JPH04282145A - Biopsy needle device - Google Patents

Abstract

PURPOSE:To facilitate the piercing of the organs and to improve the hit probability. CONSTITUTION:A housing 4 engages with a base 2b of a corresponding needle in the retreat stroke when the inside needle 2 and an outside needle 3 are retreated, provides respective detaining pawls 121, 122 which permit the retreat thereof and prohibit the advance thereof and a means for releasing the engagement. The releasing means of the detaining pawls 12 is a releasing rod 13 which is arranged in parallel along an outside needle guiding and driving part 8 and an inside needle guiding and driving part 6 and is freely slidable in forward and backward directions and can be operated to advance by a prescribed distance by overcoming a spring means form the pause position energized and held by spring means 5, 7. The releasing rod 13 has two pieces of projecting parts of a backward front end 13a in contact with the rear detaining pawl 121 and a forward front end 13b in contact with the front detaining pawl 122. The advance distance from the pause position of the releasing rod 13 before the inside needle 2 is emitted is set shorter than the advance distance before the outside needle 3 is emitted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biopsy needle device used for tissue sampling, particularly a disposable type made of synthetic resin for prostate puncture (IPC: A
61B 10/00).

0002

[Prior Art] As a disposable type biopsy needle device, U
The one described in SP-4958625 is known. Furthermore, as disinfectable and reusable types, those described in JP-A-62-249641 and JP-A-1-198537 are known.

By the way, even in real-time organ puncture performed under ultrasonic echography control, the operability and accuracy of the biopsy needle device are extremely important considering the burden on the patient, and further improvement of their performance is desired. It was rare.

0004

[Problems to be Solved by the Invention] The present invention is capable of easily accumulating the potential energy required for firing the inner needle and the outer needle in a single action, and when firing the inner needle, the outer needle which should follow the firing of the inner needle can be easily stored. An object of the present invention is to provide a biopsy needle device that can contribute to facilitating organ puncture and improving accuracy by allowing the firing position and direction of the inner needle to be finely adjusted after firing.

[0005]

[Means for Solving the Problems] That is, the present invention provides a solid inner needle in which a needle tip and a concave portion on the side surface near the needle tip are provided at the tip and a needle hub at the rear end, and the inner needle is concentrically arranged. A double needle is a combination of a cylindrical outer needle that is slidably slidable in the axial direction on the outside and has a needle tip at the tip and a needle base at the rear end, and the inner needle is pressed by pressing the needle base. an inner needle guide drive unit housing an inner needle firing spring for driving the outer needle in the forward direction from the retracted position to the forward position; An outer needle guide drive unit housing an outer needle firing spring is arranged in series with the former at the back and the latter at the front, and the inner needle and the outer needle are moved against the corresponding firing springs. A biopsy needle device comprising: excitation means common to the inner and outer needles for causing the inner and outer needles to move backward from the forward position to the retracted position to accumulate potential energy in both firing springs; The method includes respective locking pawls that engage the needle bases of the corresponding needles in the backward stroke in which the needles are retreated, allowing the needle bases to retreat and preventing them from moving forward, and means for releasing the locking pawls. The locking pawl release means is a single release rod slidable in the front and back direction that is disposed substantially parallel to the outer needle guide drive section and the inner needle guide drive section that are arranged in series, and includes a spring means. The release lever can be operated forward a predetermined distance from the rest position biased and held by the spring means, and the release lever has its rear tip that contacts the rear locking claw and the front end that contacts the front locking claw. The release lever has two protrusions with a front tip and the rear tip comes into contact with a corresponding rear locking pawl to release the lock and fire the inner needle. (2) The forward distance until the front tip abuts the corresponding front locking claw and fires the outer needle is longer than the forward distance from the rest position, or (2) Respective locking pawls in which the housing engages with the needle bases of corresponding needles in a stroke in which the inner needle and the outer needle are retreated by the excitation means, allowing the needle bases to retreat and preventing them from moving forward; and a release means for the locking pawl, and the excitation means includes an accumulator which is slidable in the front and rear direction and is provided with a traction protrusion that drives the corresponding needle base backward;
or (3) the housing is configured such that the inner needle and the outer needle are retracted by the excitation means. The needle base is provided with respective locking pawls that engage the needle bases of the corresponding needles in the backward stroke of the needle to allow the needle bases to retreat and prevent them from moving forward, and a means for releasing the locking pawls. , the outer needle guide drive unit includes a slider that moves the rear end position of the outer needle firing spring a predetermined distance rearward from the normal rest position, and is capable of independently retracting the outer needle. shall be.

[0006]

[Embodiment] In one embodiment of the present invention shown in FIGS. 1 to 3, 1 is a conventional double needle for biopsy consisting of an inner needle (stylet) 2 and an outer needle (cannula) 3. The inner needle has a solid shape with a needle tip 2a and a sample collection recess 2c on the side surface near the tip, and a needle base 2b at the rear end, while the outer needle has a needle base 2b at the rear end. It has a cylindrical shape that is shorter than a needle, and is fitted over the concentric outer side of the inner needle so as to be able to slide freely in the axial direction, and has a needle tip 3a at the tip and a needle base 3b at the rear end. Reference numeral 4 denotes a housing that supports the double needle in a manner that it can freely protrude and retract for a predetermined length, and the one side member and the other side member of substantially the same shape are combined into a capsule shape and integrated with a screw (not shown). It is something. The housing includes an inner needle guide drive unit 6 housing an inner needle firing spring 5 for pressing the needle base 2b of the inner needle and driving the inner needle from the retracted position to the forward position along the axis; The former has an outer needle guide drive unit 8 housing an outer needle firing spring 7 for pressing the needle base 3b of the outer needle and driving the outer needle along the axis from the retracted position to the forward position. They are arranged in series with the latter at the front.

Reference numeral 9 denotes a common excitation means for the inner and outer needles for retracting the inner and outer needles from the forward position to the retracted position against the respective firing springs, thereby accumulating potential energy in both firing springs in advance. be. In this embodiment, the excitation means has a terminal end rotatably attached to a pin 4a provided at the rear end of the housing, and an operating handle 10 at the distal end.
A bifurcated rotating rod 10 having a shape of 1.a is housed in the housing so as to be slidable a predetermined distance in the front and back direction on both sides of the serial inner and outer needle guide drive parts. (See FIG. 2). Elongated holes 10c are formed in the opposing side walls of the bifurcated rotating armatures in the longitudinal direction, and protruding shafts 11c that fit loosely into the elongated holes are formed at the rear ends of the pair of accumulating armatures. The rotating motion of the rotating arm is converted into a reciprocating motion of the accumulating arm. Traction projections 11a and 11b are formed at corresponding positions of the energy storage lever to engage with opposing sides of the needle bases of the inner and outer needles during the backward stroke, respectively, and are operable. By opening the handle 10a upward from the rest position along the upper wall surface of the housing, the inner needle and the outer needle are driven backward from the forward position to the retracted position against the respective firing springs.

Reference numerals 121 and 122 are respective locking claws rotatably pivoted at positions near the corresponding inner needle guide drive unit or outer needle guide drive unit, and are driven by the excitation means to engage the inner needle. In the process of retracting the outer needle and storing potential energy in the corresponding firing spring, the outer needle engages with the needle base of the corresponding needle, allowing the needle base to retreat and preventing the needle base from moving forward. Reference numeral 13 denotes a release lever attached to the housing so as to be slidable a predetermined distance in the front and back direction below the inner and outer needle guide drive units arranged in series, and each locking claw It has two tip portions 13a, 13b corresponding to a rear end piece 12b to be described later, and one rear end portion 13c that is manually operated. The release lever normally comes into contact with the rear end piece 12b of the rear locking pawl 121, and is held at the fully retracted rest position by the action of a torsion coil spring (not shown). In other words, each of the front and rear locking claws is caused by a torsion coil spring (not shown) attached to each rotation center shaft 12c, so that the claw tip 12a of each of the locking claws is always connected to the corresponding inner needle or outer needle. The rear end piece 12b of each locking pawl is biased in the direction of engagement with the needle base of the needle, while the rear end piece 12b of each locking pawl is connected to the corresponding tip portion 13a, 1 of the release lever 13.
3b so as to be able to engage with each other in the forward movement stroke thereof. By the way, the formation position of the front tip part 13b that comes into contact with the front locking claw 122 is so that the outer needle is fired after the inner needle. It is provided at a position relatively shifted to the rear compared to the formation position of 13a. Therefore, when moving forward from the rest position, the rear end portion corresponds to the rear locking claw 121.
Compared to the forward distance of the release lever until the inner needle is unlocked by The forward distance to release the stop is longer. Note that a spring means for biasing the release lever to the rest position may be separately provided between the release lever and the member of the casing, regardless of the locking claw.

15 moves the rear end position of the outer needle firing spring 7 housed in the outer needle guide drive unit 8 a predetermined distance rearward from the normal rest position, thereby independently retracting the outer needle and releasing the inner needle. This is an outer needle retraction mechanism for making it easier to take out the specimen collected in the recess 2c from the double needle. That is, 16 is a slider disposed behind the outer needle firing spring in the outer needle guide drive unit and housed so as to be slidable back and forth and rotatable about the axis of the double needle. As shown in FIG. 1, a knob 16a projects outward through an inverted L-shaped opening 17 provided in the housing and the operating handle 10a. A knob 16a that engages the opening allows the slider to move into the reverse L position after the inner and outer needles have been fired.
It can be moved from a normal rest position where the knob is fitted and locked in the horizontal groove of the inverted L-shaped opening to a retracted position rearwardly regulated by the end of the vertical groove of the inverted L-shaped opening.

0010

[Operation] Now, from the released state shown in FIG. 3, when the operating handle 10a is opened upward from the rest position of the rotation lever 10 along the upper wall surface of the housing and the energy storage lever 11 (FIG. 2) is retreated, Driven by the accumulating force, the inner needle 2 and outer needle 3 are moved backward against the corresponding firing springs 5 and 7. When the inner and outer needles are retracted a predetermined distance and reach the retracted position, the needle bases 2b. The locking claws 121 and 122 corresponding to the needles 3b engage with each other to prevent the inner and outer needles from retreating, resulting in the stored energy state shown in FIG. 4. From this state, the operating handle 10a is closed and returned to its original resting position along the upper wall surface of the casing, resulting in the piercing state shown in FIG. In this state, a double needle is inserted into the patient. First, the inner needle 2 is fired at the affected area or a position near it. That is, by moving the rear end 13c of the release lever 13 slightly forward against the torsion coil spring, the rear locking claw 1 is first released.
21 Release the lock. As a result, the inner needle is rapidly advanced a predetermined distance by the force of the firing spring 5, resulting in the inner needle firing state shown in FIG. Thereafter, by further operating the release lever forward, the outer needle is ejected. That is, the locking of the front locking pawl 122 is released, and the outer needle 3 is rapidly advanced a predetermined distance by the force of the firing spring 7, resulting in the outer needle firing state shown in FIG. 7. After collecting and storing the specimen in the recess 2c of the inner needle in this manner, the double needle is pulled out of the body from the affected area. Then, the knob 16a of the slider 16 is rotated to release the engagement with the horizontal groove 17a of the inverted L-shaped opening 17 at the rest position, and the rear end of the vertical groove 17b of the inverted L-shaped opening is regulated. By moving the slider to the rearward retracted position, the sample retrieval state shown in FIG. 8 is achieved. In this state, the outer needle is retracted a predetermined distance compared to the inner needle, and the recess containing the specimen is exposed.

[0011]

[Effects of the Invention] Since the present invention is constructed as described above, it is possible to easily accumulate the potential energy necessary for firing the inner needle and the outer needle in one action, or to fire them following the firing of the inner needle. It is possible to provide a biopsy needle device that makes it possible to finely adjust the firing position and direction of the outer needle after firing the inner needle, thereby contributing to facilitating the organ puncture method and improving accuracy of hit.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of a biopsy needle device according to the present invention in a released state.

FIG. 2 is a sectional view corresponding to FIG. 1;

FIG. 3 is a side sectional view of the above embodiment in a released state.

FIG. 4 is a side sectional view of the same state in which energy is stored.

FIG. 5 is a side sectional view of the penetrating state.

FIG. 6 is a side sectional view of the inner needle in the ejected state.

FIG. 7 is a side cross-sectional view of the outer needle in the ejected state.

FIG. 8 is a side cross-sectional view of a state in which a specimen is taken out.

[Explanation of symbols]

1 Double needle 2 Inner needle 3 Outer needle 4 Housing 5 Inner needle firing spring 6 Inner needle guide drive unit 7 Outer needle firing spring 8 Outer needle guide drive unit 9 Excitation means 10 Rotating lever 11　　　　　　　　　　　　Storage 121 Rear locking claw 122 Front locking claw 13. Cancellation 15 Outer needle retraction mechanism 16 Slider 17 Inverted L-shaped opening

Claims (3)

[Claims] Claim 1: A solid inner needle 2 having a needle tip 2a and a concave portion 2c on the side surface near the needle tip at the tip and a needle base 2b at the rear end.
A combination of a double needle 1 and a cylindrical outer needle 3 which is slidably fitted in the axial direction on the concentric outer side of the inner needle and has a needle tip 3a at the tip and a needle base 3b at the rear end. , an inner needle guide drive unit 6 housing an inner needle firing spring 5 for pressing the needle base 2b and driving the inner needle in the forward direction from the retracted position to the forward position; An outer needle guide drive unit 8 housing an outer needle firing spring 7 for driving the needle in the forward direction from the retracted position to the forward position is arranged in series with the former at the rear and the latter at the front. A biopsy needle device consisting of a body 4 and a common excitation means 9 for the inner and outer needles for retracting the inner and outer needles from the forward position to the retracted position against the corresponding firing springs and accumulating potential energy in both firing springs. In this case, the housing engages with the base of the corresponding needle during a backward stroke in which the inner needle and the outer needle are retreated by the excitation means, and each engages with the needle base of the corresponding needle to allow the needle base to retreat and prevent the needle base from moving forward. Retaining claws 121, 12
2, and a release means for the locking pawl, the release means for the locking pawl being arranged in a front-rear direction substantially parallel to the outer needle guide drive section and the inner needle guide drive section arranged in series. A single slidable release lever 13 is operable to move forward a predetermined distance from a rest position biased and held by a spring means against the spring means, and the release lever is connected to a rear locking pawl 121. It has two protrusions: a rear tip 13a that comes into contact with the front locking claw 121, and a front tip 13b that comes into contact with the front locking claw 122, and the rear tip comes into contact with the corresponding rear locking claw 121. Compared to the forward distance of the release lever from the rest position until it contacts and releases the lock and fires the inner needle 2, the front tip comes into contact with the corresponding front lock claw 122. The forward distance until the outer needle 3 is fired is longer, and when the release lever is slid forward from the rest position, the inner needle is fired first, and then the outer needle is fired. A biopsy needle device characterized in that: Claim 2: A solid inner needle 2 having a needle tip 2a and a concave portion 2c on the side surface near the tip at the tip and a needle base 2b at the rear end.
A combination of a double needle 1 and a cylindrical outer needle 3 which is slidably fitted in the axial direction on the concentric outer side of the inner needle and has a needle tip 3a at the tip and a needle base 3b at the rear end. , an inner needle guide drive unit 6 housing an inner needle firing spring 5 for pressing the needle base 2b and driving the inner needle in the forward direction from the retracted position to the forward position; An outer needle guide drive unit 8 housing an outer needle firing spring 7 for driving the needle in the forward direction from the retracted position to the forward position is arranged in a housing 4 with the former at the rear and the latter at the front. , a biopsy needle device comprising common excitation means 9 for the inner and outer needles for retracting the inner needle and the outer needle from the forward position to the retracted position against the corresponding firing springs to accumulate potential energy in both firing springs. The housing is
Respective locking claws 121 and 122 that engage the needle bases of the corresponding needles in the stroke in which the inner and outer needles are retreated by the excitation means, allowing the needle bases to retreat and preventing them from moving forward; The excitation means includes traction projections 11a, 1 which drive the corresponding needle hubs backward.
1b, which is slidable in the front-rear direction; and a bifurcated rotating lever 10, one end of which is pivoted to the rear end of the housing with a pin 4a, and the other end of which is formed with an operating handle 10a. It consists of
The rotating motion of the rotating arm is converted into a reciprocating motion of the accumulating arm through a rotation-to-linear motion conversion mechanism configured at a joint between the rotating arm and the accumulating arm. A biopsy needle device characterized in that: 3. A solid inner needle 2 having a needle tip 2a and a concave portion 2c on the side surface near the tip at the tip and a needle base 2b at the rear end.
A combination of a double needle 1 and a cylindrical outer needle 3 which is slidably fitted in the axial direction on the concentric outer side of the inner needle and has a needle tip 3a at the tip and a needle base 3b at the rear end. , an inner needle guide drive unit 6 housing an inner needle firing spring 5 for pressing the needle base 2b and driving the inner needle in the forward direction from the retracted position to the forward position; An outer needle guide drive unit 8 housing an outer needle firing spring 7 for driving the needle in the forward direction from the retracted position to the forward position is arranged in a housing 4 with the former at the rear and the latter at the front. , a biopsy needle device comprising common excitation means 9 for the inner and outer needles for retracting the inner needle and the outer needle from the forward position to the retracted position against the corresponding firing springs to accumulate potential energy in both firing springs. The housing is
Respective locking claws 121 and 122 that engage the needle bases of the corresponding needles during the backward stroke in which the inner needle and the outer needle are retreated by the excitation means, allowing the needle bases to retreat and preventing them from moving forward;
and a release means 13 for the locking pawl, and
The outer needle guide drive unit is characterized in that it includes a slider 16 that moves the rear end position of the outer needle firing spring a predetermined distance rearward from the normal rest position, and is capable of independently retracting the outer needle. biopsy needle device.