JPH0317844Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a biopsy needle used to collect a portion of the liver, kidney, or other visceral tissue of a living body to obtain a basic sample for treatment of a living body disease.

[Prior Art] Conventionally, as shown in FIG. 7, this type of biopsy needle includes a tubular outer needle b equipped with a sharp cutting blade a whose tip is cut obliquely and whose end edge is open; It is equipped with an inner needle d whose tip is shaved and has a conical point c, a syringe f connected to the base e of the outer needle b, and a gasket h with the base g of the inner needle d embedded in the head. , a piston rod j which is provided with an elastic stopper piece i on the base side and can be freely inserted into and removed from the syringe f is known. Then, insert the inner needle d from the tip into the base side of the syringe f, advance the gasket h of the piston rod j to the tip of the syringe f, and insert it from the cutting blade a of the outer needle b as shown in Figure 8A. The pointed head c of the inner needle d is made to protrude, and the needle is punctured into the living body in this protruding state. Next, as shown in Figure 7, the piston rod j is moved backward, and the stopper piece i of the piston rod j is locked to the rear end f' of the syringe f, so that the point c of the inner needle d is connected to the outer needle as shown in Figure 8B. syringe f to form a space k at the tip of the outer needle b, and apply negative pressure generated in the syringe f to the gap l formed between the inner surface of the outer needle b and the outer surface of the inner needle d. A negative pressure is applied to the space k through the space k to sample tissue within the space k.

However, with such a configuration, when retracting the piston rod j to apply negative pressure to the space k at the tip of the outer needle b, the stopper piece i of the piston rod j is locked to the rear end f' of the syringe f. It was preventing the piston rod from moving forward. Therefore, when applying negative pressure, it is necessary to lock the stopper piece i to the syringe f, so the negative pressure applied to the space k at the tip of the outer needle b is always constant.
There was a problem in that it was not possible to adjust the negative pressure to an arbitrary level corresponding to the time of tissue collection, and it was also impossible to raise the negative pressure by retracting the piston rod j.

[Problems to be Solved] The present invention aims to solve these conventional problems and provide a biopsy needle that can apply any negative pressure to the outer needle in response to tissue sampling and is easy to operate. It is something to do.

[Means for Solving the Problems] The present invention was made to solve the above-mentioned problems, and includes a tubular outer needle in which the outside of the open tip is cut into a cutting blade, and the outer needle. A removable inner needle whose sharp pointed end protrudes outward from the cutting blade when inserted into the outer needle from the base, a syringe that can be removably attached to the base of the outer needle, and a syringe. A piston rod equipped with a gasket that airtightly slides against the inner surface of the syringe when inserted into the syringe, and a piston rod installed between the base of the outer needle and the syringe to direct gas flow from the outer needle side toward the syringe side. and a check valve.

[Example] The present invention will be explained below with reference to the drawings.

1 to 6 show one example of implementing the present invention.

In the drawing, 1 is an outer needle, 2 is an inner needle, 3 is a syringe,
4 is a piston rod, and 5 is a check valve.

The outer needle 1 has a cutting blade 6 which is opened to the outside by cutting the tip 1a of a tubular body diagonally, and has a base 1b through which an inner needle 2 (described later) passes through the base 1b. A cylinder 7 was provided.

The inner needle 2 has a tip 2a cut obliquely to have an inclined sharp point 8, and is provided so as to be freely inserted and removed into the outer needle 1 from the base 1b of the outer needle 1. When inserted into the needle 1, the tip 2a as shown in the second diagram.
A sharpened pointed head 8 projects outward from the cutting blade 6 of the outer needle 1 and closes the tip 1a of the outer needle 1. In addition, the base 2b of the inner needle 2 has a base 1 of the outer needle 1.
An engaging portion 9 that engages with the base tube 7 provided in b is provided.

The syringe 3 consists of a guide tube 3a and a beak tube 3b that is detachably connected to the base tube 7 of the base portion 1b of the outer needle 1 at its tip.

The piston rod 4 is a guide tube 3a of the syringe 3.
A rod 4a that can be inserted into and removed from the inside of the rod 4a, and a gasket 4b that slides in airtight contact with the inner surface of the guide tube 3a at its tip.
It consists of

The check valve 5 has a valve housing provided with ventilation passages 10a and 10b at the front and rear, respectively, as shown in FIGS. 1 and 3.
and a membrane-like valve body 1 made of a flexible material held approximately only in the center by legs 10c within the valve housing 10.
1, and as shown in the fourth figure, a base tube 7 provided at the base 1b of the outer needle 1 and one air passage 10a of the valve housing 10 of the check valve 5 are made of a flexible material. Furthermore, the beak tube 3b of the syringe 3 and the other ventilation passage 10b of the valve housing 10 are connected via a tube 12 consisting of
are connected via a tube 13 made of a flexible material, and when the gas flows in the forward direction from the outer needle 1 side toward the syringe 3 side, the valve element 11 prevents the gas from flowing toward the outer needle 1 side. I made it possible. Then, the piston rod 4 inserted into the guide tube 3a of the syringe 3
When the syringe 3 is retracted to generate a negative pressure, the air A in the outer needle 1 enters through the air passage 10a on one side of the valve housing 10 as shown by the arrow in the third figure, and flows through the valve as shown in the imaginary line. The body 11 is pressed, its peripheral edge part is separated into the valve casing 10, passes through the gap s created when the body 11 is separated, and between the legs 10c, and then the valve casing 10.
When the piston rod 4 enters the syringe 3 through the other air passage 10b and applies negative pressure to the outer needle 1, and the piston rod 4 stops moving back, the valve body 11 is pressed by the air pressure inside the syringe 3, and the valve body 11 is pressed as shown by the solid line. The piston rod 4 returns to its original position and closes the air passage 10a on one side of the valve housing 10 to prevent backflow of air and to prevent the piston rod 4 from moving forward.

In the illustrated example, the outer needle 1 is made of an elastic material and has an outer diameter smaller than the inner diameter of the outer needle 1, as shown in FIG.
The insertion rod 14, which has a bent part 14a that presses against the inner surface 1c of the outer needle 1 when inserted into the outer needle 1 from the base 1b of the outer needle 1, is inserted into the outer needle with the inner needle 2 removed from the outer needle 1. 1, the bent part 14a of the insertion rod 14 presses against the inner surface 1c of the outer needle 1 to prevent it from coming out easily from the inside of the outer needle 1, and also to prevent the inner surface 1c of the outer needle 1 and the insertion rod 14 from coming out easily. A gap 15 is formed between the tip 1a of the outer needle 1 and the end 1 of the insertion rod 14.
4b, a space 16 for tissue collection is formed.

To explain the operation for extracting visceral tissue from the product configured as above, first, the inner needle 2 is inserted into the outer needle 1 as shown in the second figure, and the inner needle 2 is assembled into one body as shown in FIG. 6A. Puncture to or near the target site. Next, the inner needle 2 is removed from the outer needle 1 as shown in FIG. 6B, and then the insertion rod 14 is inserted into the outer needle 1 as shown in FIGS. 5 and 6C.
4 is pressed against the inner surface 1c of the outer needle 1 to form a gap 15 inside the outer needle 1.
A space 16 is formed at the tip. Further, as shown in FIGS. 4 and 6D, there is provided a check valve in which tubes 12 and 13 are connected at the front and rear, respectively, between the base tube 7 of the base 1b of the outer needle 1 and the beak tube 3b of the syringe 3. 5
Concatenate. Then, the piston rod 4 is moved back to generate a negative pressure inside the syringe 3, and this negative pressure is passed through the check valve 5 and the gap 15 formed in the outer needle 1, and is applied to the tip of the outer needle 1. Space part 1
Apply negative pressure to the cutting blade 6, insert the tip 1a of the outer needle 1 into the affected area as shown in FIG. 6E, and rotate the outer needle 1 in its circumferential direction as shown in FIG. 6F. The tissue is cut and collected into the space 16, and then the outer needle 1 is removed from the living body.

With the above structure, when negative pressure is applied to the tip of the outer needle 1, the stopper piece of the piston rod 4 is locked to the syringe 3 by the operation of the valve body 11 of the check valve 5, as in the conventional case. Retraction of the piston rod 4 can be stopped at any position without any operation. Therefore, it is possible to apply any negative pressure to the outer needle 1 in accordance with the time of tissue collection, and
By retracting the piston rod 4 again, negative pressure can be applied to the outer needle 1 again, so the operation is extremely simple.

In the drawings, reference numeral 17 denotes a locking piece provided in the engaging portion 9 of the base 2b of the inner needle 2, and is locked in a recess 18 provided in the base cylinder 7 of the base 1b of the outer needle 1, so that the inner needle 2 Outer needle 1
prevent it from rotating inside.

In the embodiment described above, the tip 2a of the inner needle 2 is cut obliquely to form a pointed part 8 with an inclined cut.
It is also possible to create a sharp point by cutting it into a conical shape.

Further, although the tip 1a of the outer needle 1 is cut at an acute angle with respect to the axis, it may be cut at an obtuse angle or a right angle.

Furthermore, although a manual means consisting of a syringe 3 and a piston rod 4 was used as means for applying negative pressure into the outer needle 1, a small-sized vacuum pump may also be used.

[Effect of the invention] As described above, according to the present invention, when the inner needle is inserted from the base of the tubular outer needle, the point of the inner needle is made to protrude from the cutting blade of the outer needle. In addition, a check valve is provided between the base of the outer needle and the syringe to allow the gas to flow in the forward direction from the outer needle side to the syringe side. When the removable piston rod is retracted, the negative pressure generated inside the syringe can be reliably applied to the outer needle through the check valve, and the syringe and piston rod can be connected to each other by the stopper piece as in the past. The retraction of the piston rod can be stopped at any position without performing a stopping operation. Therefore, it is possible to apply any negative pressure to the outer needle in accordance with the time of tissue collection, and it is possible to operate it extremely easily.

[Brief explanation of drawings]

Figures 1 to 6 show an example of the implementation of the present invention, in which Figure 1 is an exploded perspective view, Figure 2 is a cutaway side view showing the inner needle inserted into the outer needle, and Figure 3 is a cutaway side view showing the state in which the inner needle is inserted into the outer needle.
The figures are a cross-sectional view taken along the line -- in Fig. 1, Fig. 4 is a side view showing the state in which the syringe is connected to the base of the outer needle, and Fig. 5 is a cut-away side view showing the state in which the insertion rod is inserted into the outer needle. , FIG. 6 is an explanatory diagram showing how the product of the present invention is used, FIG. 7 is a cutaway side view of the conventional product, and FIG. 8 is an explanatory diagram showing how the product is used. 1...Outer needle, 1a...Tip of the outer needle, 1b...Base of the outer needle, 2...Inner needle, 2a...Tip of the inner needle, 3...Syringe, 4...Piston rod, 4b...Gasket, 5
...Check valve, 6. Cutting blade, 8. Point head.

Claims (1)

[Scope of utility model registration request] A tubular outer needle with the outside of the open tip cut into a cutting blade, and a sharp point cut into the tip protrudes outward from the cutting blade when inserted into the outer needle from the base of the outer needle. A syringe that can be freely inserted and removed from the base of the outer needle, a piston rod that is equipped with a gasket that airtightly slides on the inner surface of the syringe when inserted into the syringe, and a base of the outer needle and the syringe. A biopsy needle consisting of a check valve disposed between the outer needle side and a check valve that allows gas to flow in the forward direction from the outer needle side to the syringe side.