Electrosurgical handpiece and proximal, intermediate and distal sections of its body

Abstract

The invention relates to an electrosurgical hand instrument and to proximal, intermediate and distal sections of the body of the same. The electrosurgical hand instrument is primarily used for endoscopic applications in urology or gynaecology. However, the field of application of the instrument is not limited to this area of the human body, but also includes the treatment of other organs in the lower abdomen. The invention provides an electrosurgical hand instrument and a handle, a body and an adapter joint which can be produced simply and inexpensively, while ensuring laminar flow of the irrigation fluid at the distal end of the hand instrument. This is achieved in that the through passage through the handle is funnel-shaped, wherein the cross section of the through passage narrows from the distal side towards the proximal side of the handle.

Description

Technical Field

[0001] This invention relates to a middle section, particularly a handle, for an electrosurgical handheld instrument. The invention also relates to a distal section, particularly a body, for an electrosurgical handheld instrument. Furthermore, the invention relates to a proximal section, particularly an adapter, for an electrosurgical handheld instrument. Finally, the invention relates to an electrosurgical handheld instrument and an electrosurgical handheld instrument. Background Technology

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

[0003] The instruments of this type, such as electrosurgical resectoscopes, are typically equipped with a support frame and a long, thin tubular rod. For the treatment of diseased tissue, the rod is guided into the patient's body through an opening. Various medical instruments can be arranged within the rod tube for the treatment and / or examination of the patient. For example, for high-frequency surgery, electrodes capable of withstanding high-frequency alternating current can be passed through the rod, located at the distal end of the electrode tool. To treat or cut tissue, the electrode tool, along with the electrodes, is movable relative to the rod tube and along the rod axis, thereby treating the tissue by the movement of the electrodes along or through the tissue.

[0004] Furthermore, the electrode tool is connected to the carrier frame at its proximal end. The operation of the carrier frame allows for electrode cutting motion. The carrier frame has a movable contact body, also known as a slide. On this contact body, the electrode tool can be detachably mechanically connected to electrical contacts. Through this mechanical connection, electrical power can also be supplied to the electrode tool or electrode. The contact body has an opening for this purpose, into which the electrical contacts of the electrode frame can be inserted for detachable connection. This opening is designed to allow the application of a high-frequency voltage through an adjacent socket. For this purpose, a plug is typically inserted into the socket, which is then connected to a high-frequency generator via a wire or cable.

[0005] The operation or longitudinal feeding of the support frame, including the electrodes, is performed by the surgeon. For this purpose, the support frame is equipped with a handle unit with a grip and a holding element. The surgeon grasps the handle and holding element, which is designed as a finger unit or thumb ring, to operate the support frame. The handle is fixed to the stationary body or contact element of the support frame.

[0006] The support frame moves against the spring tension, which is typically designed as a leaf spring or disc spring in this type of support frame. One end of the spring is fixed to the contact body or slide, and the other end is fixed to the end piece of the reinforcing tube or the optical guide plate. The type of spring or the mode of operation of the spring mechanism 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, while in the case of a passive support frame, it is designed as a tension spring. The reinforcing tube is preferably detachably fixed to the handle via an adapter.

[0007] Typically, electrode cutting is performed by the pull-back motion of the support frame. In the case of an active support frame, the electrode is pulled back (proximal) against the spring force. In the case of 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 return motion (proximal) caused by the unloading of the spring.

[0008] Additionally, an optical device may be guided through the rod of the instrument described herein. An embodiment is known in which the optical device, as a rod-lens system or glass fiber, is guided from the proximal end through the rod to the distal end. The distal end of the optical device is directly aligned with the surgical area or electrode application site. At the proximal end of the optical device, the surgeon can observe the treatment through an eyepiece or camera.

[0009] The electrode tool has two parallel electrode arms oriented parallel to the rod axis. Electrodes are mounted on the two distal ends of the electrode arms, while the two proximal ends of the electrode arms can be inserted into a contact body for mechanical and electrical contact. For this purpose, the two proximal ends of the electrode arms are guided from the distal direction along the rod through the body, handle, and adapter.

[0010] To guide the contact point or proximal end of the electrode arm away from the optics and to provide structural space for sealing the various through channels, the tubular electrode arm has a versatz. This versatz is designed as an S-bend and forms a stepped retraction of the distal section of the electrode arm relative to the proximal section. It is also known to implement two parallel electrode arms converging into a single electrode rod in the proximal direction. Here, the S-bend is located precisely within the transition zone between the two electrode arms and the electrode rod. For construction reasons, the versatz is typically located in the distal region of the electrode tool. However, this results in two or one versatz being located in the flow of flushing fluid from the proximal end of the instrument toward the treatment site. This causes significant flow disturbance, potentially preventing laminar flow of flushing fluid within the optics' observation area. However, moving the S-bend proximally into the body is complex and costly. This is especially true because the space around the optics and in front of the body in the distal direction is very limited. Known electrode rods are therefore flexibly constructed to deflect into the body. Summary of the Invention

[0011] In view of this, the present invention aims to provide an electrosurgical handheld instrument, as well as a handle, a body and an adapter, which can be manufactured particularly simply and inexpensively while ensuring laminar flow of irrigation fluid at the distal end of the handheld instrument.

[0012] One solution to this problem is described by the features of the first aspect of the invention. Therefore, it is specified that the middle section of the body of an electrosurgical handheld instrument, which may be, for example, an electrosurgical resectoscope, and especially the handle, can be detachably connected distally to the distal section of the body, especially the main body, and proximally to the proximal section of the body, especially the adapter. The distal, middle, and proximal sections here form parts of the carrier body, and they can be combined such that they form the body. The distal section can then be designed as the main body, the middle section as the handle, and the proximal section as the adapter, or as described above.

[0013] The intermediate section has an axial hole through which a rod-shaped component of the handheld device, such as an optical element, can be inserted. Parallel to this axial hole, the intermediate section has at least one through-channel for the electrode arm of an electrode tool of the handheld device to pass through. The intermediate section or handle is characterized by a funnel-shaped through-channel, wherein the cross-section of the through-channel narrows from the distal to the proximal side of the intermediate section. Due to the funnel-shaped design of the through-channel, at least one electrode arm of the electrode tool can easily pass through the through-channel of the intermediate section.

[0014] Specifically, it is specified that the first cross-section of the through-channel on the distal side will be designed as an ellipse, and the second cross-section of the through-channel on the proximal side will be designed as a circle. This optimized design of the through-channel in the middle section allows for easy integration with other components of the handheld device.

[0015] The present invention preferably specifies that the first cross-section continuously transitions to the second cross-section of the through-channel in the intermediate section, and in particular, the elliptical cross-section of the through-channel continuously transitions to the circular cross-section of the through-channel. Through this continuous transition, i.e., stepless transition, the end of the electrode arm can easily and effectively pass through the through-channel of the intermediate section or handle. Therefore, the end of the electrode arm is guided from the side with the larger cross-section to the side with the smaller cross-section via the through-channel.

[0016] The invention may also specify that a principal axis of the elliptical cross-section of the through-channel is vertically oriented, and a secondary axis of the elliptical first cross-section of the through-channel is horizontally oriented. It is also possible that these axes are oriented in other ways. However, it has been shown that the orientation of the axes claimed here is particularly advantageous, especially in conjunction with the body of the handheld device. The arrangement of the vertical principal axis is particularly advantageous in embodiments with two through-channels. In the case of a vertical orientation, the principal axes of the two through-channels are parallel. This orientation allows the two electrode arms to be misaligned in the same spatial direction, which positively impacts the cost of the electrode tool.

[0017] A particularly advantageous embodiment of the invention may specify that the intermediate section has two through channels for passing through an electrode arm of the electrode tool of the handheld device, respectively. Here, the two through channels are designed as described above. The two through channels are designed in a funnel shape and are parallel to each other and parallel to the axial hole orientation of the intermediate section.

[0018] The central section of the handheld instrument or electrosurgical resectoscope, where protection is required, is designed as an injection-molded part. Therefore, this section is manufactured from plastic using known injection molding methods. This arrangement is particularly advantageous because the funnel-shaped design of the through-channel, in particular, can only be achieved with difficulty or high cost using other manufacturing methods or materials.

[0019] Another solution to the aforementioned task is claimed through a distal segment, particularly the body, of a body according to the invention. Therefore, this distal segment is distally, preferably detachably or fixedly connected, particularly welded to, a tubular rod, and proximally detachably connectable to an intermediate segment according to the invention. The distal segment has an axial opening or hole for passing through or accommodating a rod-shaped component of the handheld device. Parallel to the axial opening, the distal segment has at least one through-channel for the electrode arm of an electrode tool of the handheld device to pass through.

[0020] The distal segment or body is characterized by the at least one through-channel having an elliptical or elongated cross-section. This elliptical or elongated design of the through-channel advantageously accommodates the electrode arm. It is particularly advantageous for the electrode arm to be inserted movably within the vertically enlarged through-channel, especially when its cross-sectional shape is not tubular or circular and, for example, misaligned.

[0021] Preferably, one principal axis of the elliptical cross-section of the through-channel is vertically oriented, and a secondary axis of the elliptical cross-section is horizontally oriented. Therefore, the cross-section of the through-channel in the distal segment substantially corresponds to the distal cross-section of the through-channel in the middle segment.

[0022] A particularly advantageous embodiment of the distal section specifies that two through channels, through which each electrode arm of the electrode tool for the handheld instrument passes, extend parallel to each other and parallel to the axial opening through the distal section or body. The two through channels also have the aforementioned elliptical or elongated cross-section. The distal section is designed to accommodate an electrode tool with two electrode arms. This through-channel design allows the two arms of the electrode tool to advantageously move back and forth along one axis of the instrument.

[0023] Furthermore, it is conceivable that the opening and at least one through-passage through the distal segment are designed as the same opening, i.e., the respective areas intersect each other, or rather, are not separated by walls.

[0024] The present invention describes a proximal segment of a body, particularly an adapter, to accomplish the aforementioned tasks. The proximal segment, for use with an electrosurgical handheld instrument or electrosurgical resectoscope, is detachably connected distally to an intermediate segment according to a first aspect of the invention. Proximally, the proximal segment is connected to a tubular rod. This rod may be designed, for example, to accommodate other components of the handheld instrument, such as optics. The rod may also be referred to as a reinforcing tube or an optical guide mechanism. The adapter also has an axial bore for accommodating the rod-shaped component of the handheld instrument. Parallel to the axial bore, the proximal segment also has at least one through-channel for an electrode arm of an electrode tool to pass through. A characteristic feature of the proximal segment is that the at least one through-channel has a circular cross-section. The circular cross-section corresponds to the proximal cross-section of the through-channel of the intermediate segment or handle.

[0025] Another feature of the proximal section may be that the at least one through-channel has a seal, preferably a fluid seal, integrated into the proximal section or adapter. It is conceivable that flushing fluid will pass through the through-channel when using a handheld instrument. Because the through-channel is designed to accommodate the electrical contacts of the electrode tool, a risk of electrical short circuit is avoided. The seal claimed herein protects against, in particular, conductive liquids, from passing through the through-channel of the proximal section.

[0026] It is also conceivable that the proximal segment or adapter is characterized by having two through channels, each designed to accommodate an electrode arm of the electrode tool. The two through channels have circular cross-sections and are parallel to each other and parallel to the axial hole orientation. This symmetrical structure allows for simple and reliable arrangement of the operation of the proximal segment and other components of the handheld device.

[0027] Another solution to the aforementioned task is described by the features of the invention. Thus, an electrosurgical handheld instrument according to the invention, for example, may be an electrosurgical resectoscope, comprising an electrode tool and, according to the first aspect of the invention, a middle section of the body, particularly a handle; a distal section of the body, particularly the main body; and a proximal section of the body, particularly an adapter. Therefore, the body consists of or may consist of three sections. Here, the distal side of the proximal section is detachably connected to the proximal side of the middle section, and the distal side of the middle section is detachably connected to the proximal side of the distal section. All of the sections or components of the handheld instrument have an axial hole and / or opening. In the connected state, the holes or openings of these sections or components overlap and, for example, are used to accommodate a tubular rod.

[0028] Furthermore, the distal, intermediate, and proximal sections each have at least one through-channel parallel to the axial hole or opening, which also intersect each other and serve to accommodate an electrode arm of the electrode tool. The handheld device is characterized in that the first cross-section of the funnel-shaped through-channel of the intermediate section, particularly the handle, on the distal side of the intermediate section is similar, in particular, identical, to the elliptical or elongated cross-section of the through-channel of the distal section or body. The second cross-section of the funnel-shaped through-channel of the intermediate section on the proximal side of the intermediate section is identical to the circular cross-section of the through-channel of the proximal section or the adapting structure. In the connected state of these three sections or components, the through-channels of the distal, intermediate, and proximal sections overlap to form an electrode arm guide mechanism. Viewed from the distal direction, the elliptical elongated through-channel of the distal section continuously transitions through the intermediate section into a through-channel with a circular diameter, wherein this diameter is smaller than the diameter of the through-channel of the distal section.

[0029] An alternative solution to the aforementioned task is described by the features of the present invention. Therefore, the electrosurgical handheld instrument according to the invention, particularly an electrosurgical resectoscope, has an electrode tool and a body. This body has three sections: a distal section, a proximal section, and a middle section. These sections have a common axial bore for receiving optics and, parallel to it, at least one through-channel for the electrode arm of the electrode tool to pass through. The at least one through-channel is composed of three channel portions, wherein the first cross-section of the channel portion passing through the distal section is designed to be elliptical or elongated, the third cross-section of the channel portion passing through the proximal section is designed to be circular, and the second cross-section of the channel portion passing through the middle section is designed to be funnel-shaped, wherein the funnel-shaped cross-section changes continuously from the first cross-section to the third cross-section. These three sections together form the integral body.

[0030] The present invention preferably specifies that the distal, intermediate, and proximal sections have two through channels that are parallel to each other and oriented parallel to the axial bore, and are used to accommodate the two electrode arms of the electrode tool. Thus, these through channels of the sections or components provide two parallel electrode arm guide mechanisms designed for simple accommodation of the proximal ends of the electrode arms. In particular, through the elongated design of the through channel in the distal section and the funnel-shaped through channel in the intermediate section or handle, the proximal ends of the electrode arms can be advantageously connected to the handheld device both mechanically and electrically.

[0031] Another advantageous embodiment of the invention may specify that at least one electrode arm of the electrode tool has a misalignment. The misalignment can be formed as a stepped transition between proximal and distal regions of the electrode arm, wherein these two regions extend parallel to each other. This misalignment can be particularly designed as an S-bend, and for this purpose serves to guide the proximal end of the electrode arm, designed as an electrical contact, away from the axial hole.

[0032] Furthermore, a preferred feature of the handheld device is that at least one through-channel or channel portion with an elliptical or elongated cross-section is designed in such a way that the electrode arm can move back and forth in the proximal and distal directions within the through-channel or within the channel portion. The distal region of the electrode arm is straight, so that the flow performance of the rinsing fluid is not disturbed. Therefore, laminar flow is formed in the distal region of the handheld device.

[0033] Preferably, at least one funnel-shaped through-channel of the intermediate section or the second cross-section of the channel portion proximal to the intermediate section and the circular cross-section of at least one through-channel of the proximal section are designed to accommodate the proximal region of at least one electrode arm. A seal, preferably a fluid seal, can be incorporated within at least one through-channel of the proximal section, which can be secured proximal to the intermediate section during the connection of the intermediate and proximal sections. This seal prevents irrigation fluid from flowing proximal to the electrical contacts of the electrode arm through the through-channel during treatment.

[0034] It is also conceivable that the main body with three sections is designed as an integral metal body through which the holes and channels extend. Attached Figure Description

[0035] A preferred embodiment of the present invention will be explained in detail below with reference to the figures, wherein:

[0036] Figure 1 A schematic diagram of an electrosurgical resection device is shown.

[0037] Figure 2 A schematic diagram of the electrode tool is shown.

[0038] Figure 3 An exploded view showing the distal segment, the middle segment, and the proximal segment is shown.

[0039] Figure 4 A view showing the far end of the middle section, and

[0040] Figure 5 The cross-sections of the distal, intermediate, and proximal sections are shown.

[0041] List of reference numerals

[0042] 10 Electrosurgical resection mirror

[0043] 11. Support frame

[0044] 12 strokes

[0045] 13 Distal segment

[0046] 14 Handle Units

[0047] 15. Middle Section

[0048] 16 Holding components

[0049] 17 Contact Body

[0050] 18 Optical Device Guiding Mechanism

[0051] 19. Proximal segment

[0052] 20 Optical component guide plate

[0053] 21 Spring components

[0054] 22 Inner rod

[0055] 23 Electrode Tools

[0056] 24 electrodes

[0057] 25 Thumb rings

[0058] 26 Guiding Mechanism

[0059] 27 Eyepiece

[0060] 28 electrode arms

[0061] 29 Electrode Arms

[0062] 30 Distal region

[0063] 31 Proximal end

[0064] 32 Proximal end

[0065] 33 Axis

[0066] 34 Proximal region

[0067] 35 Misalignment

[0068] 36 holes

[0069] 37 holes

[0070] 38 screws

[0071] 39 holes

[0072] 40 holes

[0073] 41 Distal

[0074] 42 Proximal

[0075] 43 Distal

[0076] 44 Proximal

[0077] 45 Through-passage

[0078] 46. ​​Seals

[0079] 47 Through passage

[0080] 48 Through-passage

[0081] 49. Passage Department

[0082] 50 Channel Section

[0083] 51. Passage Department Detailed Implementation

[0084] One possible embodiment of the electrosurgical handheld instrument, namely the electrosurgical resectoscope 10, is in Figure 1 The image is shown schematically. The electrosurgical resection mirror 10 has a support frame 11 on which an elongated tubular rod 12 can be fixed. The rod 12 is... Figure 1 It is shown in the shaded area and is fixed to the main body 52 of the support frame 11 from the near side.

[0085] In addition to the main body 52, the support frame 11 also has a handle unit 14. The handle unit 14 is correspondingly attached to the intermediate section 15. The section 15 may have a handle, in particular a detachable one. The intermediate section 15 is fixedly or detachably mounted on the main body 52, while in the embodiment of the support frame 11 shown here, the grip 16 is correspondingly attached to the contact body 17. It is conceivable that the grip 16 is screwed onto the contact body 17.

[0086] The contact 17 is guided to slide on the tubular optical device guide mechanism 18. Because the contact 17 can move back and forth along the longitudinal direction of the electrosurgical resection mirror 10 or the longitudinal axis of the rod 12 on the optical device guide mechanism 18, the contact 17 is also referred to as a slide. The optical device guide mechanism 18 is detachably connected to the intermediate section 15 via the proximal section 19 of the main body 52, particularly through an adapter, at its distal end, while the optical device guide plate 20 is fixed at the proximal end of the optical device guide mechanism 18. The tubular optical device guide mechanism 18 extends through the optical device guide plate 20, allowing the optical device guide mechanism 18 to be approached from the proximal side.

[0087] The gripper 16 or contact 17 is connected to the optical device guide plate 20 via a spring 21. The spring 21 can be a tension spring or a compression spring, depending on the configuration of the support frame 11.

[0088] From the body 52 or the distal segment 13, particularly the main body, a tubular inner tube 22 extends in the distal direction. An electrode tool 23 extends parallel to the inner tube 22. The electrode tool 23 is guided through the distal segment 13, the intermediate segment 15, and the proximal segment 19, or these three channel portions 49, 50, and 51, and is detachably mechanically connected to the contact body 17 with at least one proximal contact. At the distal end, the electrode tool 23 has an electrode 24. The electrode 24 is capable of withstanding high-frequency voltage. Diseased tissue can be treated or cut using thermal plasma formed at the electrode 24. For this purpose, the surgeon moves a grip 16 with a thumb ring 25 relative to the intermediate segment 15. To stabilize the electrode tool 23, it can be guided through the inner tube 22 via a guide mechanism 26.

[0089] To perform the surgery, a rod-shaped optics device is guided through the inner tube 22 or optics guide mechanism 18. A distal end of the optics device, not visible here, points to electrode 24 so that the surgeon can visualize the treatment of the tissue. This optics device can be a rod-lens system or fiberglass. An eyepiece 27 or camera, such as... Figure 1 The location shown is near the end of the optical device.

[0090] exist Figure 2 The diagram illustrates a possible embodiment of the electrode tool 23 for the electrosurgical resection mirror 10. The electrode tool 23 essentially consists of two electrode arms 28, 29 interconnected by electrodes 24 in the distal region 30. The proximal ends 31, 32 of the two electrode arms 28, 29, as described above, are used not only for mechanical connection with the contact body 17 but also for electrical connection thereto. The two electrode arms 28, 29 are oriented not only parallel to each other but also parallel to an axis 33. In order to stabilize the two arms 28, 29 and to guide the electrode tool 23 on the inner tube 22, the electrode arms 28, 29 are interconnected by two guide mechanisms 26 in the embodiment shown here.

[0091] The distal regions 30 of the two electrode arms 28, 29 are respectively displaced parallel to each other relative to the proximal regions 34 by a stepped misalignment 35. The S-shaped misalignment 35 is used to position the two proximal ends 31, 32 of the electrode arms 28, 29 in preferred positions to achieve mechanical and electrical connection. It has proven particularly advantageous to place the misalignment 35 in the proximal region 34, because this allows for the formation of good flushing fluid flow characteristics in the distal region 30.

[0092] exist Figure 3 An exploded view of the distal segment 13, the middle segment 15, and the proximal segment 19 is shown. In the embodiment shown here, the proximal segment 19 is fixedly connected to the tubular optical device guide mechanism 18. At the proximal end, the optical device guide mechanism 18 is connected to the optical device guide plate 20. As previously described, in the assembled state of the electroresection mirror 10, the contact body 17 is moved onto the optical device guide mechanism 18. Other features will not be described further here, as they are irrelevant to the invention to be protected.

[0093] The proximal section 19 or adapter has an axial hole 36 that extends directly into the optical device guide mechanism 18. Similarly, the intermediate section 15 or handle has an axial hole 37. The distal section 13 or body also has an axial opening or axial hole, but it is located in... Figure 3 It is not visible. In the assembled state of the distal section 13, the intermediate section 15 and the proximal section 19, the axial holes 36, 37 and the opening overlap, so that they form the same channel for, for example, optical devices.

[0094] The distal section 13 is equipped with an inner tube 22 in the distal direction. The inner tube 22 is a direct extension of the axial holes 36 and 37 and the optical device guide mechanism 18.

[0095] Distal segment 13, intermediate segment 15 and proximal segment 19 as shown Figure 3 The sections shown are detachably connected to each other using three screws 38. For this purpose, the distal side 41 of the proximal section 19 is engaged to the proximal side 42 of the intermediate section 15, and the distal side 43 of the intermediate section 15 is engaged to the proximal side 44 of the distal section 13. Then, the three screws 38 pass through three corresponding holes 39 in the proximal section 19 and three corresponding holes 40 in the intermediate section 15 from the proximal direction. Figure 4 And it is screwed into three corresponding holes with internal threads (not shown here) in the distal section 13. For repair or maintenance purposes, these three sections 13, 15, 19 or the three components can be disassembled again by loosening screw 38.

[0096] In the assembled state of sections 13, 15, and 19, the electrode tool 23 passes through these three sections 13, 15, and 19 with two proximal ends 31 and 32 for mechanical and electrical connection, so as to subsequently lock into the contact body 17. For this purpose, the proximal section 19 has a circular through-channel 45. The through-channels 45 are spaced apart from each other and arranged parallel to the axial hole 36. In order to prevent the outflow of rinsing fluid during the use of the electrosurgical resection mirror 10, each of the two through-channels 45 can be fitted with a sealing ring 46. In the assembled state, the two sealing rings 46 are clamped or locked between the distal side 41 of the proximal section 19 and the proximal side 42 of the intermediate section 15.

[0097] The middle section 15 also has two parallel through channels 47. The through channels 47 are designed in a funnel shape, wherein the first cross-section of the through channel 47 on the distal side 43 of the middle section 15 is designed to be elliptical or elongated. Figure 4 The second cross-section of the through-channel 47 near the proximal side 42 of the intermediate segment 15 has the same cross-section or diameter as the through-channel 45 of the proximal segment 19. The cross-section of the through-channel 47 continuously narrows or funnel-shaped from the distal side 43 to the proximal side 42 of the intermediate segment 15. Figure 4 ).

[0098] The distal segment 13 also has two through channels 48. Figure 3 The through-channels 48, which are not visible in the middle section, are also oriented parallel to each other and parallel to the holes 37, 36 or the inner tube 22, and have an elliptical or elongated cross-section, which coincides with the cross-section of the through-channel 47 of the middle section 15 on the distal side 43 of the middle section 15. The through-channel 48 of the distal section 13 does not change its cross-section.

[0099] In the assembled state, the through channels 45, 47, and 48 overlap, forming a coherent guide mechanism for the two electrode arms 28 and 29. As per... Figure 5 As shown in the cross-sectional view, the electrode tool 23 is guided through the through channels 45, 47 and 48 such that the misalignment 35 of the electrode arms 28 and 29 is located exactly within the elongated through channel 48 of the distal segment 13.

[0100] Also from Figure 5 The funnel-shaped through-channel 47 of the middle section 15 is clearly seen as serving as an auxiliary insertion mechanism for the proximal end 31 of the electrode arm 28. When the electrode arm 28 is inserted into the through-channel 48, the proximal end 31 is automatically guided into the through-channel 45 by the funnel-shaped design of the through-channel 47. Here, the through-channel 45 is sealed against the through-channels 47 and 48 by the seal 46, preventing fluid penetration.

[0101] This design, through the channel 48, allows the misalignment 35 to move in both distal and proximal directions during the axial displacement of the electrode tool 23. This is necessary for performing the cutting motion using the electrode 24 as described above. By shifting the misalignment 35 into the body 52, the distal region of the inner tube 22 remains free for undisturbed flow of the flushing fluid.

[0102] The through channels 45, 48 within the proximal section 19 or the main body 52 of the metal are manufactured by drilling, milling, or wire cutting, while the more complex funnel-shaped through channel 47 in the middle section 15 is manufactured by injection molding. Therefore, through the design of these components described herein, manufacturing is simplified or costs are reduced, and the flow characteristics of the flushing fluid are improved.

[0103] Alternatively, the main body 52 may be constructed as a single unit, wherein the main body 52 may be divided into three segments 13, 15, and 19. In embodiments of the invention, axial holes 36 and 37 and channel portions 49, 50, and 51 are formed continuously through the entire main body 52. ​​The integral segments 13, 15, and 19 of the main body 52 are collectively made of metal and preferably by drilling, turning, milling, and / or countersunk cutting.

Claims

1. A middle section (15) of a body (52) for an electrosurgical handheld instrument, wherein, The intermediate section (15) is detachably or fixedly connected to the distal section (13) of the body (52) on the distal side (43), and the intermediate section (15) is proximally connected to the proximal section (19) of the body (52) on the proximal side (42). The intermediate section (15) has an axial hole (37) for the passage of a rod-shaped component of the handheld device, and the intermediate section (15) has at least one through-hole (47) parallel to the axial hole (37) for... The electrode arms (28, 29) of the electrode tool (23) of the handheld device pass through the through channel (47), characterized in that the through channel (47) is designed in the shape of a funnel, wherein the middle section (15) is a handle, wherein the cross-section of the through channel (47) narrows from the distal side (43) of the handle to the proximal side (42), wherein the first cross-section of the through channel (47) on the distal side (43) is designed to be elliptical, and the second cross-section of the through channel (47) on the proximal side (42) is designed to be circular.

2. The intermediate segment (15) according to claim 1, characterized in that, The first cross section of the through channel (47) transitions continuously to the second cross section of the through channel (47).

3. The intermediate segment (15) according to claim 1 or 2, characterized in that, The first cross-section of the elliptical through-channel (47) has a principal axis oriented vertically and a secondary axis oriented horizontally.

4. The intermediate segment (15) according to claim 1, characterized in that, Two through channels (47) are provided for each of the electrode arms (28, 29) of the electrode tool (23) of the handheld device to pass through, wherein the two through channels (47) are designed to be funnel-shaped and oriented parallel to each other and parallel to the axial hole (37).

5. The intermediate segment (15) according to claim 4, characterized in that, The two principal axes of the elliptical cross-sections of the two through channels (47) are parallel to each other.

6. The intermediate segment (15) according to claim 1, characterized in that, The middle section (15) is manufactured as a plastic injection molded part.

7. The intermediate segment (15) according to claim 1, characterized in that, The middle section (15) is used for the electrosurgical resection mirror (10).

8. The intermediate segment (15) according to claim 1, characterized in that, The intermediate section (15) can be detachably or fixedly connected to the body of the main body (52) on the distal side (43), and the intermediate section (15) can be connected to the adapter of the main body (52) on the proximal side (42).

9. The intermediate segment (15) according to claim 2, characterized in that, The elliptical cross-section of the through channel (47) transitions continuously to the circular cross-section of the through channel (47).

10. A distal segment (13) of a body (52) for an electrosurgical handheld instrument, wherein, The distal segment (13) is connected distally to the tubular rod (22) and proximally (44) to the intermediate segment (15) of the body (52) according to claim 1 in a detachable or fixed manner, wherein the distal segment (13) has an axial opening or axial hole for passing through or receiving the rod-shaped component of the handheld device, and wherein the distal segment (13) has at least one through channel (48) parallel to the axial opening for passing through the electrode arm (28, 29) of the electrode tool of the handheld device, characterized in that the at least one through channel (48) has an elliptical cross section or an elongated hole cross section.

11. The distal segment (13) according to claim 10, characterized in that, One principal axis of the elliptical cross-section of the through channel (48) is vertically oriented, and one secondary axis of the elliptical cross-section is horizontally oriented.

12. The distal segment (13) according to claim 10 or 11, characterized in that, Two through channels (48) are provided for each of the electrode arms (28, 29) of the electrode tool (23) of the handheld device to pass through, wherein the two through channels (48) have an elliptical or elongated cross section and are oriented parallel to each other and parallel to the axial opening.

13. The distal segment (13) according to claim 12, characterized in that, The two principal axes of the elliptical cross-sections of the two through channels (48) are parallel to each other.

14. The distal segment (13) according to claim 10, characterized in that, The axial opening and the at least one through channel (48) are formed as the same opening.

15. The distal segment (13) according to claim 10, characterized in that, The distal segment (13) is the body.

16. The distal segment (13) according to claim 10, characterized in that, The distal segment (13) is used for the electrosurgical resection device (10).

17. A proximal segment of the body (52) of an electrosurgical handheld instrument, wherein, The proximal segment (19) is detachably or fixedly connected to the intermediate segment (15) of the body (52) according to claim 1 on the distal side (41) and is connected to the tubular rod (22) on the proximal side, wherein the proximal segment (19) has an axial hole (36) for the rod-shaped component of the handheld device to pass through, and wherein the proximal segment (19) has at least one through channel (45) parallel to the axial hole (36) for the electrode arm (28, 29) of the electrode tool (23) of the handheld device to pass through, characterized in that the at least one through channel (45) has a circular cross-section.

18. The proximal segment (19) according to claim 17, characterized in that, The at least one through channel (45) has a seal (46) integrated into the proximal segment (19).

19. The proximal segment (19) according to claim 18, characterized in that, The at least one through-channel (45) has a fluid seal.

20. The proximal segment (19) according to claim 17 or 18, characterized in that, Two through channels (45) are provided for passing through an electrode arm (28, 29) of the electrode tool (23) of one of the handheld devices, respectively, wherein the two through channels (45) have circular cross-sections and are parallel to each other and oriented parallel to the axial hole (36).

21. The proximal segment (19) according to claim 17, characterized in that, The proximal segment (19) is an adapter.

22. The proximal segment (19) according to claim 17, characterized in that, The proximal segment is used for electrosurgical resection (10).

23. An electrosurgical handheld instrument, the electrosurgical handheld instrument having an electrode tool (23) and a body (52), the body being capable of being composed of three segments, namely, a middle segment (15) according to claim 1, a distal segment (13) according to claim 8, and a proximal segment (19) according to claim 13, wherein, The distal side (41) of the proximal segment (19) and the proximal side (42) of the intermediate segment (15) can be connected in a separable or fixed manner, and the distal side (43) of the intermediate segment (15) and the proximal side (44) of the distal segment (13) can be connected in a separable or fixed manner, and the axial hole (36,37) and the openings or holes of each segment (19,15,13) overlap and align in the connected state, wherein each segment (13,15,19) has at least one through channel (45,47,48) parallel to the axial hole (36,37) or the opening for the electrode arm (28,29) of the electrode tool (23) to pass through. The characteristic is that the first cross-section of the funnel-shaped through-channel (47) of the middle section (15) on the far side (43) of the middle section (15) is the same as the elliptical or elongated cross-section of the through-channel (48) of the far side section (13), and the second cross-section of the funnel-shaped through-channel (47) of the middle section (15) on the near side (42) of the middle section (15) is the same as the circular cross-section of the through-channel (45) of the near side section (19), wherein, in the connected state, the through-channels (48, 47, 45) of the far side section (13), the middle section (15) and the near side section (19) are superimposed to form an electrode arm guide mechanism.

24. The electrosurgical handheld instrument according to claim 23, characterized in that, The electrosurgical handheld instrument is an electrosurgical resectoscope (10).

25. The electrosurgical handheld instrument according to claim 23, characterized in that, The three parts are the handle, the body, and the adapter.

26. An electrosurgical handheld instrument, the electrosurgical handheld instrument having an electrode tool (23) and a body (52), the body (52) having three sections, namely, a distal section (13), a proximal section (19) and a middle section (15), wherein, These segments (13, 15, 19) have holes for accommodating optical devices and, parallel to them, at least one through channel (45, 47, 48) for the electrode arms (28, 29) of the electrode tool (23) to pass through. The through channel (45, 47, 48) is characterized by being composed of three channel portions, wherein the first cross-section of the first channel portion (49) passing through the distal segment (13) is designed to be elliptical or elongated, and the third cross-section of the third channel portion (51) passing through the proximal segment (19) is designed to be circular, and wherein the second cross-section of the second channel portion (50) passing through the middle segment (15) is designed to be funnel-shaped, wherein the funnel-shaped cross-section continuously changes from the first cross-section to the third cross-section.

27. The electrosurgical handheld instrument according to claim 23 or 26, characterized in that, The distal section (13), the intermediate section (15), and the proximal section (19) each have two through channels (48, 47, 45), which are parallel to each other and parallel to the axial holes (36, 37) and / or the opening orientation, and are used to accommodate the two electrode arms (28, 29) of the electrode tool (23).

28. The electrosurgical handheld instrument according to claim 23 or 26, characterized in that, At least one of the electrode arms (28, 29) of the electrode tool (23) has a misalignment (35), wherein the misalignment (35) is designed as a stepped transition between the proximal and distal regions (34, 30) of the electrode arm (28, 29) and the two regions (34, 30) are oriented parallel to each other.

29. The electrosurgical handheld instrument according to claim 23 or 26, characterized in that, At least one through channel (48) of the distal segment (13) or a first channel portion (49) having an elliptical or elongated cross-section is designed such that the misalignment (35) of the electrode arms (28, 29) can move back and forth in the proximal and distal directions within the through channel (48) or within the first channel portion (49).

30. The electrosurgical handheld instrument according to claim 26, characterized in that, The second cross section of at least one of the funnel-shaped through channels (47) or the second cross section of the second channel portion (50) on the proximal side (42) of the middle section (15) and the circular cross section of at least one through channel (45) of the proximal section (19) or the third channel portion (51) are designed to accommodate the proximal region (34) of at least one electrode arm (28, 29).

31. The electrosurgical handheld device according to claim 23 or 26, characterized in that, A seal (46) is integrated in at least one through channel (45) of the proximal section (19), the seal (46) being able to be fixed through the proximal side (42) of the intermediate section (15) in the connected state of the intermediate section (15) and the proximal section (19).

32. The electrosurgical handheld instrument according to claim 31, characterized in that, A fluid seal is integrated in at least one through channel (45) of the proximal section (19), the fluid seal being able to be fixed through the proximal side (42) of the intermediate section (15) when the intermediate section (15) and the proximal section (19) are connected.

33. The electrosurgical handheld instrument according to claim 26, characterized in that, The main body (52) having the three sections (13, 15, 19) is designed as an integral metal body, with the holes and the channels extending through the integral metal body.

34. The electrosurgical handheld instrument according to claim 26, characterized in that, The electrosurgical handheld instrument is an electrosurgical resectoscope (10).

35. The electrosurgical handheld instrument according to claim 28, characterized in that, At least one of the electrode arms (28, 29) of the electrode tool (23) has an S-bend.

36. The electrosurgical handheld instrument according to claim 23, characterized in that, The second cross section of at least one of the funnel-shaped through channels (47) or the second channel portion (50) of the second cross section of the proximal side (42) of the middle section (15) and the circular cross section of at least one through channel (45) or the third channel portion (51) of the proximal section (19) are designed to accommodate the proximal region (34) of at least one electrode arm (28, 29).

37. The electrosurgical handheld instrument according to claim 23, characterized in that, The main body (52) having the three sections (13, 15, 19) is designed as an integral metal body, with the holes and channels extending through the integral metal body.

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