Blade holder for surgical instrument

Abstract

The present invention relates to a tool holder for surgical instruments. In particular, a tool holder (23) according to the present invention is provided for use in a surgical instrument. The tool holder comprises a blade which can be operated by means of a second operating element (45). The blade is held in a blade housing which can be transferred from a first locking position (passive position) to a second locking position (active position) by means of a first operating element. In the passive position, the blade housing is completely located inside the holder housing and the blade is locked therein. In the active position, the blade housing protrudes out of the holder housing. Only in the active position can the lock between the blade housing and the blade be released, whereby only then a drive connection is established between the second operating element and the blade. Since the blade is held inside the blade housing, the remaining tissue carried by the blade during the retraction of the blade from the tissue is received in the blade housing and enclosed therein. As a result, cleaning and reuse of the instrument are simpler and safer.

Description

Technical Field

[0001] The present invention relates to a knife cartridge for a surgical instrument. Background Art

[0002] Surgical instruments, in particular for open surgical use, are often constructed in the type of forceps or scissors. For example, US2011 / 0004208A1 discloses such an instrument for fusing and cutting blood vessels. The two jaws of this forceps-like instrument, which are movable relative to each other, are provided with coagulation electrodes. In addition, a support for a knife holder is provided on the instrument, which knife holder includes a blade for cutting the fused blood vessel. If the blade has become blunt, the knife holder can be replaced in order to provide the instrument with a sharp blade again. In addition, the possibility of using a single-use knife on a sterilizable instrument or an instrument that can be reused multiple times is opened.

[0003] In sterilizable instruments for guiding the knife blades of a replaceable holder, a knife channel is provided which becomes contaminated during use of the instrument and is difficult to access for cleaning. However, the risk to the patient due to infectious material remaining in the instrument must be excluded. Summary of the invention

[0004] The object of the present invention is to provide measures which show how the safety for patients and / or persons can be increased during the use of a corresponding device.

[0005] This object is achieved by means of a knife holder according to claim 1 , which can however be connected to a surgical instrument.

[0006] The knife holder can be used on a forceps-like instrument, which is configured to cut tissue with the help of a blade held between two jaws. The blade is movably supported in a blade housing; the blade housing is in turn movably supported in a holder housing. This concept allows the blade housing to be first extended in a protected manner with the blade supported therein until the tissue is held between the jaws, so that the blade is then moved away from the blade housing in order to cut the tissue. If the blade is retracted into the blade housing after the cutting is completed, it can carry tissue adhesions and can therefore contaminate the blade housing internally. However, the channel provided in the instrument remains clean, through which the blade housing moves away from the holder housing until the jaws holding the tissue. Each part that has been in contact with the tissue is retracted into the blade housing and, if applicable, retracted into the holder housing with it and disposed of together with the holder housing after use. Each part that comes into contact with the knife channel of the instrument, i.e. the blade housing, does not come into contact with the tissue. In doing so, the knife holder according to the invention simplifies the cleaning and disinfection of surgical instruments. Furthermore, since the sharp blade is not guided and moved in a knife slot of the instrument but in a blade housing, possible wear of the instrument is reduced. Due to this concept, safety for the patient is increased.

[0007] The blade housing can be made of metal or also of plastic or a combination thereof. The blade housing can be configured as a rectangular tube surrounding the blade or as a rail and can be flexibly deformable. Thus, it can also move through the arcuate slot in the instrument while being flexibly deformable.

[0008] The knife holder according to the invention guides the blade inside the blade housing into its use position, i.e. into the tissue held between the jaws. As a result, the blade housing can be moved in a slot provided in the instrument, for example through the hinge area of ​​the instrument. The blade and in particular its cutting edge are protected. The cutting edge can neither touch along the part of the instrument and thus become blunt, nor can it produce scratches or the like on such instrument parts, in which contamination can remain. This increases the safety of the patient.

[0009] The tool holder is preferably provided with a latching device, which allows the holder housing to be releasably attached to the instrument. The latching device can be transferred from a latched position to a released position by means of a separate operating element. Alternatively, the latching device can also be operated by a first operating element, by means of which the blade housing can be moved. Thus, the operation is simple and intuitive.

[0010] The blade housing preferably includes a first locking position in which the blade housing is completely positioned within the holder housing. An insertion feeler provided on the holder housing may be configured to prevent operation of the first operating element and / or movement of the blade housing out of the first locking position. If the tool holder is located outside the instrument, the insertion feeler is used to prevent movement of the blade housing. Furthermore, if the tool holder is inserted into the instrument, the insertion feeler is used to release movement of the blade housing.

[0011] The insertion feeler is preferably a movably supported blocking member, which is elastically supported by a spring and is movable between a blocking position and a release position. In the blocking position, it blocks the blade housing from moving away from its first locking position (static position). Thus, the insertion feeler is preferably arranged so that if the tool holder is connected to the instrument, it is pushed away from its blocking position by means of the adjacent surface of the instrument to overcome its spring force in the release position. The movement of the blade housing is then released. When doing so, as long as the tool holder is not inserted into the instrument, the blade and its blade housing are immovably retained in the holder. They also cannot be moved away from the holder housing by clumsy manipulation. Therefore, injuries to the operator, the spread of infection, etc. are largely excluded.

[0012] If the carrier housing is coupled to the instrument and if the insertion probe thereby releases the movement of the blade housing, it can be transferred by operation of the first operating element in a second locking position (active position) in which the blade housing protrudes from the carrier housing.

[0013] Typically, the instrument includes a channel extending from a mount arranged to be close to the scissor joint of the instrument until a knife cutout constructed in the jaws of the instrument. In the second locking position, the knife housing moves forward until the knife cutout. During the movement of the blade housing away from the first locking position into the second locking position and back, the blade is fixedly (immovably) connected to the blade housing. This connection can be eliminated by means of a corresponding release movement of the first operating element in the second locking position, whereby the axial movement of the blade relative to the blade housing is also released subsequently. The release is carried out by means of a transfer device that simultaneously and drivingly connects the blade to the second operating element during the separation of the operating element from the blade. The second operating element can now be used to move the blade away from the blade housing and thereby cut, for example, biological tissue. The transfer device can also be expressed as a "switch", which is configured to alternately and drivingly connect the first or second operating element to the blade. Thus, the switch simultaneously connects the first operating element to the blade housing and the blade. If the switch is changed, the switch connects the second operating element exclusively to the blade.

[0014] If the transfer device (switch) has been activated by means of a corresponding movement of the first operating element, an operating lock can be effective between the first operating element and the second operating element, which releases the operation of the second operating element only for the movement of the blade, whereby the blade is disengaged from the blade housing and the second operating element is simultaneously coupled to the blade. This concept can also be used in embodiments of a tool holder without a blade housing, or in embodiments with a short blade housing that is completely retained in the tool holder, from which the blade has protruded or led out, while it is still moving distally.

[0015] As long as the transfer device allows a drive connection between the second operating element and the blade and there is no drive connection between the first operating element and the blade, a movement lock can be assigned to the first operating element, which blocks movement and thus displacement of the blade housing within the holder housing.

[0016] Furthermore, it is possible to release the latch connection between the tool holder and the instrument using the first operating element. For this purpose, the latching means provided on the holder housing can include a cam, with which the latching part can be moved in the release direction against the spring force. Furthermore, the first operating element can be provided with a cam, which can be moved against the cam of the latching part due to the corresponding application of force by the first operating element.

[0017] With the mechanism described in this way, it is ensured that the blade can only be moved away from the holder housing and the blade housing if the tool holder is correctly connected to the instrument and the blade housing is transferred to the active position. In the active position, the blade housing is positioned with its front face in the use position of the blade. The distance between the holder housing and the use position of the blade is bridged by means of the blade housing. The use position of the blade is positioned distally with respect to the hinge joint of the instrument, while the tool holder is arranged proximally with respect to this joint. The passage provided in the instrument for arranging the blade housing is not contaminated or is contaminated in a slight manner due to the proposed construction.

[0018] The carrier housing can only be removed from the instrument when the blade is retracted into the blade housing and the blade housing is retracted into the carrier housing. The carrier housing can only be unlocked from the instrument, i.e. released therefrom, when the blade housing is completely retracted into the carrier housing. After the carrier housing is released from the instrument, neither the blade housing nor the blade can be moved out of the carrier housing. The blade housing and the blade remain within the carrier housing. The cutting edge of the blade remains inaccessibly arranged inside the knife holder in each case. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Further advantageous details emerge from the claims as well as from the drawings with their figures and the corresponding description. The drawings show:

[0020] Figure 1 is a side view of an instrument according to the invention with a tool holder in a basic view,

[0021] Figure 2 is based on Figure 1 The tool holder is shown in a side view in a manipulable state with dotted lines,

[0022] Figure 3 is based on Figure 2 A tool holder, wherein the blade housing thereof is in an active position and the blade is extendable (shown extended in dashed lines),

[0023] Figure 4 is based on Figure 3 The tool holder cut along line IV-IV,

[0024] Figure 5 is based on Figure 1 A highly enlarged schematic perspective view of a portion of the instrument without a tool holder,

[0025] Figure 6 is based on Figure 3 A cross-sectional perspective and height-reduced view of a tool holder,

[0026] Figures 7 to 11 is based on Figure 2 and Figure 3 Schematic diagram of the kinematic principle of the tool holder in different positions and conditions. DETAILED DESCRIPTION

[0027] exist Figure 1 1 is a surgical instrument 12 having two legs 13, 14, which are pivotably connected to each other in the manner of forceps or scissors by means of a joint 15. The legs 13, 14 include handles 16, 17 at their proximal ends. The legs 13, 14 are at their distal ends jaws 18, 19, between which biological tissue can be held and compressed. For example, the tissue can be a blood vessel, other hollow vessels or also tendons, skin, muscles, etc. The jaws 18, 19 can be constructed in a smooth or slightly profiled manner. In addition, they can be made of conductive or non-conductive materials. If the surfaces 20, 21 of the jaws 18, 19 facing each other are constructed in a conductive manner, they can be constructed as electrodes, for example, so that the tissue held between the jaws 18, 19 is subjected to a current flow and used to coagulate and / or fuse the tissue. The surfaces 20, 21 facing each other thus form electrodes, which can be supplied with current via cables not otherwise illustrated or also a voltage source provided on the instrument. Furthermore, further elements may be provided, such as switches or the like, in order to control the current flow, in particular to switch it on and off.

[0028] The instrument 12 is preferably a blade ( Figure 3 , Figure 4 , Figure 6) to cut tissue. The blade 22 is part of a knife holder 23 that is releasably held on the instrument 12. For example, the leg 14 includes a seat for this purpose, for example, a compartment configured as a knife holder 23 into which the knife holder 23 can be inserted. The knife holder 23 is preferably configured for a single use, while the instrument 12 is configured as a sterilizable instrument 12 that can be reused multiple times. When the knife holder 23 is separated from the instrument after use and disposed of, the instrument 12 is cleaned and sterilized.

[0029] The tool holder 23 comprises a holder housing 24 which can be configured, for example, as a plastic injection-molded part. At its distal end in use, it is provided with a coupling structure 25 which fits into a corresponding complementary structure of the leg 14. For example, the coupling structure can be a bead-like projection which fits into a correspondingly shaped transverse groove 26 of the instrument 12. At its opposite proximal end, the holder housing 24 can comprise a latching device 27, of which a latching member 28 can be, for example, a part which is arranged inside the holder housing 24 and is pivotably supported. The latching member 28 can cooperate with a latching projection 28a of the instrument 12, which latches into the latching member 28 as soon as the holder housing 24 is moved towards the leg 14 by means of a pivoting movement about a transverse axis defined by the transverse groove 26. The coupling structure 25 and the transverse groove 26 thus form a pivot hinge. A spring 29, for example in the form of a pressure spring, a bendable flexible spring, a leaf spring, etc., can be part of the latching device 27. The spring means 29 can be an integral part of the latching member 28 or can be a flexible tongue formed inside the frame housing 24 or can also be a separate spring element. Inside the frame housing 24, the latching member 28 is movable by means of a pivot bearing 30, for example slidably or also pivotably held.

[0030] Furthermore, a blade housing 31 is arranged inside the frame housing 24, which blade housing can be designed as a flat rectangular tube or also as a flat guide rail, preferably made of metal or else also of plastic. Figure 4 and Figure 6 , which illustrates that at least the front portion of the blade housing 31 that can be moved away from the frame housing surrounds the flat blade 22 at two flat sides and narrow top and bottom sides. However, the blade housing 31 can be open on the narrow top side, at least along a portion of its length, in particular its proximal portion that always remains inside the frame housing 24. There, the extension 22a of the blade 22 can protrude out of the blade housing 31.

[0031] The blade housing 31 can also be opened in sections on one of the flat sides. The blade housing 31 can be opened, for example, on the side facing away from the cutting edge 32 of the blade 22. Figure 6, the cutting edge 32 may be arranged outside the center relative to the blade 22 and may directly adjoin a flat side surface of the blade 22. The other side surface 33 then transitions into an inclined surface 34, which extends up to the cutting edge 32. Preferably, the blade housing 31 is constructed so long that the blade 22 is completely located in the blade housing 31 in the retracted position. Thereby, the cutting edge 32 is located inside the blade housing 31. However, it is also possible to construct the blade housing in a shortened manner so that the blade 22 always protrudes slightly from the blade housing and the cutting edge 32 is located in front of the distal end of the blade housing 31. In addition, there are embodiments without a blade housing.

[0032] The blade housing 31 is basically movably arranged inside the frame housing 24 and can be moved in the moving direction V ( Figure 7 , Figure 8 ) is guided. Thus, the blade housing 31 can be guided from the Figure 7 The first locking position is transferred to the Fig. 9 In the first locking position, the blade housing 31 is completely located inside the frame housing 24. Figure 8 and Fig. 9 In the second locking position (active position), the blade housing 31 protrudes from the distal end of the frame housing 24.

[0033] The first operating element 34 is used to move the blade housing 31 away from the first locking position and into the Figure 8 and Fig. 9 The first operating element 34 is provided with a second locking position, whereby a pivoting and locking rocker 35 is part of the first operating element 34. This pivoting and locking rocker 35 forms a two-arm lever, the first arm 38 of which is connected to the blade housing 31 in order to transfer the movement on the blade housing 31 in the movement direction V. For this purpose, the arm 38 can be provided with a protrusion 39, which extends into the cavity of the blade housing 31.

[0034] The pivoting and locking rocker arm 35 comprises a second arm 40, on which the first operating element 34 can be held. The operating element 34 is preferably rigidly connected to the pivoting and locking rocker arm 35. Furthermore, one of the arms 38, 40, preferably the arm 40, is provided with a pivoting and moving lock 41, which can be configured, for example, as a cam or a protrusion. It slides during the movement of the pivoting and locking rocker arm 35 in the movement direction V along a locking surface 42, which is arranged such that a pivoting movement of the pivoting and locking rocker arm 35 is blocked. However, the locking surface 42 comprises a cavity 43, which is arranged opposite the pivoting and moving lock 41 if the pivoting and locking rocker arm 35 is positioned in its second locking position, i.e. the distal maximum extended position (active position), as in Figure 8 and Fig. 9 exemplified in .

[0035] Furthermore, the first arm 38 bears a coupling 44 which, through an opening in the blade housing 31, establishes an immovable connection between the first arm 38 and the blade 22 in the movement direction V. For this purpose, the blade 22 comprises, at its location facing the coupling 44, a cavity into which a projection of the arm 38 extends, which projection forms the coupling 44. The blade 22 is thus immovably coupled to the blade housing 31 in the movement direction V by means of the projection 39 and the coupling 44, as long as the pivoting and locking rocker arm 35 is in the non-pivoting position, i.e., as long as the pivoting and moving lock 41 does not extend into the cavity 43 ( Figure 7 , Figure 8 and Fig.11 ).

[0036] In order to operate the blade 22, i.e. to extend it out of the blade housing 31, a second operating element 45 is provided, which is preferably a two-arm lever pivotably supported on the frame housing 24. The pivot axis of the second operating element 45 is preferably oriented transversely to the displacement direction V. The second operating element 45 thus protrudes from the frame housing 24, as specifically at Figures 1 to 3 However, if the knife holder 23 is connected to a leg 14 of the instrument 12, the operating element 45 projects in the direction of the other leg 13 and passes through it due to the lateral deflection if the instrument 12 is closed.

[0037] The lever arm 46 of the second operating element 45 arranged in the frame housing 24 can be connected to the blade 22 by means of a connecting rod 47. For this purpose, the blade 22 includes an extension 22a protruding from the blade housing 31, which is configured as a ramp at its distal end. Supported on this extension 22a is a rod 48, which can be a spring-elastic arm with a forked end that is retained on the frame housing 24. In the forked end of the rod 48, a coupling pin 49 can be positioned to be arranged on the end of the connecting rod 47.

[0038] The pivoting and locking rocker arm 35 supports a transfer mechanism 50 on the distal end of its arm 38. This is achieved by an extension 51 of the arm 38, which extends from the arm 38, adjacent to a coupling cavity 52 formed in the extension 22a, and thus passes through the blade housing 31. As long as the pivoting and locking rocker arm 35 is in the non-pivoted position, i.e. the pivoting and moving lock 41 is not engaged in the cavity 43, the extension prevents the coupling pin 49 from entering the coupling cavity 52. ​​If the lever arm 38 of the pivoting and locking rocker arm 35 is pivoted upwards ( Figure 8 ), the coupler 44 engages in the blade housing and the extension 51 pushes the coupling pin 49 out of the cavity 52. ​​If the lever arm 38 is pivoted downward ( Fig. 9 ), the coupling pin 49 latches into the cavity 52. ​​Thus, the transfer mechanism 50 ensures that the blade 22 is coupled to the first operating element 34 and the blade housing 31, or otherwise coupled to the second operating element 45.

[0039] In addition, the operation lock 53 is used to pivot and lock the rocker arm 35 and temporarily prevent the second operating element 45 from operating. Figure 8 ). The lock is active if the blade housing 31 is in the expanded position, i.e. in the active position. The lock is therefore active as long as the pivoting and locking rocker arm 35 remains coupled to the blade 22. The corresponding protrusion 54 of the pivoting and locking rocker arm 35 releases the path for the protrusion 55 of the second operating element 45 only when the rocker arm 35 is tilted, so that the pivoting and moving lock 41 engages in the cavity 43 and the coupling 44 disengages and the blade 22 is released. This situation is Fig. 9 The connecting rod 47 now establishes a drive connection between the second operating element 45 and the blade 22 , which can then be moved out of the blade housing 31 by means of an operation of the second operating element 45 .

[0040] Furthermore, the second arm 40 is connected to a wedge or cam 56 which is connected to a wedge or cam 57 of the latch member 28. The cams 56 and 57 are positioned so that they come into engagement with the pivoting and locking rocker arm 35 in its proximal extreme position.

[0041] Furthermore, the housing 24 may include an insertion feeler 58, which may be realized as a spring-elastic tongue which is constructed on the housing 24 and protrudes slightly beyond its outer contour. The spring-elastic tongue comprises a bottom end which is movable transversely to the displacement direction V. The bottom end may be configured as a stop block 59, to which a stop surface constructed on the lever arm 40 is assigned. It is arranged so that as long as the insertion feeler 58 is not pushed out of its rest position, the pivoting and locking rocker arm 35 cannot be significantly moved out of the proximal position.

[0042] The operation of the tool holder 23 described so far is as follows:

[0043] Figure 7 The knife holder 23 is illustrated in a delivery condition in which it can be safely handled. The blade 22 is completely retracted into the blade housing 31 and is fixed therein. The blade housing 31 is completely positioned inside the holder housing 24 and locked therein. The first operating element 34 is in the proximal position. Operation of the second operating element 45 does not result in a change of this situation. The blade 22 can neither move out of the blade housing 31 nor can the blade housing 31 move out of the holder housing 24.

[0044] The tool holder 23 can be connected to the instrument 12, whereby the latching member 28 engages with a corresponding latching protrusion 28a which can be configured on the instrument 12. At the same time, an element of the instrument 12 (e.g., a surface provided on the leg 14) slightly pushes the insertion feeler 58 in the direction towards the inside of the holder housing 24, overcoming its spring effect. If the insertion feeler 58 protrudes beyond the contour of the holder housing 24, it is pushed, for example, inside the contour of the holder housing 24. In doing so, the stop block 59 is pushed in the distal direction ( Figure 7 The operator can now move the first operating element 34 in the distal direction. As a result, the blade housing 31 and the blade 22 locked therein move distally away from the frame housing 24 along the movement direction V, as shown in FIG. Figure 8 The blade housing 31 is thus provided in a channel 61 ( Figure 5 ) Move forward inside until clamp 18.

[0045] The passage 61 may extend through the region of the joint 15. It ends at the knife cutout 62 at the jaw 18 and preferably abuts with its front face against the entrance of the knife cutout 62. During the forward movement of the blade housing 31 inside the passage 61, the cutting edge 32 of the blade 22 is located in the blade housing 31 and is protected.

[0046] When the operating element 34 is moved in the distal direction, the pivoting and locking rocker 35 still locks the blade 22 in the blade housing 31. Disengagement of the blade housing 31 and the blade 22 during this process is not possible, because the pivoting and moving lock 41 moves along the locking surface 42 and prevents the pivoting movement of the pivoting and locking rocker 35. Only in the most distal position (i.e. the second locking position of the blade housing 31) is the pivoting and moving lock 41 positioned in front of the cavity 43, as shown in FIG. Figure 8 . The pivoting movement of the pivoting and locking rocker arm 35 is now released. The operator can now press the first operating element 34 towards the frame housing 24 and thereby slightly pivot the pivoting and locking rocker arm 35. Fig. 9 Obviously, the coupling 44 thereby leaves the blade housing 31 and thereby also disengages from the blade 22. Simultaneously, the transfer mechanism 50 releases the coupling cavity 52 so that the coupling pin 49 can enter the coupling cavity 52 of the blade 22. Moreover, the protrusion 54 releases the protrusion 55 so that the second operating element 45 can now be operated, i.e. pivoted, as shown in FIG. Fig.10 exemplified in .

[0047] If the second operating element 45 is operated (pivoted clockwise in the figure), it moves the blade 22 in the movement direction V, i.e., distally away from the blade housing 31, by means of its connecting rod 47. The blade 22 enters the knife cutout 62 and the cutting edge 32 moves along the inside of the knife cutout 62 ( Figure 5). For example, the blade 22 can cut tissue held between the jaws 18, 19. If the blade 22 is sufficiently flexible, the knife cut can be straight or also curved. Preferably, the blade 22 is configured so that the cutting edge 32 is arranged on one side of the convex side (flank) of the knife cut 62.

[0048] If the second operating element 45 is released, the corresponding return spring 63 retracts the operating element 45 back to its rest position. When doing so, the blade 22 is simultaneously retracted back into the blade housing 31 by means of the connecting rod 47. Fig.10 Starting from the situation, in this way again to reach Fig. 9 However, the instrument 12 and the knife holder 23 remain operable. The operating element 45 can be repeatedly operated, whereby the blade 22 is extended and retracted again and again.

[0049] If the tool holder 23 is to be removed from the instrument 12, the second operating element 45 is first released so that Fig. 9 The situation is established. Subsequently, the first operating element 34 is pivoted downwards away from the frame housing 24, so that the coupling 44 engages in the blade housing 31. As a result, the blade 22 is immovably locked inside the still expanding blade housing 31. Now, operation of the second operating element is no longer possible, because the protrusion 54 provided on the pivoting and locking rocker arm 35 blocks the path of the protrusion 55 provided on the second operating element 45. The transfer mechanism 50 thereby lifts the pin 49 of the connecting rod 47 out of the coupling cavity 52. ​​In doing so, the second operating element 45 is now disengaged from the blade 22.

[0050] The first operating element 34 is then moved in the proximal direction, i.e. Figure 8 to the right so that it reaches the Figure 7 The pin 49 of the connecting rod 47 leaves the extension 22a of the blade 22. Due to the pivoting and moving lock 41 moving along the locking surface 42, the pivoting and locking rocker arm 35 cannot pivot, so that the rigid connection between the blade 22 and the blade housing 31 cannot be released.

[0051] If the knife holder 23 is now finally to be released from the instrument 12, the first operating element 34 is pushed in the proximal direction beyond its position in the Figure 7 The proximal end position illustrated in Fig.11 As a result, the cam 56 abuts against the cam 57, so that the latching member 28 is pivoted against the force of the spring 29. The latching device 27 is thus released and the knife holder 23 can be removed from the instrument 12.

[0052] However, in all embodiments of the tool holder 23 without a blade housing 31 , the above description applies correspondingly in the case where the blade housing 31 and, as an option, the projection 39 are also omitted.

[0053] The knife holder 23 according to the invention is provided for use in a surgical instrument 12. The knife holder 23 comprises a blade which can be operated by means of a second operating element 45. The blade 22 is held in a blade housing 31 which can be transferred from a first locking position (passive position) to a second locking position (active position) by means of a first operating element 34. In the passive position, the blade housing 31 is completely located inside the holder housing 24 and the blade 22 is locked therein. In the active position, the blade housing 31 protrudes out of the holder housing. Only in the active position can the locking between the blade housing 31 and the blade 22 be released, whereby also only then a drive connection is established between the second operating element and the blade 22.

[0054] Since the blade 22 is retained within the blade housing 31, the rest of the tissue entrained during the retraction of the blade from the tissue is received and enclosed within the blade housing 31. Cleaning and reuse of the instrument 12 is thus simpler and safer.

[0055] Reference Mark:

[0056] 12 Instruments

[0057] 13, 14 Legs

[0058] 15 Connector

[0059] 16, 17 handles

[0060] 18, 19 Clamp

[0061] 20, 21 facing surfaces of the clamps 18, 19

[0062] 22 Blades

[0063] 22a Extension

[0064] 23 Tool holder

[0065] 24 rack housing

[0066] 25 Connection structure

[0067] 26 Transverse grooves

[0068] 27 Latch Device

[0069] 28 Latch assembly

[0070] 29 Spring components

[0071] 30 Bearings

[0072] 31 Blade housing

[0073] 32 cutting edges

[0074] 33 Lateral surface

[0075] V Moving direction

[0076] 34 First operating element

[0077] 35 Pivoting and locking rocker arm

[0078] 36 Rotation pin

[0079] 37 slots

[0080] 38 Pivoting and locking the first arm of the rocker arm 35

[0081] 39 protrusion

[0082] 40 Pivoting and locking the second arm of the rocker arm 35

[0083] 41 Pivoting and moving locks

[0084] 42 Locking surface

[0085] 43 cavity

[0086] 44 Connector

[0087] 45 Second operating element

[0088] 46 Lever Arm

[0089] 47 Connecting rod

[0090] 48 sticks

[0091] 49 Connecting pin

[0092] 50 Transfer Agency

[0093] 51 Extension of lever arm 38

[0094] 52 Connection cavity

[0095] 53 Operation lock

[0096] 54 Protrusion for pivoting and locking the rocker arm 35

[0097] 55 Protrusion of the second operating element 45

[0098] 56 Cam for pivoting and locking the rocker arm

[0099] 57 Cam of latch member 28

[0100] 58 Insert the probe

[0101] 59 Stop block

[0102] 60 Stop surface

[0103] 61 channels

[0104] 62 Knife cut

[0105] 63 Return spring

Claims

1. A tool holder (23) for a surgical instrument (12), A frame housing (24) configured to be connectable to the surgical instrument (12) is provided. A blade housing (31) is movably supported inside the frame housing (24), A blade (22) is movably supported inside the blade housing (31), having a first operating element (34) for moving the blade housing (31), and having a second operating element (45) for moving the blade (22) inside the blade housing (31); in, The blade housing (31) comprises a first locked position in which the blade housing (31) is completely positioned inside the frame housing (24); wherein the blade housing (31) comprises a second locking position, in which the blade housing is maintained to partially protrude from the frame housing (24); Wherein, during the movement of the blade housing from the first locking position to the second locking position, the blade is fixedly connected to the blade housing.

2. The tool holder according to claim 1, characterized in that: The carrier housing (24) includes a latching device (27) for releasably connecting the carrier housing (24) to the surgical instrument (12).

3. The tool holder according to claim 2, characterized in that: The latching device (27) is operable by means of the first operating element (34).

4. The tool holder according to any one of claims 1 to 3, characterized in that The blade (22) includes a retracted position in which the blade (22) is completely positioned and locked inside the blade housing (31).

5. The tool holder according to any one of claims 1 to 3, characterized in that The blade (22) comprises an extension portion (22a) which is capable of extending away from the blade housing (31).

6. The tool holder according to any one of claims 1 to 3, characterized in that The first operating element (34) is movably mounted on the carrier housing (24).

7. The tool holder according to any one of claims 1 to 3, characterized in that The first operating element (34) is supported on the frame housing (24) along a predetermined movement path.

8. The tool holder according to claim 7, characterized in that: A pivot lock is effective between the first operating element (34) and the housing housing (24), the pivot lock being configured to allow a pivoting movement of the first operating element (34) only in an end position of the movement path.

9. The tool holder according to any one of claims 1 to 3, characterized in that The first operating element (34) comprises a coupling (44) for connecting with the blade housing (31).

10. The tool holder according to any one of claims 1 to 3, characterized in that The first operating element (34) and the second operating element (45) can be alternately coupled to the blade (22) by means of a transfer mechanism (50).

11. The tool holder according to any one of claims 1 to 3, characterized in that The second operating element (45) can be operatively coupled to the blade (22) by pivoting movement of the first operating element (34).

12. The tool holder according to any one of claims 1 to 3, characterized in that An operating lock is effective between the first operating element (34) and the second operating element (45).

13. The tool holder according to any one of claims 1 to 3, characterized in that An insertion feeler (58) is assigned to the first operating element (34), the insertion feeler being designed to lock the operation of the first operating element (34) outside the surgical instrument (12).

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