DE102009060714B4 - Suction-irrigation handle for an endoscopic instrument - Google Patents

Abstract

Suction-flush handle (2) for an endoscopic instrument, wherein the handle (2) has a receptacle (6) for a working instrument (4), which is designed such that a recorded working instrument (4) in the receptacle (6) about its longitudinal axis (X) is rotatable, and in the receptacle (6) at least one locking element (14) is arranged, which is adapted to cooperate with corresponding locking means (12) on the working instrument (4) latching such that a rotation of the working instrument (4) can take place only in defined latching steps with application of a certain minimum force to rotate from a detent position to the next detent position, characterized in that in the handle (2) an actuating element (22) is present, by means of which the latching element (14) between a detent position, in which it cooperates with the latching means (12), and a release position, in which it does not cooperate with the latching means (12), is movable, wherein the Locking element (14) and the adjusting element (22) are designed such that the latching element (14) is held automatically without external actuation respectively permanently in the locking position or the release position, so that a permanently switched on and off latching function is provided.

Description

The invention relates to a suction-flush handle for an endoscopic instrument according to the preamble of claim 1 and an endoscopic instrument with such a suction-flush handle.

Pathological changes of the paranasal sinuses often require an endoscopically controlled rehabilitation of the affected areas. In addition to the unobstructed view of the surgical area, which is achieved by the suction-irrigation function of a corresponding suction-irrigation handle, the quiet instrument guidance, especially when using the instruments in the transition to the cerebral region of great importance. In this case, it is necessary to be able to rotate a working instrument connected to the suction-flushing handle about its longitudinal axis relative to the handle. For this purpose, solutions are known in which the working tool can be rotated detent on the handle. However, the detent has the disadvantage that a quiet continuous movement of the working instrument relative to the handle is no longer possible. In addition, the insertion and removal of the working instrument from the handle is made difficult by the detent.

DE 44 20 608 A1 discloses a medical multifunctional endoscopic surgical instrument having an operating handle and an instrument body connected thereto. In this case, the instrument body is rotatable relative to the instrument base about a longitudinal axis, wherein a free rotational movement is provided without detent. In addition, the instrument has a vorschiebbares working instrument, which is held by a releasable locking connection in its axially advanced position.

US 5,395,312 A1 shows a surgical instrument with a handle and a tool connected to this. This instrument has suction and flush ports on the handle.

US 5,902,264 discloses an endoscopic instrument in which a work insert is rotatable in steps. For this purpose, a locking device is to be released by pressing a release button, after which the shaft is rotatable in 90 ° increments. When the release button is released, the locking element engages in its locking position and blocks the rotatability of the shaft.

It is therefore an object of the invention to provide an improved suction-irrigation handle for an endoscopic instrument, in particular for use in endoscopically controlled rehabilitation in the sinus area, which always provides the required safe instrument guidance with better controllability of the rotation of the working instrument in the suction Rinsing handle allows.

This object is achieved by a suction-flush handle with the features specified in claim 1 and by an endoscopic instrument with the features specified in claim 8. Preferred embodiments will become apparent from the appended subclaims, the following description, and the attached figures.

The suction-flush handle according to the invention is intended for use in an endoscopic instrument. In particular, the suction-flush handle to a recording for a working instrument. In this recording, a working tool can be used to connect this with the suction-flush handle and in particular the suction-flushing channels inside the handle. In this case, the receptacle is configured such that a recorded working instrument in the receptacle is rotatable about its longitudinal axis. In addition, at least one locking element is arranged in the receptacle, which is suitable. cooperating with corresponding latching means on the working instrument latching. Due to the interaction of the at least one locking element with the locking means, the free rotation of the working instrument is prevented in the recording and the rotation can be done only in defined locking steps. In this case, a certain minimum force is required to turn the working tool from a detent position to the next detent position. In this way, an unintentional rotation of the working instrument is prevented in the handle. By arranging and number of locking means and locking elements defined angle steps, in which the working instrument is rotatable in the receptacle, can be specified.

According to the invention, this detent, which is caused by the locking elements and locking means, but not permanently. Rather, an adjusting element is present in the handle, by means of which the latching element is movable between a detent position and a release position. In the locking position, the locking element cooperates with the locking means in the manner described above, so that the working tool can be rotated relative to the handle only in defined steps. In the release position, the at least one locking element with the locking means does not cooperate, but the rotation of the working instrument is completely released in the recording and the working instrument can be rotated freely in the recording. Thus, a rotation is possible free of predetermined locking steps and predetermined angular steps. In addition, a quiet continuous Rotation and thus a quiet instrument guide in this position of the control element possible.

The locking element and the adjusting element are designed such that the locking element is held automatically permanently in the locked position or the release position. This means that the actuator must be operated only to switch between locking position and release position. After this switchover, the selected position is maintained permanently until the next switching without external operation. That is, in the suction-flush handle according to the invention, it is possible without further operation of any controls to rotate the working tool freely in the recording. In addition, a locking rotation can be selected, which in turn does not require after the selection made to operate further controls to provide this restoring twistability. This simplifies handling for the surgeon, as he does not permanently need a hand or a finger to hold the instrument permanently in the release position or the detent position. Rather, only the switching between the two settings requires a short handle to actuate the actuator. In addition, when the release position is selected, the working instrument and the handle can be easily assembled because the detent member and / or the detent means do not hinder the assembly in this state. According to the invention thus a permanently on and off switchable locking function is provided in the receptacle for the working instrument.

The at least one latching element is preferably a latching ball loaded by a spring. Such a detent ball can roll away on rotation of the working instrument in the receptacle via corresponding projections of the locking means or slide away, wherein the ball is moved against the spring force. That is, the spring force defines the force which is required to overcome the individual detents or latching steps.

Preferably, the spring is located with an end remote from the detent ball on a contact surface, which is movable via the actuating element. Due to the mobility of this contact surface, the bias of the spring can be changed and ideally the spring can be almost completely relaxed, so that the associated detent ball is no longer held by the spring in engagement with the corresponding locking means. Preferably, the contact surface is movable over the adjusting element in the effective direction of the spring force of the spring. The spring is preferably designed as a compression spring. Now, if the contact surface in the effective direction of the spring further away from the locking means with which the detent ball cooperates, moves the spring and the detent ball is no longer held by the spring in engagement with the locking means. Thus, the above-described release position is realized. In order to realize the detent position, the contact surface is moved via the adjusting element into a position in which it is closer to the locking means out, that is, in which the spring is compressed such that a spring force is generated in a compression spring, which the Detent ball holds in engagement with the locking means, so that to overcome and overcome the respective detent a predetermined force of the spring force is overcome.

The actuating element preferably has a pivotable lever. Such a lever may be pivotable about an axis of rotation, wherein it has at least two defined angular positions, of which a first corresponds to the release position and a second of the detent position. In this case, the adjusting element is designed so that it can not move automatically between the two angular positions, but that always a manual operation is required. Such trained as a pivoting lever actuator is easy to operate and also makes it easy to recognize the selected position.

More preferably, the lever is pivotable about an axis of rotation which extends parallel to the direction of movement of the locking element. The direction of movement of the latching element preferably extends in the radial direction relative to the longitudinal axis of the receptacle or the longitudinal axis of a working instrument arranged in the receptacle. The axis of rotation of the lever thus extends in this case, for example, either also radially to this longitudinal axis or is arranged tangentially to the receptacle. By this arrangement, a compact design is achieved on the one hand, on the other hand, the lever of the actuating element can be arranged easily accessible laterally on the handle.

On the lever is further preferably formed an inclined plane on which the locking element is supported directly or indirectly. This inclined plane can serve as a contact surface for the locking element with force acting spring. In this case, the spring can come directly to the inclined plane to the plant or there may be other components in the power flow between the slated plane and spring. For example, at the rear end of the spring, that is, the detent element facing away from the spring a contact head or sliding element may be attached, which facing the inclined plane may be formed, for example, hemispherical. Alternatively, here also a rolling body can be arranged to allow easy sliding along the inclined plane. The inclined plane preferably extends such that between the surface portions of the inclined plane located at both longitudinal ends a distance is given in the direction of the axis of rotation. That is, the surface of the inclined plane extends in a plane which extends at an angle of less than 90 ° to the axis of rotation. In this way, when turning the lever is achieved that serve in the preferred two switching positions of the lever different points of the inclined plane for supporting the locking element, wherein the distance between the slanted plane and locking element changes. Thus, in a pressure element arranged between latching element and inclined plane compression spring at a small distance this compression spring be compressed, so that a compressive force is exerted on the locking element, while at the other end of the inclined plane caused greater distance between the surface of the inclined plane and the locking element the spring is correspondingly relaxed, so that no pressure force is exerted on the latching element. This then corresponds to the release position in which the latching element is not held in engagement with the corresponding latching means.

The invention further provides an endoscopic instrument with a suction-flush handle according to the foregoing description and a working instrument whose proximal end is designed such that it can be inserted into the receptacle of the handle. The proximal end of the working instrument is designed, for example, as a sealing cone, wherein the receptacle is tapered correspondingly, so that the inner surfaces of the receptacle can come into sealing contact with the outer surfaces of the sealing cone. According to the invention locking means are arranged at the proximal end of the working instrument, which correspond to the at least one locking element of the handle to cooperate with this locking, when the locking element is in the locked position. In the release position, the latching element is not in engagement with the latching means or substantially does not interact with them, so that the working instrument can be freely rotated in the receptacle.

The latching means are preferably designed as latching grooves or correspondingly acting depressions in the surface of the working instrument. Alternatively, the latching means may also be designed as latching projections which project outwardly on the surface of the working instrument. The latching grooves preferably have a cross-sectional profile adapted to the latching element, so that the latching means and a latching groove fix the working instrument in a desired defined angular position.

More preferably, at the proximal end of the working instrument an outer circumference of the working tool annularly surrounding arrangement of locking grooves is formed. In this case, the locking grooves extend in their longitudinal directions preferably parallel to the longitudinal axis of the working instrument, d. H. parallel to the longitudinal axis of the annular arrangement of the locking grooves. The arrangement thus extends in the direction of rotation of the working instrument. The locking grooves are preferably uniformly spaced over the outer periphery of the working instrument distributed so that uniform locking steps are defined in predetermined angular positions. By size and number of locking grooves, the number of rest steps is defined upon rotation of the working instrument.

The invention will now be described by way of example with reference to the accompanying drawings. In these shows:

1 a side view of an endoscopic instrument with a suction-flush handle and an inserted working instrument,

2 a sectional view taken along the lines II-II in 1 .

3 a sectional view taken along the line III-III in 1 .

4 a side view similar to the side view according to 1 with a second variant of suction-flushing connections,

5 a partial sectional view taken along the line VV in 4 .

6 4 is a partially sectional view of a suction-flushing handle with suction-flushing ports according to another embodiment;

7 a sectional view taken along the line VII-VII in 6 .

8th a partial sectional view corresponding to the view in

5 with a further embodiment of suction-flushing connections,

9 a partial sectional view corresponding 8th , with a further embodiment of suction-flushing connections,

10 a cross section of a suction-flushing handle according to the invention with a bridging insert inserted into a valve seat,

11 a schematic view of an endoscopic instrument with a suction-flush handle according to 10 in its use,

12a . 12b . 12c in three different views a valve core according to a first embodiment,

13a . 13b . 13c in three different views a valve core according to a second embodiment.

14a . 14b . 14c a bridging operation in three different views, and

15 a side view of a suction-flush handle with an attached suction-Spülüb garnitur

1 shows in a side view a medical instrument with a suction-flush handle 2 with one in a receptacle 6 the suction rinse handle 2 used working tool 4 , The recording 6 extends through the suction-flush handle, so that the proximal end 8th and the distal end 10 of the working instrument 4 on opposite sides of the suction-flush handle 2 are located.

As based on the 1 to 3 will be explained, is the suction-flush handle shown 2 with a switchable on and off detent for the rotation of the working instrument 4 in the recording 6 equipped. The working tool 4 is basically about its longitudinal axis X in the recording 6 rotatable. With the on and off switchable detent can be achieved that the working tool 4 with detent off in the receptacle 6 can be freely rotated about the longitudinal axis X, while it is rotatable with latching engagement only against a certain resistance in predetermined latching steps. These locking steps are by locking means in the form of locking grooves 12 defined, which in an annular arrangement, the outer circumference of the working instrument 4 near its proximal end 8th surround. in the example shown are twelve locking grooves 12 provided, that is, the working tool 4 can be rotated in twelve locking steps each at an angle of 30 degrees detent when the locking function is turned on. When the detent is engaged, the detent function is activated by a detent ball 14 causes which of a compression spring 16 radially with respect to the longitudinal axis X against the outer periphery of the working instrument 4 in the area of Rastnuten 12 is pressed so that the detent ball, if it is a locking groove 12 opposite, from the spring force in this locking groove 12 is pressed. To turn the instrument 4 must be the detent ball 14 against the compression spring 16 moved radially outward to the between two adjacent locking grooves 12 overcome the survey. For this purpose, a certain torque is required, which is on the working tool 4 must act. As soon as the next locking groove 12 the detent ball 14 reached, this penetrates into this next locking groove 12 one and the next rest step is reached.

At the detent ball 14 opposite end of the compression spring 16 this is supported on a sliding element 18 from, which is mushroom-shaped in the example shown here and on one side a contact shoulder for the compression spring 16 has and has an opposite side which is hemispherical in shape. With this hemispherical side is the sliding element 18 on the surface of an inclined plane 20 at. This inclined plane 20 is best in 3 to recognize. In 3 is the working tool 4 from the recording 6 taken and therefore not shown. The inclined plane 20 is in a lever 22 formed, which represents an actuating element for switching on and off the detent. The lever 22 is a sleeve 24 , which defines a rotation axis D, rotatable. The axis of rotation D extends tangentially to the receptacle 6 parallel to the direction of action of the compression spring 16 , The compression spring 16 , the detent ball 14 as well as the sliding element 18 are in the sleeve 24 which are in the field of recording 6 in the suction-flush handle 2 is inserted, guided in the radial direction with respect to the longitudinal axis. When the lever 22 around the sleeve 24 is pivoted, the inclined plane moves 20 over the sliding element 18 , The inclined plane 20 extends obliquely to the axis of rotation D or the direction of action of the compression spring 16 so with the rotation of the lever 22 at the point where the sleeve 24 is located, the distance of the surface of the inclined plane 20 changes to the longitudinal axis X. In the in 2 shown position is the lever 22 so turned that the highest point of the inclined plane 20 above the sliding element 18 lies. That is, in this position lies above the slider 18 the surface of the inclined plane 20 closest to the longitudinal axis X, thereby becomes the sliding element 18 pressed radially inward and the compression spring 16 compressed, causing the detent ball 14 in the locking groove 12 is pressed. In the in 3 shown position is the flattest point of the inclined plane 20 above the sliding element 18 , so that in this position the distance of the surface of the inclined plane 20 at this point to the longitudinal axis X is greatest. This may cause the compression spring 16 relax and there is no radially inwardly directed pressure force from the compression spring 16 on the detent ball 14 exercised. Thus, in this position, the detent ball 14 not against the surface of the working instrument 4 and thus not in the Rastnuten 12 pressed, so the working tool 4 in the recording 6 free, that is rotatable without detent.

For the previously described switching function between a detent position of the detent ball 14 , in which this by a compressive force in the locking grooves 12 is pressed, and a release position in which the locking element or the detent ball 14 Not is pressed radially inward and thus permanently out of the locking grooves 12 can emerge, it is essential that by the rotation of the lever 22 a permanent switch is created. After pivoting the lever 22 in one of its two positions, ie the detent position or the release position, the lever remains 22 automatically in this position until it is manually moved back to the other position. This means that the detent can be permanently switched on or off. In 1 is the lever 22 in the position in which the detent is turned on. When the lever is moved against the direction of arrow B to its second position, which in 11 is shown, is the lever 22 in the release position.

Inside the handle 2 are a suction channel 26 and a flushing channel 28 educated. The suction channel 26 and the flushing channel 28 end with their one end, as in 3 shown, respectively in the picture 6 to connect to the working tool 4 manufacture. At the other end the suction channel ends 26 at a suction connection 30 and the flushing channel 28 at a flushing connection 32 , The suction connection 30 and the flushing connection 32 are in a first embodiment in the direction of arrow C in 4 pivotable about the Y axis. The suction-flushing connections 30 and 32 slide in, as in 5 shown on dovetailed protrusions 34 , In addition, the suction-flushing connections 30 . 32 interchangeable with the suction-flush handle 2 attached. This is due to the suction-flush handle 2 a carrier element 36 releasably secured. The carrier element 36 is about a locking screw 38 releasably fixed to the suction-flush handle. The suction channel 26 and the flushing channel 28 stand in a tubular outward, so they into the support element 36 protrude and there over O-rings 40 be sealed to the outside. From the carrier element 36 stand the projections 34 before, to which the actual suction and flushing connections 30 and 32 are held pivotally.

The pivotability of the suction connection 30 and the flushing connection 32 Allows these ports to be aligned so that the connected hoses are in a desired variable direction from the suction-flush handle 2 be carried away. Also the interchangeability of the suction connection 30 and the flushing connection 32 It is advantageous to define the outlet direction of the connected hoses as desired and, if necessary, by replacing the suction connection 30 and the flushing connection 32 to be able to change with differently formed connections.

According to a first embodiment, which in 5 shown are the suction port 30 and the flushing connection 32 tilted obliquely outwards. In a second embodiment, which in the 6 and 7 shown are the suction port 30 ' and the flushing connection 32 ' In addition, each with a ball joint 42 provided, which allows a pivoting in different directions in addition to the pivoting about the axis Y. The ball joints 42 allow pivoting in two mutually orthogonal planes, indicated by the arrows D and E in 6 and 7 , Another possible embodiment of the suction and flushing connections shows 8th , The embodiment shown there is similar to that in FIG 5 shown embodiment with the difference that the suction port 30 '' and the flushing connection 32 '' not oblique, but just arranged. Yet another embodiment shows 9 , In the embodiment shown there are the suction port 30 ''' the flushing connection 32 ''' in ball joints 44 pivotable in support elements 46 arranged. The carrier elements 46 again have O-rings 40 on, with which they sealingly on the projecting suction channel 26 as well as the above flushing channel 28 are attached. The carrier elements 46 are over the locking screw 38 on the handle 2 releasably fixed. About the ball joints 44 can the suction and flushing connections 30 ''' . 32 ''' on the one hand be pivoted outwards, on the other hand according to the direction of the arrow C in 1 be pivoted parallel to the longitudinal plane of the handle.

As with the preceding embodiments for the suction ports 30 and flushing connections 32 As shown, various configurations are conceivable to provide different exit directions and movabilities for these and the connected hoses. These can all, if desired, detachable with the handle 2 be connected and over the locking screw 38 be fixed. This easy replacement of the suction and flushing connections 30 . 32 allows a great flexibility when using the suction-flush handle 2 Moreover, it allows the surgeon to be able to adapt this very specifically to his personal needs with regard to the tube guidance. It should be understood that the embodiments shown for the suction and flushing connections 30 . 32 are not restrictive, but also other shapes and designs are conceivable.

Another aspect of the suction-flush handle 2 , which is described in more detail here, is the manner of operation of the suction-flushing function or the ways to adapt this operation in various ways. The suction and flushing channels 26 and 28 lead in the handle 2 through a valve seat 48 through which both channels 26 and 28 are interrupted. That is, the valve seat 28 lies in the flow path between the suction connection 30 and flushing connection 32 on the a page and the recording 6 on the other hand. In the valve holder 48 can be a valve core 50 be inserted or screwed. The valve insert 50 has a valve through which the suction channel 26 and the flushing channel 38 can be opened and closed. The valve is designed so that the suction channel 26 and the flushing channel 28 always be closed or opened depending on each other. That means z. B., then if the suction channel 26 is open, is the flushing channel 28 closed and vice versa.

In the valve holder 48 can use different valve inserts 50 be used. The 12 and 13 show two alternative valve inserts 50 and 50 ' , Both valve inserts each have a valve key 52 on, over which the valve is actuated. The valve insert 50 has a trained as a Tastventil valve. That is, by pressing the valve button 52 can be changed in this infinitely between suction and rinsing in the rest position, the suction channel 26 opened and the flushing channel 28 closed. By pressing the valve key 52 become the suction channel 26 closed and the flushing channel 28 open. This condition is held until the valve key 52 is released. Then the valve automatically returns to the first switching state. In contrast, in the second valve insert 50 ' a click or locking function provided, that is a click valve. By pressing the valve key 52 is at this valve insert 50 ' always switched between the two switching states. In the first switching state are also in this valve insert 50 the suction channel 26 opened and the flushing channel 28 closed. By pressing the valve button 52 the valve is brought into the second switching state, in which the suction channel 26 closed and the flushing channel 28 are open. This switching state is then also when releasing the pressure on the valve key 52 due to the latching of the valve held until the valve button 52 is pressed again. Only then does the valve move back to the first switching position.

In addition to the two valve inserts 50 and 50 ' can in the valve receptacle 48 in addition, a bridging operation 54 be used. This is in the inserted state in 10 and individually in 14a to 14c shown. The bridging insert 54 has no valve, but includes two separate, continuously opened flow paths 56 for the suction channel 26 and the flushing channel 28 , In this way, when the bridging operation 54 in the valve holder 48 is used, starting from the suction port 30 to the recording 6 a continuously opened suction channel and at the same time starting from the flushing connection 32 to the recording 6 a continuously opened flushing channel 28 created. This is advantageous if instead of a hand-operated valve in the handle 2 a footswitch 58 should be used as he is in 11 is shown.

The footswitch 58 assumes the function of the previously described valve inserts 50 and 50 ' and is used to activate or switch on and off the suction and rinsing function. The footswitch 58 is via a suction hose 60 with a suction pump S and a rinsing hose 62 connected to a scavenge pump I. Starting from the footswitch 58 lead the suction hose 60 continue to the suction connection 30 and the flushing hose 62 to the flushing connection 32 the suction rinse handle 2 , Inside the footswitch 58 a valve is provided which, when pressure is applied to the footswitch 58 the previously opened suction channel 60 closes and at the same time the flushing channel 62 opens. This valve is preferably designed as a Tastventil, but can also be used as a click valve similar to the valve core 50 ' be educated. Instead of using a valve in the true sense, the footswitch 58 Also be designed so that it closes the flow paths by disconnecting the respective hose. This is advantageous in terms of cleaning. When using such a footswitch 58 is then the bridging insert 54 in the handle 2 used as in 11 shown. So can one and the same handle 2 , which otherwise with a valve core 50 is used, alternatively with a footswitch 58 Find use.

15 shows a view similar to the view in FIG 8th with a variant of the connection of suction hose 60 and flushing hose 62 to the suction connection 30 '' or the flushing connection 32 '' , These are designed as based on 8th described. At this in 15 embodiment shown end of the suction hose 60 and the flushing hose 62 in a common connection element 64 , which has an adapter for connecting the hoses 60 . 62 with the suction connection 30 '' and the flushing connection 32 '' represents. In the connection element 64 Two couplings are formed, one of which with the suction hose 60 is connected and for receiving the suction port 30 '' serves while the other with the flushing hose 62 is connected and for receiving the flushing connection 32 '' serves. This is the connection element 64 at the same time on the suction connection 30 '' the flushing connection 32 '' attached, in which case a connection from the suction port 30 '' to the suction hose 60 and a connection from the purge port 32 '' to the flushing hose 62 is created. By a locking element 66 becomes the connecting element 64 on the suction connection 30 '' and the flushing connection 32 secured and can be solved by manual operation. This embodiment has the advantage that by means of the connecting element 64 both hoses 60 and 32 simultaneously with the handle 2 can be connected and disconnected again, so that the assembly of the system is simplified.

LIST OF REFERENCE NUMBERS

2

Suction-Irrigation handle

4

working tool

6

admission

8th

proximal end

10

distal end

12

locking grooves

14

detent ball

16

compression spring

18

Slide

20

inclined plane

22

lever

24

shell

26

suction

28

irrigation channel

30

suction

32

Flushing connection

34

projections

36

support element

38

locking screw

40

O-rings

42

ball joint

44

ball joint

46

support elements

48

valve receiving

50

valve core

52

valve key

54

bridging applications

56

flow paths

58

footswitch

60

suction

62

flushing hose

64

connection elements

66

locking element

I

irrigation pump

S

suction pump

X

longitudinal axis

D

axis of rotation

Y

axis of rotation

B

Swing direction of the lever 22

C

Swivel direction of the suction and rinse connections

D, E

Pivoting directions of the ball joint 40

Claims (10)

Suction-flush handle ( 2 ) for an endoscopic instrument, wherein the handle ( 2 ) a recording ( 6 ) for a working tool ( 4 ), which is designed such that a recorded working instrument ( 4 ) in the recording ( 6 ) is rotatable about its longitudinal axis (X), and in the receptacle ( 6 ) at least one latching element ( 14 ) is arranged, which is suitable, with corresponding locking means ( 12 ) on the working instrument ( 4 ) cooperating in such a latching manner that a rotation of the working instrument ( 4 ) can take place only in defined latching steps with application of a certain minimum force for rotation from a latching position to the next latching position, characterized in that in the handle ( 2 ) an actuator ( 22 ) is present, by means of which the latching element ( 14 ) between a detent position, in which it with the locking means ( 12 ) cooperates, and a release position in which it is not with the locking means ( 12 ) is movable, wherein the locking element ( 14 ) and the actuator ( 22 ) are formed such that the latching element ( 14 ) is held automatically without external actuation permanently in the locked position or the release position, so that a permanently on and off switchable locking function is provided. Suction-flush handle according to claim 1, characterized in that the at least one locking element by a spring ( 16 ) loaded detent ball ( 14 ). Suction-flush handle according to claim 2, characterized in that the spring ( 16 ) with one of the detent ball ( 14 ) facing away from an abutment surface ( 20 ), which via the actuator ( 22 ) is movable. Suction-flush handle according to claim 3, characterized in that the contact surface ( 20 ) via the actuator ( 22 ) in the effective direction of the spring force of the spring ( 16 ) is movable. Suction-flush handle according to one of the preceding claims, characterized in that the actuating element has a pivotable lever ( 22 ) having. Suction-flush handle according to claim 5, characterized in that the lever ( 22 ) is pivotable about an axis of rotation (D), which is parallel to the direction of movement of the locking element ( 14 ). Suction-flush handle according to claim 5 or 6, characterized in that on the lever ( 22 ) is formed an inclined plane at which the locking element ( 14 ) is directly or indirectly supported. Endoscopic instrument with a suction-flush handle ( 2 ) according to one of the preceding claims and a working instrument ( 4 ), whose proximal end is designed such that it is in the receptacle ( 6 ) of the handle ( 2 ), characterized in that at the proximal end of the working instrument ( 4 ) Locking means ( 12 ) are arranged, which to the at least one Locking element ( 14 ) of the handle ( 2 ) correspond and interact with this latching. Endoscopic instrument according to claim 8, characterized in that the latching means as latching grooves ( 12 ) are formed. Endoscopic instrument according to claim 9, characterized in that at the proximal end of the working instrument ( 4 ) one the outer circumference of the working instrument ( 4 ) annularly surrounding arrangement of locking grooves ( 12 ) is trained.

Images