Electrosurgical hand instrument and contact body for an electrosurgical hand instrument

Abstract

The invention provides an electrosurgical hand instrument and a contact body for an electrosurgical hand instrument, whereby not only the desired cleanness, but also the desired safety can be achieved. This is solved in that the contact body (17) for an electrosurgical hand instrument has a high-frequency cable (40) for accommodating a mirror set guide (18) and for connecting at least one electrical contact of an electrode tool (23) of the hand instrument, which is fixedly connected to the contact body (17). The electrode tool (23) can be supplied with a high-frequency voltage by means of the at least one electrical contact via the high-frequency cable (40). The other end of the high-frequency cable (40) can be connected to a high-frequency generator, for example.

Description

Technical Field

[0001] This invention relates to a contact body for use in electrosurgical handheld instruments. The invention also relates to electrosurgical handheld instruments. Background Technology

[0002] Electrosurgical handheld instruments, such as electrosurgical resectoscopes, are primarily used in endoscopic applications in urology and gynecology, where they are preferably used for treatments in the bladder, uterus, or prostate area. However, the application of these instruments is not limited to human body areas, but also includes the treatment of other organs in the lower body.

[0003] The type of instrument described herein, such as an electroresection endoscope, is typically equipped with a transporter. To treat diseased tissue, the electroresection endoscope is inserted into the patient through an opening in a long, narrow shaft. Various medical instruments can be arranged within the shaft tube for treating and / or examining the patient. For example, for high-frequency surgical instruments, electrodes capable of receiving high-frequency alternating current and located distal to the electrode holder can be inserted into the shaft tube. For treatments to be performed on the patient, such as cutting of diseased tissue, the electrode holder, containing the electrodes, can be movably positioned on the electroresection end relative to the shaft tube and along the shaft axis. Here, the electrodes or tools are located distal to the shaft tube.

[0004] The electrode holder also engages at its proximal end with a support frame, from which it can move along the shaft axis. This allows for the cutting motion of the electrode. The support frame is typically detachably engaged with the shaft tube. It has a movable contact body, also known as a slide. At the contact body, the electrode holder can be mechanically disengaged from at least one electrical contact.

[0005] The operation or longitudinal feeding of the support frame is performed by the surgeon. For this purpose, the support frame is equipped with a handle unit having a first handle and a second handle. The surgeon grips the first handle to operate the support frame, and the second handle may have finger units or a thumb ring. The first handle can be fixed to the stationary body of the support frame. The second handle can be fixed to a contact body.

[0006] The movement of the support frame overcomes the spring tension, which in such frames is typically designed as a leaf spring or a helical torsion spring (Schenkelfeder). One end of the spring is fixed to the contact body or slide, and the other end is fixed to the end of the reinforcing tube or the mirror assembly guide plate. The spring type or spring mechanism operation depends on whether the support frame is active or passive. In the case of an active support frame, the spring is designed as a compression spring; in the case of a passive support frame, it is designed as a tension spring.

[0007] Typically, electrode cutting is performed by the retraction motion of the support frame. In an active support frame, the electrode is pulled back (proximal) against the spring force. In a passive support frame, the electrode first moves forward (distal) against the spring force so that it can then cut through the tissue during the subsequent return motion (proximal) caused by the unloading of the spring.

[0008] Furthermore, the endoscope assembly can be guided through the shaft of the instrument described herein. The rod-shaped or bar-shaped endoscope assembly is guided from the proximal end through a reinforcing tube, also known as the endoscope assembly guide tube, of the support frame. In the following embodiment, the endoscope assembly, as a rod-lens system or a bundle of glass fibers, is guided from the proximal end to the distal end via the shaft. The distal end of the endoscope assembly is directly aligned with the surgical area or electrode working point. At the proximal end of the endoscope assembly, the surgeon can observe and treat the patient through an eyepiece or camera.

[0009] The electrode holder or electrode tool is connected to at least one electrical contact of the contact body, and both are thus moved together into or through the shaft. By operating the second handle component relative to the first handle component, the contact body can therefore move back and forth along the shaft axis through the reinforcing tube together with the electrode holder.

[0010] In known systems, the reinforcing tube is fixedly connected to the carrier or body during manufacturing. At the proximal end of the reinforcing tube, it is welded to the lens assembly guide plate. Before connecting the reinforcing tube to the body, the contact body is moved onto the reinforcing tube. For this purpose, the contact body has a corresponding hole parallel to the axis of the shaft. The hole size is set such that the contact body or slide can only easily move onto the reinforcing tube.

[0011] A particularly significant disadvantage is that not only is the manufacturing of the support frame time-consuming, but the cost of repairing and replacing components is also increased. Especially for contact replacements caused by maintenance issues or defects, it is laborious to separate the reinforcing tube from the main body in order to extract the contact.

[0012] Electrical energy can be supplied to an electrode holder or electrode through a mechanical connection between the contact body and at least one electrical contact of the electrode holder. For this purpose, the contact body has at least one opening into which at least one electrical contact of the electrode holder can be guided for a separable connection. The opening, blind hole, or orifice is designed such that a high-frequency voltage can be applied via an interlocking socket in a known contact body. For this purpose, a plug is typically inserted into the socket, and the plug can be connected to a high-frequency generator via a wire or cable. A particularly disadvantageous aspect of known contact bodies or slides is the difficulty in cleaning the openings, holes, and cavities. In particular, openings or blind holes used to accommodate electrical contacts can only be cleaned at a higher cost or cannot be cleaned as thoroughly as desired. Furthermore, the contact surfaces between the socket and the cable wear down after repeated use, thereby adversely affecting the functionality of the electrical connection. A weakened electrical connection between the electrode tool and the contact body can, in some cases, lead to electrical arcing or erosion at the contact site. Aside from the inability to perform treatment due to instrument malfunction, this also poses a safety hazard to personnel involved. Summary of the Invention

[0013] In view of this, the present invention is based on the objective of providing an electrosurgical handheld instrument and a contact for the electrosurgical handheld instrument, thereby achieving the desired cleanliness and safety.

[0014] To accomplish this task, the contact body possesses the features of the first aspect of the invention. Therefore, it is specified that a contact body with an electrosurgical instrument has a high-frequency wire fixedly connected to the contact body to accommodate a guide mechanism for the endoscope assembly and at least one electrical contact for engaging an electrode tool of a handheld instrument. Through this high-frequency wire, the electrode tool can withstand a high-frequency voltage via the at least one electrical contact. The other end of the high-frequency wire can, for example, be connected to a high-frequency generator. With the fixed connection of the high-frequency wire to the contact body, the corresponding socket into which the high-frequency plug is inserted is redundant. Thus, the number of openings and cavities within the contact body is reduced. The invention here specifies that the contact body is designed as a unidirectional contact body. That is, the contact body, like the electrode tool, is used only for a single surgery and is subsequently disposed of. It is conceivable that the unidirectional contact body is packaged together with the unidirectional electrode tool. With the design of the contact body of the present invention, the requirements for cleanliness and safety can be met.

[0015] Furthermore, the present invention may specify a separable engagement between a component of the handle unit and the contact body. This separable engagement may be formed on the contact body as at least one engagement mechanism. This at least one engagement mechanism may, for example, be separable to a first handle member and / or a second handle member of the handle unit. Through this separable engagement between the contact body and the handle unit or handheld device, the contact body, along with the integral high-frequency cable, can be easily engaged and disengaged from the handheld device. Therefore, the contact body can be easily disengaged or detached from the handheld device after treatment, and a new contact body can be attached to the handheld device for further treatment. This quick and uncomplicated replacement makes laborious cleaning of the contact body unnecessary. Additionally, sufficient safety for the personnel can be ensured by using a new contact body. It is also conceivable that the contact body may have an operating element for manipulating it, thereby allowing for a firm grip on the contact body to clamp it onto the lens guide tube or pull it out. This operating element may be, for example, an elastically deformable mechanism associated with the contact body.

[0016] Preferably, the invention further specifies that an engagement mechanism is formed within the contact body to allow for detachable engagement with a component of the handle unit, particularly the second handle member. This engagement mechanism is therefore an integral part of the contact body. For example, the engagement mechanism can be a slit-like receptacle or one or more holes in which the second handle member can be detachably engaged or locked with corresponding complementary elements of shape. The connection can be, for example, a locking connection, a clamping connection, a plug-in connection, a magnetic connection, etc. Here, the second handle member can be locked into the slit-like receptacle of the contact body. At the end of the slit-like receptacle, which preferably extends across the entire width of the contact body, a widening or hole can be provided, into which the second handle member can be inserted for detachable engagement. Alternatively, it is conceivable that a spring-loaded pin of the second handle member is inserted into a hole-shaped receptacle within the contact body. By releasing the pin's elasticity, the second handle member can be separated from the contact body.

[0017] If the electrosurgical handheld instrument is an electrosurgical resectoscope with a passive support frame, then the separable connection between the second handle and the contact body is sufficient to utilize the handheld instrument in the manner described above. The separable connection between the components is designed to have the strength required to prevent unintentional separation during treatment. Similarly, the connection is designed so that it can be separated by the person being treated without excessive manual force or the use of other tools.

[0018] It is also conceivable that the slit-like reservoir within the contact body is oriented perpendicular to the longitudinal axis of the contact body in order to connect to the second handle component. Through the orientation of the reservoir, the invention described herein is incorporated into the operation of existing handle units, which have an elastic action parallel to the longitudinal axis of the contact body or the handheld device.

[0019] An alternative embodiment of the invention may specify that the engagement mechanism is designed as a locking mechanism, bayonet engagement, clamping, plugging, or other mechanical connection. Here, a detachable connection with the first handle of the handheld device can be established by an engagement mechanism preferably located at the distal end of the contact body. In this embodiment of the contact body, the contact body is specified to be directly connected to the first handle, as is the case, for example, with the active support frame of an electrosurgical endoscope. The contact body is thus kinetically engaged with the first handle through the aforementioned mechanical or magnetic engagement. The engagement can be detached and secured in the simple manner described above.

[0020] The invention may also preferably specify that the integral high-frequency wire is connected to at least one, preferably two, sockets to accommodate one contact of the electrode tool, and said at least one socket is integrated into the contact body. If the surgical handheld instrument has an electrode tool with only one electrical contact, the contact body also has only one corresponding receptacle. However, if the electrode tool has two contacts, such as an active contact and a return contact, the contact body may accordingly have two receptacles for electrical contact of the contacts. The receptacle is also arranged parallel to the orifice within the contact body and may be designed as a blind orifice or extend through the entire object. The receptacle is connected within the contact body to the integral high-frequency wire. This allows for direct voltage supply to the electrode by a high-frequency generator.

[0021] The invention preferably further specifies that the contact body has a slit parallel to the through hole. The hole is configured to accommodate a scope guide mechanism. The scope guide mechanism can be designed, for example, as a reinforcing tube or tubular shaft to accommodate a rod-shaped scope assembly. The hole extends from one end of the contact body to the opposite end, wherein the hole is oriented parallel to the longitudinal axis of the electrosurgical handheld instrument. According to the invention, the slit is designed such that the contact body can be inserted into the tubular scope guide mechanism, whereby the scope guide mechanism moves through the slit into the hole. It is also conceivable that the tubular scope guide mechanism can be pressed into the hole through the slit. Due to the slit, the contact body can therefore also be fixed to at least a nearly assembled handheld instrument or a support frame of the handheld instrument. Similarly, the contact body can be separated from the scope guide mechanism after treatment, specifically without the need to disassemble the large-circumference handheld instrument for this purpose.

[0022] The invention can also specifically specify that the slit extends from the outer wall of the contact body through the hole, where the tubular lens guide mechanism can be guided into the hole through the slit. The slit and the hole thus together form a recess within the contact body. Finally, the slit is a widening of the hole's inner cavity. Through this widening, the lens guide mechanism can be supplied to and removed from the hole in a simple manner. As long as the slit design of the widening is not excessively wide, the sliding connection between the lens guide mechanism and the inner wall of the hole remains unchanged. Conversely, the manipulation of the handheld device remains unaffected by the slit.

[0023] Another advantageous embodiment of the invention may specify that a plane extending parallel and centrally between the two sidewalls of the slit intersects the central axis of the hole. The relative orientation of the sidewalls and the hole allows for particularly advantageous guidance of the lens assembly guide mechanism into the hole. It is also conceivable that the aforementioned plane is slightly deviated from the central axis. This simplifies the insertion or removal of the lens assembly guide mechanism relative to the hole.

[0024] A highly advantageous embodiment of the invention specifies that the width of the slit, that is, the spacing between the sidewalls, is smaller than the aperture. Preferably, the aperture can have a diameter of 3 mm to 6 mm, more preferably 4 mm to 5 mm, especially 4.6 mm, and the slit can have a width of 2 mm to 5 mm, more preferably 3 mm to 4 mm, for example 3.5 mm. The aperture is always slightly larger than the diameter of the tubular mirror assembly guide mechanism.

[0025] It has proven particularly preferred that the ratio of the slit width, especially the shortest distance between the slit sidewalls, to the aperture be 0.6 mm to 0.9 mm, preferably 0.7 mm to 0.8 mm, and especially 0.76 mm. This width-to-diameter ratio is especially favorable for simple insertion of the lens assembly guide mechanism and for providing sufficient sliding resistance to the contact body on the lens assembly guide mechanism. If the ratio is too small, there is a particular risk of plastic deformation of the component. If the ratio is too large, guidance is no longer guaranteed. These values ​​are applicable to PTFE and can vary depending on the material.

[0026] The contact described herein for electrosurgical handheld instruments can also be designed as a slide for an active or passive electrosurgical resectoscope. It has been shown that plastics, especially PTFE, are particularly preferred for the contact due to material properties such as low sliding resistance, high electrical resistance, smooth surface, and good processability. However, it is also conceivable that the contact could be made from other fluoropolymers such as PFA. PEEK has also proven advantageous. Another possible embodiment involves the contact being made of a reversibly deformable material, which simplifies its movement onto the endoscope guide mechanism. Here, the slit is slightly elastically opened during contact installation. When the contact is removed, the slit is widened again to simplify removal.

[0027] An electrosurgical handheld instrument, designed to address the aforementioned tasks, possesses the features of the twelfth aspect of the invention. Accordingly, the handheld instrument, preferably a retractor with an active or passive support frame, has an electrode tool having an electrode at its distal end and at least one electrical contact at its proximal end. Additionally, the handheld instrument has a handle unit comprising a first handle member and a second handle member. Furthermore, the instrument has a tubular shaft engaged proximally to the first handle member and a scope guide mechanism for receiving the scope assembly. This scope guide mechanism is guided through a contact body, on which the second handle member and a spring are also fixed, and at least one housing for the electrical contact of the electrode tool. According to the invention, the contact body is designed according to at least one of the foregoing descriptions. Attached Figure Description

[0028] The preferred embodiments of the present invention will be explained in detail below with reference to the figures, wherein:

[0029] Figure 1 A schematic diagram of an electrosurgical resection device is shown.

[0030] Figure 2 A perspective view of the mirror assembly guide mechanism is shown.

[0031] Figure 3 A perspective view of the contact body is shown, and

[0032] Figure 4 Showing according to Figure 3 Side view of the contact body.

[0033] List of reference numerals

[0034] 10 Electrosurgical resection mirror

[0035] 11. Support frame

[0036] 12 shafts

[0037] 13 Main Body

[0038] 14 handle units

[0039] 15 First Hand Item

[0040] 16 Second Handle Component

[0041] 17 Contact Body

[0042] 18 Lens Group Guiding Mechanism

[0043] 19 holes

[0044] 20-lens guide plate

[0045] 21 Spring components

[0046] 22 Inner tube

[0047] 23 Electrode Tools

[0048] 24 electrodes

[0049] 25 Thumb rings

[0050] 26 Guiding Mechanism

[0051] 27 seats

[0052] 29 lens groups

[0053] 30 eyepieces

[0054] 31 holes

[0055] 32 seams

[0056] 33 End side

[0057] 34 end side

[0058] 35 outer wall

[0059] 36 Sidewalls

[0060] 37 Sidewall

[0061] 38 adapter connectors

[0062] 39 buttons

[0063] 40 High-frequency wires

[0064] 41 seats Detailed Implementation

[0065] exist Figure 1 The image schematically illustrates a possible embodiment of an electrosurgical handheld instrument, namely an electrosurgical resectoscope 10. The electrosurgical resectoscope 10 has a support frame 11 on which an elongated tubular shaft 12 can be fixed. The shaft 12... Figure 1 It is indicated by a shading line and is fixed to the main body 13 of the support frame 11 at the proximal end.

[0066] In addition to the main body 13, the support frame 11 also has a handle unit 14. The handle unit 14 has a first handle member 15 and a second handle member 16. The first handle member 15 is fixedly mounted on the main body 13, while in the embodiment of the support frame 11 shown here, the second handle member 16 is assigned to the contact body 17.

[0067] The contact body 17 can slide on the tubular mirror guide mechanism 18 or the mirror guide tube. For this purpose, the contact body 17 has a hole 19, the diameter of which is slightly larger than the diameter of the mirror guide mechanism 18. Because the contact body 17 can move back and forth on the mirror guide mechanism 18 along the longitudinal direction of the electrosurgical mirror 10 or the longitudinal axis of the shaft 12, the contact body 17 is also referred to as a slide.

[0068] Lens guide mechanism 18 is remotely connected to adapter 38. Figure 2 The tubular lens guide mechanism 18 is connected to the main body 13 or the inner tube 22, and a lens guide plate 20 is fixed at the proximal end of the lens guide mechanism 18. The tubular lens guide mechanism 18 extends through the lens guide plate 20, so that the lens guide mechanism 18 can be approached from the proximal side.

[0069] The second handle 16 or contact 17 is connected to the mirror assembly guide plate 20 via a spring 21. The spring 21 may be a tension spring.

[0070] The inner tube 22 extends distally from the main body 13. The inner tube 22 may also extend proximally through the main body 13 and connect to the lens guide mechanism 18. Similarly, it is conceivable that the inner tube 22 and the lens guide mechanism 18 are designed as a single unit, or that the lens guide mechanism 18 extends distally through the main body 13.

[0071] Electrode tool 23 extends parallel to inner tube 22. Electrode tool 23 is guided through body 13 and mechanically disengaged to contact body 17 within receiver 27 by at least one proximal contact. A locking mechanism may be provided within contact body 17, which is activated by button 39. Figure 3 and Figure 4 It is separable and can be secured. A locking mechanism locks at least one proximal end or contact of the electrode tool 23 within the contact body 17. The button 39 or locking mechanism can be spring-preloaded and can be easily operated with one finger.

[0072] At the distal end, the electrode tool 23 has an electrode 24. The electrode 24 can receive a high-frequency voltage. With the aid of plasma formed at the electrode 24, diseased tissue can be treated or cut. For this purpose, the surgeon moves a second handle component 16 with a thumb ring 25 relative to the first handle component 15. To stabilize the electrode tool 23, it can be guided through a guide mechanism 26 at the inner tube 22.

[0073] To apply a high-frequency voltage to electrode 24, the receptacle 27 of the proximal contact of electrode tool 23 can make electrical contact. For this purpose, contact body 17 has at least one socket (not shown in the figure). The socket is in electrical contact with at least a portion of the inner wall of receptacle 27. Receptacle 27 or socket is connected within contact body 17 to high-frequency wire 40. High-frequency wire 40 is integrally connected to contact body 17. High-frequency wire 40 has a plug at its other end (not shown), which can be connected to a high-frequency generator. Therefore, contact body 17, together with high-frequency wire 40, is provided or supplied as a unit.

[0074] The present invention can specify that the unit consisting of the contact body 17 and the high-frequency wire 40 is designed as a unidirectional contact body 17. That is, the unit is removed from the electrosurgical resectoscope 10 and disposed of after the surgery. Thus, a new unit can be connected to the electrosurgical resectoscope 10 for subsequent surgeries.

[0075] To perform the intervention, the rod lens assembly 29 is guided through the inner tube 22 or the lens guide mechanism 18. The distal end of the lens assembly 29, not visible here, points to the electrode tool 23 so that the surgeon can visualize the treatment of the tissue. The lens assembly 29 can be a rod lens system or a fiberglass bundle. At the proximal end of the lens assembly 29, such as... Figure 1 The location shown has an eyepiece 30 or a camera.

[0076] The installation of the contact 17 during the manufacture of the support frame 11 has proven to be cumbersome. So far, the process has involved first welding the lens guide plate 20 to the lens guide mechanism 18, then inserting the contact 17 into the lens guide mechanism 18, and finally securing the lens guide mechanism 18 distally to the body 13 or inner tube 22. To replace or maintain the contact 17, these steps must be repeated in reverse order.

[0077] The contact 17 shown here has a slot 32 ( Figure 3 The slot 32 extends parallel to the hole 19 from one end side 33 of the contact body 17 to the opposite end side 34. The slot 32 is designed to extend from the outer wall 35 to the hole 19. Figure 3 As a result, the inner cavity of hole 19 is widened.

[0078] exist Figure 3 In the embodiment of the slit 32 shown, it has two parallel sidewalls 36, 37. The distance between the two sidewalls 36, 37, that is, the width of the slit 32, is less than the diameter of the hole 19. It is particularly specified here that the ratio of the width of the slit 32 to the diameter of the hole 19 is between 0.6 and 0.9 mm, preferably between 0.7 and 0.8 mm, and especially 0.76 mm.

[0079] By widening the hole 19 with the help of slit 32, the contact body 17 can be clamped onto the lens guide mechanism 18. For this purpose, the tubular lens guide mechanism 18 is guided into the hole 19 through slit 32. It is conceivable that the outer diameter of the lens guide mechanism 18 or the distance between the two sidewalls 36, 37 may be temporarily deformed or reversibly deformed. Thus, after the contact body 17 is installed, the handle 16, the spring 21, and the electrode tool 23 can be connected to the contact body 17.

[0080] pass Figure 4This illustrates another key feature of the invention. A slotted or wedge-shaped receptacle 41 is designed to engage the second handle 16 to the contact body 17 in a simple and reliable manner. For this purpose, a corresponding support pin of the handle 16 is pressed into the receptacle 41 from above. A slight force can then cause the engagement to disengage. Alternatively, it is conceivable that the contact body 17 has only two holes 31 in which two spring-preloaded support pins of the second handle 16 can be locked in place. Another embodiment, not shown, may specify that the second handle 16 and the contact body 17 are magnetically engaged. This separable engagement between the handle 16 and the contact body 17 allows for a quick and simple connection between the two components.

Claims

1. A contact body (17) for an electrosurgical handheld instrument, said contact body (17) for receiving a scope guide mechanism (18) and connecting at least one electrical contact of an electrode tool (23) of said electrosurgical handheld instrument, characterized in that, A high-frequency wire (40) is provided, which is fixedly connected to the contact body (17) and through which a high-frequency voltage can be applied to the electrode tool (23) via the at least one electrical contact. The high-frequency wire (40) is connected to two sockets to accommodate one contact of the electrode tool (23) respectively, and the two sockets are integrated into the contact body (17). A slit (32) is provided, which is parallel to a through hole (31) for accommodating the lens guide mechanism (18) passing through the contact body (17) and oriented parallel to the longitudinal axis of the contact body (17). The slit (32) extends from the outer wall (35) of the contact body (17) to the hole (31). The tubular lens guide mechanism (18) can be pressed into the hole (31) through the slit (32). The contact body (17) is made of a reversibly deformable material.

2. The contact body (17) for an electrosurgical handheld instrument according to claim 1, characterized in that, It has a separable engagement with at least one component of the handle unit (14) of the handheld device, namely a first handle member (15) and / or a second handle member (16), wherein the contact body (17) has at least one engagement mechanism for the separable engagement.

3. The contact body (17) for an electrosurgical handheld instrument according to claim 2, characterized in that, The engagement mechanism is designed as a receptacle (41) within the contact body (17), and a component of the handle unit (14) engages with the receptacle in a separable manner.

4. The contact body (17) for an electrosurgical handheld instrument according to claim 3, characterized in that, The reservoir (41) is designed as a slit or hole and the second handle (16) can be locked to the reservoir, or the reservoir (41) is designed to be magnetic so as to magnetically engage with the second handle (16).

5. The contact body (17) for an electrosurgical handheld instrument according to claim 3 or 4, characterized in that, The receiving seat (41) is oriented perpendicular to the longitudinal axis of the contact body (17).

6. The contact body (17) for an electrosurgical handheld instrument according to claim 2, characterized in that, The engagement mechanism is designed as a locking element, bayonet engagement, latching connection or other mechanical connection, wherein a detachable connection can be established with the first handle (15) of the electrosurgical handheld instrument via the engagement mechanism.

7. The contact body (17) for an electrosurgical handheld instrument according to claim 1, characterized in that, The tubular lens guide mechanism (18) can be guided into the hole (31) through the slit (32).

8. The contact body (17) for an electrosurgical handheld instrument according to claim 1, characterized in that, The contact body (17) is a slide for an active electrosurgical resection mirror or a passive electrosurgical resection mirror (10).

9. The contact body (17) for an electrosurgical handheld instrument according to claim 1, characterized in that, The contact body (17) is made of plastic or PEEK.

10. The contact body (17) for an electrosurgical handheld instrument according to claim 1, characterized in that, The contact (17) is configured for use with an electrosurgical resection mirror (10).

11. The contact body (17) for an electrosurgical handheld instrument according to claim 3, characterized in that, The engagement mechanism is designed as a receptacle (41) within the contact body (17), wherein the second handle member (16) of the handle unit (14) engages with the receptacle in a separable manner.

12. The contact body (17) for an electrosurgical handheld instrument according to claim 6, characterized in that, The engagement mechanism is located on the distal end of the contact body (17).

13. The contact body (17) for an electrosurgical handheld instrument according to claim 1, characterized in that, The contact (17) is made of PTFE or PFA.

14. An electrosurgical handheld instrument, the electrosurgical handheld instrument having an electrode tool (23) having an electrode (24) at a distal end and at least one electrical contact at a proximal end, the electrosurgical handheld instrument further having a handle unit (14) consisting of a first handle (15) and a second handle (16), a tubular shaft (12) engaged at the proximal end to the first handle (15), a scope guide mechanism (18) for receiving a scope assembly, and a contact body (17), the scope guide mechanism (18) being guideable through the contact body (17), the second handle (16) being fixable by the contact body, and the at least one electrical contact of the electrode tool (23) being lockable and / or electrically contactable in the contact body, characterized in that, The device is provided with a contact body (17) according to any one of claims 1 to 13.

15. The electrosurgical handheld instrument according to claim 14, characterized in that, The electrosurgical handheld instrument is an electrosurgical resectoscope (10).

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