JP5886454B1 - Biopsy needle - Google Patents

Abstract

A biopsy needle for collecting a cell tissue of a subject is surely capable of cutting the cell tissue, and the cut cell tissue is held and collected inside the biopsy needle. A biopsy needle is provided with a solid inner needle 2 and a hollow outer needle 3 into which the inner needle 2 is movably fitted, and a distal end portion 2h of the inner needle 2 is an outer needle 3. The tip 2q of the inner needle 2 is moved relative to the protruding posture of the inner needle 2 and the retracted posture of the inner needle 2 being retracted from the tip of the outer needle 3. The tip 2h of the inner needle 2 has a cell tissue of the subject. A through hole 2i is formed in which a cutting portion 2k for cutting the cut tissue and a holding portion 2m for holding the cut cell tissue are formed. The through hole 2i is formed when the inner needle tip 2h is in a protruding posture. Formed with a shape memory alloy that expands and deforms outward in the radial direction in response to body temperature, and is compressed by the outer needle 3 in a retracted position while being pressed by the outer needle 3 in a state of containing a cut cell tissue. Has been. [Selection] Figure 3

Description

  The present invention relates to a technical field of a biopsy needle for collecting a cellular tissue in a living body as a specimen mainly in the medical field.

  In general, in the medical field, a method of collecting a cellular tissue by puncturing a biopsy needle, which is a medical instrument, into the body of a subject when a cellular tissue collected from the body of the subject is examined as a specimen is known. . In such a biopsy needle, after the tip of the biopsy needle is punctured to the collection target area, a part of the cell tissue is cut by a cutting member provided at the tip, and the cut cell tissue is collected. Like to do.

As such biopsy needles, for example, the following are known.
The biopsy needle is provided with a solid inner needle and a hollow outer needle in which the inner needle is fitted so as to be movable in the axial direction, and a concave portion into which cellular tissue enters near the tip of the inner needle. It is assumed that a groove is formed while the tip of the outer needle is cut in an inclined shape, and the biopsy needle is punctured with the concave groove not protruding from the tip of the outer needle, and the tip of the biopsy needle is When the vicinity of the collection target area is reached, the inner needle is moved so that the concave groove protrudes from the tip of the outer needle, the cellular tissue to be collected enters the protruding concave groove, and then the outer needle is protruded vigorously. By cutting the cellular tissue that has entered the concave groove by covering the concave groove with the outer needle tip, the cut cellular tissue is sealed in the concave groove, and then the biopsy needle is removed from the body Some cell tissues are collected (for example, patent documents) Reference).

Further, the following are known.
The biopsy needle is a solid rod-shaped body, and a blade body protruding and projecting in the radial direction is provided on the side surface of the rod-shaped body, and a storage for storing the cell tissue cut by the blade body behind the blade body Provide a bag, puncture the rod-shaped body into the subject's body with the rod-shaped body immersed in the side surface of the rod-shaped body, and when the tip of the rod-shaped body reaches the collection target area, Projecting from the side of the rod-shaped body, cutting the cell tissue with the blade body by rotating the rod-shaped body in the direction around the axis, and storing the cell tissue cut by further rotating in the storage bag, In some cases, the tissue is collected by removing the biopsy needle from the body with the blade body again immersed in the side surface of the rod-like body (see Patent Document 2).

Japanese Patent Publication No. 6-28663 JP 2002-282254 A

  However, in Patent Document 1, it is not possible to confirm that the cell tissue of the region to be inspected has entered the groove, and even if the cell tissue has entered the groove, the cell is detected at the tip edge of the outer needle. When cutting the tissue, the cell tissue may escape from the groove, resulting in poor collection reliability. If the biopsy needle cannot be collected, the biopsy needle is punctured again to attempt the collection. However, such a second attempt not only has great physical and mental pain for the subject, but also the biopsy needle. The risk of infection with pathogenic bacteria increases due to the puncture site and cell tissue damage caused by puncturing the needle many times, which is not preferable for the subject. Furthermore, since reuse of a biopsy needle is not permitted for hygiene purposes, a new biopsy needle must be prepared when attempting to collect again, which is also a problem in terms of cost.

  Moreover, in the thing of the patent document 2, although a blade body is stored inside a rod-shaped body at the time of puncture and extraction, since it protrudes greatly from the side surface of a rod-shaped body at the time of cell tissue cutting | disconnection, it presses a structure | tissue, Since the tissue is cut as if it is wounded, not only the tissue is deformed but also the appearance is changed, which causes a physical and mental burden on the subject. In addition, since the storage bag in which the cell tissue is stored is to be extracted in a state of protruding from the side surface of the rod-shaped body, the stored cell tissue is subjected to pressure from the body tissue when the rod-shaped body is taken out, Not only is there any risk of deformation or alteration of the cellular tissue due to compression, but there is also a risk that the collected cell tissue will leak due to pressure and the collected tissue will leak into the healthy cellular tissue of the subject. If the cell tissue is a diseased tissue with metastasis such as cancer cells, there is a problem of promoting metastasis. In addition, there is a possibility that the entire storage bag will be removed from the biopsy needle and left in the patient's body due to compression. In such a case, an incision operation is performed immediately and the entire storage bag is removed. Therefore, the burden on the subject is further increased, and there is a problem that the present invention does not solve.

The present invention has been created in order to solve these problems in view of the above circumstances, and the invention of claim 1 is for puncturing the body of a subject to collect cellular tissue. A biopsy needle comprising a solid inner needle and a hollow outer needle in which the inner needle is movably fitted in the axial direction, the inner needle and the outer needle, When the inner needle is configured to move relative to the protruding posture in which the distal end of the inner needle protrudes from the distal end of the outer needle and the retracted posture in which the inner needle is retracted from the distal end of the outer needle, the inner needle rotates about the axis with respect to the outer needle. A cutting section configured to freely cut and cut the cell tissue of the subject by rotating the inner needle located in the protruding posture in the direction around the axis with respect to the outer needle at the distal end of the inner needle And a holding portion for holding the cut cell tissue, and the cutting portion and the holding portion protrude from the inner needle tip portion. When energized, the body temperature of the subject expands and deforms outward in the radial direction, and when in the retracted position, the outer needle is pressed and contracted and deformed radially inward while having a gap that can contain the cut cell tissue. The inner needle has a tip protruding portion that protrudes from the tip of the outer needle in the storage position, and the tip protruding portion is inclined so that the tip is sharper toward the tip. Consists of the needle tip of the needle, and the tip of the outer needle is formed in an inclined shape with the same inclination as the tip protrusion, and is inclined so as to be continuous with the tip protrusion of the inner needle when the inner needle is in the retracted position. The inner needle is formed with an engaging protrusion protruding in the outer diameter direction, and the outer needle has an engaging groove with which the engaging protrusion is engaged. The engagement groove is formed with a notch so as to penetrate the side surface. The first and second longitudinal grooves that are long in the axial direction to be moved between, the transverse groove that is long in the direction around the axis connecting the distal ends of the first and second longitudinal grooves, and formed from the lateral groove toward the base end side The biopsy needle is provided with a temporary fixing groove that can be engaged with an engaging projection so as to maintain the inner needle in a protruding posture .
In the invention of claim 2, a through hole penetrating in the radial direction is formed at the distal end portion of the inner needle, a hole edge of the through hole is a cut portion, and a gap between mutually opposed inner peripheral surfaces of the through hole is formed. The biopsy needle according to claim 1, wherein the biopsy needle is a holding portion.
According to a third aspect of the present invention, a long groove is formed in the distal end portion of the inner needle having a C-shaped radial cross section and long in the axial direction, the groove edge of the long groove is a cut portion, and the groove straddling portion is The biopsy needle according to claim 1, wherein the biopsy needle is a holding portion.

According to the invention of claim 1, the biopsy needle moves the inner tissue tip from the subject by relatively moving the tip of the inner needle into a protruding posture protruding from the tip of the outer needle and a storage posture recessed from the tip. The inner needle can be collected by cutting the cell tissue with the cutting part provided at the tip by rotating it around the axis with respect to the outer needle and holding it with the holding part. However, the cutting part and the holding part are expanded in a radial direction in response to the body temperature of the subject when in a protruding posture, and in a radial direction with a gap that can contain cellular tissue when in a storing posture. As a result of being formed of a shape memory alloy so as to shrink and deform, when the inner needle tip portion is in a projecting posture, the cutting portion and the holding portion are expanded and deformed in the radial direction and cut with a large cross-sectional area, Hold the cut tissue at the cutting position Therefore, the cell tissue is surely cut and held, and when the inner needle tip portion is in the storage position, the cutting portion and the holding portion are contracted and deformed in the radial direction so that the inner needle tip portion is cut. A void that encloses cellular tissue is formed. Thus, in the present invention, the cutting part is expanded and deformed outward in the radial direction of the biopsy needle to cut the cell tissue, and after cutting, the cutting part and the holding part for holding the cell tissue are contracted and deformed. Therefore, the cut cell tissue can be reliably collected.
Further, according to the invention of claim 2, since a through hole is formed in the distal end portion of the inner needle, and the cutting portion expands in the radial direction due to the expansion deformation of the through hole, the cell tissue is cut. The tissue can be cut reliably, and the tip of the inner needle contracts and deforms with the cut cell tissue held in the holding part, and it is stored in the outer needle. Held in the department.
Further, with the invention of claim 3, the distal end portion of the inner needle, since the radial cross section is long groove C shape is formed, cleaved cellular tissue cutting portion enters the securely held unit At the same time, the cellular tissue once entered does not go out.

It is a whole figure of the biopsy needle of this invention, Comprising: It is side surface sectional drawing which shows the accommodation attitude | position in which the inner needle was accommodated in the outer needle. It is a whole view of the biopsy needle of this invention, Comprising: It is side surface sectional drawing which shows the protrusion attitude | position which the front-end | tip part of the inner needle protruded from the front-end | tip of an outer needle. (A), (B) is a partial side sectional view showing a storage posture and a projection posture of an inner needle and an outer needle, respectively. These are the expanded views of an outer needle. (A), (B), (C) is a front sectional view showing the state of contraction deformation and expansion deformation of the tip of the inner needle, respectively, and a partial cross-sectional perspective view showing the state of expansion deformation. (A) is contraction deformation of the front-end | tip part of the inner needle in 2nd embodiment, (B), (C), (D) is front sectional drawing which each shows the mode of expansion deformation. (A), (B) is front sectional drawing which shows the contraction deformation | transformation and expansion deformation | transformation of the front-end | tip part of the inner needle in 3rd embodiment of this invention, respectively.

Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a biopsy needle for collecting a subject's cellular tissue. The biopsy needle 1 includes a solid inner needle 2 and an inner fitting in which the inner needle 2 is movable in the axial direction. And a hollow outer needle 3 that is configured.
The inner needle 2 has a large-diameter portion 2a on the proximal end side (on the operator's hand side) of the outer surface and a small-diameter portion 2b on the distal end side (needle tip side), and has a large-diameter portion 2a and a small-diameter portion 2b. In the meantime, a step-shaped inner needle step 2c is formed. The outer needle 3 has a large-diameter portion 3a on the base end side of the inner side surface and a small-diameter portion 3b on the distal end side. A step-shaped outer needle step portion 3c is provided between the large-diameter portion 3a and the small-diameter portion 3b. It is formed. And, between the inner needle stepped portion 2c and the outer needle stepped portion 3c, an elastic machine (using a coil spring in the present embodiment) 4 has a proximal end portion and a distal end portion respectively connected to the inner needle stepped portion 2c and It is wound in a stretchable manner in contact with the outer needle stepped portion 3c, and the inner needle 2 is always urged toward the proximal end side with respect to the outer needle 3 by the urging force of the bullet mechanics 4 It has become.

  The inner needle 2 is an extrusion support portion 2d whose proximal end is extended in a flange shape in the outer diameter direction, and the inner needle 2 is operated by pushing the extrusion support portion 2d toward the distal end. However, it moves to the tip side with respect to the outer needle 3 against the urging force of the bullet machine 4. At the distal end side of the push-out support portion 2d, a pair of turning operation portions 2e for turning the inner needle 2 with respect to the outer needle 3 in the direction around the axis is disposed radially outward. Then, after the pushing operation of the inner needle 2 is performed by the pushing support portion 2d, the inner needle 2 is turned to the outer needle by rotating the turning operation portion 2e while keeping the inner needle 2 being pushed. 3 is rotated relative to the axis.

  The large-diameter portion 2a of the inner needle 2 is formed with an engaging protrusion 2f that protrudes in the outer diameter direction. The engaging protrusion 2f is formed through the cylindrical side surface portion of the outer needle 3. The engaging groove 2e is movably engaged, and the engaging protrusion 2f is pivoted in an engaging groove 3e described later by the pushing operation by the pushing support portion 2d and the turning operation by the turning operation portion 2e. It moves in the center direction and the direction around the axis.

A through hole 2i that is long in the axial direction is formed in the distal end portion 2h of the inner needle 2 at the proximal end side with respect to the distal end 2g, and the through hole 2i is formed as a hole. A sharp cutting blade 2k is formed at the end edge of the through hole 2i, and the space between the mutually facing inner peripheral surfaces of the through-hole 2i is a gap for enclosing the cell tissue cut by the cutting blade 2k, The gap is formed as a holding portion 2m.
The inner needle 2 is formed of a shape memory alloy made of an alloy of nickel (Ni) and titanium (Ti), and the tip portion 2h having the through hole 2i is as shown in FIG. The through-hole 2i is retracted in the radial direction and can be immersed inside the outer needle 3, but when the body temperature of the subject is received, as shown in FIG. It is set to expand and deform in the radial direction.
3A, the inner needle 2 has a tip protruding portion 2n that protrudes from the tip 3r of the outer needle 3 when the inner needle 2 is in the retracted position. The portion 2n is inclined so as to be sharper toward the tip, and constitutes the needle tip of the inner needle 2.
In the embodiment of the present invention, the shape memory alloy is an alloy of nickel and titanium. However, as long as the material has a shape memory function without affecting the human body, it may be formed using other materials. Of course it is good.

A pair of grips 3d are formed to project radially outward from the side surface of the outer needle 3. When the operator punctures the subject with the biopsy needle 1, the grip 3d is held with both hands. After grasping and puncturing the tip 2g into the body of the subject, and storing the cellular tissue in the outer needle in the body of the subject, the biopsy needle 1 is pulled forward by grasping the handle 3d again. The biopsy needle 1 is extracted from the subject.

In the small diameter portion 3b of the outer needle 3, the above-mentioned engagement groove 3e is cut out so as to penetrate the cylinder side surface, and the engagement groove 3e is a first having substantially the same length in the axial direction. The longitudinal groove 3f and the second longitudinal groove 3g are formed at substantially opposite positions in the radial direction, and the distal end portion 3h of the first longitudinal groove 3f and the distal end portion 3i of the second longitudinal groove 3g are long in the circumferential direction. It is connected to both ends of 3j. Then, the distal end portion 2h of the inner needle 2 is moved from the proximal end portion 3k to the distal end portion 3h of the first longitudinal groove 3f against the urging force of the bullet machine 4 so that the distal end portion 2h of the inner needle 2 is moved to the outer needle 3 It moves from the storage posture stored in the inside to a protruding posture protruding from the distal end of the outer needle 3, and expands and deforms in the radial direction in response to the body temperature of the subject. Then, the distal end of the inner needle 2 is rotated by rotating the rotation operation portion 2e so as to move the engagement protrusion 2f from the distal end portion 3h of the first vertical groove 3f to the distal end portion 3i of the second vertical groove 3g. The portion 2h rotates approximately half a circumference of the inner needle 2 in the body of the subject, and the cutting blade 2k formed at the hole edge of the through hole 2i is rotated by the rotation to rotate the cell tissue of the subject. Is supposed to cut off. Thereafter, after the engaging projection 2f reaches the tip 3i of the second vertical groove 3g, when the operator releases his / her hand from the push-out support portion 2d and the rotation operation portion 2e, the engaging projection 2f is moved to the bullet 4 Is moved from the distal end 3i of the second longitudinal groove 3g to the proximal end 3m, and the distal end 2h is pressed against the distal end 3q of the outer needle 3 in a state where the cut cell tissue is held by the holding 2m. Thus, it is contracted and deformed in the radial direction to change from the protruding posture to the stowed posture.
In addition, a temporary fixing groove 3n for temporarily fixing the engaging projection 2f is formed at a position near the first vertical groove 3f of the horizontal groove 3j, and is cut out toward the base end side. The engaging protrusion 2f that has reached the distal end portion 3h is temporarily engaged with the temporary fixing groove 3n, and the distal end portion 2h in a protruding posture is brought into a stationary state in the body of the subject. It can be confirmed that 2h has been expanded and deformed.

In addition, the distal end portion 3q of the outer needle 3 is formed in an inclined shape with the same inclination as the distal end protruding portion 2n of the inner needle 2, and the distal end portion of the biopsy needle 1 is in the retracted position of the inner needle 2. The tip of the biopsy needle 1 is formed with a continuous inclination by the distal end protruding portion 2n of the inner needle and the distal end portion 3q of the outer needle, so that the subject can be easily punctured in the retracted position. .

In the embodiment of the present invention constructed as narrative, the biopsy needle 1 when piercing the body of the subject, the biopsy needle 1, the tip portion 2h of the inner needle 2 in the distal end portion 3q of the outer needle 3 While holding the handle 3d of the biopsy needle 1 with both hands in the retracted storage posture state, the biopsy needle 1 is punctured so that the distal end 2g of the biopsy needle 1 reaches the sampling region. Generally, it is performed while confirming the position of the biopsy needle 1 in the body of the subject by an ultrasonic image or the like.
When it is confirmed by ultrasonic images or the like that the distal end 2g has reached the collection region, the pushing operation for puncturing is stopped, and the outer needle 3 is maintained while maintaining the posture of the outer needle 3 while holding the handle 3d. extruding the support portion 2d is pushed in and is Hensugata the projecting posture tip 2h of the inner needle 2 in the body of the subject is projected from the tip 3 r of the outer needle 3 against. At this time, the engaging protrusion 2f moves from the base end 3k of the first longitudinal groove 3f to the tip 3h by the pushing of the push-out support part 2d. However, when the engaging protrusion 2f contacts the tip 3h, the push-out is pushed out. While maintaining the pushing-out state of the support portion 2d, the rotation operation portion 2e is grasped and rotated slightly around the axis (counterclockwise in the present embodiment), and the engagement protrusion 2f is inserted into the temporary fixing groove 3n. Engage.

  In this state where the engagement protrusion 2f is engaged with the temporary fixing groove 3n, the distal end portion 2h of the inner needle 2 is stationary in a state of protruding in the body of the subject, and the body temperature of the subject is increased. In response, it expands and deforms in the radial direction. After confirming the state in which the inner needle tip portion 2h is expanded and deformed by an image or the like, the push-out support portion 2d is pushed again to remove the engaging protrusion 2f from the temporary fixing groove 3n, and then the rotation operation portion 2e is again pushed. By gripping and rotating the inner needle 2 in the direction around the axis (counterclockwise in the present embodiment), the engagement protrusion 2f is moved from the position where the temporary fixing groove 3n of the lateral groove 3n is formed to the tip of the second vertical groove 3g. The cutting blade 2k formed in the through hole 2i expanded and deformed by this rotation is moved to the portion 3i and cuts the cell tissue in the body of the subject, and the cut cell tissue is held in the holding portion 2m. Let Then, after the engaging protrusion 2f reaches the second longitudinal groove tip 3i, the engaging protrusion 2f of the elastic machine 4 is released by slowly releasing the hand from the pushing support part 2d and the rotating operation part 2e. In response to the urging force, the second longitudinal groove 3g moves from the distal end portion 3i to the proximal end portion 3m, whereby the distal end portion 2h of the inner needle 2 is retracted and retracted into the inner side of the outer needle 3 for storage. Become posture. Thus, in the process in which the inner needle distal end portion 2h is transformed from the protruding posture to the retracted posture, the cell tissue cut by the cutting blade 2k and held by the holding portion 2m is in a state of being held by the holding portion 2m. Since it is housed in the outer needle 3 together with the through hole 2i, the cut cell tissue is housed inside the outer needle 3 without detaching from the inside of the through hole 2i.

  Thus, since the inner needle 2 is formed using a shape memory alloy, and the through hole 2i receives the body temperature of the subject and expands and deforms in the radial direction, the cellular tissue of the subject becomes the through hole 2i. Since it is easy to enter and the cell tissue that has entered is cut by rotating the inner needle 2, the cell tissue is reliably collected, and the collected cell tissue is removed from the tip 2h of the inner needle. When the needle 3 is immersed, the through-hole 2i is contracted and deformed in the radial direction in a state where there is a space that can contain the cell tissue, and the cell tissue can be taken out.

  In the embodiment of the present invention, the shape of the through-hole is configured as a long hole that expands into an elliptical shape. However, the present invention is not limited to this, and the through-hole 5 in the storage posture is shown in FIG. As in the second embodiment shown in FIG. 2), those having a C-shaped radial cross section may be formed in an arcuate state facing each other. By forming in this way, the holding portion 5a in the storage posture is such that the cutting blades 5b formed on the hole edge face each other at close positions. Since it is held by the holding portion 5a so as to be contained inside 5i, it is held more securely. Moreover, as shown in FIG. 6 (B), the widening posture of the through-hole 5i formed in this way is such that all the cutting blades 5b formed at the hole edge are expanded and deformed outward in the radial direction. Further, as shown in FIG. 6 (C), only one cutting blade 5b may be configured to expand and deform outward in the radial direction. As shown in FIG. 5B, only the cutting blades facing each other on the radial diagonal line of the inner needle among the cutting blades 5b may be configured to expand and deform. As described above, the cutting blade can be formed by changing the shape of the cutting blade at the time of the expanding deformation of the cutting blade 5b to a different one, so that an optimum shape can be selected and formed as appropriate.

  Further, as in the third embodiment shown in FIG. 7, instead of the through hole formed in the inner needle tip, the radial cross section is C-shaped and extends long in the axial direction of the inner needle. The long groove 6 may be a long groove 6, and in the retracted position, as shown in FIG. 7A, the long groove 6 is formed with a holding portion 6 a in which the edge portions are close to or in contact with each other. As shown in FIG. 7B, the cutting blades 6b, which are the edge portions, may be expanded so that the cutting blades 6b protrude in the outer diameter direction. When the inner needle tip 2h is configured in this way, the cell tissue cut by the cutting part 6b surely enters the holding part 6a formed in the long groove 6 and the cells once entered the holding part 6a. It is possible to reliably hold the cell tissue without causing the tissue to go out.

  INDUSTRIAL APPLICABILITY The present invention can be used in the technical field of biopsy needles that are mainly used in the medical field for collecting cellular tissue in a living body as a specimen.

1 Biopsy Needle 2 Inner Needle 2h Tip 3 Outer Needle 2k Cutting Blade 2m Holding Part

Claims (3)

A biopsy needle for puncturing into a body of a subject to collect a cellular tissue, the biopsy needle having a solid inner needle and a hollow shape in which the inner needle is movably fitted in the axial direction The inner needle and the outer needle are configured to move relative to each other between a protruding posture in which the tip of the inner needle protrudes from the tip of the outer needle and a retracted posture in which the tip of the outer needle is retracted. The inner needle is configured to be rotatable about the axis relative to the outer needle, and the inner needle positioned in the protruding posture is rotated about the axis relative to the outer needle at the distal end portion of the inner needle. A cutting part that cuts the cell tissue of the subject by being moved and a holding part that holds the cut cell tissue are formed, and the tip part of the inner needle protrudes from the cutting part and the holding part When in the posture, it receives the body temperature of the subject and expands and deforms outward in the radial direction. When in the stowed posture, it can contain the cut cell tissue Is formed of a shape memory alloy so as to pressed contracted radially inward deformation to the outer needle in a state having said inner needle has a distal protrusion protruding from the tip of the outer needle in the retracted position, the The tip protrusion is inclined so as to be sharper toward the tip and constitutes the needle tip of the inner needle, and the tip of the outer needle is formed in an inclined shape with the same inclination as the tip protrusion, and the inner needle When the needle is in the stowed position, it is inclined so as to be continuous with the tip protruding portion of the inner needle to constitute the needle tip of the biopsy needle, and the inner needle is formed with an engaging projection that protrudes in the outer diameter direction. The needle is formed with a notch so that the engaging groove with which the engaging protrusion engages penetrates the side surface, and the engaging groove moves the inner needle between the retracted position and the protruding position. First and second longitudinal grooves that are long in the axial direction, and lateral grooves that are long in the direction around the axis connecting the tips of the first and second longitudinal grooves. Biopsy needle, wherein the engagement projection is configured with a temporary fixing groove engageable to maintain the inner needle is formed toward the base end side from the transverse groove in the projecting position.   A through-hole penetrating in the radial direction is formed at the distal end portion of the inner needle, a hole edge of the through-hole is a cutting portion, and a space between inner peripheral surfaces of the through-holes facing each other is a holding portion. The biopsy needle according to claim 1. A long groove in the axial direction is formed at the distal end portion of the inner needle with a C-shaped radial cross section, the groove edge of the long groove is a cut portion, and the groove straddling portion is a holding portion. The biopsy needle according to claim 1.

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