JPH0444751A - Sucking type living body inspecting needle - Google Patents

Abstract

PURPOSE:To satisfactorily release the negative pressure added to a collected tissue or body fluid by forming an air hole in a determined position on the outer circumference of a cylinder, and moving a plunger further backward from sucking motion end position to send the outside air into the cylinder. CONSTITUTION:A cap 2 is opened to set a plunger 4 having an inner needle 6a, and at the point of time when the plunger 4 is received in the cylinder 1, the cap 2 is closed. When the top end of a double needle 6 is stuck to the lesion of a patient, and a lever 5 is pulled to this side with putting the thumb on the back surface of the cap 2 and lightly pinching the cylinder 1, a negative pressure is generated in the cylinder, and the tissue or body fluid is sucked into the cylinder from the lesion. After completion of collecting the tissue, the lever 5 is slightly turned and fixed to a notch 3a. Thus, the plunger 4 is prevented from be returned back by the negative pressure. In this state, the sucking type living body-inspecting needle is pulled out from the lesion. There after, the lever 5 is further pulled backward, whereby the outside air enters into the cylinder 1 through an air hole 1a to release the negative pressure in the cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aspiration biopsy needle, and more particularly to an aspiration biopsy needle for collecting tissue or body fluid from an affected area.

[Prior Art] A suction biopsy needle is used to collect and test tissue and body fluids from a living body. This suction-type biopsy needle inserts the needle at the tip of the cylinder into the affected area and moves the plunger inside the cylinder toward you to generate negative pressure inside the cylinder, thereby aspirating tissue and body fluids inside the organ. It is something to do. After the tissue has been collected, the biopsy needle is removed from the affected area while maintaining negative pressure in the cylinder to prevent backflow of the collected tissue.

At this time, if the biopsy needle is left with negative pressure applied, the collected tissue will collapse due to the negative pressure.
As a result, accurate histopathological diagnosis may be hindered. For this reason, conventionally, after removing the biopsy needle from the affected area,
A needle provided at the tip of the cylinder was removed from the cylinder to supply outside air into the cylinder.

[Problem to be solved by the invention]

However, releasing the negative pressure in the cylinder using the above method is complicated in operation, and does not sufficiently meet the demand for quickly releasing the negative pressure.

[Purpose of the invention]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a suction type biopsy needle that can effectively release the negative pressure applied to collected tissue and body fluid.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a ventilation hole at a predetermined position on the outer periphery of the cylinder, moves the plunger further rearward from the suction operation end position, or provides a ventilation hole at a predetermined position on the outer periphery of the cylinder, or moves the plunger further rearward from the suction operation end position. By breaking the crotch after the suction operation is completed, outside air is sent into the cylinder.

(Function) As described in -, the present invention sends outside air into the cylinder by moving during the plunge or by breaking a predetermined membrane. Negative pressure in the cylinder can be released quickly by an extremely simple operation without requiring any additional operations.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the configuration of the aspiration biopsy needle of this example in a front view (
A) and a plan view (B). The suction type biopsy needle includes a cylinder 1 that stores the affected tissue or body fluid;
It consists of a lid 2 that opens and closes the rear of the cylinder 1, a plunger 4 that slides inside the cylinder 1 to generate negative pressure within the cylinder 1, and a double needle 6 that is inserted into the affected area.

A guide slit 3 is formed at a symmetrical position on the side surface of the cylinder 1. This guide slit 3, plunger 4
It guides a lever 5 provided at the end of the rod 4a, and the tip of the bar 5 projects outward from the slit 3 and slides along the slit 3. A notch 3a is formed at the rear end of the slit 3 in order to fix the lever 5 so that it does not return to the double needle 6 side.

A ventilation hole 1a is formed in front of the guide slit 3 of the cylinder 1. This vent hole 18 releases the negative pressure inside the cylinder 1 after tissue sampling is completed, and becomes in communication with the outside air when the plunger 4 slides to the rear of normal tissue sampling.

The plunger 4 slides in close contact with the inner surface of the cylinder 1 and generates negative pressure within the cylinder 1 by sliding backward. The inner needle 6a of the double needle 6 is fixed to the tip of the plunger 4, and the above-mentioned rod 4a is connected to the rear end. Further, the lever 5 is fixed to the rear end of the rod 4a.

As shown in FIG. 2(A), the double needle 6 consists of an inner needle 6a with a sharp tip and an outer needle 6b, with the inner needle 6.1 being able to slide inside the outer needle 6b.

The rear end of the inner needle 6a is fixed to the tip of the plunger 4 as described above, and the rear end of the outer needle 6b is fixed to the cylinder l via the coupling part 7. Further, as shown in FIG. 2 (D3), the double needle 6 includes an inner needle 63 having a uniform thickness over its entire length, and an outer needle 6b (having a small diameter portion 6b1 and a medium diameter portion 6b2). It may also be configured with a medium diameter part (having a large diameter part following the ibz, but not shown).In the double side 6 of such a configuration, the inner side 6.3 and the small diameter part 6b of the outer needle 6b
+ forms a close contact part of length L5, and when the inner needle 63 is located in the close contact part ■, the negative pressure inside the cylinder 1 is increased by 1, and when its tip comes out of the close contact part I, the negative pressure increases. Outer needle 6
It is designed to be transmitted to the tip of b.

Next, the usage state and operation of the embodiment configured as described above will be explained with reference to FIGS. 3(A) and 3(B) in addition to FIG. 1.

As shown by the broken line in FIG. 1, the lid 2 is opened and the plunger 4 having the inner needle 6a is set as shown in FIG. 1. When the plunger 4 is housed in the cylinder 1, the lid 2 is closed. At this time, Reno\-5 is guided to the guide slit 3.

Next, inject the tip of the double needle 6 into the patient's affected area, and insert the thumb into the M2
When you pull the lever 5 toward you while lightly pinching the cylinder 1 between your ring finger and middle finger, negative pressure is generated inside the cylinder 1, and tissue and body fluids from the affected area are sucked into the cylinder 1.

When the tissue collection is completed and the plunger 4 reaches the position shown in FIG. 3(A), when the lever 5 is slightly turned, the lever 5 is fixed in the notch 3a and the plunger 4 is returned by negative pressure. is prevented. Then, in this state, the suction type biopsy needle is removed from the affected area.

Thereafter, in order to release the negative pressure in the cylinder 1, the lever 5 is further pulled rearward. When the plunger 4 reaches the position shown in FIG. 3(B), outside air enters the cylinder 1 through the ventilation hole 1a, and the negative pressure inside the cylinder 1 is released.

Although the ventilation hole 1a is provided independently in the above embodiment, it may be formed continuously with the guide slit 3. In this case, it is preferable to form the tip end side of the slit 3 narrowly so that the lever 5 cannot fit therein.

FIG. 4 shows the configuration of another embodiment of the present invention.

In this suction type biopsy needle, the negative pressure inside the cylinder 10 is released by pushing in a cock 12 provided on the outer periphery of the cylinder 10. This cooker 2 has a cylinder 1, as shown in CB of the same figure.
Needle 1 arranged on the raised part 10a of 0 and provided at the lower end
2a breaks the thin film 14 stretched on the cylinder 10,
This forms a ventilation hole to the cylinder 10. The mechanism of the cock 12 may be a rotating type or a sliding type in addition to the push-in type described above. The other configurations of the double needle 6, plunger 4, etc. are the same as in the above embodiment. This embodiment has the advantage that by tearing the thin film 14, the suction type biopsy needle cannot be reused, and secondary infection by pathogenic bacteria is reliably prevented.

〔Effect of the invention〕

As explained above, in the present invention, a ventilation hole is formed at a predetermined position on the outer periphery of the cylinder, and the plunger is moved further rearward from the suction operation end position, or a predetermined membrane forming a part of the side wall of the cylinder is formed. Since outside air is sent into the cylinder by breaking the cylinder after the suction operation is completed, the negative pressure applied to the tissue inside the cylinder can be effectively released, and as a result, the accuracy of pathological tissue diagnosis is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1(A) is a front view showing the configuration of an aspiration biopsy needle according to an embodiment. FIG. 1(B) is a plan view showing the configuration of an aspiration type biopsy needle according to an embodiment. FIGS. 2A and 2B are cross-sectional views showing the internal structure of the double needle. FIG. 3(A) and FIG. 3(B) are explanatory diagrams for explaining the operation of the embodiment. FIG. 4(A) is a front view showing the configuration of another embodiment of the present invention. FIG. 4(B) is a sectional view showing the configuration of the main part of another embodiment of the present invention. a a a b 6b. bz 0a 2a Code explanation Cylinder lid guide slit notch part plunger rond lever double needle inner needle outer needle small diameter part medium diameter part fixed part raised part conch needle membrane L adhering part Patent applicant Hakko Denki Seisakusho Co., Ltd.

Claims (2)

[Claims] (1) In a suction type biopsy needle that aspirates affected tissue or body fluid from the needle tip provided at the tip of the cylinder by moving the plunger inside the cylinder backwards, from the plunger position on the outer periphery of the cylinder at the end of the suction operation. A ventilation hole is formed at the rear, and by moving the plunger further rearward from the suction operation end position after suctioning the affected tissue or body fluid, outside air is sent into the cylinder through the ventilation hole. Aspiration-type biopsy needle. (2) In a suction-type biopsy needle that aspirates affected tissue or body fluid from a needle tip provided at the tip of the cylinder by moving a plunger inside the cylinder backward, the needle is inserted into a hole formed in a part of the peripheral wall of the cylinder. A suction-type biopsy needle, characterized in that a membrane is applied to the cylinder to form a sealed state, and after the affected tissue or body fluid is aspirated, the membrane is ruptured to send outside air into the cylinder.