JP5789692B1 - Biopsy device that can be charged with relatively little force - Google Patents

Abstract

A biopsy device that can be easily charged even by a weak person is provided. A biopsy needle composed of an inner needle and an outer needle that slide relative to each other is held, and the inner needle and the outer needle are each locked at a “charge position” and released to the “projection position”. In the biopsy device to be fired, the inner needle charging operation unit 30 for charging the inner needle is provided with a slide gear rack extending in the sliding direction, and the casing 11 also has a fixed gear extending in the sliding direction. A rack is provided. The inner needle slider 20 rotatably holds a pinion gear 302 that engages with both the slide gear rack and the fixed gear rack. As a result, when the inner needle charging operation unit 30 is slid, the pinion gear 302 is While rotating, it slides in the same direction, so the inner needle slider 20 also slides in the same direction. A similar mechanism may be provided in the outer needle charge operation unit 70. [Selection] Figure 1

Description

  The present invention relates to a biopsy device that holds a biopsy needle so that it can be fired.

For the purpose of medical check and the like, a biopsy needle for collecting a part of a body tissue such as a liver and a kidney has been conventionally known (Patent Document 1). The biopsy needle includes a cylindrical outer needle and an inner needle that slides relative to the inside of the outer needle.
Such a biopsy needle is held in the biopsy device so that it can be fired. That is, the outer needle and the inner needle are held in such a manner that they can be fired from the “charge position” where the elastic energy is stored toward the “projection position” where the elastic energy is released.

  In use, it is necessary to move the outer and inner needles from the “projection position” to the “charge position” against the elastic force of the spring member, and to lock to that position. The user operates the operation member provided in the above. The force required at that time is generally 40 to 45 N (about 4.1 to 4.6 Kgf), and it is not easy for a weak person such as a woman or when one-handed operation is performed.

In order to solve such a problem, the present applicant has already developed and patented a biopsy device in which the outer needle and the inner needle can be easily locked in the “charge position” with one hand before firing ( Patent Document 2).
However, this biopsy device uses a link mechanism and has a slightly complicated structure. Therefore, there is a problem that the number of parts is large and the manufacturing cost is high.

Japanese Patent Publication No. 6-28663 Patent No. 5001987

  The present invention was devised in view of the current state of the prior art, and its purpose is a relatively simple configuration that does not use a link mechanism, and even a powerless person can easily perform a charging operation. It is to provide a biopsy device that is possible.

Means for Solving the Problems and Effects of the Invention

The biopsy device of the present invention holds a biopsy needle composed of an inner needle and an outer needle that slide relative to each other, locks the inner needle and the outer needle at the “charge position”, and releases the lock. It is a biopsy device that is fired to the “projection position”. And the biopsy device
A casing,
An inner needle slider that holds the inner needle and is slidable between the “charge position” and the “protruding position” in the casing, and is biased toward the “protruding position” by the inner needle spring. When,
An inner needle charging operation section that slides the inner needle slider to the “charge position” against the urging force of the inner needle spring;
The outer needle slider that holds the outer needle and is slidable between the “charge position” and the “protruding position” in the casing, and is biased toward the “protruding position” by the outer needle spring. When,
An outer needle charging operation section that slides the outer needle slider to the “charge position” against the urging force of the outer needle spring.
Furthermore, the biopsy device includes any one or both of the following (A) and (B).

(A)
The inner needle charging operation portion is provided with a slide gear rack extending in the sliding direction, while the casing is also provided with a fixed gear rack extending in the sliding direction,
The inner needle slider rotatably holds the pinion gear that engages with both the slide gear rack and the fixed gear rack. As a result, when the inner needle charge operation portion is slid, the pinion gear rotates while the pinion gear rotates. The inner needle slider slides in the same direction.

(B)
The outer needle charge operation portion is provided with a slide gear rack extending in the sliding direction, while the casing is also provided with a fixed gear rack extending in the sliding direction.
The outer needle slider rotatably holds the pinion gear that engages with both the slide gear rack and the fixed gear rack. As a result, when the outer needle charging operation portion is slid, the pinion gear rotates while rotating. The outer needle slider slides in the same direction.

In the above description, the “slide gear rack” means a gear rack that slides itself. Further, the “fixed gear rack” means a gear rack that does not move itself but is fixed.

  In other words, in the biopsy device of the present invention, the “slide gear rack”, “fixed gear rack”, and both gear racks are engaged with respect to one or both of the inner needle charge operation portion and the outer needle charge operation portion. By transmitting the force through the “pinion gear”, the force required to pull the inner needle slider (or outer needle slider) can be reduced to “½”. This is the same principle as “when a moving pulley is used to lift an object, a force that is half the mass of the object is sufficient” (however, the distance to pull the operation unit is the actual amount of movement of the needle). 2 times required).

  Therefore, even if it is a weak person or a one-handed operation, it is possible to perform the charging operation relatively easily. In addition, since the link mechanism is not used, the device configuration can be made relatively simple, which is advantageous in terms of reducing the number of parts and reducing costs.

In the biopsy device of the present invention, the inner needle charging operation portion is urged by a spring in a direction toward the “projecting position” (that is, a direction returning to the initial position of the inner needle charging operation portion), and the inner needle slider is moved. Even if a configuration is adopted in which the “slider body holding the inner needle” and the “sliding member capable of sliding relative to the slider body” are configured such that the “sliding member” rotatably holds the pinion gear. Good. The slider body is provided with a stopper that stops the relative slide by contacting the slide member.
If such a configuration is adopted, the inner needle charge operation unit is operated to move the inner needle slider to the “charge position” and lock, and then the inner needle charge operation unit is released (the finger to be operated is released). And the slider body (that is, the inner needle) remains locked in the “charge position”, while the slide member is pulled back by the spring together with the inner needle charge operating portion. That is, the inner needle charge operation unit can return to the original position (initial position).

In the case of adopting such a configuration, when the lock is released and the inner needle is fired after the charging operation, the inner needle charging operation unit has already returned to the initial position. That is, when the inner needle is fired, the inner needle charging operation part exposed to the outside of the apparatus does not move. As a result, the operability of the biopsy device can be improved (if the inner needle charging operation part exposed to the outside of the apparatus moves, the inner needle is fired by hitting the hand holding the apparatus, etc. May be hindered).
A similar configuration can be adopted for the outer needle slider.

The perspective view of the biopsy apparatus which concerns on one Embodiment of this invention. The figure explaining the principle of a biopsy needle. FIG. 2 is an exploded view of the biopsy device of FIG. 1. The figure explaining the mechanism in which the slider 20 for inner needles slides. The figure explaining the mechanism in which the slider 60 for outer needles slides. The figure explaining the biopsy apparatus which concerns on a modification. The figure explaining the merit of the modification of FIG. The figure explaining the example which provided the protrusion member engaged with an outer needle charge operation part in the inner needle charge operation part. The schematic diagram explaining the principle in which the force required to pull an inner needle charge operation part becomes small in this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a biopsy device 10 according to an embodiment of the present invention, and also shows the opposite surface of the device main body. The biopsy device 10 holds the biopsy needle so that it can be fired. The biopsy needle includes an inner needle 21 and an outer needle 61 that slide relative to each other, as will be described later with reference to FIG.
The outer diameter of the biopsy needle (the outer diameter of the outer needle 61) is about 1.5 mm, and the biopsy device 10 is large enough to be held with one hand. Although details will be described later, first, an outline of the biopsy device 10 will be described.

<< Outline of Biopsy Device 10 >>
An inner needle slider 20 that holds the inner needle 21 and an outer needle slider 60 that holds the outer needle 61 are slidably held in the casing 11. The inner needle slider 20 and the outer needle slider 60 are slidable between the “charge position” and the “projection position” in the casing 11, respectively.
The inner needle slider 20 holds a pinion gear 302 in a rotatable manner, and the pinion gear 302 is exposed to the outside of the apparatus. The inner needle slider 20 is urged toward the “protruding position” by the inner needle spring 22, but the inner needle charging operation portion 30 provided on the back surface side in FIG. 1 is pulled to the right side in FIG. By driving 302, the inner needle slider 20 can be slid to the “charge position”. The inner needle slider 20 is locked at the “charge position” by the lock mechanism.
Similarly, the outer needle slider 60 holds a pinion gear 702 rotatably, and the pinion gear 702 is exposed to the outside of the apparatus. The outer needle slider 60 is urged toward the “projection position” by the outer needle spring 62, but the outer needle charging operation unit 70 is pulled to the right side in the drawing to drive the pinion gear 702, thereby The needle slider 60 can be slid to the “charge position”. The outer needle slider 60 is locked at the “charge position” by the lock mechanism.
After charging, the operation mechanism 1 is slid backward (arrow A in FIG. 1) to release the lock mechanism, and the biopsy needle is fired from the “charge position” to the “projection position” (strictly speaking, The inner needle 20 is fired first, and the outer needle 61 is fired later).

<Configuration of biopsy needle>
Next, the principle of the biopsy needle will be briefly described with reference to FIG. 2 (this principle itself is generally known). The biopsy needle includes an inner needle 21 and an outer needle 61 that slide relative to each other. The outer needle 61 has a cylindrical shape, and the front end (and the rear end) is open. The inner needle 21 has a sharp tip, and a recess 21a is provided at a position slightly rearward of the tip.
When the operation member 1 of the biopsy device 100 is slid backward from the state where the inner needle 21 and the outer needle 61 are locked at the “charge position” (arrow A in FIG. 1), the biopsy needle is fired. (Arrow B in FIG. 2). Specifically, first, the inner needle 21 is fired and pierces the organ. At this time, a part of the organ rests on the recess 21a. Thereafter, the outer needle 61 is fired with a slight delay (just momentarily) to cover the recess 21a. A cutting edge 61a is formed at the distal end of the outer needle 61, and the tissue placed in the recess 21a can be cut out from the organ. Thereafter, the tissue is taken out of the body together with the biopsy needle.

<< Internal structure of biopsy device 10 >>
Next, the internal structure of the biopsy device 10 will be described in detail. FIG. 3 is an exploded view of the biopsy device 10. The casing 11 is composed of two upper and lower pieces, that is, a casing upper piece 11a and a casing lower piece 11b, and the inner needle slider 20 and the outer needle slider 60 are held between them. In FIG. 3, the casing upper piece 11a shows the outer surface side, and the casing lower piece 11b shows the inner surface side.

As shown by the arrow C in FIG. 3B, the inner needle 21 is inserted into the cylindrical outer needle 61 and the sliders 20 and 60 are combined, and these are connected to the upper and lower casing pieces 11a and 11b. Incorporate between.

<< Mechanism of Slider 20 for Inner Needle >>
FIG. 4 shows a state in which only the inner needle slider 20 is placed on the casing lower piece 11b. A mechanism for sliding the inner needle slider 20 in the casing 11 will be described with reference to FIG.

  The inner needle slider 20 is slidably inserted on the shaft 31, and the inner needle spring 22 is inserted on the shaft 31.

The inner needle slider 20 holds the inner needle 21 on the inner needle fixing portion 25 and slides integrally with the inner needle 21. When the inner needle slider 20 is in the position shown in FIG. 4A, the inner needle 21 is in the most protruding state. Therefore, in this specification, this position is referred to as “projecting” with respect to the inner needle 21 and the inner needle slider 20. Called “position”. The inner needle slider 20 is urged toward the “protruding position” by the inner needle spring 22, but when the pinion gear 302 is driven by pulling the inner needle charging operation section 30, the urging force of the spring 22 is driven. The inner needle slider 20 can be slid to the position shown in FIG. In this specification, this position is called a “charge position”.
FIG. 4B shows an intermediate position.

  In the “charge position” of FIG. 4C, the inner needle 21 is in the most retracted state, and the spring 22 is in a charged state. Further, an elastic engagement portion 26 formed on the rear side of the inner needle fixing portion 25 engages with a locking hole 18 provided at the rear end of the casing to lock the inner needle slider 20 at the “charge position”. ing.

The inner needle slider 20 holds the pinion gear 302 rotatably. As described above, the pinion gear 302 is exposed to the outside in the assembly state of the apparatus, and is driven by the inner needle charging operation unit 30, whereby the inner needle slider 20 is carried to the “charge position”.

<< Mechanism for sliding the outer needle slider 60 >>
FIG. 5 shows a state in which only the outer needle slider 60 is placed on the casing lower piece 11b. A mechanism for sliding the outer needle slider 60 in the casing 11 will be described with reference to FIG.

  The outer needle slider 60 is slidably inserted on the shaft 71, and the outer needle spring 62 is inserted on the shaft 71.

The outer needle slider 60 holds the outer needle 61 in the outer needle fixing portion 65 and slides integrally with the outer needle 61. When the outer needle slider 60 is at the position shown in FIG. 5A, the outer needle 61 is in the most protruding state. Called “position”. The outer needle slider 60 is urged toward the “projection position” by the outer needle spring 62, but the urging force of the spring 62 is driven by pulling the outer needle charging operation unit 70 and driving the pinion gear 702. The outer needle slider 60 can be slid to the position shown in FIG. In this specification, this position is called a “charge position”.
FIG. 5B shows an intermediate position.

  In the “charge position” of FIG. 5C, the outer needle 61 is in the most retracted state, and the spring 62 is in a charged state. In addition, an elastic engagement portion 66 formed on the rear side of the outer needle fixing portion 65 engages with a locking hole 19 provided on the inner surface of the casing to lock the outer needle slider 60 at the “charge position”. Yes.

The outer needle slider 60 holds the pinion gear 702 rotatably. As described above, the pinion gear 702 is exposed to the outside in the assembly state of the apparatus, and is driven by the outer needle charge operation unit 70, whereby the outer needle slider 60 is carried to the “charge position”.

<< A device for reducing the force required to pull the charge operation units 30 and 70 >>
In the present invention, special measures are taken in order to reduce the force required to pull the inner needle charge operation unit 30 (or the outer needle charge operation unit 70) during charging. Hereinafter, this device will be described in relation to the inner needle charge operation unit 30, but the same applies to the outer needle charge operation unit 70.

As shown in FIG. 3A, first, the inner needle charge operation unit 30 is integrally formed with a slide gear rack 301 extending in the sliding direction. “Sliding gear rack” means a gear rack that itself slides.
On the other hand, the casing 11 (specifically, the casing upper piece 11a) is also integrally formed with a fixed gear rack 303 extending in the same sliding direction. “Fixed gear rack” means a gear rack that itself is fixed without moving.

The inner needle slider 20 rotatably holds the pinion gear 302 that engages with both the gear racks 301 and 303. What is necessary is just to employ | adopt the generally well-known thing suitably as a concrete holding | maintenance aspect. The important point is that the pinion gear 302 and the inner needle slider 20 are integrated, and if the pinion gear 302 slides, the inner needle slider 20 (and the inner needle 21) also move together.
That is, when the inner needle charging operation unit 30 is slid, the pinion gear 302 is rotated in the same direction while rotating, and therefore the inner needle slider 20 is also slid in the same direction, and the inner needle 21 is pulled into the “charge position”. It is.

As a result of such a configuration, the force required to slide the inner needle slider 20 against the urging force of the inner needle spring 22 can be reduced. That is, if the force required to slide the inner needle charging operation unit 30 directly connected to the inner needle slider 20 without using the gear rack and pinion gear as described above is “M”, the gear rack And by interposing the pinion gear, the required force can be halved (M / 2).
However, the distance to pull the inner needle charging operation unit 30 is required to be twice the actual movement amount of the inner needle slider 20 (that is, the movement amount of the inner needle 21), but this is within an allowable range. For example, the distances at which the inner needle 21 is actually slid are, for example, 11 mm, 16 mm, and 22 mm. In each case, the distances to pull the inner needle charge operation unit 30 are 22 mm, 32 mm, and 44 mm.
The above is the same principle as “when a moving pulley is used to lift an object, a force that is half the mass of the object is sufficient”. This principle will be schematically described with reference to FIG.

Consider a case where the inner needle charging operation unit 30 is slid to move the inner needle 21 that moves integrally with the pinion gear 302 from “projecting position: FIG. 9 a” to “charging position: FIG. 9 c”. It should be noted here that “the distance that the inner needle 21 actually moves is equal to the distance that the pinion gear 302 moves”, and this distance is “L”. That is, the distance that the inner needle 21 should move is “L”.
When the inner needle charging operation unit 30 is pulled to the intermediate position in FIG. 9B, the inner needle charging operation unit 30 has already moved by the distance “L”, but the pinion gear 302 (ie, the inner needle 21) Shows that only "L / 2" has moved.
By further pulling the inner needle charge operation unit 30, the pinion gear 302 (that is, the inner needle 21) can be pulled to the “charge position” in FIG. 9C. At this time, the inner needle charge operation unit 30 The amount of movement is “2L”.
As described above, the distance to pull the inner needle charging operation unit 30 is twice the actual movement amount of the inner needle 21, but the required force can be halved.

The principle of reducing the pulling force of the inner needle charge operation unit 30 has been described above. Similarly, the force required to pull the outer needle slider 60 against the biasing force of the outer needle spring 62 is also halved. be able to.
In the illustrated example (particularly, refer to FIG. 3 a), such a mechanism is applied to both the inner needle charge operation unit 30 and the outer needle charge operation unit 70. That is, the slide gear 701 is formed integrally with the outer needle charge operation unit 70, and the fixed gear rack 703 is formed integrally with the casing 11. The outer needle slider 60 rotatably holds a pinion gear 702 that engages with both the gear racks 701 and 703.
Although not shown, it is also possible to employ such a mechanism only in one of the inner needle charge operation unit 30 and the outer needle charge operation unit 70.

<< Modification in which sliders 20 and 60 are composed of two members that can slide relative to each other >>
In the embodiment described above with reference to FIGS. 1 to 5, the inner needle slider 20 holds the pinion gear 302, and both slide integrally.
A modification to this is shown in FIG. In this modification, the inner needle slider 20 includes a “slider body 20a” and a “sliding member 20b that can slide relative to the slider body”.

As shown in FIG. 6, a rib extending in the longitudinal direction is formed on the slider body 20a, and the slide member 20b slides thereon. Although not shown in FIG. 6, the slider body 20a holds the inner needle 21 (see FIG. 4). On the other hand, the slide member 20b holds the pinion gear 302 rotatably.
The slide member 20b can slide relative to the slider body 20a. However, when the slide member 20b comes into contact with the stopper 24, the relative slide is prohibited.

The effect of such a configuration will be described with reference to FIG. FIGS. 7A, 7B, and 7C correspond to the positional relationships of FIGS. 4A, 4B, and 4C. All the arrows in FIG. 7 indicate the direction of the force acting on the pinion gear 302 from the inner needle charge operation unit 30.
When the inner needle charging operation unit 30 is slid to the right in FIG. 1, the pinion gear 302 (and the slide member 20b) is slid to the right in FIG. 7 (a). At this time, since the slide member 20b is in contact with the stopper 24, the slider body 20a is driven (pushed) to move to the “charge position”. As described above, the slider body 20a is locked at this "charge position" (FIG. 7c).
Since this lock does not extend to the slide member 20b, when the inner needle charge operation portion 30 is biased to the left by a spring (not shown) (see the example of FIG. 8), the inner needle charge operation portion 30 is released. (When the finger to be operated is released), the pinion gear 302 and the slide member 20b are pulled back together with the inner needle charge operation unit 30 by the spring 72. On the other hand, the slider body 20a remains locked in the “charge position” (FIG. 7c).

According to such a configuration, the inner needle charge operation unit 30 can return to the “initial position (position shown in FIG. 1)” immediately after the charge operation. That is, when the lock is released and the inner needle is fired later, the inner needle charging operation unit 30 has already returned to the “initial position”. Therefore, when the inner needle is fired, there is an advantage that the inner needle charging operation unit 30 exposed to the outside of the apparatus does not move.
If the inner needle slider 20 moves only together with the pinion gear 302, the inner needle charging operation unit 30 exposed to the outside of the apparatus moves together when firing the inner needle. Further, if the inner needle charging operation unit 30 stops due to some trouble such as hitting a hand holding the device, the inner needle is also presented during the firing. According to the configuration described with reference to FIG. 6, there is no such inconvenience, and the operability of the biopsy device can be improved.

It should be noted that the outer needle slider 60 can similarly adopt a modified example composed of a “slider body 60a” and a “sliding member 60b that can slide relative to the slider body”. 6 and 7, reference numerals are written in parentheses.

<< Example of sharing a single spring for returning the charge operation units 30, 70 >>
In the case of the modification shown in FIGS. 6 and 7, the inner needle charging operation unit 30 is biased toward the “initial position” (the position before the operation shown in FIG. 1) by a spring. It is preferable to bias the inner needle 21 (and the inner needle slider 20) in a direction toward the “projection position”. Similarly, it is preferable that the outer needle charging operation unit 70 is also returned to the “initial position” by a spring.
In that case, each of the inner needle charge operation unit 30 and the outer needle charge operation unit 70 may be provided with a spring individually. However, as in the modification of FIG. 8, the inner needle charge operation unit 30 is provided with a protruding member 35. Thus, it can be shared by one spring (that is, one spring can be omitted to reduce the cost).

  As shown in FIG. 8, the inner needle charge operation unit 30 is provided with a protruding member 35 that can come into contact with the outer needle charge operation unit 70. In FIG. 8A, both the inner needle charge operation unit 30 and the outer needle charge operation unit 70 are in the “initial position”.

  FIG. 8 (b) shows a state in which only the outer needle charge operation unit 70 is slid (this is because in FIG. 2 (a), only the outer needle 61 is moved backward to remove the tissue on the recess 21a. This is the operation to take out. At this time, the outer needle charging operation unit 70 is urged toward the “initial position” by the spring 72 (another spring different from the outer needle spring 62). Return.

  FIG. 8C shows a case where only the inner needle charge operation unit 30 is slid. However, since the protruding member 35 is in contact with the outer needle charge operation unit 70, both the operation units 30 and 70 are eventually obtained. Is sliding. Although only the inner needle charging operation unit 30 cannot be slid by itself, the outer needle 61 is always charged when the inner needle 21 is charged, so there is no problem in use.

  The inner needle charge operation unit 30 itself is not provided with a spring for urging toward the “initial position”, and the spring 72 acting on the outer needle charge operation unit 70 is moved toward the “initial position”. It is energized. That is, when the inner needle charge operation unit 30 is released (the finger to be operated is released), the slider main body 20a stays at the “charge position”, while the slide member 20b has the inner needle charge operation unit 30 and the outer needle charge operation unit 70. At the same time, the spring 72 is pulled back to the “initial position”.

Thus, in the example of FIG. 8, it is not necessary to provide a spring for returning the inner needle charging operation unit 30 to the “initial position”, which is advantageous in reducing the cost.

DESCRIPTION OF SYMBOLS 1 Operation member 10 Biopsy apparatus 11 Casing 11a Casing upper piece 11b Casing lower piece 18, 19 Locking hole 20 Inner needle slider 21 Inner needle 21a Recess 22 Inner needle spring 25 Inner needle fixing part 26 Elastic engagement part 30 Inner needle charge operation part 31 Shaft 60 Outer needle slider 61 Outer needle 61a Cutting edge 62 Outer needle spring 65 Outer needle fixing part 66 Elastic engagement part 70 Outer needle charge operation part 71 Shaft 301, 701 Slide gear rack 302, 702 Pinion gears 303, 703 fixed gear rack

Claims (4)

The biopsy needle composed of the inner needle (21) and the outer needle (61) that slide relative to each other is held, and the inner needle and the outer needle are each locked at the “charge position”, and by releasing the lock, the “projection position” A biopsy device (10) that is fired into the

A casing (11);
While holding the inner needle (21), it is slidable between the “charge position” and the “projection position” within the casing, and is urged toward the “projection position” by the spring (22) for the inner needle. An inner needle slider (20);
An inner needle charging operation section (30) for sliding the inner needle slider (20) to the “charge position” against the urging force of the inner needle spring (22);
While holding the outer needle (61), it is slidable between the “charge position” and the “projection position” in the casing, and is biased toward the “projection position” by the outer needle spring (62). An outer needle slider (60);
An outer needle charging operation section (70) for sliding the outer needle slider (60) to the “charge position” against the urging force of the outer needle spring (62),

A biopsy device comprising any one or both of the following (A) and (B).

(A)
The inner needle charging operation portion (30) is provided with a slide gear rack (301) extending in the sliding direction, and the casing (11) is also provided with a fixed gear rack (303) extending in the sliding direction. And
The inner needle slider (20) rotatably holds the pinion gear (302) that engages with both the slide gear rack (301) and the fixed gear rack (303). When (30) is slid, the pinion gear (302) slides in the same direction while rotating, so the inner needle slider (20) also slides in the same direction.

(B)
The outer needle charging operation portion (70) is provided with a slide gear rack (701) extending in the sliding direction, and the casing (11) is also provided with a fixed gear rack (703) extending in the sliding direction. And
The outer needle slider (60) rotatably holds the pinion gear (702) that engages with both the slide gear rack (701) and the fixed gear rack (703). When (70) is slid, the pinion gear (702) slides in the same direction while rotating, so the outer needle slider (60) also slides in the same direction.
The biopsy device according to claim 1, comprising the configuration (A),

The inner needle charge operation part (30) is urged by a spring in a direction toward the “protruding position”,
The inner needle slider (20) includes a slider body (20a) that holds the inner needle (21) and a slide member (20b) that can slide relative to the slider body. 20b) holds the pinion gear (302) rotatably,
The slider body (20a) is provided with a stopper (24) that comes into contact with the slide member (20b) and stops the relative slide.
When the pinion gear (302) slides together with the inner needle charge operation section (30), the slide member (20b) comes into contact with the stopper (24) to drive the slider body (20a) to the “charge position”, and
When the inner needle charge operation part (30) is released, the slider body (20a) stays at the "charge position", while the slide member (20b) is pulled back together with the inner needle charge operation part (30) by the spring. Inspection device.
The biopsy device according to claim 1, comprising the configuration (B),

The outer needle charge operation part (70) is urged by a spring (72) in a direction toward the “projection position”,
The outer needle slider (60) includes a slider body (60a) that holds the outer needle (61) and a slide member (60b) that can slide relative to the slider body. 60b) holds the pinion gear (702) rotatably,
The slider body (60a) is provided with a stopper (64) that comes into contact with the slide member (60b) and stops the relative slide.
When the pinion gear (702) slides together with the outer needle charge operation section (70), the slide member (60b) comes into contact with the stopper (64) to drive the slider body (60a) to the “charge position”, and
When the outer needle charge operation part (70) is released, the slider body (60a) stays at the "charge position", while the slide member (60b) is pulled back together with the outer needle charge operation part (70) by the spring (72). A biopsy device.
The biopsy device according to claim 3, further comprising the configuration (A),

The inner needle charge operation part (30) includes a protruding member (35) that can come into contact with the outer needle charge operation part (70), and the spring (72) via the outer needle charge operation part (70). Is biased in the direction toward the "protruding position",
The inner needle slider (20) includes a slider body (20a) that holds the inner needle (21) and a slide member (20b) that can slide relative to the slider body, and the slide member (20b). ) Holds the pinion gear (302) rotatably,
The slider body (20a) is provided with a stopper (24) that comes into contact with the slide member (20b) and stops the relative slide.
When the pinion gear (302) slides together with the inner needle charge operation section (30), the slide member (20b) comes into contact with the stopper (24) to drive the slider body (20a) to the “charge position”, and
When the inner needle charge operation section (30) is released, the slider body (20a) stays at the “charge position”, while the slide member (20b) has an inner needle charge operation section (30) and an outer needle charge operation section (70). ) Together with the spring (72).

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