Puncture needle for prostate suspension apparatus and prostate suspension apparatus
By optimizing the blade structure and curvature design of the puncture needle, the problems of high puncture resistance and tissue damage in the prior art are solved, and lower resistance and safer puncture effects are achieved.
Patent Information
- Application Number
- CN202510580045.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2025-07-04
AI Technical Summary
The geometric design of the existing puncture needles is unreasonable, resulting in high puncture resistance, which can easily cause prostate capsule tear and unexpected tissue damage.
A puncture needle is designed, with its edge structure including three blade faces and three blade edges. The needle tip is responsible for puncture of the prostate capsule, the first and second blade edges are responsible for cutting, the third blade edge enhances strength, the transition surface optimizes the puncture smoothness, and a small curvature angle design is used to avoid accidentally damaging the surrounding tissue.
Reduces puncture resistance, reduces tissue damage, and improves the convenience and safety of operation.
Smart Images
Figure CN120241207A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of medical devices, and particularly to a puncture needle for a prostate suspension device and a prostate suspension device. Background Art
[0002] As a minimally invasive surgical procedure for treating benign prostatic hyperplasia, the core technology of prostate suspension lies in achieving mechanical remodeling of prostate tissue through the implantation of an anchoring system within the urethra. Most of the existing suspension devices in clinical applications adopt an implementation scheme of a "worker" - shaped support structure formed by double anchor points and connecting lines. Its core components include a delivery system with a puncture function and an anchor assembly composed of a distal anchor, a connecting line, and a proximal anchor. However, there are significant technical bottlenecks in the design of the key puncture mechanism in the existing technical solutions in this field: Firstly, the geometric structure design of the blade part of the existing puncture needle is unreasonable, resulting in a relatively high puncture resistance coefficient. The tissue extrusion force of the traditional flat - ground blade edge can reach 12 - 15 N when penetrating the prostate capsule, which not only increases the operating load of the operator but also easily causes capsule tearing due to the puncture tremor effect. Secondly, the curvature radius of the delivery needle body and the design of the lateral support structure are not good. During the retrograde puncture through the urethra, the needle body is prone to unexpected axial deflection, leading to accidental injury to the bladder wall muscle layer or pelvic fascia. Summary of the Invention
[0003] In view of the above - mentioned disadvantages of the existing technology, the purpose of the present invention is to provide a puncture needle for a prostate suspension device and a prostate suspension device, which are used to solve the problem that the geometric structure design of the blade part of the puncture needle in the existing technology is unreasonable, resulting in a high puncture resistance.
[0004] To achieve the above - mentioned purpose, the first aspect of the present invention provides a puncture needle for a prostate suspension device, including a puncture needle tube body; one end of the puncture needle tube body has a puncture part, and the puncture part includes: A first blade surface, which forms a first blade edge at the junction with the outer surface of the puncture needle tube body; A second blade surface, which forms a second blade edge at the junction with the outer surface of the puncture needle tube body; A transition surface, which is connected to the first blade surface and the second blade surface; A third blade edge is formed at the junction of the first blade surface and the second blade surface, and the first blade edge, the second blade edge, and the third blade edge converge to form a needle tip; It is set that the plane passing through the central axis of the puncture needle tube body and the vertex of the needle tip is the central section, and the included angle b between the projection line of the transition surface in the central section and the outer tangent line of the puncture needle tube body at the needle tip satisfies: 14° ≤ b ≤ 22°.
[0005] Preferably, the included angle c between the first blade surface and the second blade surface satisfies: 85° ≤ c ≤ 95°.
[0006] Preferably, the transition surface is an arc surface. Define the first cross-section as a plane passing through the midpoint of the arc of the outer contour line of the transition surface and perpendicular to the central axis of the puncture needle tube body. The axial distance L1 from the tip vertex to the first cross-section satisfies: 1.5 mm ≤ L1 ≤ 5 mm.
[0007] Preferably, the puncture needle tube body includes a straight tube section and a bent tube section extending along the central axis. The puncture part is located at the end of the bent tube section. The central axis of the bent tube section has a constant radius of curvature R, and 20 mm ≤ R ≤ 40 mm. The farthest vertical distance L2 from the outer contour line of the projection of the bent tube section in the central cross-section to the plane where the end face of the straight tube section is located satisfies 50 mm ≤ L2 ≤ 60 mm. The vertical distance H from the needle tip to the outer contour line of the projection of the straight tube section in the central cross-section satisfies 30 mm ≤ H ≤ 40 mm. The end face of the straight tube section is perpendicular to the central axis of the straight tube section, and the angle a between the transition surface and the plane where the end face of the straight tube section is located satisfies 0° ≤ a ≤ 20°.
[0008] Preferably, it further includes: A distal anchor, slidably arranged inside the puncture needle tube body; A connecting line, partially passing through the inside of the puncture needle tube body and connected to the distal anchor; A fourth cutting edge is formed at the junction of the transition surface and the inner tube wall of the puncture needle tube body. The fourth cutting edge is a symmetric arc structure, and an arc-shaped blunt part is provided in the middle of the bottom of the arc structure.
[0009] Preferably, it further includes a needle fixing seat. An installation part is provided at one end of the puncture needle tube body away from the puncture part. The needle fixing seat is connected to the installation part and fixed by an adhesive.
[0010] Preferably, the needle fixing seat is a tubular structure, including a tube body and a tube cavity. One end of the tube body has a joining cavity, and the joining cavity is coaxially arranged with the tube cavity and communicates with each other. The installation part is inserted into the joining cavity. The tube body corresponding to the joining cavity is radially provided with an adhesive hole, and the adhesive hole at least penetrates one side wall of the tube body.
[0011] Preferably, the inner diameter of the joining cavity is larger than the inner diameter of the tube cavity. A limiting end face is provided at one end of the joining cavity away from the insertion opening, and the limiting end face contacts the end face of the installation part to limit the installation part.
[0012] Preferably, the surface roughness Ra of the installation part is greater than 6.3.
[0013] In the second aspect of the present invention, a prostate suspension device is provided, including: a puncture needle for a prostate suspension device as described in the first aspect of the present invention.
[0014] The beneficial effects of the present invention are as follows: The puncture needle for a prostate suspension instrument provided by the present invention has a blade structure at its puncture part, which includes three blade surfaces, three blade edges, and a needle tip. Among them, the needle tip is responsible for piercing the epidermis of the prostate capsule, the first blade edge and the second blade edge are mainly responsible for the cutting effect during the puncture process, and the third blade edge connects the first blade surface and the second blade surface to enhance the overall strength. The design of the transition surface can improve the smoothness during puncture and reduce tissue damage. This structure has a lower puncture resistance compared to the traditional flat-ground blade edge. Further, the puncture needle of the present invention adopts a smaller bending angle design in its outer shape, which can effectively avoid accidentally injuring other body tissues around the prostate capsule during the puncture process. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the puncture needle for a prostate suspension instrument according to an embodiment of the present invention; Figure 2 It is a front view of the needle tube body of the puncture needle according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the puncture part of the needle tube body of the puncture needle according to an embodiment of the present invention Figure 1 ; Figure 4 It is a schematic diagram of the structure of the puncture part of the needle tube body of the puncture needle according to an embodiment of the present invention Figure 2 ; Figure 5 It is a front view of the puncture part of the needle tube body of the puncture needle according to an embodiment of the present invention; Figure 6 It is a schematic diagram of a partial structure of the distal end of the central axis assembly of a prostate suspension instrument in the prior art; Figure 7 It is a display of the posture of the needle tube body of the puncture needle after passing through the needle outlet according to an embodiment of the present invention; Figure 8 It is a display of the posture of the needle tube body of the puncture needle after passing through the needle outlet when the straight tube part of the needle tube body of the puncture needle presents different angles with the reference line according to an embodiment of the present invention; Figure 9 It is a schematic diagram of the posture comparison of the needle tube bodies of puncture needles with different curvature radii after passing through the needle outlet; Figure 10 It is a schematic diagram of the parameter marking of the needle tube body of the puncture needle according to an embodiment of the present invention; Figure 11 It is a half-sectional view of the needle tube body of the puncture needle according to an embodiment of the present invention; Figure 12 It is Figure 11 The enlarged view at B in Figure 13 It is Figure 1 The enlarged view at A in
[0016] Reference numerals: 1 - puncture needle tube body; 11 - puncture part; 111 - first cutting edge surface; 112 - second cutting edge surface; 113 - transition surface; 114 - first cutting edge; 115 - second cutting edge; 116 - third cutting edge; 117 - needle tip; 118 - fourth cutting edge; 1181 - two - side cutting edge segments; 1182 - bottom middle segment; 119 - arc - shaped blunt part; 12 - central axis; 13 - central cross - section; 14 - mounting part; 15 - first cross - section; 16 - straight pipe segment; 17 - bent pipe segment; 171 - outer contour line; 172 - inner contour line; 2 - needle fixing seat; 21 - tube body; 22 - lumen; 23 - joint cavity; 24 - bonding hole; 25 - limiting end face; 3 - distal anchor; 31 - connecting line; 4 - needle outlet; 41 - needle outlet center line; 42 - reference line. Detailed implementation manners
[0017] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meaning understood by those of ordinary skill in the art to which the present invention pertains. The words such as "including" used herein mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The "connection" described herein, unless otherwise specified, can be a direct connection or an indirect connection, that is, a connection through an intermediate object.
[0018] Refer to Figure 1 , the first aspect of the present invention provides a puncture needle for a prostate suspension instrument, including a puncture needle tube body 1 and a needle fixing seat 2, the puncture needle is fixedly connected to the needle fixing seat 2; a distal anchor 3 is arranged inside the puncture needle tube body 1, and the needle fixing seat 2 moves under the action of the delivery system of the prostate suspension instrument and drives the puncture needle to pierce the prostate capsule to deliver and arrange the distal anchor 3.
[0019] Refer to Figure 2 and Figure 3 , wherein, Figure 2 shows a side view of the puncture needle tube body 1, Figure 3 shows Figure 2Three-dimensional enlarged view of the middle puncture part 11. One end of the puncture needle tube body 1 has a puncture part 11, and the puncture part 11 includes: a first blade surface 111, a second blade surface 112, and a transition surface 113; wherein, a first blade edge 114 is formed at the junction of the first blade surface 111 and the outer surface of the puncture needle tube body 1; a second blade edge 115 is formed at the junction of the second blade surface 112 and the outer surface of the puncture needle tube body 1; the transition surface 113 is connected to the first blade surface 111 and the second blade surface 112; a third blade edge 116 is formed at the junction of the first blade surface 111 and the second blade surface 112; the first blade edge 114, the second blade edge 115, and the third blade edge 116 converge to form a needle tip 117.
[0020] In this embodiment, the blade structure of the puncture part 11 includes three blade surfaces (the first blade surface 111, the second blade surface 112, and the transition surface 113), three blade edges, and a needle tip 117. Among them, the needle tip 117 is responsible for piercing the epidermis of the prostate capsule, and the first blade edge 114 and the second blade edge 115 are responsible for the main cutting effect during the puncture process, while the third blade edge 116 connects the first blade surface 111 and the second blade surface 112 to enhance the overall strength. The design of the transition surface 113 can improve the smoothness during puncture and reduce tissue damage. This structure has a lower puncture resistance compared to the traditional flat-ground blade edge.
[0021] Comprehensively referring to Figure 3 、 Figure 4 and Figure 5 For more convenient expression, a central section 13 is set as the plane passing through the central axis 12 of the puncture needle tube body 1 (as shown by the dotted line in Figure 3 、 Figure 4 and Figure 5 ) and the vertex of the needle tip 117. The included angle b between the projection line of the transition surface 113 in the central section 13 and the outer tangent line of the puncture needle tube body 1 at the needle tip 117 satisfies: 14° ≤ b ≤ 22°. Experimental data (see Data Table 1) shows that if the setting of the included angle b exceeds this range, the puncture resistance will increase. In this embodiment, the limitation of the included angle b optimizes the puncture angle, thereby reducing the puncture resistance.
[0022] Referring to Figure 3 , in some embodiments, the included angle c between the first blade surface 111 and the second blade surface 112 satisfies: 85° ≤ c ≤ 95°. The preferred range of the included angle c is 88° ≤ c ≤ 92° Data Table 1 shows the influence of different included angles b and included angles c on the puncture resistance of the puncture needle
[0023] Data Table 1 Referring to Figure 2 、 Figure 4, in some embodiments, the transition surface 113 is an arc surface. Define the first cross-section 15 as a plane passing through the midpoint of the arc of the outer contour line 171 of the transition surface 113 and perpendicular to the central axis of the puncture needle tube body 1; the axial distance L1 from the vertex of the needle tip 117 to the first cross-section 15 satisfies: 1.5 mm ≤ L1 ≤ 5 mm. The axial distance L1 is the length of the puncture portion 11, and the lengths of different puncture portions 11 affect the puncture resistance when the puncture needle punctures the prostate capsule.
[0024] Furthermore, the preferred range of the axial distance L1 is 2.5 mm ≤ L1 ≤ 3.5 mm. In this embodiment, the preferred value of the axial distance L1 is 3 mm. Data table 2 shows the influence of different axial distances L1 on the puncture resistance of the puncture needle:
[0025] Refer to Figure 2 , in some embodiments, the puncture needle tube body 1 includes an axially extending straight tube section 16 and a bent tube section 17; the puncture portion 11 is located at the end of the bent tube section 17; the radius of curvature R of the central axis of the bent tube section 17 not only affects the magnitude of the puncture resistance when the puncture needle punctures the prostate capsule, but when the radius of curvature R is too large, the puncture needle will also interfere with the tissues or bones near the prostate capsule during the puncture process, thereby causing damage. Therefore, in order to ensure that the puncture needle can complete the puncture work and avoid unnecessary damage, an appropriate angle should be selected for the radius of curvature.
[0026] Refer to Figure 6 , a needle outlet 4 is provided at the distal end of the shaft assembly, and the puncture needle penetrates through the needle outlet 4 during puncture. In order to facilitate the description of the influence of different radii of curvature R on the puncture effect of the puncture needle, a straight line passing through the center of the end face of the needle outlet 4 and perpendicular to the end face of the needle outlet 4 is defined as the needle outlet center line 41, and a straight line passing through the center of the end face of the needle outlet 4 and perpendicular to the needle outlet center line 41 is defined as the reference line 42. The needle outlet center line 41 and the reference line 42 are coplanar.
[0027] Refer to Figure 7 , after the puncture needle penetrates through the needle outlet 4, the greater the perpendicular distance h1 between the needle tip 117 and the needle outlet center line 41, the more likely the puncture needle is to interfere with the tissues or bones near the prostate capsule, resulting in damage to the nearby tissues or bones.
[0028] Refer to Figure 8 and Figure 9 , the angle θ between the straight tube section 16 and the reference line 42 also affects the magnitude of the perpendicular distance h1. Figure 8 shows the variation of the magnitude of h1 for puncture needles with the same radius of curvature R under different angles θ (0°, 10°, 20°, 40°). Figure 9The figure shows the variation of the size of h1 when the puncture needles with different curvature radii R (R1 < R2 < R3) are at different included angles θ. It can be intuitively seen that when the curvature radius is small, the tip 117 is closer to the needle exit center line 41 (that is, the tip 117 is closer to the operator's body side), and at this time, the puncture needle is less likely to accidentally injure the surrounding tissues.
[0029] Refer to Figure 10 , Figure 10 is the front view of the puncture needle tube body 1; the central axis of the bent tube section 17 has a constant curvature radius R, and 20 mm ≤ R ≤ 40 mm; further, the preferred range of R is 28 mm ≤ R ≤ 32 mm. In this embodiment, the preferred value of R is 30 mm. The reference data table 3 for the puncture resistance corresponding to different end values and preferred values.
[0030] Further, the inner contour line 172 of the projection of the bent tube section 17 in the central section 13 has a constant curvature radius r1, and 19 mm ≤ r1 ≤ 39 mm; the preferred range of the curvature radius r1 of the inner contour line 172 is 27 mm ≤ r1 ≤ 31 mm, and the preferred value of r1 is 29 mm. The outer contour line 171 of the projection of the bent tube section 17 in the central section 13 has a constant curvature radius r2, and 21 mm ≤ r2 ≤ 41 mm; the preferred range of the curvature radius r2 of the outer contour line 171 is 29 mm ≤ r1 ≤ 33 mm; the preferred value of r2 is 31 mm. The reference data table 3 for the puncture resistance corresponding to different end values and preferred values.
[0031] The farthest vertical distance L2 from the outer contour line 171 to the plane where the end face of the straight tube section 16 is located satisfies 50 mm ≤ L2 ≤ 60 mm; L2 represents the total lateral length of the puncture needle tube body 1. The preferred range of L2 is 53 mm ≤ L2 ≤ 57 mm, and the preferred value is 55 mm. The reference data table 3 for the puncture resistance corresponding to different end values and preferred values.
[0032] The vertical distance H from the tip 117 to the outer contour line 171 of the projection of the straight tube section 16 in the central section 13 satisfies 30 mm ≤ H ≤ 40 mm; the preferred range of the vertical distance H is 34 mm ≤ H ≤ 38 mm, and the preferred value is 36 mm. The reference data table 3 for the puncture resistance corresponding to different end values and preferred values.
[0033] The end face of the straight tube section 16 is perpendicular to the central axis of the straight tube section 16, and the included angle a between the transition surface 113 and the plane where the end face of the straight tube section 16 is located satisfies 0° ≤ a ≤ 20°. The preferred range of the included angle a is 3° ≤ a ≤ 7°, and the preferred value is 5°. The reference data table 3 for the puncture resistance corresponding to different end values and preferred values.
[0034]
[0035] Reference Figure 1 , in some embodiments, the puncture needle further includes a distal anchor 3 and a connecting line 31; wherein, the distal anchor 3 is slidably disposed inside the puncture needle tube body 1; a part of the connecting line 31 is disposed inside the puncture needle tube body 1 and is connected to the distal anchor 3; Reference Figure 4 、 Figure 11 and Figure 12 , a fourth cutting edge 118 is formed at the junction of the transition surface 113 and the inner tube wall of the puncture needle tube body 1. The fourth cutting edge 118 is a symmetric arc structure. The arc structure includes two side cutting edge segments 1181 and a bottom middle segment 1182. An arc-shaped blunt portion 119 with a radius of r3 is provided on the bottom middle segment 1182 (such as Figure 4 ), and r3≥0.02 mm. In this embodiment, the setting of the arc-shaped blunt portion 119 can effectively prevent the connecting line 31 from being cut by the fourth cutting edge 118 during the movement in the puncture needle tube body 1.
[0036] In this embodiment, the arc-shaped blunt portion 119 is formed by melting the bottom middle segment 1182 of the arc structure at high temperature through a laser welding process.
[0037] In some embodiments, the arc-shaped blunt portion 119 is formed by mechanical processing, such as grinding the bottom middle segment 1182 of the arc structure to form the arc-shaped blunt portion 119.
[0038] Please refer to Figure 1 and Figure 13 , in some embodiments, an installation portion 14 is provided at one end of the puncture needle tube body 1 away from the puncture portion 11. The needle fixing seat 2 is connected to the installation portion 14 and fixed by an adhesive. Further, the needle fixing seat 2 is a tubular structure, including a tube body 21 and a tube cavity 22. One end of the tube body 21 has a joint cavity 23. The joint cavity 23 is coaxially arranged with the tube cavity 22 and communicates with each other. The installation portion 14 is inserted into the joint cavity 23; A bonding hole 24 is radially opened in the tube body 21 corresponding to the joint cavity 23. The bonding hole 24 at least penetrates one side wall of the tube body 21. By providing the bonding hole 24 on the tube body 21 and coating the adhesive at the bonding hole 24, the adhesive contacts both the needle fixing seat 2 and the tube body 21 exposed at the bonding hole 24, realizing the fixation of the needle fixing seat 2 and the tube body 21. If the bonding hole 24 is not provided, it is necessary to coat the adhesive on the inner wall of the tube cavity 22, which is obviously more cumbersome to operate. Therefore, the setting of the bonding hole 24 makes the coating of the adhesive more convenient.
[0039] In this embodiment, two of the bonding holes 24 are radially formed in the tube body, and the bonding holes 24 penetrate through both side walls of the tube body. Therefore, there are four bonding positions between the mounting portion 14 and the tube body, which can effectively improve the connection reliability between the puncture needle tube body 1 and the needle fixing base 2.
[0040] In some embodiments, the inner diameter of the engaging cavity 23 is larger than that of the lumen. A limiting end face 25 is provided at one end of the engaging cavity 23 away from the insertion inlet, and the limiting end face 25 contacts the end face of the mounting portion 14 to limit the mounting portion 14.
[0041] In some embodiments, the surface roughness Ra of the mounting portion 14 is greater than 6.3. When the surface roughness Ra of the mounting portion 14 is greater than 6.3, the friction between the mounting portion 14 and the inner wall of the engaging cavity 23 can be effectively increased, thereby improving the connection stability between the two. In this embodiment, the effect of the surface roughness Ra being greater than 6.3 can be achieved by a sandblasting process.
[0042] The second aspect of the present invention provides a prostate suspension instrument, which employs the puncture needle for a prostate suspension instrument as described in the first aspect of the present invention.
[0043] The prostate suspension instrument includes a handle and a cartridge. The cartridge can be firmly inserted into the cartridge chamber. The handle includes a mechanical energy source that is transmitted to the cartridge to deploy an anchor assembly housed in the cartridge. The puncture needle is installed in the cartridge and performs a puncture action under the drive of the mechanical energy source.
[0044] In summary, the puncture needle for a prostate suspension instrument provided by the present invention has an innovative design for the structure of the puncture needle. Specifically, the blade structure of the puncturing portion of the puncture needle includes three blade surfaces, three blade edges, and a needle tip. Among them, the needle tip is responsible for piercing the epidermis of the prostate capsule, and the first blade edge and the second blade edge are mainly responsible for cutting during the puncture process, while the third blade edge connects the first blade surface and the second blade surface to enhance the overall strength. The design of the transition surface can improve the smoothness during puncture and reduce tissue damage. This structure has a lower puncture resistance compared to the traditional flat-ground blade edge. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.
[0045] As mentioned above, the above is only the specific implementation manner of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of the present application should be covered by the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claims.
Claims
1. A puncture needle for a prostate suspension instrument, characterized in that, It includes a puncture needle tube body; one end of the puncture needle tube body has a puncture part, and the puncture part includes: A first cutting edge surface, at the junction with the outer surface of the puncture needle tube body forms a first cutting edge; A second cutting edge surface, at the junction with the outer surface of the puncture needle tube body forms a second cutting edge; A transition surface, connecting the first cutting edge surface and the second cutting edge surface; A third cutting edge is formed at the junction of the first cutting edge surface and the second cutting edge surface, and the first cutting edge, the second cutting edge and the third cutting edge converge to form a needle tip; Set the plane passing through the central axis of the puncture needle tube body and the vertex of the needle tip as the central section, and the included angle b between the projection line of the transition surface in the central section and the outer tangent line of the puncture needle tube body at the needle tip satisfies: 14° ≤ b ≤ 22°.
2. The puncture needle for a prostate suspension device according to claim 1, wherein: The included angle c between the first cutting edge surface and the second cutting edge surface satisfies: 85° ≤ c ≤ 95°.
3. The puncture needle for a prostate suspension instrument according to claim 1, wherein: The transition surface is an arc surface. Define the first cross-section as the plane passing through the midpoint of the arc of the outer contour line of the transition surface and perpendicular to the central axis of the puncture needle tube body; the axial distance L1 from the vertex of the needle tip to the first cross-section satisfies: 1.5 mm ≤ L1 ≤ 5 mm.
4. The puncture needle for a prostate suspension device according to claim 1, characterized in that: The puncture needle tube body includes a straight tube section and a bent tube section extending along the central axis; the puncture part is located at the end of the bent tube section; The central axis of the bent tube section has a constant radius of curvature R, and 20 mm ≤ R ≤ 40 mm; The farthest vertical distance L2 from the outer contour line of the projection of the bent tube section in the central section to the plane where the end face of the straight tube section is located satisfies 50 mm ≤ L2 ≤ 60 mm; The vertical distance H from the needle tip to the outer contour line of the projection of the straight tube section in the central section satisfies 30 mm ≤ H ≤ 40 mm; The end face of the straight tube section is perpendicular to the central axis of the straight tube section, and the included angle a between the transition surface and the plane where the end face of the straight tube section is located satisfies 0° ≤ a ≤ 20°.
5. The puncture needle for a prostate suspension instrument according to claim 1, wherein: It further includes: A distal anchor, slidably arranged inside the puncture needle tube body; A connecting line, partially passing through the inside of the puncture needle tube body and connected to the distal anchor; A fourth cutting edge is formed at the junction of the transition surface and the inner tube wall of the puncture needle tube body. The fourth cutting edge is a symmetric arc structure, and an arc-shaped blunt part is provided in the middle of the bottom of the arc structure.
6. The puncture needle for a prostate suspension instrument according to claim 1, characterized in that: It further includes a needle fixing seat; One end of the puncture needle tube body away from the puncture part is provided with an installation part, and the needle fixing seat is connected to the installation part and fixed by an adhesive.
7. The trocar for a prostate suspension instrument according to claim 6, characterized in that: The needle fixing seat is a tubular structure, including a tube body and a tube cavity. One end of the tube body has a joint cavity, and the joint cavity is coaxially arranged with the tube cavity and communicates with each other. The installation part is inserted into the joint cavity; The tube body corresponding to the joint cavity is radially provided with an adhesive hole, and the adhesive hole at least penetrates one side wall of the tube body.
8. The puncture needle for a prostate suspension instrument according to claim 7, wherein: The inner diameter of the joint cavity is larger than the inner diameter of the tube cavity. A limiting end face is provided at one end of the joint cavity away from the insertion entrance, and the limiting end face contacts the end face of the installation part to limit the installation part.
9. The puncture needle for a prostate suspension instrument according to claim 8, characterized in that: The surface roughness Ra of the installation part is greater than 6.
3.
10. A prostate suspension device, characterized in that, It includes: The puncture needle for a prostate suspension instrument according to any one of claims 1-9.