JP4554750B2 - Endoscopy tissue collection tool - Google Patents

Endoscopy tissue collection tool Download PDF

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Publication number
JP4554750B2
JP4554750B2 JP2000036165A JP2000036165A JP4554750B2 JP 4554750 B2 JP4554750 B2 JP 4554750B2 JP 2000036165 A JP2000036165 A JP 2000036165A JP 2000036165 A JP2000036165 A JP 2000036165A JP 4554750 B2 JP4554750 B2 JP 4554750B2
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JP
Japan
Prior art keywords
tissue
needle shaft
cross
needle
storage recess
Prior art date
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Expired - Fee Related
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JP2000036165A
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Japanese (ja)
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JP2001224598A (en
Inventor
輝雄 大内
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Hoya Corp
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Hoya Corp
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Description

【0001】
【発明の属する技術分野】
この発明は、内視鏡の処置具挿通チャンネルに挿脱されて肝生検等を行うのに用いられる内視鏡用組織採取具に関する。
【0002】
【従来の技術】
図6は、従来の内視鏡用組織採取具として用いられているいわゆるメンギーニ組織採取針の先端部分を示しており、棒状の針軸10の先端には尖った針先11が形成されると共に、切り取った標本組織を収納するための組織収納凹部12が、針先11の近傍を側面から窪ませた形状に形成されている。図7は、組織収納凹部12における針軸10の、軸線に対して垂直な断面の断面図である。
【0003】
針軸10に軸線方向に進退自在に被嵌された外套管20の先端には、組織収納凹部12に入り込んだ組織を切り取るための環状の刃21が内周側に形成されている。
【0004】
図8と図9は、そのような従来の内視鏡用組織採取具を用いて生検組織を採取している状態を示しており、図8に示されるように、組織100に突き刺した外套管20を少し引き戻して組織収納凹部12内に組織100の目標部分を入れ込み、次いで図9に示されるように、外套管20を瞬時に送り出して、組織収納凹部12内に入り込んでいる組織100から標本組織101を切り取るようになっている。
【0005】
【発明が解決しようとする課題】
しかし、組織収納凹部12部分が図7に示されるような断面形状の針軸10は、その部分で上下方向に簡単に曲がってしまうので、針軸10を外套管20から突出した状態で組織100に突き刺す際や、組織100に突き刺された針軸10を軸にして外套管20を強く送り出す際に、図10に示されるように、針軸10が組織収納凹部12部分で折れ曲がって使用できなくなってしまう場合がある。
【0006】
そこで、例えば図11に示されるように、組織収納凹部12部分の針軸10の肉厚を厚くすることが考えられるが、そのようにすると、曲げに対する強度は向上するが、組織収納凹部12の容量が小さくなって十分な量の標本組織を採取することができない。
【0007】
そこで本発明は、組織収納凹部部分において針軸が優れた曲げ強度を有し、しかも十分な量の標本組織を採取することができる内視鏡用組織採取具を提供することを目的とする。
【0008】
【課題を解決するための手段】
上記の目的を達成するため、本発明の内視鏡用組織採取具は、前方に向けて針先が形成されると共にその針先の近傍部分の側面に組織収納凹部が形成された針軸と、上記針軸に軸線方向に進退自在に被嵌されて上記組織収納凹部に入り込んだ組織を切り取るための刃が先端に形成された外套管とを有する内視鏡用組織採取具において、組織収納凹部が、針軸を略C字状の断面形状に窪ませて形成されているものである。
【0009】
その場合、組織収納凹部における針軸の断面形状が、少なくとも半円程度以上の円弧状であればよい。
また、組織収納凹部における針軸の断面形状が、先側から後方へ次第に角度の大きな円弧状に形成されていてもよく、その場合には、組織収納凹部における針軸の断面形状が、最も後方部分において少なくとも半円程度以上の円弧状であればよい。
【0010】
【発明の実施の形態】
図面を参照して本発明の実施例等について説明する。
図1は、本発明の参考例の内視鏡用組織採取具の先端部分を示しており、(A)は外套管20の先端が所定の先端位置まで押し出された状態を示し、(B)は、外套管20の先端が後方に引き戻された状態を示している。
【0011】
断面形状が円形の針軸10の先端には、前方に向けて尖った無孔の針先11が形成されており、針先11の直後の部分には、組織を収納するための組織収納凹部12が、針軸10を側面から窪ませた形状に形成されている。
【0012】
針軸10には、外套管20が軸線方向に進退自在に略全長にわたって被嵌されている。外套管20の先端部分は先細りのテーパ状に形成されており、その結果、外套管20の内周先端部分が環状の刃21になっている。
【0013】
そして、外套管20を手元側で進退操作することにより、図1の(A)、(B)に示されるように、外套管20の先端部分が組織収納凹部12を完全に覆う状態と組織収納凹部12より後方に退避した状態との間を移動し、組織収納凹部12に入り込んだ組織を刃21によって切り取ることができる。
【0014】
組織収納凹部12における針軸10の、軸線に対して垂直な断面の断面形状は、II−II断面を図示する図2に示されるように、針軸10の半部が完全に切り欠かれ、残りの半部には外周面に沿う一定の厚さの円弧状の壁が残されて、略C字状に形成されている。
【0015】
言い換えると、組織収納凹部12における針軸10の、軸線に対して垂直な断面の断面形状は、針軸10の元々の外周面を外面とする円弧状に形成されており、少なくとも半円程度以上の円弧状であればよい。
【0016】
組織収納凹部12において針軸10をこのような断面形状に形成することにより、組織収納凹部12の容積をさほど減少させることなく優れた曲げ強度を得ることができ、その結果、組織収納凹部12が折り曲がることなく十分な量の標本組織を採取することができる。
【0017】
図3は、本発明の実施例の内視鏡用組織採取具の全体構成を示しており、前述の参考例と同様にC字状の断面形状に形成された組織収納凹部12が、IV−IV断面を図示する図4及びV−V断面を図示する図5にも示されるように、先側から後方へ次第に角度の大きな円弧状に形成されている。この場合、組織収納凹部12の断面形状が、最も後方部分において少なくとも半円程度以上の円弧状であればよい。
【0018】
針軸10の針先11に力が加わると、組織収納凹部12には後方へいくほど大きな曲げ力が作用するので、組織収納凹部12における針軸10の断面形状をこのように先側から後方へ次第に角度の大きな円弧状に形成すればよく、組織収納凹部12の容量を最大限に確保することができる。
【0019】
なお、この実施例の内視鏡用組織採取具では、針軸10の組織収納凹部12より後方部分がパイプ状に形成されていて、その内孔部分が手元側から組織収納凹部12に通じる吸引路13になっている。したがって、標本組織を組織収納凹部12内に吸い付けた状態にしてから外套管20の刃21で切断することができる。
【0020】
針軸10と外套管20の手元側には、各々指掛け14,22が形成され、針軸10の手元側端部には、吸引具50を接続するための口金16が吸引路13に連通して形成されている。
【0021】
また、針軸10に対する外套管20の押し込み量を目視するための目盛り15が針軸10の外周面に形成されており、針軸10に対して外套管20を任意の位置で固定するための手動固定ネジ23が外套管20側に取り付けられている。
【0022】
【発明の効果】
本発明によれば、組織収納凹部が、針軸を略C字状の断面形状に窪ませて形成されていることにより、組織収納凹部において針軸が優れた曲げ強度を有するので、使用時に針軸が折れ曲がって使用できなくなってしまうようなケースが大幅に減少し、しかも十分な量の標本組織を組織収納凹部内に採取することができる。
【図面の簡単な説明】
【図1】 本発明の参考例の内視鏡用組織採取具の先端部分の側面断面図である。
【図2】図1におけるII−II断面図である。
【図3】 本発明の実施例の内視鏡用組織採取具の全体構成を示す側面断面図である。
【図4】図3におけるIV−IV断面図である。
【図5】図3におけるV−V断面図である。
【図6】従来の内視鏡用組織採取具の先端部分の側面断面図である。
【図7】図6におけるVII−VII断面図である。
【図8】従来の内視鏡用組織採取具の使用状態における先端部分の側面断面図である。
【図9】従来の内視鏡用組織採取具の使用状態における先端部分の側面断面図である。
【図10】従来の内視鏡用組織採取具の針軸が組織収納凹部で曲がってしまった状態を示す側面断面図である。
【図11】組織収納凹部における針軸の断面形状の改良例を示す断面図である。
【符号の説明】
10 針軸
11 針先
12 組織収納凹部
20 外套管
21 刃
[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)

前方に向けて針先が形成されると共にその針先の近傍部分の側面に組織収納凹部が形成された針軸と、上記針軸に軸線方向に進退自在に被嵌されて上記組織収納凹部に入り込んだ組織を切り取るための刃が先端に形成された外套管とを有する内視鏡用組織採取具において、
上記組織収納凹部が上記針軸を略C字状の断面形状に窪ませて形成され、上記組織収納凹部における上記針軸の断面形状が先側から後方へ次第に角度の大きな円弧状に形成されていることを特徴とする内視鏡用組織採取具。
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:
上記組織収納凹部における上記針軸の断面形状が、最も後方部分において少なくとも半円程度以上の円弧状である請求項記載の内視鏡用組織採取具。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.
JP2000036165A 2000-02-15 2000-02-15 Endoscopy tissue collection tool Expired - Fee Related JP4554750B2 (en)

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KR101481732B1 (en) 2013-04-17 2015-01-12 전북대학교산학협력단 needle for inspecting the tissue of body

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09504979A (en) * 1994-03-14 1997-05-20 ジョン アール ハーガ, Improved incision tip for biopsy needle
JPH10507952A (en) * 1994-10-31 1998-08-04 ボストン・サイエンティフィック・コーポレーション Biopsy needle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09504979A (en) * 1994-03-14 1997-05-20 ジョン アール ハーガ, Improved incision tip for biopsy needle
JPH10507952A (en) * 1994-10-31 1998-08-04 ボストン・サイエンティフィック・コーポレーション Biopsy needle

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