CN119818152B - Tissue resection part, tissue resection instrument and processing method - Google Patents
Tissue resection part, tissue resection instrument and processing methodInfo
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- CN119818152B CN119818152B CN202510317686.5A CN202510317686A CN119818152B CN 119818152 B CN119818152 B CN 119818152B CN 202510317686 A CN202510317686 A CN 202510317686A CN 119818152 B CN119818152 B CN 119818152B
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Abstract
The present disclosure provides a tissue removal section for use with a tissue removal instrument. The tissue resecting portion includes a cutting portion body, a first cutting portion and a second cutting portion. The cutting part main body is hollow tubular. The first cutting portion includes a first half-tube portion. The second cutting portion includes a second half pipe portion, an inner surface of one of the first half pipe portion and the second half pipe portion and an inner surface of the cutting portion main body are located on the first cylindrical surface, and a minimum distance from the inner surface of the other of the first half pipe portion and the second half pipe portion to a central axis of the cutting portion main body is larger than a radius of the first cylindrical surface. The minimum distance from the inner surface of one of the first half pipe part and the second half pipe part to the central shaft of the cutting part main body is larger than the radius of the first cylindrical surface, so that a step part is formed at a welding position, and welding slag accumulation generated in the welding process cannot exceed the height of the inner surface of the cutting part main body, so that the problem of slag accumulation is effectively reduced or even eliminated.
Description
Technical Field
The application relates to the technical field of surgical instruments, in particular to a tissue cutting part, a tissue cutting instrument with the tissue cutting part and a processing method of the tissue cutting part.
Background
In some spinal procedures, it is desirable to resect some soft tissue with a surgical instrument. The related art provides surgical instruments generally having a jaw-shaped cutting device at a distal end thereof. With the trigger of the surgical instrument operated, the drive mechanism drives the upper and lower blade portions of the cutting device to close in opposition to separate a portion of the soft tissue from the patient's body.
However, after cutting is completed, there is a case where pushing of the pushing rod for pushing out the cut human tissue from the soft tissue forceps is difficult in the soft tissue forceps, which seriously affects the operation feeling of the medical staff.
Disclosure of Invention
In spinal surgery, due to the complexity of the anatomy and the narrowness of the operative space, the instrument design needs to be compatible with precision and minimally invasive. The periphery of the vertebra contains key tissues such as spinal cord, nerve root, blood vessel and the like, and soft tissues such as yellow ligament, epidural fat, paraspinal muscle and the like are distributed. For example, yellow ligament hypertrophy or calcification of the intervertebral disc may lead to spinal stenosis, requiring removal of diseased tissue by minimally invasive surgery to decompress. However, the conventional upper and lower bite type soft tissue forceps (such as nucleus pulposus forceps) have large volume, mainly require a large stroke in a closing manner, are difficult to penetrate into the center of a vertebral canal or a narrow gap, and may cause tissue residues or injure surrounding structures due to insufficient operation space. It is desirable to employ an elongate body in conjunction with a cannula that can force the two cutting portions closed as the cannula slides to separate a portion of the soft tissue from the patient's body. The slender design of the device is suitable for minimally invasive channels, the outer diameter is small, and the device can penetrate into narrow spaces such as vertebral canal and the like. The semi-tubular cutting part is attached to the arc-shaped surface, the spoon-shaped cutting part grabs tissues stably, the whole structure is compact, and the accurate operation requirement in a narrow space is met.
In the process of expanding and contracting the sleeve to drive the cutting parts to open and close, in order to ensure that the cutting parts do not displace in the axial direction, the two cutting parts need to be welded together.
After the two cutting parts are welded, residual welding slag at the joint is mainly accumulated in the connecting area of the cutting parts and the inner wall of the adjacent main body of the slender hollow cutting part. The pushing rod for pushing out resected tissue has extremely small fit clearance (usually less than or equal to 0.1 mm) with the inner wall when axially moving in the cutting part main body, and local bulges or burrs formed by welding slag directly increase the movement resistance of the pushing rod, and even cause clamping stagnation when serious, so as to influence the opening and closing actions of the cutting part. This has a negative impact on the reliability of the instrument. The long-term friction between the pushing rod and the welding slag can also accelerate the abrasion of the pushing rod, and the service life of the instrument is reduced.
The application aims to solve the problem that the movement of a pushing rod is blocked due to welding slag in the process of pushing a tissue.
The present disclosure provides, in a first aspect, a tissue resecting portion for use with a tissue resecting instrument. The tissue resecting portion includes a cutting portion body, a first cutting portion and a second cutting portion. The cutting part main body is hollow tubular. The first cutting portion includes a first half-tube portion. The second cutting part comprises a second half pipe part, the second half pipe part is welded with the first half pipe part and/or the cutting part main body, and the first half pipe part and the second half pipe part are integrally hollow tubular. The inner surface of one of the first half pipe portion and the second half pipe portion and the inner surface of the cutting portion main body are located on a first cylindrical surface, and the minimum distance from the inner surface of the other of the first half pipe portion and the second half pipe portion to the central axis of the cutting portion main body is larger than the radius of the first cylindrical surface.
The present disclosure forms a stepped portion at a welding position by designing an inner surface of one of the first half pipe portion and the second half pipe portion and an inner surface of the cutting portion main body to be located on a first cylindrical surface, and a minimum distance from the inner surface of the other of the first half pipe portion and the second half pipe portion to a central axis of the cutting portion main body to be greater than a radius of the first cylindrical surface. The step portion makes a height difference between an inner surface of the cutting portion main body to an inner surface of the second cutting portion and an inner surface of the first cutting portion to an inner surface of the second cutting portion. Due to the existence of the height difference, the welding slag accumulation generated in the welding process cannot exceed the height of the inner surface of the cutting part main body, so that the problem of slag accumulation is effectively reduced or even eliminated. The design not only reduces the abrasion to the pushing rod, but also avoids the condition of reducing the diameter of the pushing rod due to considering slag accumulation, and ensures that the working efficiency of the pushing rod is not affected.
In an exemplary embodiment, the second cutting portion further comprises a scoop portion that meets the distal end of the second half-tube portion and is disposed at an angle to the second half-tube portion, the second cutting portion having a thickness that is less than the thickness of the first cutting portion.
The present disclosure enables the first cutting portion to have greater rigidity against possible deformation of the distal end due to the pressure of the cannula due to the greater thickness when the distal end of the first cutting portion and the distal end of the second cutting portion are in contact by designing the thickness of the second cutting portion to be smaller than the thickness of the first cutting portion. In addition, under the condition that the material is unchanged, the thinner the thickness is, the easier the bending is, thereby providing better flexibility and labor saving effect when cutting, and simultaneously ensuring the cutting efficiency. Thus, the structural stability of the first cutting part is ensured, and the cutting performance of the second cutting part is improved, so that more efficient cutting operation is realized.
In an exemplary embodiment, the first half pipe portion and the second half pipe portion have a connecting section and a spacing section integrally formed therein, the connecting section being closer to the cutting portion main body than the spacing section, the first half pipe portion and the second half pipe portion being welded at the connecting section, and a gap being formed between the first cutting portion and the second cutting portion at the spacing section.
Because the gap is formed, when the second cutting part is driven by the sleeve to bend, the stress of the second cutting part at the bending part is maximum, and the second cutting part is easy to generate plastic deformation due to fatigue, so that the opening angle of the first cutting part and the second cutting part at the far end is reduced, and the cutting efficiency is affected. The second cutting part is provided with the gap, so that when the second cutting part is driven by the sleeve to bend, the second cutting part is bent in the direction of the gap, so that the stress generated by the second cutting part at the bending part is reduced, and the plastic deformation possibility of the material of the second cutting part is reduced or even eliminated.
In an exemplary embodiment, the gap has a width W, the minimum distance from the inner surface of the second half pipe portion to the central axis is D, and the radius of the first cylindrical surface is R, wherein W≤D-R.
In order to ensure that the pushing rod can freely move along the axial direction, the minimum distance between the vertexes of the inner surfaces of the first half pipe portion and the second half pipe portion in the first direction is required to be larger than the diameter of the pushing rod, namely, when the second cutting portion is bent towards the direction of the gap V and the bending portion abuts against the first cutting portion, the minimum distance between the vertexes of the inner surfaces of the first half pipe portion and the second half pipe portion in the first direction is required to be larger than the diameter of the pushing rod. Since the diameter of the pushing rod is smaller than or equal to the diameter of the first cylindrical surface, the height difference D-R between the first half pipe portion and the second half pipe portion in the radial direction can be understood as the distance difference between the inner surfaces of the first half pipe portion and the second half pipe portion and the pushing rod, that is, the distance difference between the inner surfaces of the cutting portion main body and the second half pipe portion and the pushing rod. If the inner surface of the second cutting part is lifted to the same height as the inner surface of the cutting part body, the distance from the inner surface of the second cutting part to the push rod is equal to the distance from the cutting part body to the push rod. Because the diameter of the pushing rod is smaller than or equal to the inner diameter of the cutting part main body, the lifting height of the inner surface of the second cutting part cannot exceed the distance difference between the cutting part main body and the inner surface of the second cutting part and the pushing rod respectively, and because the lifting height of the inner surface of the second cutting part is determined by the width W of the gap V, the width W of the gap V is smaller than or equal to D-R, so that the lifting height of the inner surface of the second cutting part always does not exceed the distance difference between the cutting part main body and the inner surface of the second cutting part and the distance difference between the inner surface of the second cutting part and the pushing rod respectively, and the pushing rod can freely move along the axial direction.
In an exemplary embodiment, the outer surfaces of the cutting part body, the first half pipe part and the second half pipe part are located on the second cylindrical surface. That is, the seam between the second cutting part and the first cutting part has no height difference, no seam undulation and smooth surface. The seam between the second cutting part and the cutting part main body on the outer surface has no height difference, no seam fluctuation and smooth surface. The flat and smooth surface can largely avoid unnecessary injury to the patient when the tissue resections extend into the patient.
In an exemplary embodiment, the second cutting portion has a first groove at a junction of the cutting portion body and the first cutting portion at an outer surface of the tissue cutting portion, and a second groove at a junction of the second cutting portion and the first cutting portion. The recess is adapted to receive slag generated during welding. To further ensure the surface to be flat and smooth.
In an exemplary embodiment, the first cutting portion has a first facet and the second cutting portion has a second facet, the first facet being in close abutment with the second facet when the first and second cutting portions are closed.
In the prior art, the cutting mode generally adopts a mode of cutting edges oppositely, namely the cutting mode is similar to cutting meat on an chopping board. Such cutting means allow for a more efficient cut, however, during surgical resection, particularly during cutting of the soft tissue of the spine, extremely small overspray cuts may cause inconceivable injuries to the patient. In the conventional mode of cutting edge face-to-face, cutting does not occur only when the cutting edge moves toward the cutting edge, but the sharp edge of the cutting edge begins to cut when contacting soft tissue, and thus erroneous cutting of soft tissue or excessive cutting of soft tissue occurs. To avoid the above-described problem injuries, the present disclosure proposes that the first facet is tightly abutted against the second facet, and that the excision of the target soft tissue is achieved by way of increased pressure. The traditional sharp cutting edge is changed into a relatively blunt cutting edge surface, so that the contact area between the cutting edge and soft tissues is increased, the pressure is reduced, and the soft tissues are prevented from being damaged undesirably. This allows cutting of soft tissue only when the first cutting portion and the second cutting portion are relatively moved and require application of a greater pressure than in conventional cutting methods.
In an exemplary embodiment, the width of the second facet is greater than 0.1mm.
The present disclosure provides in a second aspect a tissue removal instrument comprising a tissue removal section as described in the first aspect.
The present disclosure provides in a third aspect a method of machining a tissue resection,
The processing method comprises the steps of providing a cutting part main body which is hollow and tubular. A first cutting portion is provided, the first cutting portion including a first half-pipe portion. Providing a second cutting part, wherein the second cutting part comprises a second half pipe part, the second half pipe part is welded with the first half pipe part and/or the cutting part main body, and the first half pipe part and the second half pipe part are integrally hollow tubular. The inner surface of one of the first half pipe portion and the second half pipe portion and the inner surface of the cutting portion main body are set to lie on the first cylindrical surface, and the minimum distance from the inner surface of the other of the first half pipe portion and the second half pipe portion to the central axis of the cutting portion main body is set to be larger than the radius of the first cylindrical surface.
The inner surface of one of the first half pipe portion and the second half pipe portion and the inner surface of the cutting portion main body may be disposed to lie on the first cylindrical surface by cutting a complete hollow cylindrical pipe at one end, that is, integrally forming one of the first half pipe portion and the second half pipe portion with the cutting portion main body to form a desired bonding pattern of the cutting portion main body and the first cutting portion. The other of the first half pipe portion and the second half pipe portion may be formed by cutting a half pipe portion from a complete hollow cylindrical pipe or elliptic cylindrical pipe along the direction of the central axis extension and machining, and the minimum distance (for example, 1/2 of the minor axis of the elliptic cylindrical cross section) from the inner surface of the half pipe portion to the central axis of the cutting portion main body is greater than the minimum distance from the inner surface of the cutting portion main body to the axial center of the cutting portion main body.
The production efficiency can be improved by integrally forming one of the first half pipe portion and the second half pipe portion with the cut portion main body.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below. It is to be understood that the following drawings illustrate only some, but not all, embodiments of the disclosure.
It should be understood that the same or similar reference numerals are used throughout the drawings to designate the same or similar elements (components or portions thereof).
It should be understood that the figures are merely schematic and that the dimensions and proportions of the elements (components or portions thereof) in the figures are not necessarily accurate.
FIG. 1 is a schematic structural view of a tissue removal instrument in accordance with an embodiment of the present disclosure.
Fig. 2 is a schematic view showing a state when a tissue cut portion is cut according to an embodiment of the present disclosure.
Fig. 3 shows a schematic view of a region structure of a tissue cut according to an embodiment of the present disclosure.
Fig. 4 illustrates a partial structural cross-sectional schematic view of a tissue cut-out according to an embodiment of the present disclosure.
Fig. 5 illustrates an assembled schematic view of a tissue cut-out according to an embodiment of the present disclosure.
Fig. 6 illustrates a partial structural cross-sectional schematic view of a soft tissue resecting structure in accordance with an embodiment of the present disclosure.
Fig. 7 illustrates yet another partial structural cross-sectional schematic of a tissue cut according to an embodiment of the present disclosure.
Fig. 8 illustrates a partial structural schematic view of a tissue cut-out according to another embodiment of the present disclosure.
Fig. 9 and 10 illustrate partial cross-sectional views of a tissue cut in one state according to another embodiment of the present disclosure.
Fig. 11 and 12 show partial cross-sectional schematic views of a tissue cut-out in another state according to another embodiment of the present disclosure.
Fig. 13 shows an enlarged partial schematic view of a tissue cut-out according to yet another embodiment of the present disclosure.
Fig. 14 shows another enlarged partial schematic view of a tissue cut-out according to yet another embodiment of the present disclosure.
Fig. 15 illustrates a schematic view of a distal partial structure of a tissue ablation portion according to yet another embodiment of the present disclosure.
Detailed Description
Technical solutions in the embodiments of the present disclosure will be exemplarily described below with reference to the drawings in the embodiments of the present disclosure. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present disclosure. The components of the embodiments of the present disclosure, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the disclosure, as claimed, but is merely representative of selected embodiments of the disclosure.
As shown in fig. 1-2, the present disclosure provides a tissue removal instrument for fine soft tissue removal, consisting of a proximal manipulator portion 1 and a distal tissue removal portion 2, the manipulator portion 1 and the tissue removal portion 2 being separated by a dashed line P1 in fig. 1. The proximal end of the tissue cutting section 2 is connected to the distal end of the manipulation section 1. The tissue removal instrument further comprises a sleeve 26 that is sleeved outside the tissue removal section 2, one end of the sleeve 26 extending into the manipulator section 1.
The operating section 1 includes a handle 12, a control trigger 14, and a rack-and-pinion transmission mechanism (not shown) built in the interior of the handle. The tissue cutting portion 2 includes a tissue cutting portion, specifically, a pair of cutting portions (a first cutting portion 22 and a second cutting portion 24). The movement of the trigger is translated into axial movement of the sleeve 26 by a gear-rack transmission forcing the pair of cutting portions to progressively close over a range of opening. When soft tissue exists between the pair of cutting portions, completion of the closing operation means completion of one cutting operation with respect to the soft tissue, and the cut soft tissue is accommodated in a space defined by the pair of cutting portions.
The tissue removal instrument also includes a push rod (not shown). The push rod is at least partially located within the cutting portion body, specifically, the proximal end of the push rod is disposed within the handle and the distal end is disposed within the cutting portion body, extending axially of the cutting portion body. Under the operation of the operating portion, the push rod is movable in the axial direction relative to the cutting portion main body, and the distal-most end of the push rod is brought into a position with the first cutting portion and the second cutting portion. The push rod is adapted to push the severed body tissue out of the tissue removal instrument.
As shown in fig. 3-7, in an exemplary embodiment, the present disclosure provides a tissue ablation portion for use with a tissue ablation instrument. The tissue resecting portion comprises a cutting portion body 21, a first cutting portion 22, a second cutting portion 24. In fig. 3, the cutting portion main body 21 is shown as a structure within the region Q1, and the first cutting portion 22 is shown as a structure within the region Q2 and the region Q3 in fig. 3.
The cutting portion body 21 has a hollow tubular shape, and a proximal end is fixedly provided in the handle.
The first cutting portion 22 includes a first half pipe portion 221, and the first half pipe portion 221 is shown in fig. 3 as a structure within the region Q2.
The second cutting part 24 includes a second half pipe part 241, which is welded to the first half pipe part and welded to the second half pipe part cutting part body if the first cutting part is integrally formed at the distal end of the cutting part body. If the second cutting portion is integrally formed at the distal end of the cutting portion main body, the second cutting portion is welded to the first half pipe portion. The "integral formation" may be cutting a complete hollow tubular structure at one end to form the desired bond of the cutting portion body with either the first cutting portion or the second cutting portion. In the present embodiment, the first cutting portion 22 is integrally formed at the distal end of the cutting portion main body 21. In other embodiments, the second cutting portion is integrally formed with the distal first half tube portion and the second half tube portion of the cutting portion body, and is hollow and tubular in shape as a whole.
Illustratively, as shown in fig. 4, the inner surface of the first half pipe portion 22 and the inner surface of the cutting portion main body 21 are located on a first cylindrical surface, and the minimum distance from the inner surface of the second half pipe portion 24 to the central axis of the cutting portion main body 21 is greater than the radius of the first cylindrical surface. The inner surface of the second half 24 may be cylindrical or oval cylindrical.
The present embodiment is based on the first half-pipe portion being integrally formed with the cutting portion body. In other embodiments, when the second half pipe portion is integrally formed with the cutting portion main body, then the inner surface of the second half pipe portion and the inner surface of the cutting portion main body are located on the first cylindrical surface S1, and the inner surface of one of the second half pipe portions and the inner surface of the cutting portion main body are located on the first cylindrical surface S1, and the minimum distance from the inner surface of the first half pipe portion to the central axis of the cutting portion main body is greater than the radius of the first cylindrical surface S1.
As shown in fig. 5, the second half pipe portion 241 is adapted to the first half pipe portion 221 and is welded to the first half pipe portion 221 and the cutting portion main body 21, that is, after the first half pipe portion 221 is welded to the second half pipe portion 241, the whole of the first half pipe portion 221 and the second half pipe portion 241 forms a complete and closed hollow tubular structure. The opening and closing of the distal ends of the first and second cutting portions 22, 24, separated from each other (i.e., the configuration shown as Q3 and Q6 in fig. 3), under operation, effects the excision of soft tissue.
As shown in FIG. 6, the push rod 28 of the tissue removal instrument is at least partially positioned within the cutting portion body 21 and extends coaxially with the cutting portion body 21. In operation, the push rod 28 is movable in the axial direction with respect to the cutter body 21, and the most distal end of the push rod 28 can reach a position facing the inner surfaces of the first half pipe portion 221 and the second half pipe portion 241, whereupon, as shown in fig. 7, since the minimum distance from the inner surface of the second half pipe portion 241 to the central axis of the cutter body 21 is greater than the radius of the first cylindrical surface S1, and the push rod 28 extends coaxially with the cutter body 21, the distance D2 from the inner surface of the second half pipe portion 241 to the push rod 28 is greater than the distance D1 from the inner surface of the first half pipe portion 221 to the push rod 28.
The present disclosure forms a stepped portion at a welding position by setting a minimum distance of an inner surface of the second half pipe portion 241 to a central axis of the cutting portion main body 21 to be greater than a radius of the first cylindrical surface S1. The stepped portion makes a height difference from the inner surface of the cutting portion main body 21 to the inner surface of the second half pipe portion 241 and from the inner surface of the first half pipe portion 221 to the inner surface of the second half pipe portion 241. Due to the height difference, the slag deposited on the inner surface of the second half pipe portion 241 during welding does not exceed the height of the inner surface of the first half pipe portion 221 and does not exceed the height of the inner surface of the cutting portion main body 21, thereby effectively reducing or even eliminating the problem of the blocking of the pusher action caused by slag deposition. The design reduces the abrasion to the pushing rod, avoids the condition of reducing the diameter of the pushing rod due to the fact that welding slag accumulation is considered, and ensures that the working efficiency of the pushing rod is not affected. The height difference formed between the inner surface of the first cutting part and the inner surface of the second cutting part also solves the problem that partial soft tissues possibly exist near the connecting part at the connecting part of the first cutting part and the second cutting part due to the blocking of solder and the like, and the secondary use is affected.
The present application solves the problem of the push rod 28 being blocked from moving due to slag during pushing of tissue by the height difference formed between the inner surface of the first cutting portion 22 and the inner surface of the second cutting portion 24.
In an exemplary embodiment, as shown in fig. 2, 3 and 8, the tissue ablation portion further includes a cannula 26. The sleeve 26 is fitted over the cutter body 21 and is movable in the axial direction relative to the cutter body 21. The second cutting portion 24 further includes a spoon-shaped portion 242, the second cutting portion 24 has a bending point N, the spoon-shaped portion 242 is a portion from the bending point N to the most distal end of the second cutting portion 24 (as shown in fig. 3 as a structure of Q6), the spoon-shaped portion 242 is connected to the distal end of the second half pipe portion 241 and is disposed at an included angle with the second half pipe portion 241, and a focal point of the included angle is the bending point N. The scoop portion 242 includes a scoop portion and a long straight scoop handle portion that is progressively offset from the central axis in the axial direction from the proximal to the distal scoop handle portion. Movement of the sleeve 26 in the axial direction squeezes the scoop handle such that the distal-most end of the second cutting portion 24 is rotated about the inflection point N. The cannula 26 applies a certain pressure to the second cutting portion 24 to rotate the second cutting portion 24 about the inflection point N, so that the first and second cutting portions 22, 24 are urged to close more tightly, thereby enabling effective cutting of small and tough body tissue, and the pressing force applied to the second cutting portion 24 to rotate about the inflection point N is not reduced until the soft tissue is resected from the body. If the thickness of the second cutting portion 24 and the first cutting portion 22 is the same or greater than the thickness of the first cutting portion 22, then when the distal end of the second cutting portion 24 and the distal end of the first cutting portion 22 are in contact, the pressure transmitted by the cannula 26 through the second cutting portion 24 to the first cutting portion 22 may cause the distal end of the first cutting portion 22 to deform when contacting the second cutting portion 24 due to insufficient thickness of the first cutting portion 22, resulting in reduced cutting efficiency.
To solve this problem, the present disclosure provides that the thickness of the second cut portion is smaller than the thickness of the first cut portion. By designing the thickness of the second cutting portion to be smaller than the thickness of the first cutting portion, the first cutting portion can have a greater stiffness against possible deformation of the distal end due to the pressure of the cannula due to the greater thickness when the distal end of the first cutting portion and the distal end of the second cutting portion are in contact. In addition, under the condition that the material is unchanged, the thinner the thickness is, the easier the bending is, thereby providing better flexibility and labor saving effect when cutting, and simultaneously ensuring the cutting efficiency. Thus, the structural stability of the first cutting part is ensured, and the cutting performance of the second cutting part is improved, so that more efficient cutting operation is realized.
In an exemplary embodiment, as shown in fig. 3 and 9, a connection section (see the region shown by Q7 in fig. 3) and a spacing section (see the regions shown by Q8 and Q9 in fig. 3) are provided in the entirety of the first half pipe 221 and the second half pipe 241, the connection section being closer to the cutting portion main body 21 than the spacing section, and a gap V being formed between the first cutting portion 22 and the second cutting portion 24 at the connection section, the first half pipe 221 and the second half pipe 241. The gap V is formed in particular in the region indicated by Q8 in fig. 3, corresponding to the combination of the second cut 24, i.e. between the inflection point N and the most distal end of the second half-tube 241 (i.e. in the region indicated by Q5 in fig. 3), and the corresponding portion on the first cut 22. The gap V has a uniform width.
Due to the formation of the gap V, when the second cutting portion 24 is driven by the sleeve 26 to bend, the stress of the second cutting portion 24 at the bending point N is maximum, and the second cutting portion 24 is easily deformed plastically due to fatigue, so that the opening angle of the first cutting portion 22 and the second cutting portion 24 at the distal end becomes smaller, and the cutting efficiency is affected. The present disclosure provides additional bending space for the second cutting portion 24 by providing the gap V such that when the second cutting portion 24 is bent by the driving of the sleeve 26, the second cutting portion 24 is bent in the direction of the gap V as a whole to reduce the stress generated by the second cutting portion 24 at the bending point N, thus reducing or even eliminating the possibility of plastic deformation of the material of the second cutting portion 24.
In an exemplary embodiment, as shown in fig. 9-12, the width of the gap is W, the minimum distance from the inner surface of the second half pipe portion to the central axis is D, the radius of the first cylindrical surface S1 is R, where w+.d-R, i.e., the width of the gap V is smaller than the difference in height between the first and second cut portions 22 and 24 in the radial direction. Since the first half pipe portion 221 and the cutting portion main body 21 are located on the first cylindrical surface S1, it can be understood that the width of the gap V is smaller than the height difference between the first cutting portion 22 and the cutting portion main body 21 in the radial direction.
In order to ensure that the push rod 28 (indicated by a broken line in the drawing) can move freely in the axial direction, it is necessary that the minimum distance between the apexes of the inner surfaces of the first half pipe portion 221 and the second half pipe portion 241 in the first direction is larger than the diameter of the push rod 28, that is, when the second cut portion 24 is bent in the direction toward the gap V and the bent portion abuts against the first cut portion 22, the minimum distance between the apexes of the inner surfaces of the first half pipe portion 221 and the second half pipe portion 241 in the first direction is larger than the diameter of the push rod 28. Since the diameter of the push rod 28 is equal to or smaller than the diameter of the first cylindrical surface S1, the height difference D-R between the first half pipe portion 221 and the second half pipe portion 241 in the radial direction can be understood as the distance difference between the inner surfaces of the first half pipe portion 221 and the second half pipe portion 241 and the push rod 28, that is, the distance difference between the inner surfaces of the cutting portion main body 21 and the second half pipe portion 241 and the push rod 28, respectively. If the inner surface of the second cutting part 24 is lifted to the same height as the inner surface of the cutting part body 21, the distance from the inner surface of the second cutting part 24 to the push rod 28 is equal to the distance from the cutting part body 21 to the push rod 28. Since the diameter of the pushing rod 28 is smaller than or equal to the inner diameter of the cutting part main body 21, the height of the lifting of the inner surface of the second cutting part 24 cannot exceed the distance difference between the cutting part main body 21 and the inner surface of the second cutting part 24 and the pushing rod 28 respectively, and since the height of the lifting of the inner surface of the second cutting part 24 is determined by the width W of the gap V, the width W of the gap V is set to be smaller than or equal to D-R, so that the height of the lifting of the inner surface of the second cutting part 24 always does not exceed the distance difference between the cutting part main body 21 and the inner surface of the second cutting part 24 and the pushing rod 28 respectively, and the pushing rod 28 can be ensured to freely move along the axial direction.
In an exemplary embodiment, as shown in fig. 13, the outer surfaces of the cutting portion main body 21, the first half pipe portion 221, and the second half pipe portion 241 are located on the second cylindrical surface S2, that is, the second cutting portion 24 has the same outer diameter as the first cutting portion 22. That is, the second cutting portion 24 and the first cutting portion 22 have no level difference at the joint of the outer surface, no seam undulation, and a flat and smooth surface. The second cutting portion 24 and the cutting portion main body 21 have no height difference at the joint of the outer surface, no joint undulation, and flat and smooth surface. The flat and smooth surface can largely avoid unnecessary injury to the patient when the tissue resections extend into the patient.
In an exemplary embodiment, as shown in fig. 14, a first groove G1 is provided at the connection position of the second cutting portion 24 and the cutting portion main body 21 at the outer surface of the tissue cutting portion, and a second groove G2 is provided at the connection position of the second cutting portion 24 and the first cutting portion 22. The depth of the first groove G1 and the depth of the second groove are both smaller than the thickness of the second cut portion 24. The grooves are adapted to receive slag generated during welding to further ensure a smooth and even surface. Alternatively, the first groove G1 may be formed by chamfering one of the second cutting portion 24 and the first cutting portion 22, or chamfering both of the second cutting portion 24 and the first cutting portion 22, and the second groove G2 may be formed by chamfering one of the second cutting portion 24 and the cutting portion main body 21, or chamfering both of the second cutting portion 24 and the cutting portion main body 21.
In an exemplary embodiment, as shown in fig. 15, the first cutting portion 22 has a first facet F1 and the second cutting portion 24 has a second facet F2, the first facet F1 being in close abutment with the second facet F2 when the first and second cutting portions 22, 24 are closed. The first facet F1 and the second facet F2 are inclined at the same angle relative to the axis of the cutter body 21. The first facet F1 has a greater facet width than the second facet F2, the so-called "facet width", i.e., the dimension of the facet in the axial direction.
In the prior art, the cutting mode generally adopts a mode of cutting edges oppositely, namely the cutting mode is similar to cutting meat on an chopping board. Such cutting means allow for a more efficient cut, however, during surgical resection, particularly during cutting of the soft tissue of the spine, extremely small overspray cuts may cause inconceivable injuries to the patient. In the conventional mode of cutting edge face-to-face, cutting does not occur only when the cutting edge moves toward the cutting edge, but the sharp edge of the cutting edge begins to cut when contacting soft tissue, and thus erroneous cutting of soft tissue or excessive cutting of soft tissue occurs. To avoid the above-described problem injuries, the present disclosure proposes that the first facet is tightly abutted against the second facet, and that the excision of the target soft tissue is achieved by way of increased pressure. The traditional sharp cutting edge is changed into a relatively blunt cutting edge surface, so that the contact area between the cutting edge and soft tissues is increased, the pressure is reduced, and the soft tissues are prevented from being damaged undesirably. This allows cutting of soft tissue only when the first cutting portion 22 and the second cutting portion 24 are relatively moved and require application of greater pressure than in conventional cutting methods.
In an exemplary embodiment, the width of the second facet is greater than 0.1mm.
The present disclosure provides in a third aspect a method of machining a tissue resecting portion, the method comprising providing a cutting portion body, the cutting portion body being hollow tubular. A first cutting portion is provided, the first cutting portion including a first half-pipe portion. Providing a second cutting part, wherein the second cutting part comprises a second half pipe part, the second half pipe part is welded with the first half pipe part and/or the cutting part main body, and the first half pipe part and the second half pipe part are integrally hollow tubular. The inner surface of one of the first half pipe portion and the second half pipe portion and the inner surface of the cutting portion main body are set to lie on the first cylindrical surface S1, and the minimum distance from the inner surface of the other of the first half pipe portion and the second half pipe portion to the central axis of the cutting portion main body is set to be larger than the radius of the first cylindrical surface S1.
The inner surface of one of the first half pipe portion and the second half pipe portion and the inner surface of the cutting portion main body are arranged to lie on the first cylindrical surface S1 by cutting a complete hollow cylindrical pipe at one end, that is, integrally forming one of the first half pipe portion and the second half pipe portion with the cutting portion main body to form a desired bonding pattern of the cutting portion main body and the first cutting portion. The other of the first half pipe portion and the second half pipe portion may be formed by cutting a half pipe portion from a complete hollow cylindrical pipe or elliptic cylindrical pipe along the direction of the central axis extension and machining, and the minimum distance (for example, 1/2 of the minor axis of the elliptic cylindrical cross section) from the inner surface of the half pipe portion to the central axis of the cutting portion main body is greater than the minimum distance from the inner surface of the cutting portion main body to the axial center of the cutting portion main body.
The production efficiency can be improved by integrally forming one of the first half pipe portion and the second half pipe portion with the cut portion main body.
Claims (10)
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| CN202510317686.5A CN119818152B (en) | 2025-03-18 | 2025-03-18 | Tissue resection part, tissue resection instrument and processing method |
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| CN202510317686.5A CN119818152B (en) | 2025-03-18 | 2025-03-18 | Tissue resection part, tissue resection instrument and processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110461245A (en) * | 2017-01-26 | 2019-11-15 | 花朵医疗有限公司 | Biopsy instrument |
| CN219397468U (en) * | 2022-11-15 | 2023-07-25 | 武汉迈瑞医疗技术研究院有限公司 | Ultrasonic surgical instrument and ultrasonic knife system |
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| US6428539B1 (en) * | 2000-03-09 | 2002-08-06 | Origin Medsystems, Inc. | Apparatus and method for minimally invasive surgery using rotational cutting tool |
| EP1912575B1 (en) * | 2005-07-29 | 2011-01-19 | Vertos Medical, Inc. | Percutaneous tissue excision devices |
| WO2012112579A1 (en) * | 2011-02-15 | 2012-08-23 | Spine View, Inc. | Discectomy devices and related methods |
| CN113040870B (en) * | 2019-12-26 | 2023-03-21 | 先健科技(深圳)有限公司 | Ostomy appliance |
| CN115624372B (en) * | 2022-12-15 | 2023-04-07 | 北京新云医疗科技有限公司 | Surgical instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110461245A (en) * | 2017-01-26 | 2019-11-15 | 花朵医疗有限公司 | Biopsy instrument |
| CN219397468U (en) * | 2022-11-15 | 2023-07-25 | 武汉迈瑞医疗技术研究院有限公司 | Ultrasonic surgical instrument and ultrasonic knife system |
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