CN215018125U - Snare and incision knife - Google Patents

Abstract

The utility model relates to the field of medical equipment, particularly, relate to a snare and incision sword. A snare comprises a tube body, a first operating part, a second operating part and a loop; the first operating part and the second operating part are movably connected to the tube body; the first head part and the second head part at the near end of the ferrule are accommodated in the tube body, and the first head part and the second head part are respectively connected with the first operating part and the second operating part; the first operation part and the second operation part are used for moving relative to the tube body under the action of external force so as to change the shape of the ferrule positioned outside the tube body; the snare can avoid the slippage caused by the simultaneous pull-back of two sides, thereby avoiding the situation that the surgery cycle is prolonged caused by the slippage. The cutter head of the incision knife is connected with the far end of the ferrule through the connecting piece, and the ferrule and the cutter head can be driven to move through the first operation part and the second operation part, so that the condition that the operation period is prolonged due to slippage can be avoided.

Description

Snare and incision knife

Technical Field

The utility model relates to the field of medical equipment, particularly, relate to a snare and incision sword.

Background

Endoscope technology has been developed for over 50 years, and has gone through the stages from disease diagnosis to disease treatment, and the treatment of some digestive diseases is very effective and reliable and even becomes the first-choice therapy for some diseases. With the development of endoscopic techniques in recent years, endoscopic tissue biopsy, EMR (endoscopic mucosal resection), and ESD (endoscopic mucosal dissection) have been widely used, and are becoming the first choice for treatment of gastrointestinal hemorrhage, polypectomy, and early cancer. Among them, ESD plays a key role in the discovery, diagnosis and ablation of early cancers.

In each clinical department, direct observation and treatment of various pathological conditions in a body cavity are performed for the purpose of diagnosis, determination of a treatment result, determination of a treatment course, and the like. These procedures have conventionally been performed by a highly invasive surgical procedure such as an open abdomen or chest. However, with the recent spread of endoscopic surgical instruments, endoscopes such as laparoscopes and thoracoscopes, which have a smaller incision wound, have become available.

Endoscopic Submucosal Dissection (ESD) refers to an endoscopic minimally invasive technique that utilizes high frequency instruments to perform submucosal dissection on lesions larger than 2 cm. Because the area of an ESD excision mucosa is large, the operation process is complicated and generally consumes a long time, and the operation is required to be performed under the guidance of an endoscope. The endoscope firstly enters a human body to find diseased tissues, then the high-frequency incision knife enters the human body through an endoscope clamping channel to mark the diseased tissues, the instrument is withdrawn after marking, the injection needle is used for submucosal injection, the proper high-frequency incision knife is used for cutting and stripping after injection, if bleeding occurs in the operation, the hemostatic forceps are required to be replaced for electric coagulation hemostasis, and about 1-2 hours can be used for successfully excising about 3cm of early cancer diseased tissues.

In the process of stripping off the lesion from the ferrule, the lesion is easy to slip off, thereby prolonging the operation period.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a snare and incision sword, it can avoid because of the slippage that both sides pull back simultaneously and appear to can avoid appearing leading to the condition of operation cycle extension because of the slippage.

The embodiment of the utility model is realized like this:

in a first aspect, the utility model provides a snare, which comprises a tube body, a first operating part, a second operating part and a loop;

the first operating part and the second operating part are movably connected to the tube body; the first head part and the second head part at the near end of the ferrule are accommodated in the tube body, and the first head part and the second head part are respectively connected with the first operating part and the second operating part;

the first operating part is used for moving relative to the tube body under the action of external force and driving the first head part to move relative to the tube body so as to change the shape of the ferrule positioned outside the tube body; the second operation part is used for moving relative to the tube body under the action of external force and driving the second head part to move relative to the tube body so as to change the shape of the ferrule positioned outside the tube body.

In an alternative embodiment, the first operating portion and the second operating portion are both slidably connected to the pipe body in an axial direction of the pipe body.

In an alternative embodiment, the tube comprises a first tube, a core rod, a first traction member and a second traction member;

the near end of the first tube body is connected with the far end of the core rod; the first operating part and the second operating part are both connected with the core bar in a sliding way;

the first traction piece and the second traction piece are contained in the first pipe body and the core rod, the far end of the first traction piece and the far end of the second traction piece are respectively connected with the first head part and the second head part, and the near end of the first traction piece and the near end of the second traction piece are respectively connected with the first operation part and the second operation part.

In an alternative embodiment, the snare further comprises a stopper housed within the first tube and located at a distal end of the first tube;

the limiting piece is provided with a first channel and a second channel which are communicated along the axial direction of the first pipe body, and the first channel and the second channel are both communicated with the inner cavity of the first pipe body;

the first head part and the far end of the first traction piece are accommodated in the first channel, and the second head part and the far end of the second traction piece are accommodated in the second channel.

In an alternative embodiment, the snare further comprises a first connection tube and a second connection tube, the first connection tube and the second connection tube are respectively accommodated in the first channel and the second channel and respectively matched with the first channel and the second channel;

the far end of the first connecting pipe and the far end of the second connecting pipe are respectively connected with the first head part and the second head part, and the near end of the first connecting pipe and the near end of the second connecting pipe are respectively connected with the far end of the first traction piece and the far end of the second traction piece.

In an optional embodiment, the snare further comprises a second tube body, and the second tube body is sleeved on the first tube body;

the first pipe body is used for rotating around the axis direction of the first pipe body or moving along the axis direction of the first pipe body relative to the second pipe body under the action of external force.

In an alternative embodiment, the snare further comprises a wrap guard housed within the first tube and positioned between the first traction member and the second traction member to isolate the first traction member from the second traction member.

In an alternative embodiment, the snare further comprises a wrap guard, the wrap guard being sleeved over the first traction member or the second traction member.

In a second aspect, the present invention provides a cutting knife, comprising an electrode portion and the snare;

the snare further comprises a conductive plug electrically connected with the loop;

the electrode part comprises a cutter head and a connecting piece, the cutter head is connected with the connecting piece, the far end of the ferrule is connected with the connecting piece, and the cutter head is electrically connected with the ferrule.

In an alternative embodiment, the electrically conductive plug is connected to the first operating part or the second operating part.

In an alternative embodiment, the snare further comprises a first tube, a core rod, and a stopper; the near end of the first tube body is connected with the far end of the core rod; the first operating part and the second operating part are both connected with the core bar in a sliding way;

the limiting piece is accommodated in the first pipe body and is positioned at the far end of the first pipe body; the limiting piece is used for being abutted to the connecting piece so as to limit the movement of the connecting piece along the axial direction of the first pipe body.

In an alternative embodiment, the snare further comprises a second tube;

the second pipe body is sleeved on the first pipe body, and the first pipe body is used for moving along the axis direction of the first pipe body relative to the second pipe body under the action of external force, so that the cutter head is contained in the second pipe body or positioned outside the second pipe body.

In an alternative embodiment, the incision knife further comprises a tee, a seal, a first pulling member, and a second pulling member;

the first traction piece and the second traction piece are accommodated in the first pipe body and the core rod, the far end of the first traction piece and the far end of the second traction piece are respectively connected with the first head part and the second head part, and the near end of the first traction piece and the near end of the second traction piece are respectively connected with the first operation part and the second operation part;

the tee joint piece is positioned at the joint of the first pipe body and the core rod; the three-way piece is provided with a through hole and a liquid injection port communicated with the through hole, the through hole extends along the axis direction of the first pipe body and is used for the first traction piece and the second traction piece to pass through; the far end of the first tube body is communicated with the through hole; the sealing element is positioned at the joint of the three-way element and the core rod, is sleeved on the first traction element and the second traction element and is used for blocking the through hole from the inner cavity of the core rod;

the liquid injection channel is arranged on the cutter head, and when the connecting piece is abutted to the limiting piece, the liquid injection channel is communicated with the through hole.

The utility model discloses beneficial effect includes:

the snare comprises a tube body, a first operation part, a second operation part and a loop. Wherein, the first operating part and the second operating part are movably connected with the tube body; the first head part and the second head part at the near end of the ferrule are both accommodated in the tube body, and the first head part and the second head part are respectively connected with the first operating part and the second operating part. The first operating part is used for moving relative to the tube body under the action of external force and driving the first head part to move relative to the tube body so as to change the shape of the ferrule positioned outside the tube body; the second operation part is used for moving relative to the tube body under the action of external force and driving the second head part to move relative to the tube body so as to change the shape of the ferrule positioned outside the tube body.

From this, this snare can change the shape of the lasso that is located the outside of the pipe body through the motion of first operation portion or second operation portion, thereby can enlarge the application scope of this snare, and can carry out the exclusive operation to the both sides of lasso through the motion of first operation portion and second operation portion, thereby can realize the unilateral operation of snare, and then can realize the unilateral pull-back function of snare, and then can avoid the slippage because of both sides pull-back appears simultaneously, thereby can avoid appearing leading to the circumstances of operation cycle extension because of the slippage.

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 view of a snare according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the ferrule and the tube body according to the embodiment of the present invention;

fig. 3 is a schematic structural view of a tube body according to an embodiment of the present invention;

fig. 4 is a schematic structural view of the tube body, the first operating portion and the second operating portion in the embodiment of the present invention;

FIG. 5 is a schematic structural view of a cutting blade according to an embodiment of the present invention;

fig. 6 is a schematic structural view of an electrode portion in an embodiment of the present invention;

FIG. 7 is a diagram illustrating a state in which the ferrule is positioned outside the first tube according to an embodiment of the present invention;

FIG. 8 is a view showing the state of the ferrule when both sides of the ferrule are contracted according to the embodiment of the present invention;

FIG. 9 is a view showing the state of the ferrule during one-sided shrinkage according to the embodiment of the present invention;

fig. 10 is a state diagram of the embodiment of the present invention in which the electrode portion is located inside the second tube;

fig. 11 is a state diagram of the embodiment of the present invention in which the electrode portion is located outside the second tube;

fig. 12 is a schematic structural view of a tee and a sealing member according to an embodiment of the present invention.

Icon 100-snare; 110-a tube body; 120-a first operating part; 130-a second operating part; 140-a ferrule; 141-a first head; 142-a second head; 111-a first tube; 112-core rod; 113-a first traction member; 114-a second traction member; 150-a stop; 151-first channel; 152-a second channel; 160-a first connection tube; 170-a second connecting tube; 115-a second tube; 180-a lap guard; 200-cutting; 210-an electrode section; 220-a conductive plug; 211-a tool bit; 212-a connector; 230-a tee; 240-a seal; 231-a through hole; 232-liquid injection port; 213-liquid injection channel.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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, as 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 accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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: 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 the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-4, fig. 1 shows the structure of a snare in an embodiment of the present invention, fig. 2 shows the structure of a snare and a tube body in an embodiment of the present invention, fig. 3 shows the structure of a tube body in an embodiment of the present invention, and fig. 4 shows the structures of a first operation portion and a second operation portion in an embodiment of the present invention;

the snare 100 includes a tube 110, a first operation portion 120, a second operation portion 130, and a loop 140.

The first operating portion 120 and the second operating portion 130 are movably connected to the tube 110; the first head 141 and the second head 142 at the proximal end of the ferrule 140 are accommodated in the tube 110, and the first head 141 and the second head 142 are respectively connected to the first operating part 120 and the second operating part 130;

the first operating part 120 is used for moving relative to the tube 110 under the action of external force and driving the first head part 141 to move relative to the tube 110 so as to change the shape of the ferrule 140 located outside the tube 110; the second operating portion 130 is used for moving relative to the tube 110 under the action of external force, and driving the second head 142 to move relative to the tube 110, so as to change the shape of the ferrule 140 located outside the tube 110.

It should be noted that, in the present embodiment, the terms "distal end", "proximal end", etc. need to be described in the whole text, and the description is only for better understanding of the present invention, and the present invention is not to be construed as limited thereto. Generally, during use of the snare 100, a front end portion of the snare 100 (referred to as the left end of the tube 110 in the relative position of fig. 1) extends into the body, while a rear end portion of the tube 110 (referred to as the right end of the tube 110 in the relative position of fig. 1) is accessible to a health care provider. Thus, "distal" may be understood as a part or component that is relatively close to the anterior portion of the body, and "proximal" may be understood as a part or component that is relatively close to the posterior portion of the body. Of course, when it is not explicitly indicated which part or member is "proximal" or "distal", the default designation is the proximal or distal end of the entire snare 100.

The two free ends of the ferrule 140 extending into the tube 110 are a first head 141 and a second head 142, and the movement of the first head 141 and the second head 142 relative to the tube 110 can drive the ferrule 140 to move relative to the tube 110, specifically, when the first head 141 and the second head 142 move towards the proximal end of the tube 110, the ferrule 140 contracts relative to the tube 110, and similarly, when the first head 141 and the second head 142 move towards the distal end of the tube 110, the ferrule 140 extends relative to the tube 110.

In the present embodiment, the first operating portion 120 and the second operating portion 130 are both slidably connected to the tube 110 along the axial direction of the tube 110; the first operating part 120 is used for sliding relative to the tube 110 under the action of external force and driving the first head part 141 to move relative to the tube 110 so as to change the shape of the ferrule 140 located outside the tube 110; the second operating portion 130 is used for sliding relative to the tube 110 under the action of an external force and driving the second head 142 to move relative to the tube 110, so as to change the shape of the ferrule 140 located outside the tube 110.

Referring to fig. 1-4, the working principle of the snare 100 is:

the snare 100 includes a tube 110, a first operation portion 120, a second operation portion 130, and a snare 140. The first operating part 120 and the second operating part 130 are both slidably connected to the tube 110 along the axial direction of the tube 110; the first head 141 and the second head 142 at the proximal end of the ferrule 140 are accommodated in the tube 110, and the first head 141 and the second head 142 are respectively connected to the first operating portion 120 and the second operating portion 130. The first operating portion 120 is used for sliding relative to the tube 110 under the action of an external force and driving the first head portion 141 to move relative to the tube 110, so as to change the shape of the ferrule 140 located outside the tube 110; the second operating portion 130 is used for sliding relative to the tube 110 under the action of an external force and driving the second head 142 to move relative to the tube 110, so as to change the shape of the ferrule 140 located outside the tube 110.

Therefore, the shape of the loop 140 outside the tube body 110 can be changed by the movement of the first operation part 120 or the second operation part 130 of the snare 100, so that the application range of the snare 100 can be expanded, and both sides of the loop 140 can be independently operated by the movement of the first operation part 120 and the second operation part 130, so that one-side operation of the snare 100 can be realized, and then one-side pull-back function of the snare 100 can be realized, and further slipping caused by simultaneous pull-back of both sides can be avoided, so that the situation that the operation cycle is prolonged due to slipping can be avoided.

Further, referring to fig. 1-4, in the present embodiment, when the tube 110 is disposed, the tube 110 includes a first tube 111, a core rod 112, a first pulling member 113 and a second pulling member 114; wherein, the proximal end of the first tube 111 is connected with the distal end of the core rod 112; the first operating portion 120 and the second operating portion 130 are slidably connected to the core rod 112; the first traction element 113 and the second traction element 114 are accommodated in the first tube 111 and the core rod 112, the distal end of the first traction element 113 and the distal end of the second traction element 114 are respectively connected with the first head 141 and the second head 142, and the proximal end of the first traction element 113 and the proximal end of the second traction element 114 are respectively connected with the first operation part 120 and the second operation part 130.

Therefore, when the first operating portion 120 moves relative to the core rod 112, the first head 141 can be driven to move by the first traction member 113; when the second operation portion 130 moves relative to the core rod 112, the second head 142 can be driven to move by the second traction element 114; that is, the first traction member 113 and the second traction member 114 located in the tube 110 can perform a transmission function during operation.

Further, referring to fig. 2-4, in the present embodiment, the snare 100 further includes a limiting member 150, the limiting member 150 is accommodated in the first tube 111 and is located at the distal end of the first tube 111; along the axial direction of the first tube 111, the limiting member 150 is provided with a first channel 151 and a second channel 152 which are through, and both the first channel 151 and the second channel 152 are communicated with the inner cavity of the first tube 111; the distal ends of the first head 141 and the first traction element 113 are received in the first channel 151, and the distal ends of the second head 142 and the second traction element 114 are received in the second channel 152. In addition, the snare 100 further includes a first connection tube 160 and a second connection tube 170, the first connection tube 160 and the second connection tube 170 are respectively accommodated in the first channel 151 and the second channel 152, and are respectively in clearance fit with the first channel 151 and the second channel 152; the distal end of the first connection tube 160 and the distal end of the second connection tube 170 are connected to the first head 141 and the second head 142, respectively, and the proximal end of the first connection tube 160 and the proximal end of the second connection tube 170 are connected to the distal end of the first traction element 113 and the distal end of the second traction element 114, respectively. Thus, the first connection pipe 160 and the second connection pipe 170 are disposed in the first channel 151 and the second channel 152 of the limiting member 150, and the first connection pipe 160 and the second connection pipe 170 are respectively in clearance fit with the first channel 151 and the second channel 152, so that the first connection pipe 160 and the second connection pipe 170 can slide relative to the first channel 151 and the second channel 152.

Therefore, when the first operating part 120 moves relative to the core rod 112, since the proximal end of the first pulling member 113 is connected to the first operating part 120, the distal end of the first pulling member 113 is located in the first channel 151 and connected to the proximal end of the first connecting tube 160, and the distal end of the first connecting tube 160 is connected to the first head 141, the movement of the first operating part 120 is transmitted to the first head 141 through the first pulling member 113 and the first connecting tube 160, and since a certain friction force is provided between the first connecting tube 160 and the first channel 151, it is necessary to apply a certain external force to the first operating part 120 to drive the first head 141 to move.

Further, referring to fig. 1-4, in the present embodiment, the snare 100 further includes a second tube 115, and the second tube 115 is sleeved on the first tube 111; therefore, by applying an external force to the first tube 111 or the second tube 115, a relative motion between the first tube 111 and the second tube 115 can be generated, and specifically, the first tube 111 is configured to rotate around its axis or move along its axis relative to the second tube 115 under the action of the external force. That is, the angle of the ferrule 140 can be adjusted by rotating the first tube 111 relative to the second tube 115 in the axial direction thereof, and the length of the ferrule 140 extending out of the second tube 115 can be adjusted by moving the first tube 111 relative to the second tube 115 in the axial direction thereof, so as to increase the usable range of the snare 100, and the second tube 115 can also protect the first tube 111 and the ferrule 140 when the ferrule 140 is retracted into the first tube 111, and the ferrule 140 is accommodated in the second tube 115 when the snare 100 is shuttled in the endoscopic tract, thereby protecting the endoscopic tract from being damaged.

Referring to fig. 3 and 4, in the present embodiment, in order to prevent the first pulling member 113 and the second pulling member 114 in the first tube 111 from being entangled during the operation of the snare 100, the snare 100 further includes a winding-prevention member 180, wherein the winding-prevention member 180 is accommodated in the first tube 111 and located between the first pulling member 113 and the second pulling member 114 to isolate the first pulling member 113 and the second pulling member 114, thereby preventing the entanglement. In other embodiments of the present invention, the anti-winding member 180 can be further sleeved on the first pulling member 113 or the second pulling member 114, so as to isolate the first pulling member 113 and the second pulling member 114, thereby avoiding the winding.

In Endoscopic Submucosal Dissection (ESD), the operation process is complicated and generally takes a long time due to the large area of the mucosa to be excised by ESD, and the operation needs to be performed under the guidance of an endoscope. And can be divided into the following steps: an endoscope firstly enters a human body to find diseased tissues, then a high-frequency incision knife 200 enters the human body through an endoscope channel to mark the diseased tissues, the instrument is withdrawn after marking, an injection needle is used for submucosal injection, a proper high-frequency incision knife 200 is used for cutting and stripping after injection, if bleeding occurs in the operation, a hemostatic forceps needs to be replaced for electric coagulation hemostasis, and about 1-2 hours can be used for successfully excising a 3 cm-old early cancer lesion.

When carrying out scope submucosal stripping operation (ESD) promptly, need frequently change the apparatus in the art, not only loaded down with trivial details but also consuming time, be unfavorable for patient's operation, the normal saline of injecting in the operation process can run off along with the operation time moreover, need inject this process of normal saline again and can waste a large amount of time, can increase because normal saline loses in the operation can not obtain in time replenishing and increased the fenestrate risk in the operation and the time of extension operation, bring the misery for the patient.

Therefore, in order to solve the above problems, please refer to fig. 5 and fig. 6, and with reference to fig. 1 to fig. 4, fig. 5 shows the structure of the cutting knife in the embodiment of the present invention, fig. 6 shows the structure of the electrode portion in the embodiment of the present invention, based on the snare 100, the present invention provides a cutting knife 200, the cutting knife 200 includes the electrode portion 210 and the snare 100;

specifically, snare 100 further includes a conductive plug 220 electrically connected to ferrule 140;

the electrode portion 210 includes a cutter head 211 and a connector 212, the cutter head 211 is connected to the connector 212, the distal end of the ferrule 140 is connected to the connector 212, and the cutter head 211 is electrically connected to the ferrule 140.

In the present embodiment, the conductive plug 220 is connected to the first operating part 120 or the second operating part 130.

Referring to fig. 1 to 9, fig. 7 shows a structure of a ferrule located outside a first tube body in an embodiment of the present invention, fig. 8 shows a structure of a ferrule when both sides of the ferrule contract in an embodiment of the present invention, and fig. 9 shows a structure of a ferrule when one side contracts in an embodiment of the present invention;

the cutter head 211 of the cutting knife 200 is connected to the distal end of the ferrule 140 through a connection member 212, and the first operating part 120 or the second operating part 130 is provided with a conductive plug 220 electrically connected to the ferrule 140, and the ferrule 140 is electrically connected to the cutter head 211, thereby enabling the cutter head 211 to be electrically conducted; in addition, when the ferrule 140 is adjusted by the first operating portion 120 and the second operating portion 130, so that the ferrule 140 moves relative to the tube body 110, the shape of the ferrule 140 located outside the tube body 110 can be changed and the cutter 211 of the ferrule 140 can be driven to move by the movement of the first operating portion 120 or the second operating portion 130, in this process, the one-sided operation and the two-sided operation of the snare 100 can be realized by the movement of the first operating portion 120 and the second operating portion 130, and then the one-sided pull-back function of the snare 100 can be realized, and further the slippage caused by the simultaneous pull-back of both sides can be avoided, so that the situation that the operation cycle is prolonged due to the slippage can be avoided.

It should be noted that, in the embodiment, as can be seen from the above, the first pulling member 113, the second pulling member 114, the first connecting tube 160, the second connecting tube 170 and the limiting member 150 are disposed in the tube body 110, so that the ferrule 140 is electrically connected to the conductive coil, and thus the first pulling member 113, the second pulling member 114, the first connecting tube 160, the second connecting tube 170 and the limiting member 150 can all conduct electricity.

Further, referring to fig. 5-11 in conjunction with fig. 1-4, fig. 10 shows a structure of the electrode portion located inside the second tube in the embodiment of the present invention, and fig. 11 shows a structure of the electrode portion located outside the second tube in the embodiment of the present invention;

in this embodiment, the snare 100 further includes a first tube 111, a core rod 112, and a stopper 150; the proximal end of the first tube 111 is connected to the distal end of the core rod 112; the first operating portion 120 and the second operating portion 130 are slidably connected to the core rod 112; the limiting member 150 is accommodated in the first tube 111 and located at the distal end of the first tube 111; the stopper 150 is configured to abut against the connecting member 212 to restrict movement of the connecting member 212 in the axial direction of the first pipe body 111. Therefore, when the tool bit 211 is moved in a direction approaching the first pipe body 111 by the driving action of the first and second operating portions 120 and 130, the positions of the tool bit 211 and the first connecting member 212 with respect to the first pipe body 111 can be restricted by the abutment of the stopper 150 with the connecting member 212, and the connecting member 212 and the tool bit 211 can be supported by the abutment of the stopper 150 with the connecting member 212, thereby facilitating the operation of the tool bit 211.

The second tube body 115 is sleeved on the first tube body 111, and the first tube body 111 is used for moving along the axis direction of the first tube body 115 relative to the second tube body 115 under the action of external force, so that the cutter head 211 is accommodated in the second tube body 115 or located outside the second tube body 115. Therefore, the second tube 115 can protect the cutting head 211 contained in the second tube 115, and when the incision knife 200 is shuttled back and forth in the endoscopic artery, the cutting head 211 is contained in the second tube 115, so that the endoscopic artery can be protected from being damaged.

Further, referring to fig. 5-12 in conjunction with fig. 1-4, fig. 12 shows the structure of the tee member and the sealing member in the embodiment of the present invention, in this embodiment, in order to inject liquid through the incision knife 200, the incision knife 200 further includes a tee member 230, a sealing member 240, a first traction member 113 and a second traction member 114; the first traction piece 113 and the second traction piece 114 are accommodated in the first tube 111 and the core rod 112, the distal end of the first traction piece 113 and the distal end of the second traction piece 114 are respectively connected with the first head 141 and the second head 142, and the proximal end of the first traction piece 113 and the proximal end of the second traction piece 114 are respectively connected with the first operation part 120 and the second operation part 130;

the tee 230 is located at the connection of the first tube 111 and the core rod 112; the three-way member 230 is provided with a through hole 231 and a liquid injection port 232 communicated with the through hole 231, wherein the through hole 231 extends along the axial direction of the first tube 111 and is used for the first traction member 113 and the second traction member 114 to pass through; the distal end of the first tube 111 communicates with the through hole 231; the sealing element 240 is located at the connection position of the tee 230 and the core rod 112, and the sealing element 240 is sleeved on the first traction element 113 and the second traction element 114 and is used for blocking the through hole 231 from the inner cavity of the core rod 112; the cutter head 211 is provided with a liquid injection channel 213, and when the connecting member 212 abuts against the limiting member 150, the liquid injection channel 213 is conducted with the through hole 231.

Thus, when the three-way member 230 is provided, since the three-way member 230 is provided with the liquid injection port 232 communicating with the through hole 231 and the sealing member 240 blocks the through hole 231 from the inner cavity of the stem 112, the liquid injected from the liquid injection port 232 flows into the inner cavity of the first tube 111 after entering the through hole 231, flows toward the distal end of the first tube 111 through the gap between the first pulling member 113 and the first tube 111, the gap between the second pulling member 114 and the first tube 111, and the gap between the first tube 111 and the stopper 150, and flows into the liquid injection passage 213 when the connecting member 212 abuts against the stopper 150, thereby injecting the liquid.

In order to allow the injection channel 213 to communicate with the first tube 111, a gap is provided between the distal end of the ferrule 140 and the connection part 212, and thus the liquid in the first tube 111 can flow into the injection channel 213 through the gap between the ferrule 140 and the connection part 212.

In summary, referring to fig. 1 to 12, in the use process of the incision knife 200, the movement of the first operating part 120 and the second operating part 130 can drive the ferrule 140 and the knife head 211 to move, and the relative movement between the first tube 111 and the second tube 115 can adjust the positions of the knife head 211 and the ferrule 140, so as to satisfy different use requirements, thereby improving the application range of the incision knife 200.

Specifically, when the incision knife 200 is used for Endoscopic Submucosal Dissection (ESD), the usage steps are as follows:

first, referring to fig. 10, the ferrule 140 is retracted, and the cutter head 211 is retracted into the second tube 115, at this time, the connecting member 212 and the position-limiting member 150 are kept in a state of abutting;

referring to fig. 11, the incision knife 200 is delivered to a lesion position through an endoscopic forceps channel, the first tube 111 is moved relative to the second tube 115 by operating the first tube 111 and the second tube 115, so that the knife head 211 extends out of the second tube 115, and then a lesion site is marked;

under the state that the cutter head 211 is powered on after being folded, liquid is injected through the liquid injection port 232, and the liquid enters the liquid injection channel 213 through the inner cavity of the first tube body 111 and then is injected and raised to the focus;

then, under the state that the knife head 211 is powered on after being folded, the edge of the focus part is cut through operating the knife head 211;

finally, referring to fig. 7-9, after the incision, the first operation part 120 and the second operation part 130 are operated simultaneously or step by step to push out the loop 140, so as to sleeve the loop 140 on the lesion site, and during the process of sleeve the lesion site, the first operation part 120 and the second operation part 130 can be operated simultaneously or step by step to recover the loop 140 according to the specific environment, thereby realizing the rapid mucosa stripping.

From this, this incision sword 200's simple structure is reasonable, collect the cutter, annotate the liquid, snare function is in an organic whole, the mark before having realized the operation and in the operation, cut, peel off and annotate the liquid, can constantly fill the moisture that runs off in the operation process, avoid causing the condition of tissue overcutting and fenestrate because of the moisture loss, can realize the function that focus position mucous membrane was peeled off fast simultaneously through lasso 140, and the both sides of lasso 140 can drive respectively, thereby can realize the function that the unilateral was drawn back, avoid both sides shrink simultaneously and lead to the condition appearance of slippage, and then shortened the time that the apparatus was changed in the art, when saving doctor's operation energy and time, can make the operation more high-efficient safer.

The above description is only an example of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A snare characterized by:

the snare (100) comprises a tube body (110), a first operating part (120), a second operating part (130) and a loop (140);

the first operating part (120) and the second operating part (130) are movably connected to the tube body (110); the first head part (141) and the second head part (142) at the proximal end of the ferrule (140) are accommodated in the tube body (110), and the first head part (141) and the second head part (142) are respectively connected with the first operating part (120) and the second operating part (130);

the first operating part (120) is used for moving relative to the tube body (110) under the action of external force and driving the first head part (141) to move relative to the tube body (110) so as to change the shape of a ferrule (140) positioned outside the tube body (110); the second operating part (130) is used for moving relative to the tube body (110) under the action of external force and driving the second head part (142) to move relative to the tube body (110) so as to change the shape of a ferrule (140) positioned outside the tube body (110).

2. A snare according to claim 1, wherein:

the first operation portion (120) and the second operation portion (130) are both slidably connected to the pipe body (110) in an axial direction of the pipe body (110).

3. A snare according to claim 1, wherein:

the pipe body (110) comprises a first pipe body (111), a core rod (112), a first traction piece (113) and a second traction piece (114);

the proximal end of the first tube (111) is connected with the distal end of the core rod (112); the first operating part (120) and the second operating part (130) are both slidably connected to the core bar (112);

the first traction piece (113) and the second traction piece (114) are contained in the first tube body (111) and the core rod (112), the far end of the first traction piece (113) and the far end of the second traction piece (114) are respectively connected with the first head part (141) and the second head part (142), and the near end of the first traction piece (113) and the near end of the second traction piece (114) are respectively connected with the first operation part (120) and the second operation part (130).

4. A snare according to claim 3, wherein:

the snare (100) further comprises a stopper (150), wherein the stopper (150) is accommodated in the first tube body (111) and is positioned at the far end of the first tube body (111);

along the axial direction of the first pipe body (111), the limiting piece (150) is provided with a first channel (151) and a second channel (152) which are communicated, and the first channel (151) and the second channel (152) are both communicated with an inner cavity of the first pipe body (111);

the distal ends of the first head (141) and the first traction element (113) are housed in the first channel (151), and the distal ends of the second head (142) and the second traction element (114) are housed in the second channel (152).

5. A snare according to claim 4, wherein:

the snare (100) further comprises a first connection tube (160) and a second connection tube (170), the first connection tube (160) and the second connection tube (170) are respectively accommodated in the first channel (151) and the second channel (152), and are respectively in clearance fit with the first channel (151) and the second channel (152);

the distal end of the first connecting tube (160) and the distal end of the second connecting tube (170) are connected to the first head (141) and the second head (142), respectively, and the proximal end of the first connecting tube (160) and the proximal end of the second connecting tube (170) are connected to the distal end of the first traction member (113) and the distal end of the second traction member (114), respectively.

6. A snare according to any one of claims 3 to 5, wherein:

the snare (100) further comprises a second tube body (115), and the second tube body (115) is sleeved on the first tube body (111);

the first pipe body (111) is used for rotating around the axis direction of the second pipe body (115) or moving along the axis direction of the second pipe body under the action of external force.

7. A snare according to any one of claims 3 to 5, wherein:

the snare (100) further comprises a winding prevention member (180), wherein the winding prevention member (180) is accommodated in the first tube body (111) and is positioned between the first traction member (113) and the second traction member (114) to isolate the first traction member (113) and the second traction member (114).

8. A snare according to any one of claims 3 to 5, wherein:

the snare (100) further comprises a wrap-around prevention member (180), the wrap-around prevention member (180) being sleeved on the first traction member (113) or the second traction member (114).

9. A kind of incision knife, its characteristic is:

the incision knife (200) comprising an electrode portion (210) and a snare (100) according to any one of claims 1-8;

the snare (100) further comprises an electrically conductive plug (220) in electrical connection with the snare (140);

the electrode part (210) comprises a cutter head (211) and a connecting piece (212), the cutter head (211) is connected with the connecting piece (212), the far end of the ferrule (140) is connected with the connecting piece (212), and the cutter head (211) is electrically connected with the ferrule (140).

10. The cutting knife of claim 9, wherein:

the conductive plug (220) is connected to the first operation part (120) or the second operation part (130).

11. The cutting knife of claim 9, wherein:

the snare (100) further comprises a first tube body (111), a core rod (112) and a limiting piece (150); the proximal end of the first tube (111) is connected with the distal end of the core rod (112); the first operating part (120) and the second operating part (130) are both slidably connected to the core bar (112);

the limiting piece (150) is accommodated in the first pipe body (111) and is positioned at the far end of the first pipe body (111); the limiting member (150) is used for abutting against the connecting member (212) so as to limit the movement of the connecting member (212) along the axial direction of the first pipe body (111).

12. The cutting knife of claim 11, wherein:

the snare (100) further comprises a second tube (115);

the second pipe body (115) is sleeved on the first pipe body (111), and the first pipe body (111) is used for moving along the axis direction of the second pipe body (115) under the action of external force, so that the cutter head (211) is accommodated in the second pipe body (115) or positioned outside the second pipe body (115).

13. The cutting knife of claim 12, wherein:

the incision knife (200) further comprises a tee joint piece (230), a sealing piece (240), a first traction piece (113) and a second traction piece (114);

the first traction piece (113) and the second traction piece (114) are accommodated in the first pipe body (111) and the core rod (112), the distal end of the first traction piece (113) and the distal end of the second traction piece (114) are respectively connected with the first head part (141) and the second head part (142), and the proximal end of the first traction piece (113) and the proximal end of the second traction piece (114) are respectively connected with the first operation part (120) and the second operation part (130);

the tee piece (230) is positioned at the joint of the first pipe body (111) and the core rod (112); the three-way piece (230) is provided with a through hole (231) and a liquid injection port (232) communicated with the through hole (231), and the through hole (231) extends along the axial direction of the first pipe body (111) and is used for allowing the first traction piece (113) and the second traction piece (114) to pass through; the far end of the first tube body (111) is communicated with the through hole (231); the sealing element (240) is positioned at the connection position of the tee piece (230) and the core rod (112), and the sealing element (240) is sleeved on the first traction piece (113) and the second traction piece (114) and is used for blocking the through hole (231) and the inner cavity of the core rod (112);

liquid injection channel (213) is formed in the cutter head (211), and when the connecting piece (212) is abutted to the limiting piece (150), the liquid injection channel (213) is communicated with the through hole (231).

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