CN218943428U

CN218943428U - Pedicle channel shaper

Info

Publication number: CN218943428U
Application number: CN202222045307.6U
Authority: CN
Inventors: 刘鹏; 牟建辉; 王兆麟; 孙东; 闫东; 曹剑; 郭连志
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2022-08-04
Filing date: 2022-08-04
Publication date: 2023-05-02
Anticipated expiration: 2032-08-04

Abstract

The utility model relates to a pedicle tunnel former, comprising: bullet type cutter head; the bullet type cutter head is arranged at the first end of the rod body; the buffer zone is arranged between the rod body main body and the bullet type cutter head; the handle is arranged at a second end of the rod body opposite to the first end. Through the improvement to current open circuit ware, this novel pedicle of vertebral arch passageway former accords with hydrodynamic properties, with pedicle of vertebral arch passageway form assorted, prevents the formation of false nature passageway, and can guide the point portion of pedicle of vertebral arch passageway former to reach the centrum through the isthmus gradually, can shorten operation time simultaneously, reduce the operation risk. The device has simple structure, convenient use and easy popularization.

Description

Pedicle channel shaper

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a bullet type pedicle channel former.

Background

Spinal fusion and pedicle screw fixation have become very common surgical techniques for spinal surgeons and have proven to provide benefits to patients. At present, pedicle screws are one of the most widely used internal fixation instruments in spinal surgery, and the success and safe implantation of pedicle screws are the key to the success of the surgery; in order to ensure safe implantation of the screw, a channel into which the screw enters is usually required to be established in advance by an operator before the screw is implanted, and the channel is mostly established according to the hand feeling and experience of an operator and heuristically drilled in the approximately shape-moving direction of the pedicle, so that the probability of misplacement of the screw is high, and the channel is easier to penetrate out of the pedicle. Pedicle screw misalignment can lead to clinically significant consequences such as vascular injury, nerve injury, reduced screw holding force, and ultimately failure of implantation. When pedicle screws are placed using conventional freehand methods, the accuracy varies widely, from 43% to 86%, depending on the surgeon or reporting study. One review by Yahir showed that of a total of 5756 patients treated with pedicle screws, only 146 (2.5%) screws were misplaced, 65 (1.1%) had dural tears, and 99 (1.7%) had nerve damage.

Accurate placement of pedicle screws requires two factors: a stapling point and a stapling direction. The body position of the patient is prone, the nailing point can be determined through anatomical marks, the implementation is relatively easy, and the nailing direction is relatively difficult to determine. The nailing direction is a vector in a three-dimensional space, the vector is projected on a plane, a certain transverse angle and a certain longitudinal angle are formed between the nailing direction and a vertical line of a nailing point, and after the two angles of the transverse angle and the longitudinal angle are determined, the nailing direction can be determined. The ideal transverse angle and the longitudinal angle can be obtained through preoperative axial CT measurement and intraoperative lateral X-ray perspective measurement, and how to control the pointing direction of the open circuit device to coincide with the nailing direction is the key of success or failure of the pedicle screw implantation.

The pedicle tunnel is flared, large in mouth, leading to the pedicle isthmus, and the most ideal pedicle tunnel forming device should be adaptable to the flare form at the entrance and be capable of guiding the tip of the pedicle tunnel former gradually through the isthmus to the vertebral body. Therefore, how to ensure the accuracy of the open circuit of the screw channel is the key for ensuring the success of the spine surgery, and a screw channel pre-open device which is simple to operate, safe and accurate is designed by applying the modern concept, so that the screw channel pre-open device has very important and practical values for facilitating the operation, ensuring the operation safety, developing related operations in primary hospitals and promoting the development level of spine surgery in China.

Disclosure of Invention

Aiming at the problems, the utility model aims to provide the pedicle opening device for the spinal surgery, which has the advantages of simple structure, convenient use and accurate screw placement, can limit the over-deep placement of the opening cone, and the bullet-head pedicle channel shaper accords with the hydrodynamic property, is matched with the shape of the pedicle channel, and reduces the risk of damage to blood vessels and nerves.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a pedicle tunnel former, the pedicle tunnel former comprising:

bullet type cutter head;

the bullet type cutter head is arranged at the first end of the rod body;

the buffer zone is arranged between the rod body main body and the bullet type cutter head;

the handle is arranged at a second end of the rod body opposite to the first end.

Optionally, the bullet type cutter head is morphology matched to the pedicle tunnel.

Optionally, the buffer is morphology-adapted to the pedicle tunnel.

Optionally, the handle comprises a cone portion and an anti-slip portion connected to the cone portion; the cone portion is connected to the second end of the rod body.

Optionally, the anti-slip part comprises a groove and anti-slip threads arranged on the surface of the groove.

Optionally, rounded corners are ground at the external edges of the grooves.

Alternatively, the handle may be made of wood or plastic.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model comprises a bullet head, a rod body and a handle part, wherein the furthest end of the bullet head type pedicle channel shaper is a bullet head type tool bit, the bullet head type pedicle channel shaper accords with hydrodynamic characteristics, is matched with the shape of a pedicle channel, can adapt to the shape of a horn mouth at the entrance of the pedicle channel, and can guide the tip of the pedicle channel shaper to gradually pass through the isthmus to reach the vertebral body. The device has simple structure, convenient use and easy popularization.

Drawings

FIG. 1 is a schematic view of the structure of the present utility model

The marks in the figure: 1 bullet type cutter head, 2 open cone buffer zone, 3 rod body, 4 handle and 5 handle groove

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.

Referring to fig. 1, the present utility model provides a pedicle tunnel former, which includes: a bullet type cutter head 1; the bullet type cutter head 1 is arranged at the first end of the rod body 3; the buffer zone 2 is arranged between the rod body main body and the bullet type cutter head 1; a handle 4, the handle 4 being arranged at a second end of the rod body 3 opposite to said first end.

The bullet type cutter head 1 is conical, and when in use, after the tip of the cone is aligned to the nail-in point, the cone design of the bullet type cutter head is matched with the shape of the pedicle channel, so that the open-circuit cone is more convenient to put in, and the damage to nerve vessels can be prevented.

Optionally, the buffer zone 2 conforms to the shape of the pedicle, i.e. is adapted to the shape of the pedicle tunnel, and is designed to guide the insertion of the open-circuited cone, while limiting the insertion of the open-circuited cone too deep.

Optionally, rounded corners are ground at the external edges of the grooves.

Alternatively, the handle may be made of wood or plastic.

The application using the present utility model is for example as follows:

after the general anesthesia is successful, the patient takes the prone position. Conventionally sterilizing, paving a sterile surgical drape, making a median incision after thoracolumbar vertebrae, cutting skin, subcutaneous, deep fascia, stripping paraspinal muscles below periosteum layer by layer, exposing a vertebral lamina to a articular process joint, and outwards freeing transverse processes, confirming a screw feeding point of the pedicle of the thoracolumbar vertebrae, removing cortex of the screw feeding point by using a tip mouth rongeur, opening at the screw feeding point, and gradually rotating and entering along the pedicle of the vertebrae along the direction perpendicular to the vertebral lamina along the screw feeding point by using an open cone. The subsequent operation is carried out according to the thoracolumbar pedicle post-path nail-bar fixing technology.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. A pedicle tunnel former, comprising:

bullet type cutter head;

the bullet type cutter head is arranged at the first end of the rod body;

the handle is arranged at a second end of the rod body opposite to the first end;

the bullet head type tool bit is matched with the pedicle channel in shape;

the buffer zone is matched with the pedicle channel in morphology.

2. The pedicle tunnel former of claim 1 wherein the handle comprises a cone portion and a slip prevention portion connected to the cone portion; the cone portion is connected to the second end of the rod body.

3. The pedicle tunnel former of claim 2 wherein the slip prevention portion comprises a groove and slip prevention threads provided on a surface of the groove.

4. A pedicle tunnel former as claimed in claim 3 wherein the external corners of the grooves are rounded.

5. The pedicle tunnel former of claim 2 wherein the material of the handle comprises wood or plastic material.