JP3081575U - Pedicle position confirmation instrument - Google Patents

Abstract

(57) [Summary] [Problem] To accurately measure the position of a pedicle and the depth of a hole, and to confirm the right and left under X-ray fluoroscopy. Prevent bleeding from holes. Kind Code: A1 A pedicle locator having a movable ring of a conical or left and right discriminating shape in which a bar surface having a plate having a sharp tip and a circular rear end is graduated.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pedicle position confirmation device for clearly identifying a pedicle, which is a fixing position of each vertebra, when a spine is repaired and fixed from behind.

[0002]

[Prior art]

 When repairing and fixing the spine from the back, wires or the like are inserted into the holes of the pedicle 5 to 6 left and right around each vertebra to check the position. After confirming the position and depth, screws and hooks for connecting and fixing each vertebra are attached. The fixation of the spine requires high precision in the positional relationship to be fixed, and confirmation work is performed through X-rays from various angles. There is no dedicated instrument for pedicle position confirmation.

[0003]

[Problems to be solved by the invention]

 With conventional wires, the depth of the holes for attaching screws and hooks to the vertebrae cannot be directly confirmed.

A conventional wire or the like has no hemostatic effect against bleeding from a hole.

[0005] With conventional wire or the like, the left and right sides of the pedicle cannot be distinguished.

[0006]

[Means for Solving the Problems]

 In order to achieve the above task, the technical measures taken by the present invention are to first mark the depth of the bar on the surface of the bar, and to move the bar made of X-ray opaque material that stops at any position in the middle of the bar. I attached a formula ring.

The tip of the movable ring has a conical shape, and when the pedicle position confirming instrument is inserted into the vertebra, the conical tip closes the hole and has a shape capable of stopping hemostasis.

[0008] The movable ring is of two types, such as a sphere and a rectangular parallelepiped, which can be identified from all angles. Each of the two types is defined as a left type and a right type. Made it possible.

[0009] The movable ring is composed of characters such as "R, L" and "right and left" that can be distinguished at a glance from the left and right, and the characters whose outer periphery is cut out in a flat plate state are printed on at least three sides. It was attached and arranged, and left and right discrimination was enabled in the confirmation image when X-rays were irradiated.

[0010]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a pedicle position confirming device according to claim 1, wherein a rod having a scale 2 indicating depth and a movable type made of an X-ray opaque material that stops at an arbitrary position in the middle of the rod. It consists of a ring 1. The movable ring 1 can be recognized as a sphere from any angle as described in claim 2. The front end 3 is sharp and the rear end is provided with a circular plate 4 for easy pushing.

[0011] In order to make X-ray opaque, it is desirable to use stainless steel or titanium, which is widely used as a medical device, as a material. However, when both the rod body and the movable ring are made of metal, the frictional resistance is too small. It is difficult to stop at any position along the rod. As a solution to this, if the material of the sliding surface of the movable ring with the rod is made of a heat-resistant plastic 5, the frictional resistance becomes appropriate and can be stopped at any position. In FIG. 1, the movable ring 1 uses a heat-resistant plastic 5 so that the sliding surface with the rod body can withstand high-pressure steam sterilization.

FIG. 3 shows a movable ring 1 according to the third aspect, in which a letter “R” is used, and a letter whose outer periphery is cut out in a flat plate state is attached to three sides. Again, heat-resistant plastic 5 is used for the sliding surface with each rod body.

[0013]

[Effect of the invention]

 The pedicle position confirmation device of the present invention can grasp the depth of the holes for attaching screws and hooks, and can easily confirm the position by X-rays.

The conical movable ring has a hemostatic effect, and the movable ring having a specific shape allows the left and right pedicle positions to be identified.

[0015]

[Brief description of the drawings]

FIG. 1 is an external view of a case where a movable ring has a conical shape.

FIG. 2 is an external view in the case where a movable ring is a sphere.

FIG. 3 is an external view in a case where a movable ring is “R”.

[Explanation of symbols]

 Reference Signs List 1 movable ring 2 scale 3 tip 4 circular plate 5 heat-resistant plastic

Claims (4)

[Utility model registration claims] 1. A rod-shaped instrument for confirming the position of a pedicle used when performing spinal fusion surgery, the tip of which is sharpened to be inserted into a hole of a vertebra, and a scale indicating the inserted depth. A pedicle locator that has a movable ring made of an X-ray opaque material that is connected to a circular plate so that it can be easily pushed in at the rear end and stops at any position along the rod. 2. The method according to claim 2, wherein the tip of the movable ring has a conical shape, and when the pedicle locating instrument is inserted into the vertebra, the conical tip closes a hole in the vertebra and has a hemostatic effect. The pedicle position confirming device according to claim 1. 3. The movable ring is of two types, such as a sphere and a rectangular parallelepiped, which can be identified from all angles, and each of them is defined as a left type and a right type. The left and right types are identified in a confirmation image when irradiated with X-rays. 2. The pedicle position confirming device according to claim 1, wherein the device can be used. 4. The movable ring is, for example, "R, L", "right,
Using a combination of characters that can be identified at a glance such as left, at a glance, the characters whose outer edges have been cut out in a flat state are stuck together on at least three sides, and the left and right identification in the confirmation image when irradiating with X-rays Claims that enabled
The pedicle position confirmation device according to 1.