JPH09290026A - Burr hole cap for cerebral surgery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely adjust the direction and insertion angle of a catheter by forming a burr hole cap out of a ceramic excellent in biological affinity in a nearly mushroom shape, and forming a notch section in the radial direction communicating the inside and outside of a living body. SOLUTION: This burr hole cap C for covering a burr hole generated in cerebral surgery is formed in a nearly mushroom shape, an umbrella section A and a shaft section B are integrally formed, and a notch section K in the radial direction penetrating both the umbrella section A and the shaft section B is formed. The spherical portion of the umbrella section A is rounded, and its top face is formed into a curved surface having about 10-150R similar to the roundness of the cranial bone of a human. A lug P is formed on the notch section K from a side face K1 toward the opposite side face K1 to close a part of it at the length of about 1/3-2/3 of the cross sectional width (w) of the notch section K. The direction and insertion angle of a catheter can be freely adjusted by utilizing the notch section K of this burr hole cap C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brain surgery barhole cap (hereinafter referred to as a barhole) for closing a barhole (through hole) generated in a craniotomy, which is carried out during treatment in the field of brain surgery. Cap).

[0002]

2. Description of the Related Art Conventionally, so-called open craniotomy, which is a partial incision of the skull, is performed for the treatment of brain tumor, cerebral thrombosis, trauma, bone fracture and the like in the area of brain surgery.

[0003] In this open craniotomy, a bar hole (through hole by a drill) is first drilled in a required portion of the skull so that the tip of the bone cutting saw can be inserted, and the inserted bone cutting saw is operated from this bar hole. The skull is incised into the desired shape.

Therefore, a cap having a substantially mushroom shape has been used to perform brain surgery through such a burr hole and then repair the skull. Especially after surgery
In order to discharge blood or the like filled in the head, a cap having a through hole penetrating in the vertical direction has been used in the central part.

The invention of Japanese Utility Model Publication No. 6-3611 relates to such a bar hole cap. In this invention, as shown in FIG. 7, the through hole K penetrating in the vertical axis direction of the bar hole cap C3 is provided with an umbrella portion. It is formed as a notch K in the radial direction of A and the shaft B. By attaching this barhole cap C3 to the skull,
When inserting the catheter for discharge, the catheter can be stably fixed in a predetermined direction, and there is an effect that it does not hinder exercise or the like.

[0006]

2. Description of the Related Art Even when a radial notch is formed as in the conventional barhole cap having the above-mentioned through hole, the insertion of the catheter for discharging intracranial discharge has a barhole cap. It was done after fixing to the burr hole formed in the skull. Therefore, when the tip of the catheter is applied to a desired site in the brain, the field of view is very narrow, and the work of determining the direction and position thereof is bothersome and time-consuming.

[0007]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present invention relates to a burr hole cap, in which the tip of the catheter is applied to a desired site in the brain, and the burr hole is formed from the burr hole formed in the skull. An object of the present invention is to ensure a sufficient field of view and to securely fix the burr hole cap and the catheter.

[0008]

In order to solve the above-mentioned problems of the prior art, the present invention has a substantially mushroom shape and is provided with notches in the radial direction so as to communicate the inside and the outside of a living body. It is intended to provide a bar hole cap in which a projection is formed in the cutout so as to partially close the cutout.

[0009]

The barhole cap of the present invention configured as described above has a substantially mushroom shape composed of an upper umbrella portion and a lower shaft portion, and is provided with a notch portion penetrating in the vertical direction thereof. First, by utilizing the notch, it is possible to adjust the orientation and insertion angle of the catheter relatively freely, and it is possible to prevent it from interfering with exercise, etc. As an action, it becomes possible to insert the catheter into the head first through the burr hole formed in the skull, perform the direction determination and the position adjustment, and then install the burr hole cap.

Further, in the bar hole cap of the present invention, a projection is formed in the cutout so as to partially close the cutout. This is because a catheter made of an elastic body (usually plastic) is aligned with the protrusion and pinched with a finger to be deformed and pushed into the notch, and when the deformed state is released, the catheter can be held inside the notch. it can.

At this time, if the barhole cap is vertically movable with respect to the catheter having the tip inserted into the head, the catheter can be extremely easily and surely prevented from coming out of the notch. A hole cap can be installed inside the bar hole.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a bar hole cap C of the present invention. The cap C has a substantially mushroom shape, and both a disc-shaped umbrella portion A and a shaft portion B are integrally formed, and these umbrella portions are formed. A notch K in the radial direction is formed on both the shaft A and the shaft B while penetrating in the axial direction of the cap C. The umbrella portion A has a disc shape, and the circular side portion has a rounded shape, and the top surface (upper surface) has a curved surface of about 10 to 150 R to approximate the average roundness of a human skull. It is formed in a state (see FIG. 3).

Further, in the cutout portion K, a projection P is provided from the side surface K1 toward the opposite side surface K1 so as to close a part of the cutout portion K, and is 1/3 to 1/3 of the transverse width w of the cutout portion K. It is formed with a length of about 2/3.

A schematic view of the cap C attached to the skull F is shown in FIG. 2 (shown in the section XX in FIG. 1),
The shaft portion B is inserted into the burr hole M, and the umbrella portion A is brought into contact with the outer surface of the skull F, so that the cap C is stopped and stably seated on the skull F. As a result, excrements such as blood in the skull F are led out into the body through the catheter T inserted through the notch K.

Further, since the cap C has the notch K in the radial direction, the direction and insertion angle of the catheter T can be adjusted relatively freely, and the catheter T can be stably fixed. It is possible not to interfere with exercise or the like.

Further, since the cap C has the notch K formed therein, it is possible to insert the catheter T into the head in advance and to set the cap C after the orientation and the position adjustment are performed. Is. According to this method, when the catheter T is inserted into the head, the cap C does not block the visual field in the brain narrowly, so that the tip of the catheter T can be swiftly and accurately located at the position where blood, excrement, etc. are accumulated. Can be applied. At this time, the projection P formed inside the notch K causes the catheter T to be inserted into the notch K.
Does not come out to the side of the cap C, that is, it is possible to pull out only from the upper side of the cap C,
In this state, the cap C is attached to the skull F along the catheter T.
The cap C can be automatically moved to a position directly above the bar hole M by lowering the cap C toward the position above the bar hole M. After a slight fine adjustment, the cap C is fitted into the bar hole M as shown in FIG. You can do it.

In addition to the method of inserting the catheter T into the notch K from the upper side of the cap C, the other way of inserting the cap C is to cut the tip of the catheter T from the upper side of the notch K. It is possible to use a method of passing it through K, or a simple method of pushing the catheter T inwardly of the notch P by deforming it by pinching the catheter T with the protrusion P with a finger.

Next, another embodiment is shown in FIGS.
First, FIG. 3 shows the cap C1 in which the protrusion P in the cutout K is formed at the position of the shaft B, not at the position of the umbrella A. Thus, the size and shape of the protrusion P are arbitrary. Can be decided.

The polyethylene cap C2 shown in FIGS. 4 and 5 is one in which the projection P1 in the notch K is rotatable, that is, the projection P1 is capped as shown in the bottom view of FIG. Separated from the main body of C1, this is rotatably locked by a screw pin S (only the head is shown, the other parts are not shown) made of polyethylene or titanium alloy, and the same as shown in FIG. As shown in FIG. 7B, the notch K is not closed at all, and it can be rotated from the notch K to a state where the crosswise width w of the notch K is covered.

As an advantage of the structure of the notch K and the projection P1 in the cap C2, the gap between the catheter T and the cap C2 can be made as small as possible, and the risk of infection or the like can be suppressed.

Further, the perspective view of FIG. 6 shows a polyethylene cap C4 of another form in which the projection P1 is rotatable. The cap C4 is provided with the protrusion P1 at a slightly upper position.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and any form can be adopted without departing from the object of the invention.

[0023]

As described above, according to the present invention, the direction and insertion angle of the catheter can be adjusted relatively freely by the notch portion of the barhole cap in the radial direction, and the movement and the like can be prevented. In addition, it is possible to insert the catheter into the head first through the burr hole formed in the skull, and after positioning and adjusting the position, it is possible to install the burr hole cap. In addition, for example, by a projection that partially closes the notch,
A catheter made of an elastic body (usually plastic) is fitted to the above protrusion with fingers and deformed to push it into the notch from the side, and when the deformed state is resolved, the catheter is held in the notch In this state, if the barhole cap can be moved up and down with respect to the catheter with the tip inserted inside the head, the barhole cap can be attached very easily and reliably without the catheter coming out of the notch. It has an extremely excellent effect that it can be installed in the barhole.

[Brief description of drawings]

FIG. 1 is a perspective view of a bar hole cap of the present invention.

FIG. 2 is a diagram showing a schematic view in which the barhole cap of FIG. 1 is attached to a skull as a cross section taken along line XX in FIG.

FIG. 3 is a perspective view of a barhole cap according to another embodiment of the present invention.

FIG. 4 is a perspective view of a barhole cap according to another embodiment of the present invention.

5 is a bottom view of the barhole cap of FIG. 4,
(A) is a state in which the projection does not block the notch,
(B) shows a state in which the projections cover the entire crosswise width of the notch.

FIG. 6 is a perspective view of a barhole cap according to another embodiment of the present invention.

FIG. 7 is a perspective view of a conventional barhole cap.

[Explanation of symbols]

C, C1, C2, C4: Barhole cap (or cap) A: Umbrella part B: Shaft part K: Notch part F: Skull T: Catheter P, P1: Protrusion w: Cross width S: Screw pin

Claims (2)

[Claims] 1. A substantially mushroom-shaped body made of ceramic, titanium, or other material having no biocompatibility, which is excellent in biocompatibility, and is provided with a radial notch for communicating the inside and outside of the body. In addition, a brain surgery barhole cap having a protrusion formed in the notch. 2. The brain surgery barhole cap according to claim 1, wherein the protrusion is rotatable.