JP3081580U - Pedicle drilling instrument - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To safely make a highly accurate hole in a pedicle during spinal fusion surgery. A cross section of a shaft of a pedicle drilling tool is processed into a highly accurate square. Scale the shaft and provide a movable ring so that the depth can be checked.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a device for drilling a hole in a pedicle, which is a fixing position of each vertebra, when repairing and fixing a spine from behind.

[0002]

[Prior art]

 When fixing the spine from behind, holes are drilled at the pedicles of the vertebrae, and screws and hooks for connecting and fixing each vertebra are attached. The diameter and depth of this hole are very important and require precision. Conventionally, holes were drilled using an air drill or drill.

[0003]

[Problems to be solved by the invention]

 If an air drill is used, the power will be too strong and may damage nerves, blood vessels, etc., and it is also difficult to adjust the depth. When a cone is used, the diameter of the hole is not accurate. If the size of the hole is unstable, problems such as wobble occur when connecting and fixing the vertebrae.

[0004]

[Means for Solving the Problems]

 A scale indicating the depth of the hole drilled in the shaft of the pedicle drilling instrument is marked on the surface, and the cross section of the shaft is square. It was set to be the hole diameter. It also has a movable ring that stops at any position in the shaft to accurately measure the depth of the hole.

[0005]

[Embodiment of the invention]

 FIG. 1 shows an example of a pedicle drilling instrument. The tip 2 of the shaft 1 having a scale 5 indicating the depth of the drilled hole on the surface thereof is sharply pointed, and the rear end is provided with a cylindrical grip 3 so as to be vertically connected to the shaft. The cross-section of the shaft 1 is a square, and when rotated and used like a cone, the length of the diagonal of the square is set to be the diameter of the hole to be opened. If the dimensional accuracy of the square is high, the diameter of the hole is naturally high in accuracy, and problems such as wobble do not occur. The shaft 1 is preferably made of a hard material such as stainless steel SUS304, SUS420J2 and SUS330. The grip 3 may be made of a metal such as aluminum or brass because the load is not applied. The figure shows a non-slip knurled cut. The movable ring 4 that stops at an arbitrary position in the middle of the shaft 1 is made of heat-resistant resin and withstands high-pressure steam sterilization.

[0006]

[Effect of the invention]

 As described above, the present invention can make a hole with high precision in depth and diameter in the pedicle, and there is no danger of damaging other tissues such as nerves and blood vessels.

[Brief description of the drawings]

FIG. 1 is an external view of a pedicle drilling device.

[Explanation of symbols]

 1 Shaft 2 Tip 3 Grip 4 Movable ring 5 Scale

Claims (1)

[Utility model registration claims] 1. An instrument for drilling a hole in a pedicle used for performing spinal fusion surgery, wherein a scale indicating the depth of the drilled hole is marked on the surface, and the tip of a shaft is sharply pointed. The rear end has a cylindrical grip to connect vertically with the shaft, the cross section of the shaft is square, and when used like a cone, it will open the diagonal of the square. A pedicle drilling device with a movable ring set to the diameter of the hole and stopping at any point along the shaft.