JPH045149Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a biopsy needle used in the medical field for collecting cell tissue from an affected area of a patient.

[Conventional technology]

Conventional biopsy needles are assembled by connecting the inner needle to the piston of the suction tube that generates negative pressure, so the inner needle and piston cannot be separated. The shape of the piston with the inner needle necessarily distinguishes it from the normal syringe section, and is distinguished from the regular syringe section, as a special instrument for collecting a piece of diseased tissue from a patient. Therefore, it is difficult to use the suction barrel and piston of a biopsy needle of the same shape as a normal syringe for other purposes.

[Problem that the invention attempts to solve]

As mentioned above, there were problems such as a lack of versatility in the field of dedicated special testing instruments, so we have once again tried to improve the versatility of the piston with the inner needle in the suction cylinder. The problem was to make it possible to add the function of a conventional biopsy needle to a suction barrel of a syringe or the like that had the standard.

[Means to try to solve problems]

In order to solve this problem, the conventional double needle structure part (shown) can be freely joined or separated from the suction tube of a standard syringe to remove the patient's affected tissue. In order to be able to collect samples, we improved the conventional piston type with an inner needle, separated the inner needle and piston instead of integrating them, created a flange structure with an inner needle, and attached a coiled spring to the inner needle. We equipped it and assembled it into a normal syringe (see Figure 2), which served as a means to solve the problem. The outer needle has a stepped needle tube with a tapered aperture, the inner needle has an outer diameter that can be slid closely against the inner diameter of the tapered aperture portion of the outer needle, and the inner needle is equipped with the coiled spring. The spring is formed so that its extension length when the suction piston is completely released is slightly longer than the desired length of the tapered constricted portion of the outer needle. When the piston is completely released from the pressure of the piston, the piston and its flange become free, and the position of the inner needle's cutting edge retracts to the inside of the outer needle's tip drawing step and is in contact with the inner needle's cutting edge. The section with the inside of the cylinder is in the same state, and continued piston pulling operation increases the negative pressure inside the suction cylinder, and this negative pressure is configured so that it is strongly transmitted to the cutting edge of the outer needle. That is, the solution of the present invention solves the problem by connecting a flange to the inner needle and incorporating a coiled spring into the inner needle in order to make it possible to assemble the double needle of the above structure into a normal syringe syringe. A solution has been achieved.

[Example of idea]

FIG. 1 is a side sectional view of a conventional embodiment.
The biopsy needle 1 is constructed by connecting an inner needle 1b to a suction piston 1a, and an aspiration tube 1c having a stepped outer needle 1d with a tapered tip connected to an outer needle base 1e, and is assembled as shown in the figure. has been completed. Inner needle 1b and outer needle 1
d is a double-needle state with the cutting edge of the inner needle slightly protruding from the patient's affected tissue (not shown, the same applies hereinafter), and the suction piston 1a is used to collect the tissue piece by suction. This is done while pulling to generate a negative pressure inside the suction tube 1c. During this time, the cutting edge of the inner needle 1b touches the outer needle 1d.
The generated negative pressure is transmitted to the cutting edge of the outer needle 1d when it reaches the inner side from the tapered step portion of the outer needle 1d, and strongly holds the tissue piece being collected by suction.

FIG. 2 is a side sectional view of one embodiment of the present invention. The biopsy needle 2 is composed of a suction tube 2a, an inner needle 2b, a stepped outer needle 2d, an outer needle base 2e, a flange 2f with an inner needle, a coiled spring 2g, etc., and is assembled as shown. The suction piston 2a is the inner needle 2
b is inserted into the suction tube 2c in a state independent of that to constitute a normal syringe, and a stepped outer needle 2d with a tapered diaphragm
is combined with the outer needle base 2e and assembled to form a stepped outer needle, and the inner needle 2b has an outer diameter that slides closely against the inner diameter of the tapered constricted portion of the outer needle 2d.
Further, a flange is connected to the inner needle 2b by welding or the like to form a flange 2f with an inner needle.A coiled spring 2g is inserted into the inner needle 2b, and the pressure of the suction piston 2a is applied to the piston 2a. When the spring is completely released by pulling it with the suction operation, the spring 2g
The extended length of the inner needle 2b is configured to be slightly longer than the section from the cutting edge of the outer needle 2d to the step of the tapered drawing part, and when the pressure is completely pressed, the cutting edge of the inner needle 2b is the outer needle. The length of the inner needle 2b is formed so that it slightly protrudes from the cutting edge of the needle 2d (as shown). In use, the biopsy needle 2 is inserted into the patient's diseased tissue (not shown, the same applies hereinafter) in the state shown in the figure, the suction piston 2a is pulled in the direction of the arrow,
During the suction operation, the pressure of the spring 2g is released, and the inner needle 2b starts suctioning the patient's tissue piece due to the reaction of the spring 2g. When reaching inward from the step, the cutting edge of the outer needle 2d and the inside of the suction cylinder 2c are in the same state, and the negative pressure inside the suction cylinder 2c generated by the suction operation of the piston 2a is applied to the outer needle. It reaches the blade edge 2d and strongly suctions and holds the patient tissue piece being collected by suction.

[Effect of idea]

As described above, according to an embodiment of the present invention, the configuration allows the biopsy needle to be configured by extremely easily assembling into a normal syringe syringe, and it is possible to extremely forcefully extract a piece of diseased tissue from a patient. Moreover, it has the effect of reliably holding the tissue piece.

[Brief explanation of the drawing]

FIG. 1: Side sectional view of the previous position embodiment. Second
Figure: A side sectional view of a positional embodiment of the present invention. 1...biopsy needle, 1a...suction piston, 1b...
...Inner needle, 1c...Suction tube, 1d...Outer needle with tapered orifice step, 1e...Outer needle base, 2...Biopsy needle, 2a...
...Suction piston, 2b...Inner needle, 2c...Suction tube, 2d...Outer needle with tapered orifice step, 2e...Outer needle base, 2f...Flange with inner needle, 2g...Coil-shaped spring.

Claims (1)

[Scope of utility model registration request] A biopsy needle with a double needle structure includes a stepped outer needle having a tapered constriction shape of a desired length, and an inner diameter having an outer diameter that can closely slide on the inner diameter of the tapered constriction portion of the outer needle. a needle, a flange with an inner needle that is coupled to the end of the inner needle, and a flange that is equipped on the inner needle so that the elongation when the pressure is released is slightly longer than the desired length of the tapered constricted portion of the outer needle; A biopsy needle characterized by comprising a coiled spring and assembled into a syringe suction barrel.