EP3801328A1

EP3801328A1 - Assembly aid tool for securing electrodes in a resectoscope

Info

Publication number: EP3801328A1
Application number: EP19730154.2A
Authority: EP
Inventors: Martin Horn; Hannes Miersch; Christian Brockmann
Original assignee: Olympus Winter and Ibe GmbH
Current assignee: Olympus Winter and Ibe GmbH
Priority date: 2018-06-11
Filing date: 2019-06-11
Publication date: 2021-04-14
Also published as: WO2019238646A1; DE102018113835A1; CN112449583A; JP2021527483A; US20210244463A1

Abstract

The invention relates to an assembly aid tool for positioning a working instrument in a resectoscope for endoscopic surgery. The invention is characterized in that the assembly aid tool (a) has a handle at the distal end region, (b) one or more holding elements for holding a working instrument, and/or (c) contact surfaces at the proximal end region for supporting a working instrument. The invention additionally relates to an assembly aid tool and to a resectoscope which comprises such an assembly aid tool.

Description

Assembly tool for the attachment of electrodes in a resectoscope

background

The invention relates to an assembly tool for positioning a working instrument, preferably an electrode instrument, in a resectoscope of the type mentioned in the preamble of claim 1. In addition, the invention also relates to corresponding assembly aid systems and resectoscopes and methods for using the assembly tool.

Resectoscopes are mainly used in urology for surgical work in the bladder and in the urethra. They are usually used for resection and vaporization of tissue, for example tissue in the lower urinary tract. For this purpose, the resectoscopes comprise a longitudinally displaceable working element (for example an electrode instrument or a knife instrument) which, after insertion of the resectoscope, can be pushed out of the distal end of the shaft tube of the resectoscope with its distal working end into the patient's body. At its distal working end, the electrosurgical working element can comprise an electrosurgical electrode in the form of a loop or plasma button. Examples of such instruments are the OES PRO resectoscopes (Olympus).

Current resectoscopes have an outer shaft diameter of about 26 career (Ch) or more. Since, despite the already relatively small shaft diameter, a not inconsiderable mechanical stress is exerted on the tissue when introducing the shaft sections of such resectoscopes into urethras, which in isolated cases can also lead to strictures in the tissue, efforts are being made To further reduce the diameter of the shafts. Both the diameter of the inner and the outer shaft of the resectoscopes were reduced.

With this reduction in the shaft diameter, it has been shown that the usual electrode and other working instruments can no longer be inserted into the shaft part from the proximal direction, but instead have to be inserted into the inner shaft from the front. When the resectoscope is assembled, the working instruments must therefore be touched by the medical specialist before a medical intervention in their distal end area so that they can be inserted into the inner shaft and positioned there. The sensitive instruments must be gripped relatively firmly in order to be able to lock the working instrument in the transporter. Since there are sensitive, easily bendable sections in this area, such as the sensitive electrode and easily bendable fork tubes in the case of electrode instruments, bends and damage are very easy when handled incorrectly, as a result of which the working instruments are usually unusable. There is therefore a need for an improved assembly process and instruments that support such a process.

description

This object is achieved by an assembly tool with the features of claim 1 and by an assembly aid system with the features of claim 7, a resectoscope with the features of claim 13 and a method for positioning a working instrument with the features of claim 14. The present invention makes make use of an auxiliary tool that is able to protect a working instrument held on it against mechanical stress during insertion into the inner shaft of a resectoscope. At the same time, the use of the assembly tool according to the invention makes it unnecessary to remove the sensitive distal section of a working instrument, e.g. B. an electrode instrument to touch directly.

In a first aspect, the present invention therefore relates to an assembly tool for positioning a working instrument in a resectoscope for endoscopic surgery, characterized in that the assembly tool (a) has a handle part in its distal end region, (b) one or more holding elements for holding one Working instrument and / or (c) has in its proximal end region support surfaces for supporting the working instrument. The auxiliary assembly tool preferably has both the one or more holding elements and the Contact surfaces. More preferably, the holding element or elements are designed to hold the fork tubes of a working instrument.

The assembly tool facilitates assembly for medical professionals, i. H. assembling the resectoscope before a medical intervention. Before the resectoscope is put into operation, the assembly tool is removed and can be disposed of or prepared for subsequent use. In order to facilitate the assembly process, the assembly tool can be designed for single use ("single-use") and can be disposed of accordingly after its use. In this way, the use of contaminated or damaged tools is completely ruled out and the assembly of instruments is maximally simplified.

The assembly tool can be made of different materials. Since the training as a single-use product does not impose any significant requirements on reusability, the auxiliary assembly tool can be made of plastic, for example. It goes without saying that if correspondingly high-quality plastics are used, assembly tools made of plastics can also be designed for repeated use and preparation.

The assembly aid tool can be used as part of an assembly aid system which comprises or consists of an assembly aid tool according to the invention and a working instrument, preferably an electrode instrument. Accordingly, in a second aspect, the invention relates to an assembly aid system for positioning a work instrument in a resectoscope for endoscopic surgery, characterized in that the assembly aid system comprises a work instrument, preferably an electrode instrument, and an assembly aid tool according to the invention. For example, it is conceivable to offer tools pre-assembled in an assembly aid system.

In a third aspect, the invention relates to a resectoscope with an assembly tool according to the invention. The invention

Assembly tools and assembly systems can be used to position a working instrument in such a resectoscope for endoscopic surgery and are accordingly suitable for this use. In the usual embodiment, the resectoscope has a tubular shaft. In addition to this shaft part, the resectoscope for holding and operating comprises a handle system, which usually consists of two handle pieces. That in the invention The auxiliary tool included in the resectoscope is removed before the resectoscope is put into operation.

The assembly aid tool according to the invention has a handle part in its distal end region. This grip part allows the medical specialist to hold the assembly tool with one hand. The handle can be held between the thumb and index finger, for example. Other sections of the auxiliary assembly tool need not be touched during assembly. The working instrument also does not have to be touched during assembly.

Depending on the preferences of the user group, the handle part can be oriented differently relative to a transverse plane of the assembly aid tool. The transverse plane of the auxiliary assembly tool extends in a transverse plane of a resectoscope when the auxiliary assembly tool is inserted into the inner tube of the resectoscope.

The resectoscope shaft usually includes an elongated outer tube (cladding tube). An inner tube for accommodating an optical system and a passage instrument or working instrument is arranged in the interior of the outer tube. According to the invention, the working instrument is preferably an electrode instrument. Alternatively, the working instrument can, for example, also be an instrument with a knife arrangement at the distal end. Mechanical tissue manipulation is possible with such instruments. It is also conceivable that, in addition to the working instrument, further passage instruments are used in the resectoscope.

By separating these working components running within the inner tube from the rest of the interior of the outer tube, the components are protected against mechanical stress. In addition, it is contemplated to make the inner tube rotatable about its longitudinal axis in the usual manner. By rotating the inner tube, the optics and working instrument can be brought into a working position more precisely at the point of intervention and, if necessary, rotated. The inner tube is therefore preferably rotatably mounted in the cladding tube. In addition, the space between the outer and inner tubes can be used to discharge a rinsing liquid that is directed into the inside of the body to improve the view. In a spatial orientation, a resectoscope can be divided into different areas by a transverse plane that intersects the shaft tube in the longitudinal direction and horizontally and a sagittal plane that is perpendicular to the transverse plane, the longitudinal axis of a shaft tube lying both in the sagittal plane and in the transverse plane. The transverse plane cuts the shaft tube transversely and in a position of use of the resectoscope in a horizontal orientation and the sagittal plane cuts the shaft tube vertically and in a position of use of the resectoscope in a vertical orientation. The sagittal plane can in particular lie parallel to a movement plane which is described in the case of a relative movement of, for example for the actuation of a slide of the resectoscope, pivotally mounted handle parts on the resectoscope.

In a particularly preferred embodiment, the grip part extends in or parallel to a transverse plane of the resectoscope, i.e. in or parallel to a transverse plane of the assembly tool. With this design, the handle part can not only be used to hold the auxiliary assembly tool, but also protects the one below or above it - i.e. in a parallel transverse plane - lying electrode or knife arrangement from damage. This is advantageous for all types of working instruments that can be used, but especially for sensitive electrode instruments that are preferred according to the invention, in particular those that comprise a loop electrode.

The preferred extension of the grip part in or parallel to a transverse plane does not preclude the grip part from being ergonomically adapted to the holder by human fingers and, for this purpose, for example having a curvature in the upper and / or lower grip surface. It is also contemplated that the handle part from the transverse plane is light, i.e. to be inclined and / or curved at an angle of less than 30 °, preferably less than 20 °.

As indicated, the grip part can have a grip surface on opposite sides for holding by two fingers, i. H. one lower and one upper grip surface during regular operation of the assembly tool.

The auxiliary assembly tool also has one or more holding elements for holding a working instrument, for example for holding fork tubes of an electrode instrument, and in its proximal end region there are support surfaces for supporting the working instrument. While the holding elements mainly the Serve stabilization of the assembly aid system, the force required to lock the working instrument in the transporter is transmitted via the contact surfaces of the assembly aid tool.

According to the invention, the holding elements can hold the working instrument at any point. However, it is preferred that the holding elements hold the working instrument in the region of its shaft part. As used herein, the holder or holder is to be understood in the sense of fastening, in particular in the sense of a releasable fastening. The attachment can preferably be released by a simple pulling movement. It is therefore preferred that the holding elements are releasably attachable to the shaft part of the working instrument.

The working tools used can have two fork tubes. Such a structure is known in particular for electrode instruments. These fork tubes run in the proximal and middle shaft area of the working instrument, e.g. B. electrode instruments, relatively close to each other and only diverge in the distal end region of the working instrument, so that the distal ends of the fork tubes are a working element, e.g. B. an electrode, for example in the form of a loop electrode or a plasma button, between them. The holding elements are preferably for holding fork tubes of a working instrument, i.e. trained to hold a working instrument on his fork tubes.

The assembly tool preferably extends with its own shaft part from the distal grip part to the proximal contact surfaces. The shaft part can have a part-circular cross section. In this way, the auxiliary assembly tool can be inserted into the inner shaft of a resectoscope without being hindered by existing components inside the inner tube. One or more holding elements of the assembly tool are used to fasten the assembly tool to the working instrument, in particular to hold and stabilize the fork tubes.

The holding elements are fastened or formed on the shaft part of the assembly auxiliary tool. The holding elements are preferably arranged laterally on the shaft part of the assembly auxiliary tool such that they can contact and hold the shaft part of the working instrument, in particular the fork tubes of a working instrument, in its or its distal end region. For this purpose, the holding elements are at least partially complementary in shape to the shaft part or to one or both Fork tubes trained. In preferred embodiments, the auxiliary assembly tool has two holding elements, which are each designed and arranged to hold one of the fork tubes of a working instrument.

The holding elements can be designed, for example, as clamping elements. To hold the shaft part, in particular to hold one of the fork tubes in each case, the clamping elements can have a part-circular cross-section, the curvature of the inner surface of the partial circle essentially corresponding to the curvature of the outer surface of the shaft part or of a fork tube. It is conceivable to use clamping elements which have a semicircular or three-quarter circular cross-section, but it has been shown that a smaller part-circular cross-section is also sufficient. For example, the clamping element can have an arc length with a center angle of 45 ° to 360 °, preferably of 60 ° to 120 °. The part-circular cross section of the clamping elements each has at least one opening through which the shaft part or a fork tube can be inserted laterally into the clamping element. If the opening is smaller than the diameter of the shaft part or the fork tube, the clamping element has sufficient flexibility for the short-term, sufficient enlargement of the opening. In one embodiment, the clamping elements have the function of a snap lock.

Alternatively, the holding elements can completely enclose the shaft part or a fork tube in each case. The shape of the holding element essentially corresponds to that of the clamping elements described above. However, the holding elements have no opening through which the shaft part or the fork tubes are inserted laterally. Instead, the connection of these holding elements to the assembly tool each has a predetermined breaking point. In this way, after the successful insertion of the working instrument into the resectoscope, the auxiliary assembly tool can be detached from the working instrument by breaking the predetermined breaking points. In this embodiment, the holding elements remain on the working instrument after the removal of the auxiliary assembly tool. Such holding elements can be produced, for example, by overmolding the shaft part or the fork tubes.

It is preferred that the assembly aid tool extends substantially parallel to the electrode instrument if both instruments are connected to form an assembly aid system. The auxiliary assembly tool then extends in a transverse plane that is parallel to a transverse plane of the electrode instrument. The transverse plane in which the distal end region of the fork tubes of the electrode instrument extends is to be referred to herein as the fork tube plane.

The clamping elements can hold the shaft part or the fork tubes from different directions, for example from the direction of the transverse plane in which the auxiliary assembly tool extends and / or from the fork tube plane. In the latter case, the clamping elements can be arranged radially next to the fork tubes of a working instrument. In the respective direction, the clamping elements enclose the fork tubes in a partial circle. For example, the auxiliary assembly tool can have two clamping elements, each of which grips the fork tubes from outside or from inside the space arranged between the distal end regions of the fork tubes. It is particularly preferred that the auxiliary assembly tool comprises two clamping elements with a part-circular cross-section, which in each case encompass the fork tubes in part-circular fashion in their distal end region from within the intermediate space. It has been shown that such an arrangement, on the one hand, provides a sufficiently firm hold and, on the other hand, also allows the auxiliary assembly tool to be released quickly if the working instrument is locked within the resectoscope. Depending on the type of working instrument used, a wrap-around from outside the space can also be advantageous. For example, when using an electrode instrument that has button or needle electrodes, it is advantageous if the auxiliary assembly tool comprises two clamping elements with a part-circular cross-section, which in each case encompass the fork tubes in part-circular fashion from outside the intermediate space in their distal end region.

The fork tubes of conventional electrode instruments have an insulation section in their distal end region, which can comprise, for example, an insulation element made of an electrically insulating material. Suitable materials are known to those skilled in the art and include, for example, ceramics. The insulation elements can thicken the fork tubes in the insulation section.

The clamping elements in the assembled assembly aid system preferably hold the fork tubes of the electrode instrument proximal to the insulation sections, the insulation sections having a larger cross-sectional diameter in comparison to the average diameter of the respective fork tube in its distal end region outside the insulation sections. The arrangement of the clamping elements proximal to these insulation sections facilitates the handling of the Assembly aid system, since slipping of the assembly aid tool in the distal direction is prevented by the insulation sections.

The required pull-off force for separating the assembly auxiliary tool and the working instrument is preferably smaller than the required pull-off force for separating the working instrument and the resectoscope or transporter. In this way it is ensured that after the working instrument has snapped into the resectoscope or transporter, the assembly aid tool can be released from the working instrument without separating the working instrument from the resectoscope or transporter again.

At the same time, it is preferred that the pull-off force required to separate the assembly auxiliary tool and the working instrument is greater than the pull-out force required to separate the unlocked working instrument from the resectoscope or transporter. This ensures that the auxiliary assembly tool and the working instrument are only separated by applying a tensile force when the working instrument is fully engaged in the resectoscope or transporter. Among other things, the arrangement of the holding elements proximal to insulation sections can help to set the desired pull-off force.

In its proximal end region, the assembly aid tool has support surfaces for supporting the working instrument. The contact surfaces serve to support the working instrument from a distal direction. Correspondingly, the contact surfaces in the assembled assembly aid system are arranged distally from the section of the working instrument to be supported. According to the invention, the support surfaces for support, i.e. for contacting, the working instrument on its fork tubes, its shaft part, guide plates or other sections. The contact surfaces are preferably designed for contacting guide plates of the working instrument. Working instruments, in particular electrode instruments, often have one or more guide plates, which together form a part-cylindrical shape for receiving the optics. The guide plates are designed and arranged to complement the outer wall of the optics. The elongated optic of a resectoscope runs between the guide plates of the working instrument, e.g. B. the electrode instrument.

According to the invention, the auxiliary assembly tool is by means of its contact surfaces on the distal end of the guide plates or on other parts of the working instrument supported so that a force in the proximal direction can be exerted on the working instrument to lock it in the resectoscope by means of the assembly aid tool.

Preferably, the support surfaces are arranged at the proximal end of the auxiliary assembly tool, i. H. the contact surfaces form the proximal end of the auxiliary assembly tool. In order to be able to exert a force in the proximal direction on the guide plates or other sections of the working instrument, it is advantageous for the contact surfaces to extend transversely to the longitudinal axis of the auxiliary assembly tool. The sections of the working instrument on which the bearing surfaces are supported also preferably have supporting surfaces which extend essentially transversely to the longitudinal axis of the working instrument. The contact surfaces can be complementary in shape and size to the distal end of the guide plates or the support surfaces of the working instrument or sections thereof. It is also conceivable that the support surfaces project radially in one or more directions beyond the distal end of the guide plates or support surfaces. In this way, even with slight radial displacements, a safe application of force is ensured by the auxiliary assembly tool and the locking of the working instrument. According to the invention, it is always ensured that the contact surfaces in the proximal end region of the assembly aid tool in the assembled assembly aid system lie at least in sections on the distal end of one or more guide plates or support surfaces of the working instrument.

It is conceivable to design the contact surfaces on the holding elements used according to the invention. In this embodiment, for example, the proximal end of the holding elements in the assembled state of the assembly aid system could be in adjacent contact with a section of the working instrument (support surface or guide plates). The holding elements can be used in this way to exert force on the working instrument from a distal direction.

In a further aspect, the invention relates to a method for positioning a working instrument, preferably an electrode instrument, on a resectoscope, which comprises steps in which (a) a working instrument is positioned in the shaft part of the resectoscope by means of an assembly tool according to the invention; (b) detaching the assembly tool from the working tool; and (c) removing the assembly tool from the resectoscope. The positioning of the working instrument comprises the insertion in a correct orientation and preferably also the locking of the working instrument in the resectoscope, preferably in the transporter of the resectoscope.

The assembly auxiliary tool can be detached from the working instrument by a slight movement of the auxiliary tool transversely or essentially transversely to the fork tube plane. Due to the preferred partially circular design of the holding elements or the design of the holding elements with predetermined breaking points, no great force is required for this. The locking of the working instrument is therefore not affected by the loosening of the auxiliary assembly tool. As described above, in addition, impairment of the locking of the working instrument is preferably prevented in that the pulling force for separating the auxiliary assembly tool and working tool is smaller than the pulling force for separating the working instrument and the resectoscope or transporter locked in the resectoscope or transporter.

After the auxiliary tool has been released from the working instrument, the auxiliary assembly tool can simply be removed from the shaft of the resectoscope and disposed of or processed.

Brief description of the figures

Exemplary embodiments of the invention are shown schematically in the drawings. Show it:

Figure 1 is a schematic side view of a resectoscope.

2 shows a schematic side view of an assembly aid system according to the invention;

3 shows a schematic, perspective view of a section of an assembly aid system according to the invention;

Fig. 4 is a schematic, perspective view of a portion of an assembly aid system according to the invention in the inner tube of a

Resectoscope is introduced;

FIG. 5 shows a further schematic, perspective view of a section of the assembly aid system according to the invention from FIG. 3; and FIG. 6 shows a further schematic, perspective view of a section of the assembly aid system according to the invention from FIG. 4, the

Assembly aid system is inserted into the inner tube of a resectoscope.

embodiments

Further advantages, characteristics and features of the present invention will become clear in the following detailed description of exemplary embodiments with reference to the attached drawings. However, the invention is not restricted to these exemplary embodiments.

1 shows a highly schematic side view of a resectoscope 14 from the prior art. The assembly tool 10 according to the invention can be used to insert a working instrument 11 into the resectoscope 14. The working instrument 11 is designed here as an electrode instrument 12. The assembly aid system 26 is inserted in particular from the distal end of the shaft part 32 of the resectoscope 14. In the resectoscope 14 shown, the electrode instrument 12 has already been inserted into the resectoscope 14 and locked there. It can be seen that the electrode instrument 12 has a loop electrode 30 which is held by fork tubes 20. The fork tubes 20 are connected to the optics 42 by means of guide plates 24. Tissue can be removed by means of the loop electrode 30 by electrosurgical ablation. Here, a high-frequency electrical voltage is applied to the loop electrode 30 in order to cut tissue.

Within the shaft area 32 of the resectoscope, the optics 42 and the electrode instrument 12 run within an inner tube 50, which can be rotatably mounted, for example, with respect to the outer tube 52. An embodiment is shown in which the electrode instrument 12 and the optics 42 protrude slightly beyond the distal end of the outer tube 52. In this regard, however, a large number of variations are conceivable. The inner tube 50 can, as shown, be made somewhat shorter than the outer tube 52 or the same length or longer. A space between the inner tube 50 and the outer tube 52 can serve as a return space for rinsing and / or body fluids.

An eyepiece or alternatively a camera for displaying the treatment area can be arranged at the proximal end of the optics 42. At the distal end of optics 42 it has, for example, a lens, not shown, which is directed towards the area to be operated. An electronic sensor, such as a CCD chip, can also be assigned to the optics 42.

The resectoscope 14 shown has a passive transporter, in which the slide 54 is displaced in the distal direction against the distal, first handle piece 34 by a relative movement of the handle pieces 34 and 36 arranged proximally from the shaft part 32 against a spring force applied by a spring bridge 38. When the slide 54 is displaced in the distal direction against the grip piece 34, the electrode instrument 12 and / or the optics 42 are positively guided to the distal in a manner not shown. When the handle pieces 34, 36 are relieved, the spring force generated by the spring bridge 38 forces the slide 54 back into its rest position, the shaft part 32 and thus also the electrode instrument 12 and / or the optics 42 being pulled in the proximal direction. When the carriage 54 is pushed back, an electrosurgical intervention with the electrode instrument 12 can be carried out without manual force from the surgeon, that is to say passively.

FIG. 2 shows a schematic side view of an assembly aid system 26 according to the invention, in which an assembly aid tool 10, shown hatched, is connected to an electrode instrument 12. The connection between the auxiliary assembly tool 10 and the electrode instrument 12 takes place via clamping elements 18 (not shown in this figure) and the contact surfaces 22 adjoining the distal end of the guide plates 24.

As can also be seen in FIGS. 3 and 5, the assembly aid tool 10 is elongated with a shaft part 46 and has a handle part 16 which is anatomically designed for holding between two fingers at its distal end. The shaft part 46 has a part-circular cross section, with which it is optimally adapted to the curves in the inner tube 50. The electrode instrument 12 has fork tubes 20 which merge into a fork tube plane G in their distal end region.

3 to 6 each show one section of the assembly aid system 26 according to the invention, the system in FIGS. 4 and 6 being inserted into the inner tube 50 of a resectoscope 14. To simplify the illustration, the outer tube 54 of the resectoscope 14 is not shown in these figures. 3 and 4 show a representation of an embodiment of the assembly aid system 26 according to the invention from a different perspective than FIGS. 5 and 6. Like the assembly aid system 26 shown in FIG. 2, the embodiment of FIGS. 3 to 6 has an assembly aid tool 10 which is connected to an electrode instrument 12. In its distal end region, the assembly aid tool 10 comprises an ergonomically shaped grip part 16, on which the assembly aid system 26 can be gripped. The assembly aid system 26 can be held securely between two or more fingers by means of this grip part 16. It is not necessary to touch the system at other points. In this way, the risk of damage to the electrode instrument 12 is significantly reduced.

The assembly tool 10 also has an elongated sheep part 46, on the side of which two holding elements 17 are arranged, of which only one is visible in the figures shown. The holding elements 17 are designed as clamping elements 18. The clamping elements 18 are partially complementary to the fork tubes 20 and can hold these fork tubes 20 by clamping. Alternatively, it is also conceivable to design the holding elements 17 such that they hold the working instrument 11 on another section of its shaft part.

Two contact surfaces 22 are formed on the proximal end of the auxiliary assembly tool 10 in the direction of the distal end of the electrode instrument 12. The support surfaces 22 are partially complementary to the distal end of the guide plates 24 of the electrode instrument 12. As a result, a sufficient force can be exerted on the guide plates 24 from the distal direction by means of the auxiliary assembly tool 10.

The guide plates 24 together form a shape with a cross section that is partially circular in the longitudinal direction of the electrode instrument. In this form, as can be seen in FIG. 6, the optics 42 can be accommodated. The assembly aid system 26 is designed in such a way that the optics 42 can be passed between the assembly aid tool 10 and the guide plates 24 and between the two fork tubes 20.

The electrode instrument 12 also has two fork tubes 20 which extend essentially over the entire length of the electrode instrument 12. The fork tubes 20 lie close together in the proximal and central region of the shaft part 32 and are then separated in the distal region of the shaft part 32 in the manner shown in FIGS. 3 to 6 and on the opposite side of the Inner shaft 50 led. As a result, the electrode at the distal end of the electrode instrument 12, which is designed here as a loop electrode 30, is arranged in a space-saving manner inside the inner tube 50 in front of the optics 42 after insertion into an inner tube 50. Before and during the insertion and positioning of the assembly aid system 26, the electrode is also protected from damage by the handle part 16 lying above it, ie in a parallel transverse plane.

The clamping elements 18 are positioned on the shaft part 46 of the auxiliary assembly tool 10 in such a way that they are arranged in an assembled auxiliary assembly system 26 proximal to those which are usually at the distal end region of fork tubes 20

Isolation sections 28 lie. In this way, the auxiliary assembly tool 10 is prevented from slipping off from the electrode instrument 12 during insertion. Although the present invention has been described in detail with reference to the exemplary embodiments, it is self-evident to the person skilled in the art that the invention is not restricted to these exemplary embodiments, but rather that modifications are possible in such a way that individual features are omitted or other combinations of the individual features presented are realized can, provided that the scope of protection of the appended claims is not left. The present

Disclosure includes all combinations of the individual features presented.

LIST OF REFERENCE NUMBERS

Assembly aid tool 48 distal end region of working instrument 50 inner tube

Electrode instrument 52 outer tube resectoscope 54 slide

Handle part G fork tube level holding element

clamping element

fork tube

bearing surface

guide plate

Assembly aid system

insulating section

loop electrode

Resectoscope shaft part

first handle

second handle

spring bridge

eyepiece

optics

Electrode instrument shaft element

Shank part assembly tool

Claims

claims

1. assembly tool (10) for positioning a working instrument (1 1) in a resectoscope (14) for endoscopic surgery, characterized in that the assembly tool (10)

(a) a handle part (16) in its distal end region,

(b) one or more holding elements (17) for holding a working instrument (11), preferably fork tubes (20) of a working instrument (11), and / or

(c) in its proximal end region support surfaces (22) for supporting a working instrument (11)

having.

2. Auxiliary tool (10) according to claim 1, characterized in that the auxiliary tool (10) is suitable for positioning an electrode instrument (12).

3. Assembly tool (10) according to one of claims 1 to 2, characterized in that the bearing surfaces (22) for contacting guide plates (24) of an electrode instrument (12) are formed.

4. assembly tool (10) according to any one of the preceding claims, characterized in that the holding elements (17) are designed as clamping elements (18).

5. assembly tool (10) according to any one of the preceding claims, characterized in that the assembly tool (10) is made of a plastic.

6. Auxiliary tool (10) according to one of the preceding claims, characterized in that the bearing surfaces (22) form the proximal end of the auxiliary tool (10).

7. assembly aid system (26) for the positioning of a working instrument (1 1) in a resectoscope (14) for endoscopic surgery, characterized in that the assembly aid system (26) is a working instrument (1 1) and an assembly aid tool (10) according to one of the claims 1 to 6 comprises.

8. assembly aid system (26) according to claim 7, characterized in that the working instrument (1 1) is an electrode instrument (12).

9. assembly aid system (26) according to claim 8, characterized in that the electrode instrument (12) comprises two fork tubes (20) which are held by the holding element or elements (17), preferably clamping elements (18), of the assembly aid tool (10).

10. Assembly aid system (26) according to claim 9, characterized in that the fork tubes (20) have an insulation section (28) in their distal end region and the holding elements (17) of the assembly aid tool (10) each have the fork tubes (20) proximal to the insulation sections ( 28) hold.

1 1. assembly aid system (26) according to one of claims 8 to 10, characterized in that the bearing surfaces (22) in the proximal end region of the assembly aid tool (10) at least in sections on the distal end of one or more guide plates (24) of the electrode instrument (12 ) lie on.

12. assembly aid system (26) according to any one of claims 8 to 1 1, characterized in that the electrode instrument (12) comprises a loop electrode (30).

13. resectoscope (14) with assembly tool (10) according to one of claims 1 to 6.

14. A method for positioning a working instrument (1 1) on a resectoscope (14), which comprises steps in which one

(a) a working instrument (11) is positioned in the shaft part (32) of the resectoscope (14) by means of an auxiliary assembly tool (10) according to one of claims 1 to 6;

(b) detaching the assembly tool (10) from the working instrument (11); and

(c) the assembly tool (10) is removed from the resectoscope (14).