Tissue resection part, tissue resection instrument and processing method

Abstract

The invention provides a tissue resection part which is applied to a tissue resection instrument. The tissue cutting part comprises a cutting part body, a first cutting part and a second cutting part. The cutting part body is in a hollow tubular shape. The first cutting part comprises a first half pipe part. The second cutting part comprises a second half-tube part, the inner surface of one of the first half-tube part and the second half-tube part and the inner surface of the cutting part main body are located on a first cylindrical surface, and the minimum distance from the inner surface of the other of the first half-tube part and the second half-tube part to the central axis of the cutting part main body is larger than the radius of the first cylindrical surface. The minimum distance between the inner surface of one of the first half pipe part and the second half pipe part and the central axis of the cutting part main body is designed to be larger than the radius of the first cylindrical surface, so that the step part is formed at the welding position, and welding slag accumulation generated in the welding process does not exceed the height of the inner surface of the cutting part main body; therefore, the problem of welding slag accumulation is effectively reduced or even eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of surgical instruments, and in particular to a tissue resection portion, a tissue resection instrument having the tissue resection portion, and a processing method of the tissue resection portion. Background Art

[0002] In some spinal canal surgeries, some soft tissues need to be removed using surgical instruments. The surgical instruments provided in the related art usually have a forceps-like cutting device at the distal end thereof. When the trigger of the surgical instrument is operated, the driving mechanism drives the upper and lower blades of the cutting device to move toward each other and close, so as to separate a part of the soft tissue from the patient's body.

[0003] However, after the cutting is completed, the pushing rod in the soft tissue forceps for pushing the cut human tissue out of the soft tissue forceps is difficult to push, which seriously affects the operation feeling of medical staff. Summary of the invention

[0004] In spinal surgery, due to the complexity of the anatomical structure and the narrowness of the operating space, the design of the instrument needs to take into account both precision and minimally invasiveness. The spine is surrounded by not only key tissues such as the spinal cord, nerve roots, and blood vessels, but also soft tissues such as the yellow ligament, epidural fat, and paraspinal muscles. For example, hypertrophy of the yellow ligament or calcification of the intervertebral disc may lead to spinal canal stenosis, and minimally invasive surgery is required to remove the diseased tissue to reduce pressure. However, traditional upper and lower bite soft tissue forceps (such as nucleus pulposus forceps) are large in size, mainly because their closing method requires a large stroke, making it difficult to penetrate into the center of the spinal canal or narrow gaps, and may cause tissue residue or accidental injury to surrounding structures due to insufficient operating space. Therefore, a slender body and sleeve linkage structure is required. When the sleeve slides, the two cutting parts can be forced to close to separate a part of the soft tissue from the patient's body. Its slender design is suitable for minimally invasive channels, with a small outer diameter, and can penetrate into narrow spaces such as the spinal canal. The semi-tubular cutting part fits the curved surface, the spoon-shaped cutting part grabs the tissue firmly, and the overall structure is compact, meeting the needs of precise operation in a small space.

[0005] In the process of the sleeve extending and retracting to drive the cutting parts to open and close, in order to ensure that the cutting parts do not move in the axial direction, the two cutting parts need to be partially welded together.

[0006] After the two cutting parts are welded, the welding slag remaining at the joint mainly accumulates in the cutting part connection area and the inner wall of the adjacent slender hollow cutting part body. The push rod used to push out the excised tissue has a very small clearance with the inner wall when it moves axially in the cutting part body (usually ≤0.1mm). The local protrusions or burrs formed by the welding slag directly increase the movement resistance of the push rod, and even cause jamming in severe cases, affecting the opening and closing action of the cutting part. This has a negative impact on the reliability of the instrument. The long-term friction between the push rod and the welding slag will also accelerate the wear of the push rod and reduce the service life of the instrument.

[0007] The present application aims to solve the problem that the movement of the push rod is hindered due to welding slag during the process of pushing the tissue.

[0008] The present disclosure provides a tissue excision portion in a first aspect, which is applied to a tissue excision instrument. The tissue excision portion includes a cutting portion body, a first cutting portion, and a second cutting portion. The cutting portion body is in a hollow tubular shape. The first cutting portion includes a first half-tube portion. The second cutting portion includes a second half-tube portion, and the second half-tube portion is welded to the first half-tube portion and / or the cutting portion body, and the first half-tube portion and the second half-tube portion are in a hollow tubular shape as a whole. The inner surface of one of the first half-tube portion and the second half-tube portion and the inner surface of the cutting portion body are located on a first cylindrical surface, and the minimum distance from the inner surface of the other of the first half-tube portion and the second half-tube portion to the central axis of the cutting portion body is greater than the radius of the first cylindrical surface.

[0009] The present invention forms a step portion at the welding position by designing that the inner surface of one of the first half-tube portion and the second half-tube portion and the inner surface of the cutting portion body are located on the first cylindrical surface, and the minimum distance from the inner surface of the other of the first half-tube portion and the central axis of the cutting portion body is greater than the radius of the first cylindrical surface. The step portion forms a height difference from the inner surface of the cutting portion body to the inner surface of the second cutting portion, and from the inner surface of the first cutting portion to the inner surface of the second cutting portion. Due to the existence of the height difference, the accumulation of welding slag generated during the welding process will not exceed the height of the inner surface of the cutting portion body, thereby effectively reducing or even eliminating the problem of welding slag accumulation. This design not only reduces the wear on the push rod, but also avoids the situation where the diameter of the push rod is reduced due to consideration of welding slag accumulation, ensuring that the working efficiency of the push rod is not affected.

[0010] In an exemplary embodiment, the second cutting portion further includes a spoon-shaped portion, which is connected to the distal end of the second half-tube portion and arranged at an angle to the second half-tube portion, and the thickness of the second cutting portion is less than that of the first cutting portion.

[0011] The present disclosure designs the thickness of the second cutting portion to be smaller than that of the first cutting portion, so that when the distal end of the first cutting portion contacts the distal end of the second cutting portion, the first cutting portion, due to its greater thickness, can have greater rigidity to resist possible deformation of the distal end caused by the pressure of the sleeve. In addition, when the material remains unchanged, the thinner the thickness, the easier it is to bend, thereby providing better flexibility and labor-saving effects during cutting, while ensuring cutting efficiency. This not only ensures the structural stability of the first cutting portion, but also improves the cutting performance of the second cutting portion, thereby achieving a more efficient cutting operation.

[0012] In an exemplary embodiment, the first half pipe portion and the second half pipe portion are integrally provided with a connecting section and a spacing section, wherein the connecting section is closer to the cutting portion body than the spacing section, the first half pipe portion and the second half pipe portion are welded in the connecting section, and a gap is formed between the first cutting portion and the second cutting portion in the spacing section.

[0013] Due to the formation of the gap, when the second cutting portion is driven by the sleeve to bend, the stress of the second cutting portion at the bending portion is the largest, and the second cutting portion is easily plastically deformed due to fatigue, resulting in a smaller opening angle of the first cutting portion and the second cutting portion at the distal end, affecting the cutting efficiency. The present disclosure provides an additional bending space for the second cutting portion by setting a gap, so that when the second cutting portion is driven by the sleeve to bend, the second cutting portion is bent as a whole toward the direction of the gap to reduce the stress generated by the second cutting portion at the bending portion, thereby reducing or even eliminating the possibility of plastic deformation of the material of the second cutting portion.

[0014] In an exemplary embodiment, the width of the gap is W, the minimum distance from the inner surface of the second half-tube portion to the central axis is D, and the radius of the first cylindrical surface is R, wherein W≤DR.

[0015] In order to ensure that the push rod can move freely in the axial direction, the minimum distance between the vertices of the inner surfaces of the first half-tube and the second half-tube in the first direction should be greater than the diameter of the push rod, that is, when the second cutting portion is bent in the direction toward the gap V and the bent portion is against the first cutting portion, the minimum distance between the vertices of the inner surfaces of the first half-tube and the second half-tube in the first direction should be greater than the diameter of the push rod. Since the diameter of the push rod is less than or equal to the diameter of the first cylindrical surface, the height difference DR between the first half-tube and the second half-tube in the radial direction can be understood as the difference in distance from the inner surfaces of the first half-tube and the second half-tube to the push rod, that is, the difference in distance from the inner surfaces of the cutting portion body and the second half-tube to the push rod. If the inner surface of the second cutting portion is raised to the same height as the inner surface of the cutting portion body, the distance from the inner surface of the second cutting portion to the push rod is equal to the distance from the cutting portion body to the push rod. Since the diameter of the push rod is less than or equal to the inner diameter of the cutting part body, the height to which the inner surface of the second cutting part is lifted cannot exceed the distance difference between the inner surface of the cutting part body and the second cutting part and the push rod respectively. Since the height to which the inner surface of the second cutting part is lifted is determined by the width W of the gap V, the present disclosure sets the width W of the gap V ≤ DR, so that the height to which the inner surface of the second cutting part is lifted does not exceed the distance difference between the inner surface of the cutting part body and the second cutting part and the push rod respectively, thereby ensuring that the push rod can move freely along the axial direction.

[0016] In an exemplary embodiment, the outer surfaces of the cutting portion body, the first half-tube portion, and the second half-tube portion are located on the second cylindrical surface. That is, there is no height difference at the joint between the second cutting portion and the first cutting portion at the outer surface, no seam undulation, and the surface is flat and smooth. There is no height difference at the joint between the second cutting portion and the cutting portion body at the outer surface, no seam undulation, and the surface is flat and smooth. When the tissue excision portion is extended into the patient's body, the flat and smooth surface can greatly avoid unnecessary harm to the patient.

[0017] In an exemplary embodiment, the outer surface of the tissue resection portion has a first groove at the connection position between the second cutting portion and the cutting portion body, and a second groove at the connection position between the second cutting portion and the first cutting portion. The groove is suitable for receiving welding slag generated during welding to further ensure a smooth surface.

[0018] In an exemplary embodiment, the first cutting portion has a first blade surface, and the second cutting portion has a second blade surface. When the first cutting portion and the second cutting portion are closed, the first blade surface is tightly abutted against the second blade surface.

[0019] In the existing cutting method, the method of relative cutting of the blade surface is generally adopted, which is similar to cutting meat on a chopping board. This cutting method can achieve high-efficiency cutting. However, in surgical resection, especially in the process of cutting the spinal soft tissue, extremely small over-cutting may cause unimaginable harm to the patient. In the existing method of relative cutting of the blade surface, cutting does not only occur when the cutting blade moves toward the cutting surface, but the sharp edge of the cutting blade has already started cutting when it contacts the soft tissue, which will cause miscutting of the soft tissue or excessive cutting of the soft tissue. In order to avoid the above-mentioned problem injuries, the present disclosure proposes that the first blade surface and the second blade surface are closely abutted to achieve the removal of the target soft tissue by increasing the pressure. The traditional sharp blade edge is changed to a relatively blunt blade surface to increase the contact area between the cutting blade and the soft tissue, reduce the pressure, and avoid causing unexpected damage to the soft tissue. In this way, the cutting of the soft tissue can only be achieved when the first cutting part and the second cutting part move relative to each other and a greater pressure than the traditional cutting method needs to be applied.

[0020] In an exemplary embodiment, the width of the second blade surface is greater than 0.1 mm.

[0021] The present disclosure provides a tissue resection instrument in a second aspect, comprising the tissue resection portion as described in the first aspect.

[0022] The present disclosure provides a method for processing a tissue excision portion in a third aspect. The processing method comprises providing a cutting part body, the cutting part body is in a hollow tubular shape. Providing a first cutting part, the first cutting part includes a first half-tube part. Providing a second cutting part, the second cutting part includes a second half-tube part, welding the second half-tube part to the first half-tube part and / or the cutting part body, the first half-tube part and the second half-tube part are in a hollow tubular shape as a whole. The inner surface of one of the first half-tube part and the second half-tube part and the inner surface of the cutting part body are set to be located on a first cylindrical surface, and the minimum distance from the inner surface of the other of the first half-tube part and the second half-tube part to the central axis of the cutting part body is set to be greater than the radius of the first cylindrical surface.

[0023] The inner surface of one of the first half-tube portion and the second half-tube portion and the inner surface of the cutting portion body can be arranged to be located on the first cylindrical surface by cutting and processing a complete hollow cylindrical tube at one end, that is, forming one of the first half-tube portion and the second half-tube portion and the cutting portion body in one piece to form a desired combination form of the cutting portion body and the first cutting portion. The other of the first half-tube portion and the second half-tube portion can be formed by cutting and processing a half-tubular portion from a complete hollow cylindrical tube or an elliptical tube along the extension direction of the central axis, and the minimum distance from the inner surface of the half-tube portion to the central axis of the cutting portion body (for example, 1 / 2 of the minor axis of the elliptical cross section) is greater than the distance from the inner surface of the cutting portion body to the axis of the cutting portion body.

[0024] The production efficiency can be improved by integrally forming one of the first half pipe portion and the second half pipe portion with the cutting portion body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate some embodiments of the present disclosure, not all.

[0026] It should be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements (members or components).

[0027] It should be understood that the drawings are merely schematic and that the sizes and proportions of elements (components or components) in the drawings are not necessarily accurate.

[0028] Figure 1 Schematic diagram of the structure of a tissue resection instrument according to an embodiment of the present disclosure.

[0029] Figure 2 A schematic diagram showing the state of a tissue resection portion performing cutting according to an embodiment of the present disclosure is shown.

[0030] Figure 3 A schematic diagram of the regional structure of a tissue resection portion according to an embodiment of the present disclosure is shown.

[0031] Figure 4 A schematic cross-sectional view of a local structure of a tissue resection portion according to an embodiment of the present disclosure is shown.

[0032] Figure 5 A schematic diagram of assembling a tissue resection portion according to an embodiment of the present disclosure is shown.

[0033] Figure 6 A partial structural cross-sectional schematic diagram of a soft tissue resection structure according to an embodiment of the present disclosure is shown.

[0034] Figure 7 FIG. 4 is a schematic cross-sectional view of another partial structure of a tissue resection portion according to an embodiment of the present disclosure.

[0035] Figure 8 A schematic diagram of the partial structure of a tissue resection portion according to another embodiment of the present disclosure is shown.

[0036] Fig. 9 and Fig.10 A partial cross-sectional schematic diagram of a tissue resection portion in a state according to another embodiment of the present disclosure is shown.

[0037] Fig.11 and Fig.12 A partial cross-sectional schematic diagram of a tissue resection portion in another state according to another embodiment of the present disclosure is shown.

[0038] Fig.13 A partially enlarged schematic diagram of a tissue resection portion according to yet another embodiment of the present disclosure is shown.

[0039] Fig.14 Another partially enlarged schematic diagram of a tissue resection portion according to yet another embodiment of the present disclosure is shown.

[0040] Fig.15 A schematic diagram of the local structure of the distal end of a tissue resection portion according to yet another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present disclosure will be described exemplarily below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, 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 present disclosure as claimed, but is merely representative of selected embodiments of the present disclosure.

[0043] like Figure 1-Figure 2As shown, the present disclosure provides a tissue removal instrument for delicate soft tissue removal, which is composed of a manipulation portion 1 located at a proximal end and a tissue removal portion 2 located at a distal end. Figure 1 The proximal end of the tissue removal part 2 is connected to the distal end of the manipulation part 1. The tissue removal instrument further comprises a sleeve 26 which is sleeved on the outside of the tissue removal part 2, and one end of the sleeve 26 extends into the manipulation part 1.

[0044] The operating part 1 includes a handle 12, a control trigger 14, and a gear-rack transmission mechanism (not shown) built into the handle. The tissue cutting part 2 includes a tissue cutting part, specifically a pair of cutting parts (a first cutting part 22 and a second cutting part 24). The movement of the trigger is converted into an axial movement of the sleeve 26 through the transmission of the gear-rack, forcing the pair of cutting parts to gradually close within a certain opening range. When there is soft tissue between the pair of cutting parts, the completion of the closing action means the end of a cutting action on the soft tissue, and the cut soft tissue is contained in the space defined by the pair of cutting parts.

[0045] The tissue removal instrument further includes a push rod (not shown). The push rod is at least partially located in the cutting part body. Specifically, the proximal end of the push rod is located in the handle, and the distal end of the push rod is located in the cutting part body, extending along the axial direction of the cutting part body. Under the operation of the operating part, the push rod can move relative to the cutting part body in the axial direction, and the farthest end of the push rod can reach the position of the first cutting part and the second cutting part. The push rod is suitable for pushing the cut human tissue out of the tissue removal instrument.

[0046] like Figure 3-Figure 7 As shown, in an exemplary embodiment, the present disclosure provides a tissue removal portion, which is applied to a tissue removal instrument. The tissue removal portion includes a cutting portion body 21, a first cutting portion 22, and a second cutting portion 24. Figure 3 In the figure, the cutting part body 21 is shown as a structure in the region Q1, and the first cutting part 22 is in the region Q2. Figure 3 The structure in the region Q2 and the region Q3 is shown in FIG.

[0047] The cutting part body 21 is in a hollow tubular shape, and the proximal end is fixed in the handle.

[0048] The first cutting portion 22 includes a first half pipe portion 221. Figure 3 The structure in region Q2 is shown in FIG.

[0049] The second cutting portion 24 includes a second half-tube portion 241. If the first cutting portion is integrally formed at the distal end of the cutting portion body, the second half-tube portion is welded to the first half-tube portion and the second half-tube cutting portion body is welded to the cutting portion body. If the second cutting portion is integrally formed at the distal end of the cutting portion body, the second cutting portion is welded to the first half-tube portion. "Integrally formed" may be a complete hollow tubular structure that is cut and processed at one end to form a desired combination of the cutting portion body and the first cutting portion or the second cutting portion. In this embodiment, the first cutting portion 22 is integrally formed at the distal end of the cutting portion body 21. In other embodiments, the second cutting portion is integrally formed at the distal end of the cutting portion body, and the first half-tube portion and the second half-tube portion are hollow tubular as a whole.

[0050] For example, Figure 4 As shown, the inner surface of the first half pipe portion 22 and the inner surface of the cutting portion body 21 are located on the first cylindrical surface, and the minimum distance between the inner surface of the second half pipe portion 24 and the central axis of the cutting portion body 21 is greater than the radius of the first cylindrical surface. The inner surface of the second half pipe portion 24 can be a cylindrical surface or an elliptical cylindrical surface.

[0051] This embodiment is based on the first half-tube portion being integrally formed with the cutting portion body. In other embodiments, when the second half-tube portion is integrally formed with the cutting portion body, the inner surface of the second half-tube portion and the inner surface of the cutting portion body are located on the first cylindrical surface S1, and the inner surface of one of the second half-tube portions and the inner surface of the cutting portion body are located on the first cylindrical surface S1, and the minimum distance from the inner surface of the first half-tube portion to the central axis of the cutting portion body is greater than the radius of the first cylindrical surface S1.

[0052] like Figure 5 As shown, the second half pipe portion 241 is matched with the first half pipe portion 221, and is respectively welded to the first half pipe portion 221 and the cutting portion body 21. That is, after the first half pipe portion 221 and the second half pipe portion 241 are welded, the first half pipe portion 221 and the second half pipe portion 241 form a complete closed hollow tubular structure. The distal ends (i.e., the ends of the first cutting portion 22 and the second cutting portion 24) separated from each other are Figure 3 The structures shown in Q3 and Q6 in the figure) are opened and closed during operation to achieve the removal of soft tissue.

[0053] like Figure 6 As shown, the push rod 28 of the tissue removal instrument is at least partially located in the cutting part body 21 and extends coaxially with the cutting part body 21. During operation, the push rod 28 can move axially relative to the cutting part body 21, and the farthest end of the push rod 28 can reach a position directly facing the inner surfaces of the first half tube 221 and the second half tube 241. Figure 7As shown, since the minimum distance from the inner surface of the second half tube portion 241 to the central axis of the cutting portion body 21 is greater than the radius of the first cylindrical surface S1, and the push rod 28 extends coaxially with the cutting portion body 21, the distance D2 from the inner surface of the second half tube portion 241 to the push rod 28 is greater than the distance D1 from the inner surface of the first half tube portion 221 to the push rod 28.

[0054] The present invention forms a step portion at the welding position by setting the minimum distance from the inner surface of the second half-tube portion 241 to the central axis of the cutting part body 21 to be greater than the radius of the first cylindrical surface S1. The step portion forms a height difference from the inner surface of the cutting part body 21 to the inner surface of the second half-tube portion 241, and from the inner surface of the first half-tube portion 221 to the inner surface of the second half-tube portion 241. Due to the existence of this height difference, the welding slag accumulated on the inner surface of the second half-tube portion 241 during the welding process will not exceed the height of the inner surface of the first half-tube portion 221, and will not exceed the height of the inner surface of the cutting part body 21, thereby effectively reducing or even eliminating the problem of the pusher being blocked due to the accumulation of welding slag. In addition, this design also reduces the wear on the push rod, and avoids the situation where the diameter of the push rod is reduced due to the consideration of welding slag accumulation, ensuring that the working efficiency of the push rod is not affected. The height difference formed between the inner surface of the first cutting portion and the inner surface of the second cutting portion also solves the problem of some soft tissue remaining near the connection between the first cutting portion and the second cutting portion due to obstruction of solder, thereby affecting secondary use.

[0055] The present application solves the problem of movement obstruction of the push rod 28 due to welding slag during the process of pushing tissue by forming a height difference between the inner surface of the first cutting portion 22 and the inner surface of the second cutting portion 24 .

[0056] In an exemplary embodiment, Figure 2 , Figure 3 and Figure 8 As shown, the tissue cutting portion further includes a sleeve 26. The sleeve 26 is sleeved on the cutting portion body 21 and can move relative to the cutting portion body 21 in the axial direction. 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 farthest end of the second cutting portion 24 (as shown in FIG. Figure 3The spoon-shaped portion 242 is connected to the distal end of the second half-tube portion 241 and is arranged at an angle with the second half-tube portion 241, and the focus of the angle is the bending point N. The spoon-shaped portion 242 includes a spoon portion and a long straight spoon handle portion, and the spoon handle portion gradually deviates from the central axis from near to far along the axial direction. The axial movement of the sleeve 26 squeezes the spoon handle portion, so that the farthest end of the second cutting portion 24 rotates around the bending point N. The sleeve 26 applies a certain pressure to the second cutting portion 24 to make the second cutting portion 24 rotate around the bending point N. In order to promote the first cutting portion 22 and the second cutting portion 24 to close more closely, so as to effectively cut small and tough body tissues, the squeezing force applied to enable the second cutting portion 24 to rotate around the bending point N will not be reduced before the soft tissue is removed from the body. If the thickness of the second cutting portion 24 is the same as or greater than the thickness of the first cutting portion 22, when the distal end of the second cutting portion 24 contacts the distal end of the first cutting portion 22, the pressure transmitted to the first cutting portion 22 by the sleeve 26 through the second cutting portion 24 may cause the distal end of the first cutting portion 22 to deform when contacting the second cutting portion 24 due to the insufficient thickness of the first cutting portion 22, thereby reducing the cutting efficiency.

[0057] In order to solve this problem, the present invention sets the thickness of the second cutting portion to be smaller than the thickness of the first cutting portion. By designing the thickness of the second cutting portion to be smaller than the thickness of the first cutting portion, when the distal end of the first cutting portion and the distal end of the second cutting portion are in contact, the first cutting portion, due to its larger thickness, can have greater rigidity to resist possible deformation of the distal end caused by the pressure of the sleeve. In addition, when the material remains unchanged, the thinner the thickness, the easier it is to bend, thereby providing better flexibility and labor-saving effects during cutting, while ensuring cutting efficiency. This not only ensures the structural stability of the first cutting portion, but also improves the cutting performance of the second cutting portion, thereby achieving a more efficient cutting operation.

[0058] In an exemplary embodiment, Figure 3 and Fig. 9 As shown, the first half pipe portion 221 and the second half pipe portion 241 have a connecting section (see Figure 3 The area shown in Q7) and the interval segment (see Figure 3 In the region shown by Q8 and Q9 in FIG. 1 , the connecting section is closer to the cutting portion body 21 than the spacing section. In the connecting section, the first half pipe portion 221 is welded to the second half pipe portion 241. In the spacing section, a gap V is formed between the first cutting portion 22 and the second cutting portion 24. The gap V is specifically formed at Figure 3 The area shown in Q8 corresponds to the second cutting portion 24, that is, between the bending point N and the farthest end of the second half pipe portion 241 (i.e. Figure 3The gap V is a combination of the Q5 area shown in FIG. 1 and the corresponding portion on the first cutting portion 22. The gap V has a uniform width.

[0059] 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 the largest, and the second cutting portion 24 is easily plastically deformed due to fatigue, resulting in a smaller opening angle of the first cutting portion 22 and the second cutting portion 24 at the distal end, affecting the cutting efficiency. The present disclosure provides an additional bending space for the second cutting portion 24 by setting the gap V, so that when the second cutting portion 24 is driven by the sleeve 26 to bend, the second cutting portion 24 is bent toward the direction of the gap V as a whole, so as to reduce the stress generated by the second cutting portion 24 at the bending point N, thereby reducing or even eliminating the possibility of plastic deformation of the material of the second cutting portion 24.

[0060] In an exemplary embodiment, Figure 9-12 As shown, the width of the gap is W, the minimum distance from the inner surface of the second half-tube portion to the central axis is D, and the radius of the first cylindrical surface S1 is R, wherein W≤DR, that is, the width of the gap V is smaller than the height difference between the first cutting portion 22 and the second cutting portion 24 in the radial direction. Since the first half-tube portion 221 and the cutting portion 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 body 21 in the radial direction.

[0061] In order to ensure that the push rod 28 (indicated by the dotted line in the figure) can move freely in the axial direction, it is required that the minimum distance between the vertices of the inner surfaces of the first half-tube portion 221 and the second half-tube portion 241 in the first direction should be greater than the diameter of the push rod 28, that is, when the second cutting portion 24 is bent in the direction toward the gap V and the bent portion abuts against the first cutting portion 22, the minimum distance between the vertices of the inner surfaces of the first half-tube portion 221 and the second half-tube portion 241 in the first direction should be greater than the diameter of the push rod 28. Since the diameter of the push rod 28 is less than or equal to the diameter of the first cylindrical surface S1, the height difference DR between the first half-tube portion 221 and the second half-tube portion 241 in the radial direction can be understood as the distance difference between the inner surfaces of the first half-tube portion 221 and the second half-tube portion 241 and the push rod 28, that is, the distance difference between the inner surfaces of the cutting portion body 21 and the second half-tube portion 241 and the push rod 28. If the inner surface of the second cutting portion 24 is raised to the same height as the inner surface of the cutting portion body 21, the distance from the inner surface of the second cutting portion 24 to the push rod 28 is equal to the distance from the cutting portion body 21 to the push rod 28. Since the diameter of the push rod 28 is less than or equal to the inner diameter of the cutting portion body 21, the height of the inner surface of the second cutting portion 24 cannot exceed the difference in distance from the inner surface of the cutting portion body 21 and the second cutting portion 24 to the push rod 28, and since the height of the inner surface of the second cutting portion 24 is determined by the width W of the gap V, the present disclosure sets the width W of the gap V ≤ DR, so that the height of the inner surface of the second cutting portion 24 does not exceed the difference in distance from the inner surface of the cutting portion body 21 and the second cutting portion 24 to the push rod 28, thereby ensuring that the push rod 28 can move freely in the axial direction.

[0062] In an exemplary embodiment, Fig.13 As shown, the outer surfaces of the cutting portion body 21, the first half-tube portion 221 and the second half-tube portion 241 are located on the second cylindrical surface S2, that is, the outer diameter of the second cutting portion 24 is the same as that of the first cutting portion 22. In other words, there is no height difference at the joint between the second cutting portion 24 and the first cutting portion 22 on the outer surface, no seam undulation, and the surface is flat and smooth. There is no height difference at the joint between the second cutting portion 24 and the cutting portion body 21 on the outer surface, no seam undulation, and the surface is flat and smooth. When the tissue excision portion is extended into the patient's body, the flat and smooth surface can greatly avoid unnecessary harm to the patient.

[0063] In an exemplary embodiment, Fig.14As shown, on the outer surface of the tissue resection portion, a first groove G1 is provided at the connection position of the second cutting portion 24 and the cutting portion body 21, 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 less than the thickness of the second cutting portion 24. The grooves are suitable for receiving welding slag generated during welding to further ensure that the surface is flat and smooth. Optionally, the first groove G1 can be formed by chamfering one of the second cutting portion 24 and the first cutting portion 22, or by chamfering both of the second cutting portion 24 and the first cutting portion 22; the second groove G2 can be formed by chamfering one of the second cutting portion 24 and the cutting portion body 21, or by chamfering both of the second cutting portion 24 and the cutting portion body 21.

[0064] In an exemplary embodiment, Fig.15 As shown, the first cutting portion 22 has a first blade face F1, and the second cutting portion 24 has a second blade face F2. When the first cutting portion 22 and the second cutting portion 24 are closed, the first blade face F1 and the second blade face F2 are tightly abutted. The first blade face F1 and the second blade face F2 have the same inclination angle relative to the axis of the cutting portion body 21. The blade face width of the first blade face F1 is greater than the blade face width of the second blade face F2. The so-called "blade face width" is the size of the blade face in the axial direction.

[0065] In the existing cutting method, the method of relative cutting of the blade surface is generally adopted, which is similar to cutting meat on a chopping board. Such a cutting method can achieve high efficiency cutting, but in surgical resection, especially in the process of cutting the spinal soft tissue, extremely small over-cutting may cause unimaginable harm to the patient. In the existing method of relative cutting of the blade surface, cutting does not only occur when the cutting blade moves toward the cutting surface, but the sharp edge of the cutting blade has already started cutting when it contacts the soft tissue, which will cause the soft tissue to be cut by mistake or excessively cut. In order to avoid the above-mentioned problem injury, the present disclosure proposes that the first blade surface and the second blade surface are closely abutted to achieve the removal of the target soft tissue by increasing the pressure. The traditional sharp blade edge is changed to a relatively blunt blade surface to increase the contact area between the cutting blade and the soft tissue, reduce the pressure, and avoid causing undesirable damage to the soft tissue. In this way, the soft tissue can only be cut when the first cutting part 22 and the second cutting part 24 move relative to each other and a greater pressure than the traditional cutting method needs to be applied.

[0066] In an exemplary embodiment, the width of the second blade surface is greater than 0.1 mm.

[0067] The present disclosure provides a method for processing a tissue excision portion in a third aspect, the method comprising providing a cutting portion body, the cutting portion body being in a hollow tubular shape. A first cutting portion is provided, the first cutting portion comprising a first half-tube portion. A second cutting portion is provided, the second cutting portion comprising a second half-tube portion, the second half-tube portion is welded to the first half-tube portion and / or the cutting portion body, and the first half-tube portion and the second half-tube portion are in a hollow tubular shape as a whole. The inner surface of one of the first half-tube portion and the second half-tube portion and the inner surface of the cutting portion body are set to be located on a first cylindrical surface S1, and the minimum distance from the inner surface of the other of the first half-tube portion and the second half-tube portion to the central axis of the cutting portion body is set to be greater than the radius of the first cylindrical surface S1.

[0068] The inner surface of one of the first half-tube portion and the second half-tube portion and the inner surface of the cutting portion body can be arranged to be located on the first cylindrical surface S1 by cutting and processing a complete hollow cylindrical tube at one end, that is, forming one of the first half-tube portion and the second half-tube portion and the cutting portion body in one piece to form a desired combination form of the cutting portion body and the first cutting portion. The other of the first half-tube portion and the second half-tube portion can be formed by cutting and processing a half-tubular portion from a complete hollow cylindrical tube or an elliptical tube along the extension direction of the central axis, and the minimum distance from the inner surface of the half-tube portion to the central axis of the cutting portion body (for example, 1 / 2 of the minor axis of the elliptical cross section) is greater than the distance from the inner surface of the cutting portion body to the axis of the cutting portion body.

[0069] The production efficiency can be improved by integrally forming one of the first half pipe portion and the second half pipe portion with the cutting portion body.

Claims

1. A tissue removal part, applied to a tissue removal instrument, characterized in that: The tissue removal portion comprises: A cutting part body, wherein the cutting part body is in a hollow tubular shape; a first cutting portion, the first cutting portion comprising a first half pipe portion; and The second cutting part includes a second half-tube part, the second half-tube part is welded to the first half-tube part and / or the cutting part body, and the first half-tube part and the second half-tube part are hollow tube-shaped as a whole, wherein The inner surface of one of the first half-tube portion and the second half-tube portion and the inner surface of the cutting portion body are located on a first cylindrical surface, and the minimum distance from the inner surface of the other of the first half-tube portion and the second half-tube portion to the central axis of the cutting portion body is greater than the radius of the first cylindrical surface.

2. The tissue resection portion according to claim 1, characterized in that: The second cutting portion further includes a spoon-shaped portion, which is connected to the distal end of the second half-tube portion and arranged at an angle to the second half-tube portion. The thickness of the second cutting portion is smaller than that of the first cutting portion.

3. The tissue resection portion according to claim 2, characterized in that: The first half pipe part and the second half pipe part are integrally provided with a connecting section and a spacing section, wherein the connecting section is closer to the cutting part body than the spacing section, wherein the first half pipe part and the second half pipe part are welded in the connecting section, and wherein a gap is formed between the first cutting part and the second cutting part in the spacing section.

4. The tissue resection portion according to claim 3, characterized in that: 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, and the radius of the first cylindrical surface is R, wherein W≤DR.

5. The tissue resection portion according to claim 1, characterized in that: The cutting portion body, the first half pipe portion and the second half pipe portion are located on a second cylindrical surface.

6. The tissue resection portion according to claim 5, characterized in that: On the outer surface of the tissue resection portion, a first groove is provided at a connection position between the second cutting portion and the cutting portion body, and a second groove is provided at a connection position between the second cutting portion and the first cutting portion.

7. The tissue resection portion according to claim 1, characterized in that: The first cutting portion has a first blade surface, and the second cutting portion has a second blade surface. When the first cutting portion and the second cutting portion are closed, the first blade surface is tightly against the second blade surface.

8. The tissue resection portion according to claim 7, characterized in that: The width of the second blade surface is greater than 0.1 mm.

9. A tissue removal instrument, characterized in that: comprising the tissue resection portion as claimed in claims 1 to 8, A cannula, which is sheathed outside the tissue removal part; The operating part includes a handle, a control trigger and a gear-rack transmission mechanism built into the handle, and the gear-rack transmission converts the movement of the control trigger into the axial movement of the sleeve through the transmission of the gear-rack, forcing the tissue removal part to gradually close within a certain opening range; as well as The push rod is at least partially located in the cutting part body of the tissue resection part, and the proximal end is arranged in the operating part. Under the operation of the operating part, the push rod can move axially relative to the cutting part body. The push rod is suitable for pushing the cut human tissue out of the tissue resection instrument.

10. A method for processing a tissue excision portion, characterized in that: include: Providing a cutting part body, wherein the cutting part body is in a hollow tubular shape; providing a first cutting portion, the first cutting portion comprising a first half pipe portion; and A second cutting portion is provided, wherein the second cutting portion comprises a second half pipe portion, and the second half pipe portion is welded to the first half pipe portion and / or the cutting portion body, wherein the first half pipe portion and the second half pipe portion are hollow tube-shaped as a whole. The inner surface of one of the first half-tube portion and the second half-tube portion and the inner surface of the cutting portion body are set to be located on a first cylindrical surface, and the minimum distance from the inner surface of the other of the first half-tube portion and the second half-tube portion to the central axis of the cutting portion body is set to be greater than the radius of the first cylindrical surface.

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