Tissue resection part, tissue resection instrument and processing method

Abstract

The present disclosure provides a tissue resection portion, which is applied to a tissue resection instrument. The tissue resection portion includes a cutting portion body, a first cutting portion, and a second cutting portion. The cutting portion body is in the shape of a hollow tube. The first cutting portion includes a first half-tube portion. The second cutting portion includes a second half-tube portion, and 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 between the inner surface of the other of the first half-tube portion and the second half-tube portion and the central axis of the cutting portion body is greater than the radius of the first cylindrical surface. The present disclosure forms a step portion at the welding position by designing the minimum distance between the inner surface of one of the first half-tube portion and the second half-tube portion and the central axis of the cutting portion body to be greater than the radius of the first cylindrical surface. The welding slag accumulation 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 welding slag accumulation problem.

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 method for processing the tissue resection portion. Background Art

[0002] During some spinal canal surgeries, surgical instruments are required to remove soft tissue. Conventional surgical instruments typically feature a forceps-like cutting mechanism at their distal ends. When the trigger of the surgical instrument is actuated, a drive mechanism forces the upper and lower blades of the cutting mechanism to move toward each other, closing them and separating a portion of soft tissue from the patient's body.

[0003] However, after the cutting is completed, the pushing rod located 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 operating feeling of medical staff. Summary of the Invention

[0004] In spinal surgery, due to the complex anatomy and confined operating space, instrument design must balance precision and minimally invasive procedures. The spine encompasses not only critical tissues such as the spinal cord, nerve roots, and blood vessels, but also soft tissues such as the ligamentum flavum, epidural fat, and paraspinal muscles. For example, hypertrophy of the ligamentum flavum or calcification of the intervertebral disc can lead to spinal canal stenosis, necessitating minimally invasive resection of the affected tissue to relieve pressure. However, traditional upper and lower interdigitating soft tissue forceps (such as nucleus pulposus forceps) are bulky and require a large stroke for their closing mechanism, making them difficult to penetrate deep into the center of the spinal canal or narrow interstices. Furthermore, due to limited operating space, tissue may remain or surrounding structures may be accidentally damaged. Therefore, a slender body coupled with a cannula is required. The sliding movement of the cannula forces the two cutting sections together, freeing a portion of soft tissue from the patient's body. Its slender design accommodates minimally invasive access, and its small outer diameter allows for penetration into narrow spaces such as the spinal canal. The semi-tubular cutting section conforms to the curved surface, while the scoop-shaped cutting section securely grasps tissue. The overall compact structure meets the requirements for precise operation in confined spaces.

[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 welding the two cutting sections, residual slag accumulates primarily in the cutting section connection area and adjacent inner wall of the elongated, hollow cutting section. The push rod, used to push out excised tissue, has a very small clearance (typically ≤0.1mm) against the inner wall during axial movement within the cutting section. The resulting localized protrusions or burrs from the slag directly increase the push rod's resistance to movement, and in severe cases, can even cause it to become stuck, hindering the opening and closing of the cutting section. This negatively impacts the reliability of the device. Prolonged friction between the push rod and the slag also accelerates wear, reducing the device's service life.

[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, in a first aspect, a tissue resection portion for use in a tissue resection instrument. The tissue resection portion includes a cutting portion body, a first cutting portion, and a second cutting portion. The cutting portion body is in the shape of a hollow tube. The first cutting portion includes a first half-tube portion. The second cutting portion includes a second half-tube portion, which 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 the shape of a hollow tube 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 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 to be located on the first cylindrical surface, and the minimum distance between 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 creates 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, thereby 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. The thickness of the second cutting portion is smaller than that of the first cutting portion.

[0011] By designing the thickness of the second cutting section to be thinner than that of the first cutting section, the present invention ensures that when the distal ends of the first and second cutting sections come into contact, the first cutting section, due to its greater thickness, possesses greater rigidity to resist possible deformation of the distal end due to the pressure of the cannula. Furthermore, while maintaining the same material, the thinner the thickness, the easier it is to bend, thus providing greater flexibility and labor-saving effects during cutting, while also ensuring cutting efficiency. This ensures the structural stability of the first cutting section while improving the cutting performance of the second cutting section, thereby achieving a more efficient cutting operation.

[0012] In an exemplary embodiment, the first half pipe portion and the second half pipe portion have a connecting section and a spacing section as a whole. 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. 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 bend is the greatest, which can easily lead to plastic deformation of the second cutting portion due to fatigue, resulting in a smaller opening angle between the first cutting portion and the second cutting portion at the distal end, affecting cutting efficiency. The present disclosure provides additional bending space for the second cutting portion by providing a gap, so that when the second cutting portion is driven by the sleeve to bend, the second cutting portion as a whole bends in the direction of the gap, thereby reducing the stress generated by the second cutting portion at the bend, 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 must 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 abuts 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 must 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 radial height difference DR between the first half-tube and the second half-tube 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 raised cannot exceed the distance difference between the inner surfaces 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 raised 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 raised does not exceed the distance difference between the inner surfaces of the cutting part body and the second cutting part and the push rod respectively, thereby ensuring that the push rod can move freely in 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. In other words, the outer surface of the second cutting portion and the first cutting portion have no height difference at the joint, no undulation, and a smooth and level surface. The outer surface of the second cutting portion and the cutting portion body have no height difference at the joint, no undulation, and a smooth and level surface. This smooth and level surface minimizes unnecessary injury to the patient when the tissue excision portion is inserted into the patient's body.

[0017] In an exemplary embodiment, the outer surface of the tissue excision portion has a first groove at the junction of the second cutting portion and the cutting portion body, and a second groove at the junction of the second cutting portion and the first cutting portion. The grooves are suitable for absorbing welding slag, thereby further ensuring 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] Among existing cutting methods, the method of cutting with opposing blade surfaces is generally adopted, which is similar to cutting meat on a chopping board. This cutting method can achieve relatively high cutting efficiency. However, in surgical resection, especially when cutting spinal soft tissue, even the slightest over-cutting may cause unimaginable harm to the patient. In the existing method of cutting with opposing blade surfaces, cutting does not only occur when the cutting blade moves toward the cutting surface, but the sharp edge of the cutting blade begins cutting when it contacts the soft tissue. This can cause erroneous cutting of soft tissue or excessive cutting of soft tissue. To avoid the above-mentioned problems and injuries, the present disclosure proposes that the first blade surface and the second blade surface are closely abutted, and the removal of the target soft tissue is achieved by increasing pressure. The traditional sharp blade edge is replaced with a relatively blunt blade surface to increase the contact area between the cutting blade and the soft tissue, reduce the pressure, and avoid unwanted damage to the soft tissue. In this way, the soft tissue can only be cut when the first cutting part and the second cutting part move relative to each other and a greater pressure is applied than in traditional cutting methods.

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

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

[0022] In a third aspect, the present disclosure provides a method for processing a tissue resection portion.

[0023] The processing method includes providing a cutting section body, the cutting section body being in a hollow tubular shape. Providing a first cutting section, the first cutting section comprising a first half-tube section. Providing a second cutting section, the second cutting section comprising a second half-tube section, and welding the second half-tube section to the first half-tube section and / or the cutting section body, the first half-tube section and the second half-tube section being in a hollow tubular shape as a whole. Arranging the inner surface of one of the first half-tube section and the second half-tube section to lie on a first cylindrical surface, and setting the minimum distance between the inner surface of the other of the first half-tube section and the central axis of the cutting section body to be greater than the radius of the first cylindrical surface.

[0024] The inner surface of one of the first and second half-tube sections and the inner surface of the cutting section body can be positioned on the first cylindrical surface by cutting a complete hollow cylindrical tube at one end, that is, integrally forming one of the first and second half-tube sections with the cutting section body to form the desired combined configuration of the cutting section body and the first cutting section. The other of the first and second half-tube sections can be formed by cutting a half-tubular portion from a complete hollow cylindrical tube or an elliptical tube along the central axis, and then machining the half-tubular portion. The minimum distance between the inner surface of the half-tube section and the central axis of the cutting section body (e.g., 1 / 2 of the minor axis of the elliptical cross-section) is greater than the distance between the inner surface of the cutting section body and the axis of the cutting section body.

[0025] 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

[0026] 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.

[0027] It should be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements (components or components).

[0028] 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.

[0029] Figure 1 Schematic diagram of the structure of a tissue resection instrument according to an embodiment of the present disclosure.

[0030] 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.

[0031] Figure 3 A schematic diagram of the regional structure of a tissue resection portion according to an embodiment of the present disclosure is shown.

[0032] 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.

[0033] Figure 5 FIG2 shows a schematic diagram of assembling a tissue resection portion according to an embodiment of the present disclosure.

[0034] Figure 6 A schematic cross-sectional view of a local structure of a soft tissue resection structure according to an embodiment of the present disclosure is shown.

[0035] Figure 7 FIG2 shows another partial cross-sectional schematic diagram of a tissue resection portion according to an embodiment of the present disclosure.

[0036] Figure 8 A schematic diagram of the partial structure of a tissue resection portion according to another embodiment of the present disclosure is shown.

[0037] Figure 9 and Figure 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.

[0038] Figure 11 and Figure 12 FIG2 is a partial cross-sectional schematic diagram showing a tissue resection portion in another state according to another embodiment of the present disclosure.

[0039] Figure 13 A partially enlarged schematic diagram of a tissue resection portion according to yet another embodiment of the present disclosure is shown.

[0040] Figure 14 Another partially enlarged schematic diagram of a tissue resection portion according to yet another embodiment of the present disclosure is shown.

[0041] Figure 15 A schematic diagram of the local structure of the distal end of a tissue resection portion according to another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to exemplify the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only some of the embodiments of the present disclosure, and not all of them. Generally, the components of the embodiments of the present disclosure described and shown in the drawings herein can be arranged and designed in a variety of different configurations.

[0043] 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.

[0044] like Figure 1-Figure 2As shown, the present disclosure provides a tissue resection instrument for delicate soft tissue resection, which is composed of a manipulation portion 1 at the proximal end and a tissue resection portion 2 at the distal end. Figure 1 The proximal end of the tissue resection portion 2 is connected to the distal end of the manipulation portion 1. The tissue resection instrument further comprises a sleeve 26 which is sheathed on the outside of the tissue resection portion 2, and one end of the sleeve 26 extends into the manipulation portion 1.

[0045] The operating unit 1 comprises a handle 12, a control trigger 14, and a gear-and-rack transmission mechanism (not shown) built into the handle. The tissue removal unit 2 includes a tissue removal section, specifically a pair of cutting sections (a first cutting section 22 and a second cutting section 24). The gear-and-rack transmission converts the trigger's movement into axial movement of the cannula 26, forcing the pair of cutting sections to gradually close within a certain opening range. When soft tissue exists between the pair of cutting sections, the completion of the closing action signifies the end of the soft tissue cutting operation, and the cut soft tissue is contained within the space defined by the pair of cutting sections.

[0046] The tissue removal instrument also includes a push rod (not shown). The push rod is at least partially located within the cutting section. Specifically, the proximal end of the push rod is located within the handle, and the distal end is located within the cutting section. The push rod extends axially along the cutting section. Under operation of the operating portion, the push rod is movable axially relative to the cutting section, and its distal end can be positioned adjacent to the first and second cutting sections. The push rod is adapted to push excised human tissue out of the tissue removal instrument.

[0047] like Figure 3-Figure 7 As shown, in an exemplary embodiment, the present disclosure provides a tissue resection portion, which is applied to a tissue resection instrument. The tissue resection portion includes a cutting portion body 21, a first cutting portion 22, and a second cutting portion 24. Figure 3 In FIG. 1 , the cutting portion body 21 is shown as a structure within the region Q1, and the first cutting portion 22 is in the region Q2. Figure 3 The structure in the region Q2 and the region Q3 is shown in FIG.

[0048] The cutting portion body 21 is in the shape of a hollow tube, with the proximal end fixedly disposed in the handle.

[0049] The first cutting portion 22 includes a first half pipe portion 221. Figure 3 The structure in region Q2 is shown in FIG.

[0050] 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. 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" can mean that a complete hollow tubular structure is cut and processed at one end to form the desired combination form 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.

[0051] For example, Figure 4 As shown, the inner surface of the first half-tube portion 22 and the inner surface of the cutting portion body 21 are located on a first cylindrical surface, and the minimum distance between the inner surface of the second half-tube 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-tube portion 24 can be a cylindrical surface or an elliptical cylindrical surface.

[0052] This embodiment is based on the first half-tube being integrally formed with the cutting portion body. In other embodiments, when the second half-tube is integrally formed with the cutting portion body, the inner surface of the second half-tube 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-tubes and the inner surface of the cutting portion body are located on the first cylindrical surface S1, and the minimum distance between the inner surface of the first half-tube and the central axis of the cutting portion body is greater than the radius of the first cylindrical surface S1.

[0053] like Figure 5 As shown, 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 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) are separated from each other. Figure 3 The structures shown in Q3 and Q6 in the figure) are opened and closed during operation to achieve the resection of soft tissue.

[0054] like Figure 6 As shown, the push rod 28 of the tissue removal instrument is at least partially located in the cutting portion body 21 and extends coaxially with the cutting portion body 21. During operation, the push rod 28 can move axially relative to the cutting portion body 21, and the distal end of the push rod 28 can reach a position facing the inner surfaces of the first half-tube portion 221 and the second half-tube portion 241. At this time, as shown in FIG. 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 main body 21 is greater than the radius of the first cylindrical surface S1, and the push rod 28 extends coaxially with the cutting portion main 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.

[0055] 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 portion body 21 to be greater than the radius of the first cylindrical surface S1. The step portion forms a height difference between the inner surface of the cutting portion body 21 and 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, nor will it exceed the height of the inner surface of the cutting portion body 21, thereby effectively reducing or even eliminating the problem of obstruction of the movement of the pusher 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, thereby 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, which may affect secondary use.

[0056] The present application solves the problem of movement obstruction of the push rod 28 due to welding slag during the tissue pushing process 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 .

[0057] 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 is movable 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 the portion from the bending point N to the farthest end of the second cutting portion 24 (as shown in FIG. Figure 3(Structure Q6 is shown in the figure), the 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, with the focus of the angle being the bending point N. The spoon-shaped portion 242 includes a spoon portion and a long, straight spoon handle portion, which gradually deviates from the central axis from proximal to distal along the axial direction. The axial movement of the sleeve 26 squeezes the spoon handle portion, causing the distal end of the second cutting portion 24 to rotate about the bending point N. The sleeve 26 applies a certain pressure to the second cutting portion 24 to cause it to rotate about the bending point N. To promote a tighter closure between the first cutting portion 22 and the second cutting portion 24, thereby effectively cutting small and tough body tissues, the squeezing force applied to cause the second cutting portion 24 to rotate about the bending point N does not decrease until 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, then 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 will 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, resulting in reduced cutting efficiency.

[0058] To address this issue, the present invention provides for a second cutting portion having a thickness that is thinner than that of the first cutting portion. By designing the second cutting portion to have a thickness that is thinner than that of the first cutting portion, when the distal ends of the first and second cutting portions come into contact, the first cutting portion, due to its greater thickness, can possess greater rigidity to resist possible deformation of the distal end due to the pressure of the cannula. Furthermore, while maintaining the same material, a thinner thickness makes it easier to bend, thereby providing greater flexibility and labor-saving effects during cutting while ensuring cutting efficiency. This ensures the structural stability of the first cutting portion while improving the cutting performance of the second cutting portion, thereby achieving a more efficient cutting operation.

[0059] In an exemplary embodiment, Figure 3 and Figure 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 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 by 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 3Q5 area shown in FIG) and a combination of corresponding portions on the first cutting portion 22. The gap V has a uniform width.

[0060] Due to the formation of the gap V, when the second cutting portion 24 is driven by the sleeve 26 to bend, the stress on the second cutting portion 24 at the bending point N is the greatest, which can easily lead to plastic deformation of the second cutting portion 24 due to fatigue, resulting in a smaller opening angle between the first cutting portion 22 and the second cutting portion 24 at the distal end, affecting cutting efficiency. The present disclosure provides additional bending space for the second cutting portion 24 by providing the gap V. When the second cutting portion 24 is driven by the sleeve 26 to bend, the second cutting portion 24 is bent in the direction of the gap V, thereby reducing the stress generated by the second cutting portion 24 at the bending point N. This reduces or even eliminates the possibility of plastic deformation of the material of the second cutting portion 24.

[0061] In an exemplary embodiment, Figures 9-12 As shown, the width of the gap is W, the minimum distance from the inner surface of the second half-tube to the central axis is D, and the radius of the first cylindrical surface S1 is R, where W ≤ DR. This means that the width of the gap V is less than the radial height difference between the first cutting portion 22 and the second cutting portion 24. Because the first half-tube 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 less than the radial height difference between the first cutting portion 22 and the cutting portion body 21.

[0062] To ensure that the push rod 28 (indicated by the dashed line in the figure) can move freely in the axial direction, 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 must be greater than the diameter of the push rod 28. That is, when the second cutting portion 24 is bent toward the gap V and the bent portion abuts 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 must be greater than the diameter of the push rod 28. Because the diameter of the push rod 28 is less than or equal to the diameter of the first cylindrical surface S1, the radial height difference DR between the first half-tube portion 221 and the second half-tube portion 241 can be understood as the difference in distance from the inner surfaces of the first half-tube portion 221 and the second half-tube portion 241, respectively, to the push rod 28, that is, the difference in distance from the inner surfaces of the cutting portion body 21 and the second half-tube portion 241, respectively, to 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 will be 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 to which the inner surface of the second cutting portion 24 is raised cannot exceed the difference in distance from the inner surfaces of the cutting portion body 21 and the second cutting portion 24 to the push rod 28, respectively. Since the height to which the inner surface of the second cutting portion 24 is raised is determined by the width W of the gap V, the present disclosure sets the width W of the gap V to be ≤ DR, so that the height to which the inner surface of the second cutting portion 24 is raised will never exceed the difference in distance from the inner surfaces of the cutting portion body 21 and the second cutting portion 24 to the push rod 28, respectively, thereby ensuring that the push rod 28 can move freely in the axial direction.

[0063] In an exemplary embodiment, Figure 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, 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, and the surface is flat and smooth. When the tissue excision portion is inserted into the patient's body, the flat and smooth surface can greatly prevent unnecessary harm to the patient.

[0064] In an exemplary embodiment, Figure 14As shown, on the outer surface of the tissue resection portion, a first groove G1 is formed at the connection position between the second cutting portion 24 and the cutting portion body 21, and a second groove G2 is formed at the connection position between 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 a smooth and flat surface. 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.

[0065] In an exemplary embodiment, Figure 15 As shown, the first cutting portion 22 has a first blade surface F1, and the second cutting portion 24 has a second blade surface F2. When the first cutting portion 22 and the second cutting portion 24 are closed, the first blade surface F1 and the second blade surface F2 are tightly abutted. The first blade surface F1 and the second blade surface F2 have the same inclination angle relative to the axis of the cutting portion body 21. The blade surface width of the first blade surface F1 is greater than the blade surface width of the second blade surface F2. The so-called "blade surface width" refers to the size of the blade surface in the axial direction.

[0066] Existing cutting methods generally use a method where the blade faces face each other, similar to cutting meat on a chopping board. This cutting method can achieve relatively high cutting efficiency. However, during surgical resection, especially when cutting spinal soft tissue, even the slightest overcutting can cause unimaginable harm to the patient. In existing methods where the blade faces face each other, cutting does not only occur when the cutting blade moves toward the cutting surface; instead, the sharp edge of the cutting blade begins cutting as soon as it contacts the soft tissue. This can result in inadvertent or excessive cutting of the soft tissue. To avoid the aforementioned problems and injuries, the present disclosure proposes that the first and second blade faces are closely abutted, achieving resection of the target soft tissue by increasing pressure. The traditional sharp blade edge is replaced with a relatively blunt blade face to increase the contact area between the cutting blade and the soft tissue, reduce pressure, and avoid unwanted damage to the soft tissue. In this way, soft tissue cutting can only be achieved when the first cutting portion 22 and the second cutting portion 24 move relative to each other, and greater pressure is applied than in traditional cutting methods.

[0067] In an exemplary embodiment, the width of the second blade surface is greater than 0.1 mm.

[0068] In a third aspect, the present disclosure provides a method for processing a tissue excision portion, the method comprising providing a cutting portion body, the cutting portion body being in the shape of a hollow tube. Providing a first cutting portion, the first cutting portion comprising a first half-tube portion. Providing a second cutting portion, the second cutting portion comprising a second half-tube portion, welding the second half-tube portion to the first half-tube portion and / or the cutting portion body, the first half-tube portion and the second half-tube portion being in the shape of a hollow tube as a whole. Arranging 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 to lie on a first cylindrical surface S1, and setting 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 to be greater than the radius of the first cylindrical surface S1.

[0069] The inner surface of one of the first and second half-tube sections and the inner surface of the cutting section body can be positioned on the first cylindrical surface S1 by cutting a complete hollow cylindrical tube at one end, that is, integrally forming one of the first and second half-tube sections with the cutting section body to form the desired combined configuration of the cutting section body and the first cutting section. The other of the first and second half-tube sections can be formed by cutting a half-tubular portion from a complete hollow cylindrical tube or an elliptical tube along the central axis, and then machining the half-tubular portion. The minimum distance between the inner surface of the half-tube section and the central axis of the cutting section body (e.g., 1 / 2 of the minor axis of the elliptical cross-section) is greater than the distance between the inner surface of the cutting section body and the axis of the cutting section body.

[0070] 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 portion, used in a tissue removal instrument, characterized in that: The tissue resection portion includes: A cutting portion body, wherein the cutting portion 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 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, wherein: 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, wherein: The first half-tube portion and the second half-tube 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. In the connecting section, the first half-tube portion and the second half-tube portion are welded, and in the spacing section, a gap is formed between the first cutting portion and the second cutting portion.

4. The tissue resection portion according to claim 3, wherein: 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, wherein: The cutting portion body, the first half-tube portion, and the second half-tube portion are located on a second cylindrical surface.

6. The tissue resection portion according to claim 5, wherein: 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, wherein: 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.

8. The tissue resection portion according to claim 7, wherein: 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 according to claims 1 to 8, a cannula, which is sheathed on the outside of the tissue resection portion; The operating part includes a handle, a control trigger, and a gear-rack transmission mechanism built into the handle. The gear-rack transmission converts the movement of the control trigger into axial movement of the cannula, 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 portion body, wherein the cutting portion 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 includes a second half-tube portion, and the second half-tube portion is welded to the first half-tube portion and the cutting portion body, wherein the first half-tube portion and the second half-tube 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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