Medical trephine

Abstract

The application discloses a medical ring saw and relates to the technical field of medical devices. The ring saw body is a hollow tubular structure. A saw tooth is annularly arranged at one end of the ring saw body along the wall of the ring saw body. The saw tooth comprises high teeth and low teeth. The high teeth and the low teeth are arranged in a staggered manner. The tooth top of the high teeth is 0.1mm-0.30mm higher than that of the low teeth. The saw tooth is provided with a cutting edge and a facing-away surface. The facing-away surface is arranged in parallel with the central axis of the ring saw body. The intersection of the cutting edge and the facing-away surface is the tooth top. The included angle formed by the cutting edge and the facing-away surface is a cutting angle. In the cutting process, the high teeth first contact and cut the tissue, and the low teeth follow up to perform secondary cutting and rest. This progressive cutting mode can reduce the tearing and damage to the surrounding tissue, make the wound more neat, reduce the resistance during cutting and make the cutting process more smooth. The cooperation of the high teeth and the low teeth increases the number of the saw teeth. By regulating the height difference between the tooth top of the high teeth and that of the low teeth, the cooperation of the high teeth and the low teeth is more smooth.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a medical ring saw. Background Technology

[0002] Spinal surgery is a general term for various surgical procedures performed on the spine and surrounding tissues, aiming to treat spinal diseases, correct spinal deformities, relieve pain, and restore spinal function. For example, a common procedure is discectomy, which removes the herniated disc tissue to reduce pressure on nerve roots and relieve symptoms such as pain and numbness.

[0003] In existing technologies, straight-toothed ring saws are generally used to cut and shape the disc for discectomy.

[0004] Regarding the aforementioned technologies, the inventors believe that straight-tooth ring saws have a slow cutting speed in some hard solid tissues, especially when bone density is high, which delays surgical time. Utility Model Content

[0005] The purpose of this application is to provide a medical trephine saw to improve the problem that straight-tooth trephine saws have a slow cutting speed in some hard solid tissues, especially when bone density is high, which delays the operation time.

[0006] This application provides a medical ring saw, which adopts the following technical solution:

[0007] A medical ring saw includes a ring saw body, which is a hollow tubular structure. One end of the ring saw body is provided with serrations along the side wall of the ring saw body. The serrations include high teeth and low teeth, which are staggered. The tip of the high teeth is 0.1mm-0.30mm higher than the tip of the low teeth.

[0008] By adopting the above technical solution, with high and low teeth arranged alternately, during the cutting process, the high teeth first contact and cut the tissue, while the low teeth follow up with secondary cutting and trimming. This progressive cutting method can reduce tearing and damage to surrounding tissues, making the wound neater, and at the same time, it can reduce the resistance during cutting, making the cutting process smoother. In addition, the cooperation between high and low teeth increases the number of saw teeth, and the coordinated work of high and low teeth can quickly cut tissue, improving surgical efficiency. By specifying the height difference between the tips of the high and low teeth, the cooperation between the high and low teeth is made smoother.

[0009] Optionally, the saw teeth are provided with a cutting edge and a back surface. The back surface is arranged parallel to the central axis of the ring saw body. The intersection of the cutting edge and the back surface is the tooth tip. The included angle formed by the cutting edge and the back surface is the cutting angle, which is 5°-20°.

[0010] By adopting the above technical solution and setting a cutting angle of 5°-20°, the saw teeth can contact the tissue at a smaller angle during the cutting process, thereby reducing the resistance during cutting, making the cutting process smoother, reducing tearing and damage to the tissue during cutting, and improving cutting efficiency. This design also makes the operation of the ring saw simpler, requiring less force, reducing surgical risks, and allowing doctors to control the ring saw more easily during surgery, reducing the possibility of accidental injury.

[0011] Optionally, a transition surface is provided between the roots of adjacent serrations.

[0012] By adopting the above technical solution, the gap between the saw teeth is increased by setting a transition surface, which is conducive to heat dissipation and reduces the heat generated by friction, thereby reducing thermal damage to the surrounding healthy tissues. The saw teeth are subjected to stress during the cutting process. By setting a transition surface to distribute the stress, the strength of the saw tooth root is improved and the service life of the ring saw body is increased.

[0013] Optionally, the transition surface is a plane, and the transition surface is inclined at an angle to the straight axis of the ring saw body, the inclination angle being 30°-60°.

[0014] By adopting the above technical solution, and by setting a planar transition surface, the transition surface between the saw teeth is made smoother while distributing the cutting stress, thus reducing the frictional resistance during the cutting process. By setting an inclination angle, the transition surface has a certain guiding function. During the rotational cutting process, under the following of the inclined transition surface and the compression of the cut tissue, the ring saw body is more likely to maintain a straight cutting motion, which facilitates operation and improves surgical accuracy.

[0015] Optionally, the transition surface is set perpendicular to the cutting edge surface.

[0016] By adopting the above technical solution, and by setting the transition surface to be perpendicular to the cutting edge, the stability of the transition surface and the support force on the cutting edge are improved. The cutting edge is more stable and firm during the rotary cutting process, which helps to improve the service life of the ring saw body.

[0017] Optionally, the serrated surface is provided with a titanium nitride coating.

[0018] By adopting the above technical solution, the high hardness of titanium nitride gives it excellent wear resistance, which can significantly extend the service life of the ring saw body. When cutting hard tissues such as bone, the titanium carbide coating can maintain cutting efficiency with less wear on the saw teeth. In addition, the low coefficient of friction of titanium nitride reduces frictional resistance during the cutting process, making the cutting smoother and reducing operator fatigue.

[0019] Optionally, a handle is connected to the end of the ring saw body away from the saw teeth. The handle has an insertion hole for inserting the ring saw body and a pair of handles.

[0020] By adopting the above technical solution, the ring saw is stabilized by setting a handle to limit the position of the ring saw body during use, preventing the ring saw body from slipping, setting a hole for the ring saw body to be inserted and fixed, and setting a handle to facilitate manual holding of the handle to maintain its stability.

[0021] Optionally, a sleeve concentric with the socket is provided on one side of the handle, and the inner diameter of the sleeve is the same as the diameter of the socket.

[0022] By adopting the above technical solution and setting a sleeve concentric with the insertion hole, the handle's ability to limit the ring saw body is further improved.

[0023] Optionally, one end of the sleeve is provided with a plurality of insert blocks, the outer circumference of the insertion hole is provided with a plurality of through holes corresponding to the insert blocks, and the side of the handle away from the sleeve is provided with a fixing ring, the fixing ring being provided with a fixing hole corresponding to the insert block.

[0024] By adopting the above technical solution, the insert block passing through the insertion hole is fixed by setting a fixing ring to fix the sleeve; at the same time, it is easy to disassemble and replace different sleeves, and it is easy to replace the sleeve for different usage scenarios, so that the sleeve can better cooperate with and stabilize the ring saw body.

[0025] Optionally, an anti-loosening elastic element is provided inside the fixing hole.

[0026] By adopting the above technical solution, the sleeve is stabilized by setting anti-loosening elastic elements to prevent it from falling off.

[0027] In summary, this application includes at least one of the following beneficial technical effects of medical trephine:

[0028] 1. The high and low teeth are arranged alternately. During the cutting process, the high teeth first contact and cut the tissue, while the low teeth follow up with secondary cutting and trimming. This progressive cutting method can reduce tearing and damage to surrounding tissues, resulting in a cleaner wound. At the same time, it can reduce the resistance during cutting, making the cutting process smoother. In addition, the combination of high and low teeth increases the number of saw teeth, and the coordinated work of high and low teeth can quickly cut tissue, improving surgical efficiency. By specifying the height difference between the tips of the high and low teeth, the cooperation between the high and low teeth is made smoother.

[0029] 2. By setting a cutting angle of 5°-20°, the saw teeth can contact the tissue at a smaller angle during the cutting process, thereby reducing the resistance during cutting, making the cutting process smoother, reducing tearing and damage to the tissue during cutting, and improving cutting efficiency. This design makes the operation of the ring saw simpler, requiring less force, reducing surgical risks, and allowing doctors to control the ring saw more easily during surgery, reducing the possibility of accidental injury.

[0030] 3. By setting a planar transition surface, the cutting stress is distributed while the transition surface between the saw teeth is smoother, reducing the frictional resistance during the cutting process; by setting an inclination angle, the transition surface has a certain guiding function. During the rotational cutting process, under the follow-up of the inclined transition surface and the compression of the cut tissue, the ring saw body is more likely to maintain a straight cutting motion, which is convenient for operation and improves surgical accuracy. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the ring saw body structure.

[0032] Figure 2 This is a cross-sectional schematic diagram of the ring saw body structure.

[0033] Figure 3 This is a schematic diagram of the top surface structure of the ring saw.

[0034] Figure 4 This is a schematic diagram illustrating the sleeve structure in the embodiment.

[0035] Figure 5 yes Figure 4 An enlarged schematic diagram of the structure at point A in the middle.

[0036] In the diagram, 1. Ring saw body; 2. Saw teeth; 21. High tooth; 22. Low tooth; 3. Cutting edge; 4. Back face; 5. Cutting angle; 6. Transition surface; 7. Inclined angle; 8. Handle; 81. Handle; 82. Insertion hole; 83. Sleeve; 9. Insertion block; 10. Through hole; 11. Retaining ring; 12. Retaining hole; 13. Anti-loosening elastic element. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0038] A medical trephine, reference Figure 1 , Figure 2 , Figure 3The ring saw body 1 is a hollow tubular structure. A ring of saw teeth 2 is arranged in a ring along the side wall of the ring saw body 1 at one end. The saw teeth 2 include high teeth 21 and low teeth 22, which are staggered. The tip of the high teeth 21 is 0.1mm-0.30mm higher than the tip of the low teeth 22. Each saw tooth 2 has a cutting edge 3 and a back surface 4. The back surface 4 is parallel to the central axis of the ring saw body 1. The intersection of the cutting edge 3 and the back surface 4 is the tooth tip. The angle formed by the cutting edge 3 and the back surface 4 is the cutting angle 5, which is 5°-20°. A transition surface 6 is provided between the roots of adjacent saw teeth 2. The transition surface 6 is a plane and perpendicular to the cutting edge 3. The transition surface 6 is inclined at an angle 7 to the straight axis of the ring saw body 1, which is 30°-60°, specifically 45°. A titanium nitride coating is applied to the surface of the saw teeth 2 by sputtering in physical vapor deposition.

[0039] Reference Figure 4 , Figure 5 A handle 8 is connected to the end of the ring saw body 1 away from the saw teeth 2. The handle 8 has a pair of handles 81. The center of the handle 8 has an insertion hole 82 for the ring saw body 1 to be inserted. A sleeve 83 concentric with the insertion hole 82 is provided on one side of the handle 8. The inner diameter of the sleeve 83 is the same as the diameter of the insertion hole 82. Several insert blocks 9 are provided at one end of the sleeve 83. Several through holes 10 corresponding to the insert blocks 9 are provided on the outer circumference of the insertion hole 82. A fixing ring 11 is provided on the side of the handle 8 away from the sleeve 83. The center of the fixing ring 11 has a hole that matches the insertion hole 10 so that the ring saw body 1 can pass through. The fixing ring 11 has a fixing hole 12 corresponding to the insert block 9. An anti-loosening elastic element 13 is provided in the fixing hole 12. The anti-loosening elastic element 13 is made of rubber and fits the rubber sleeve on the inner wall of the fixing hole 12. It is fixed in the fixing hole 12 by screws. The insert block 9 passes through the through hole 10 and is fixed to the fixing ring 11.

[0040] The implementation principle of this application embodiment is as follows:

[0041] In actual use, the ring saw body 1 is inserted into the socket 82 of the handle 8 beforehand, so that the end of the ring saw body 1 with the saw teeth 2 passes through the sleeve 83 and abuts against the pre-cutting area. The handle 8 is stably supported by the handle 81, and the ring saw body 1 is rotated. The high teeth 21 and the low teeth 22 cut in staggered manner. The progressive cutting method can reduce tearing and damage to the surrounding tissues, and at the same time reduce the resistance during cutting, making the cutting process smoother and improving cutting efficiency.

[0042] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A medical bone ring saw comprising a ring saw body (1), characterized in that: The ring saw body (1) is a hollow tubular structure. One end of the ring saw body (1) is provided with saw teeth (2) in a ring along the side wall of the ring saw body (1). The saw teeth (2) include high teeth (21) and low teeth (22). The high teeth (21) and low teeth (22) are staggered. The tip of the high teeth (21) is 0.1mm-0.30mm higher than the tip of the low teeth (22).

2. A medical ring saw according to claim 1, characterized in that: The saw teeth (2) are provided with a cutting edge (3) and a back surface (4). The back surface (4) is arranged parallel to the central axis of the ring saw body (1). The intersection of the cutting edge (3) and the back surface (4) is the tooth tip. The included angle formed by the cutting edge (3) and the back surface (4) is the cutting angle (5). The cutting angle (5) is 5°-20°.

3. A medical ring saw according to claim 1, wherein: A transition surface (6) is provided between the roots of the adjacent saw teeth (2).

4. A medical ring saw according to claim 3, wherein: The transition surface (6) is a plane, and the transition surface (6) is inclined at an angle (7) to the straight axis of the ring saw body (1), and the angle (7) is 30°-60°.

5. A medical ring saw according to claim 4, wherein: The transition surface (6) is perpendicular to the cutting edge surface (3).

6. A medical ring saw according to claim 1, wherein: The surface of the saw teeth (2) is coated with titanium nitride.

7. A medical ring saw according to claim 1, wherein: A handle (8) is connected to one end of the ring saw body (1) away from the saw teeth (2). The handle (8) is provided with a socket (82) for inserting the ring saw body (1) and a pair of handles (81).

8. A medical ring saw according to claim 7, wherein: A sleeve (83) concentric with the socket (82) is provided on one side of the handle (8), and the inner diameter of the sleeve (83) is the same as the diameter of the socket (82).

9. A medical ring saw according to claim 8, wherein: The sleeve (83) is provided with a plurality of insert blocks (9) at one end, and the insertion hole (82) is provided with a plurality of insertion holes (10) corresponding to the insert blocks (9) on the outer circumference. The handle (8) is provided with a fixing ring (11) on the side away from the sleeve (83), and the fixing ring (11) is provided with a fixing hole (12) corresponding to the insert block (9).

10. A medical ring saw according to claim 9, wherein: An anti-loosening elastic element (13) is provided inside the fixing hole (12).

Images