CN219109636U

CN219109636U - Z-shaped osteotome suitable for MIS-TLIF operation

Info

Publication number: CN219109636U
Application number: CN202223499681.XU
Authority: CN
Inventors: 柳万国; 朱宇航; 顾锐; 武汉
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-06-02
Anticipated expiration: 2032-12-28

Abstract

The utility model provides a Z-shaped osteotome suitable for MIS-TLIF operation, which comprises a Z-shaped chisel head and a handle, wherein the Z-shaped chisel head comprises a chisel head, a connecting part and a long handle, the chisel head, the connecting part and the long handle are sequentially connected, the connecting part is bent upwards relative to the long handle, and the chisel head is bent downwards relative to the connecting part; the head end of the chisel head is provided with a chamfer cutting edge; the handle is connected with the tail end of the long handle. The Z-shaped structure of the utility model fully matches the anatomical structures of the spinous process and the vertebral lamina in the vertebral canal, and overcomes the defect of difficult operation caused by bony shielding when the traditional straight osteotome is used for contralateral decompression. Meanwhile, the force application direction of the Z-shaped osteotome is consistent with the actual force application direction, so that the reduction of force is avoided, and the same action and effect as those of the straight osteotome can be achieved. In addition, the Z-shaped osteotome designs the head of the chisel into a crescent semicircular blade, can fully scrape the ligamentum flavum and the proliferated bone attached to the contralateral vertebral plate, and can avoid damaging nerves due to the concave arc structure.

Description

Z-shaped osteotome suitable for MIS-TLIF operation

Technical Field

The utility model relates to a medical appliance, in particular to a Z-shaped osteotome suitable for MIS-TLIF operation.

Background

Lumbar spinal stenosis is common in the elderly, and can cause pain in the waist and legs of the patient, and the patients with unobvious improvement of the symptoms of the non-operative treatment over 3 months need to be considered to be treated by the operation. Along with the continuous update and development of the minimally invasive spinal technology, minimally invasive transforaminal lumbar interbody fusion (Minimally invasive transforaminal lumbar interbody fusion, MIS-TLIF) is gradually applied to lumbar spinal stenosis, and the lesion segments are decompressed, fused and fixed through the intervertebral foramen by means of an expanded working channel, so that the minimally invasive transforaminal lumbar interbody fusion has the advantages of small tissue damage, less bleeding in the operation, quick postoperative recovery and the like.

However, since MIS-TLIF is operated under minimally invasive procedures, when contralateral decompression of the responsible segment is performed, the visibility of the surgical field is poor and the operative space is limited when the contralateral proliferative bone and ligaments are resected using a conventional straight osteotome due to the limitations of the morphology of the spinous process and contralateral lamina. Therefore, there is a need to design an osteotome specifically adapted for use in MIS-TLIF contralateral decompression procedures that can match the anatomy of the vertebral body, facilitate the procedure, and overcome the current difficulties of MIS-TLIF contralateral decompression procedures.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a Z-shaped osteotome suitable for MIS-TLIF operation, which comprises a Z-shaped chisel head and a handle, wherein the Z-shaped chisel head comprises a chisel head, a connecting part and a long handle, the chisel head, the connecting part and the long handle are sequentially connected, the connecting part is bent upwards relative to the long handle, and the chisel head is bent downwards relative to the connecting part; the head end of the chisel head is provided with a blade; the handle is connected with the tail end of the long handle.

The bending angle between the chisel head and the connecting part is 120-150 degrees; the bending angle between the connecting part and the long handle is 120-150 degrees.

The bending angle between the chisel head and the connecting part is the same as the bending angle between the connecting part and the long handle.

The bending parts between the chisel head and the connecting part and between the connecting part and the long handle are arc-shaped transition.

The chisel head is a strip-shaped flat chisel head, and the front end of the chisel head is a bevel cutting edge.

In another mode, the chisel head is an arc chisel head, and the front end of the chisel head is a semicircular blade.

The Z-shaped chisel head is of an integrated structure, the Z-shaped chisel head and the handle are of a split type connection structure, and the Z-shaped chisel head and the handle are connected or spliced through threads, so that the Z-shaped chisel head with different specifications can be replaced conveniently.

The handle is of a cylindrical or polygonal prism structure, and anti-slip protrusions are arranged on the surface of the handle.

The working principle of the utility model is as follows:

when the bone chisel is needed to cut off contralateral proliferation bone and yellow ligament, the spinal nerve is pulled away to leave a certain working space for the bone chisel, and then the bone chisel extends into a lesion segment through the intervertebral foramen through the muscle gap, and the bone chisel head is used for cutting the yellow ligament and proliferation bone. The arc chisel head can prevent bone chisel from accidentally injuring bone marrow nerves during the cutting operation of the bone chisel.

The utility model has the beneficial effects that:

the Z-shaped structure of the Z-shaped osteotome suitable for MIS-TLIF operation provided by the utility model is fully matched with the anatomical structures of the spinous process and the vertebral lamina in the vertebral canal, and the defect that the traditional straight osteotome is difficult to operate due to osseous shielding when performing contralateral decompression is overcome. Meanwhile, the force application direction of the Z-shaped osteotome is consistent with the actual force application direction, so that the reduction of force is avoided, and the same action and effect as those of the straight osteotome can be achieved. In addition, the Z-shaped osteotome of the utility model designs the head of the chisel into a crescent semicircular blade, and can fully scrape off the ligamentum flavum and the proliferated bone attached to the contralateral vertebral plate when the responsible segment cuts off the proliferated bone and the ligamentum flavum when the contralateral decompression is carried out, and the sunken arc-shaped structure can avoid damaging nerves.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of a flat chisel embodiment of the utility model;

FIG. 3 is a schematic view of an embodiment of an arcuate chisel head of the utility model;

FIG. 4 is a schematic view of a threaded connection according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a plugging embodiment of the present utility model;

FIG. 6 is a schematic diagram of the present utility model;

1. z-shaped chisel head 2, handle 3, chisel head 4, connecting part 5, long handle 6, chamfer cutting edge 7, semicircle cutting edge 8, threaded rod 9, threaded hole 10, inserted bar 11, jack 12, nerve retractor 13, lumbar vertebra 14, spinal cord nerve.

Detailed Description

Referring to fig. 1, the present utility model provides a Z-shaped osteotome suitable for MIS-TLIF operation, comprising a Z-shaped chisel head 1 and a handle 2, wherein the Z-shaped chisel head 1 comprises a chisel head 3, a connecting portion 4 and a long handle 5, the chisel head 3, the connecting portion 4 and the long handle 5 are sequentially connected, wherein the connecting portion 4 is bent upwards relative to the long handle 5, and the chisel head 3 is bent downwards relative to the connecting portion 4 to form a "Z" -shaped bending structure; the head end of the chisel head 3 is provided with a cutting edge; the handle 2 is connected with the tail end of the long handle 5.

The bending angle between the chisel head 3 and the connecting part 4 is 120-150 degrees; the bending angle between the connecting part 4 and the long handle 5 is 120-150 degrees.

The bending angle between the chisel head 3 and the connecting part 4 is the same as the bending angle between the connecting part 4 and the long handle 5, so that the chisel head 3 is parallel to the long handle 5, and the force applied to the long handle 5 can be effectively conducted to the chisel head 3.

The bending parts between the chisel head 3 and the connecting part 4 and between the connecting part 4 and the long handle 5 are arc-shaped transition, so that damage to marrow nerves is prevented.

As shown in fig. 2, the chisel head 3 is a strip-shaped flat chisel head, and the head end of the chisel head 3 is provided with a chamfer cutting edge 6.

In another embodiment, as shown in fig. 3, the chisel head 3 is an arc chisel head, and the front end of the chisel head 3 is a crescent semicircular blade 7.

As shown in fig. 4, the Z-shaped chisel 1 formed by the chisel 3, the connecting portion 4 and the long handle 5 is of an integral structure, the Z-shaped chisel 1 and the handle 2 are of a split connecting structure, the tail end of the long handle 5 of the Z-shaped chisel 1 is provided with a threaded rod 8, and the front end of the handle 2 is provided with a threaded hole 9,Z, and the chisel 1 and the handle 2 are connected through threads.

In another embodiment, as shown in fig. 5, the end of the long handle 5 of the Z-shaped chisel 1 is provided with a plug 10, the front end of the handle 2 is provided with a jack 11, and the Z-shaped chisel 1 is inserted into the handle 2.

The handle 2 is of a cylindrical or polygonal prism structure, and the surface of the handle is provided with anti-slip protrusions.

The working principle of the utility model is as follows:

as shown in fig. 6, the utility model is applied to minimally invasive transforaminal lumbar interbody fusion, when the opposite side hyperplasia bone and the yellow ligament are required to be resected by using the osteotome, the nerve retractor 12 is firstly used for extending into the lumbar vertebra 13 vertebral canal through the intervertebral foramen through the muscle gap, the spinal nerve 14 is pulled away, a certain working space is reserved for the osteotome, the handle 2 of the utility model is held, the Z-shaped chisel head 1 is extended into a lesion segment through the intervertebral foramen through the muscle gap, and the chisel head 3 is used for cutting the yellow ligament and the hyperplasia bone. The arc chisel head can prevent bone marrow nerve from being accidentally injured during the osteotome cutting operation.

Claims

1. A Z-bone chisel suitable for MIS-TLIF surgery, characterized by: the Z-shaped chisel comprises a chisel, a connecting part and a long handle, wherein the chisel, the connecting part and the long handle are sequentially connected, the connecting part bends upwards relative to the long handle, and the chisel bends downwards relative to the connecting part; the head end of the chisel head is provided with a blade; the handle is connected with the tail end of the long handle.

2. A Z-bone chisel suitable for MIS-TLIF surgery as defined in claim 1, wherein: the bending angle between the chisel head and the connecting part is 120-150 degrees; the bending angle between the connecting part and the long handle is 120-150 degrees.

3. A Z-bone chisel suitable for MIS-TLIF surgery as defined in claim 1 or 2, wherein: the bending angle between the chisel head and the connecting part is the same as the bending angle between the connecting part and the long handle.

4. A Z-bone chisel suitable for MIS-TLIF surgery as defined in claim 1, wherein: the bending parts between the chisel head and the connecting part and between the connecting part and the long handle are arc-shaped transition.

5. A Z-bone chisel suitable for MIS-TLIF surgery as defined in claim 1, wherein: the chisel head is a strip-shaped flat chisel head, and the front end of the chisel head is provided with a bevel cutting edge.

6. A Z-bone chisel suitable for MIS-TLIF surgery as defined in claim 1, wherein: the chisel head is an arc chisel head, and the front end of the chisel head is a semicircular blade.

7. A Z-bone chisel suitable for MIS-TLIF surgery as defined in claim 1, wherein: the Z-shaped chisel head is of an integrated structure, the Z-shaped chisel head is of a split type connecting structure with the handle, and the Z-shaped chisel head is connected with the handle through threads or is inserted into the handle.

8. A Z-bone chisel suitable for MIS-TLIF surgery as defined in claim 1, wherein: the handle is of a cylindrical or polygonal prism structure, and anti-slip protrusions are arranged on the surface of the handle.