HK1176268B - Medical stapler and magazine - Google Patents

Description

Medical stapler and magazine

Technical Field

The present invention relates to a medical stapler and a magazine thereof, and more particularly, to a medical stapler and a magazine thereof which can prevent clogging (clogging) of staples and can be manufactured at low cost.

Background

As a conventional medical stapler, a medical stapler shown in fig. 4 to 6 described in patent document 1 is known. Fig. 4 is three views of the medical stapler, wherein (a) is a plan view, (b) is a side sectional view, and (c) is a front view. Fig. 5 (a) to (c) are views illustrating a procedure of forming the staples. Fig. 6 is a view showing staples housed in the cartridge, where (a) is a side view and (b) is an I-I sectional view of (a). The outline is explained below.

The medical stapler 10' shown in fig. 4 is composed of the following components: a housing 1; a handle 2 rotatably mounted to the housing 1; and a magazine 4 detachably mounted to the housing 1 and housing the plurality of staples 3. The cartridge 4 has: a guide rail 5 fixed inside the magazine 4; an anvil 5a formed by tapering and bending the tip of the guide rail 5; a ram 6 configured to advance and retreat toward an end position of the anvil 5 a; and a biasing member 7 that biases the ram 6 in a direction away from the end of the anvil 5 a. The rail 5 has a mid-height structure having a high center and bases on both sides, and a predetermined number of staples 3 are arranged on the rail 5 so as to straddle the mid-height portion of the rail 5, and both legs of the staples 3 are placed on the bases on both sides of the rail 5. These staples 3 are urged toward the anvil 5a at the end of the guide rail 5 by the elastic member 8.

The housing 1 and the handle 2 are made of synthetic resin such as ABS resin, and are formed in shapes in consideration of ease of gripping and operability.

The magazine 4 is formed separately from the housing 1, and the handle 2 and the housing 1 are attached to the magazine 4 to form the medical stapler 10'. The magazine 4 is integrally molded from a transparent ABS resin, and the remaining number of the received staples 3 can be confirmed from the outside.

The staples 3 are stored in a storage space in the magazine 4 in a predetermined number of rows and are placed on the guide rails 5. The staple 3 is formed by bending a stainless steel circular wire into an コ shape, and as shown in fig. 5 (a), both end portions of the staple 3 are formed into leg portions 3a, and the leg portions 3a are formed into a sharp shape so as to reduce resistance when piercing a living tissue. The portion connecting the both legs 3a, 3a is referred to as a crown 3b, and the crown 3b is a portion bent at the time of suturing the living tissue. As shown in fig. 6 (a), the staples 3 are stored such that the leg portions 3a are inclined forward in the traveling direction and the crown 3b is inclined rearward in the traveling direction. The inclination angle alpha is 45-60 degrees, and the anastomat can be miniaturized through the inclination.

The length of the crown 3b of the staple 3 is referred to herein as the width of the staple.

Fig. 5 is a view illustrating a sequence of forming staples 3 for closing a wound. The stapler 10' is primarily used to suture wounds on a body surface. When the distal end of the stapler 10' is brought into close contact with the affected part and the handle 2 shown in fig. 4 (b) is urged to rotate in the direction a, the pusher 6 is driven by the handle 2 to descend, and finally, as shown in fig. 5 (a), the distal end of the pusher 6 comes into contact with the crown 3b of the staple 3. When the ram 6 further continues to descend, the crown 3b is bent into a curved shape as shown in fig. 5 (b). At this time, the foot 3a pierces the skin. When the ram 6 is further lowered, as shown in fig. 5 (c), the crown 3b is bent at a right angle by both ends of the anvil 5a, the foot 3a comes to be parallel to the anvil 5a in the body tissue under the wound, the staple 3 is bent into a quadrangular shape, and one stapling is completed. At this time, only the central portion of the crown 3b is exposed from the skin, and the other three sides of the quadrangle are buried in the body tissue. The width dimension of the anvil 5a corresponds to the lateral dimension of the quadrangle formed when the staples 3 are formed.

After the force applied to the handle 2 is removed, the handle 2 is rotated in the direction b of fig. 4 (b) by the biasing force of the biasing member 7, and the ram 6 is raised and returned to the initial position. Thereafter, the above-described operation is repeated to feed the staples 3 one by one, thereby repeating the stapling.

Fig. 6 is a view showing staples 3 accommodated in cartridge 4, where (a) is a side view and (b) is an I-I sectional view of (a).

A plurality of staples 3 are arranged side by side on the guide rail 5, and the plurality of staples 3 are pushed out toward the anvil 5a by the elastic member 8. As described above, the staple 3 is inclined such that the leg portion 3a is located forward in the advancing direction and the crown 3a is located rearward in the advancing direction, and the inclination angle α in the drawing is an angle of 45 ° to 60 °. As shown in fig. 6 (b), the staple housing space 9 of the magazine 4 is defined in the width direction by the left and right walls 4a, 4b in the traveling direction and in the vertical direction by the top wall 4c and the upper surface of the base of the guide rail 5. If there is no gap in the width (left-right) direction and the vertical direction between the top wall and the staples 3, the staples 3 cannot travel in the housing space 9, and the stapler cannot be used.

Therefore, it is necessary to ensure appropriate gaps in the width direction and the vertical direction, and to ensure the movement of the staples 3. The staples 3 are formed by bending a round bar, and the staples 3 are separated from each other and are not loosely coupled together in a large number of staples as in the case of staples for stationery. Therefore, the staples 3 are placed on the base portion of the guide rail 5 and cannot move downward, but can move upward and in the left-right direction. Therefore, there are the following problems: if the gap with the left and right walls 4a and 4b is too large, when the adjacent staples 3 are pushed by the elastic member 8 while being laterally offset, the staples 3 are pushed and moved in the direction of the left and right walls 4a and 4b orthogonal to the advancing direction, and are strongly pushed against the walls 4a and 4b to be unable to advance and cause a jam (hereinafter, referred to as "jam"), and the medical stapler 10 becomes unusable.

As described above, the staples 3 are inclined at the inclination angle α in the housing space 9, and when the travel is not smoothly performed, the staples 3 stand up and the inclination angle α increases. At this time, the tip of the sharp leg 3a bites the surface of the guide rail 5, and still causes a jam.

As a technique for achieving stable feeding of staples, patent document 2 proposes twisting a pair of legs of a staple relative to each other. By applying the twist, the twisted state can be controlled, and smooth feeding of staples can be realized. However, this structure cannot solve the problem of clogging due to a gap in the housing space and the problem of clogging due to the snap-in.

The conventional magazine 4 is an integral structure formed by injection molding of synthetic resin, and requires a space for accommodating the guide rail 5 and the staples 3, a space for accommodating the ram 6 and the biasing member 7, and the like, and is formed in a complicated shape. Therefore, the structure of the mold becomes very complicated, and there is a problem that the manufacturing cost of the magazine is increased.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2006 and 305136

Patent document 2: japanese laid-open patent publication No. 2009-131345

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above-described problems, and a first object of the present invention is to provide a medical stapler and a magazine thereof capable of preventing clogging of staples in the magazine of the medical stapler. A second object of the present invention is to provide a medical stapler and a magazine thereof, which can reduce manufacturing costs.

Means for solving the problems

In order to achieve the first object, a cartridge used in a medical stapler according to the present invention is a cartridge for storing a plurality of コ -shaped medical staples and a rail on which the staples are placed, and the cartridge is characterized in that a width dimension of a space for storing the staples in the cartridge is larger than a width of the staples and smaller than a value obtained by adding 1/2, which is a diameter of the staples, to the width of the staples.

The following structure may be formed: the hardness of the guide rail is higher than that of the anastomosis nail; receiving the コ -shaped medical staple with the leg portion of the staple inclined forward in the direction of travel and the body portion of the コ -shaped staple inclined rearward in the direction of travel; the width dimension of the space for receiving the staples is larger than the width of the staples, and is equal to or smaller than a value obtained by adding 1/3 to the width of the staples and the diameter of the staples.

In order to achieve the second object, a magazine used in a medical stapler according to the present invention is characterized in that, in the above configuration, the magazine is formed of a half-divided body formed in a half-divided manner so as to sandwich a guide rail on both sides along a longitudinal direction of the guide rail. The positioning protrusion is provided on one of the half-divided bodies, the positioning protrusion is fitted into the recess of the other half-divided body, the guide rail is provided with a positioning portion for determining a position of the guide rail, the half-divided body is provided with a receiving portion for fitting into the positioning portion, the one half-divided body is provided with a locking portion for holding the fitting into the other half-divided body, and the other half-divided body is provided with a locked portion for engaging with the locking portion.

Further, the guide rail may be provided with engagement holding portions for holding engagement with the half bodies on both sides, and the half bodies on both sides may be provided with engagement receiving portions that engage with the engagement holding portions to hold engagement of the half bodies.

The medical stapler according to the present invention is characterized in that the half-divided body of any of the above-described staple cartridges is attached to the main body so as to be biased in a direction of being closely attached to each other from both sides.

Effects of the invention

By making the width of the staple storage space for storing the staples in the magazine larger than the width of the staples, the staples can be smoothly moved in the magazine. Further, by making the width of the housing space smaller than the value obtained by adding 1/2 to the width of the staple, the range in which the staple can move in the width direction of the housing space in the housing space is limited, and if the deviation is within the limited range, the force pushing out the staple can exceed the force moving the staple in the width direction of the housing space, and the staple can be pushed in the advancing direction, and the jam can be prevented.

Further, by making the hardness of the guide rail higher than that of the staples, even if the inclination of the staples becomes steep, the tips of the staples do not bite the guide rail, and the jamming can be prevented.

By forming the magazine in a half-divided structure, the structure of the mold for molding the magazine can be formed simply, and the manufacturing cost of the magazine can be reduced. Further, the positioning in the width direction, the length direction, and the height direction of the guide rail can be simplified by the structure of the positioning portion and the receiving portion, and the magazine can be easily assembled. Meanwhile, by clamping the guide rail from both sides using the half split bodies, the width of the receiving space of the staples formed between the half split bodies can be accurately determined. Further, since the engaging portion for holding the engagement with the other half-divided body is provided in one half-divided body and the engaged portion for engaging with the engaging portion is provided in the other half-divided body, the magazine can be prevented from being disassembled after the assembly. Further, according to the half-split structure of the magazine of the present invention, by configuring the width of the housing space to be smaller than the value obtained by adding 1/2 to the diameter of the staple to the width of the staple as described above, even in the case of the half-split structure, the dimensional accuracy can be improved as well as in the case of the integrally formed structure, and a stapler which is not easily clogged can be provided.

Drawings

Fig. 1 is a main part sectional view of a medical stapler of the present invention.

Fig. 2 is a bottom view of the magazine, (a) shows an assembled state, and (b) shows an exploded state.

Fig. 3 is a main portion sectional view of the stapler of the present invention.

Fig. 4 is a three-dimensional view of a conventional medical stapler, in which (a) is a plan view, (b) is a side sectional view, and (c) is a front view.

Fig. 5 (a) to (c) are views for explaining a procedure of forming staples.

Fig. 6 is a view showing staples housed in the cartridge, where (a) is a side view and (b) is an I-I sectional view of (a).

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a main part sectional view of a medical stapler 10 of the present invention. Fig. 2 is a bottom view of the magazine 40, and (a) shows an assembled state, and (b) shows an exploded state. The same reference numerals as in the conventional example denote the same configurations as in the conventional example.

The magazine 40 for the medical stapler 10 according to the present invention is divided into two sides so as to sandwich the guide rail 5 in the longitudinal direction of the guide rail. One of the divided magazine 40 is a half-divided body 41, and the other is a half-divided body 42. In the case of such a division into the half-divided bodies 41 and 42, a method of bonding and integrating them with an adhesive is conceivable, but this structure is not adopted in the present invention. The reason for this is that, when an adhesive is used, it is difficult to control the amount of the adhesive. That is, if the amount of the adhesive is small, the adhesive may be peeled off after the bonding. Conversely, if the adhesive is too much, the adhesive may adhere to the staples 3, thereby affecting the human body. In the present invention, as explained below, a bonding method which does not have such a problem is employed.

In the two half bodies 41 and 42, a positioning protrusion 41a is formed on one half body 41, and a recess 42a into which the positioning protrusion 41a is fitted is formed on the other half body 42. As shown in fig. 2, a plurality of positioning projections 41a and a plurality of positioning recesses 42a (three in fig. 2) are provided, and positioning can be achieved when the two half-divided bodies 41 and 42 are joined. In addition, in the vicinity of one end of the split halves 41 and 42, one split half 41 has a flexible arm-shaped engaging portion 41b, and the other split half 42 has a similar flexible arm-shaped engaged portion 42b, and the projections of the engaging portion 41b are fitted into the holes of the engaged portion 42b, so that the split halves 41 and 42 are not easily separated after being coupled.

As shown in fig. 2 (b), the guide rail 5 has two pairs of projecting positioning portions 5b, and a pair of hook-shaped engaging and holding portions 5d are symmetrically formed on both sides of one end side of the guide rail 5. The guide rail 5 is attached to a predetermined position of the half bodies 41 and 42 by fitting the projecting positioning portions 5b and 5b into the recessed receiving portions 41c and 42c formed in the half bodies 41 and 42. With this configuration, the guide rail can be easily positioned in the width direction, the length direction, and the height direction, and the dimensional accuracy can be improved. The hook-shaped engagement holding portions 5d engage with engagement receiving portions 41d, 42d formed on the half bodies 41, 42. In the present embodiment, two pairs of projecting positioning portions 5b are provided, but a pair may be provided. When a pair is provided, if it is formed on the distal end side (anvil 5a side) of the guide rail 5, the overall balance is good.

The assembly of the magazine 40 is performed as follows. However, the following is merely an example, and is not limited to this assembly method.

First, as shown in fig. 2 (b), the guide rail 5 is placed in the middle of the half bodies 41, 42. Next, the positioning portions 5b and 5b of the guide rail 5 are fitted into the concave receiving portions 41c and 42c formed in either of the half bodies 41 and 42. At the same time, the hook-shaped engagement holding portion 5d is hooked on the engagement receiving portion 41d or 42d of the half-divided body 41 or 42 in which one of the positioning portions 5b and 5b is fitted. This causes the guide rail 5 to engage with the one half segment 41 or 42.

Next, the half bodies 41 or 42 that are not engaged are engaged with the opposite side to the engagement of the guide rail 5. At this time, the positioning portions 5b and 5b of the guide rail 5 are fitted into the concave receiving portions 41c and 42c of the half-divided body, the hook-shaped engagement holding portion 5d of the guide rail 5 is engaged with the engagement receiving portion 41d and 42d formed in the half-divided body 41 and 42, and the positioning protrusion 41a of the half-divided body 41 is fitted into the concave portion 42a of the half-divided body 42. When half-segments 41 and 42 are thus joined, cartridge 40 is assembled, and thereafter, separation of half-segments 41 and 42 can be prevented.

The magazine 40 assembled in this manner is formed with a housing space 9 for housing the staples 3 and a space into which the press head 6, not shown, is inserted, and the housing space 9 is opened at the rear end of the magazine 40. A predetermined number of staples 3 are inserted through the opening, and the pushing member and the elastic member 8 are inserted from the rear side (see fig. 4). Further, although not shown, a space for housing the ram 6 is opened above the magazine 40, and the ram 6 and the biasing member 7 are attached thereto to complete the magazine 40.

After cartridge 40 is assembled, handle 2 is attached, and then housing 1 is attached. The handle 2 is rotatably attached by fitting the shaft 2a into an attachment hole formed in the magazine 40. Housing 1 is attached by fitting protruding attached portions 41g and 42g formed in magazine 40 to recessed attachment portion 1a formed in housing 1. By fitting the mounting portion 1a to the mounted portions 41g and 42g, the half-divided body of the magazine 40 is attached to the housing 1 (main body) so as to be biased from both sides in a direction of being in close contact with each other by the elasticity of the housing 1, and the coupling of the magazine 40 to the housing 1 is a coupling that does not easily come off. The assembly of the medical stapler 10 is completed in this way. The method of use is the same as that described in the conventional example.

Fig. 3 is a sectional view of a main part of the magazine 40 of the present invention, and is a view of the same portion as fig. 6 (b) described in the conventional example. The same reference numerals denote the same configurations as in the conventional example.

The staples 3 are accommodated in the accommodating space 9 of the magazine 40, and the accommodating space 9 is a space in which: the left-right direction of the traveling direction of staples 3 is defined by wall 41e of half-divided body 41 and wall 42e of half-divided body 42, below by the base of rail 5, and above by top walls 41f and 42f of half-divided bodies 41, 42.

In the present invention, the following features are provided: if the gap between the left and right walls 41e and 42e of the magazine 40 and the leg portion 3a of the staple 3 is s, a gap of s/2 exists on one side, and if the linear diameter of the staple 3 is d, a relationship of 0< s < d/2 is established. The width of the housing space 9 is determined by the abutment of the positioning portions 5b, 5b of the guide rail 5 and the concave receiving portions 41c, 42c of the half-divided body, thereby securing the above-described configuration. Further, if the value of s obtained by adding the gaps on both sides is smaller than 1/2 of the line diameter d of the staple 3, even when the maximum deviation occurs in which one of the adjacent staples 3 is in close contact with the wall 41e of the housing space 9 and the other staple 3 is in close contact with the wall 42e on the opposite side, the force pressing in the advancing direction by the elastic member 8 can exceed the force pressing the staple 3 against the wall 41e or the wall 42e, and the staple 3 can be advanced without being clogged.

Even if the gap s is smaller than d/2, the force pressing the staple 3 against the wall 41e or 42e is still large if d/3 is exceeded, and therefore the value of the gap s is preferably d/3 or less. This is because, to this extent, the force with which staples 3 are pressed against walls 41e or 42e of cartridge 40 is sufficiently reduced, eliminating the possibility of jamming.

Furthermore, the height-wise positioning of the guide rail is also important in order to prevent jamming. This is also ensured by the abutting of the positioning portions 5b, 5b of the guide rail 5 and the concave receiving portions 41c, 42c of the half-divided bodies, similarly to the positioning in the width direction.

Further, since an appropriate gap is also present between the staple 3 and the top walls 41f and 42f, the staple 3 may rise in a direction in which the inclination angle increases. In this case, the leg portion 3a conventionally bites into the guide rail 5, which causes a jam. In contrast, in the present application, the hardness of the guide rail 5 is set to be harder than the hardness of the staples 3. With such a configuration, the staples 3 can be prevented from biting into the rail 5, and clogging can be prevented. Further, by forming the staples 3 in a structure that is not easily raised, clogging can be reliably prevented. Therefore, the height dimension of the housing space 9 as the staples 3 is preferably formed to be smaller than a value obtained by adding 1/2 of the diameter of the staples 3 to the height of the staples 3 (the height to the upper surface of the crown 3 b) in the case where the assumed maximum inclination angle of the staples 3 is 60 °. With such a configuration, the force for pushing out the staples exceeds the force for moving the staples in the height direction of the housing space, so that the staples can be pushed in the advancing direction, and jamming can be prevented.

In this way, by using the cartridge having the half-split structure described above and by configuring the width of the housing space to be smaller than the width of the staple plus 1/2, which is the diameter of the staple, with the half-split structure, it is possible to reduce the manufacturing cost, and even with the half-split structure, it is possible to form the dimensional accuracy to be good as in the case of the integrally formed structure, and it is possible to provide a stapler which is not easily clogged.

Description of the reference symbols

1: a housing;

2: a handle;

3: anastomosis nails;

3 a: a foot portion;

5: a guide rail;

5 a: an anvil block;

5 b: a positioning part;

5 d: a snap-in holding portion;

6: a pressure head;

9: a storage space;

10: a medical stapler;

40: a staple cartridge;

41: a semi-divided body;

41 a: a positioning projection;

41 b: a card-holding section;

41 c: a receiving part;

41 d: a fastening receiving part;

41 e: a wall;

41 f: a top wall;

41 g: an installed part;

42: a semi-divided body;

42 a: a recess;

42 b: an engaged part;

42 c: a receiving part;

42 d: a fastening receiving part;

42 e: a wall;

42 f: a top wall.

Claims (3)

1. A magazine for storing a plurality of U-shaped medical staples and a rail on which the staples are placed, characterized in that a width dimension of a space of the magazine for storing the staples is larger than a width of the staples and smaller than a value obtained by adding 1/2 a diameter of the staples to the width of the staples,

the magazine is formed of a half-divided body that is formed in a half-divided manner so as to sandwich the guide rail on both sides in the longitudinal direction of the guide rail,

the positioning device is characterized in that a positioning protrusion is provided on one of the half-divided bodies, a recess into which the positioning protrusion is fitted is formed on the other of the half-divided bodies, a positioning portion for determining a position of the guide rail is formed on the guide rail, a receiving portion for fitting with the positioning portion is formed on the half-divided body, a locking portion for holding the fitting with the other half-divided body is provided on the one of the half-divided bodies, and a locked portion for engaging with the locking portion is provided on the other half-divided body.

2. The staple cartridge of claim 1, wherein the rails have a higher stiffness than the staples.

3. A medical stapler, characterized in that the half-divided body of the staple cartridge according to claim 1 or 2 is attached to a main body so as to be biased from both sides in a direction of being closely attached to each other.