Patent Description:
Document <CIT> discloses a treatment apparatus of the generic type defined above. Specifically, this document discloses a bipolar sphincterotome including an elongate tubular member, a cutting wire, and a return path. The return path includes a conductive ink portion disposed on an outer surface at a distal portion of the tubular member. The return path also includes a return wire disposed within the tubular member that is electrically coupled to the conductive ink portion. The return wire is disposed within a lumen configured to have two or more functions, one of which being to house the return wire. Additionally, the conductive ink portion is circumferentially disposed on the outer surface to provide visual access to a wire guide lumen.

Document <CIT> discloses an endoscopic tissue ablation system including a plurality of electrode pairs and a viewing window between each pair of adjacent electrodes. The electrodes can be energized in a predetermined sequence to ablate tissue around the circumference of a body lumen.

There are so far known bipolar treatment instruments for an endoscope that are passed through endoscopes to treat living tissue and the like. Some of the bipolar treatment instruments for an endoscope have, for example, a function of supplying a high-frequency current to a treatment instrument to perform treatments such as incision, cauterization, and hemostasis on living tissue.

As an example of such a treatment instrument for an endoscope, a high-frequency incision instrument that uses a polypectomy snare supplied with a high-frequency current to incise living tissue is recorded in document <CIT>. An electric wire, a passive electrode arranged on a periphery of an extending part, living tissue in contact with the passive electrode, the polypectomy snare, and an operating wire are connected to a feeding electrode to form a current loop to excise a polyp. In addition, a bipolar sphincterotome is recorded in document <CIT> and includes a control part, an insulating sheath, and a cutting part. A distal end of the control part is connected to a proximal end of the insulating sheath. The cutting part includes a cutting electrode, a passive electrode, a cutting electrode wiring terminal that may be connected to the cutting electrode, a passive electrode wiring terminal that may be connected to the passive electrode, a cutting electrode conductor connecting the cutting electrode and the cutting electrode wiring terminal, and a passive electrode conductor connecting the passive electrode and the passive electrode wiring terminal. The cutting electrode and the passive electrode are provided on a distal end of the insulating sheath and are respectively connected to the control part through the cutting electrode conductor and the passive electrode conductor.

However, both the foregoing technical solutions can be improved. First, an active electrode (that is, the foregoing high-frequency treatment part and cutting part) does not have an obvious thermal effect, and a cutting speed is relatively slow, resulting in limited clinical application. Second, an area of contact between a passive electrode and tissue is relatively small, and tissue may be burned accidentally. Third, in both the solutions, the passive electrode and the active electrode are relatively close, the two electrodes may contact or a current may flow through tissue fluids between the electrodes to cause a short circuit failure. Fourth, in a surgical instrument for an endoscope, treatment instruments such as electrocoagulation forceps, biopsy forceps, needle knives, and the like in addition to snares and papilla incision knives need to be electrified to perform incision, cauterization, hemostasis, among other work. The passive electrode in the foregoing technical solution has relatively low adaptability.

Based on this, to overcome the disadvantages in the prior art, the present invention provides a treatment apparatus for an endoscope as defined in claim <NUM> attached. Preferred embodiments of the invention are defined in claims dependent upon claim <NUM> attached. The structural design is appropriate, the cutting speed is relatively high, the risk of passive electrode burns is relatively low, and adaptability is provided.

The beneficial effects of the present invention are as follows:
The first electrode performs an electrical operation on a human body, and a current that enters the human body is looped through the second electrically conductive part instead of flowing all over the human body, so as to avoid damage to other organs or electronic apparatuses (for example, a pacemaker) in the human body, thereby ensuring the safety of the entire operation. Provided that electrical requirements can be satisfied, the second electrode may be provided at any position in the endoscope, so that a sufficiently large area of contact between the second electrically conductive part and the human body is ensured to fully guide out a current. A space of contact between an outer side of the endoscope body of the endoscope and tissue is fully used to increase a conductive area of a contact part through which a current is guided out from human body tissue in a return path, so that while the risk of burns is reduced, a thermal effect is further improved, thereby improving the security and operation efficiency of endoscopic surgery, and ensuring further clinical popularization and application of the treatment apparatus for an endoscope.

Sheath <NUM>, first cavity <NUM>, second cavity <NUM>, operating wire <NUM>, cutting part <NUM>, ESD knife <NUM>, electric snare <NUM>, electrocoagulation forceps <NUM>, electric biopsy forceps <NUM>, conductor cavity <NUM>, cutting wire <NUM>, anchor <NUM>, drive part <NUM>, sliding ring <NUM>, endoscope body <NUM>, instrument passage <NUM>, transparent cover <NUM>, expandable frame <NUM>, return path <NUM>, first electrically conductive part <NUM>, second electrically conductive part <NUM>, sliding contact part <NUM>, third electrically conductive part <NUM>, fourth electrically conductive part <NUM>, feeding electrode <NUM>, passive electrode <NUM>, active electrode <NUM>, tissue operation mechanism <NUM>.

The present invention is further described below in detail, but the implementations of the present invention are not limited thereto.

As shown in <FIG>, a treatment apparatus for an endoscope includes: a first electrode, including an electrical treatment part and an operating wire <NUM>; a second electrode, configured to be provided inside the endoscope (not shown), and including a first electrically conductive part <NUM> and a sliding contact part <NUM> electrically connected to the first electrically conductive part <NUM>, the first electrically conductive part <NUM> being configured to contact a human body; and a sheath <NUM>, provided on a surface thereof with a second electrically conductive part <NUM>, where the operating wire <NUM> is passed through the sheath <NUM>, the sheath <NUM> is passed through the endoscope, and the sheath <NUM> is movable back and forth in an instrument passage of the endoscope. Specifically, the sheath <NUM> of the present invention is passed through the instrument passage <NUM> of the endoscope and is controlled by a drive part <NUM> (a sliding ring <NUM> is provided on the drive part <NUM>) connected outside a body to move freely forward or backward in the instrument passage <NUM>.

As shown in <FIG>, a first cavity <NUM> extending in an axial direction and having openings at two ends is formed in the sheath <NUM>. The sheath <NUM> is made of an insulating material, for example, insulating resin. In addition, preferably, the sheath <NUM> needs to be flexible enough to bend and move forward or backward along lumen tissue and the like in an organism.

As shown in <FIG>, <FIG>, and <FIG>, the first cavity <NUM> and a second cavity <NUM> are formed in the sheath <NUM>. The conductive operating wire <NUM> is passed through the first cavity <NUM> in a manner of moving freely forward or backward. The electrical treatment part (including, but is not limited to, an endoscopic submucosal dissection (ESD) knife <NUM>, an electric snare <NUM>, electrocoagulation forceps <NUM>, electric biopsy forceps <NUM>, and a papilla sphincterotomy hereinafter) is provided at a distal end of the operating wire <NUM>, and in this embodiment, is an electric snare. The operating wire <NUM> is conductive. A proximal end of the operating wire <NUM> is electrically connected to an active electrode <NUM> of a feeding electrode <NUM> (in the present invention, the feeding electrode <NUM> includes a passive electrode <NUM> and the active electrode <NUM>, referring to <FIG> for details). Although the operating wire <NUM> is conductive (or even the operating wire <NUM> and the electrical treatment part may be one overall conductor) in this embodiment, the specific material and performance of the operating wire <NUM> are not limited, provided that the electrical treatment part can be manipulated to move forward or backward. Alternatively, the operating wire <NUM> may be not conductive, and a conductor wire is additionally used between the electrical treatment part and an electrode to establish a conductive connection.

An expandable frame is sleeved over a front end of the endoscope. As shown in <FIG>. The expandable frame <NUM> includes a sleeve <NUM> sleeved over the endoscope and a transparent cover <NUM>. The transparent cover <NUM> is made of a transparent insulating material. The transparent cover <NUM> may block a part of the view of a camera <NUM> (as shown in <FIG> and <FIG>) of the endoscope, and the endoscope may obtain an image through the transparent cover <NUM>. The first electrically conductive part <NUM> is provided on a periphery of the expandable frame. A diameter of a peripheral surface of the expandable frame is greater than a diameter of a peripheral surface of the endoscope. The sliding contact part <NUM> may be provided on the expandable frame.

<FIG>, <FIG>, and <FIG> further show other implementations in which the expandable frame <NUM> is installed on the treatment apparatus for an endoscope. During use, the expandable frame <NUM> is assembled at a distal end of an endoscope body <NUM> of the endoscope, the first electrically conductive part <NUM> is provided on a periphery of the expandable frame, and the first electrically conductive part <NUM> has a relatively large surface area to fully contact human body tissue. Preferably, a structure of the first electrically conductive part <NUM> may be as follows: A conductive material is provided on a peripheral surface of the endoscope <NUM>, and the conductive material forms the first electrically conductive part <NUM>. The type of the conductive material may be selected as required. In addition, preferably, the sliding contact part <NUM> is provided on the expandable frame <NUM> and has conductive performance. A part of the sliding contact part <NUM> is electrically connected to the first electrically conductive part <NUM>, and another part of the sliding contact part <NUM> forms tight fit with a periphery of the sheath and is electrically connected to the second electrically conductive part <NUM>.

It should be noted that although the expandable frame <NUM> with a transparent cap <NUM> is provided in the foregoing embodiment, the foregoing two structures are not limited, provided that is an auxiliary apparatus for an endoscope can be tightly attached to a side wall of tissue and has a larger surface area than the sheath, so that the first electrically conductive part <NUM> may be attached to the peripheral surface of the peripheral surface of the expandable frame <NUM> and is connected to the second electrically conductive part <NUM> through the sliding contact part <NUM> to achieve the same effect. Preferably, as shown in <FIG>, the expandable frame <NUM> includes a sleeve <NUM>' and a flexible part or an elastic part <NUM> connected to the sleeve <NUM>', the sleeve <NUM>' is configured to be sleeved over the endoscope, and the sliding contact part <NUM> is fixed on an inner side of the expandable frame or an inner side of the sleeve <NUM>'. The flexible part or elastic part <NUM> provides particular cushioning for the sliding contact part <NUM> or applies particular pressure to keep electrical contact between the sliding contact part <NUM> and the second electrically conductive part <NUM>, so that the sliding contact part <NUM> is kept being configured to be electrically connected to the second electrically conductive part <NUM>.

Further, as shown in <FIG>, the second electrically conductive part <NUM> is fixed at a position, at a distance of L1 near a top end, on a periphery of a front section of the sheath <NUM>, and is conductive. An outer diameter of the second electrically conductive part <NUM> does not exceed an inner diameter of the instrument passage <NUM>. Moreover, referring to both <FIG> and <FIG>, the second cavity <NUM> is formed in the sheath <NUM>. A third electrically conductive part <NUM> having a conductive function is encapsulated in the second cavity <NUM>. The second electrically conductive part <NUM> is electrically connected to the third electrically conductive part <NUM>, and the second electrically conductive part <NUM> is electrically connected to a passive electrode <NUM> of the feeding electrode <NUM> through the third electrically conductive part <NUM>, and an external power supply supplies power to the electric snare. The present invention is not limited thereto. Alternatively, a layer of a conductive material is provided on an outer surface of the sheath <NUM>, and the conductive material forms the second electrically conductive part <NUM>. The type of the conductive material may be selected as required. The layer of the conductive material at least covers a peripheral surface of a part of the sheath <NUM>. The layer of the conductive material may be made very thin to reduce an increase in an additional volume. Preferably, the layer of the conductive material is made smooth to facilitate the movement of the sheath <NUM> in the instrument passage of the endoscope.

Although the third electrically conductive part <NUM> is encapsulated in the sheath <NUM> in this embodiment, a specific position of the third electrically conductive part <NUM> on the sheath is not limited, provided that the third electrically conductive part <NUM> is electrically isolated from the electric snare <NUM> in the first cavity <NUM> and is eventually electrically connected to the first electrically conductive part <NUM>. <FIG> shows several arrangement manners of the third electrically conductive part <NUM> in the sheath <NUM>.

Although the third electrically conductive part <NUM> has a linear shape in this embodiment, the specific shape and structure of the third electrically conductive part <NUM> are not limited, provided that the third electrically conductive part <NUM> can electrically connect the first electrically conductive part <NUM> to the feeding electrode and can bend in accordance with a flexible cavity.

A working manner of the present invention is described below. Before operations of endoscopic surgery are started, the expandable frame <NUM> with the first electrically conductive part <NUM> is assembled at a distal end of an endoscope body <NUM> of the endoscope, and the sheath <NUM> with the electric snare <NUM> is further inserted in the instrument passage <NUM> of the endoscope. Next, the endoscope is inserted in a cavity (for example, a digestive tract, a vagina) of a human body, and an image transmitted by the camera <NUM> is simultaneously observed. When a focus is reached, a sliding ring <NUM> on the drive part <NUM> is operated, the electric snare <NUM> is closed around tissue to be excised, and the first electrically conductive part <NUM> is tightly attached to tissue <NUM> on a side wall at the same time. Finally, the feeding electrode <NUM> is turned on, and a current flows through the active electrode <NUM> of the feeding electrode <NUM>, the electric snare <NUM>, the tissue to be excised, and a return path <NUM> (as shown in <FIG>, the return path <NUM> includes the first electrically conductive part <NUM>, the sliding contact part <NUM>, the second electrically conductive part <NUM>, and the third electrically conductive part <NUM>), and returns to the passive electrode <NUM> of the feeding electrode <NUM> to form a loop. High heat is generated at a contact position between the electric snare <NUM> and the tissue to be excised to excise the tissue. For the formation of the return path <NUM>, and when the sheath <NUM> is located in a preset position, the sliding contact part <NUM> contacts and is electrically connected to the second electrically conductive part <NUM> and the sheath <NUM> is in sliding fit with the sliding contact part <NUM>. The preset position is not necessarily a point, and it may be designed that when the sheath <NUM> slides within a particular range, the sliding contact part <NUM> can contact and be electrically connected to the second electrically conductive part <NUM>. In this way, the first electrically conductive part <NUM>, the sliding contact part <NUM>, the second electrically conductive part <NUM>, and the third electrically conductive part <NUM> form the return path <NUM> of the current guided out from the human body. In a conventional instrument for an endoscope, the return path <NUM> is not provided or no other manner is used to guide out a current, and a reliable electrical connection to the human body cannot be kept as well as in the present invention, easily resulting in accidental injury. Because the first electrically conductive part <NUM> is close to the electrical treatment part, a current that enters the human body is guided out by the first electrically conductive part <NUM> instead of flowing all over the human body. Therefore, a stronger current can be used, so as to obtain electrothermal efficiency that cannot be obtained by a conventional electric snare <NUM>, and the stronger current generates more heat at the focus. The description of the active electrode <NUM> and the passive electrodes <NUM> herein and in the context is only used for ease of recognizing a current direction in a same loop, and an actual flowing direction of a current is not limited. A high-frequency alternating current with a frequency not less than <NUM> usually flows in the formed loop.

It should be noted that the foregoing electrical contact and electrical connection means that a current can be in practice conducted. For such contact, two entities may contact or the entities may not contact (there is a gap) but complete conduction of a current by means of conductive liquids (for example, tissue fluids, and secretions) in a human body.

The preferred solutions and beneficial effects of this embodiment are as follows:.

In this embodiment, the first electrically conductive part <NUM> is provided on the expandable frame <NUM> of the endoscope. An outer diameter of the expandable frame <NUM> is greater than an outer diameter of the endoscope body <NUM> of the endoscope, and the outer diameter of the endoscope body <NUM> of the endoscope is greater than an outer diameter of the sheath <NUM>. Therefore, compared with the case in which the first electrically conductive part <NUM> is provided on the sheath <NUM>, when the first electrically conductive part <NUM> is provided on the expandable frame <NUM>, the first electrically conductive part <NUM> contacts a human body more easily to form an electrical loop, so as to ensure that "the electrical treatment part, the human body tissue, and the first electrically conductive part" form a stable current loop during surgery, thereby preventing the human body from burns.

Because the outer diameter of the expandable frame <NUM> > the outer diameter of the endoscope body <NUM> of the endoscope > the outer diameter of the sheath <NUM>, an area of contact between the first electrically conductive part <NUM> and the human body is large, a stronger surgical current may be used, and the surgery time is shortened. During surgery when a current is maintained within a safe current range, a length of safe contact of the first electrically conductive part <NUM> (the first electrically conductive part <NUM> provided inside the endoscope body <NUM>) provided on the expandable frame <NUM> is far less than a length of the first electrically conductive part <NUM> provided on the sheath <NUM>:
To facilitate description, for example, a diameter of a cutting head is <NUM>, an electrical cutting current is <NUM> mA, and an average surgery time is <NUM>. According to the regulations in <CIT> and IEC6060-<NUM>-<NUM>:<NUM>, a safe threshold of a contact current for a human body is 1000mA · s/cm<NUM>.

To describe a relationship between an arrangement position of a contact electrode and a requirement of a safe contact length L, it is assumed that a common digestive endoscope with a relatively small size, that is, a duodenoscope, is chosen for measurement. An outer diameter of the duodenoscope is d<NUM> = <NUM>, and a maximum outer diameter of the treatment apparatus does not exceed an inner diameter of an endoscope channel d<NUM> = <NUM>cm. (<NUM>) The first electrically conductive part <NUM> is provided on the sheath <NUM>.

It is assumed that when the first electrically conductive part <NUM> is provided on the sheath <NUM> (that is, the first electrically conductive part <NUM> is provided on the peripheral surface of the sheath <NUM> and has an annular shape), an area of contact between the first electrically conductive part <NUM> and a human body is: <MAT> where <MAT> means that assuming that the first electrically conductive part <NUM> has an annular shape surrounding the peripheral surface of the sheath <NUM> by one loop, a range of contact between the first electrically conductive part <NUM> and the human body tissue is <NUM>/<NUM> of the arc surface (that is, only <NUM>° of the circumferential <NUM>° contacts human body tissue).

To satisfy the safe threshold of the contact current for the human body: <MAT>.

Therefore, assuming that the first electrically conductive part <NUM> is provided on the sheath <NUM>, to satisfy the safe threshold of the contact current for the human body, a length of the first electrically conductive body <NUM> in an axial direction of the sheath needs to be greater than <NUM>, or otherwise a deep burn may occur in the human body during normal surgery. (<NUM>) The first electrically conductive part <NUM> is provided inside the endoscope body <NUM>.

Assuming that the first electrically conductive part <NUM> is provided inside the endoscope body <NUM>, a maximum area of contact with human body tissue is: <MAT>.

As may be seen from above, the required length of the first electrically conductive part in the safe range is L<NUM> » L<NUM>. When the first electrically conductive part is provided on the peripheral surface of the expandable frame, the safe contact length required to prevent a deep burn is shorter than the length of the first electrically conductive part provided on the peripheral surface of the sheath by approximately <NUM>%, so that the safe contact length can be reached more easily for the contact electrode during surgery, and the surgery is safer and more effective.

Embodiment <NUM> protects an endoscope. <FIG>, <FIG>, and <FIG> show three manners of guiding out a current via an endoscope. A fourth electrically conductive part <NUM> is provided inside the endoscope, and the fourth electrically conductive part <NUM> is electrically connected to the first electrically conductive part <NUM>.

In a first implementation, the fourth electrically conductive part <NUM> is provided on an inner wall of the instrument passage <NUM> of the endoscope. The first electrically conductive part <NUM> is provided on a periphery of the camera <NUM> at the distal end of the endoscope body <NUM>, and is electrically connected to the fourth electrically conductive part <NUM> in the instrument passage <NUM> directly or through the sliding contact part <NUM>.

In a second implementation, the fourth electrically conductive part <NUM> is provided on an outer wall of the endoscope body <NUM> of the endoscope, and the fourth electrically conductive part <NUM> and the first electrically conductive part <NUM> are integrally provided on a periphery of the endoscope body <NUM> to form a whole.

In a third implementation, the fourth electrically conductive part <NUM> is provided on the inner wall of the instrument passage <NUM> of the endoscope. The first electrically conductive part <NUM> is provided on the periphery of the camera <NUM> at the distal end of the endoscope body <NUM>, and the sliding contact part <NUM> passes through a side wall of the endoscope body <NUM> to electrically connect the first electrically conductive part <NUM> to the fourth electrically conductive part <NUM> in the instrument passage <NUM>.

Preferred solutions and beneficial effects of this embodiment are as follows:.

Embodiment <NUM> protects an expandable frame for another endoscope. As shown in <FIG>, a conductive material is provided on the peripheral surface of the expandable frame <NUM>, and the conductive material forms the first electrically conductive part <NUM>. A proximal end of the first electrically conductive part <NUM> is electrically connected to the fourth electrically conductive part <NUM>. The fourth electrically conductive part <NUM> (which may be a conductor wire) is arranged along the endoscope body <NUM>, is guided out from a proximal end of the endoscope body <NUM>, and is electrically connected to the passive electrode <NUM>. During working, the expandable frame <NUM> is installed on an ordinary endoscope, so that the expandable frame <NUM> is tightly attached to human body tissue. An existing monopolar instrument is inserted in the instrument passage <NUM> at the same time. A power supply is turned on after a focus is reached, and a working circuit is formed among an electrical treatment part of the monopolar instrument, tissue to be treated, and the first electrically conductive part <NUM>, so as to complete surgical operations.

The differences between Embodiment <NUM> and Embodiment <NUM> lie in that the fourth conductive body instead of the sliding contact part is provided on the expandable frame, and the fourth conductive body is passed through the endoscope or provided outside the endoscope. Preferably, the fourth conductive body is a conductor wire, and the conductor wire is passed through the endoscope or provided outside the endoscope. The remaining shape of the expandable frame may be consistent with that in Embodiment <NUM>. Such an expandable frame is conveniently used. The first electrically conductive part of the expandable frame is provided on a periphery of the expandable frame and contacts a human body and guides out a current in the human body. Next, the fourth electrically conductive part guides out the current in the human body, so as to provide a passage for guiding out the current from the human body. The fourth electrically conductive part may be easily installed inside the endoscope in a sleeving manner, it is not necessary to make additional changes to the endoscope, thereby achieving high compatibility and a wide use range.

The technical solutions in the foregoing embodiments may be implemented separately or implemented in combination, but is not limited to the foregoing embodiments. For example, the following variants may be used.

For example, to perform ESD surgery, as shown in <FIG> and <FIG>, the electric snare <NUM> is replaced with an ESD knife <NUM> having a head part extending in an axial direction of the operating wire. The head part <NUM> may be a needle knife or may be a T-shaped knife, a star-shaped knife, provided that the head part is applicable to ESD surgery. <FIG> show several shapes of the electrical treatment part. The structural parts other than the ESD knife <NUM> are the same as those in the foregoing embodiments, and the details of these parts are omitted herein.

For another example, to perform hemostasis during surgery, as shown in <FIG> and <FIG>, the electric snare <NUM> is replaced with the electrocoagulation forceps <NUM> having a pair of holding parts that can be opened or closed and can incise living tissue. The structural parts other than the electrocoagulation forceps <NUM> are the same as those in the foregoing embodiments, and the details of these parts are omitted herein.

For still another example, to perform biopsy and hemostasis, as shown in <FIG> and <FIG>, the electric snare <NUM> is replaced with the electric biopsy forceps <NUM>. The structural parts other than the electric biopsy forceps <NUM> are the same as those in the foregoing embodiments, and the details of these parts are omitted herein.

For yet another example, to perform endoscopic retrograde cholangiopancreatography (ERCP), as shown in <FIG>, the electric snare <NUM> is replaced with a cutting wire <NUM> having a papilla sphincterotome with a function of incising papillary sphincters. The papilla sphincterotome includes a conductor cavity <NUM> extending longitudinally in the sheath <NUM> along the sheath <NUM>. The conductor cavity <NUM> is equivalent to the first cavity <NUM> in the embodiment of the electric snare <NUM>. The cutting wire <NUM> is accommodated in the conductor cavity. The cutting wire <NUM> is passed through an anchor <NUM> at a distance L from a distal end of the sheath and is joined to the distal end of the sheath, so that the cutting wire <NUM> and the distal end form a bow-shaped cutting part <NUM>. The cutting wire <NUM> is securely joined to the sheath <NUM> at the anchor. A proximal end of the cutting wire <NUM> is electrically connected to the operating wire <NUM> having conductive performance. The remaining structural parts in this embodiment are the same as those in the foregoing embodiments, and the details of these parts are omitted herein.

In addition, preferably, as shown in <FIG>, the sliding contact part <NUM> may further include a fifth electrically conductive part <NUM> and a sixth electrically conductive part <NUM>. The fifth electrically conductive part <NUM> may ensure a stable connection between the sliding contact part and the second electrode. The sixth electrically conductive part <NUM> is configured to be electrically connected to the first electrically conductive part <NUM>. In <FIG>, the fifth electrically conductive part is a steel spring ball. A highest point of the steel spring ball protrudes from an extension line of the instrument passage of the endoscope, and a tail of the steel spring ball is inserted in the expandable frame. The fifth electrically conductive part is electrically connected to the first electrically conductive part <NUM> through the sixth electrically conductive part. In addition, there may be another implementation of the fifth electrically conductive part <NUM>. For example, the fifth electrically conductive part <NUM> may be provided as an electrically conductive ring. A central line of the electrically conductive ring is consistent with a central axis of the instrument passage of the endoscope, and an inner diameter of the electrically conductive ring is consistent with an inner diameter of the instrument passage. In this case, the sixth electrically conductive part <NUM> is electrically connected to the first electrically conductive part <NUM> and the electrically conductive ring. The electrically conductive ring is used to keep stable contact of the electrically conductive parts in all directions and further reduce manufacturing costs. The fifth electrically conductive part may also be an electrically conductive prism. A central line of the electrically conductive prism is consistent with a longitudinal axis of the endoscope, and the electrically conductive prism protrudes from an axial extension line of a wall of the instrument passage of the endoscope. Alternatively, the fifth electrically conductive part may be an insertion tube inserted at a distal end of the instrument passage, and may ensure stable matching between the sliding contact part and the instrument passage.

In addition, the first electrically conductive part <NUM> may also be arranged in another manner.

In a variant, as shown in <FIG>, the first electrically conductive part <NUM> is provided in the middle of the endoscope body <NUM> of the endoscope. The return conductor <NUM> is provided longitudinally along the endoscope body <NUM>, and is electrically connected to the first electrically conductive part <NUM>. The feeding power supply <NUM> includes the passive electrode <NUM> and the active electrode <NUM>. The passive electrode <NUM> is electrically connected to the third electrically conductive part <NUM> (or the fourth electrically conductive part <NUM>), and is guided out at the proximal end of the endoscope body <NUM>. In addition, the active electrode <NUM> is electrically connected to a high-frequency treatment part, and is guided out from the drive part <NUM>. Although the third electrically conductive part <NUM> (or the fourth electrically conductive part <NUM>) is provided inside the endoscope body <NUM> in this embodiment, a specific position of arranging the third electrically conductive part <NUM> is not limited, provided that the third electrically conductive part <NUM> (or the fourth electrically conductive part <NUM>) can be electrically connected to the first electrically conductive part. The third electrically conductive part <NUM> (or the fourth electrically conductive part <NUM>) may be arranged on the sheath <NUM>, and is electrically connected to the first electrically conductive part <NUM> through a conduction mechanism provided on an inner side of the first electrically conductive part <NUM>. In this case, the passive electrode <NUM> and the active electrode <NUM> are both guided out from the drive part <NUM>.

In another variant example, <FIG>, and <FIG> show an endoscope. A first electrically conductive part <NUM> of the endoscope covers an outer surface of the endoscope body <NUM>. The return conductor <NUM> is electrically connected to the proximal end of the first electrically conductive part <NUM>, and is guided out from the proximal end of the endoscope body <NUM> to the passive electrode <NUM>. The active electrode <NUM> is electrically connected to the high-frequency treatment part, and is guided out from the drive part <NUM>.

In another variant example, <FIG>, and <FIG> show another endoscope. The first electrically conductive part <NUM> of endoscope covers a peripheral surface at the distal end of the camera <NUM>. The return conductor <NUM> is arranged on an inner wall of the instrument passage <NUM> and is electrically connected to the passive electrode <NUM>, and the return conductor <NUM> and the active electrode <NUM> are then guided out together from the drive part <NUM>.

In another variant example, <FIG> show another endoscope. The return conductor <NUM> of the endoscope is a conductor wire arranged on an outer side of the endoscope body <NUM>, and during use, the return conductor <NUM> coordinate with a high-frequency treatment apparatus having the first electrically conductive part <NUM>. The conductor wire is electrically connected to the first electrically conductive part <NUM>.

In the present invention, a space of contact between an outer side of the endoscope body of the endoscope and tissue is fully used to increase a conductive area of a contact part between the treatment apparatus for an endoscope and tissue in a return path, so that while the risk of bipolar instrument burns is reduced, a thermal effect between the high-frequency treatment part and tissue to be excised and electrocoagulated is further improved, thereby improving the security and operation efficiency of endoscopic surgery, and ensuring further clinical popularization and application of bipolar instruments.

The technical features in the foregoing embodiments may be randomly combined. For simplicity of description, all possible combinations of the technical features in the foregoing embodiments are not described. However, it should be considered that these combinations of technical features fall within the scope recorded in the specification provided that these combinations of technical features do not have any conflict.

Claim 1:
A treatment apparatus for an endoscope, comprising:
a first electrode, comprising an electrical treatment part (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>) and
an operating wire (<NUM>);
a second electrode, configured to be installed on the endoscope, the second electrode comprising a first electrically conductive part (<NUM>), characterized in that the second electrode further comprises a sliding contact part (<NUM>) electrically connected to the first electrically conductive part (<NUM>), and the first electrically conductive part (<NUM>) being configured to contact a human body; and
a sheath (<NUM>), provided on a surface of said second electrode with a second electrically conductive part (<NUM>), wherein
the operating wire (<NUM>) is configured to be passed through the sheath (<NUM>), the sheath (<NUM>) is configured to be passed through the endoscope, such that when the sheath (<NUM>) is located in a preset position, the sliding contact part (<NUM>) contacts and is electrically connected to the second electrically conductive part (<NUM>) and the sheath (<NUM>) is in sliding fit with the sliding contact part (<NUM>).