CN111227928A

CN111227928A - Injection device, snare and medical apparatus

Info

Publication number: CN111227928A
Application number: CN202010173973.0A
Authority: CN
Inventors: 李常青; 韦建宇; 沈正华; 冯明浩; 李宁; 奚杰峰; 唐志; 金鸿雁; 刘春俊
Original assignee: Micro Tech Nanjing Co Ltd
Current assignee: Micro Tech Nanjing Co Ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-06-05
Also published as: WO2021179863A1

Abstract

The embodiment of the invention provides an injection device, a snare and medical equipment, and relates to the technical field of medical instruments. The injection device comprises: the loop device comprises a tube body, a first shuttle channel and a second shuttle channel, wherein the tube body is provided with a first shuttle channel for the loop device to shuttle, and the distal end of the tube body is provided with a shuttle port for the loop of the loop device to penetrate out; the needle head is fixed at the distal end of the tube body; the protective sleeve is slidably sleeved on the tube body so as to cover the needle head inside or expose the needle head. When inserting the body in the human body, the syringe needle can the holding in the protecting tube, when needs inject through the syringe needle, the operation protecting tube can expose the syringe needle, the cooperation of protecting tube and body, and the activity space of syringe needle is big, can be so that the better stretching out of syringe needle, and it is comparatively convenient to go out the needle, and simultaneously, the syringe needle of also being convenient for annotates liquid, whole adaptability preferred to target tissue.

Description

Injection device, snare and medical apparatus

Technical Field

The invention relates to the technical field of medical instruments, in particular to an injection device, a snare and medical equipment.

Background

The snare is mainly used for cutting various polyps, redundant tissues and pathological changes in a body under an endoscope in cooperation with high-frequency electricity. Endoscopic Mucosal Resection (EMR) refers to a technique of injecting a drug into the submucosa of a lesion (e.g., sessile polyp, flat or superficial sunken polyp, leiomyoma, esophageal, gastric, colon early cancer, etc.) to form a liquid cushion and then cutting a large block of mucosal tissue. The method has the advantage that the focus can be cut under an endoscope without an operation. The traditional surgical method is divided into two steps:

the first step is as follows: the remote needle is first used to penetrate into the submucosa using the distal tip, the medication is injected through the proximal handle lumen to bulge the mucosa and the diseased tissue on the mucosa, and the needle is then withdrawn.

The second step is that: the snare is delivered to the lesion position through an endoscope channel, and the lesion tissue is removed by electrifying after being sleeved.

Conventional endoscopic submucosal resections (EMRs) require access to multiple conventional instruments to complete, respectively. At present, the common snare used clinically generally does not have the injection function, before the flat polyp is sleeved, a needle is needed to carry out submucosal injection to enable the mucosa to be raised, then the needle is withdrawn, and the snare is placed into the needle to carry out cutting, and the raising and cutting need to be repeatedly injected, injected and cut due to the fact that a plurality of lesions need to be cut. Therefore, different instruments need to be repeatedly operated to enter and exit the endoscopic forceps channel (endoscopic instrument working channel), which wastes a lot of time for doctors during the operation process and increases the medical burden of patients. In the related art, some snares with injection function exist, but the technical problems of inconvenient needle withdrawing and poor overall adaptability still exist.

Disclosure of Invention

Objects of the present invention include, for example, providing an injection device that facilitates needle withdrawal with overall greater flexibility.

The object of the invention is also to provide a snare which is easy to remove and has a good overall adaptability.

It is also an object of the present invention to provide a medical device which facilitates needle withdrawal and which is overall more flexible.

Embodiments of the invention may be implemented as follows:

embodiments of the present invention provide an injection device comprising:

a tube body having a first shuttle channel configured to shuttle a ferrule device, a distal end of the tube body defining a shuttle port through which a ferrule of the ferrule device passes;

a needle fixed to the distal end of the tube;

the protective sleeve is slidably sleeved on the tube body so as to coat the needle head inside or expose the needle head.

Optionally, the inner wall of the tube body is provided with a liquid injection channel, a distal end of the liquid injection channel penetrates through the distal end of the tube body to form a through port, and a proximal end of the liquid injection channel extends along the extending direction of the first shuttle channel; the needle is arranged at the through opening, and part of the needle protrudes relative to the far end of the tube body.

Optionally, the injection device further comprises a connector comprising a syringe and a first connector and a second connector connected to each other, the first connector being configured to be connected to the liquid supply device, the second connector being configured to be connected to the operation device;

the first joint is assembled with the proximal end of the tube body, the proximal end of the injection tube is communicated with the first joint, and the distal end of the injection tube is communicated with the liquid injection channel;

the second connector is provided with a second shuttle channel for shuttling the ferrule device, the second shuttle channel being in communication with the first shuttle channel;

wherein the manipulation device is coupled to the snare device and configured to move the snare device to shuttle within the body.

Optionally, the proximal end of the injection channel penetrates the proximal end of the tube body to form an insertion opening, and a portion of the injection tube is inserted into the injection channel through the insertion opening and fixed relative to the tube body.

Optionally, the injection device further comprises a heat shrink tube, the tube body is sleeved with the heat shrink tube, the heat shrink tube is located between the connector and the needle head, and the proximal end of the heat shrink tube is assembled with the connector.

Optionally, the injection device further comprises a push-pull member slidably sleeved on the tube body and connected with the protection sleeve to drive the protection sleeve to slide relative to the tube body.

Optionally, the push-pull member includes a sheath nut and a sheath screw, the sheath nut is slidably sleeved on the tube body, the sheath tube is fixed to the sheath nut, the sheath screw is slidably sleeved on the tube body, and a distal end of the sheath screw is in threaded fit with the sheath nut.

Optionally, a stop piece is arranged at the proximal end of the sheath tube, the stop piece is accommodated in the sheath nut and stopped by the inner wall of the sheath nut, and the distal end of the sheath screw extends into the sheath nut and abuts against the stop piece.

Optionally, the injection device further comprises a safety lock, the safety lock is matched with the tube body and stops the push-pull piece to limit the movement of the protective sleeve.

Optionally, the sheath screw is located on one side of the sheath screw, which is far away from the needle, the protection lock is detachably clamped with the tube body, and the clamping position is located on one side of the sheath screw, which is far away from the sheath nut; when the protective lock is clamped with the tube body, the far end of the protective lock is contacted with the near end of the sheath screw rod and stops the sheath screw rod, so that the protective sleeve keeps a state of coating the needle head.

Optionally, the protection lock comprises an operating part and a lock body in a tubular shape, and the operating part is connected with the outer wall of the lock body;

the lock body possesses the pipeline, the lock body be provided with the breach of pipeline intercommunication, the breach is followed the distal end of lock body is followed the axis of lock body runs through extremely the near-end of lock body, the lock body configures into to pass through the breach will the body card is gone into in the pipeline.

Optionally, the injection device further comprises a distal end fixing ring, the distal end fixing ring fixedly sleeving the distal end of the tube body.

Optionally, the needle is rod-shaped and extends in the axial direction of the tube.

Embodiments of the present invention also provide a snare comprising a snare device that slidably shuttles within the first shuttle channel, and an injection device as described above.

Optionally, the snare device includes a snare having two free ends fixed to a distal end of the pull cable, and a pull cable slidably shuttled in the first shuttle channel, a proximal end of the pull cable configured to be connected to an operation device.

Optionally, the snare further comprises an operation device connected to the tube, the operation device being connected to the pull cable and configured to drive the pull cable to shuttle within the tube.

Optionally, the operating device includes a core rod and an operating block, a distal end of the core rod is connected to the tube body, a proximal end of the cable is connected to the operating block, and the operating block is slidably connected to the core rod to drive the cable to shuttle in the tube body.

Optionally, the operation device further comprises an electrode base and an electrode;

the electrode base with the operation piece is fixed, the electrode base with the electrode is connected, the near-end of cable with the electrode base is connected.

Optionally, the operation device further comprises a connection ring and a connection cap;

the connecting ring and the connecting cap are relatively fixed and are sleeved with the pull cables, the connecting cap is connected with the pipe body, and the far end of the core rod is connected with the connecting cap.

Optionally, the operating device further includes a limiting block slidably connected to the core bar and fixable with respect to the core bar, and the limiting block is configured to contact with the operating block to stop the operating block.

Embodiments of the present invention also provide a medical device comprising a liquid supply device configured to supply liquid to the needle, a power supply device configured to supply power to the ferrule, and a snare as described above.

The injection device, snare and medical apparatus of the embodiments of the present invention have beneficial effects including, for example:

the snare device may be shuttled through the tube, and the snare of the snare device may be passed out through the shuttle port, i.e., resection of the target tissue may be achieved. The syringe needle is fixed on the distal end of body, and, the protective sheath when sliding for this body, can be with the syringe needle cladding, promptly, when inserting the body in the human body, the syringe needle can the holding in the protective sheath, when needs inject through the syringe needle, the operation protective sheath can expose the syringe needle, the cooperation of protective sheath and body, the activity space of syringe needle is big, can be so that the better stretching out of syringe needle, it is comparatively convenient to go out the needle, simultaneously, the syringe needle of also being convenient for annotates the liquid to target tissue, whole adaptability preferred.

The snare comprises the injection device, which has the full functionality of the injection device.

A medical device includes the snare, which has all of the functions of the snare.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a medical apparatus provided in this embodiment;

FIG. 2 is a schematic view of the snare according to the present embodiment shown in a first perspective;

FIG. 3 is a schematic structural view of the snare of the present embodiment from a second perspective;

FIG. 4 is an exploded view of the snare according to the present embodiment;

FIG. 5 is a schematic view from a first perspective of the assembly of the tube body and the sheath tube in the snare;

FIG. 6 is a schematic view from a second perspective of the assembly of the tube body and the sheath tube in the snare;

FIG. 7 is a schematic view of a needle in the snare;

FIG. 8 is a cross-sectional view of the tube in the snare;

FIG. 9 is a schematic view of the push-pull member in the snare from a first perspective;

FIG. 10 is a schematic view of the push-pull member in the snare from a second perspective;

FIG. 11 is a schematic view of a protective lock in the snare;

FIG. 12 is a schematic view of a joint in a snare at a first perspective;

FIG. 13 is a schematic view of the joint in the snare at a second perspective;

FIG. 14 is a schematic view of the manipulation device in the snare;

FIG. 15 is a schematic view of the attachment cap in the snare;

fig. 16 is a schematic view of a core rod in a snare.

Icon: 100-a snare; 10-an injection device; 11-a tube body; 111-a first shuttle channel; 112-shuttle port; 113-a liquid injection channel; 114-a through-opening; 115-insertion opening; 12-a needle head; 121-a first puncture surface; 122-a second puncture side; 123-a third puncture surface; 13-sheathing tube; 131-a stop sheet; 14-a linker; 141-a first joint; 142-a second joint; 1421 — second shuttle channel; 15-injection tube; 16-heat shrink tubing; 17-a push-pull member; 171-a sheath nut; 1711-wing section; 172-sheath screw; 1721-a stop block; 18-a dongle; 181-a lock body; 1811-a pipe; 1812-gap; 182-an operation part; 19-distal fixation ring; 20-a ferrule arrangement; 21-a ferrule; 22-a pull cable; 23-riveting the tube; 30-an operating device; 31-a connecting ring; 32-a connecting cap; 321-a projection; 322-an arc-shaped block; 33-core rod; 330-a chute; 331-a ring groove; 332-scale mark; 333-a first ring; 34-an operation block; 341-block body; 342-a second finger ring; 343-a third ring; 344-a stationary cartridge; 35-an electrode base; 36-an electrode; 37-a limiting block; 371-the clamping part; 200-a liquid supply device; 300-power supply means.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

In the related art, when it is desired to resect a target tissue (e.g., a flat polyp), the associated instruments are typically required to enter the body through an endoscopic forceps channel.

In one mode, the submucosa of the lesion tissue can be injected by injection to bulge the mucosa, and then the injection needle can be withdrawn and a common snare without injection function can be inserted for cutting. The method can operate different instruments, the operation process is complicated, time and labor are consumed, and the medical burden of a patient is increased.

In another mode, the operation can also be carried out by directly placing a snare with the injection function, namely, the operation is carried out by injecting liquid firstly and then cutting. Although this method is relatively simple, there are technical problems of inconvenient needle extraction and poor overall adaptability. The present embodiment provides an injection device, a snare and a medical apparatus which can effectively alleviate the technical problem, and particularly, the structure will be described in detail below.

In this embodiment, fig. 1 is a schematic structural diagram of a medical device provided in this embodiment. Fig. 2 and 3 are schematic views of the snare 100 from different perspectives. Fig. 4 is an exploded view of the snare 100. Fig. 5-16 are schematic views of the components of the snare 100.

It should be noted that as will be understood by those skilled in the art, throughout the use of the snare 100, the leading end of the snare 100 will extend into the body and the trailing end of the snare 100 will be manipulated by the physician. Thus, in contrast, the portion of each component near the front of the snare 100 is referred to as the distal end of the component, and the portion of the component near the rear of the snare 100 is referred to as the proximal end of the component. In fig. 2 and 3, the various parts of the snare 100 are shown generally in sequence in fig. 5-16, in the direction from the distal end to the proximal end of the snare 100.

Referring to fig. 1, the present embodiment provides a medical apparatus, which includes a liquid supply device 200, a power supply device 300 and a snare 100, wherein the liquid supply device 200 is configured to supply liquid to a needle 12 (shown in fig. 4) of the snare 100, and the power supply device 300 is configured to supply power to a loop 21 (shown in fig. 4) of the snare 100. That is, the snare 100 according to the present embodiment has not only a function of cutting the target tissue but also a function of injecting the target tissue.

The power supply 300 supplies a high frequency current to act on the target tissue through the ferrule 21 to cut the target tissue. The liquid supply device 200 may employ a pressure pump for injection to supply liquid to the needle 12, so that the target tissue can be injected to bulge before cutting the target tissue, and can be flushed through the needle 12 after the cutting of the target tissue is completed. The power supply device 300 and the liquid supply device 200 are conventional and will not be described herein. The snare 100 of this embodiment will be described in detail below.

Referring to fig. 2 and 3, the snare 100 comprises an injection device 10, a snare device 20, and an operation device 30. The injection device 10 cooperates with the liquid supply device 200 to primarily inject liquid into a target tissue. The snare device 20 is slidably shuttled in a first shuttle channel 111 (described in detail below) of the injection device 10, and the snare device 20 is mainly used for sheathing a target tissue. The operation device 30 is cooperated with the power supply device 300, and mainly functions to control the operation of the snare device 20 under the operation of the doctor, and the power supply device 300 supplies power to the snare 21 of the snare device 20 so as to perform the cutting of the target tissue.

Referring to fig. 4-8, the injection device 10 includes:

a tube 11, the tube 11 having a first shuttle channel 111 configured to shuttle the ferrule device 20, and a distal end of the tube 11 having a shuttle port 112 for the ferrule 21 of the ferrule device 20 to pass through.

A needle 12, the needle 12 being fixed to the distal end of the tube 11.

The sheath tube 13, the sheath tube 13 slidably covers the tube body 11 to cover the needle 12 therein or to expose the needle 12.

It should be noted that the needle 12 is mounted on the tubular body 11, fixed with respect to the tubular body 11, so that the tubular body 11 has at least two functions. That is, after the tube 11 is introduced into the snare device 20, the target tissue can be cut by performing a sheathing operation with the loop 21 energized. Meanwhile, the needle 12 of the tube 11 can be used for puncturing and injecting liquid into the target tissue under the operation of the doctor after the liquid supply device 200 is externally connected.

The sheath tube 13 may be operated by a doctor to cover or expose the needle 12 mounted on the distal end of the tube body 11. As can be known to those skilled in the art, when the needle 12 is covered by the sheath tube 13, the tube 11 can effectively shuttle in the endoscopic forceps channel, and when moving to the vicinity of the target tissue, the doctor can operate the sheath tube 13 to move the sheath tube 13 to the proximal end, and at this time, the needle 12 is not covered by the sheath tube 13, and is in an exposed state, and the tube 11 is pushed to the distal end, so that the needle 12 on the tube 11 can be pierced into the target tissue.

It will be appreciated that the snare device 20 can be shuttled through the body 11 and that the snare 21 of the snare device 20 can be passed out through the shed 112, i.e. resection of the target tissue can be effected. Syringe needle 12 is fixed on the distal end of body 11, and, protecting tube 13 is when sliding for this body 11, can be with syringe needle 12 cladding, namely, when inserting body 11 in the human body, syringe needle 12 can the holding in protecting tube 13, when needs inject through syringe needle 12, doctor's operation protecting tube 13, can expose syringe needle 12, protecting tube 13 and body 11's cooperation, syringe needle 12's activity space is big, can be so that the better stretching out of syringe needle 12, it is comparatively convenient to go out the needle and annotate the liquid, and simultaneously, also be convenient for syringe needle 12 to target tissue carry out, whole adaptability preferred. The injection device 10 is compact in overall construction, small in size, and low in manufacturing cost. Typically, the needle 12 is contained within a sheath 13 to protect the endoscopic tract from damage while the injection device 10 is being shuttled therethrough.

It is understood that the sheath tube 13 may be a conventional tube having only one lumen to serve as the sheath tube 11, and in other embodiments, the sheath tube 13 may have a plurality of lumens, i.e., the sheath tube 13 may be a multi-lumen tube, wherein one main lumen is configured to be the sheath tube 11, and the remaining lumens may be configured to be used for injection or insertion of other devices.

With reference to fig. 5 and 6, in this embodiment, the inner wall of the tube 11 is provided with a liquid injection channel 113, a distal end of the liquid injection channel 113 penetrates through the distal end of the tube 11 to form a through port 114, and a proximal end of the liquid injection channel 113 extends along the extending direction of the first shuttle channel 111 (it can also be understood that the liquid injection channel 113 and the first shuttle channel 111 are arranged side by side); the needle 12 is mounted in the through opening 114 with a portion of the needle 12 projecting relative to the distal end of the barrel 11.

Part of the needle 12 is accommodated in the liquid injection channel 113 through the through opening 114, and the external liquid supply device 200 supplies liquid to the liquid injection channel 113 to realize the liquid outflow from the needle 12. Since the needle 12 is fixedly mounted directly to the body 11, its length can be reduced as much as possible, for example, its length can be reduced to within 5mm, and the injection device 10 has better flexibility and overbending performance as a whole, regardless of whether the needle 12 is covered by the sheath 13.

Referring to fig. 5 and 6, in the present embodiment, the injection device 10 further includes a distal fixing ring 19, and the distal fixing ring 19 is fixedly sleeved on the distal end of the tube 11. The distal end fixing ring 19 can play a role in reinforcing the distal end of the tube body 11, and the service life of the tube body can be effectively prolonged.

Referring to fig. 6 and 7, in the present embodiment, the needle 12 is rod-shaped and extends in the axial direction of the tube 11. The proximal end of the needle 12 is mounted in the through-opening 114, for example by means of an interference fit, or by means of gluing. With reference to fig. 7, the first puncture surface 121, the second puncture surface 122, and the third puncture surface 123 are formed at the distal end of the needle 12, and the puncture efficiency can be improved by this arrangement.

In this embodiment, the needle 12 is a straight rod, and the length direction of the needle 12 is parallel to the axial direction of the tube 11. Meanwhile, in this embodiment, the position of the needle 12 is eccentrically arranged, that is, it is not on the axis of the tube 11, and in other embodiments, the needle 12 may be coaxially arranged with the tube 11.

Referring to fig. 8, the tube 11 may be manufactured by injection molding, i.e., the first shuttle passage 111 is formed in the tube 11, and the liquid injection passage 113 is formed in a partially thick inner wall of the tube 11. Optionally, a first shuttle channel 111 extends through the distal and proximal ends of the tube 11, and a liquid injection channel 113 extends through the distal and proximal ends of the tube 11.

In this way, since the needle 12 is directly fixed to the tube 11, the outer diameter of the needle 12 can be made larger, and at the same time, the outer diameter of the tube 11 can be made smaller.

In addition, compared with some snares with injection function in the prior art (the needle in the snare is arranged in a shuttling manner), in the embodiment, the needle 12 is directly fixed on the tube body 11, and the needle can be discharged through the protective sleeve 13, and the needle 12 is easy to discharge due to the relatively large inner diameter of the protective sleeve 13, that is, the needle discharge cavity is large. In other words, in the case where the use environment is not straight as a whole, the large needle discharge channel is easier to discharge than the small needle discharge channel.

In the prior art, generally, a large needle outlet cavity channel needs to be formed, the outer diameter of a tube for covering the needle is made larger, and therefore the inconvenience of shuttling in an endoscope channel is inevitably caused. If the needle is designed as a stainless steel needle tube, although the needle can pass through an endoscopic forceps channel, the overbending performance is sacrificed, i.e., the overbending performance is poor.

In this embodiment, the injection device 10 has a smaller overall outer diameter, and the injection passage 113 and the needle head 12 having a larger inner diameter can be ensured at the same time, that is, the injection flow rate is ensured, the injection efficiency is improved, the target tissue swelling time is shortened, the overbending performance can be ensured, and the needle discharge is smooth.

Referring to fig. 9-11 in combination with fig. 4, in the present embodiment, the injection device 10 further includes a push-pull member 17, and the push-pull member 17 is slidably sleeved on the tube body 11 and connected to the sheath tube 13 to drive the sheath tube 13 to slide relative to the tube body 11.

This push-and-pull 17 is equivalent to the effect of handle, and when in the user state, the distal end of body 11 stretched into the human body in, this push-and-pull 17 is located the human body outward to the doctor can operate push-and-pull 17, drives the action of protecting pipe 13.

Referring to fig. 9 and 10, in the present embodiment, the push-pull member 17 includes a sheath nut 171 and a sheath screw 172, the sheath nut 171 is slidably disposed on the tube body 11, the sheath tube 13 is fixed to the sheath nut 171, the sheath screw 172 is slidably disposed on the tube body 11, and a distal end of the sheath screw 172 is in threaded engagement with the sheath nut 171.

It can be understood that the sheath nut 171 can be fixed to the sheath tube 13 by means of gluing, clamping, etc., the sheath screw 172 is screwed to the sheath nut 171, the plurality of wing portions 1711 are convexly arranged on the outer wall of the sheath nut 171, and the outer wall of the sheath screw 172 is provided with anti-slip threads, which all can play a role of anti-slip, so as to facilitate the operation of a doctor.

In this embodiment, the push-pull member 17 is composed of two components, i.e. the sheath nut 171 and the sheath screw 172, in other embodiments, the push-pull member 17 may be only one component, e.g. cylindrical, triangular, etc., which is sleeved on the tube body 11 and fixedly connected to the sheath tube 13, or the push-pull member 17 itself may be a protrusion on the proximal end of the sheath tube 13 for the doctor to hold.

Referring to fig. 10, specifically, the proximal end of the sheath tube 13 is provided with a stop piece 131, the stop piece 131 is accommodated in the sheath nut 171 and stopped by the inner wall of the sheath nut 171, and the distal end of the sheath screw 172 extends into the sheath nut 171 and abuts against the stop piece 131.

When the sheath nut 171 is inserted from the distal end of the tube 11 and then moved proximally along the tube 11, when the stopper 131 is moved to be contacted by the inner wall of the sheath nut 171, the sheath screw 172 is installed, the sheath screw 172 is assembled with the sheath nut 171 by means of screw-thread fit, and when the distal end of the sheath screw 172 is abutted to the stopper 131, the installation of the push-pull member 17 is completed. Meanwhile, the outer wall of the sheath screw 172 is also provided with a stop block 1721 in a protruding manner, and after the sheath screw is installed in place, the stop block 1721 is in contact with the proximal end of the sheath nut 171.

Referring to fig. 11 in conjunction with fig. 4, in the present embodiment, the injection device 10 further includes a protection lock 18, and the protection lock 18 is engaged with the tube 11 and stops the push-pull member 17 to limit the movement of the sheath 13. Proximal movement of the sheath tube 13 may be restricted by the dongle 18.

Specifically, the sheath screw 172 is located on a side of the sheath screw 172 away from the needle 12, the protection lock 18 is detachably engaged with the tube 11, and the engaged position is located on a side of the sheath screw 172 away from the sheath nut 171; when the protector lock 18 engages with the tube body 11, the distal end of the protector lock 18 contacts the proximal end of the sheath screw 172, and stops the sheath screw 172 so that the sheath tube 13 is in a state covering the needle 12.

When the dongle 18 is engaged with the tube 11, the distal ends of the dongle 18 are engaged with the sheath screw 172 but not connected to each other. The existence of the protection lock 18 can reduce the probability of misoperation of a doctor. Generally, when the distal end of the tube 11 is inserted into the human body, the protector lock 18 is always engaged with the tube 11, and the distal end of the protector lock 18 stops the sheath screw 172 so that the sheath tube 13 covers the needle 12. When the injection operation is required, the doctor removes the protector lock 18, holds the sheath nut 171 or the sheath screw 172, and moves the same to the proximal end, and exposes the needle 12 covered with the sheath tube 13, and at this time, can operate the tube body 11 to pierce the needle 12 into the target tissue.

Referring to fig. 11, in particular, the protection lock 18 includes an operating portion 182 and a lock body 181 having a tubular shape, and the operating portion 182 is connected to an outer wall of the lock body 181. The lock body 181 includes a tube 1811, the lock body 181 has a notch 1812 communicating with the tube 1811, the notch 1812 extends from the distal end of the lock body 181 to the proximal end of the lock body 181 along the axis of the lock body 181, and the lock body 181 is configured to snap the tube 11 into the tube 1811 through the notch 1812.

It can be understood that, referring to the relative position shown in fig. 11, the doctor can hold the operation portion 182 and move it vertically, so that the tube 11 can be inserted into the tube 1811 through the notch 1812, and the protection lock 18 can be engaged with the tube 11. The outer wall of the operation portion 182 is uneven, so that friction force can be increased, and operation by a doctor is facilitated.

Alternatively, the protective lock 18 selected in other embodiments may not be detachable with respect to the tube 11, for example, the protective lock 18 is always sleeved on the tube 11, and may be in the shape of a sheet or a cylinder, as long as the push-pull member 17 can be stopped.

Referring to fig. 12 and 13 in combination with fig. 4, in the present embodiment, the injection device 10 further includes a connector 14, the connector 14 includes an injection tube 15 and a first connector 141 and a second connector 142 connected to each other, the first connector 141 is configured to be connected to the liquid supply device 200, and the second connector 142 is configured to be connected to the operation device 30.

A first adapter 141 is fitted to the proximal end of the body 11, the proximal end of the syringe 15 communicates with the first adapter 141, and the distal end of the syringe 15 communicates with the injection channel 113.

The second connector 142 is provided with a second shuttle channel 1421 for shuttling the ferrule device 20, the second shuttle channel 1421 being in communication with the first shuttle channel 111.

Wherein the handling device 30 is connected to the snare device 20 and is configured to move the snare device 20 back and forth within the tube 11.

The first connector 141 and the second connector 142 are integrally formed at the distal end of the connector 14, and the distal end of the connector 14 is fixedly assembled with the proximal end of the tube body 11, so that the cable 22 (described in detail below) of the snare device 20 that is shuttled in the tube body 11 can pass through the second shuttle passage 1421 and can be connected to the operation device 30, so that the physician can control the cable 22 through the operation device 30. Meanwhile, the injection tube 15 is used for communicating the first connector 141 and the liquid injection channel 113, and after the external liquid supply device 200 is assembled with the first connector 141, liquid is supplied to the liquid injection channel 113 through the first connector 141, so that the liquid can flow out of the needle 12.

The fitting 14 corresponds to a three-way device, which can be understood as a luer fitting. Alternatively, the joint 14 (second joint 142) may be integrally formed with the distal end of the operation device 30, or may be fixed by welding. That is, the second connector 142 may not be an actual connector, but merely a portion of the connector 14.

It should be noted that in other embodiments, only one connector, i.e., only the second connector 142, may be retained, and the second connector 142 may be connected to the operation device 30. At this time, the first connector 141 is not present, and the proximal end of the syringe 15 can be exposed by opening a hole on the outer wall of the second connector 142, a male connector can be mounted on the proximal end of the syringe 15, and a female connector is mounted on the injection end of the liquid supply device 200 (e.g., injection needle), and the male connector is threadedly engaged with the female connector to realize liquid supply. Thus, since the injection tube 15 can be made of a flexible material, i.e., it is a flexible tube, the position of the injection end of the liquid supply apparatus 200 can be easily adjusted.

Referring to fig. 4 and 12, in this embodiment, the proximal end of injection channel 113 extends through the proximal end of tube 11 to form insertion opening 115, and a portion of syringe 15 is inserted into injection channel 113 through insertion opening 115 and fixed relative to tube 11.

The injection tube 15 is partially inserted into the injection channel 113, and can be fixed in an interference fit and bonding manner, so that the sealing performance of injection can be improved, and liquid leakage can be avoided.

Referring to fig. 4, in this embodiment, the injection device 10 further includes a heat shrinkable tube 16, the heat shrinkable tube 16 is sleeved on the tube body 11, the heat shrinkable tube 16 is located between the connector 14 and the needle 12, and the proximal end of the heat shrinkable tube 16 is assembled with the connector 14.

The heat shrinkable tube 16 may further improve the sealing effect, and particularly, the proximal end of the heat shrinkable tube 16 is glued to the distal end of the joint 14. The distal end of the heat shrinkable tubing 16 may contact the proximal end of the shield 18 when the shield 18 is snapped onto the body 11.

Referring to fig. 14-16 in conjunction with fig. 4, in particular, the snare device 20 includes a snare 21 and a pull cable 22, two free ends of the snare 21 are fixedly connected to a distal end of the pull cable 22, the pull cable 22 slidably shuttles in the first shuttle channel 111, and a proximal end of the pull cable 22 is configured to be connected to the operation device 30.

In this embodiment, the ferrule device 20 further includes a riveting tube 23, and the riveting tube 23 is riveted at a position where both free ends of the ferrule 21 are fixedly connected to the distal end of the cable 22, so as to connect the cable 22 to the ferrule 21.

Alternatively, the two free ends of the ferrule 21 may be fixed to the cable 22 by welding. When the target tissue needs to be sleeved, the ferrule 21 extends out of the tube body 11 through the shed 112, the pulling cable 22 is shuttled in the first shuttle channel 111, the proximal end of the pulling cable 22 is connected with the operating device 30, and the electrode 36 is connected with the external power supply device 300. The power supply device 300 supplies power to the electrode 36, supplies power to the snare 21 through the pull cord 22, and cuts the target tissue after the snare 21 is electrified.

In this embodiment, the ferrule 21 is equivalent to the cutting function by energization, but in other embodiments, the ferrule 21 may be cut directly without energization, or the cutting function may be realized without the electrode 36, the power supply device 300, or the like.

Referring to fig. 4 and 14, in the present embodiment, the snare 100 further includes an operation device 30, the operation device 30 is connected to the tube 11, and the operation device 30 is connected to the pull cable 22 and configured to move the pull cable 22 to shuttle in the tube 11.

The operating device 30 is secured to the proximal end of the connector 14 as described above and primarily effects operation of the cable 22.

In this embodiment, the operation device 30 includes a core rod 33 and an operation block 34, a distal end of the core rod 33 is connected to the tube 11, a proximal end of the cable 22 is connected to the operation block 34, and the operation block 34 is slidably connected to the core rod 33 to move the cable 22 through the tube 11.

Specifically, the operation device 30 further includes a connection ring 31, a connection cap 32, an electrode base 35, and an electrode 36. The connecting ring 31 and the connecting cap 32 are relatively fixed and are all sleeved with the pulling cable 22, the connecting cap 32 is connected with the tube body 11, and the distal end of the core rod 33 is connected with the connecting cap 32. The electrode base 35 is fixed to the operation block 34, the electrode base 35 is connected to the electrode 36, and the proximal end of the pull cord 22 is connected to the electrode base 35 after passing through the connection ring 31 and the connection cap 32.

It should be noted that the connection ring 31 may be made of an elastic material, and after the assembly is completed, the connection ring 31 may serve as an auxiliary locking function for the connection cap 32. At the same time, the connection ring 31 prevents the liquid at the distal end from flowing back to the proximal hand-held portion therethrough, causing electrical leakage.

Alternatively, the electrode base 35 may not be fixed to the operating block 34, for example, to the connecting cap 32, which is in sliding contact with the cable 22 to supply power to the cable 22.

Alternatively, the connection ring 31 and the connection cap 32 may be integrally formed, and the connection ring 31 and the connection cap 32 may perform a certain sealing function, or the connection ring 31 and the connection cap 32 may not perform a sealing function and may only perform the functions of the connection joint 14 (the second joint 142) and the stem 33. In other embodiments, the connection ring 31 and the connection cap 32 may be omitted, and the second connector 142 may be integrally formed with the stem 33.

In this embodiment, the distal end of the connecting cap 32 has an internal thread, the proximal end of the connector 14 (the second connector 142) has an external thread, and the two are in threaded engagement, referring to fig. 15, the distal end of the connecting cap 32 has a protrusion 321, the connecting ring 31 is stopped by the protrusion 321 inside the proximal end of the connector 14, referring to fig. 4, an arc-shaped block 322 is disposed on the inner wall of the proximal end of the connecting cap 32, referring to fig. 16, the distal end of the core rod 33 has an annular groove 331, the connecting cap 32 is fitted over the distal end of the core rod 33, and the arc-shaped block 322 is slidably disposed in the annular groove 331, so that the connecting cap 32 can rotate with respect to the core rod 33, that is, the doctor can fix the connecting cap 32 with the left hand and rotate the core rod 33 with.

Referring to fig. 4 and 14, the core rod 33 is provided with a sliding slot 330 with an opening at one side, the proximal end of the cable 22 is arranged in the sliding slot 330, and the operation block 34 comprises a block 341, a second finger ring 342, a third finger ring 343 and a fixed cylinder 344. The block body 341 is slidably sleeved on the core rod 33, the second finger ring 342 and the third finger ring 343 are respectively fixed on two opposite sides of the block body 341, the fixed cylinder 344 is fixed on the block body 341, the electrode base 35 is fixed in the fixed cylinder 344 and is connected and fixed with the cable 22, the electrode 36 is in threaded fit with the electrode base 35, and one end of the electrode 36 extends out relative to the cylinder opening of the fixed cylinder 344. When the doctor operates the second finger ring 342 and the third finger ring 343, the block 341 can move relative to the core rod 33 and drive the cable 22 to move. Referring to fig. 14 and 16, the core rod 33 is provided with a scale 332, the position of the cable 22 and thus the position of the loop 21 can be determined by the relative position of the scale 332 and the operation block 34, and the proximal end of the core rod 33 is provided with a first finger ring 333 for facilitating the operation of a doctor. With reference to fig. 4 and 14, the operating device 30 further includes a stopper 37, the stopper 37 is slidably connected to the core bar 33 and can be fixed relative to the core bar 33, and the stopper 37 is configured to contact the operating block 34 to stop the operating block 34.

The limiting block 37 is provided with an engaging portion 371 which is engaged with the sliding groove 330, the limiting block 37 can contact with the operation block 34, so as to stop the operation block 34, when the cable 22 is not required to be operated, the limiting block 37 stops the operation block 34, so as to stop the cable 22, and further, the position of the ferrule 21 is stopped.

According to the snare 100 provided by the present embodiment, the operation of the snare 100 is:

when the device works, the distal end of the snare 100 is integrally led through an endoscopic forceps channel and is placed near a target tissue, then the protective lock 18 is detached, the sheath nut 171 is moved towards the proximal end, the sheath nut 171 drives the connected sheath tube 13 to move towards the proximal end, the needle head 12 covered by the sheath tube 13 is exposed, then the needle head 12 is pressed against the target tissue with force, the needle head 12 enters the target tissue, and then the connector 14 is connected with the liquid supply device 200 for injection. After the target tissue is raised, the sheath nut 171 is operated, the needle 12 is retracted into the sheath tube 13, the ferrule 21 extends out of the sheath tube 13, the ferrule 21 is sleeved at the root of the target tissue, the operation block 34 is pulled, the ferrule 21 is tightened through the pull cable 22, the electrode 36 is connected with the power supply device 300, and the ferrule 21 is electrified to cut the target tissue. After cutting, the liquid can be injected again through the liquid supply device 200, and the needle 12 sprays out of the water column, so that the wound can be further washed.

The snare 100 has the functions of injection, cutting and flushing, and has good bending performance and adaptability, thereby greatly saving the operation time and cost.

In summary, the embodiments of the present invention provide an injection device 10, a snare 100 and a medical apparatus, wherein a loop device 20 can be shuttled through a tube 11, and a loop 21 of the loop device 20 can be passed out through a shed 112, i.e. the target tissue can be cut. Needle 12 is fixed on the distal end of body 11, and, protective sheath 13 is when sliding for this body 11, can be with needle 12 cladding, namely, when inserting body 11 in the human body, needle 12 can the holding in protective sheath 13, when needs inject through needle 12, operation protective sheath 13, can expose needle 12, protective sheath 13 and body 11's cooperation, needle 12's activity space is big, can be so that the better stretching out of needle 12, it is comparatively convenient to go out the needle, and simultaneously, the needle 12 of also being convenient for injects the liquid to the target tissue, whole adaptability preferred.

The snare 100 comprises the injection device 10, which has the full functionality of the injection device 10.

The medical device comprises the snare 100, which has the full functionality of the snare 100.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An injection device, comprising:

a needle fixed to the distal end of the tube;

2. The injection device as claimed in claim 1, wherein the inner wall of the tube body is provided with a liquid injection channel, a distal end of the liquid injection channel penetrates through the distal end of the tube body to form a through port, and a proximal end of the liquid injection channel extends along an extending direction of the first shuttle channel; the needle is arranged at the through opening, and part of the needle protrudes relative to the far end of the tube body.

3. The injection device of claim 2, further comprising a connector comprising a syringe and interconnected first and second connectors, the first connector configured to connect with a liquid supply and the second connector configured to connect with an operating device;

4. The injection device of claim 3, wherein the proximal end of the injection channel extends through the proximal end of the tube to form an insertion opening through which a portion of the injection tube is inserted into the injection channel and fixed relative to the tube.

5. The injection device of claim 3, further comprising a heat shrink tubing sleeved over the tube, the heat shrink tubing positioned between the fitting and the needle, a proximal end of the heat shrink tubing fitting with the fitting.

6. The injection device as claimed in any one of claims 1 to 5, further comprising a push-pull member slidably sleeved around the tubular body and connected to the sheath tube for sliding the sheath tube relative to the tubular body.

7. The injection device as defined in claim 6, wherein the push-pull member includes a sheath nut slidably disposed around the tube body and a sheath screw slidably disposed around the tube body, the sheath screw being threadedly engaged with the sheath nut.

8. The injection device as claimed in claim 7, wherein the sheath tube is provided at a proximal end thereof with a stop tab, the stop tab is received in the sheath nut and stopped by an inner wall of the sheath nut, and a distal end of the sheath screw extends into the sheath nut and abuts against the stop tab.

9. The injection device as defined in claim 7, further comprising a safety latch that engages the body and stops the push-pull member to limit movement of the sheath.

10. The injection unit of claim 9, wherein the sheath screw is located on a side of the sheath screw remote from the needle, the boot detachably engaging the tube at a location on a side of the sheath screw remote from the sheath nut; when the protective lock is clamped with the tube body, the far end of the protective lock is contacted with the near end of the sheath screw rod and stops the sheath screw rod, so that the protective sleeve keeps a state of coating the needle head.

11. The injection device as defined in claim 10, wherein the protective lock comprises a lock body in the shape of a tube and an operating portion, the operating portion being connected to an outer wall of the lock body;

12. The injection device as defined in any one of claims 1-5, further comprising a distal securing ring fixedly sleeved over the distal end of the tube.

13. An injection device according to any of claims 1 to 5, wherein the needle is rod-shaped and extends axially of the body.

14. A snare comprising a snare device and the injection device of any one of claims 1-13, the snare device slidably shuttled within the first shuttle channel.

15. A snare according to claim 14, wherein the snare device includes a snare having both free ends secured to a distal end of a pull cable, and a pull cable slidably shuttled within the first shuttle channel, a proximal end of the pull cable configured to connect to an operating device.

16. A snare according to claim 15, further comprising an operating device connected to the tube, the operating device being connected to the pull cable and configured to move the pull cable back and forth within the tube.

17. A snare according to claim 16, wherein the actuation device includes a core rod having a distal end connected to the body, and an actuation block having a proximal end connected to the actuation block, the actuation block being slidably connected to the core rod to cause the actuation cable to shuttle within the body.

18. A snare according to claim 17, wherein the manipulation device further includes an electrode base and an electrode;

19. A snare according to claim 17, wherein the manipulation device further includes a connection ring and a connection cap;

20. A snare according to claim 17, wherein the operating device further includes a stop block slidably connected to the core bar and fixable relative to the core bar, the stop block configured to contact the operating block to stop the operating block.

21. A medical device comprising a liquid supply means configured to supply liquid to the needle, a power supply means configured to supply power to the collar, and a snare of any one of claims 14-20.