CN115399814A - Electric tube cutting needle and excitation stopping structure thereof - Google Patents

Abstract

The invention discloses an electric tube cutting needle and an excitation stopping structure thereof, wherein the electric tube cutting needle comprises a tube cutting needle assembly and a shell, the tube cutting needle assembly comprises an inner needle, an outer needle and a cutting needle, and the inner needle, the outer needle and the cutting needle are respectively connected with an inner needle seat, an outer needle seat and a cutting needle seat which are arranged in the shell; the cutting needle seat and the outer needle seat are arranged on a straight line parallel to the needle inserting direction in sequence from near to far away from the needle outlet end; the excitation stopping structure comprises a gear shifting block arranged on the shell; after the tube cutting needle is excited, the outer needle seat and the cutting needle seat sequentially impact corresponding parts of the gear shifting block to stop, so that the positions of the outer needle seat and the cutting needle seat after excitation are determined; the cutting needle seat is close to one side of the gear shifting block and extends to the gear shifting block to form an extending part; the extension part is used for impacting the gear shifting block to stop the cutting needle seat. The excitation stopping structure of the electric tube cutting needle enables the electric tube cutting needle to be stable when stopping after being excited, and reduces shaking.

Description

Electric tube cutting needle and excitation stopping structure thereof

Technical Field

The invention relates to the technical field of medical instruments, in particular to an electric tube cutting needle and an excitation stopping structure thereof.

Background

The puncture biopsy is a main method for obtaining pathological diagnosis of tissues of bone and soft tissue tumors, and a puncture biopsy needle is generally used in cooperation with a puncture frame under the guidance of ultrasonic waves; the ultrasonic image is used as visual guide to help a doctor to insert the biopsy needle near the tumor tissue to be sampled, and then the biopsy needle is excited to take the tissue from the tumor; the puncture carriage may help the physician to keep the biopsy needle in the ultrasound plane so that the biopsy needle is always displayed in line on the ultrasound image. The puncture biopsy operation is divided into lateral cutting and tube cutting, the tube cutting is to directly cut off and take out the tissues in the outer needle, and compared with the biopsy needle of lateral cutting, the tube cutting needle can take out fuller tissues.

The tube-cutting puncture biopsy needle comprises an inner needle, an outer needle and a cutting needle, wherein the inner needle, the outer needle and the cutting needle are sequentially and coaxially sleeved from inside to outside. The tube cutting principle of the puncture biopsy is as follows: 1. the needle point of the inner needle penetrates into the tissue; 2. exciting an outer needle and a cutting needle, wherein the needle end of the outer needle is in front, the needle end of the cutting needle is in back, the outer needle extends out of the needle point of the inner needle, and the outer needle cuts into the tissue through a cutting edge, and the tissue enters the outer needle at the moment; 3. after the outer needle stops, the cutting needle continues to move forwards, and an elastic cutting piece on the tip of the cutting needle extends into the outer needle from a through hole at the position of the outer needle close to the tip to cut off tissues in the outer needle; 4. finally, the inner needle, the outer needle and the cutting needle of the tube cutter are pulled out of the body, the cutting needle is retreated, and then the tissue in the outer needle is pushed out through the inner needle.

The following problems exist in the prior art:

1. manual winding is laborious and therefore requires some additional labour-saving structure in the biopsy needle, which results in a reduced stability of the biopsy needle.

2. When a doctor operates the prostate biopsy operation, the excitation needs to be carried out for 6-12 times, and when a plurality of biopsy operations are continuously carried out, the physical strength of the doctor is consumed by continuous winding, so that the hand is tired, and the operation is influenced.

3. Meanwhile, the tube cutting mode needs three needles, and the three needle bases in the prior art are complex in structure, so that the problem of poor stability is further caused.

Disclosure of Invention

In view of this, the invention provides an excitation stopping structure of an electric tube cutting needle, so that the electric tube cutting needle is stable when stopped after being excited, and the jitter is reduced.

The invention adopts the following technical scheme: the excitation stopping structure of the electric tube cutting needle comprises a tube cutting needle assembly and a shell, wherein the tube cutting needle assembly comprises an inner needle, an outer needle and a cutting needle, and the inner needle, the outer needle and the cutting needle are respectively connected with an inner needle seat, an outer needle seat and a cutting needle seat which are arranged in the shell; the cutting needle seat and the outer needle seat are arranged on a straight line parallel to the needle inserting direction in sequence from near to far away from the needle outlet end; the excitation stopping structure comprises a gear shifting block arranged on the shell; after the tube cutting needle is excited, the outer needle seat and the cutting needle seat sequentially impact corresponding parts of the gear shifting block to stop, so that the positions of the outer needle seat and the cutting needle seat after excitation are determined; the cutting needle seat is close to one side of the gear shifting block and extends to the gear shifting block to form an extending part; the extension part is used for impacting the gear shifting block to stop the movement of the cutting needle seat.

Optionally, a groove extending along the needle inserting direction is arranged in the middle of the gear shifting block, which is close to one side of the needle cutting seat and perpendicular to the needle inserting direction; the size of the extension part corresponds to that of the groove; one end of the groove in the needle inserting direction is closed, and the opposite end of the needle inserting direction is provided with a sliding inlet of the extending part.

Optionally, the extending part is positioned on the opposite side of the needle inserting direction of the cutting needle seat.

Optionally, a sliding groove extending along the needle insertion direction is arranged in the middle of the gear shifting block close to one side of the outer needle seat and perpendicular to the needle insertion direction, and a rectangular boss capable of sliding along the sliding groove is arranged on one side of the outer needle seat close to the gear shifting block; and a blocking wall is arranged on one side of the rectangular boss on the outer needle seat, which is opposite to the needle inserting direction.

Optionally, the afterbody of rectangle boss is equipped with shock-absorbing structure, shock-absorbing structure is used for the reduction shake when keeping off the wall and the spout both sides wall striking of gear shifting piece.

Optionally, the shock-absorbing structure is an arc angle arranged at a connecting part of the side surface of the rectangular boss and the blocking wall.

Optionally, the groove is located at the bottom of the sliding groove on the opposite side of the needle inserting direction.

Optionally, a boss capable of sliding along the sliding groove is arranged on one side of the cutting needle seat close to the gear shifting block.

And the electric tube cutting needle is provided with the excitation stopping structure.

According to the technical scheme of the invention, the excitation stopping structure of the electric tube cutting needle comprises a gear shifting block arranged on a shell; after the tube cutting needle is excited, the outer needle seat and the cutting needle seat sequentially impact corresponding parts of the gear shifting block to stop, so that the positions of the outer needle seat and the cutting needle seat after being excited are determined; the cutting needle seat is close to one side of the gear shifting block and extends to the gear shifting block to form an extending part, and the extending part is used for impacting the gear shifting block to stop the cutting needle seat. According to the invention, the extension part of the cutting needle seat impacts the gear adjusting block, so that the cutting needle seat is prevented from impacting weak parts such as the stop hook and the like.

Drawings

For purposes of illustration and not limitation, the present invention will now be described in accordance with its preferred embodiments, particularly with reference to the accompanying drawings, in which:

FIGS. 1A and 1B are schematic views showing an external structure of a power operated tube cutting needle according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a housing with an internal structure at one side of the housing of the electric tube cutting needle according to the embodiment of the present invention;

FIG. 3 is a schematic structural view of the interior of the housing of the motorized tube cutting needle in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural view of a motor drive mechanism of the electric tube cutting needle according to the embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a lead screw metal encapsulated structure according to an embodiment of the invention;

FIG. 6 is an exploded view of a lead screw metal encapsulated structure according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of the assembly of the upper chord slide block, the cutting needle seat and the gear shifting block of the embodiment of the invention;

FIG. 8 is a schematic view of an electric tube cutting needle beginning to wind up in accordance with an embodiment of the present invention;

FIG. 9 is a schematic view of an embodiment of the present invention upon completion of the winding of the electrical pipe cutting needle;

FIG. 10 is an exploded view of the upper chord slider, the cutting needle mount, and the shift block mounting assembly of an embodiment of the present invention from one perspective;

FIG. 11 is an exploded view of the upper chord slider, the cutting needle mount, and the shift block mounting body of an embodiment of the present invention from another perspective;

FIG. 12 is an exploded view of the upper chord slider, the cutting needle mount, the trigger link, and the shift block assembly of the embodiment of the present invention;

FIG. 13 is a rear view of FIG. 12;

FIG. 14 is a schematic structural view of a trigger link according to an embodiment of the present invention;

FIG. 15 is a schematic view of an embodiment of the present invention after activation of the motorized tube cutting needle;

FIG. 16 is a schematic structural diagram of a shift block according to an embodiment of the present invention;

FIG. 17 is a schematic structural view of the upper chord slide block, the cutting needle seat and the outer needle seat of the embodiment of the invention on the slide rail;

FIG. 18 is a schematic view of the structure of the slide rail on the housing of the embodiment of the present invention;

FIG. 19 is a schematic structural view from another perspective of a slide rail on a housing according to an embodiment of the present invention;

FIG. 20 is a view of the position of the cutting hub and outer hub after activation;

FIG. 21 is a positional view of the cutting hub and outer hub after chordal application;

FIG. 22 is a schematic view of the connection of the gearshift knob to the housing;

FIG. 23 is a schematic view of the connection portion of the housing and the shift block;

FIG. 24 is a schematic view of another view of the gearshift block;

FIG. 25 is a top view of the shift block coupled to the outer hub;

FIG. 26 is a perspective view of the shift block coupled to the outer needle mount;

fig. 27 is a perspective view of the shift block connected to the outer needle hub from another perspective.

In the figure:

1: a winding slider; 2: cutting off the needle seat; 3: a gear shifting block; 4: an outer needle base; 5: triggering a connecting rod; 6: a screw rod; 7: a motor; 8: an upper housing; 9: a lower housing; 10: a circuit board;

81-battery; 82: an indicator light; 83: a winding button; 84: a display aperture; 85: a spring; 86: a first track; 87: a second track; 88: a first bearing; 89: a second bearing; 90: an inner needle seat; 91: a front contact switch; 92: a rear contact switch; 93: an indication window; 94: a long through hole; 95: a trapezoidal clamping groove;

11: a first protrusion; 12: connecting holes; 13: a first longitudinal slot; 14: a circular tubular structure; 15: pressing the inclined plane downwards; 16: a bottom edge;

21: a second protrusion; 211: unlocking the inclined plane; 22: a second longitudinal slot; 23: cutting off the latch hook of the needle seat; 24: an extension portion;

31: a retaining wall; 311: a gear shifting block latch hook; 32: a chute; 33: a catch hook; 331: a hook stop slope; 332: the top end face of the stop hook; 34: a pressing part; 35: a connecting wall; 36: a second push button; 37: a notch; 38; a trapezoidal protrusion; 39: the gear shifting block is convex; 40: a groove;

41: a circular arc angle;

51: a trigger button; 52: a first push button;

61: a plastic screw rod; 62; a metal shaft;

71: a rotating shaft.

Detailed Description

FIGS. 1A and 1B are schematic views showing an external structure of a power operated tube cutting needle according to an embodiment of the present invention; as shown in fig. 1A and 1B, the electric tube cutting needle includes upper and lower cases 8 and 9 and a puncture needle assembly (including an inner needle, an outer needle, and a puncture needle); the shell is provided with a trigger button 51 and a first push button 52 for the excitation of the puncture needle, and a second push button 36 for the excitation and gear shifting of the puncture needle; the abutting surface of the upper shell 8 and the lower shell 9 is provided with a display hole 84 and an upper chord button 83 for upper chord.

FIG. 2 is an overall internal layout view of an electric tube cutting needle including a motor drive mechanism, a winding up, excitation mechanism, etc. in accordance with an embodiment of the present invention; the motor drive, winding and excitation mechanisms are all located inside the housing, and the lower housing 9 is visible in fig. 2, and the upper housing is omitted. The motor driving mechanism comprises a motor 7, a screw rod 6, a front contact switch 91, a rear contact switch 92, a battery 81, a winding button 83 and an indicator lamp 82, and the display hole 84 is positioned on the shell outside the indicator lamp 82; the winding and exciting mechanism comprises a winding slider 1, a cutting needle base 2, an outer needle base 4, a gear shifting block 3, an inner needle base 90 and a spring 85. The spring 85 is arranged between the outer needle hub 4 and the inner needle hub 90, the inner needle hub 90 being fixed to the housing. The motor driving mechanism drives the winding and exciting mechanism to realize winding, exciting and resetting functions. The following describes embodiments of the present invention.

FIGS. 3 and 4 show the internal structure of the electric tube cutting needle according to the embodiment of the present invention; fig. 3 and 4 are illustrated from different angles and the trigger link 5 is omitted from fig. 4 for clarity of illustration. The electric tube cutting needle provided by the embodiment of the invention is driven to wind up through the motor, so that the operation is more labor-saving. A motor 7 of the motor driving mechanism drives a screw rod 6, the screw rod 6 penetrates through a threaded hole in the inner surface of a round tubular structure 14 on one side, far away from the cutting needle seat 2, of the upper string sliding block 1, so that the upper string sliding block 1 can be driven to slide back and forth along a track located on the inner side of the shell, and the front-back sliding direction is parallel to the needle inserting direction during puncture operation. Fig. 3 and 4 show two winding sliders 1, showing the positions of the two end points of their sliding, the actual structure is still as shown in fig. 2, and only 1 winding slider 1 is provided.

The upper string sliding block 1 drives the cutting needle seat 2 of the electric tube cutting needle to move, and the cutting needle seat 2 can push the outer needle seat 4 when moving.

The cutting needle seat 2, the upper chord slider 1 and the circuit board 10 are sequentially arranged in parallel in a direction vertical to the needle insertion direction, a front contact switch 91 and a rear contact switch 92 are arranged on one side of the circuit board 10 close to the upper chord slider 1, and the first bulge 11 on the circular tubular structure 14 respectively touches the front contact switch 91 and the rear contact switch 92 when the upper chord slider 1 moves back and forth, so that the two switches are actuated; the circuit board 10 is provided with a winding button 83 and an indicator 82, and the indicator 82 is used for displaying the working state of the battery 81 or the connection state with the power supply. As shown in fig. 2, a winding button 83 extends from the housing. The motor 7 is connected with a battery 81, and the motor 7 can also be connected with an external low-voltage direct-current power supply.

The front contact switch 91 and the rear contact switch 92 are used for judging the position of the upper string sliding block 1, and other position sensing components can be selected as the contact switches.

In the embodiment of the invention, for example, when the winding slider 1 is in the initial position, the first protrusion 11 abuts against the rear contact switch 92, when the winding button 83 is pressed, the motor 7 rotates to drive the screw rod 6 to rotate, the winding slider 1 is pushed forward (this is a reset process), after the first protrusion 11 on the surface of the winding slider 1 contacts the front contact switch 91, the motor 7 rotates in the reverse direction, and the winding slider 1 is pushed backward (this is a winding process) through the transmission of the screw rod 6 until the motor 7 stops after the first protrusion 11 contacts the rear contact switch 92. The motor 7 is operated by the action of the front contact switch 91 and the rear contact switch 92, so that the upper string sliding block 1 moves back and forth, and the action of resetting the upper string is realized.

In the embodiment of the invention, before the winding button 83 is pressed and the winding slider 1 is moved back and forth to reset, the cutting needle seat 2 and the outer needle seat 4 are reset after being excited by the thrust of the elastic force of the spring; when winding, the winding sliding block 1 is buckled with the cutting needle seat 2, and the winding sliding block 1 drives the cutting needle seat 2 to move backwards; the position of the front contact switch 91 is arranged such that the winding runner 1 can be moved to a reset position.

Fig. 4 shows two states of the upper string slider, namely, the first state of the upper string slider 1 at the rear position and the second state at the front position. Pressing the winding button 83, the winding slider 1 goes from the first state to the second state to the first state, and then waits for the triggering operation.

As shown in fig. 5 and 6, the screw rod 6 includes a hollow plastic screw rod 61 and a metal shaft 62 filled in the middle of the plastic screw rod 61, and the metal shaft 62 is used for increasing strength.

The metal shaft 62 extends out from the first end of the plastic screw rod 61, the extending end is provided with a first bearing 88 fixedly arranged on the shell, the second end of the plastic screw rod 61 is sleeved on the rotating shaft 71 of the motor 7, the second end of the screw rod 6 is provided with a second bearing 89 fixedly arranged on the shell, and the second bearing 89 can also be arranged on the rotating shaft 71 of the motor 7; the screw rod 6 is rotatably arranged on the shell through two bearings, so that the accuracy is guaranteed.

The bearing can be independently arranged at the end, far away from the motor, of the screw rod, the bearing is not arranged at the end connected with the motor, but the force of the screw rod, close to one end of the motor, is borne by the motor completely, and the coaxiality of the screw rod can be influenced.

In the embodiment of the invention, the bearings are respectively arranged on the metal shaft far away from the motor end and the rotating shaft of the motor, so that the connection between the rotating shaft made of metal and the bearings can be realized.

The first step of the winding and exciting resetting operation is winding; referring to fig. 7, 8 and 9, fig. 7 is a schematic structural view of the assembly of an upper chord sliding block 1, a cutting needle seat 2 and a gear shifting block 3 according to the embodiment of the present invention, in fig. 7, the upper chord sliding block 1 drives the cutting needle seat 2 and the gear shifting block 3 to be connected together, and in fig. 7, two upper chord sliding blocks 1 are seen, which are the same as fig. 3 and 4 and represent two positions of one upper chord sliding block 1; FIG. 8 shows a state when the winding is started, in which the winding slider 1, the cutting pin holder 2, and the outer pin holder 4 are moved together in the reverse direction of the needle insertion direction, except for the shift block 3; fig. 9 is a state when the winding is completed.

Referring to fig. 10 and 11, fig. 10 and 11 are exploded views of an assembly of the upper chord slider 1, the cutting needle base 2 and the gear shift block 3 according to the embodiment of the present invention from different viewing angles. The upper string sliding block 1 is connected with the cutting needle seat 2 in a buckling mode, a second bulge 21 is arranged at the upper front end of the connecting surface of the cutting needle seat 2 and the upper string sliding block 1, and the upper string sliding block 1 is provided with a corresponding connecting hole 12; the second bulge 21 extends into the connecting hole 12 to realize buckling, and the upper chord sliding block 1 drives the cutting needle base 2 to move reversely to the needle inserting direction; the connecting hole 12 can be a through hole or a blind hole, and is a through hole in fig. 10; in fig. 10, the front side surface of the second projection 21 is a vertical surface, the rear side surface is an inclined surface inclined outward, and the inclined surface is an unlocking inclined surface 211.

The connecting hole 12 on the upper chord sliding block 1 hooks the second bulge 21 on the cutting needle base 2 to move reversely to the needle inserting direction. Referring to fig. 7 to 9, the cutting needle holder 2 abuts against the outer needle holder 4 and then slides in the opposite direction of the needle insertion direction, and the spring 85 between the outer needle holder 4 and the inner needle holder 90 is compressed to store energy. And when the winding-up sliding block 1 moves to a specified position, the locking is still realized, and the winding-up action is completed.

The second step of the operation is the excitation. Fig. 12 and 13 show the position of the trigger link 5, and fig. 14 is a schematic structural view of the trigger link according to the embodiment of the present invention. In fig. 12, the trigger link 5 moves in the needle insertion direction, and the end moves along the slope-shaped surface of the unlocking slant 211 to push the upper string slider 1 and the cutting needle holder 2 open.

With reference to fig. 11, a first longitudinal groove 13 is formed at the connecting portion of the upper chord sliding block 1 and the cutting needle seat 2 in fig. 11, and with reference to fig. 10, a second longitudinal groove 22 is formed in the middle of the right side of the unlocking inclined plane 211 on the cutting needle seat 2 in fig. 10, and one end of the trigger connecting rod 5 in the needle inserting direction is located in the second longitudinal groove 22; the first longitudinal groove 13 is opposite to the second longitudinal groove 22, and the groove wall of the second longitudinal groove 22 is positioned in the first longitudinal groove 13; in fig. 12, in the initial state, the front end of the trigger link 5 is located at the rear end of the second longitudinal groove 22, at a distance from the second projection 21; referring to fig. 1, a trigger button 51 at the rear end of a trigger connecting rod 5 is pressed or a first push button 52 connected with the trigger connecting rod 5 and arranged in the middle of a shell is pushed, the trigger connecting rod 5 is pushed towards the needle inserting direction, and a connecting hole 12 on an upper chord sliding block 1 and a second bulge 21 on a cutting needle seat 2 are separated from each other through an unlocking inclined plane 211; after the spring 85 between the outer needle base 4 and the inner needle base 90 is released, the outer needle base 4 and the cutting needle base 2 are pushed to move together in the needle inserting direction; at this time, the outer needle and the cutting needle move simultaneously in the needle insertion direction, and under the condition of the biopsy operation, the outer needle extends out of the needle point of the inner needle, cuts into the tissue through the cutting edge, and the tissue enters the outer needle. The outer needle seat 4 moves towards the needle inserting direction, stops after impacting the rear side part of the gear shifting block 3, the cutting needle seat 2 continues to move for a certain distance towards the needle inserting direction under the action of inertia after the outer needle seat 4 stops, stops after impacting the gear shifting block 3, and is locked by a lock hook structure (the lock hook structure comprises a cutting needle seat lock hook 23 and a gear shifting block lock hook 311) between the cutting needle seat and the gear shifting block. At this time, an elastic cutting piece at the tip of the cutting needle extends into the outer needle from a through hole at a position of the outer needle near the tip, and cuts the tissue in the outer needle.

The state after the electric tube cutting needle is excited is shown in fig. 15; in fig. 15, the gear shifting block 3 is sleeved at the bottoms of the cutting needle seat 2 and the outer needle seat 4; referring to fig. 16, the left and right sides of the top of the shift block 3 are respectively provided with a blocking wall 31 parallel to the needle insertion direction, and a sliding groove 32 is formed between the blocking walls 31. In fig. 15, the cutting needle base 2 and the outer needle base 4 are provided with corresponding rectangular bosses at the bottom, and the rectangular bosses can move in the sliding groove 32; the front end of the bottom of the upper chord sliding block 1 is provided with a downward pressing inclined plane 15, the front end of the blocking wall 31 of the gear shifting block 3 is bent upwards to form a blocking hook 33 vertical to the needle inserting direction, and one side of the end part of the blocking hook 33 far away from the needle inserting direction is provided with a blocking hook inclined plane 331 corresponding to the downward pressing inclined plane 15; a shift block locking hook 311 extending upwards is arranged on the blocking wall 31 close to the blocking hook 33, the side surface of one side of the shift block locking hook 311 in the needle inserting direction is a vertical surface, the other side of the shift block locking hook 311 is an inclined surface inclining outwards, a cutting needle seat locking hook 23 extending towards the shift block 3 is arranged at the corresponding position on the cutting needle seat 2, the side surface of one side of the needle inserting direction of the cutting needle seat locking hook 23 is an inclined surface inclining outwards, and the side surface of the other side is a vertical surface; before the stop hook 33 is pressed down, the locking hook 23 of the cutting needle seat and the locking hook 311 of the gear shifting block are positioned on a straight line parallel to the needle inserting direction so that the two hooks each other.

In fig. 15, the upper string sliding block 1 moves in the needle insertion direction, the shift block 3 is pressed in the direction away from the upper string sliding block 1 (i.e., downward in fig. 15) by the downward pressing slope 15 of the upper string sliding block 1, and the shift block locking hook 311 and the cutting needle holder locking hook 23 are disengaged from each other, and the state shown in fig. 8 is assumed; after the upper chord sliding block 1 continues to move towards the needle inserting direction, the locking hook between the cutting needle seat 2 and the gear shifting block 4 is kept in a disengaged state all the time; when the winding slider 1 continues to move to the needle inserting direction and reaches the front trigger switch 91, the winding action is repeated: the connecting hole 12 on the upper chord sliding block 1 hooks the first bulge 21 on the cutting needle seat 2 to move reversely to the needle inserting direction, at the moment, the cutting piece is separated from the through hole at the position of the outer needle close to the needle point, the cutting needle seat 2 moves to be abutted to the outer needle seat 4 and then slides reversely to the needle inserting direction, the spring 85 between the outer needle seat 4 and the inner needle seat 90 is compressed to store energy, at the moment, the inner needle extends out of the outer needle, and if tissues are taken in the outer needle, the inner needle can push out the taken tissues.

It should be noted that, in fig. 2-4 and 7, the state of the shift block locking hook 311, the cutting needle holder locking hook 23, the downward pressing inclined surface 15, and the blocking hook inclined surface 331 should be as shown in fig. 8, that is, the top end surface 332 of the blocking hook 33 abuts against the bottom edge 16 of the upper string slider 1, so that the shift block locking hook 311 and the cutting needle holder locking hook 23 are kept in the disengaged state.

When the upper string sliding block 1 moves to the designated position, the locking is still, the upper string movement is completed, and the next biopsy excitation movement can be carried out.

The structure of the winding and exciting mechanism is introduced, and the working process of winding and exciting resetting is as follows:

when the winding starts, the cutting needle seat 2 and the outer needle seat 4 are in an excited state, and the winding sliding block 1 is located at the first position behind the cutting needle seat; the upper chord button 83 is pressed, the upper chord sliding block 1 moves towards the needle inserting direction, the inclined plane 15 is pressed downwards to press the stop hook 33 towards the direction far away from the upper chord sliding block 1, the locking hook 23 of the cutting needle seat is separated from the locking hook 311 of the gear shifting block, the upper chord sliding block 1 continues to move towards the needle inserting direction, the connecting hole 12 at the end part of the upper chord sliding block 1 is buckled with the second bulge 21 at the end part of the cutting needle seat 2, and the first bulge 11 of the upper chord sliding block 1 is contacted with the front contact switch 91; the upper chord slide block 1 drives the cutting needle base 2 to move reversely in the needle inserting direction; after the cutting needle base 2 touches the outer needle base 4, the upper chord sliding block 1, the cutting needle base 2 and the outer needle base 4 move in the reverse direction of the needle inserting direction together, the first bulge 11 of the upper chord sliding block 1 contacts the rear contact switch 92, the upper chord sliding block 1 stops moving, and the spring 85 between the outer needle base 4 and the inner needle base 90 is compressed.

When the needle is excited, the trigger connecting rod 5 moves towards the needle inserting direction and moves along the slope of the unlocking inclined plane 211 to separate the upper chord sliding block 1 from the cutting needle seat 2, the cutting needle seat 2 and the outer needle seat 4 move towards the needle inserting direction under the elastic action of the spring 85, the outer needle seat 4 stops moving after touching the gear shifting block 3, the cutting needle seat 2 continues to move under the inertia action until touching the gear shifting block 3 to stop, and meanwhile, the cutting needle seat locking hook 23 and the gear shifting block locking hook 311 are mutually buckled together.

The application method of the electric tube cutting needle comprises the following steps: pressing the winding button 83, resetting the winding sliding block 1 to be buckled with the cutting needle seat 2, and driving the cutting needle seat 2 and the outer needle seat 4 to move reversely in the needle inserting direction to finish winding; the trigger connecting rod 5 is pressed, the outer needle seat 4 and the cutting needle seat 2 move towards the needle inserting direction, the outer needle seat 4 and the cutting needle seat 2 are stopped by the gear shifting block 3 in sequence, and excitation is completed.

As shown in fig. 17 to 19, the housing has two parallel rails, the upper string slider 1 is located on the first rail 86, and the cutter needle holder 2 and the outer needle holder 4 are located on the second rail 87.

As shown in fig. 20 and 21, an indication window 93 is provided on the casing of the second rail 87 where the cutting needle holder 2 and the outer needle holder 4 are located, so that a part of the cutting needle holder 2 or the outer needle holder 4 in the rail can be seen, and the winding condition in the casing can be judged by setting the cutting needle holder 2 and the outer needle holder 4 to different colors; fig. 20 is a view of the position of the cutting hub 2 and the outer hub 4 after activation, with the outer hub 4 visible through the indicator window 93; fig. 21 shows the position of the cutting hub 2 and the outer hub 4 after the winding, the cutting hub 2 being visible through the indicator window 93, the winding being completed and being activatable when the cutting hub 2 is visible.

Referring to fig. 22 and 23, fig. 22 is a schematic structural view of the connection between the gearshift block and the housing, and fig. 23 is a schematic structural view of the connection portion between the gearshift block and the housing; in fig. 22, the shift block 3 is extended to form a pressing portion 34 close to one side of the housing in the needle insertion direction, the pressing portion 34 is connected to a second push button 36 arranged outside the housing through a connecting wall 35, the housing is provided with a long through hole 94 for the second push button 36 to move, the pressing portion 34 and the front end of the blocking wall 31 are arranged in an up-and-down manner, and a gap 37 is arranged between the pressing portion 34 and the front end of the blocking wall 31; the pressing portion 34 and the front end of the blocking wall 31 are designed to be elastically deformed more easily, and are easily realized when the second push button 36 is pressed and when the pressing slope 15 presses the shift block 3. Trapezoidal protrusions 38 are respectively arranged on two sides of the connecting wall 35, and a plurality of trapezoidal clamping grooves 95 corresponding to the trapezoidal protrusions 38 in shape and size are longitudinally arranged on two sides of the long through hole 94 on the shell, in this embodiment, three trapezoidal clamping grooves 95 are arranged; when no external force is applied to the second push button 36, the trapezoidal protrusion 38 is just positioned in the trapezoidal clamping groove 95, a force is applied to the second push button 36 toward the inner side of the housing, the trapezoidal protrusion 38 is separated from the trapezoidal clamping groove 95, and the second push button 36 can push the gear shift block 3 to move in parallel to the needle insertion direction; thus, the gear shifting block 3 is slidably disposed on the housing and is positioned by the trapezoidal slot 95. In fig. 22, the side surface of one side of the trapezoidal projection 38 in the needle insertion direction is a vertical surface, and the other side is an inclined surface inclined outward; due to the arrangement of the inclined plane on the side opposite to the needle inserting direction on the trapezoidal protrusion 38, the gear can be shifted by pressing when the gear is shifted in the needle inserting direction without pressing when the gear is shifted in the reverse direction of the needle inserting direction.

The back of the second push button 36 is provided with a shift block bulge 39, and after being activated, the cutting needle base 2 just abuts against the shift block bulge 39, so that the activated biopsy needle cannot be shifted. After winding, the cutting needle base 2 is separated from the position of the shift block bulge 39, and the second push button 36 can be pressed to shift. The shift block bulge 39 is set up to prevent the doctor from operating the shift position by mistake after sampling, which causes the inner needle and the cutting needle to press the tissue in the outer needle, therefore, the shift can be used according to the requirement only after winding.

In the embodiment of the present invention, the gear shifting method of the gear shifting block 3 is: the second push button 36 is pushed in the reverse direction of the needle inserting direction, and the stroke of the cutting needle seat 2 and the stroke of the outer needle seat 4 are shortened; the second push button 36 is pushed down to push the second push button 36 in the needle insertion direction, so that the stroke of the cutting needle holder 2 and the outer needle holder 4 is lengthened.

Fig. 24 is a structural schematic diagram of another view angle of the shift block 3 according to the embodiment of the present invention, and it can be seen that the shift block protrusion 39 is located on the back side of the second push button 36.

After excitation, the outer needle seat 4 and the cutting needle seat 2 stop in a mode of impacting on the gear shifting block 3; referring to fig. 16, a groove 40 is formed in the chute 32 of the connection surface of the gear shifting block 3 with the cutting needle holder 2 and the outer needle holder 4. Referring to fig. 11, the right end of the cutting needle holder 2 near the shift block 3 extends to the shift block 3 to form an extending portion 24, and the size of the extending portion 24 corresponds to the size of the groove 40; after the cutting needle seat 2 is excited, the cutting needle seat 2 moves towards the needle inserting direction, the extending part 24 is positioned in the groove 40, and the extending part 24 collides with the groove wall of the groove 40 to stop, so that the weak parts such as a stop hook of the cutting needle seat 2 are prevented from being collided.

The outer needle base 4 and the cutting needle base 2 are stopped by impacting the gear shifting block 3, referring to fig. 25 to 27, when the outer needle base 4 and the gear shifting block 3 impact, two arc angles 41 are arranged on the outer needle base 4, the arc angles 41 are positioned at the tail part of a rectangular boss 42 of the outer needle base 4 sliding in the sliding groove 32 and are positioned between the side surface of the rectangular boss 42 and a blocking wall 43 of the outer needle base 4; when the outer needle seat 4 slides along the sliding groove 32 of the gear shift block 3, the arc angle 41 firstly impacts the two walls of the sliding groove 32, and the shaking of the outer needle can be reduced through the elastic energy absorption mode that the two walls of the sliding groove 32 expand outwards.

The above-described embodiments should not be construed as limiting the scope of the invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The excitation stopping structure of the electric tube cutting needle comprises a tube cutting needle assembly and a shell, wherein the tube cutting needle assembly comprises an inner needle, an outer needle and a cutting needle, and the inner needle, the outer needle and the cutting needle are respectively connected with an inner needle seat (90), an outer needle seat (4) and a cutting needle seat (2) which are arranged in the shell;

the cutting needle seat (2) and the outer needle seat (4) are positioned on a straight line parallel to the needle inserting direction and are sequentially arranged from near to far away from the needle outlet end;

the device is characterized in that the excitation stopping structure comprises a gear shifting block (3) arranged on the shell;

after the tube cutting needle is excited, the outer needle seat (4) and the cutting needle seat (2) sequentially impact corresponding parts of the gear shifting block (3) to stop, so that the positions of the outer needle seat (4) and the cutting needle seat (2) after excitation are determined;

one side of the cutting needle seat (2) close to the gear shifting block (3) extends to the gear shifting block (3) to form an extension part (24); the extension part (24) is used for impacting the gear shifting block (3) to stop the movement of the cutting needle seat (2).

2. The excitation stop structure of an electric tube cutting needle according to claim 1,

the middle part of the gear shifting block (3), which is close to one side of the cutting needle seat (2) and is vertical to the needle inserting direction, is provided with a groove (40) extending along the needle inserting direction;

the extension (24) has dimensions corresponding to those of the groove (40);

one end of the groove (40) in the needle inserting direction is closed, and the other end in the opposite needle inserting direction is provided with a sliding inlet of the extension part (24).

3. The excitation stop structure of the electric tube cutting needle according to claim 1 or 2, wherein the extension portion (24) is located on the opposite side of the needle insertion direction of the cutting needle holder (2).

4. The excitation stop structure of an electric tube cutting needle according to claim 2,

the needle inserting device is characterized in that the gear shifting block (3) is close to one side of the outer needle seat (4), a sliding groove (32) extending along the needle inserting direction is arranged in the middle part perpendicular to the needle inserting direction, and a rectangular boss (42) capable of sliding along the sliding groove (32) is arranged on one side of the outer needle seat (4) close to the gear shifting block (3);

a blocking wall (43) is arranged on one side of the outer needle base (4) opposite to the needle inserting direction of the rectangular boss (42).

5. The excitation stop structure of the electric tube cutting needle according to claim 4, characterized in that the tail of the rectangular boss (42) is provided with a shock absorbing structure for reducing the shake when the baffle wall (43) collides with the two side walls of the sliding groove (32) of the shift block (3).

6. The excitation stop structure of the electric tube cutting needle according to claim 5, wherein the shock absorbing structure is a circular arc angle (42) provided at a portion where the side surface of the rectangular boss (42) is in contact with the stopper wall (43).

7. The excitation stop structure of the electric tube cutting needle according to claim 6, wherein the groove (40) is located at the bottom of the opposite side of the needle insertion direction of the chute (32).

8. The excitation stop structure of the electric tube cutting needle according to claim 7, characterized in that a boss capable of sliding along the sliding groove (32) is arranged on one side of the cutting needle seat (2) close to the gear shift block (3).

9. An electric tube cutting needle having the excitation stop structure according to any one of claims 1 to 8.

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