CN117159043A - Electric tube cutting needle - Google Patents

Abstract

The invention discloses an electric tube cutting needle which comprises a puncture biopsy needle assembly, a shell, an upper chord sliding block and a gear shifting block; a first track and a second track which are respectively parallel to the needle feeding direction are arranged on the shell of the electric tube cutting needle; the upper chord sliding block is positioned on the first track, and the cutting needle seat, the outer needle seat and the inner needle seat are sequentially arranged on the second track from the near to the far according to the distance from the needle outlet end; the inner needle seat is fixedly connected with the shell, and a spring is arranged between the inner needle seat and the outer needle seat; the gear shifting block is blocked on a travelling path after the outer needle seat and the outer needle seat are excited, and after excitation, the outer needle seat and the gear shifting block are contacted with each other in sequence to stop; the upper chord sliding block can move along the first track under the drive of the motor driving mechanism, so that the cutting needle seat and the outer needle seat are driven to move to the upper chord position in the reverse direction of the needle inserting direction. The invention can drive the winding by the motor, and the operation is more labor-saving; under the condition of multiple excitation, the normal operation is ensured; and meanwhile, the stability of the structure is improved.

Description

Electric tube cutting needle

Technical Field

The invention relates to the technical field of medical instruments, in particular to an electric tube cutting needle.

Background

The puncture biopsy is a main method for acquiring histopathological diagnosis of bone and soft tissue tumors, and the puncture biopsy needle is generally used together with a puncture frame under the guidance of ultrasound; the ultrasonic image is used as a visual guide to help doctors to pierce the biopsy needle near tumor tissues to be sampled, and then the biopsy needle is excited to take off the tissues from the tumor; the puncture frame can help a doctor to keep the biopsy needle in an ultrasonic plane, so that the biopsy needle is always displayed in a linear shape on an ultrasonic image. The biopsy operation is divided into side cutting and tube cutting, the tube cutting directly cuts off tissues in the outer needle, and compared with a biopsy needle with side cutting, the tube cutting needle can be used for taking more filled tissues.

The tube-cut 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 coaxially sleeved in sequence from inside to outside. The tube cutting principle of the puncture biopsy is as follows: 1. the tip of the inner needle penetrates into the tissue; 2. the outer needle and the cutting needle are excited, the needle end of the outer needle is in front, the needle end of the cutting needle is behind, the outer needle extends out of the needle point of the inner needle and cuts into the tissue through the cutting edge, and the tissue enters the outer needle at the moment; 3. after the outer needle stops, the cutting needle continues to move forward, 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 are pulled out of the body, the cutting needle is withdrawn, 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 effort-saving structure to be added inside the biopsy needle, which results in a reduced stability of the biopsy needle.

2. When a doctor operates a prostate biopsy operation, the doctor needs to excite for 6 to 12 times, and when a plurality of biopsy operations are continuously performed, the doctor can consume physical strength continuously to cause hand fatigue and influence the operation.

3. Meanwhile, three needles are needed in a tube cutting mode, and three needle seats in the prior art are complex in structure, so that the problem of poor stability is further brought.

Disclosure of Invention

In view of the above, the invention provides a power-driven tube cutting needle, which is driven to be wound up by a motor, so that the operation is more labor-saving.

The invention adopts the following technical scheme: the electric tube cutting needle comprises a puncture biopsy needle assembly and a shell, wherein the puncture biopsy needle assembly comprises an inner needle, an outer needle and a cutting needle, 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, and the electric tube cutting needle further comprises a winding sliding block and a gear shifting block; the shell is provided with a first track and a second track which are parallel to the needle inserting direction; the upper chord sliding block is positioned on the first track; the cutting needle seat, the outer needle seat and the inner needle seat are sequentially arranged on the second track from the near to the far of the needle outlet end; the inner needle seat is fixedly connected with the shell, and a spring is arranged between the inner needle seat and the outer needle seat; the gear shifting block is blocked on a travelling route after the needle seat is cut off and the outer needle seat is excited; after excitation, the outer needle seat and the cut-off needle seat are contacted with the gear shifting block in sequence to stop; the winding slider can move along the first track under the drive of the motor driving mechanism, so that the cutting needle seat and the outer needle seat are driven to move to the winding position in the reverse direction of the needle inserting direction.

Optionally, the motor driving mechanism includes a motor, a screw, a controller, a position sensing element, a trigger element, wherein: a circular tube-shaped structure is arranged on one side, far away from the cutting needle seat, of the upper chord sliding block, and a threaded hole through which a screw rod passes is formed in the inner surface of the circular tube-shaped structure; the motor is connected with the screw rod; a position sensing element is arranged near the travelling route of the winding slider and is electrically connected with the controller; the trigger element is electrically connected with the controller.

Optionally, the controller is the circuit board, the position sensing component includes preceding contact switch and back contact switch, trigger element is the last string button of locating the casing, wherein: the circuit board is connected to the shell and is parallel to the upper chord sliding block; a front contact switch and a rear contact switch are arranged on one side, close to the upper chord sliding block, of the circuit board; a first protrusion on the tubular structure; when the upper chord sliding block moves to the two ends of the stroke on the first track, the first bulge touches the rear of the front contact switch and the front of the rear contact switch respectively.

Optionally, the motor is connected to a battery provided in the housing, or to an external low voltage dc power supply.

Optionally, the motor driving mechanism further comprises an indicator lamp, wherein the indicator lamp is connected with the controller and is used for displaying the working state of the battery or the connection state with the power supply; and a display hole is formed in the position of the shell where the indicator lamp is located.

Optionally, two ends of the screw rod are respectively positioned on a first bearing and a second bearing fixed on the shell.

Optionally, a second bulge is arranged on the connecting surface of the cutting needle seat and the upper chord sliding block, and the upper chord sliding block is provided with a corresponding connecting hole; when winding, the connection Kong Gouzhu on the winding slider cuts off the reverse movement of the second protrusion on the needle holder in the needle insertion direction.

Optionally, a side surface of one side of the second bulge in the needle inserting direction is a vertical surface, a side surface of the opposite side of the needle inserting direction is an unlocking inclined surface, and the unlocking inclined surface is an inclined surface inclined outwards; the trigger connecting rod is positioned between the upper chord sliding block and the cutting needle seat and is positioned at one side of the unlocking inclined plane far away from the needle entering direction.

Optionally, a trigger button is arranged at the rear end of the trigger connecting rod, and the trigger connecting rod is connected with a first push button arranged in the middle of the shell.

Optionally, a stop hook is arranged at the front end of the gear shifting block, and a downward pressing inclined plane is arranged at the front end of the upper chord sliding block; when the upper chord slide block moves to the needle inserting direction and passes through the blocking hook, the downward pressing inclined surface presses the blocking hook in the direction away from the upper chord slide block, so that the front end of the blocking adjusting block moves in the direction away from the upper chord slide block; the front end of the gear shifting block is provided with a gear shifting block lock hook, and a corresponding position on the cutting needle seat is provided with a cutting needle seat lock hook; before the stop hook is pressed down, the lock hook of the cutting needle seat and the lock hook of the gear shifting block are positioned on a straight line parallel to the needle feeding direction.

Optionally, the side surface of one side of the gear shifting block lock hook in the needle inserting direction is a vertical surface, and the side surface of the opposite side is an inclined surface which is inclined outwards; the side surface of one side of the needle inserting direction of the lock hook of the cutting needle seat is an inclined surface which is inclined outwards, and the side surface of the opposite side is a vertical surface.

According to the technical scheme of the invention, the electric tube cutting needle also comprises an upper chord sliding block and a gear shifting block; the upper chord sliding block is positioned on the first track, and the cutting needle seat, the outer needle seat and the inner needle seat are sequentially arranged on the second track from the near to the far according to the distance from the needle outlet end; the gear shifting block is blocked on a travelling path after the outer needle seat and the outer needle seat are excited, and after excitation, the outer needle seat and the gear shifting block are contacted with each other in sequence to stop; the upper chord sliding block can move on the first track under the drive of the motor driving mechanism, so that the cutting needle seat and the outer needle seat are driven to move to the upper chord position in the reverse direction of the needle inserting direction. The power tube cutting needle can be driven by the motor to wind up, so that the operation is more labor-saving; under the condition of multiple excitations in the operation, the normal operation is ensured; meanwhile, the structure has high stability, and is convenient for the doctor to operate.

Drawings

For purposes of illustration and not limitation, the 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 the external structure of an electric tube cutting needle according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of a housing of the electric tube cutting needle according to the embodiment of the present invention, wherein the housing is located at one side;

FIG. 3 is a schematic view of the structure of the inside of a housing of an electric tube cutting needle according to an embodiment of the present invention;

FIG. 4 is a schematic view of the motor drive mechanism of the power tube cutting needle of the embodiment of the present invention;

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

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

FIG. 7 is a schematic view of the assembly of the upper chord slider, the cut-off needle hub and the shift block according to the embodiment of the invention;

FIG. 8 is a schematic view of an embodiment of the present invention with a powered cutting needle beginning to be cocked;

FIG. 9 is a schematic diagram of an embodiment of the present invention with the powered cutting needle winding up completed;

FIG. 10 is an exploded view of one view of the assembly of the upper chord slider, the cutoff hub, and the shift block according to the embodiment of the present invention;

FIG. 11 is an exploded view of another view of the upper chord slider, cutoff hub, shift block assembly of an embodiment of the present invention;

FIG. 12 is an exploded view of the top chord slider, cutoff hub, trigger link, shift block assembly of an embodiment of the present invention;

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

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

FIG. 15 is a schematic view of an embodiment of the present invention after actuation of an electric catheter cutting needle;

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

FIG. 17 is a schematic view of the structure of the upper chord slider, the cut-off needle holder, and the outer needle holder on the slide rail according to the embodiment of the invention;

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

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

fig. 20 is a position diagram of the cut-off needle holder and the outer needle holder after excitation;

fig. 21 is a position diagram of the cut-off needle holder and the outer needle holder after winding up;

FIG. 22 is a schematic view of the connection of the shift block to the housing;

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

FIG. 24 is a schematic view of a shift block from another perspective;

fig. 25 is a top view of the connection of the shift block to the outer hub;

fig. 26 is a perspective view of the connection of the shift block to the outer hub;

fig. 27 is a perspective view of the shift block and outer hub connection from another perspective.

In the figure:

1: a winding slider; 2: cutting off the needle seat; 3: a gear adjusting block; 4: an outer needle stand; 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-a battery; 82: an indicator light; 83: a winding button; 84: a display hole; 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: a connection hole; 13: a first longitudinal slot; 14: a tubular structure; 15: pressing down the inclined plane; 16: a bottom edge;

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

31: a retaining wall; 311: gear shifting block lock hook; 32: a chute; 33: a catch hook; 331: a stop hook inclined plane; 332: the top end surface of the catch hook; 34: a pressing part; 35: a connecting wall; 36: a second push button; 37: a notch; 38, a step of carrying out the process; a trapezoidal protrusion; 39: the gear shifting block is convex; 40: a groove;

41: arc angle;

51: triggering a 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 the external structure of an electric tube cutting needle according to an embodiment of the present invention; as shown in fig. 1A and 1B, the electric tube cutting needle includes an upper housing 8 and a lower housing 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 triggering the puncture needle, and a second push button 36 for triggering and shifting the puncture needle; the interface between the upper shell 8 and the lower shell 9 is provided with a display hole 84 and an upper chord button 83 for winding up.

FIG. 2 is an overall internal layout of an electric tube cutting needle according to an embodiment of the present invention, the electric tube cutting needle including a motor drive mechanism, a winding, excitation mechanism, etc.; the motor driving mechanism, the winding and the exciting mechanism are all positioned inside the shell, the shell 9 can be seen in fig. 2, and the upper shell 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 a display hole 84 is positioned on a shell outside the indicator lamp 82; the winding and exciting mechanism comprises a winding slider 1, a cutting needle seat 2, an outer needle seat 4, a gear shifting block 3, an inner needle seat 90 and a spring 85. The spring 85 is disposed between the outer hub 4 and the inner hub 90, and the inner hub 90 is fixed to the housing. The motor driving mechanism drives the winding and exciting mechanism to realize the functions of winding, exciting, resetting and the like. The following describes the technical scheme of the embodiment of the present invention in detail.

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. According to the embodiment of the invention, the electric tube cutting needle is driven to be wound up through the motor, so that the operation is more labor-saving. The motor 7 of the motor driving mechanism drives the screw rod 6, and the screw rod 6 passes through a threaded hole on the inner surface of the circular tube-shaped structure 14 on one side of the upper chord slider 1, which is far away from the cutting needle seat 2, so that the upper chord slider 1 can be driven to slide back and forth along a track positioned on the inner side of the shell, and the front and back sliding direction is parallel to the needle feeding direction during the puncturing operation. Fig. 3 and 4 show two upper chord sliders 1, showing the two end positions of their sliding, and the actual structure is still as shown in fig. 2, with only 1 upper chord slider 1.

The upper chord slider 1 drives the cutting needle seat 2 of the movable 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 sliding block 1 and the circuit board 10 are sequentially arranged in parallel in the direction perpendicular to the needle feeding direction, a front contact switch 91 and a rear contact switch 92 are arranged on one side, close to the upper chord sliding block 1, of the circuit board 10, and when the upper chord sliding block 1 moves forwards and backwards, a first bulge 11 on the circular tube-shaped structure 14 respectively touches the front contact switch 91 and the rear contact switch 92, so that the two switches act; the circuit board 10 is provided with a winding button 83 and an indicator lamp 82, and the indicator lamp 82 is used for displaying the working state of the battery 81 or the connection state with a power supply. As shown in fig. 2, the winding button 83 protrudes from the housing. The motor 7 is connected to a battery 81, and the motor 7 may be connected to an external low-voltage dc power supply.

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

In the embodiment of the present invention, for example, when the winding slider 1 is at the initial position, the first protrusion 11 abuts against the rear contact switch 92, and when the winding button 83 is pressed, the motor 7 rotates to drive the screw rod 6 to rotate, so as to push the winding slider 1 forward (this is a resetting process), after the first protrusion 11 on the surface of the winding slider 1 touches the front contact switch 91, the motor 7 rotates reversely, so as to push the winding slider 1 backward (this is a winding process) through the transmission of the screw rod 6, until the motor 7 stops after the first protrusion 11 touches the rear contact switch 92. The motor 7 is operated by the action generated by the front contact switch 91 and the rear contact switch 92, so that the winding slider 1 moves back and forth, and the action of resetting the winding is realized.

In the embodiment of the invention, before the winding button 83 is pressed and the winding slider 1 moves from back to forth to reset, the needle seat 2 and the outer needle seat 4 are cut off and reset after completing excitation by the thrust of spring force; when in winding, the winding slider 1 is buckled with the cutting needle seat 2, and the winding slider 1 drives the cutting needle seat 2 to move backwards; the position of the front contact switch 91 is set so that the upper chord slider 1 can be moved to the reset position.

In fig. 4, two states of the winding slider are shown, a first state when the winding slider 1 is in the rear position and a second state when it is in 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 excitation operation.

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

The metal shaft 62 extends from a first end of the plastic screw rod 61, the extending end is provided with a first bearing 88 fixedly arranged on the shell, a second end of the plastic screw rod 61 is sleeved on the rotating shaft 71 of the motor 7, a 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 ensured.

The bearing can be independently arranged at the end, far away from the motor, of the screw rod, and the bearing is not arranged at the connecting end of the screw rod and the motor, but the force, close to the motor, of the screw rod is born through the motor, so that 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 winding and exciting mechanism is further described below with reference to the accompanying drawings, wherein the first step of the winding and exciting reset operation is winding; referring to fig. 7, 8 and 9, fig. 7 is a schematic structural diagram of assembly of the winding slider 1, the cutting needle seat 2 and the gear shifting block 3 according to the embodiment of the present invention, in fig. 7, the winding slider 1 drives the cutting needle seat 2 and the gear shifting block 3 to be connected together, and in fig. 7, two winding sliders 1 are seen, and as in fig. 3 and 4, two positions of one winding slider 1 are shown; fig. 8 shows a state when starting winding, in which the winding slider 1, the cut-off needle holder 2, and the outer needle holder 4 are moved in the reverse direction of the needle insertion direction in addition to the lock 3; fig. 9 is a state when winding is completed.

Referring to fig. 10 and 11, fig. 10 and 11 are exploded views of the assembly of the winding slider 1, the cutting hub 2 and the shift block 3 according to the embodiment of the present invention from different angles. The upper chord slider 1 is connected with the cutting needle seat 2 in a buckling manner, a second bulge 21 is arranged at the upper front end of the connecting surface of the cutting needle seat 2 and the upper chord slider 1, and the upper chord slider 1 is provided with a corresponding connecting hole 12; the second bulge 21 stretches into the connecting hole 12 to realize buckling, and the winding slider 1 drives the cutting needle seat 2 to move reversely in the needle inserting direction; the connecting hole 12 can be a through hole or a blind hole, and is shown as a through hole in fig. 10; in fig. 10, the front side surface of the second protrusion 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 slider 1 hooks the second bulge 21 on the cutting needle seat 2 to reversely move towards the needle inserting direction. Referring to fig. 7 to 9, the cut-off needle holder 2 is abutted against the outer needle holder 4 and then slid together 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 and stored. When the winding slider 1 moves to the designated position, the winding slider is locked and immobilized, and the winding action is completed.

The second step of the operation is the excitation. The position of the trigger link 5 is given in fig. 12 and 13, 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-like surface of the unlocking slope 211, pushing the winding slider 1 and the cutting needle holder 2 apart.

In connection with fig. 11, a first longitudinal groove 13 is formed at the connection part of the upper chord slider 1 and the cutting needle seat 2 in fig. 11, and in connection with 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 feeding direction is positioned 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 inside 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 in the second longitudinal slot 22 at a distance from the second protrusion 21; with reference to fig. 1, the trigger button 51 at the rear end of the trigger link 5 is pressed or the first push button 52 connected with the trigger link 5 and arranged in the middle of the shell is pushed, the trigger link 5 is pushed towards the needle inserting direction, and the connecting hole 12 on the upper chord slider 1 and the second bulge 21 on the cutting needle seat 2 are separated from each other through the unlocking inclined plane 211; after the spring 85 between the outer needle seat 4 and the inner needle seat 90 is released, the outer needle seat 4 and the cutting needle seat 2 are pushed to move together in the needle feeding direction; at this time, the outer needle and the cutting needle move in the needle insertion direction at the same time, and under the condition of biopsy operation, the outer needle extends out of the needle tip 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 feeding direction, stops after impacting the rear side part of the gear shifting block 3, and the cutting needle seat 2 continues to move towards the needle feeding direction for a certain distance under the action of inertia after the outer needle seat 4 stops, stops after impacting the gear shifting block 3, and is simultaneously locked by a locking hook structure (the locking hook structure comprises a cutting needle seat locking hook 23 and a gear shifting block locking hook 311) between the two. At this time, an elastic cutting piece is provided at the tip of the cutting needle, and a through hole is provided at a portion of the outer needle near the tip, and the through hole is inserted into the outer needle to cut the tissue in the outer needle.

The state after the excitation of the electric tube cutting needle is shown in fig. 15; in fig. 15, the gear shift block 3 is sleeved at the bottoms of the cutting needle seat 2 and the outer needle seat 4; with reference to fig. 16, the left and right sides of the top of the gear shifting block 3 are respectively provided with a blocking wall 31 parallel to the needle feeding direction, and a sliding groove 32 is arranged between the blocking walls 31. In fig. 15, the bottoms of the cutting needle stand 2 and the outer needle stand 4 are provided with corresponding rectangular bosses which can move in the sliding grooves 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 a baffle wall 31 of the gear shifting block 3 is upwards bent to form a baffle hook 33 vertical to the needle inserting direction, and one side of the end part of the baffle hook 33 far away from the needle inserting direction is provided with a baffle hook inclined plane 331 corresponding to the downward-pressing inclined plane 15; the baffle wall 31 is provided with a baffle block lock hook 311 which extends upwards near the baffle hook 33, the side surface of one side of the baffle block lock hook 311 in the needle feeding direction is a vertical surface, the other side of the baffle block lock hook 311 is an inclined surface which inclines outwards, the corresponding position on the cutting needle seat 2 is provided with a cutting needle seat lock hook 23 which extends towards the baffle block 3, the side surface of one side of the needle feeding direction of the cutting needle seat lock hook 23 is an inclined surface which inclines outwards, and the side surface of the other side is a vertical surface; before the catch 33 is pressed down, the cut-off needle holder lock hook 23 and the shift block lock hook 311 are positioned on a straight line parallel to the needle insertion direction so that they are hooked with each other.

In fig. 15, the upper chord slider 1 moves toward the needle insertion direction, the gear shifting block 3 is pressed by the pressing down inclined surface 15 of the upper chord slider 1 in the direction away from the upper chord slider 1 (i.e. the lower side in fig. 15), and the gear shifting block locking hook 311 and the cutting needle seat locking hook 23 are separated from each other, so that the state shown in fig. 8 is shown; after the upper chord sliding block 1 continues to move towards the needle feeding direction, the lock hook between the cut-off needle seat 2 and the gear shifting block 4 keeps a separated state all the time; after the winding slider 1 continues to move to the front trigger switch 91 in the needle insertion direction, the winding action is repeated: the connecting hole 12 on the upper chord slider 1 hooks the first bulge 21 on the cutting needle seat 2 to reversely move in the needle inserting direction, at the moment, the cutting piece is separated from the through hole of the outer needle close to the needle point, the cutting needle seat 2 moves to reversely slide in the needle inserting direction together with the outer needle seat 4 after being propped against the outer needle seat 4, the spring 85 between the outer needle seat 4 and the inner needle seat 90 is compressed for storing energy, at the moment, the inner needle extends out of the outer needle, and if the tissue is taken in the outer needle, the inner needle can push out the taken tissue.

In fig. 2 to 4 and fig. 7, the state of the gear shift block latch hook 311, the cut-off needle seat latch hook 23, the pressing down inclined surface 15, and the latch hook inclined surface 331 should be as shown in fig. 8, that is, the latch hook top end surface 332 of the latch hook 33 abuts against the bottom edge 16 of the upper chord slider 1, so that the gear shift block latch hook 311 and the cut-off needle seat latch hook 23 are kept in the disengaged state.

When the winding slider 1 moves to a designated position, the winding slider is locked and is not moved, the winding action is completed, and the next biopsy exciting action can be performed.

The structure of the winding and exciting mechanism is introduced, and the working processes of winding and exciting reset are as follows:

when the winding starts, the cutting-off needle seat 2 and the outer needle seat 4 are in an excited state, and the winding slide block 1 is positioned at a first rear position; pressing the upper chord button 83, moving the upper chord slider 1 towards the needle inserting direction, pressing the stop hook 33 away from the upper chord slider 1 by the pressing inclined surface 15, disconnecting the needle seat lock hook 23 from the gear shifting block lock hook 311, continuing to move the upper chord slider 1 towards the needle inserting direction, buckling the connecting hole 12 at the end part of the upper chord slider 1 with the second bulge 21 at the end part of the disconnected needle seat 2, and contacting the first bulge 11 of the upper chord slider 1 with the front contact switch 91; the upper chord sliding block 1 drives the cutting needle seat 2 to move reversely along with the needle feeding direction; after the cutting needle seat 2 touches the outer needle seat 4, the upper chord slider 1, the cutting needle seat 2 and the outer needle seat 4 move reversely in the needle-feeding direction together, the first bulge 11 of the upper chord slider 1 contacts with the rear contact switch 92, the upper chord slider 1 stops moving, and the spring 85 between the outer needle seat 4 and the inner needle seat 90 is compressed.

When the needle is excited, the trigger connecting rod 5 moves towards the needle inserting direction, moves along the slope of the unlocking inclined plane 211, separates 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 force 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 to touch the gear shifting block 3 to stop under the inertia effect, and meanwhile, the cutting needle seat lock hook 23 and the gear shifting block lock 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 slider 1 to be buckled with the cutting needle seat 2, driving the cutting needle seat 2 and the outer needle seat 4 to move reversely in the needle feeding direction, and finishing winding; the trigger connecting rod 5 is pressed, the outer needle seat 4 and the cutting needle seat 2 move towards the needle feeding direction, and the outer needle seat 4 and the cutting needle seat 2 are blocked by the gear shifting block 3 in sequence, so that excitation is completed.

As shown in fig. 17 to 19, the housing has two parallel rails, the winding slider 1 is located on the first rail 86, and the cut-off 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 housing of the second rail 87 where the cut-off needle holder 2 and the outer needle holder 4 are located, so that the cut-off needle holder 2 or the outer needle holder 4 can be seen from the inside of the rail, and the winding condition in the housing is judged by setting the cut-off needle holder 2 and the outer needle holder 4 to different colors; fig. 20 is a position diagram of the outer hub 4 and the cut-off hub 2 after excitation, the outer hub 4 being visible from the indication window 93; fig. 21 shows the positions of the cut-off needle holder 2 and the outer needle holder 4 after winding, the cut-off needle holder 2 is visible from the indication window 93, and when the cut-off needle holder 2 is visible, the winding is completed, and the excitation can be performed.

Referring to fig. 22 and 23, fig. 22 is a schematic structural view of a connection between a shift block and a housing, and fig. 23 is a schematic structural view of a connection portion between the housing and the shift block; in fig. 22, the gear shifting block 3 extends towards the needle inserting direction near one side of the shell to form a pressing part 34, the pressing part 34 is connected with a second push button 36 arranged at the outer side of the shell through a connecting wall 35, a long through hole 94 for moving the second push button 36 is arranged on the shell, the pressing part 34 and the front end of the baffle wall 31 are arranged in an upper and lower two-body manner, and a notch 37 is arranged between the pressing part 34 and the front end of the baffle wall 31; the two-body design of the pressing part 34 and the front end of the baffle wall 31 is to realize elastic deformation more easily, and the pressing of the second push button 36 and the pressing of the pressing inclined surface 15 to the baffle 3 are realized more easily. Trapezoidal protrusions 38 are respectively arranged on two sides of the connecting wall 35, a plurality of trapezoidal clamping grooves 95 with shapes and sizes corresponding to those of the trapezoidal protrusions 38 are longitudinally arranged on two sides of the long through hole 94 on the shell, and three trapezoidal clamping grooves 95 are formed in the embodiment; when no external force is applied to the second push button 36, the trapezoid protrusion 38 is just positioned in the trapezoid clamping groove 95, a force is applied to the second push button 36 towards the inner side of the shell, the trapezoid protrusion 38 is separated from the trapezoid clamping groove 95, and the gear shifting block 3 can be pushed by the second push button 36 to move parallel to the needle inserting direction; in this way, the shift block 3 is slidably disposed on the housing and positioned by the trapezoidal clamping groove 95. In fig. 22, the side 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 outwards; due to the inclined surface on the opposite side of the needle insertion direction of the trapezoidal protrusion 38, the push down is not required when the needle insertion direction is reversed, and the shift can be performed when the needle insertion direction is reversed.

The back of the second push button 36 is provided with a gear shifting block protrusion 39, and after excitation, the cutting needle seat 2 just abuts against the gear shifting block protrusion 39, so that the excited biopsy needle cannot be shifted. After winding, the needle holder 2 is cut off from the position of the shift block protrusion 39, and the second push button 36 can be pressed to shift. The shift block protrusion 39 is provided to prevent a doctor from erroneously operating a shift position after sampling, causing the inner needle and the cutting needle to press the tissue in the outer needle, so that shift can be performed as needed only after winding.

In the embodiment of the invention, the shifting method of the shifting block 3 is as follows: pushing the second push button 36 in the reverse direction of the needle feeding direction, and shortening the stroke of cutting off the needle seat 2 and the outer needle seat 4; the second push button 36 is pushed down to push the second push button 36 in the needle insertion direction, and the stroke for cutting off the needle holder 2 and the outer needle holder 4 becomes longer.

Fig. 24 is a schematic view of another view of the shift block 3 according to the embodiment of the present invention, from which it can be seen that the shift block protrusion 39 is located at the back 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 arranged in the chute 32 of the connection surface of the gear shifting block 3, the cutting-off needle seat 2 and the outer needle seat 4. Referring to fig. 11, the right end of the cut-off needle holder 2 on the side close to the shift block 3 extends to the shift block 3 to form an extension portion 24, and the size of the extension portion 24 corresponds to the size of the groove 40; after excitation, the cutting needle seat 2 moves towards the needle feeding direction, the extension part 24 is positioned in the groove 40, and the extension part 24 is impacted on the wall of the groove 40 to stop, so that weak parts such as a blocking hook and the like of the cutting needle seat 2 are avoided.

The outer hub 4 and the cut-off hub 2 are stopped by striking on the gear shift block 3, as shown in fig. 25 to 27, when the outer hub 4 strikes on the gear shift block 3, two arc angles 41 are arranged on the outer hub 4, the arc angles 41 are positioned at the tail parts of rectangular bosses 42 of the outer hub 4 sliding in the sliding grooves 32, and are positioned between the side surfaces of the rectangular bosses 42 and a baffle wall 43 of the outer hub 4; when the outer needle seat 4 slides along the sliding groove 32 of the gear shifting block 3, the arc angle 41 firstly impacts the two walls of the sliding groove 32, and the shake of the outer needle can be reduced by the elastic energy absorption mode that the two walls of the sliding groove 32 expand outwards.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives can occur depending upon design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (11)

1. The electric tube cutting needle comprises a puncture biopsy needle assembly and a shell, wherein the puncture biopsy 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, and the electric tube cutting needle is characterized by further comprising a winding sliding block (1) and a gear shifting block (3);

the shell is provided with a first track (86) and a second track (87) which are parallel to the needle inserting direction;

the upper chord slider (1) is positioned on the first track (86);

the cutting needle seat (2), the outer needle seat (4) and the inner needle seat (90) are sequentially arranged on the second track (87) from the near to the far according to the distance from the needle outlet end;

the inner needle seat (90) is fixedly connected with the shell, and a spring (85) is arranged between the inner needle seat (90) and the outer needle seat (4);

the gear shifting block (3) is blocked on a travelling route after the needle seat (2) and the outer needle seat (4) are cut off and excited; after excitation, the outer needle seat (4) and the cutting needle seat (2) are contacted with the gear shifting block (3) in sequence to stop;

the upper chord slider (1) can move along the first track (86) under the drive of the motor driving mechanism, so that the cutting needle seat (2) and the outer needle seat (4) are driven to move to the upper chord position in the reverse direction of the needle feeding direction.

2. The powered tube cutting needle according to claim 1, wherein the motor drive mechanism comprises a motor (7), a screw (6), a controller, a position sensing element, a trigger element, wherein:

a circular tube-shaped structure (14) is arranged on one side, far away from the cutting needle seat (2), of the upper chord sliding block (1), and a threaded hole through which a screw rod (6) passes is formed in the inner surface of the circular tube-shaped structure (14);

the motor (7) is connected with the screw rod (6);

a position sensing element is arranged near the travelling route of the winding slider (1), and the position sensing element is electrically connected with a controller;

the trigger element is electrically connected with the controller.

3. The electric tube cutting needle according to claim 2, wherein the controller is a circuit board (10), the position sensing element comprises a front contact switch (91) and a rear contact switch (92), the triggering element is a winding button (83) provided on the housing, wherein:

the circuit board (10) is connected to the shell, and the circuit board (10) is parallel to the upper chord sliding block (1);

a front contact switch (91) and a rear contact switch (92) are arranged on one side, close to the upper chord slider (1), of the circuit board (10);

a first bulge (11) is arranged on the circular tube-shaped structure (14);

when the upper chord slider (1) moves to the two ends of the stroke on the first track (86), the first bulge (11) respectively touches the rear face of the front contact switch (91) and the front face of the rear contact switch (92).

4. An electric tube cutting needle according to claim 2, characterized in that the motor (7) is connected to a battery (81) provided in the housing or to an external low voltage dc power supply.

5. The power cutting needle according to claim 4, wherein the motor driving mechanism further comprises an indicator light (82), the indicator light (82) being connected to the controller, the indicator light (82) being adapted to display an operating state of the battery (81) or a connection state to a power source;

and a display hole (84) is formed in the position of the indicator lamp (82) on the shell.

6. An electric tube cutting needle according to claim 2, characterized in that the two ends of the screw (6) are located on a first bearing (88) and a second bearing (89) fixed to the housing, respectively.

7. The power tube cutting needle according to claim 1, wherein the connection surface of the cutting needle seat (2) and the upper chord slider (1) is provided with a second bulge (21), and the upper chord slider (1) is provided with a corresponding connection hole (12);

when in winding, the connecting hole (12) on the winding slider (1) hooks the second bulge (21) on the cutting needle seat (2) to move reversely in the needle inserting direction.

8. The electric tube cutting needle according to claim 7, wherein the side surface of the second protrusion (21) on the needle insertion direction side is a vertical surface, the side surface of the second protrusion on the opposite side of the needle insertion direction is an unlocking inclined surface (211), and the unlocking inclined surface (211) is an inclined surface inclined to the outside;

the trigger connecting rod (5) is positioned between the upper chord sliding block (1) and the cutting needle seat (2) and is positioned at one side of the unlocking inclined plane (211) far away from the needle feeding direction.

9. The power tube cutting needle according to claim 8, wherein the trigger link (5) is provided with a trigger button (51) at the rear end thereof, the trigger link (5) being connected to a first push button (52) provided in the middle of the housing.

10. The power tube cutting needle according to claim 1, wherein the front end of the gear shifting block (3) is provided with a stop hook (33), and the front end of the upper chord slider (1) is provided with a pressing inclined plane (15);

when the upper chord sliding block (1) moves to the needle inserting direction and passes through the blocking hook (33), the downward pressing inclined surface (15) presses the blocking hook (33) in the direction away from the upper chord sliding block (1), so that the front end of the gear shifting block (3) moves in the direction away from the upper chord sliding block (1);

the front end of the gear shifting block (3) is provided with a gear shifting block lock hook (311), and a corresponding position on the cutting needle seat (2) is provided with a cutting needle seat lock hook (23);

before the stop hook (33) is pressed down, the lock hook (23) of the cutting needle seat and the lock hook (311) of the gear shifting block are positioned on a straight line parallel to the needle inserting direction.

11. The power tube cutting needle according to claim 10, wherein the side of one side of the needle insertion direction of the shift block lock hook (311) is a vertical face, and the side of the opposite side is an inclined face inclined outward;

the side surface of one side of the needle inserting direction of the needle seat locking hook (23) is an inclined surface which is inclined outwards, and the side surface of the opposite side is a vertical surface.