CN217285998U

CN217285998U - Puncture needle and electrode surgical instrument

Info

Publication number: CN217285998U
Application number: CN202220429664.XU
Authority: CN
Inventors: 衷兴华; 马剑豪; 杨克
Original assignee: Hangzhou Vena Anke Medical Technology Co ltd
Current assignee: Hangzhou Vena Anke Medical Technology Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-08-26
Anticipated expiration: 2032-03-01

Abstract

The utility model discloses a puncture needle and an electrode surgical instrument, wherein the puncture needle comprises a needle body, a protective sleeve and an opening and closing piece; the needle body is provided with a puncture end, the protective sleeve is in sleeve fit with the needle body, and the opening-closing piece is arranged at one end of the protective sleeve, which is adjacent to the puncture end of the needle body; the opening and closing piece is in a first state of being in sealing butt joint with the needle body and allowing the puncture end of the needle body to extend out, and the opening and closing piece is also in a second state of retracting the needle body into the protective sleeve and plugging the protective sleeve; by the arrangement, after the puncture needle punctures tissues, the protective sleeve and the opening and closing piece can ensure that the needle body can not touch other tissues when being taken out of a human body after puncture, thereby effectively preventing needle channel transfer in the puncture operation; the electrode surgical instrument can perform ablation operation immediately after puncture operation, further prevents needle passage transfer and greatly accelerates the operation process.

Description

Puncture needle and electrode surgical instrument

Technical Field

The utility model relates to the field of medical equipment, in particular to puncture needle and electrode surgical instrument.

Background

In the diagnosis and treatment of tumors, a puncture operation is usually adopted for pathological detection, specifically, a puncture needle is used for puncturing organs or tissues, and suspicious tissues are obtained through the puncture needle for pathological characterization, so that a further accurate treatment scheme is provided.

However, the existing puncture operation easily causes tumor metastasis along the needle channel, which is not beneficial to the later-stage accurate treatment, and the organs or tissues around the punctured tissues are damaged and need to be repaired by other medical operations, so that the operation treatment process is prolonged, the physical burden of the patient is increased, and great pain is caused to the patient, and therefore improvement is urgently needed.

SUMMERY OF THE UTILITY MODEL

The embodiment provides a puncture needle and an electrode surgical instrument, aiming at preventing the needle channel from deviating in the puncture operation.

In order to achieve the purpose, the utility model provides a puncture needle, which comprises a needle body, a protective sleeve and an opening and closing piece; the needle body is provided with a puncture end, the protective sleeve is in sleeve fit with the needle body, and the opening-closing piece is arranged at one end, close to the puncture end of the needle body, of the protective sleeve; the piece of opening and shutting have with the sealed butt of needle body supplies the first state that the puncture end of needle body stretches out, the piece of opening and shutting still has the needle body retracts to in the protective sheath and will the second state of protective sheath shutoff.

The utility model discloses an in some embodiments, the piece that opens and shuts includes a plurality of closed pieces, and is a plurality of the closed piece is the annular and arranges, and is a plurality of the closed piece is in when opening and shutting is in the first state along the radial expansion of protective sheath, it is a plurality of the closed piece is in when opening and shutting is in the second state along the radial of protective sheath is gathered together.

In some embodiments of the present invention, the sealing block is made of an elastic material, and the sealing block is fixed to the protective sheath.

In some embodiments of the present invention, a plurality of the closing blocks are further disposed along an axial extension of the protective sheath, such that the plurality of closing blocks jointly constitute a cone structure.

In some embodiments of the utility model, the needle body has the push-and-pull end of keeping away from the puncture end, the push-and-pull end stretches out all the time the protective sheath is kept away from the one end setting of piece opens and shuts.

In some embodiments of the present invention, the push-pull end of the needle body is provided with a force application block.

In some embodiments of the present invention, the puncturing end of the needle body is provided with two clamping blocks, two clamping blocks are arranged in parallel along the axial direction of the needle body, and the clamping blocks are far away from one end of the needle body is close to the setting.

The utility model also provides an electrode surgical instrument, which comprises a shell, an electrode needle, a driving device and the puncture needle; the electrode needle is arranged in the shell, a sliding channel with two open ends is arranged on the electrode needle, the puncture needle is movably arranged in the sliding channel, and a protective sleeve of the puncture needle is in clearance fit with the inner wall of the sliding channel; the driving device is arranged on the shell and used for driving the protective sleeve of the puncture needle to move so as to enable the protective sleeve to extend out of or retract into the electrode needle.

In some embodiments of the present invention, the driving device comprises a motor, a main gear and a secondary gear; the motor is arranged on the shell, the main gear is connected with an output shaft of the motor, the pinion is rotatably arranged on the shell and meshed with the main gear, and a threaded hole is formed in the pinion in the thickness direction; the protruding guide post that is equipped with of periphery wall of protective sheath, the internal perisporium of electrode needle along its extending direction concave be equipped with guide post complex guide way, the guide post with guide way sliding connection, the protective sheath still be provided with screw hole screw-thread fit's screw thread section, motor drive the master gear drives the pinion rotates with the drive the protective sheath is in the axial of pinion upward movement.

In some embodiments of the present invention, a button is further disposed on the outer surface of the housing, the button is electrically connected to the driving device, and the button is used for controlling the driving device to operate.

The utility model arranges the protective sleeve which is in sleeve joint with the needle body on the puncture needle, and arranges the opening and closing piece at one side of the protective sleeve which is adjacent to the puncture end of the needle body, the opening and closing piece has a first state for the needle body to extend out and a second state for the needle body to retract into the protective sleeve to block the protective sleeve, the arrangement is such that after the puncture needle punctures tissues, the protective sleeve and the opening and closing piece can ensure that the needle body can not touch other tissues when being taken out from the human body after puncturing, thereby effectively preventing needle path transfer in the puncture operation; and the electrode surgical instrument provided with the puncture needle can perform ablation operation immediately after puncture operation, further prevent needle passage transfer and greatly accelerate the operation process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a cross-sectional view of the structure of one embodiment of a mid-puncture needle of the present invention;

FIG. 2 is a schematic structural view of an embodiment of the middle puncture needle of the present invention;

FIG. 3 is an enlarged view of the portion A in FIG. 2;

FIG. 4 is a schematic view of the puncture end of the needle body of the utility model;

FIG. 5 is a schematic view of an embodiment of the middle electrode surgical instrument of the present invention;

FIG. 6 is a cross-sectional view of an embodiment of the middle electrode surgical instrument of the present invention;

fig. 7 is an enlarged schematic view of a structure of a part B in fig. 6.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name(s)
				1000	Puncture needle	2000	Electrode surgical instrument
100	Needle body	400	Shell body
				110	Puncture tip	410	Push button
111	Clamping block	500	Electrode needle
				120	Push-pull end	500a	Sliding channel
121	Force application block	500b	Guide groove
				200	Protective sleeve	600	Drive device
210	Guide post	610	Electrical machine
				220	Thread segment	620	Master gear
300	Opening and closing piece	630	Auxiliary gear
				310	Sealing block	631	Threaded hole

The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.

The utility model provides a puncture needle 1000, which can effectively avoid the problem of needle passage transfer when the puncture needle 1000 is used for puncture operation.

Referring to fig. 1 and 2, the puncture needle 1000 includes a needle body 100, a protective sheath 200 and an opening member 300; wherein, the needle body 100 has a puncture end 110, the protection cover 200 is fit with the needle body 100, and the opening and closing member 300 is disposed at one end of the protection cover 200 adjacent to the puncture end 110 of the needle body 100.

Specifically, the needle body 100 is in a shape of a cylindrical strip, and the puncturing end 110 is in a shape of a sharp spike so as to facilitate puncturing of tissue. In addition, the shape of the protection sleeve 200 is various, the protection sleeve 200 can be set in a cylindrical shape, the protection sleeve 200 can also be set in a square bar shape, the protection sleeve 200 can also be set in other long bar shapes, and preferably, the protection sleeve 200 and the needle body 100 are both in a cylindrical shape, so as to ensure that the wall thickness of the protection sleeve 200 is uniform.

The protective sheath 200 is sleeved on the needle body 100, and the needle body 100 and the protective sheath 200 are in clearance fit so that the needle body 100 can slide in the protective sheath 200. It should be noted that, in order to avoid that the needle body 100 cannot pierce the tissue during the surgical puncture due to insufficient hardness, the needle body 100 may be made of a metal material with high hardness, such as titanium alloy, stainless steel, nickel titanium alloy, etc., and the material used for the needle body 100 is not limited herein as long as it can pierce the tissue and use a medical environment-friendly material.

On the other hand, since the puncture needle 1000 is used in an interventional operation, i.e. the protective sheath 200 needs to penetrate into the human body, the protective sheath 200 can be in direct contact with the tissue of the human body, the chemical properties of the material used for the protective sheath 200 should be stable, not prone to degradation, cross-linking or physical wear, and the protective sheath 200 also has good biocompatibility.

The opening element 300 is disposed at one end of the protective sheath 200 adjacent to the puncture end 110 of the needle body 100, the opening element 300 can be separately present and mounted on the protective sheath 200, at this time, the connection between the opening element 300 and the protective sheath 200 can be a detachable connection, such as a snap connection, a threaded connection, etc., or the connection between the opening element 300 and the protective sheath 200 can be a fixed connection, such as an ultrasonic welding, an adhesive, etc.; the opening member 300 can also be integrally formed with the protective sheath 200, and the specific connection manner of the opening member 300 and the protective sheath 200 is not limited herein.

The opening and closing member 300 has a first state of being in sealing contact with the needle body 100 and allowing the puncture tip 110 of the needle body 100 to extend out, and the opening and closing member 300 has a second state of retracting the needle body 100 into the protective sheath 200 and blocking the protective sheath 200.

Specifically, the opening and closing member 300 has various mechanical parts for forming the first state and the second state, for example, a door body is arranged on the protective sheath 200, the door body is hinged to the protective sheath 200, the first state of the opening and closing member 300 can be formed when the door body is opened, the protective sheath 200 extends out of the needle body 100, and the second state of the opening and closing member 300 can be formed when the door body 100 retracts into the protective sheath 200;

for another example, a rotating shaft is protruded from the edge of the end surface of the protective sheath 200 adjacent to the puncturing end 110, and a rotating block is disposed to be rotatably engaged with the rotating shaft, so that when the rotating block is rotated to have its edge completely staggered from the edge of the protective sheath 200, the first state of the opening/closing member 300 can be formed, and when the rotating block is rotated to have its edge overlapped with the edge of the protective sheath 200, the second state of the opening/closing member 300 can be formed.

In addition, the opening and closing member 300 moves from the first state to the second state or from the second state to the first state, and may be driven by other mechanisms, or may be driven by the needle 100 to perform, and the specific mechanism by which the opening and closing member 300 drives the performing action is not specifically limited herein.

Through above-mentioned technical scheme, set up on this pjncture needle 1000 and cup joint complex protective sheath 200 with needle body 100, and set up opening and shutting 300 in one side that the puncture end 110 of protective sheath 200 is close to needle body 100, this opening and shutting 300 has the first state that supplies needle body 100 to stretch out and the second state of protective sheath 200 at needle body 100 withdrawal protective sheath 200, make this pjncture needle 1000 organize the back in puncturing, protective sheath 200 can guarantee with opening and shutting 300 that needle body 100 can not touch other tissues when removing, the effectual needle track that prevents takes place in the puncture operation shifts.

Referring to fig. 3, in an embodiment of the present invention, the opening member 300 includes a plurality of sealing blocks 310, the sealing blocks 310 are arranged in a ring shape, the sealing blocks 310 are expanded along a radial direction of the protection cover 200 when the opening member 300 is in the first state, and the sealing blocks 310 are gathered along the radial direction of the protection cover 200 when the opening member 300 is in the second state.

Specifically, when the plurality of closing blocks 310 are deployed along the radial direction of the protection sheath 200, the needle body 100 can extend out of the protection sheath 200, and when the needle body 100 is retracted into the protection sheath 200, the plurality of closing blocks 310 are gathered along the radial direction of the protection sheath 200 to close the protection sheath 200, so that the needle body 100 can be prevented from contacting with other tissues or blood of the human body.

The action that a plurality of closed blocks 310 carried out radial expansion or radially gathered together can be driven by the mechanism and carry out, also can directly drive the execution through needle body 100, and for convenience each closed block 310 carries out the action, a plurality of closed blocks 310 all adopt elastic material to make, the one end and the protective sheath 200 fixed connection of a plurality of closed blocks 310, the other end of a plurality of closed blocks 310 all extends to the axis position of protective sheath 200.

With such arrangement, when the opening and closing member 300 needs to move from the second state to the first state, the needle body 100 slides towards the direction extending out of the protection sleeve 200, the plurality of sealing blocks 310 are pushed by the needle body 100 to be radially expanded under the action of the elastic force of the sealing blocks, and at the moment, the needle body 100 extends out of the protection sleeve 200 to perform puncture; when the opening member 300 needs to move from the first state to the second state, the needle 100 slides in the direction of retracting the protection sheath 200, and the plurality of closing blocks 310 are gathered together radially under the action of the elastic force thereof to close the protection sheath 200.

It should be noted that there are various elastic materials used for the sealing block 310, the elastic material used for the sealing block 310 may be a rubber material, such as PU (polyurethane rubber), SI (silicone rubber), NBR (nitrile butadiene rubber), etc., and the specific elastic material used for the sealing block 310 is not limited herein.

In addition, one end of each sealing block 310 is fixedly connected to the protection sleeve 200, and the connection manner of the sealing block 310 is the same as that of the opening and closing element 300 and the protection sleeve 200, which is not described herein again, for convenience of connecting each sealing block 310 to the protection sleeve 200, in this implementation, each sealing block 310 is integrally formed with the protection sleeve 200, so that the number of parts is reduced, and the number of installation steps is also reduced.

To facilitate insertion of the needle 1000 into the body, a plurality of blocks 310 are also provided along the axial extent of the sheath 200 such that the plurality of blocks 310 collectively form a cone-shaped structure. So set up, the guide inclined plane of the periphery wall self-formation of cone makes things convenient for pjncture needle 1000 to stretch into the human body and carries out the puncture operation.

In an embodiment of the present invention, the needle body 100 is driven to slide in the protective sheath 200 by manual pushing, so that the human hand pushes the needle body 100 conveniently, the needle body 100 has a push-pull end 120 far away from the puncture end 110, and the needle body 100 can slide in the protective sheath 200 by pushing and pulling the push-pull end 120, so that the opening and closing member 300 has the first state and the second state.

It should be noted that, in order to facilitate the pushing and pulling of the needle body 100, the push-pull end 120 is always disposed to extend out of the end of the protection sheath 200 away from the opening-closing element 300, and the push-pull end 120 of the needle body 100 is disposed with the force applying block 121.

Further, the force applying block 121 may be disposed at an end of the push-pull end 120 of the needle body 100, the force applying block 121 may also be disposed at a side of the push-pull end 120 of the needle body 100 adjacent to the protecting sheath 200, and the position of the force applying block 121 disposed at the needle body 100 only needs to satisfy the requirement of the protecting sheath 200. The shape of this application of force piece 121 has the multiple, and this application of force piece 121 can be the cuboid setting, and this application of force piece 121 also can be the cylinder setting, and this application of force piece 121 can also be other kinds of shapes settings, does not do the specific limitation here.

Referring to fig. 4, in order to facilitate the needle body 100 to puncture tissue, the puncturing end 110 of the needle body 100 is provided with two holding blocks 111 arranged in parallel along the axial direction of the needle body 100, and ends of the two holding blocks 111 far away from the needle body 100 are arranged close to each other. So set up, two grip blocks 111 form the puncture structure, conveniently puncture the tissue.

Referring to fig. 5 to 7, the present invention further provides an electrode surgical instrument 2000, wherein the electrode surgical instrument 2000 includes a housing 400, an electrode needle 500, a driving device 600 and a puncture needle 1000; the electrode needle 500 is arranged in the housing 400, the electrode needle 500 is provided with a sliding channel 500a with two open ends, the puncture needle 1000 is movably arranged in the sliding channel 500a, and the protective sleeve 200 of the puncture needle 1000 is in clearance fit with the inner wall of the sliding channel 500 a; the driving means 600 is mounted on the housing 400, and the driving means 600 is used to drive the protective sheath 200 of the puncture needle 1000 to move so that the protective sheath 200 extends or retracts the electrode needle 500.

It should be noted that, in the specific structure of the puncture needle 1000 in the electrode surgical instrument 2000, reference is made to the above-mentioned embodiments, and since the puncture needle 1000 adopts all technical solutions of all the above-mentioned embodiments, at least all beneficial effects brought by the technical solutions of the above-mentioned embodiments are achieved, and details are not repeated here.

Specifically, the electrode needle 500 is disposed in a cylindrical shape so as to conveniently extend into the human body, and the sliding channel 500a of the electrode needle 500 is also disposed in a cylindrical shape, so that the wall thickness of the electrode needle 500 is uniform. This electrode needle 500 is provided with positive conducting ring and the negative conducting ring of being connected with pulser, and pulser is used for applying electric pulse so that electrode needle 500 utensil melts the effect, so sets up, can immediately melt the operation after carrying out the puncture operation, further prevents the needle track and shifts, has also accelerated the process of operation greatly.

It should be noted that, in order to ensure that the needle body 100 can slide in the protective sheath 200, the push-pull end 120 of the needle body 100 needs to be extended out of the casing 400, so as to ensure that the needle body 100 can slide in the protective sheath 200 under the pushing and pulling of the push-pull end 120.

Further, there are various mechanisms for driving the protective sleeve 200 to move in the sliding channel 500a by the driving device 600, for example, the driving device 600 may be composed of a motor, a screw rod and a sliding block, the motor is fixedly mounted on the housing 400, an output shaft of the motor is connected to the screw rod, the sliding block is provided with a threaded hole in threaded connection with the screw rod, the sliding block is also fixedly connected to the protective sleeve 200, and the motor operates to drive the screw rod to rotate so as to enable the sliding block to move in the extending direction of the screw rod, thereby driving the protective sleeve 200 to slide in the sliding channel 500 a;

for another example, the driving device 600 may also be composed of a motor, two driving wheels and a driving belt, the motor is fixedly installed on the housing 400, the two driving wheels are rotatably installed on the housing 400, an output shaft of the motor is connected to one driving wheel, the driving belt is sleeved on the two driving wheels, the driving belt is fixedly connected to the protection sleeve 200, and the motor reciprocates at a predetermined angle to drive the driving wheel to rotate so as to drive the driving belt to rotate, thereby driving the protection sleeve 200 to slide in the sliding channel 500 a. There are many mechanisms for driving the sheath 200 in the sliding channel 500a by the driving device 600, which are not listed here.

In an embodiment of the present invention, the driving device 600 includes a motor 610, a main gear 620, and a sub-gear 630; the motor 610 is installed on the housing 400, the main gear 620 is connected with an output shaft of the motor 610, the pinion 630 is rotatably installed on the housing 400 and meshed with the main gear 620, and a threaded hole 631 is formed in the pinion 630 along the thickness direction thereof; the outer peripheral wall of the protective sleeve 200 is convexly provided with a guide post 210, the inner peripheral wall of the electrode needle 500 is concavely provided with a guide groove 500b matched with the guide post 210 along the extending direction thereof, the guide post 210 is slidably connected with the guide groove 500b, the protective sleeve 200 is further provided with a threaded section 220 in threaded fit with the threaded hole 631, and the motor 610 drives the main gear 620 to drive the secondary gear 630 to rotate so as to drive the protective sleeve 200 to move in the axial direction of the secondary gear 630.

It should be noted that the modules of the main gear 620 and the sub-gear 630 are the same, so that the main gear 620 is in tooth-meshing with the sub-gear 630, in addition, the number of teeth of the main gear 620 may be set to be greater than that of the sub-gear 630, the number of teeth of the main gear 620 may also be set to be less than that of the sub-gear 630, the number of teeth of the main gear 620 may also be set to be equal to that of the sub-gear 630, and preferably, the number of teeth of the main gear 620 is set to be less than that of the sub-gear 630, so as to reduce the output rotation speed of the motor 610 and increase the output torque.

Considering that there are many parts of the electrode surgical instrument 2000 and the housing 400 is pistol-shaped, in order to make the internal parts of the electrode surgical instrument 2000 mounted more compactly matching the shape of the housing 400, the gear pair of the main gear 620 and the pinion 630 of the driving device 600 is bevel gear, and the bevel gear can realize vertical rotation transmission, so the arrangement of the internal parts of the housing 400 can be made more compact, the volume of the electrode surgical instrument 2000 as a whole can be reduced, and the operation can be conveniently performed.

In order to ensure that when the screw hole 631 is in threaded connection with the threaded section 220 of the protective sleeve 200 when the secondary gear 630 rotates, the protective sleeve 200 does not rotate with the secondary gear 630 but slides in the sliding channel 500a, the guide post 210 is convexly arranged on the outer peripheral wall of the protective sleeve 200, the guide groove 500b matched with the guide post 210 is concavely arranged on the inner peripheral wall of the electrode needle 500 along the extending direction of the electrode needle, the guide post 210 is in sliding connection with the guide groove 500b, and thus, the rotation of the protective sleeve 200 in the circumferential direction is limited by the guide groove 500b, and the protective sleeve 200 can slide in the sliding channel 500 a.

Specifically, the cross section of the notch of the guiding groove 500b may be a square, the cross section of the notch of the guiding groove 500b may also be a semicircular, and the cross section of the notch of the guiding groove 500b may also be provided in other shapes, which are not listed here.

In order to control the driving device 600 to drive the puncture needle 1000 to slide back and forth in the sliding channel 500a, a button 410 is further disposed on the outer surface of the housing 400, the button 410 is electrically connected to the driving device 600, and the button 410 is used to control the driving device 600 to operate.

Specifically, when the control driving device 600 is required to drive the puncture needle 1000 to extend out of the sliding channel 500a of the electrode needle 500, the button 410 is pressed and held, the button 410 is switched on to control the driving device 600 to work, so that the puncture needle 1000 extends out of the sliding channel 500a of the electrode needle 500, and when the sliding is required to be suspended, the driving device 600 stops working as long as the button 410 is released; when it is required to retract the puncture needle 1000 into the sliding channel 500a of the electrode needle 500, the push button 410 is pushed again and held, where the push button 410 is operated by the driving means 600 so that the puncture needle 1000 is retracted into the sliding channel 500a of the electrode needle 500, and when it is required to suspend the sliding, the driving means 600 is stopped by releasing the push button 410.

It should be noted that the button 410 may be disposed at the top of the housing 400, the button 410 may be disposed at the bottom of the housing 400, and the button 410 may also be disposed at the side of the housing 400, and preferably, the button 410 is disposed at a position that facilitates the hand holding the electrode surgical instrument 2000 and pressing the same.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A puncture needle is characterized by comprising a needle body, a protective sleeve and an opening and closing piece; wherein,

the needle body is provided with a puncture end, the protective sleeve is in sleeve fit with the needle body, and the opening-closing piece is arranged at one end of the protective sleeve, which is adjacent to the puncture end of the needle body;

the opening and closing piece has with the sealed butt of needle body supplies the first state that the puncture end of needle body stretches out, the opening and closing piece still has the needle body retracts to in the protective sheath and will the second state of protective sheath shutoff.

2. The needle of claim 1 wherein the opening element includes a plurality of closure blocks, the plurality of closure blocks being arranged in a ring, the plurality of closure blocks being deployed radially of the sheath when the opening element is in the first state, and the plurality of closure blocks being gathered radially of the sheath when the opening element is in the second state.

3. The needle of claim 2 wherein a plurality of said blocks are made of an elastic material, one end of each of said blocks is fixedly connected to said sheath, and the other end of each of said blocks extends to the axial position of said sheath.

4. A puncture needle according to claim 3, wherein a plurality of the closing blocks are further arranged along the axial extension of the protective sheath, so that the plurality of closing blocks together form a cone structure.

5. The needle of claim 1 wherein said needle body has a push-pull end distal to said piercing end, said push-pull end disposed generally beyond an end of said shield distal to said opening and closing member.

6. A puncture needle according to claim 5, wherein the push-pull end of the needle body is provided with a force application block.

7. The puncture needle according to claim 1, wherein the puncture end of the needle body is provided with two holding blocks arranged in parallel along the axial direction of the needle body, and ends of the two holding blocks, which are far away from the needle body, are arranged close to each other.

8. An electrode surgical instrument, characterized in that it comprises a housing, an electrode needle, a drive means and a puncture needle according to any one of claims 1 to 7; the electrode needle is arranged in the shell, a sliding channel with two open ends is arranged on the electrode needle, the puncture needle is movably arranged in the sliding channel, and a protective sleeve of the puncture needle is in clearance fit with the inner wall of the sliding channel; the driving device is arranged on the shell and used for driving the protective sleeve of the puncture needle to move so as to enable the protective sleeve to extend out of or retract into the electrode needle.

9. The electrode surgical instrument of claim 8, wherein the drive means includes a motor, a primary gear, and a secondary gear;

the motor is arranged on the shell, the main gear is connected with an output shaft of the motor, the pinion is rotatably arranged on the shell and meshed with the main gear, and a threaded hole is formed in the pinion in a penetrating manner along the thickness direction of the pinion;

the protruding guide post that is equipped with of periphery wall of protective sheath, the internal perisporium of electrode needle along its extending direction concave be equipped with guide post complex guide way, the guide post with guide way sliding connection, the protective sheath still be provided with screw hole screw-thread fit's screw thread section, motor drive the master gear drives the pinion rotates with the drive the protective sheath is in the axial of pinion upward movement.

10. The electrode surgical instrument of claim 8, wherein a button is further disposed on an outer surface of the housing, the button being electrically connected to the drive device, the button being configured to control operation of the drive device.