JPH0438812Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to surgical instruments, and more particularly to surgical instruments suitable for use in bone biopsy procedures.

If a bone tumor is believed to be present, it may be appropriate to perform a biopsy, which involves taking samples of bone material from multiple points distributed throughout the bone to determine the nature and extent of the tumor.

The current routine method for this purpose involves making a large incision to access the bone to obtain the desired sample, which is then cut into pieces, usually using an osteotome.

However, such a method has the disadvantage that the tumor spreads along the incision and carries the risk of extensive tissue necrosis.

These risks may be irrelevant when the bone condition requires early surgery with similar large incisions for tumor removal, but they may be significant when such surgery is not an essential procedure. It becomes a problem.

The present invention was created in view of the above points,
The aim is to improve the above situation by providing an instrument with which a biopsy bone material sample can be excised in a less destructive manner.

According to the present invention, the object is to provide a cylindrical member having a predetermined diameter, a first handle provided at one end of the cylindrical member to move the cylindrical member in the longitudinal direction, and a cylindrical member having a predetermined diameter. a first sleeve member that is shorter than the member in the longitudinal direction and rotatably and slidably receives and guides the cylindrical member; and a first sleeve member provided at one end of the first sleeve member to rotate the first sleeve member. a second handle disposed at the other end of the first sleeve member for cutting a bone sample; a crown-shaped serrated member having a thickness thinner than a wall thickness of the first sleeve member over a predetermined longitudinal length so as to regulate the distance; and a crown-shaped sawtooth member that rotatably and slidably receives and guides the first sleeve member. Second to do
a third handle provided at one end of the second sleeve member for holding the second sleeve member; and a third handle provided at the other end of the second sleeve member for penetrating the bone. This is accomplished by a surgical instrument having a penetrating member.

The orthopedic instrument provided by the present invention includes a telescopic-like telescopic cylindrical member, a first and a second
An assembly having a sleeve member having three elongate members of different lengths longitudinally and rotatably and slidably interconnected as inner, intermediate and outer members.

The three members are sequentially removable from the assembly at one end and individually project from the other end.

The inner member, which is a cylindrical member, is the longest member and has a knob-shaped handle at one end and a rigid, barrel-shaped end.

The intermediate member as the first sleeve member is a sleeve having a T-shaped handle at one end and a relatively short thin-walled longitudinal section at the other end, the terminal end of the longitudinal section having a crown-like serration. Teeth are provided to form a perforator (coronal saw).

The outer member as the second sleeve member is the shortest member and has at one end a piston grip-type handle wider than the T-handle and at the other end has a longitudinal projection as a penetrating member for penetrating the bone. It has the form of a sleeve with a yong.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

The illustrated instrument is represented as a telescopic assembly of three mutually removable telescopes.

The three members are shown in the radial direction as an outermost member 10, which is a sleeve member, an intermediate member 20, which is another sleeve member, and an innermost member 30, which is a cylindrical member.

The three elongate members have different lengths, with member 10 being the shortest and member 30 being the longest.

The outermost member 10 is constituted by a sleeve 11 of circular cross section with a piston grip type handle 12 extending from one end, usually like a piston grip.

The other end of the member 10 is provided with a small number of relatively short piercing spikes or other axial projections 13 for stable penetration of the bone.

The intermediate member 20 includes a sleeve 21 having a circular cross section and rotatably and slidably accommodated within the sleeve of the member 10 .

One end of the member 20 is provided with a T-shaped handle 22 which does not project radially beyond the piston grip handle 12, and around the other end there are teeth 23 as a crown saw for use as a crown saw. It is formed.

In this connection, the short longitudinal section 24 at the other end of the sleeve 21 has a reduced wall thickness to allow for the serrations, so that the teeth do not extend further laterally than the remainder of the sleeve. do not have.

The innermost member 30 is a solid, rigid rod 31 with a knob-type handle 32 at one end and a stubby at the other end.

Applications of this surgical instrument include using the entire assembly for small localized incisions through the bone of interest.

In this case, the innermost member 30 functions as a blunt trocar for ablating tissue and locating it relative to bone.

The outermost member 10 is then squeezed and the bone is penetrated by the spikes 13.

In this state, the innermost member 30 is removed, the intermediate member 20 is grasped and rotated to cut out the bicortical core sample, and members 20 and 30 are removed.

Subsequently, member 10 is cut away, member 30 is reinserted into member 20, and a sample for analysis is removed.

It is advantageous for the procedure to select different configurations of the handle for the three members of the surgical instrument according to the invention.

Otherwise, a complicated process is required due to the hands working in close proximity.

Although the invention has particular application in bone biopsy procedures, it has recently been discovered that it has other uses as well. For example, it has been found that the device of the present invention is suitable for alleviating conditions in which avascular necrosis of bone occurs by drilling into the affected bone.

Since the surgical instrument of the present invention has the above-described configuration, when the first sleeve member is inserted into the bone sample to cut the bone sample, the coronal shape for cutting the bone sample is inserted. Because the serrations have a wall thickness that is less than the wall thickness of the first sleeve member, the coronal serrations first smoothly enter the bone sample by a longitudinal length of the serrations. The thick walled portion of the first sleeve member may be reached, making it difficult to smoothly penetrate into the bone sample, and the person conducting the examination will be able to confirm that sufficient depth has been reached to cut out the desired bone sample. Therefore, excessive insertion of the first sleeve member into the bone sample can be prevented, and the burden on the subject's body can be kept to the necessary minimum. .

[Brief explanation of the drawing]

The accompanying drawings are longitudinal cross-sectional views of presently preferred embodiments of the invention. 10, 20, 30... Member, 11, 21... Sleeve, 31... Rod, 12, 22, 32...
handle.

Claims (1)

[Scope of utility model registration request] a cylindrical member having a predetermined diameter; a first handle provided at one end of the cylindrical member to move the cylindrical member in the longitudinal direction; a first sleeve member that rotatably and slidably receives and guides the shaped member;
a second handle at one end of the first sleeve member for rotating the sleeve member; and a second handle at the other end of the first sleeve member for cutting the bone sample; a coronal shape having a thickness thinner than the wall thickness of the first sleeve member over a predetermined longitudinal length so as to limit the distance of movement in the longitudinal direction of the first sleeve member when cutting the first sleeve member; a sawtooth member, a second sleeve member rotatably and slidably receiving and guiding the first sleeve member, and a second sleeve member provided at one end of the second sleeve member to hold the second sleeve member. 3 and a penetrating member at the other end of the second sleeve member for penetrating bone.