 of the intermediate incision portion 10 to the base end portion 5 side of the blade plate 2.

  In the front end incision 6, a front end outer edge 14 extends from the pointed end 4 of the blade body 3 to both ends 13 of the front end boundary 7, and between the two front end outer edges 14 of the front end incision 6. The front end surface 15 (first front end surface) and the front end back surface 16 (second front end surface) to be partitioned are provided in parallel to each other. A blade edge 18 is formed in a single-blade shape on the entire outer edge 14 of the distal end incision 6 by a bladed surface 17 formed only on the distal surface 15 side.

  In the distal incision width maintaining portion 8, an intermediate outer edge 20 extends from both end portions 13 of the distal end boundary portion 7 to both end portions 19 of the intermediate boundary portion 9 with the intermediate incision portion 10. An intermediate surface 21 (first intermediate surface) and an intermediate back surface 22 (second intermediate surface) defined between both intermediate outer edges 20 of the incision width maintaining unit 8 are provided in parallel to each other. A blade edge 24 is formed in a single-edged shape on the whole of the intermediate outer edge 20 of the tip incision width maintaining portion 8 by a bladed surface 23 formed only on the intermediate surface 21 side. The double-edged surface 23 and the double-edged edge 24 of the distal incision width maintaining portion 8 are continuous to the double-edged surface 17 and the double-edged edge 18 of the distal incised portion 6 via the distal boundary 7. The intermediate surface 21 of the tip incision width maintaining portion 8 is smoothly flush with the tip surface 15 of the tip incision portion 6 through the tip boundary portion 7. The intermediate back surface 22 of the front end incision width maintaining portion 8 is smoothly and flush with the front end back surface 16 of the front end incision portion 6 through the front end boundary portion 7.

  In the intermediate incision portion 10, the intermediate outer end extends from both end portions 19 of the intermediate boundary portion 9 between the intermediate incision portion 10 and the distal incision width maintaining portion 8 to the intermediate boundary portion 11 with the intermediate incision width maintaining portion 12. An edge 25 extends, and an intermediate surface 26 (first intermediate surface) and an intermediate back surface 27 (second intermediate surface) defined between both intermediate outer end edges 25 of the intermediate incision 10 are provided in parallel to each other. ing. A blade edge 29 is formed in a single-edged shape on the entire intermediate outer edge 25 of the intermediate incision 10 by a bladed surface 28 formed only on the intermediate surface 26 side. The double cutting edge 28 and the double cutting edge 29 of the intermediate incision 10 are connected to the double cutting edge 23 and the double cutting edge 24 of the leading incision width maintaining part 8 via an intermediate boundary 9 with the leading incision width maintaining part 8. It is continuous. The intermediate surface 26 of the intermediate incision 10 is continuously flush with the intermediate surface 21 of the distal incision width maintaining portion 8 through the intermediate boundary portion 9 with the distal incision width maintaining portion 8. The intermediate back surface 27 of the intermediate incision portion 10 is smoothly and flush with the intermediate back surface 22 of the tip incision width maintaining portion 8 through the intermediate boundary portion 9 with the tip incision width maintaining portion 8.

  In the intermediate incision width maintaining part 12, an intermediate outer edge 31 from both ends 30 of the intermediate boundary part 11 between the intermediate incision width maintaining part 12 and the intermediate incising part 10 toward the base end part 5 side of the blade plate 2. And an intermediate surface 32 (first intermediate surface) and an intermediate back surface 33 (second intermediate surface) defined between both intermediate outer edges 31 of the intermediate incision width maintaining portion 12 are provided in parallel to each other. ing. The intermediate surface 32 of the intermediate incision width maintaining portion 12 is smoothly and flush with the intermediate surface 26 of the intermediate incision portion 10 through the intermediate boundary portion 11 with the intermediate incision portion 10. The intermediate back surface 33 of the intermediate incision width maintaining portion 12 is smoothly and flush with the intermediate back surface 27 of the intermediate incision portion 10 through the intermediate boundary portion 11 with the intermediate incision portion 10.

  As described above, the cutting edge 17 is formed on the tip back surface 16 with respect to the both cutting edges 18 of the tip cutting section 6, both cutting edges 24 of the tip cutting width maintaining section 8, and both cutting edges 29 of the intermediate cutting section 10. The blade angle α (10 to 45 °), the blade angle α (10 to 45 °) formed by the bladed surface 23 with respect to the intermediate back surface 22, and the blade angle α (10 to 45 ° formed by the bladed surface 28 with respect to the intermediate back surface 27). 45 °), but also on the front back 16 side of the front end incision 6, the intermediate back 22 side of the front incision width maintaining unit 8, and the intermediate back 27 side of the intermediate incision 10. (Not shown) may be formed to have a double-edged shape (blade angle 20 to 60 ° formed by the back-side cutting surface and the front-side cutting surfaces 17, 23, 28). Further, the distal surface 15 of the distal incision 6, the intermediate surface 21 of the distal incision width maintaining portion 8, the intermediate surface 26 of the intermediate incising portion 10, and the intermediate surface 32 of the intermediate incision width maintaining portion 12 are flush with each other as described above. The front end back surface 16 of the front end incision portion 6, the intermediate back surface 22 of the front end incision width maintaining portion 8, the intermediate back surface 27 of the intermediate incision portion 10, and the intermediate back surface 33 of the intermediate incision width maintaining portion 12 are smoothly continuous. As shown, the surfaces 15, 21, 26 and the back surfaces 16, 22, 27 are parallel to each other and between the front surfaces 15, 21, 26 and the back surfaces 16, 22, 27. Have the same thickness T (see FIG. 1C). The thickness T may be gradually increased or decreased from the pointed end 4 of the blade body 3 toward the base end 5 of the blade plate 2. Moreover, the front-end | tip boundary part 7 between the front-end incision part 6 and the front-end incision width maintenance part 8, the intermediate | middle boundary part 9 between the front-end incision width maintenance part 8 and the intermediate incision part 10, the intermediate | middle incision part 10, and intermediate | middle You may provide a level | step-difference part in at least any one among the intermediate | middle boundary parts 11 between the incision width maintenance parts 12. FIG.

  It passes through the pointed part 4 of the blade body part 3, passes through the central position between both end parts 13 of the tip boundary part 7, and is perpendicular to the tip boundary part 7, and between the tip incision width maintaining part 8 and the intermediate incision part 10. Through the center position between both end portions 19 of the intermediate boundary portion 9 and perpendicular to the intermediate boundary portion 9, and the center of both end portions 30 of the intermediate boundary portion 11 between the intermediate incision portion 10 and the intermediate incision width maintaining portion 12. A central lane marking A (division line) passing through the position and orthogonal to the intermediate boundary 11 is assumed. In addition, the front end surface 15 and front end back surface 16 of the front end incision 6 and the intermediate surface 21 and intermediate back surface 22 of the front end incision width maintaining unit 8 and the intermediate surface 26 and middle of the intermediate incision 10 are included. A central section screen B (section screen) orthogonal to the back surface 27 and the intermediate surface 32 and the intermediate back surface 33 of the intermediate incision width maintaining portion 12 is assumed. Furthermore, a tip assumed surface C that is parallel to the center zone screen B and passes through both end portions 13 of the tip boundary portion 7, and that is parallel to the center zone screen B and that has a tip incision width maintaining portion 8 and an intermediate incision portion 10, An intermediate assumed surface D passing through both end portions 19 of the intermediate boundary portion 9 between, and a base end assumed surface E passing through both end portions 30 of the intermediate boundary portion 11 between the intermediate incision portion 10 and the intermediate incision width maintaining portion 12; Is assumed.

  Both the blade edges 24 of the tip incision width maintaining portion 8 are extended on the assumed tip surface C and parallel to each other inside the range between the assumed tip surfaces C including the assumed tip surface C. . Therefore, the interval W24 (width dimension) between the two blade edges 24 of the tip incision width maintaining portion 8 is set equal to the interval W13 (width dimension) between both end portions 13 of the tip boundary portion 7. In that case, the tip assumed surface C and the intermediate assumed surface D coincide with each other.

  The entire cutting edge 29 of the intermediate incision part 10 is outside the intermediate assumed surface D including the intermediate assumed surface D, that is, between the two assumed tip surfaces C including the assumed tip surface C. On the outside that is not within the range, the cutting edge 3 is an effective cutting edge extending so as to gradually spread from the pointed end 4 side of the blade body 3 toward the base end 5 side of the blade plate 2. Therefore, the distance W29 (width dimension) between the blade edges 29 of the intermediate incision 10 is the distance W19 between both ends 19 of the intermediate boundary 9 between the intermediate incision 10 and the tip incision width maintaining part 8. It is set larger than (width dimension) and larger than the interval W13 (width dimension) between both end portions 13 of the tip boundary portion 7.

  Both intermediate outer end edges 31 of the intermediate incision width maintaining portion 12 have a blade plate 2 from the pointed end portion 4 side of the blade body portion 3 inside the range between the assumed base end surfaces E including the assumed base end surface E. Is extended to the base end 5 side. Therefore, the interval W31 (width dimension) between the intermediate outer end edges 31 of the intermediate incision width maintaining portion 12 is between the both end portions 30 of the intermediate boundary portion 11 between the intermediate incision width maintaining portion 12 and the intermediate incision portion 10. The intermediate outer end edges 31 of the intermediate incision width maintaining part 12 are set to be equal to the interval W30 (width dimension) of the intermediate incision width 12 or extend in parallel with each other, or both intermediate outer ends of the intermediate incision width maintaining part 12 The interval W31 (width dimension) between the edges 31 is set to be smaller than the interval W30 (width dimension) between both end portions 30 of the intermediate boundary portion 11. Incidentally, both the intermediate outer end edges 31 are extended from the both end portions 30 of the intermediate boundary portion 11 in parallel to each other by a little length, and then extended so as to narrow toward each other toward the base end portion 5 side.

  The cutting edge angle θ18 formed by intersecting the cutting edge assumption surfaces including both cutting edge edges 18 of the tip incision 6 and the cutting edge assumption plane including the cutting edges 29 of the intermediate cutting section 10 intersecting each other. The angle θ29 is set equal to each other. Therefore, a direction (from the pointed end 4 side of the blade body part 3 toward the base end part 5 side of the blade plate 2) of both the blade edge 18 of the tip incision 6 and the both edges 29 of the intermediate incision 10 ( A blade edge assumed surface including the blade edge 18 of the tip incision 6 adjacent to each other in the longitudinal direction of the blade plate 2 along the central partition line A and a blade edge assumed surface including the blade edge 29 of the intermediate incision 10 are parallel to each other. Is set to

  Incidentally, the cutting edge angles θ18 and θ29 are set in the range of 45 ° to 90 °, preferably in the range of 60 ° to 70 °, and actually about 66 °. The depth H from the tip 4 of the tip incision 6 to the intermediate boundary 11 is set in the range of 1 mm to 10 mm, and actually about 3.5 mm. The maximum width dimension of the blade body part 3 (width dimension W30 between both end parts 30 of the intermediate boundary part 11) is set to 6.0 mm or less, and preferably the width between both end parts 13 of the tip boundary part 7 The dimension W13 is set to 3.5 mm or less, actually about 2.65 mm, and the width dimension W30 between both end portions 30 of the intermediate boundary 11 is set to 5.0 mm or less, and actually set to about 3.75 mm. Has been. The thickness T is set in the range of 0.1 mm to 0.5 mm, and actually about 0.15 mm. In applications other than eye surgery, the depth H and the width dimension W13 are increased. For example, the depth H and the width dimension W13 may be set to about 50 mm.

  The outer shape of the blade body part 3 can be manufactured by various existing manufacturing methods such as press molding, forging, casting, and wire cutting. After the manufacture, the double-edged surface 17 of the distal incision 6, the dual-edged surface 23 of the distal incision width maintaining unit 8, and the dual-edged surface 28 of the intermediate incised part 10 are ground by, for example, one of the following procedures: . At that time, after each of the bladed surfaces 17, 23, 28 on both sides is ground on one of the bladed surfaces 17, 23, 28, the other bladed surfaces 17, 23, 28 may be ground. . About the material of this blade part 3, you may use titanium, diamond, ceramics, etc. other than stainless steel. The outer surface of the blade body 3 is coated with silicone to reduce frictional resistance, or the outer surface of the blade body 3 is coated with titanium nitride coating, hard diamond coating (DLC), or ceramic coating to provide cutting edge edges 18, 24, 29 can be strengthened and the frictional resistance can be reduced.

  The blade body portion 3 from the base end portion 5 side of the blade plate 2 in the order of the blade attachment surface 28 of the intermediate incision portion 10, the blade attachment surface 23 of the tip incision width maintaining portion 8, and the blade attachment surface 17 of the tip incision portion 6. Are continuously ground along the extending direction of the blade edges 29, 24, 18 toward the tip 4 side.

  The blade plate 2 from the pointed end 4 side of the blade body 3 in the order of the blade attachment surface 17 of the tip incision 6, the blade attachment surface 23 of the tip incision width maintaining portion 8, and the blade attachment surface 28 of the intermediate incision 10. Grinding continuously toward the base end 5 side along the extending direction of the blade edges 18, 24, 29.

  The blade from the proximal end 5 side of the blade plate 2 in the order of the blade attachment surface 28 of the intermediate incision portion 10, the blade attachment surface 23 of the distal incision width maintaining portion 8, and the blade attachment surface 17 of the distal incision portion 6, respectively. Grinding discontinuously from each other along the extending direction of the blade edges 29, 24, 18 toward the tip 4 of the body 3.

  A blade from the pointed end 4 side of the blade body 3 is separately provided in the order of the bladed surface 17 of the tip incision 6, the bladed surface 23 of the tip incision width maintaining unit 8, and the bladed surface 28 of the intermediate incision 10. Grinding is performed discontinuously with each other along the extending direction of the blade edges 18, 24, 29 toward the base end 5 side of the plate 2.

  First, the edge of the blade edge from the base end 5 side of the blade plate 2 to the pointed end 4 side of the blade body 3 in the order of the blade attaching surface 28 of the intermediate incision portion 10 and the blade attachment surface 23 of the distal incision width maintaining portion 8. 29 and 24 are continuously ground along the extending direction. Next, the blade attachment surface 17 of the distal incision 6 is discontinuously separate from the blade attachment surface 28 of the intermediate incision 10 and the blade attachment 23 of the distal incision width maintaining portion 8, and is on the base end 5 side of the blade plate 2. To the pointed end 4 side of the blade body part 3 along the extending direction of the blade edge 18.

  First, the cutting surface 17 of the tip incision part 6 is ground along the extending direction of the blade edge 18 from the pointed end 4 side of the blade body part 3 to the base end part 5 side of the blade plate 2. Next, the cutting edge portion 4 of the blade body 3 is discontinuous with the cutting edge 17 of the tip incision 6 in the order of the cutting edge 23 of the tip incision width maintaining portion 8 and the cutting edge 28 of the intermediate incision 10. Grinding is performed continuously from the side to the base end 5 side of the blade plate 2 along the extending direction of the blade edges 24 and 29.

  First, the edge of the blade edge from the base end 5 side of the blade plate 2 to the pointed end 4 side of the blade body 3 in the order of the blade attaching surface 28 of the intermediate incision portion 10 and the blade attachment surface 23 of the distal incision width maintaining portion 8. 29 and 24 are continuously ground along the extending direction. Next, the blade attachment surface 17 of the tip incision 6 is discontinuously separated from the blade attachment surface 28 of the intermediate incision 10 and the blade attachment surface 23 of the tip incision width maintaining portion 8, and is not continuous. To the base end 5 side of the blade plate 2 along the extending direction of the blade edge 18.

  In addition, after each of the blade attachment surfaces 17, 23, 28 is formed, each of the blade attachment surfaces 17, 23, 28 is subjected to chemical treatment or electrochemical treatment, whereby the respective blade edge 18, 18, 29. Can also be formed.

  The medical blade according to the first embodiment is used in the eye surgery and other eye surgery described in the prior art. In general, when the tip incision 6 is put on the eyeball in use, the blade body 3 is inserted in the longitudinal direction of the blade plate 2 and the tip incision 6 is pushed into the eyeball. A part of the eyeball is incised by the double edge 18. At that time, when the incision of the eyeball reaches from the front end incision 6 to the front end incision width maintaining section 8, it is possible to feel that the incision resistance has decreased and to stop the insertion of the blade body section 3, and at the front end incision 6 As a result, the incision width that can be incised is maximized, and the incision does not extend beyond the incision width. Thereafter, the blade body part 3 may be temporarily removed from the eyeball and inserted again, or the blade body part 3 may be continuously inserted. In any case, when the blade body portion 3 is inserted in the longitudinal direction of the blade plate 2 and the incision reaches the intermediate incision portion 10 from the tip incision width maintaining portion 8, the incision is made by the both blade leading edges 29 of the intermediate incision portion 10. Is further incised. At that time, when the incision reaches from the intermediate incision 10 to the intermediate incision width maintaining part 12, it can be felt that the incision resistance has decreased and the insertion of the blade body part 3 can be stopped. The possible incision width is maximized so that the incision does not extend beyond the incision width. Incidentally, since such eye surgery is performed using a microscope, the outer surface of the blade body portion 3 is subjected to an antireflection treatment such as roughing or covering treatment to prevent reflection of the blade body portion 3 due to illumination. It may be easy to perform eye surgery.

[Second Embodiment shown in FIG. 4]
This second embodiment is mainly different from the first embodiment in the following points *.
* The extension length of the two cutting edges 18 of the tip incision 6 is the same as that of the first embodiment, and the extension length of the two edges 24 of the tip incision width maintaining section 8 is made larger than that of the first embodiment. The extending length of the two blade edges 29 of the intermediate incision 10 is made smaller than that of the first embodiment. In addition, the extending length of each blade edge 18, 24, 29 may be variously changed.

  * The specific incision width between the blade edges 18 of the tip incision 6 (for example, the width W13 between both ends 13 of the tip boundary 7) is displayed as an actual dimension of 2.65 mm, and the intermediate incision 10 An incision width display portion 34 for displaying a specific incision width between the two blade edges 29 (for example, a width dimension W30 between both end portions 30 of the intermediate boundary portion 11) as 3.2 mm is an intermediate incision of the blade body portion 3. This is clearly shown in the vicinity of the intermediate surface 32 of the width maintaining portion 12. These actual dimensions can be applied by etching, printing, stamping by pressing, laser marking, or the like.

  In the vicinity of the central zone screen B at the tip boundary 7, a mark 35 is provided on the tip surface 15 at a distance from the double-edged surface 17 of the tip incision 6. In the vicinity of the screen B, a mark 36 is attached to the intermediate surface 26 with a space from the double-edged surface 28 of the intermediate incision 10. These marks 35, 36 are not formed on the double-edged surface 17 of the tip incision 6 and the dual-edged surface 28 of the intermediate incised part 10, but may be formed between the dual-edged surfaces 17 and between the dual-edged surfaces 28. preferable. When the incision width assumption surface F passing through the mark 35 on the tip surface 15 intersects the both cutting edges 18 of the tip incision section 6, the intersection (end portion 13) between the incision width assumption surface F and the both cutting edges 18 The space between them (width dimension W13) is set to the specific incision width (2.65 mm) between the two blade edges 18 of the tip incision 6. When the incision width assumption plane G passing through the mark 36 of the intermediate surface 26 intersects the both cutting edges 29 of the intermediate incision 10, the intersection (end 30) between the incision width assumption plane G and the both cutting edges 29 is obtained. The space between them (width dimension W30) is set to the specific incision width (3.2 mm) between the blade edges 29 of the intermediate incision 10. The marks 35 and 36 may be provided at a position other than the tip boundary portion 7 and the intermediate boundary portion 11, and in that case, the incision width assumption surface F is a double-edged blade between the tip portion 4 and the end portion 13. It intersects with the leading edge 18, and the incision width assumption surface G intersects the both-blade leading edge 29 between the end portion 19 and the end portion 30. These marks 35 and 36 can be attached by etching, printing, stamping by pressing, laser marking, or the like.

Incidentally, the actual dimensions and marks 35 and 36 are also means for facilitating eye surgery using a microscope.
[Third embodiment shown in FIG. 5]
The third embodiment is mainly different from the second embodiment in the following points.

  In the tip incision width maintaining portion 8, both intermediate outer end edges 20 have no cutting edge, and the interval W20 (width dimension) between both intermediate outer end edges 20 of the tip incision width maintaining portion 8 is the both ends of the tip boundary portion 7. 13 is set to be smaller than the interval W13 (width dimension) between 13 and gradually narrows from the pointed end 4 side of the blade body part 3 toward the base end part 5 side of the blade plate 2 inside the range between the two assumed tip surfaces C. It is extended to be able to. In addition, the form of the blade body part 3 is changed, such as the extended length of the two cutting edge edges 18 of the tip incision 6 and the extended length of the two cutting edges 29 of the intermediate incision 10. The shapes of the marks 35 and 36 are changed, and the display of the incision width display unit 34 is omitted. Further, both intermediate outer edges 20 of the tip incision width maintaining portion 8 may be recessed inwardly in a V shape or a curved shape.

[Fourth embodiment shown in FIG. 6]
The fourth embodiment is mainly different from the first embodiment in the following points.
In the tip incision 6, both cutting edges 18 are recessed inwardly with respect to the assumed cutting edge I connecting the tip 4 and both ends 13 of the tip boundary 7. In addition, both the cutting edges 18 of the tip incision 6 are recessed inwardly with respect to the cutting edge assumed surface I, or both the cutting edges 18 of the tip incision 6 are V-shaped outward with respect to the cutting edge assumed surface I. You may inflate in the shape of a curve. Further, both the blade edges 29 of the intermediate incision 10 may be recessed inwardly in a V shape or a curved shape, or may be expanded outwardly in a V shape or a curved shape.

[Fifth embodiment shown in FIG. 7]
The fifth embodiment is mainly different from the third embodiment in the following points.
The blade body part 3 of the fifth embodiment has a form obtained by cutting the blade body part 3 of the third embodiment on the central section screen B. Therefore, in the third embodiment, one of the two assumed tip surfaces C, one of the intermediate assumed surfaces D, and one of the two proximal assumed surfaces E are respectively in the central area. It coincides with the screen B, the distal outer edge 14 of the distal incision 6 is on the assumed distal surface C, the intermediate outer edge 20 of the distal incision width maintaining unit 8 is on the intermediate assumed surface D, and the middle of the intermediate incision 10. Outer edge 25 is formed on base end assumption surface E, respectively.

[Sixth embodiment shown in FIG. 8]
The sixth embodiment differs from the second embodiment shown in FIG. 4 in that characters such as kanji and katakana are used as the marks 35 and 36.

(A) is a front view which shows the medical blade concerning 1st Embodiment, (b) It is a fragmentary perspective view which shows the blade body part of the medical blade, (c) is sectional drawing of the blade body part It is. (A) (b) (c) is a partial top view which shows a blade part in the conventional medical blade. (A) is a partial top view which shows a blade part in the medical blade concerning 1st Embodiment, (b) is a partial bottom view similarly. It is a fragmentary top view which shows a blade body part in the medical blade concerning 2nd Embodiment. It is a fragmentary top view which shows a blade body part in the medical cutter concerning 3rd Embodiment. It is a fragmentary top view which shows a blade body part in the medical blade concerning 4th Embodiment. It is a fragmentary top view which shows a blade body part in the medical blade concerning 5th Embodiment. It is a fragmentary top view which shows a blade body part in the medical blade concerning 6th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Blade body part, 4 ... Point part (tip part), 5 ... Base end part, 6 ... Tip incision part, 7 ... Tip boundary part, 8 ... Tip incision width maintenance part, 9 ... Middle boundary part, 10 ... Middle Incision part, 11 ... intermediate boundary part, 12 ... intermediate incision width maintaining part, 13 ... both ends of the tip boundary part, 14 ... outer end edges of the distal incision part, 15 ... tip surface of the distal incision part (first tip) Surface), 16 ... the tip back surface (second tip surface) of the tip incision part, 18 ... both edge edges of the tip incision part, 19 ... both ends of the intermediate boundary part, 20 ... both intermediate outer edges of the tip incision width maintaining part , 21 ... intermediate surface (first intermediate surface) of the tip incision width maintaining portion, 22 ... intermediate back surface (second intermediate surface) of the tip incision width maintaining portion, 25 ... both intermediate outer edges of the intermediate incision portion, 26 ... intermediate Intermediate surface of the incision (first intermediate surface), 27 ... Intermediate back of the intermediate incision (second intermediate surface), 29 ... Both edges of the intermediate incision, 30 ... Intermediate boundary Both ends, 31 ... both intermediate outer edges of the intermediate incision width maintaining portion, 32 ... intermediate surface of the intermediate incision width maintaining portion (first intermediate surface), 33 ... intermediate back surface of the intermediate incision width maintaining portion (second intermediate surface) , 34 ... incision width display section, 35 ... mark, 36 ... mark, A ... center section line, B ... center section screen, C ... assumed tip plane, D ... intermediate assumed plane, E ... proximal end assumed plane, F ... incision Width assumed plane, G ... cutting width assumed plane, θ18, θ29 ... blade angle, W13 ... interval (specific incision width), W19, W24, W29, W31 ... interval, W30 ... interval (specific incision width).

Claims (9)

The blade body portion includes a distal incision portion extending from the distal end portion toward the proximal end portion, a distal incision width maintaining portion extending from the distal boundary portion with the distal incision portion toward the proximal end portion side of the blade body portion, and the distal incision portion. An intermediate incision portion extending from the intermediate boundary portion with the width maintaining portion to the base end side of the blade body portion,
In the front end incision portion, a front end outer edge extends from the front end portion of the blade body portion to both ends of the front end boundary portion, and a first front end surface is defined between both front end outer end edges of the front end incision portion; Providing a second tip surface, forming a blade edge on at least one tip outer edge of both tip outer edges of the tip incision,
In the distal incision width maintaining part, an intermediate outer edge is extended from both ends of the distal boundary part to the proximal end side of the blade body part, and is defined between both intermediate outer edges of the distal incision width maintaining part. Providing a first intermediate surface and a second intermediate surface,
In the intermediate incision portion, an intermediate outer end edge is extended from both ends of the intermediate boundary portion between the intermediate incision portion and the distal incision width maintaining portion to the base end portion side of the blade body portion, and the intermediate incision portion. Providing a first intermediate surface and a second intermediate surface partitioned between both intermediate outer end edges, and forming a cutting edge on at least one intermediate outer end edge of both intermediate outer end edges of the intermediate incision,
Whether the distance between both intermediate outer edges of the distal incision width maintaining part is set equal to the distance between both ends of the distal boundary part, and both intermediate outer edges of the distal incision width maintaining part are extended in parallel with each other Alternatively, both intermediate outer edges of the tip incision width maintaining part are extended so that the distance between both outer outer edges of the tip incision width maintaining part is set smaller than the distance between both ends of the tip boundary part. And
An interval between both intermediate outer edges of the intermediate incision portion is set to be larger than an interval between both ends of the intermediate boundary portion between the intermediate incision portion and the tip incision width maintaining portion. The outer end edge is extended so as to gradually expand toward the base end side of the blade body part, and both intermediate outer end edges of the intermediate incision part have a larger interval than the interval between both end parts of the tip boundary part. A medical blade characterized by including an effective outer edge. The blade body portion includes a distal incision portion extending from the distal end portion toward the proximal end portion, a distal incision width maintaining portion extending from the distal boundary portion with the distal incision portion toward the proximal end portion side of the blade body portion, and the distal incision portion. An intermediate incision portion extending from the intermediate boundary portion with the width maintaining portion to the base end side of the blade body portion,
In the front end incision portion, a front end outer edge extends from the front end portion of the blade body portion to both ends of the front end boundary portion, and a first front end surface is defined between both front end outer end edges of the front end incision portion; Providing a second tip surface, forming a blade edge on at least one tip outer edge of both tip outer edges of the tip incision,
In the distal incision width maintaining part, an intermediate outer edge is extended from both ends of the distal boundary part to the proximal end side of the blade body part, and is defined between both intermediate outer edges of the distal incision width maintaining part. Providing a first intermediate surface and a second intermediate surface,
In the intermediate incision portion, an intermediate outer end edge is extended from both ends of the intermediate boundary portion between the intermediate incision portion and the distal incision width maintaining portion to the base end portion side of the blade body portion, and the intermediate incision portion. Providing a first intermediate surface and a second intermediate surface partitioned between both intermediate outer end edges, and forming a cutting edge on at least one intermediate outer end edge of both intermediate outer end edges of the intermediate incision,
It is parallel to the section screen including a partition line that passes through the distal end portion of the blade body portion and intersects the distal boundary portion and also intersects the intermediate boundary portion between the distal incision width maintaining portion and the intermediate incision portion, and the distal boundary portion Extend both intermediate outer edges of the tip incision width maintaining part inside the range between the two assumed tip surfaces including the assumed tip surface passing through both ends,
The tip incision width is maintained in parallel to the section screen including a section line that passes through the tip of the blade body and intersects the tip boundary and also intersects the intermediate boundary between the tip incision width maintaining portion and the intermediate incision portion. The intermediate outer edges of the intermediate incision part are gradually widened toward the base end part side of the blade body part outside the assumed inter-plane range passing through both ends of the intermediate boundary part between the intermediate part and the intermediate incision part. The intermediate outer edge of the intermediate incision part is an effective outer edge extending so as to gradually spread toward the base end side of the blade body part outside the range between the two leading edges. A medical blade characterized by having. In addition to the distal incision, the distal incision width maintaining portion, and the intermediate incision portion, the blade body portion includes an intermediate incision width maintaining portion that extends from an intermediate boundary portion with the intermediate incision portion to the proximal end side of the blade body portion. In the intermediate incision width maintaining portion, the intermediate outer edge extends from the both ends of the intermediate boundary portion between the intermediate incision width maintaining portion and the intermediate incision portion to the base end portion side of the blade body portion. A first intermediate surface and a second intermediate surface defined between both intermediate outer edges of the intermediate incision width maintaining portion;
The intermediate incision width maintaining part is set so that the distance between both intermediate outer edges of the intermediate incision width maintaining part is equal to the distance between both ends of the intermediate boundary between the intermediate incision width maintaining part and the intermediate incision part. The intermediate outer edges of the intermediate incision width maintaining portion are extended in parallel with each other, or the interval between the intermediate outer end edges of the intermediate incision width maintaining portion is set to the intermediate boundary portion between the intermediate incision width maintaining portion and the intermediate incising portion. Extend both intermediate outer edges of this intermediate incision width maintaining part so as to be set smaller than the distance between both ends of the
Or the intermediate boundary part between the front incision width maintaining part and the intermediate incision part and the intermediate boundary part between the intermediate incision part and the intermediate incision width maintaining part through the front end part of the blade body part and intersecting the front end boundary part In addition, the range between the base end assumed planes including the base end assumed plane that is parallel to the section screen including the partition line that also intersects and that passes through both ends of the intermediate boundary between the intermediate incision part and the intermediate incision width maintaining part. The medical blade according to claim 1 or 2, wherein both intermediate outer end edges of the intermediate incision width maintaining portion are extended inside. The blade edge is formed at each outer edge of both ends of the distal incision, and the blade edge is formed at both intermediate outer edges of the intermediate incision, respectively. 3. The medical knife according to 3. The medical blade according to claim 4, wherein a blade edge is formed on each of the intermediate outer edges of the tip incision width maintaining portion. The cutting edge angle formed by intersecting the cutting edges including the cutting edges at both outer edges of the leading end incision and the cutting edges including the cutting edges at both intermediate outer edges of the intermediate cutting section intersect each other. 6. The medical blade according to claim 4 or 5, wherein the edge angles of the edges are set equal to each other. A blade edge assumed surface including a blade edge at both outer end edges of the tip incision portion and a blade edge assumed surface including a blade edge at both intermediate outer edge edges of the intermediate incision portion are set in parallel to each other. The medical blade according to claim 4 or 5. An incision width display portion that displays the actual size of the specific incision width between the cutting edge edges at both outer end edges of the front end incision portion, and a specific incision width between the cutting edge edges at both intermediate outer end edges of the intermediate incision portion. The medical cutting tool according to any one of claims 4 to 7, further comprising an incision width display portion for displaying dimensions. When the incision width assumption surface passing through the mark attached to the specific incision depth portion from the tip portion at the tip incision portion intersects the blade edge at the both outer edges of the tip incision portion, the incision width assumption surface and The interval between the intersections with both blade edges is set to a specific incision width between the blade edges at both outer edges of the tip incision, and a specific incision depth from the tip of the tip incision at the intermediate incision When the incision width assumption surface passing through the mark attached to the portion intersects with the blade edge at both intermediate outer end edges of the intermediate incision portion, the interval between the intersection between the incision width assumption surface and the both blade edge is set to the intermediate incision portion. The medical blade according to any one of claims 4 to 8, wherein a specific incision width between the blade edges at both intermediate outer edges is set.

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