JPH0337054A - Fitting method for hand piece - Google Patents

Abstract

PURPOSE:To easily adjust the length of a hand piece and surely fit it by inserting the tip section of the chip cover of the hand piece into the through hole of a ball joint coupled with the spherical inner hole of a fixing plate, and fastening and fixing the slot of a screw section with a wing nut. CONSTITUTION:A fixing plate 25 is moved and fixed to the target point of an operation section on a skull together with a moving block 23. The tip section 5 of the chip cover 3 of a hand piece is inserted into the through hole 6 of a ball joint assembled in the fixing plate 25, the optimum angle of the hand piece is determined, then the fixing plate 25 is fastened by a fixing screw 26 to fix the ball joint. The necessary length of the chip 2 of the hand piece is inserted into the skull from the fixing plate 25 while the scale of the tip section 5 of the chip cover 3 is read, a screw section 9 provided with the slot 8 of the ball joint is fastened by a wing nut to fix the chip cover 3, ultrasonic vibration is applied to the chip 2 to crush, emulsify, suck and remove the target point.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for attaching a handpiece to a stereotaxic fixing device, which is used to crush and suction remove biological tissue using ultrasonic vibration.

[Conventional technology]

Conventionally, in neurosurgery and neurosurgery, when removing intracerebral hematomas, etc., a suction tube has been used instead of the puncture needle of a stereotaxic fixation device to remove hematomas at specific sites. However, suction alone leaves some hematoma behind, so recently a surgical method has been used in which the hematoma is crushed by applying weak vibrations with an ultrasonic scalpel and then removed by suction.

However, when performing surgery such as intracerebral hematoma removal by inserting the handpiece tip or horn into the brain, the utmost care must be taken to avoid damaging the surrounding tissue. Even if you are careful, it is very difficult to do this without touching important parts of the brain, and the tip or horn, which is the vibrating part of the handpiece, is inserted into the needle holder, the length is adjusted, and it is fixed with a screw. However, this method uses force perpendicular to the axis of the chip's longitudinal vibration to fix the chip with screws, so the chip does not cause abnormal vibration or oscillation. There was a problem in that the surgery could not be performed satisfactorily due to fear.

[Problem to be solved by the invention]

The purpose of the present invention is to solve these problems, and it is possible to attach the handpiece of an ultrasonic scalpel to a stereotaxic device used in fields such as neurosurgery for a long time without impairing the function of the handpiece. The aim is to provide a method for easy adjustment and reliable installation.

[Means to solve the problem]

That is, the present invention provides a ball in which a cylindrical screw part with a slot in the opening of the ball part having a through hole is attached to a spherical inner hole of a fixing plate of a stereotaxic fixation device used in fields such as neurosurgery. Fit the joint, and insert the tip cover tip of the ultrasonic scalpel handpiece, which uses ultrasonic vibration to crush and suction remove living tissue, into the through hole of the ball joint. The method for attaching a handpiece is characterized in that the threaded portion is threaded and fixed by tightening with a wing nut.

Hereinafter, the invention will be described in detail based on the drawings.

FIG. 1 is an overall view showing an example of a handpiece for a stereotactic/fixation device used in the present invention. The handpiece in the present invention includes a handpiece body (1), a tip (2), and a tip cover (3). The handpiece body (1) has an electrostrictive or magnetostrictive vibrator built therein as an ultrasonic vibration source. Chip (2)
The vibrator, the nipple (4), and the nipple (4) are connected through a through hole, so that the &ll fabric crushed at the tip of the tip (2) is sucked and discharged to the outside.

Chip (2) is λ/2 smaller than the normally used chip.
A long tip is used (λ is the wavelength of ultrasonic vibration), which means that a normal tip has an effective length of about 50 to 80 mm, which means that when the handpiece is attached to the stereotaxic device, it can reach the target point in the skull. Since this distance cannot be obtained, the length of the chip (2) is increased by λ/2 to approximately 150 to 180 m. Further, it may be longer by λ or 3/2λ as required, and may be an integral multiple of λ/2.

The tip cover (3) of the handpiece in the present invention is
The length corresponds to the length of the tip (2), and the tip (
The length of the part protruding from the chip cover (3) in 2) is 5
The length of the chip cover (3) is determined to be approximately 50 mm. Also, the tip (5) of the chip cover (3)
) is made to have a slightly smaller diameter than the inner diameter of the through hole (6) of the ball joint (FIG. 2), which will be described later. Furthermore, if you put a scale on the tip (5) every 1mm and make the scale line thicker every 10mm,
It is extremely convenient to use.

Next, a stereotaxic fixing device for use with a hand piece fixed will be described.

There are currently various types of stereotaxic devices, and FIG. 4 shows an example of a brain stereotaxic system. Fixed pin (
20) is integrated with a fixing frame (21), and the skull to be operated on is inserted into the four fixing pins (20), and each fixing pin (20) is tightened to fix the skull.

The fixed frame (21) is fixed to the outer frame (22), and movable blocks (23) are attached to the upper and lower sides of the outer frame (22).
) can be moved freely in the X direction and fixed using an appropriate method such as a screw. Furthermore, a semicircular moving angle (24) has both ends connected to two moving blocks (23).
) is supported and fixed by the moving block (23
) can be moved in the X direction on the fixed frame.

A fixing plate (25) for attaching and fixing the handpiece is attached to the moving angle (24).
It is attached using an appropriate method such as screws so that it can be moved on top. The fixing plate (25) is, as shown in FIG. 4(C),
Basically, it is made up of two temporary pieces, each of which has a spherical inner hole (27) into which a ball joint as shown in FIG. 2 can be fitted and freely moved. Fixed plate (25)
A ball joint is installed in advance, and the handpiece is attached and fixed to this.

During surgery, first, the fixing plate (25) is moved and fixed together with the movable block (23) to the target point of the surgical site on the skull. Insert the tip (5) of the tip cover (3) of the handpiece into the ball jig 4/10/1 hole (6) built into the fixing plate (25), and after determining the optimum angle of the handpiece, tighten the fixing screw. Tighten the fixing plate (25) with (26) to fix the ball cylinder.Next, while reading the scale on the tip (5) of the tip cover (3), insert the hand piece from the fixing plate (25) into the skull. Insert the required length of the tip (2) part, fix the tip cover (3) by tightening the threaded part (9) of the ball shield with the wing nut shown in Figure 3, and then remove the tip (2).
Apply ultrasonic vibration to crush, emulsify, suction, and remove the target point.

The target point is determined using X-rays and a cranial atlas. Recently, a method of determining a target point using a CT scan has also been known. In addition, the handpiece and attachment for the brain stereotaxic system according to the present invention have a ball joint shape that can be attached to a fixed plate that can move in the X and Y directions even in the case of other brain stereotaxic systems other than those shown above. It is possible to apply it depending on the situation.

Next, the chip cover (3) and its attachment method will be described with reference to FIGS. 2 and 3. Chiffkate-(3)
The outer diameter of the tip (5) of the ball cylinder through hole (
For example, the inner diameter of the through hole (6) of the ball shield is controlled to have a negative tolerance of 8 mm.
s+0.1. If +0゜05m is set, the outer diameter of the tip of the tip cover (3) should be φ8 mm, -0.05mm, and the tip of the tip cover (3) should be inserted into the through hole (6) of the pole jet. The part (5) can be moved smoothly to prevent shaking. In addition, since the tip cover (3) holds the weight of the handpiece body (1) only by the tip (5) inserted into the ball joint,
It is necessary to make the wall thicker than usual, and the material is preferably a lightweight and corrosion-resistant metal such as aluminum alloy, or a plastic with excellent heat resistance such as polysulfone resin.

On the other hand, the ball part (12) of the ball joint uses the ball of the stereotaxic device or the same ball as the ball,
The cylindrical threaded portion (9) is fixed by welding, or the ball portion (I2) and threaded portion (9) are integrally processed. Also,
The threaded part (9) is provided with a slot (8), and the third
By using a thumbscrew as shown in the figure, the through hole (
The tip (5) of the chip cover (3) inserted into the tip (6) can be tightened and fixed so that it does not shift.

Chip cover (3) is the material for the ball shield.
A metal with excellent sliding properties and good corrosion resistance, such as stainless steel, aluminum alloy, or plastic, may be used, but it is best to determine the material in combination with the material of the tip cover (3). A combination such as making the tip cover (3) made of polysulfone resin and making the ball joint made of stainless steel gives good results. Also, it is best to use the same material for the thumb screw as the pole bolt.

To attach the ultrasonic scalpel handpiece to the stereotaxic device, first insert the tip cover (3) of the handpiece into the through hole (6) of the ball joint built into the fixing plate (25) of the stereotaxic device. After inserting the tip (5) and inserting the tip of the tip (2) to the specified position inside the skull, which is the surgical site, use the butterfly to fix the tip of the tip (2) so that it does not shift. Insert the screw into the threaded part of the ball joint (9)
Tighten and secure. Threaded part of ball joint (9)
is provided with a slot (8), and by tightening the thumbscrew, the threaded portion (9) of the ball shield is tightened, and the tip portion (5) of the tip cover (3) is fixed.

〔Effect of the invention〕

As described above, according to the method of the present invention, the handpiece of an ultrasonic scalpel can be reliably and easily attached to a stereotaxic fixation device without impairing its function, and the position and angle of the tip of the handpiece can be adjusted. It is easy to adjust and is extremely useful for using ultrasonic scalpels in fields such as neurosurgery.

[Brief explanation of drawings]

FIG. 1 is an overall view showing an example of a handpiece for a stereotaxic fixation device used in the present invention. Fig. 2 is a diagram showing an example of a ball joint used in the present invention, (A) is a sectional view, (B) is a side view, and Fig. 3 is a diagram showing an example of a thumbscrew. is a top view, and (B) is a side sectional view. FIG. 4 is a diagram showing a stereotaxic fixing device for fixing a hand piece in the present invention, in which (A) is a top view, CB) is a side view, and (C) is a sectional view of a fixing plate.

Claims (1)

[Claims] (1) A ball joint is attached to the spherical inner hole of the fixation plate of a stereotaxic fixation device used in fields such as neurosurgery, with a cylindrical threaded part with a slot in the opening of the ball part having a through hole. Insert the tip cover tip of an ultrasonic scalpel, which uses ultrasonic vibration to crush and suction remove biological tissue, into the through hole of the ball joint, and insert the tip cover tip with a hollow scale on the wall thickness. A handpiece attachment method characterized by tightening and fixing the slotted part with a wing nut.