CN209018931U - A kind of snare with V-shaped part - Google Patents

Abstract

The utility model discloses a kind of snares with V-shaped part, snare includes the emission electrode and loop electrode of front bar, the pipe sheath extended from front bar and the top that pipe sheath is arranged in, emission electrode and loop electrode are electrically connected to radio-frequency generator via conducting wire, wherein, emission electrode forms closed snare cutter head around objective body, the end of snare cutter head is formed towards the V-shaped part of snare cutter head inner opening, and the top of the V-shaped part is formed as spherical.

Description

A snare with a V-shaped portion

technical field

The utility model relates to a snare with a V-shaped part.

Background technique

For example, a snare is known, which is used in conjunction with an endoscope to treat diseases such as digestive tract, urinary tract, and respiratory tract. The electrical energy excites the conductive medium to generate plasma, and the target body is subjected to vaporization and snare cutting based on the radio frequency energy of the plasma, so as to remove polyps or other redundant body tissues in the digestive tract. It can avoid the risks of traditional surgical treatment, and has the characteristics of small trauma, good curative effect and high surgical technical requirements. A snare is an electrosurgical instrument that replaces a mechanical scalpel for tissue snare cutting. Compared with the traditional mechanical scalpel, the snare can greatly shorten the operation time, reduce the patient's blood loss and blood transfusion volume, and reduce the complications and operation costs.

The snare includes a transmitting electrode and a return electrode, the transmitting electrode is telescopically arranged in the tube sheath of the snare, and the return electrode is wound around the end of the tube sheath, wherein, in the state that the transmitting electrode is pushed out of the tube sheath by a push rod Then, the transmitting electrode forms a closed snare cutter head around the target body, so that the target body can be vaporized and snare cut by the snare cutter head when the two electrodes are energized. However, in practice, the target body may be formed into a different shape, and when the shape does not correspond to the shape of the snare tip of the snare, the snare tip may not be able to wrap the target body, resulting in failure of the snare. Even if the target body can be trapped, the doctor needs to continuously operate the snare, which increases the workload of the doctor and prolongs the operation time.

Utility model content

The present invention is made in view of the above problems and provides a snare with a V-shaped portion, which can reliably wrap a target body for vaporization snare cutting, thereby reducing the workload of doctors and shortening the operation time.

A snare with a V-shaped portion according to the present invention includes a front rod, a sheath extending from the front rod, and a transmitting electrode and a return electrode disposed at the tip of the sheath, and the transmitting electrode and the return electrode are electrically connected to a high-frequency generator via a wire , wherein the emitter electrode forms a closed snare cutter head around the target body, the end of the snare cutter head is formed as a V-shaped portion that opens toward the inside of the snare cutter head, and the top of the V-shaped portion is formed into a spherical shape.

With the above configuration, when vaporized snare cutting is performed using the snare having the V-shaped portion, the snare tip formed by the emitter electrode can easily abut against the tissue around the target body (for supporting the snare using the V-shaped portion) On the part of the snare cutter head), when the snare cutter is further inwardly inserted, the snare cutter head is deformed into a shape corresponding to the target body through the V-shaped portion. Therefore, the target body can be reliably sheathed by the deformed shape, and the vaporization trap cutting can be completed. As a result, the snare according to the present invention can reliably perform vaporization snare cutting on target bodies of different shapes. In addition, since the top of the V-shaped portion is formed into a spherical shape, the V-shaped portion will not penetrate into human tissue and cause unnecessary damage to the human body.

Preferably, according to the snare having a V-shaped portion of the present invention, the tip of the V-shaped portion may be formed into a spherical shape by melt molding.

Therefore, by melt-molding, the tip of the V-shaped portion can be easily formed into a spherical shape.

Preferably, according to the snare with a V-shaped portion of the present invention, the high-frequency generator generates a first input electrode, and the return electrode and the emitter electrode are introduced into the target body through the tube sheath and form a conductive loop in the target body; wherein, the emitter electrode Receive a first input voltage generated by a high frequency generator, thereby applying a first voltage between the emitter electrode and the return electrode, so that the liquid introduced into the target body reaches a first temperature and causes the liquid to be converted into a plasma layer, thereby utilizing electrical energy The liquid is excited to generate plasma, and the target body is vaporized and snare cut based on the radio frequency energy of the plasma.

Preferably, according to the snare with a V-shaped portion of the present invention, the high-frequency generator further generates a second input voltage; and the transmitting electrode receives the second input voltage generated by the high-frequency generator, so that the transmitting electrode and the return electrode are connected between the transmitting electrode and the return electrode. A second voltage is applied in between to maintain the target at the second temperature.

Preferably, according to the snare having a V-shaped portion of the present invention, the first voltage is in the range of 100 Vrms to 300 Vrms, and the second voltage is in the range of 60 Vrms to 80 Vrms.

Preferably, according to the snare having a V-shaped portion of the present invention, the first temperature is in the range of 35°C-40°C, and the second temperature is in the range of 40°C-70°C.

Preferably, according to the snare having a V-shaped portion of the present invention, the return electrode is wrapped around the sheath.

Preferably, according to the snare having a V-shaped portion of the present invention, the snare includes an injection chamber interface that inputs liquid based on a liquid input command from the controller.

Preferably, according to the snare with V-shaped portion of the present invention, the liquid is a conductive medium.

The above and other objects, features and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings.

Description of drawings

Exemplary embodiments of the present invention can be more fully understood by referring to the following drawings:

1 is a side view of a snare according to the present invention;

2A is an enlarged view of a snare cutter head of a snare according to the present invention;

FIG. 2B is an enlarged view of the state in which the snare tip in FIG. 2A is deformed;

FIG. 3 is a cross-sectional view taken along line I-I in FIG. 1 .

Detailed ways

The embodiments of the present invention are described below by specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of being thorough and complete. The present invention is disclosed and the scope of the present invention is fully conveyed to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the invention. In the drawings, the same elements/elements are given the same reference numerals.

Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal meanings.

Figure 1 is a side view of a snare according to the present invention. The snare in the utility model can be used for snare cutting, ablation, coagulation and hemostasis in the digestive tract such as polyps or protruding tumor sites. In addition, the snare can also be used for snare cutting, ablation, coagulation and hemostasis in joints, spine, skin, ENT, etc. The snare of the present application is used within 24 hours, classified as temporary contact according to contact time, classified as external access device (with tissue/bone/dentin) according to the nature of contact with the human body, and classified as active medical device according to the structural characteristics of medical devices instrument.

The snare uses a bipolar scheme and its operating frequency is 105kHz. Optionally, the operating frequency of the snare may be in the range of 100-110. In operation, the snare forms a thin layer upon activation between the emitter electrode and the return electrode (described below) through, for example, saline as a conductive medium. When sufficient energy (voltage) is given to the snare, the saline solution is transformed into a gas layer (plasma layer) composed of energized charged particles. That is, the snare uses energy to excite a conductive medium (eg, physiological saline) to generate plasma, and relies on the energy of the plasma to break tissue molecular bonds. The energy of the plasma directly splits biological macromolecules such as proteins into O ² , CO ² , N ² and other gases, thereby completing the vaporization trap cutting of the tissue. When a low voltage is applied to the working cutter head of the snare, the electric field is lower than the threshold value required to generate the plasma layer and the tissue resistance heat is generated, so that the tissue is ablated, coagulated and hemostasis is performed.

The operating part of the snare (low temperature plasma snare knife surgical equipment) includes handle 1, pull rod 2, socket Pin 3, slider 4, spacer 5, front rod 6 (also known as pull rod cap), tube sheath 7 and injection cavity interface 8 and so on. The pull rod 2 is grasped by the operator to facilitate the operation of the snare. The sheath 7 is an elongated tube extending longitudinally from the front rod 16, and the sheath 7 is to be inserted into the target body (the lesion of the human body).

The sheath 7 is used to provide the outer covering function. The injection chamber interface 8 inputs liquid (eg, a conductive medium) based on a liquid input command from a not-shown controller, wherein the current balance of the liquid is measured in real time and transmitted to the controller, which is based on The current margin determines whether to generate the liquid input command and after determining to generate the liquid input command, the liquid is controlled from the liquid inlet port formed in the injection lumen interface 8 via the liquid passage lumen 18 formed in the sheath 7 (see Figure 3) and finally to the input of the target body.

In addition, as shown in FIGS. 1 , 2A and 2B , the operating part of the snare also includes an emitter electrode 21 and a return electrode 22 provided at the tip of the sheath 7 . The emitter electrode 21 is telescopically arranged by the slider 4 . Further, the emitter electrode 21 forms a closed snare tip around the target body. In the present embodiment, the tip of the snare tip is formed as a V-shaped portion 21A that opens toward the inside of the snare tip. The tip of the V-shaped portion 21A is formed into a spherical shape by melt molding. The melt molding refers to a process in which the tip of the snare tip is melted by high temperature or the like and the tip of the melted snare tip is shaped using a mold having a spherical cavity corresponding to the shape of the spherical portion.

With the above configuration, when the vaporization snare is cut with the snare having the V-shaped portion, with the V-shaped portion 21A, the snare tip formed by the emitter electrode can easily abut against the tissue around the target body (for supporting the snare When the snare is inserted further inward, the snare tip is deformed into a shape corresponding to the target body by the V-shaped portion 21A. Therefore, the target body can be reliably sheathed by the deformed shape, and the vaporization trap cutting can be completed. As a result, the snare according to the present invention can reliably perform vaporization snare cutting on target bodies of different shapes. In addition, since the top of the V-shaped portion is formed into a spherical shape, the V-shaped portion will not penetrate into human tissue and cause unnecessary damage to the human body.

In the initial state, the transmitting electrode 21 is completely retracted into the sheath 7 to facilitate the entry of the front end of the sheath 7 into the human body. After reaching the designated position, the slider 4 is operated to move forward, whereby the emitter electrode 21 provided at the top of the sheath 7 is pushed out from the top of the sheath 7, thereby forming a closed snare cutter around the target body, To trap the target body, perform vaporization trap cutting.

The emitter electrode 21 and the return electrode 22 are introduced into the target body through the sheath 7 and form a conductive loop in the target body. The transmitting electrode 21 receives the first input voltage generated by the high-frequency generator via a socket Pin 3 connected to a high-frequency generator (not shown) through a high-frequency connecting line, so that between the transmitting electrode 21 and the return electrode 22 A first voltage is applied to make the conductive medium reach a first temperature and to cause the conductive medium to be converted into a plasma layer, so that the conductive medium is excited by electrical energy to generate plasma, and the target body is subjected to vaporization and snare cutting based on the radio frequency energy of the plasma . Further, the transmitting electrode 21 receives the second input voltage generated by the high frequency generator via the socket Pin 3 and transmits the second input voltage to the transmitting electrode 21 , and a second input voltage is applied between the transmitting electrode 21 and the return electrode 22 The voltage is applied to maintain the target body at the second temperature, thereby causing the target body to undergo ablation and coagulation.

For example, the range of the first temperature is 35°C-40°C, and the range of the second temperature is 40°C-70°C. The range of the first voltage is 100Vrms to 300Vrms, and the range of the second voltage is 60Vrms to 80Vrms.

The length of the return electrode 22 can be any reasonable value, such as 4 to 5 millimeters. The distance between the end of the return electrode 22 near the top of the sheath 7 and the top surface of the sheath 7 may be any reasonable value, for example, 2 to 3 mm. The water outlet 23 (or referred to as the infusion port) is provided at the top of the sheath 7 , and the liquid entering from the liquid inlet port in the injection cavity interface 8 enters the target body through the water outlet 23 .

For example, the material of the emitter electrode 21 is stainless steel 304, the material of the return electrode 22 is stainless steel 304, the material of the tube sheath 7 is PTFE, and the material of the injection cavity interface 8 is acrylonitrile-butadiene-styrene Copolymer ABS, the material of the front rod 6 is ABS, the material of the block 5 is ABS, the material of the slider 4 is ABS, the material of the socket Pin 3 is stainless steel 304 and the material of the handle 1 is ABS.

As shown in FIG. 3 , the emitter electrode lead 16 , the return electrode lead 17 , the liquid-passing cavity 18 and the emitter electrode cavity 19 are illustrated. In more detail, the enlarged view in FIG. 3 shows a cross-sectional view of the emitter electrode wire 16, which includes the insulating layer 16a and the wire 16b. The emitter electrode wire 16 needs an insulating layer for insulation and heat insulation, and the return electrode wire 17 may not be provided with an insulating layer. The emitter electrode lead 16 and the return electrode lead 17 are connected to the emitter electrode 21 and the return electrode 22, respectively. Further, the emitter electrode lead 16 and the return electrode lead 17 are connected to a high-frequency generator not shown.

Although a liquid-passing cavity is formed around the emitter electrode wire 16 as described above, those skilled in the art can also use the return electrode cavity 19 as a liquid-passing cavity as required. An insulating layer is required.

The present invention has been described with reference to a few embodiments. However, as is known to those skilled in the art, other embodiments than those disclosed above are equally within the scope of the present invention, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/the/the [means, component, etc.]" are open to interpretation as at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (8)

1. A snare with a V-shaped portion comprising a front rod, a tube sheath extending from the front rod and a transmitter electrode and a return electrode arranged on the top of the tube sheath, the transmitter electrode and the return electrode Electrically connected to a high-frequency generator via a wire, characterized in that: The emitter electrode forms a closed snare cutter head around the target body, the tip of the snare cutter head is formed as a V-shaped portion that opens toward the inside of the snare cutter head, and the top end of the V-shaped portion is formed by melting and molding. spherical. 2. The snare with a V-shaped portion of claim 1, wherein the high frequency generator generates a first input voltage; and The return electrode and the emitter electrode are introduced into the target body through the tube sheath and form a conductive loop in the target body; Wherein, the transmitting electrode receives the first input voltage generated by the high-frequency generator, so that a first voltage is applied between the transmitting electrode and the return electrode, so that the liquid introduced into the target body reaches the first voltage. a temperature and cause the liquid to be converted into a plasma layer, so that the liquid is excited by electrical energy to generate plasma, and the target body is vaporized and snare cut based on the radio frequency energy of the plasma. 3. The snare with a V-shaped portion of claim 2, wherein the high frequency generator further generates a second input voltage; and The transmitting electrode receives the second input voltage generated by the high frequency generator to apply a second voltage between the transmitting electrode and the return electrode to maintain the target at a second temperature . 4. The snare of claim 3, wherein the first voltage ranges from 100Vrms to 300Vrms and the second voltage ranges from 60Vrms to 80Vrms. 5. The snare with a V-shaped portion of claim 3, wherein the first temperature is in the range of 35°C to 40°C and the second temperature is in the range of 40°C to 70°C. 6. The snare of claim 3, wherein the return electrode is wrapped around the sheath. 7. The snare with a V-shaped portion of claim 1, wherein the snare includes an injection lumen interface that inputs fluid based on fluid input commands from the controller. 8. The snare with a V-shaped portion of claim 7, wherein the liquid is a conductive medium.