CN215739127U - Handle with self-locking function and biopsy needle comprising handle - Google Patents

Abstract

The utility model discloses a self-locking handle and a biopsy needle comprising the same, and belongs to the technical field of medical instruments. The handle with the self-locking function comprises a shell, a to-be-launched component, a tightening mechanism and a launching mechanism, wherein the to-be-launched component, the tightening mechanism and the launching mechanism are arranged in the shell, operating parts of the tightening mechanism and the launching mechanism extend out of the shell, the tightening mechanism moves to a tightening position to tighten the to-be-launched component, the launching mechanism acts on the to-be-launched component tightened at the tightening position to launch the to-be-launched component, and the safety mechanism capable of achieving self-locking is further included. The handle can prevent the accidental touch and has better safety.

Description

Handle with self-locking function and biopsy needle comprising handle

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to a biopsy needle and a handle thereof.

Background

At present, the mechanical integrated biopsy needle has been widely applied to medical activities. From the differences in tissue cutting patterns, motorized integrated biopsy needles can be divided into two main types, fluted cutting and tubular cutting. While the conventional motor-driven integrated biopsy needle on the market mainly takes groove type cutting as a main part, the tubular cutting biopsy needle accounts for relatively less problems due to the design and processing cost. However, in the case of the mechanical integrated biopsy needle, the sampling integrity and stability of the tubular cutting biopsy needle are superior to those of the groove type cutting biopsy needle.

CN209332111U discloses a biopsy needle with a driving device, which comprises a needle core, a middle sleeve for obtaining biopsy tissue of a punctured part, wherein the front part of the middle sleeve is provided with a notch part at the periphery; the outer sleeve is movably sleeved outside the middle sleeve, the front end of the outer sleeve is provided with a blade part, and the blade part can extend into the gap part to cut off the biopsy tissue in the middle sleeve; and the driving device is used for fixing the needle core and driving the middle sleeve and the outer sleeve to retreat or advance relatively on the needle core. The biopsy needle utilizes the needle core to puncture a biopsy part, then utilizes the driving device to control the middle sleeve and the outer sleeve to move forwards and sample simultaneously, utilizes the structure of the middle sleeve to sample biopsy tissues, utilizes the forward inertia force of the outer sleeve to drive the blade part to penetrate through the notch part on the middle sleeve to cut off the biopsy tissues in the middle sleeve, and intercepts the biopsy tissues in the middle sleeve. However, the biopsy needle adopts a fixed seat to be launched on the loading group, needs two hands to operate, and limits the application scene. What is more critical is that the biopsy piece lacks a safety mechanism, does not have a self-locking function, is easy to touch by mistake (excitation by mistake), and has poor safety.

Disclosure of Invention

The utility model mainly aims to provide a handle with self-locking function and a biopsy needle comprising the handle, so that the use safety of the instrument is improved.

Specifically, the handle with self-locking of the utility model adopts the technical scheme that: the device comprises a shell, a part to be launched, an tightening mechanism and a launching mechanism, wherein the part to be launched, the tightening mechanism and the launching mechanism are arranged in the shell, operation parts of the tightening mechanism and the launching mechanism extend out of the shell, the tightening mechanism drives the part to be launched to move to a tightening position to tighten the part, the launching mechanism acts on the part to be launched tightened at the tightening position to launch the part, and the device is characterized by further comprising a safety mechanism, the safety mechanism comprises an unlocking button, an unlocking limiting block and a pre-tightening device, the unlocking button is provided with an unlocking baffle and a locking buckling position and an unlocking buckling position which are adjacently arranged, the pre-tightening device acts on the unlocking button to enable the unlocking button to be kept in a locking state when the unlocking button is not pressed by external force, the unlocking limiting block synchronously moves along with the part to be launched, the unlocking limiting block is provided with a free end, and when the part to be launched is at the tightening position, the free end of the unlocking limiting block moves to the locking buckling position, when the unlocking button is pressed by external force, the free end of the unlocking limiting block is extruded by the locking buckle position to enable the locking buckle position to be released, so that the unlocking buckle position behind the locking buckle position and the free end of the unlocking limiting block are clamped and limited to keep the unlocking button in an unlocking state, the unlocking baffle is located at a position for preventing the transmitting mechanism from transmitting the part to be transmitted when the unlocking button is in the locking state, and is withdrawn from the position for preventing the transmitting mechanism from transmitting the part to be transmitted when the unlocking button is in the unlocking state.

Further, the pre-tightening device is an unlocking spring acting on the unlocking button.

Furthermore, the locking buckle position is provided with an inclined plane, the free end of the unlocking limiting block is provided with a corresponding stress-deformable inclined plane, and the locking buckle position extrudes the stress-deformable inclined plane of the free end of the unlocking limiting block through the inclined plane.

Further, the firing mechanism is provided with a first firing button, the first firing button acts on the to-be-fired component tightened at the tightening position to fire the to-be-fired component, the unlocking baffle is located at a position preventing the first firing button from firing the to-be-fired component when the unlocking button is in the locking state, and the unlocking baffle is withdrawn from the position preventing the first firing button from firing the to-be-fired component when the unlocking button is in the unlocking state.

Furthermore, the shell is provided with a buckling piece at the fastening position, the component to be launched is fastened by buckling with the buckling piece, and the first firing button acts on the component to be launched to enable the component to be launched to be unbuckled with the buckling piece so as to be launched.

Furthermore, the launching mechanism is provided with a second firing button, and the second firing button drives the first firing button to launch the piece to be launched through a connecting piece between the second firing button and the first firing button.

The utility model comprises the biopsy part with the self-locking handle and also comprises a needle body assembly, wherein the needle body assembly comprises an outer needle tube, an outer needle tube seat, an inner needle tube seat, a needle core and a needle core seat, the outer needle tube seat, the inner needle tube seat and the needle core seat are all arranged in a shell, the inner needle tube seat is a part to be launched, the tail end of the outer needle tube is fixed on the outer needle tube seat, a passage is formed in the outer needle tube seat, the inner needle tube penetrates through the passage formed by the outer needle tube and the outer needle tube seat, the tail end of the inner needle tube is fixed on the inner needle tube seat, a passage is formed in the inner needle tube seat, the tail end of the needle core is fixed on the needle core seat, the needle core penetrates through the passage formed by the inner needle tube and the inner needle tube seat, the tip of the outer needle tube is provided with a section of clamping tongue bent towards the axis, the tip of the inner needle tube is provided with a plurality of blades, a notch is arranged on the side wall close to the needle tip, and the tip of the needle core is provided with a plurality of blades.

Furthermore, the rear end of the outer needle tube seat is provided with a fixed limit buckle, two sides of the fixed limit buckle are movable limit buckles, the front end of the inner needle tube seat is correspondingly provided with a fixed limit groove, two sides of the fixed limit groove are provided with movable limit grooves, the movable limit grooves are provided with a first buckle position and a second buckle position, the fixed limit buckles correspond to the fixed limit grooves, the movable limit buckles correspond to the movable limit grooves, the first buckle position and the second buckle position form two positions of the movable limit buckle in the movable limit grooves, the outer needle tube seat and the inner needle tube seat are connected with the limit grooves through the limit buckles, the outer needle tube seat and the inner needle tube seat can slide in a limited distance X, and the distance X is equal to the distance between the first buckle position and the second buckle position.

Furthermore, the two movable limit buckles of the outer needle tube seat are also provided with sliding upright posts, the tightening mechanism is provided with a sliding inclined plane and a sliding stop block, the sliding inclined plane can act on the sliding upright posts to enable the movable limit buckles to be opened and separated from the first buckling positions, and the sliding stop block can drive the outer needle tube seat to slide on the inner needle tube seat after the movable limit buckles are separated from the first buckling positions, so that the two movable limit buckles of the outer needle tube seat move to the second buckling positions.

Furthermore, the needle tube seat further comprises a positioning mechanism, the positioning mechanism comprises a positioner, a plurality of limiting structures matched with the positioner are arranged in the shell, positioning distances with different lengths are formed, and when the inner needle tube seat moves to the position of the positioner after being launched, the limitation on the launching distance of the inner needle tube seat is formed.

The utility model has the following beneficial effects: the handle is provided with the safety mechanism with the self-locking function, the safety mechanism can prevent the launching mechanism from launching during self-locking, when the tightening mechanism tightens the part to be launched and presses the safety mechanism, the safety mechanism releases the prevention of the launching mechanism, and the part to be launched can be launched safely through the launching mechanism, so that the handle can prevent mistaken touch and has better safety. And the tightening mechanism can be operated by one hand, the operation is convenient, and the application scenes are more.

Drawings

Fig. 1 is a schematic view of a right housing of embodiment 1 of the present invention.

Fig. 2 is a schematic view of the left shell of embodiment 1 of the present invention.

FIG. 3 is a schematic view of the inner needle tube and the inner needle tube holder according to embodiment 1 of the present invention.

FIG. 4 is a schematic view of the outer needle cannula and the outer needle hub according to embodiment 1 of the present invention.

Figure 5 is a schematic view of a core and core holder of example 1 of the present invention.

Fig. 6 is a perspective view of the tightening button of embodiment 1 of the present invention.

Fig. 7 is a bottom view of the tightening button of embodiment 1 of the present invention.

Fig. 8 is a perspective view of an unlock button of embodiment 1 of the present invention.

Fig. 9 is a side view of the unlock button of embodiment 1 of the present invention.

Fig. 10 is a schematic view of an unlocking stopper in embodiment 1 of the present invention.

Fig. 11 is a partially enlarged view of the free end of the unlocking stopper in embodiment 1 of the present invention.

FIG. 12 is a schematic view of the back firing button of embodiment 1 of the present invention.

FIG. 13 is a side view of the back firing button of embodiment 1 of the present invention.

FIG. 14 is a top view of the rear firing button of embodiment 1 of the present invention.

FIG. 15 is a schematic view of the fit between the outer hub and the inner hub when tightened and un-loosened according to embodiment 1 of the present invention.

Fig. 16 is a schematic view of the cooperation of the tightened and un-loosened unlock button, the unlock stopper, and the back trigger button according to embodiment 1 of the present invention.

Fig. 17 is a schematic view of the fit between the main components when tightened and un-unlocked according to embodiment 1 of the present invention.

Fig. 18 is a schematic view 2 of the fit between the main components when tightened and not unlocked according to embodiment 1 of the present invention.

Fig. 19 is a schematic view of the fit between the main components when tightened and unlocked according to embodiment 1 of the present invention.

Fig. 20 is a schematic view 2 of the fit between the main components when tightened and unlocked according to embodiment 1 of the present invention.

Fig. 21 is a schematic diagram showing the cooperation of the main parts after the puncture is fired in embodiment 1 of the present invention.

FIG. 22 is a schematic view showing the engagement between the outer needle hub and the inner needle hub after the puncture by shooting in example 1 of the present invention.

1: a right shell; 101: mounting the upright post; 102: buckling the baffle; 121: tightening the sliding groove; 122: positioning the sliding groove; 122-1: a first limit; 122-2: second limiting; 122-3: third limiting;

2: a left shell; 201: a sliding mounting groove;

3: an outer needle tube; 301: a latch;

4: an outer needle tube base; 401: fixing a limit buckle; 402: a movable limit buckle; 403: sliding the upright post;

5: an inner needle tube; 501: a notch;

6: an inner needle tube seat; 601: fixing a limit groove; 602: a movable limiting groove; 602-1: a first buckling position; 602-2: a second buckling position; 603: buckling;

7: a needle core;

8: a needle core seat;

9: tightening the button; 901: a sliding ramp; 902: a sliding stopper; 903: pulling a hook;

10: a firing spring;

11: a return spring;

12: a rear firing button; 1201: resetting the cantilever; 1202: the mistaken touch prevention baffle plate;

13: connecting a bracket;

14: a side firing button;

15: an unlock button; 1501: unlocking the baffle; 1502: locking and buckling positions; 1503: unlocking the buckle position;

16: unlocking the limiting block;

17: an unlocking spring;

18: a positioner; 1801: positioning a plane; 1802: the inclined plane is positioned.

Detailed Description

The present invention will be described in further detail with reference to the following examples and the accompanying drawings.

Example 1:

one embodiment of the present invention, a single use biopsy needle, is shown in fig. 1-22, and comprises a housing assembly a, a needle assembly B, a tightening mechanism C, a firing mechanism D, a safety mechanism E, and a positioning mechanism F, all mounted within the housing assembly a.

Shell subassembly A includes right casing 1 and left casing 2, and the similar cuboid structure of two constitution, shell subassembly A surface is equipped with anti-skidding structure. The length dimension direction of the shell component A is defined as front and back, namely the front end is the extending direction of the needle body, the back end is the extending direction deviating from the needle body, the width dimension direction is defined as up and down, and the thickness direction is defined as left and right.

The right shell 1 is provided with an installation upright post 101 and a buckling baffle plate 102, and the left shell 2 is provided with a sliding installation groove 201. The right shell 1 and the left shell 2 are combined to form a tightening sliding groove 121 and a positioning sliding groove 122, wherein a first limit 122-1, a second limit 122-2 and a third limit 122-3 are arranged on the inner side of the positioning sliding groove, and each limit is provided with a limit plane and a limit inclined plane structure.

The needle body component B comprises an outer needle tube 3, an outer needle tube seat 4, an inner needle tube 5, an inner needle tube seat 6, a needle core 7 and a needle core seat 8.

The outer needle tube 3 has a tip end and a tail end, the tip end is provided with a section of clamping tongue 301 bending towards the axis, the tail end is fixed on the outer needle tube seat 4 to form an outer needle tube component B1, and a passage is formed in the outer needle tube seat 4. The inner needle tube 5 penetrates through a passage formed by the outer needle tube and the outer needle tube seat, the inner needle tube 5 is provided with a tip and a tail end, the tip is of a multi-surface edge structure, a notch 501 is arranged on the side wall close to the needle tip, the tail end of the inner needle tube is fixed on the inner needle tube seat 6 to form an inner needle tube component B2, and a passage is formed in the inner needle tube seat 6. The stylet 7 has a tip and a tail end, the tip is also multi-faceted, and the tail end is fixed to the stylet holder 8 to form a stylet assembly B3, which is passed through the passage formed by the inner needle tube 5 and the inner needle tube holder 6. The inner needle tube base 5 is a part to be shot.

The rear end of the outer needle tube seat 4 is provided with a fixed limit buckle 401, the two sides of the fixed limit buckle 401 are of a left cantilever structure and a right cantilever structure, the two cantilever structures are provided with movable limit buckles 402, and the two movable limit buckles 402 are also provided with sliding upright posts 403. The front end of the inner needle tube seat 6 is correspondingly provided with a fixed limiting groove 601, two sides of the fixed limiting groove 601 are provided with movable limiting grooves 602, wherein the movable limiting grooves 602 are provided with a first buckling position 602-1 and a second buckling position 602-2. The fixed limiting buckle 601 corresponds to the fixed limiting groove 602, the movable limiting buckle 402 corresponds to the movable limiting groove 602, and the first buckle position 602-1 and the second buckle position 602-2 form the movable limiting buckle 402 buckled at two positions of the movable limiting groove 602. The outer needle tube seat 4 and the inner needle tube seat 6 are connected with the limiting groove through the limiting buckle, the outer needle tube seat and the inner needle tube seat can slide in a limited way within a distance X, and the size of the distance X is equal to the distance between the first buckling position 602-1 and the second buckling position 602-2.

The outer needle tube seat 4 and the inner needle tube seat 6 are both arranged in the shell component A, and can slide backwards for a long distance Y in the shell component A under the action of external force. The needle core 7 is fixed in the housing assembly a by a needle core holder 8, both of which are immovable.

The outer needle assembly B1 and the inner needle assembly B2 have two states: a post-puncture state and a state to be punctured.

In the state after puncture, the needle point of the inner needle tube 5 is at the most front end, the clamping tongue 301 at the tip end of the outer needle tube 3 is clamped in the notch 501 on the inner needle tube, the needle core 7 is arranged inside the inner needle tube 5 and is obviously away from the tip end of the inner needle tube 5 by a distance Z, and the space occupied by the distance Z is used for storing tissue samples. At this time, the movable limit button 402 of the outer needle tube holder 4 is located at the first button position 602-1 of the movable limit groove 602 of the inner needle tube holder 6.

In the state of puncture, the latch 301 at the tip of the outer needle tube 3 is withdrawn from the inner needle tube 5, and the cutting edge of the needle point of the needle core 7 extends out and is longer than the needle point of the inner needle tube 5. At this time, the front end of the inner needle tube seat 6 is attached to the rear end of the outer needle tube seat 4, and at this time, the movable stopper 402 of the outer needle tube seat 4 is located at the second stopper position 602-2 of the movable stopper groove 602 in the inner needle tube seat 6, and the inner needle tube assembly B2 and the outer needle tube assembly B1 are moved toward the rear end by the distance Y and fixed together.

When the needle tube component B punctures, the inner needle tube component B2 and the outer needle tube component B1 move forward rapidly at the same time to complete the cutting of the tissue, the inner needle tube component B2 stops after moving for a distance Y, the outer needle tube component B1 continues to move forward for a distance X under the action of inertia, the movable limit buckle 402 also extrudes the movable limit groove 602 under the action of inertia so as to be separated from the second buckle position 602-2 and move forward to the first buckle position 602-1 for buckling, and the clamping tongue 301 at the tip of the outer needle tube 3 enters the movable limit groove from the notch 501 at the tip of the inner needle tube 5 to complete the cutting of the tissue.

The tightening mechanism C comprises a tightening button 9, a firing spring 10 and a return spring 11.

The top of the tightening button 9 extends out of the shell assembly A through the tightening sliding groove 121 to form an operation part, the bottom of the tightening button 9 is installed in the shell assembly A, sliding inclined planes 901 and sliding stoppers 902 are arranged on two sides of the bottom of the tightening button 9, the tightening button 9 can slide back and forth in the shell assembly A, and the sliding distance is larger than the distance Y. The front end of the tightening button 9 is provided with a draw hook 903 which can be connected with the rear end of a return spring 11, and the front end of the return spring is fixed on a mounting upright 101 of the right shell 1. When the tightening button 9 is forced to start moving to the rear end, the sliding pillar 403 on the movable stopper 402 of the outer needle tube holder 4 will be spread to both sides and separated from the first fastening position 602-1 by the sliding slope 901 at the bottom of the tightening button. When the tightening button 8 is pushed further, the sliding stopper 902 at the bottom of the tightening button drives the outer needle tube seat 4 to move backward, so as to urge the movable stopper 402 of the outer needle tube seat to move to the second fastening position 602-2, and at this time, the rear end of the tightening button 9 will be attached to the inner needle tube seat 6, i.e. the latch 301 at the tip of the outer needle tube 3 moves backward relative to the notch 501 at the tip of the inner needle tube 5, and exits the inner needle tube 5. At this point, the return spring 11 is stretched, creating a forward pulling force that urges the tightening button 9 to return to the starting position.

The firing spring 10 has a front end in contact with the inner needle hub 6 and a rear end in contact with the housing assembly A. The central axis of the firing spring 10 is parallel to or coincident with the axis of the inner needle tube 5, and has a certain forward pre-tension on the inner needle tube assembly B2.

The rear end of the inner needle tube seat 6 is provided with a buckle 603, when the rear end of the tightening button 9 is contacted with the inner needle tube seat 6 and then moves backwards continuously, the return spring 11 is stretched continuously, the firing spring 10 is compressed, and meanwhile, the outer needle tube component B1 is driven to move backwards synchronously. After moving the distance Y, the engaging baffle 102 on the right housing 1 is engaged with the engaging member 603 at the rear end of the inner needle tube holder 6 as an engaging member, and at this time, the tightening of the inner needle tube assembly B2 and the outer needle tube assembly B1 is completed. The force application is stopped, and the tightening button 9 is pulled forward by the return spring 11 and returns to the initial position.

The firing mechanism D includes a rear firing button 12, a connecting bracket 13, and a side firing button 14.

The rear firing button 12 is used as a first firing button, and has reset cantilevers 1201 on the left and right sides and a mis-touch prevention baffle 1202 on the lower part. The back firing button 12 is mounted at the rear end of the housing assembly a and can slide within a certain range under the action of a forward external force, and the elastic cantilever 1201 generates an elastic force for resetting the back firing button 12 under the action of the external force. The rear firing button 12 can be returned to its original position by the resilient cantilever 1201 when the external force is removed. The rear end of the shell component A is provided with a through hole, and the rear firing button 12 protrudes out of the shell through the through hole by a certain height to be used as an operation part.

The side firing button 14 is used as a second firing button, and drives the rear firing button 12 to fire the to-be-fired piece through a connecting bracket 13 between the side firing button and the rear firing button 12. The connecting bracket 13 is disposed inside the housing assembly a, penetrates through the front and rear ends of the housing assembly a, and can slide back and forth. The front end of the connecting bracket 13 is provided with a mounting hole 1301 corresponding to the sliding mounting groove 201 on the housing 2 for mounting the side firing button 14. When the side firing button 14 is pushed forward, the connecting bracket 13 slides forward, the tail end of the connecting bracket 13 is clamped in the rear firing button 12, and the rear firing button 12 can be driven to slide forward, so that the firing action is finished.

The safety mechanism E comprises an unlocking button 15, an unlocking limiting block 16 and an unlocking spring 17.

The unlocking button 15 is arranged between the right shell 1 and the left shell 2, wherein one side close to the right shell 1 is a head, one side close to the left shell 2 is a tail, the upper end of the unlocking button 15 is provided with an unlocking baffle 1501, and the lower end of the unlocking button is provided with a locking buckle position 1502 and an unlocking buckle position 1503 which are adjacently arranged. The tail of the unlocking button 15 extends out of a hole in the left shell 2, the head of the unlocking button is sleeved in the unlocking spring 17, and the other end of the unlocking spring 17 is attached to the inner wall of the right shell 1 to provide pretightening force for the unlocking button 15.

The unlocking limiting block 16 is installed in the shell component A, the front end of the unlocking limiting block is connected to the inner needle tube seat 6 and can slide back and forth along with the inner needle tube component B2, and the rear end of the unlocking limiting block is a free end. When the inner needle tube assembly B2 is moved to the tightened position and snapped in, the rear end of the unlocking stop 16 enters the detent 1502 of the unlocking button 15.

The unlock button 15 has a locked state and an unlocked state. The unlocking button 15 is kept in a locking state under the action of the pre-tightening force of the unlocking spring 17 when not pressed by an external force, at the moment, an unlocking baffle 1501 on the unlocking button 15 is positioned on a path, required by the emission of the back firing button 12, for preventing the back firing button 12 from moving forwards, and the unlocking baffle 1501 is positioned at a position for preventing the back firing button 12 from emitting a component to be emitted, so that the back firing button 12 cannot be fired at the moment.

When the unlocking button 15 is pushed, on the one hand the unlocking spring 17 is compressed, and on the other hand an external force urges the unlocking button 15 to move in the direction of its head against the spring force of the unlocking spring 17. The locking button position 1502 is provided with an inclined plane, the tail end of the unlocking limiting block 16 is provided with a corresponding stress-deformable inclined plane, and the locking button position 1502 extrudes the stress-deformable inclined plane at the tail end of the unlocking limiting block 16 through the inclined plane in the movement process of the unlocking button 15, so that the tail end of the unlocking limiting block 16 is deformed under stress, and the locking button position 1502 passes through the tail end of the unlocking limiting block 16 at an open position. When the unlocking button position 1503 behind the locking button position 1502 moves to the tail end of the unlocking limiting block 16, the tail end of the unlocking limiting block 16 enters the unlocking button position 1503 of the unlocking button 15 to form a buckle to limit the unlocking button 15, so that the unlocking button 15 is kept in an unlocking state and cannot be automatically restored to a locking state. At this time, the unlocking baffle 1501 on the unlocking button 15 moves along with the unlocking button 15 and exits from the position where the rear firing button 12 is prevented from firing the to-be-fired component, that is, the limiting effect of the unlocking baffle 1501 on the unlocking button 15 on the forward movement of the rear firing button 12 is released.

The positioning mechanism F includes a positioner 18 and a housing assembly a. The positioner 18 is arranged in the shell component A, and the front end of the positioner 18 is of a cantilever structure and can be deformed under stress. The cantilever is provided with a positioning plane 1801 and a positioning inclined plane 1802, and the positioning plane 1801 and the positioning inclined plane 1802 can be matched with planes and inclined planes on a first limit 122-1, a second limit 122-2 and a third limit 122-3 which are formed by the shell component A to form positioning distances with different lengths. The rear end of the locator 18 is used for being attached to the inner needle seat 6 after being launched, and when the inner needle seat 6 moves to the position of the locator 18 after being launched, the length of the forward movement of the inner needle seat 6 is limited, so that the puncture sampling depth is controlled.

The limiting plane on the housing assembly a cooperates with the locating plane 1801 on the locator arm to contact and limit the forward movement of the locator 18. The limit ramps on the housing assembly a cooperate with the detent ramps 1802 on the detent arms to limit the rearward movement of the detent 18. When the cantilever of the locator 18 is deformed under the action of an upward external force, the matching between the plane and the inclined plane is released, and the locator 18 can be operated to move among three limit positions, so that the adjustment of different puncture sampling depths is completed.

The working process and principle of the embodiment are as follows:

and the tightening button is pulled backwards, the tightening button drives the outer needle tube component to move backwards firstly, and at the moment, the clamping tongue at the tip end of the outer needle tube begins to withdraw from the notch at the tip end of the inner needle tube. When the outer needle tube seat is attached to the inner needle tube seat, the rear end of the tightening button is also attached to the inner needle tube seat, the clamping tongue is completely withdrawn, and the tip end of the inner needle tube becomes unobstructed.

And the tightening button is continuously pulled backwards, the inner needle tube assembly drives the outer needle tube assembly and the unlocking limiting block to move backwards together and compress the launching spring until the clamping hook at the tail end of the inner needle tube seat is buckled with the buckling baffle in the shell assembly. At this time, the sharp end of the needle core extends out of the sharp end of the inner needle tube, and the puncture action can be carried out. The tightening button is released and returns to the initial position under the action of the return spring.

And (4) puncturing by using a biopsy needle, and after the sampling position is determined, pressing an unlocking button rightwards until the unlocking button is limited and cannot be bounced again. The back trigger button is pressed forward (or the side trigger button is pushed forward, the connecting support drives the back trigger button to move forward), the back trigger button moves forward to enable the buckle at the tail end of the inner needle tube seat to be knocked off the buckle from the buckle baffle in the shell component, the inner needle tube component drives the outer needle tube component and the unlocking limiting block to move forward together quickly under the action of the spring, the front end of the inner needle tube carries out quick cutting on tissues, and the tissues are ensured to enter the inner needle tube.

When the inner needle tube seat impacts the positioner, the inner needle tube assembly and the unlocking limiting block stop moving, and the outer needle tube assembly continues to move forwards under the action of inertia. When the outer needle tube base reaches the foremost end, the clamping tongue at the tip of the outer needle tube is inserted into the inner needle tube from the notch at the tip of the inner needle tube again, and the clamping tongue finishes the cutting action on the root of the soft tissue.

And pulling out the biopsy needle, repeatedly pulling the tightening button backwards, slowly pulling out the sampled tissue from the inner needle tube, and finishing the biopsy sampling operation.

Although the present invention has been described in terms of the preferred embodiment, it is not intended that the utility model be limited to the embodiment. Terms such as up, down, left, right, and the like in the embodiments are used only for indicating relative relationships. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the utility model should therefore be determined with reference to the appended claims.

Claims (10)

1. A handle with self-locking function is composed of a casing, a part to be launched, a fastening unit with a free end and a launching unit in the casing, a launching unit with a launching unit and a safety unit consisting of an unlocking button with a unlocking stop plate, a locking button and a pre-fastening unit, an unlocking stop block with a free end and a locking button, and a locking unit with a pre-fastening unit, the free end of the unlocking limiting block moves to the locking buckle position, when the unlocking button is pressed by external force, the locking buckle position extrudes the free end of the unlocking limiting block to enable the free end of the unlocking limiting block to let the locking buckle position open, so that the unlocking buckle position behind the locking buckle position and the free end of the unlocking limiting block are clamped and limited to keep the unlocking button in an unlocking state, and the unlocking baffle is located at a position for preventing the transmitting mechanism from transmitting the part to be transmitted when the unlocking button is in the locking state and is withdrawn from the position for preventing the transmitting mechanism from transmitting the part to be transmitted when the unlocking button is in the unlocking state.

2. The self-locking handle according to claim 1 wherein the pre-tensioning means is an unlocking spring acting on an unlocking button.

3. The handle with self-locking of claim 2, wherein the locking position has an inclined surface, the free end of the unlocking limiting block has a corresponding force-deformable inclined surface, and the locking position presses the force-deformable inclined surface of the free end of the unlocking limiting block through the inclined surface of the locking position.

4. The handle with self-locking of claim 3, wherein the firing mechanism has a first firing button that acts on the component to be fired tightened in the tightened position to fire the component, and the unlocking shutter is positioned to block the first firing button from firing the component to be fired when the unlocking button is in the locked state and to exit the position to block the first firing button from firing the component to be fired when the unlocking button is in the unlocked state.

5. The handle with self-locking of claim 4, wherein the housing has a fastener in the fastening position, the component to be fired is fastened by being fastened to the fastener, and the first firing button acts on the component to be fired to cause the component to be fired to be released from the fastener and fire the component.

6. The self-locking handle according to claim 5 wherein the firing mechanism has a second firing button which, through a connection with the first firing button, causes the first firing button to fire the part to be fired.

7. A biopsy needle comprising a self-locking handle according to any of claims 1-6, it is characterized by also comprising a needle body component, the needle body component comprises an outer needle tube, an outer needle tube seat, an inner needle tube seat, a needle core and a needle core seat, the outer needle tube seat, the inner needle tube seat and the needle core seat are all arranged in the shell, wherein the inner needle tube seat is a part to be launched, the tail end of the outer needle tube is fixed on the outer needle tube seat, a passage is formed in the outer needle tube seat, the inner needle tube penetrates through the passage formed by the outer needle tube and the outer needle tube seat, the tail end of the inner needle tube is fixed on the inner needle tube seat, and a passage is formed in the inner needle tube seat, the tail end of the needle core is fixed on the needle core seat, the needle core penetrates through the passage formed by the inner needle tube and the inner needle tube seat, the tip end of the outer needle tube is provided with a section of clamping tongue bent towards the axis, the tip end of the inner needle tube is provided with a multi-surface edge, a notch is arranged on the side wall close to the needle tip, and the tip end of the needle core is provided with a multi-surface edge.

8. The biopsy needle of claim 7, wherein the rear end of the outer needle hub is provided with a fixed position-limiting buckle, the two sides of the fixed position-limiting buckle are provided with movable position-limiting buckles, the front end of the inner needle hub is correspondingly provided with a fixed position-limiting groove, the two sides of the fixed position-limiting groove are provided with movable position-limiting grooves, the movable position-limiting groove is provided with a first buckling position and a second buckling position, the fixed position-limiting buckle corresponds to the fixed position-limiting groove, the movable position-limiting buckle corresponds to the movable position-limiting groove, the first buckling position and the second buckling position form two positions where the movable position-limiting buckle is buckled in the movable position-limiting groove, the outer needle hub and the inner needle hub are connected with the position-limiting grooves through the position-limiting buckles, the two can slide in a limited manner within a distance X, and the size of the distance X is equal to the distance between the first buckling position and the second buckling position.

9. The biopsy needle of claim 8, wherein the two movable stoppers of the outer needle holder are further provided with a sliding pillar, the tightening mechanism is provided with a sliding slope and a sliding stopper, the sliding slope can act on the sliding pillar to spread the movable stoppers and separate the movable stoppers from the first buckling position, and the sliding stopper can drive the outer needle holder to slide on the inner needle holder after the movable stoppers separate from the first buckling position to move the two movable stoppers of the outer needle holder to the second buckling position.

10. The biopsy needle of claim 9, further comprising a positioning mechanism, wherein the positioning mechanism comprises a locator, and a plurality of limiting structures are arranged in the housing and cooperate with the locator to form positioning distances with different lengths, so that when the inner needle holder moves to the position of the locator after being launched, the limit on the launching distance of the inner needle holder is formed.

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