JP4554750B2 - Endoscopy tissue collection tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope tissue collecting tool that is used to perform a liver biopsy or the like by being inserted into and removed from a treatment instrument insertion channel of an endoscope.
[0002]
[Prior art]
FIG. 6 shows a tip portion of a so-called Menghini tissue collection needle used as a conventional endoscope tissue collection tool. A sharp needle tip 11 is formed at the tip of a rod-shaped needle shaft 10. The tissue storage recess 12 for storing the cut specimen tissue is formed in a shape in which the vicinity of the needle tip 11 is recessed from the side surface. FIG. 7 is a cross-sectional view of a cross section of the needle shaft 10 in the tissue storage recess 12 perpendicular to the axis.
[0003]
An annular blade 21 is formed on the inner peripheral side of the outer tube 20 that is fitted to the needle shaft 10 so as to be movable back and forth in the axial direction.
[0004]
8 and 9 show a state in which a biopsy tissue is collected using such a conventional endoscope tissue collecting tool. As shown in FIG. The tube 20 is pulled back slightly to insert the target portion of the tissue 100 into the tissue storage recess 12, and then, as shown in FIG. 9, the mantle tube 20 is instantaneously sent out from the tissue 100 entering the tissue storage recess 12. The specimen tissue 101 is cut out.
[0005]
[Problems to be solved by the invention]
However, the needle shaft 10 having a cross-sectional shape as shown in FIG. 7 in which the tissue storage recess 12 is bent easily in the vertical direction at that portion, and therefore the tissue 100 with the needle shaft 10 protruding from the outer tube 20. 10 or when the outer tube 20 is strongly fed around the needle shaft 10 pierced into the tissue 100 as shown in FIG. 10, the needle shaft 10 is bent at the tissue storage recess 12 and cannot be used. May end up.
[0006]
Therefore, for example, as shown in FIG. 11, it is conceivable to increase the thickness of the needle shaft 10 in the tissue storage concave portion 12, but by doing so, the strength against bending is improved, but the tissue storage concave portion 12. The volume becomes small and a sufficient amount of sample tissue cannot be collected.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide an endoscopic tissue collecting tool that has an excellent bending strength at a needle housing recess portion and can collect a sufficient amount of sample tissue.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an endoscopic tissue sampling tool of the present invention includes a needle shaft having a needle tip formed forward and a tissue storage recess formed on a side surface in the vicinity of the needle tip. An endoscopic tissue collecting tool having a mantle tube having a blade formed at the tip of the needle shaft, which is fitted to the needle shaft so as to be movable back and forth in the axial direction and cut into the tissue storing recess. The recess is formed by recessing the needle shaft into a substantially C-shaped cross-sectional shape.
[0009]
In that case, the cross-sectional shape of the needle shaft in the tissue storage recess may be an arc shape of at least about a semicircle.
In addition, the cross-sectional shape of the needle shaft in the tissue storage recess may be formed in an arc shape with a gradually increasing angle from the front side to the back. In this case, the cross-sectional shape of the needle shaft in the tissue storage recess is the most rearward. What is necessary is just to be circular arc shape of at least about a semicircle in a part.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a distal end portion of a tissue collecting tool for an endoscope according to a reference example of the present invention. (A) shows a state in which the distal end of an outer tube 20 is pushed out to a predetermined distal end position. Shows a state in which the tip of the outer tube 20 is pulled back.
[0011]
A tip of a needle shaft 10 having a circular cross-sectional shape is formed with a non-pierced needle tip 11 pointed forward, and a tissue storage recess for storing tissue is provided immediately after the needle tip 11. 12 is formed in a shape in which the needle shaft 10 is recessed from the side surface.
[0012]
An outer tube 20 is fitted to the needle shaft 10 over substantially the entire length so as to be movable back and forth in the axial direction. The distal end portion of the outer tube 20 is formed in a tapered shape, and as a result, the inner circumferential front end portion of the outer tube 20 is an annular blade 21.
[0013]
Then, by moving the outer tube 20 forward and backward on the hand side, as shown in FIGS. 1A and 1B, the distal end portion of the outer tube 20 completely covers the tissue storage recess 12 and the tissue storage. The tissue that moves between the state retracted rearward from the recess 12 and enters the tissue storage recess 12 can be cut out by the blade 21.
[0014]
The cross-sectional shape of the cross section perpendicular to the axis of the needle shaft 10 in the tissue storage recess 12 is such that the half of the needle shaft 10 is completely cut away as shown in FIG. In the remaining half, an arc-shaped wall having a constant thickness along the outer peripheral surface is left, and is formed in a substantially C shape.
[0015]
In other words, the cross-sectional shape of the cross section perpendicular to the axis of the needle shaft 10 in the tissue storage recess 12 is formed in an arc shape having the original outer peripheral surface of the needle shaft 10 as an outer surface, and is at least about a semicircle or more. Any arc shape may be used.
[0016]
By forming the needle shaft 10 in such a cross-sectional shape in the tissue storage recess 12, excellent bending strength can be obtained without significantly reducing the volume of the tissue storage recess 12. As a result, the tissue storage recess 12 A sufficient amount of sample tissue can be collected without bending.
[0017]
Figure 3 shows the overall configuration of an endoscopic tissue collecting tool of the real施例of the present invention, the above-described reference example and tissue receiving recess 12 formed in the C-shaped cross section as well, IV As shown in FIG. 4 showing the -IV cross section and FIG. 5 showing the VV cross section, it is formed in an arc shape with a gradually increasing angle from the front side to the rear side. In this case, the cross-sectional shape of the tissue storage recess 12 may be an arc shape that is at least about a semicircle or more in the rearmost portion.
[0018]
When a force is applied to the needle tip 11 of the needle shaft 10, a larger bending force acts on the tissue storage recess 12 as it moves rearward, and thus the cross-sectional shape of the needle shaft 10 in the tissue storage recess 12 is rearward from the front side in this way. What is necessary is just to form in an arc shape with a large angle gradually, and the capacity | capacitance of the tissue storage recessed part 12 can be ensured to the maximum.
[0019]
In the endoscopic tissue sampling tool of this embodiment, the rear portion of the needle shaft 10 from the tissue storage recess 12 is formed in a pipe shape, and the inner hole portion leads from the proximal side to the tissue storage recess 12. It becomes road 13. Therefore, the specimen tissue can be cut with the blade 21 of the outer tube 20 after the specimen tissue is sucked into the tissue storage recess 12.
[0020]
Finger hooks 14 and 22 are respectively formed on the proximal side of the needle shaft 10 and the outer tube 20, and a base 16 for connecting a suction tool 50 communicates with the suction path 13 at the proximal end of the needle shaft 10. Is formed.
[0021]
In addition, a scale 15 for visually confirming the pushing amount of the outer tube 20 with respect to the needle shaft 10 is formed on the outer peripheral surface of the needle shaft 10, and for fixing the outer tube 20 to the needle shaft 10 at an arbitrary position. A manual fixing screw 23 is attached to the outer tube 20 side.
[0022]
【The invention's effect】
According to the present invention, since the tissue storage recess is formed by recessing the needle shaft into a substantially C-shaped cross section, the needle shaft has an excellent bending strength in the tissue storage recess, so that the needle can be used during use. The number of cases in which the shaft is bent and cannot be used is greatly reduced, and a sufficient amount of sample tissue can be collected in the tissue storage recess.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view of a distal end portion of a tissue collecting tool for an endoscope according to a reference example of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is a side sectional view showing an overall configuration of an endoscopic tissue collecting tool of the real施例of the present invention.
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a side cross-sectional view of a distal end portion of a conventional endoscope tissue collecting tool.
7 is a sectional view taken along line VII-VII in FIG.
FIG. 8 is a side cross-sectional view of a distal end portion in a use state of a conventional endoscope tissue sampling tool.
FIG. 9 is a side cross-sectional view of a distal end portion of a conventional endoscope tissue collecting tool in use.
FIG. 10 is a side cross-sectional view showing a state in which the needle shaft of a conventional endoscope tissue sampling tool is bent in a tissue storage recess.
FIG. 11 is a cross-sectional view showing an improved example of the cross-sectional shape of the needle shaft in the tissue storage recess.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Needle axis | shaft 11 Needle tip 12 Tissue storage recessed part 20 Outer tube 21 Blade

Claims (2)

A needle shaft having a needle tip formed forward and a tissue storage recess formed on the side surface of the vicinity of the needle tip, and a needle shaft that is fitted to the needle shaft so as to be movable back and forth in the axial direction. In a tissue collecting tool for an endoscope having a mantle tube having a blade for cutting off the tissue that is formed at the tip,
It said tissue receiving recess is formed by recessing the upper Kiharijiku substantially C-shaped cross section, the cross-sectional shape of the needle shaft in the tissue receiving recess is formed gradually angle larger arcuate rearward from the front side An endoscopic tissue collecting tool characterized by comprising: The tissue cross-sectional shape of the needle shaft in the housing recess, endoscopic tissue collecting device according to claim 1, wherein at least semi-circular about more arcuate in the most rearward portion.

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