Percutaneous centrum girdling bone taking assembly for minimally invasive spine surgery

Abstract

The utility model discloses a percutaneous centrum girdling bone taking assembly for a minimally invasive spine surgery. The percutaneous centrum girdling bone taking assembly comprises a positioning sleeve, an external trephine and an endoscope which are sequentially arranged from outside to inside in a sleeved mode. When the positioning sleeve is operated in an operation, the driving tube is rotated downwards, the driving tube is used for pressing the positioning needles downwards to be inserted into a bone layer, operation is convenient, the positioning needles are sharp and can be smoothly inserted into the bone layer, the driving tube and the positioning tube are locked through threads, and the stability of the insertion state of the positioning needles is guaranteed. After the operation is completed, the rotary driving tube moves upwards, and the positioning needle is driven to move upwards and retreat from the bone layer under the action of the reset spring, so that the instrument is convenient to take out. The lower end of the positioning sleeve is inserted into a bone layer, a stable channel is provided for the extrascopic trephine, the phenomenon of saw sliding of the extrascopic trephine is prevented, and the success rate of articular process forming is greatly increased.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic medical instruments, in particular to a percutaneous vertebral ring excision bone harvesting component for minimally invasive spine surgery. Background Art

[0002] Lumbar disc herniation is one of the more common spinal degenerative diseases in clinical practice. The first onset of lumbar disc herniation can usually be cured through conservative treatment, but patients with recurrent episodes, combined with lumbar spinal stenosis, and symptoms of nerve damage often require surgical treatment.

[0003] With the development of percutaneous transforaminal endoscopic lumbar disc surgery technology, it has gradually become the preferred treatment for lumbar disc herniation. The surgery has the following advantages: it is performed under local anesthesia, with little trauma and retaining the normal movement function of the lumbar disc; no muscle stripping, no excessive bone removal, and little impact on the stability of the spine; fast recovery and short hospitalization time. One of the key steps of the surgery is to use a ring saw to remove the hyperplastic bone distal to the facet joint and part of the protruding part of the upper joint. The purpose is to expand the intervertebral foramen to provide space for transforaminal endoscopic lumbar disc surgery, so as to be able to completely remove the protruding disc, hyperplastic ligaments and other pathological tissues that compress the nerves.

[0004] At present, extra-endoscopic ring saws are mostly used in clinical work to complete visualized superior facet shaping. However, from the perspective of surgical safety, the serrations at the head end of the ring saw are designed to be thicker, up to 0.5 mm, and the cutting sharpness is poor. The initial stage of facet shaping is the most critical. Due to the poor sharpness of the ring saw, the "drift" phenomenon is prone to occur during the initial rotation of the ring saw, that is, the ring saw does not rotate into the bone in the predetermined direction to complete the cutting, but moves toward the head or tail end. The intervertebral foramen area is narrow, and important nerves and vascular structures pass through the area. Once the position of the ring saw changes, it is likely to cause serious nerve and vascular damage, affecting the safety of the operation.

[0005] Chinese utility model patent ZL202010372433.5 discloses a precision depth-limited threaded ring saw set for percutaneous vertebral ring cutting and bone drilling for minimally invasive spinal surgery, which discloses that anti-slip teeth are provided on the bottom side of the limiting soft tissue expansion sleeve, and the anti-slip teeth are used to fix the limiting soft tissue expansion sleeve on the spinal vertebral body and prevent the limiting soft tissue expansion sleeve from sliding, thereby positioning the depth-limiting ring saw. However, there are many young and middle-aged patients with lumbar disc herniation, and the bone cortex is strong. It is difficult to enter the bone simply through a circle of anti-slip teeth. A large external force is required to knock the limiting soft tissue expansion sleeve, and there is still a risk of forming failure. Therefore, how to improve the success rate of fully visualized articular process forming, especially to solve the "deviated position" phenomenon that may occur in the initial forming, is a problem that current spinal orthopedic clinicians urgently need to solve. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a percutaneous vertebral ring cutting bone harvesting component for minimally invasive spine surgery which can effectively prevent saw slippage.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A percutaneous vertebral ring resection bone removal component for minimally invasive spinal surgery, comprising a positioning sleeve, an external ring saw and an endoscope, which are sequentially sleeved from the outside to the inside, characterized in that the positioning sleeve comprises a positioning tube, a driving tube and a plurality of positioning needles;

[0009] The inner cavity of the positioning tube is a stepped hole, the lower section of which is the positioning cavity, and the inner diameter of the upper section is increased to form an adjustment cavity; a plurality of axially penetrating guide holes are opened in the side wall of the positioning cavity, and the plurality of guide holes are evenly distributed in the circumference, and the inner diameter of the lower end of the guide hole is reduced to form a limited position step; the inner wall of the adjustment cavity has threads;

[0010] The positioning pin is located in each guide hole, the diameter of the lower end of the positioning pin is reduced, and a return spring is sleeved on the lower end of the positioning pin, the lower end of the return spring abuts against the limit step of the guide hole, and the upper end of the positioning pin can extend upward out of the guide hole;

[0011] The driving tube has an external thread and is threadedly connected to the adjusting cavity. Rotating the driving tube downward can drive the positioning needle to extend downward out of the guide hole.

[0012] A further technical solution is characterized in that the inner diameter of the driving tube is not less than the inner diameter of the positioning cavity.

[0013] A further technical solution is characterized in that the inner wall of the positioning cavity has a thread, and the outer wall of the mirror outer ring saw and the inner wall of the positioning cavity are connected by threads.

[0014] A further technical solution is that when the return spring is not under force, the height of the positioning pin extending up and down from the guide hole is 3-5 mm, and the distance that the driving tube drives the positioning pin to move downward is 3-5 mm.

[0015] A further technical solution is that the number of the positioning needles is 3-8.

[0016] A further technical solution is to further include a slotted tube, the outer diameter of the slotted tube is opposite to the outer diameter of the mirror outer ring saw, the inner diameter of the slotted tube is opposite to the inner diameter of the mirror outer ring saw, and the front end of the slotted tube has a half circle of sharp blade extending downward, and the extension length of the sharp blade is 3-5mm.

[0017] A further technical solution is that the sharp blade has an arc-shaped head.

[0018] The beneficial effects of adopting the above technical solution are:

[0019] In this component, the lower end of the positioning sleeve is inserted into the bone layer to provide a stable channel for the endoscopic ring saw, prevent the endoscopic ring saw from slipping, and greatly improve the success rate of articular process shaping.

[0020] During operation, the driving tube is rotated downward, and the multiple positioning needles are pushed downward by the driving tube to be inserted into the bone layer. The operation is convenient, the positioning needles are sharp, and can be smoothly inserted into the bone layer. In addition, the driving tube and the positioning tube are locked by threads to ensure the stability of the insertion state of the positioning needles. After the operation is completed, the driving tube is rotated upward, and under the action of the reset spring, the positioning needles are driven to move upward and withdraw from the bone layer, making it easier to remove the instrument.

[0021] Moreover, the lower end of the positioning needle is retracted into the guide hole and is not exposed, so as not to accidentally injure medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the positioning tube in the utility model;

[0025] Figure 3 It is a schematic diagram of the top view of the positioning tube in the utility model;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the positioning sleeve in the utility model (the positioning needle is located in the guide hole);

[0027] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure of part A;

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure of the positioning sleeve in the utility model (the positioning pin protrudes downward from the guide hole)

[0029] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure of part B;

[0030] Figure 8 It is a structural schematic diagram of the slotted pipe in the utility model. DETAILED DESCRIPTION

[0031] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] like Figure 1 to Figure 7 As shown, a percutaneous vertebral ring excision bone removal component for minimally invasive spine surgery includes a positioning sleeve 1, an endoscope ring saw 2 and an endoscope, which are sequentially arranged from the outside to the inside. The lower end of the positioning sleeve 1 is inserted into the bone layer to provide a stable channel for the endoscope ring saw 2 to prevent the endoscope ring saw 2 from slipping, thereby greatly improving the success rate of joint process formation.

[0034] In this assembly, the outer ring saw 2 and the endoscope are both prior art and will not be described in detail here. The positioning sleeve 1 in the assembly includes a positioning tube 110, a driving tube 120 and a plurality of positioning pins 130. The inner cavity of the positioning tube 110 is a stepped hole, the lower section of which is a positioning cavity 111, and the inner diameter of the upper section is increased to form an adjustment cavity 112; a plurality of axially penetrating guide holes 113 are provided in the side wall of the positioning cavity 111, and the plurality of guide holes 113 are evenly distributed in the circumferential direction, and the inner diameter of the lower end of the guide hole 113 is reduced to form a limited step; the inner wall of the adjustment cavity 112 has threads. The positioning pin 130 is located in each guide hole 113. The number of the positioning pins 130 corresponds to the number of the guide holes 113, preferably 3-8. The diameter of the lower end of the positioning pin 130 is reduced, and a return spring 131 is sleeved on the lower end. The lower end of the return spring 131 abuts against the limit step of the guide hole 113, and the upper end of the positioning pin 130 can extend upward out of the guide hole 113. The driving tube 120 has an external thread and is threadedly connected to the adjusting cavity 112. Rotating the driving tube 120 downward can drive the positioning pin 130 to extend downward out of the guide hole 113.

[0035] When the return spring 131 is not under force, the height of the positioning needle 130 extending up and down from the guide hole 113 is 3-5mm, and the driving tube 120 drives the positioning needle 130 to move downward by 3-5mm. When the driving tube 120 moves to the lowest position allowed, it is limited by the step of the inner cavity of the positioning tube 110 to prevent the positioning needle 130 from being inserted to a greater depth.

[0036] During the operation of the positioning sleeve, the driving tube 120 is rotated downward, and the driving tube 120 is used to press down multiple positioning pins 130 to move downward and insert into the bone layer. The operation is convenient, and the positioning pins 130 are sharp and can be smoothly inserted into the bone layer, avoiding knocking by other technical instruments. In addition, the driving tube 120 and the positioning tube 110 are locked by threads to ensure the stability of the insertion state of the positioning pins 130. After the operation is completed, the driving tube 120 is rotated upward, and under the action of the reset spring 131, the positioning pins 130 are driven to move upward and withdraw from the bone layer, which is convenient for the removal of the instrument.

[0037] Moreover, the lower end of the positioning needle 130 is retracted into the guide hole 113 and is not exposed to the outside, so as not to accidentally injure medical personnel.

[0038] The inner diameter of the driving tube 120 is not less than the inner diameter of the positioning cavity 111 , and will not affect the installation of the mirror outer ring saw 2 .

[0039] The inner wall of the positioning cavity 111 is provided with threads, the outer wall of the rim saw 2 is connected with the inner wall of the positioning cavity 111 by threads, and the rim saw 2 is fitted with a clearance by the adjusting cavity 11. The thread structure can accurately control and adjust the rotation speed and screwing depth of the rim saw 2, and prevent the rim saw 2 from hanging and falling into the air when it is installed in the positioning sleeve 1 to perform pressure-driven peeling, or even protruding into the spinal canal to cause nerve damage.

[0040] like Figure 8 As shown, the percutaneous vertebral ring resection bone removal component for minimally invasive spinal surgery also includes a slotted tube 3, the outer diameter of the slotted tube 3 is opposite to the outer diameter of the endoscopic ring saw 2, and the inner diameter of the slotted tube 3 is opposite to the inner diameter of the endoscopic ring saw 2. During the operation, after the channel is established, the positioning sleeve 1 is first inserted into the channel for positioning, and then the slotted tube 3 is inserted into the positioning sleeve 1. Since the front end of the slotted tube 3 has a half-circle sharp blade 301 extending downward, the extension length of the sharp blade 301 is 3-5mm, the outer end of the slotted tube 3 is hammered to make the sharp blade 301 enter the bone layer and open a half-circle positioning groove 3-5mm deep on the bone surface, and then the slotted tube 3 is taken out, and the endoscopic ring saw 2 is inserted into the positioning sleeve 1. At this time, the front end of the endoscopic ring saw 2 can be inserted into the positioning groove, and the endoscopic ring saw 2 can rotate along the positioning groove to further prevent the endoscopic ring saw 2 from slipping.

[0041] The sharp blade 301 on the slotted tube 3 is provided with a half circle, and the sharp blade 301 can be depth-limited by the bottom edge of the other half circle of the slotted tube 3. And the front end of the sharp blade 301 is an arc-shaped head, which is easier to insert into the bone layer for slotting.

[0042] The above are only preferred embodiments of the present invention. Any simple modification, deformation and equivalent replacement made by anyone to the present invention according to the content of the present invention shall fall within the protection scope of the present invention.

Claims

1. A percutaneous vertebral ring resection bone removal component for minimally invasive spinal surgery, comprising a positioning sleeve (1), an external ring saw (2) and an endoscope which are sequentially arranged from the outside to the inside, characterized in that: The positioning sleeve (1) comprises a positioning tube (110), a driving tube (120) and a plurality of positioning needles (130); The inner cavity of the positioning tube (110) is a stepped hole, the lower section of which is a positioning cavity (111), and the inner diameter of the upper section is increased to form an adjustment cavity (112); a plurality of axially penetrating guide holes (113) are provided in the side wall of the positioning cavity (111), the plurality of guide holes (113) are evenly distributed in the circumferential direction, and the inner diameter of the lower end of the guide hole (113) is reduced to form a limited step; the inner wall of the adjustment cavity (112) has a thread; The positioning pin (130) is located in each guide hole (113), the diameter of the lower end of the positioning pin (130) is reduced, and a return spring (131) is sleeved on the lower end, the lower end of the return spring (131) abuts against the limit step of the guide hole (113), and the upper end of the positioning pin (130) can extend upward out of the guide hole (113); The driving tube (120) has an external thread and is threadedly connected to the adjusting cavity (112). Rotating the driving tube (120) downward can drive the positioning needle (130) to extend downward out of the guide hole (113).

2. The percutaneous vertebral body ring resection bone removal component for minimally invasive spinal surgery according to claim 1, characterized in that: The inner diameter of the driving tube (120) is not less than the inner diameter of the positioning cavity (111).

3. The percutaneous vertebral body circumcision bone removal component for minimally invasive spinal surgery according to claim 1, characterized in that: The inner wall of the positioning cavity (111) has threads, and the outer wall of the mirror outer ring saw (2) and the inner wall of the positioning cavity (111) are connected by threads.

4. The percutaneous vertebral body circumcision bone removal component for minimally invasive spinal surgery according to claim 1, characterized in that: When the return spring (131) is in an unstressed state, the height of the positioning pin (130) extending up and down from the guide hole (113) is 3-5 mm, and the driving tube (120) drives the positioning pin (130) to move downward by a distance of 3-5 mm.

5. The percutaneous vertebral body circumcision bone removal component for minimally invasive spinal surgery according to claim 1, characterized in that: The number of the positioning needles (130) is 3-8.

6. The percutaneous vertebral body circumcision bone removal component for minimally invasive spinal surgery according to claim 1, characterized in that: It also comprises a slotted tube (3), the outer diameter of the slotted tube (3) is opposite to the outer diameter of the mirror outer ring saw (2), the inner diameter of the slotted tube (3) is opposite to the inner diameter of the mirror outer ring saw (2), and the front end of the slotted tube (3) has a half circle of sharp blade (301) extending downward, and the extension length of the sharp blade (301) is 3-5 mm.

7. The percutaneous vertebral body circumcision bone removal component for minimally invasive spinal surgery according to claim 6, characterized in that: The sharp blade (301) is an arc-shaped head.

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