DE202018006303U1 - shaft instrument - Google Patents

Abstract

Shank instrument for a handle (5) with a cutting mouth (1), an inner tube (8) and an outer tube (9), the inner tube (8) forming a suction channel (17), characterized in that the inner tube (8) has a pressure compensation opening (10) includes.

Description

Technical field

The invention relates to a shaft instrument with a cutting mouth for medical applications according to the preamble of claim 1.

State of the art

In the medical or surgical field, devices for severing, punching and removing tissue and tissue parts, in particular from a body of a living being, are already known and used in a variety of forms and configurations. From the DE 20 2009 002 433 U1 For example, a surgical instrument is known, which is also referred to as a sliding shaft instrument and has the task of separating body tissue, cartilage or the like by means of a punching function. The problem here, however, is that the tissue separated in this way is not automatically removed and remains in the area of the punch. In addition, the application of increased force by the user is required for the punching process, which can result in the necessary precision in the application being reduced. There is also a risk of injuring other tissues.

From the DE 10 2015 112 716 A1 discloses a device for separating and removing tissue parts with respect to the problem of the removal of separated tissue. A suction channel is included in the instrument, which allows the separated tissue to be removed by a volume flow. In addition, a rinsing function is provided, the liquid supplied being intended to improve the removal of the separated tissue through the suction channel. The disadvantage here is that the suction function can only take place if the punch provided for separating the tissue is open, since otherwise the prevailing negative pressure in the suction channel or in the area of the punch makes suction impossible. Furthermore, there is the disadvantage that the suction function frequently pulls tissue into the area of the punch which is not intended to be separated, removed or removed. This problem makes application difficult and can result in unwanted tissue separation or injury during a medical / surgical procedure.

Object of the invention

The object of the present invention is to overcome the disadvantages of the prior art. In particular, a device is to be provided which prevents tissue from being inadvertently sucked in. Furthermore, a comprehensive suction function should also be possible with the punching or cutting device closed. In addition, the precision in handling the device is to be improved.

Solution of the task

The features according to claim 1 lead to the achievement of the object.

Advantageous refinements are described in the subclaims.

The shaft instrument according to the invention is a medical or surgical device for cutting and removing tissue and tissue parts, in particular from a body of a living being. The shaft instrument is pin-shaped and oval in cross-section and is inserted into a handle for use and brought into operative connection with it. After use or after the medical or surgical intervention, the shaft instrument is separated from the handle again. This modular structure brings advantages in particular in the area of sterilization, material saving and handling.

Depending on the design variant, the handle is provided either as a so-called disposable handle, which is disposed of after its use, or as a classic handle, which can be used again after use and medical sterilization.

In a further embodiment it is provided that the shaft instrument is firmly connected to the handle. In this one-piece embodiment, two variants are also provided. The first variant is designed in such a way that it can be sterilized after use and then used again. This variant consists largely of correspondingly durable materials, such as suitable metals.

The second one-piece variant is a holistic one-way variant, in which the shaft instrument firmly connected to the handle largely consists of plastics and is disposed of after the first use.

The provision of these different disposable and reusable applications makes it possible to provide the shaft instrument according to the invention for a wide variety of medical requirements and areas of application, which is why it can be easily included in the individually available instrument selection.

The shaft instrument according to the invention has a distal end and a proximal end. A cutting mouth is arranged in the region of the distal end of the shaft instrument. A recess and a connection are arranged in the region of the proximal end.

The shaft instrument according to the invention has an outer tube and an inner tube arranged therein. Both the outer tube and the inner tube each have a cone, on which the shaft instrument tapers in the direction of a distal end of the shaft instrument.

A rail emerges from the outer tube in the region of the distal end of the shaft instrument according to the invention. The outer tube is connected to a mouth tip via this rail.

The outer tube also has the recess in a region at a proximal end of the shaft instrument. This recess releases part of the inner tube movably arranged in the outer tube.

The inner tube is movably arranged in the outer tube and forms a suction channel. The suction channel of the inner tube accordingly begins at a cutting edge and ends at a connection. The connection is connected in the direction of the distal end to the inner tube or a suction channel and can be operatively connected to the connection element in the proximal direction by inserting it into the handle. A suction function is made possible via the connection element of the handle by establishing a connection to an external medical pump. This suction function is based on a volume flow which develops its suction effect in the area of the cutting mouth and in the suction channel of the inner tube. All tissue parts cut through the cutting mouth are to be suctioned off. Furthermore, a flushing function is integrated in the connection element of the handle, which allows liquids, for example water, to be introduced into the inner tube or the suction channel in order to improve the suction function within the suction channel.

In the area of the recess of the outer tube, the inner tube has at least one pin bearing and a pin arranged therein. The movement of the inner tube within the outer tube is carried out via this pin by means of a coupling in the form of a U-profile of the handle. In preferred exemplary embodiments, two opposing bolt layers or two opposing bolts are preferably arranged in the region of the recess on the inner tube. Here, of course, other coupling solutions are also possible and provided, which make it possible to move the inner tube within the outer tube and over the recess by actuating the handle.

A connection to a connection element in the interior of the handle is established via the connection of the inner tube.

The inner tube has pressure equalization openings in the region of the distal end of the shaft instrument. These pressure compensation openings pass through the inner tube and are therefore in operative connection with the suction channel.

In the present exemplary embodiment, two times eight pressure equalization openings are included on the inner tube, eight being arranged on each side in the region of the distal end in a uniform and offset pattern. In the preferred exemplary embodiment, each pressure compensation opening is of the same size and is designed and arranged in the form of an elongated hole, the longitudinal side of the elongated pressure compensation openings being oriented in the distal / proximal direction, that is to say in the longitudinal direction of the shaft instrument. Of course, other designs and arrangements are also possible according to the invention, and the number of pressure equalization openings is variable.

At a distance from the pressure equalization openings, this distance can vary from embodiment to embodiment, a cutting edge is attached to the distal end of the inner tube. This cutting edge is shaped like a horseshoe and is sharpened on a cutting surface in accordance with the medical-surgical application of the shaft instrument. The open area of the horseshoe-shaped cutting edge is guided in a guide rail. This guide rail is arranged on the rail which in turn emerges from the outer tube.

The guide rail, in conjunction with the rail, enables the cutting edge or the inner tube to be precisely aligned with a counter-cutting piece, which likewise has a horseshoe shape. The counter-cutting piece is arranged on the side of the jaw tip which is directed in the direction of the proximal end of the shaft instrument. Both the cutting edge and the counter-cutting piece comprise sharp cutting surfaces or cutting edges suitable for medical applications.

The cutting jaw is through the end of the inner tube with the pressure equalization openings and the cutting edge and the end of the outer tube, which forms the guide rail with the rail for the cutting edge and the jaw tip with the counter-cutting piece.

If the inner tube is moved within the outer tube in the direction of the distal end of the shaft instrument, that is to say in the direction of the mouth tip, the cutting mouth closes. This movement takes place by actuating a lever on the handle which is operatively connected to the bolts of the inner tube via a coupling in the form of a U-profile.

The cutting edge overlaps the counter-cutting piece in the closed position. This overarching process, which represents the actual cutting process of the shaft instrument according to the invention, is to be compared with the scissors principle. With the scissors principle, the two scissor blades always only point directly at one another with their cutting edges, which creates the cutting effect. The same cutting effect occurs when the counter-cutting piece reaches over the cutting edge. For this purpose, the cutting edge and the counter-cutting piece have a special cutting geometry to each other. This cutting geometry relates to an angular position of the cutting edge with respect to the counter-cutting piece or its cutting surfaces or cutting edges with respect to one another. In preferred exemplary embodiments, this angle is 20 degrees. Of course, deviations are also possible and provided here, as long as the described effect is retained. This is particularly the case when it comes to embodiments in different sizes of the shaft instrument.

Due to the scissors principle and the cutting geometry of the cutting edge in connection with the counter-cutting piece, it is advantageously achieved that the cutting force to be used is significantly reduced. In addition, compared to conventional punches, this cutting geometry enables a fine and clean cut, which causes a minimum of injury and does not result in any crushing or tearing of tissue.

The cutting jaw is in an open position when not in use, the cutting edge and the counter-cutting piece not being in contact. In this rest position, at least two of the pressure compensation openings included on the inner tube are exposed and are not covered or closed by the outer tube. These exposed pressure equalization openings advantageously prevent tissue from being sucked into the cutting mouth unintentionally before a cutting operation, since the volume flow at the cutting mouth is reduced by the two exposed pressure equalization openings. This volume flow reduction caused by the exposed pressure equalization openings means that only tissue that is in the immediate vicinity of the cutting jaw is sucked in. In addition, the exposed pressure equalization openings also make it possible to remove the cutting jaw from the tissue that may have already been sucked in, even without a cut being made, without injuries being caused by the suction and the renewed detachment.

Another significant advantage is that the cutting mouth does not have to be opened again immediately after a cut has been made, as is the case with other instruments known from the prior art with a punching and suction function. There, the punching mouth has to be opened so that air can flow in to compensate for the negative pressure created by the suction function, so that the punched-out tissue can be transported away with the volume flow.

In the shaft instrument according to the invention, all of the pressure compensation openings which are included on the inner tube and which are in operative connection with the suction channel are exposed in the position of the closed cutting mouth, ie directly after the cut, and are not covered or closed by the outer tube. This allows the cut tissue to be transported away through the suction channel in the direction of the proximal end of the sheep instrument and takes place even before the cutting mouth has been opened again. On the one hand, a further risk of injury to adjacent tissue is minimized by the fact that the cutting mouth can be kept shot. On the other hand, a new cutting process is possible immediately after opening the cutting mouth, since the cut tissue could already be transported through the exposed pressure compensation openings through the suction channel in the closed position of the cutting mouth.

Of course, the cutting mouth is opened automatically by a spring included in the handle, so that the pins of the inner tube are moved again in the direction of the proximal end of the shaft instrument via the coupling in the form of a U-profile.

list of figures

• 1 eine Seitenansicht eines erfindungsgemässen Schaftinstruments mit geöffnetem Schneidmaul und einem Handgriff;
• 2 eine Seitenansicht des Schaftinstruments nach 1 mit teilweise geschlossenem Schneidmaul;
• 3 eine Schnittansicht entlang der Längsachse des Schaftinstruments nach 2;
• 4 eine vergrössert dargestellte Ansicht eines distalen Endes des Schaftinstruments gemäss 1;
• 5 eine vergrössert dargestellte Ansicht des distalen Endes des Schaftinstruments nach 5 mit geschlossenem Schneidmaul;
• 6 eine vergrössert dargestellte Ansicht des distalen Endes des Schaftinstruments gemäss 1 und 4 mit Winkelangaben zur Schneidgeometrie.

Further advantages, features and details of the invention emerge from the following description of preferred exemplary embodiments and with reference to the drawings; these show in:

• 1 a side view of an inventive shaft instrument with an open cutting mouth and a handle;
• 2 a side view of the shaft instrument after 1 with partially closed cutting mouth;
• 3 a sectional view along the longitudinal axis of the shaft instrument 2 ;
• 4 an enlarged view of a distal end of the shaft instrument according to 1 ;
• 5 an enlarged view of the distal end of the shaft instrument 5 with closed cutting mouth;
• 6 an enlarged view of the distal end of the shaft instrument according to 1 and 4 with angle information on the cutting geometry.

embodiment

In 1 is a shaft instrument according to the invention S shown. With the shaft instrument S is a schematically illustrated handle 5 with a lever 13 and a connector 15 shown.

The shaft instrument according to the invention S includes an outer tube 9 and an inner tube 8th and has a pin-shaped basic shape with an oval cross section. With an oval cross section it is meant that a height H1 and a height H2 are longer than a corresponding width of the oval cross section, which is not visible due to the illustration. Furthermore, the shaft instrument according to the invention has S a distal end D and a proximal end P (please refer 2 ) with the distal end D a cutting mouth 1 includes and the proximal end P for inclusion in the handle 5 suitable is. The shaft instrument according to the invention S or the outer tube 9 and accordingly the inner tube 8th tapers towards the distal end D of the shaft instrument S in an area called a cone 14.1 of the outer tube 9 is trained.

The cutting mouth 1 is through a section of the outer tube 9 with a recess 21 at the distal end D of the shaft instrument S as well as that in the outer tube 9 guided inner tube 8th shaped. The area of the outer tube 9 with the recess 21 is thickened. In the 1 is the inner tube 8th only partially in the area of the recess 21 of the outer tube 9 to see. The outer tube 9 and the inner tube 8th are in a rest position or a starting position. The cutting mouth 1 is opened.

In 2 is the shaft instrument according to the invention S without the handle 5 shown creating a connection 6 of the inner tube 8th at the proximal end P of the shaft instrument S can be seen. Via this connection 6 can connect to the connector 15 inside the handle 5 getting produced. The connection 6 stands in the direction of the distal end D of the shaft instrument S with the inner tube 8th or a suction channel 17 of the shaft instrument S in connection and can be inserted into the handle 5 towards the proximal end P of the shaft instrument S with the connection element 15 be connected. Via the connection element 15 of the handle 5 a suction function is enabled by connecting to an external medical pump. There is also a flushing function in the connection element 15 integrated, which allows liquids, such as water, in the inner tube 8th or the suction channel 17 initiate in order to improve the suction function.

In the area of the proximal end P of the shaft instrument S has the outer tube 9 a recess 20 on. This recess 20 gives part of the inner tube 8th free. In this released area of the inner tube 8th are two opposite pin bearings 18 arranged. One of these pin bearings 18 is in 3 further visible. In these pin bearings 18 is a bolt each 19 arranged or a through bolt, which would however mean that the through bolt an interior of the inner tube 8th would have to cross. With the bolts 19 is the lever 13 movably connected via a U-profile, not shown. By operating the lever 13 towards the handle 5 the bolts are actuated 19 in the pin bearings 18 and thus a shift in the inner tube 8th to the outer tube 9 so that the cutting mouth 1 can be opened or closed. This possible shifting movement is indicated by the arrow F indicated. Of course, this sliding movement of the inner tube takes place 8th from the proximal end P of the shaft instrument S towards the distal end D of the shaft instrument S and vice versa.

In the handle 5 is a spring mechanism, not shown, which causes the lever 13 is moved to its rest position as soon as you press the lever 13 to close the cutting mouth 1 subsides. That means the lever 13 only needs to be operated for the cutting process.

The cutting mouth 1 is in 2 almost closed, which is why the area of the inner tube 8th in which the opposite bolts 19 are arranged in a front, ie the distal end D of the shaft instrument S facing area of the recess 20 located. Would be the shaft instrument according to the invention S in its rest position with the cutting jaw open 1 , the bolts would 19 in a rear area of the recess 20 are located, ie in the area of the recess 20 which is the proximal end P of the shaft instrument S is facing.

So that the cutting mouth 1 the almost closed position can be the inner tube 8th thus, as described above, in relation to the outer tube 9 towards the distal end D of the shaft instrument S or in the direction of the cutting mouth 1 been postponed.

At the distal end D of the shaft instrument S facing section 22 of the inner tube 8th is only semi-oval and therefore runs in a kind of arc in the outer tube 9 or via the recess 21 of the outer tube 9 , The section is led 22 of the inner tube 8th thereby in guide rails 3 that are in a rail 12 which are made in one piece from the outer tube 9 emerges, are integrated.

The section 22 of the inner tube 8th forms towards a muzzle 16 a cutting edge 2 out. The guide rails 3 enable in connection with the rail 12 an exact alignment of the cutting edge 2 on a counter cutting piece 4 which is on the side of the mouth tip 16 is arranged in the direction of the proximal end P of the shaft instrument S is directed. Both the cutting edge 2 as well as the counter cutting piece 4 are designed as a sharp cutting edge suitable for medical applications.

One towards the proximal end P of the shaft instrument S level of the rail 12 of the outer tube 9 serves inside the outer tube 9 as a stop 23 for a stop edge 24 of the inner tube 8th ,

The section 22 of the inner tube 8th still has numerous pressure equalization openings 10 on. The pressure equalization openings 10 serve the air entry, even when the cutting jaw 1 is still closed in itself. The pressure equalization openings 10 reach through the inner tube 8th , In the present exemplary embodiment, there are two times eight pressure equalization openings 10 comprises, with eight per long side of the section 22 of the inner tube 8th are arranged in a uniform and staggered pattern. Every pressure equalization opening 10 is in the present and preferred embodiment of the same size and executed and arranged in the form of an elongated hole. The long side of the elongated pressure equalization openings 10 is in the distal / proximal direction, i.e. in the longitudinal direction of the shaft instrument S , aligned. Of course, other configurations and arrangements are also possible according to the invention, as is the number of pressure equalization openings 10 variable.

The pressure equalization openings 10 are with the cutting jaw closed 1 , so if the inner tube 8th in the outer tube 9 completely towards the distal end D of the shaft instrument S has been moved in the area of the recess 21 to recognize, however, do not reach directly to the cutting edge 2 approach. Of course, this arrangement can also be used in different embodiments of the shaft instrument according to the invention S vary.

In 3 is the shaft instrument according to the invention S shown in a longitudinal section. Here is the inner tube 8th and the outer tube 9 can be seen, both the cone 14.1 of the outer tube 9 as well as a cone 14.2 of the inner tube 8th are evident. Here is the cone 14.2 of the inner tube 8th in terms of the tapered shape more pronounced than the cone 14.1 of the outer tube 9 , The cone 14.1 can thus serve as a limitation of movement, so that the cone 14.2 or the inner tube 8th no further in the outer tube 9 can be moved as required.

The inner tube 8th also forms the suction channel 17 which at the cutting edge 2 starts connecting 6 ends. The pressure equalization openings 10 stand with the suction channel 17 in operative connection.

Furthermore, the recess 20 of the outer tube 9 and one of the pin bearings 18 in the inner tube 8th seen.

In 4 is an enlarged view of the distal end D of the shaft instrument according to the invention S seen. The cutting mouth 1 is in an open position, which is the position when not in use, i.e. represents a rest position. It can be seen that at least two of those on the section 22 of the inner tube 8th included pressure equalization openings 10 be exposed and not through the outer tube 9 are covered or closed. Through these exposed pressure equalization openings 10 prevents unwanted tissue from entering the cutting jaw before a cutting process 1 is sucked because the volume flow at the cutting jaw 1 through the two exposed pressure equalization openings 10 is reduced.

The rails are also in this rest position 12 and guide rails 3 apparent through which the section 22 of the inner tube and thus the cutting edge 2 a perfect fit on the counter cutting piece 4 the mouth tip 16 to be led.

In 5 is an enlarged view of the distal end D of the shaft instrument according to the invention S with closed cutting mouth 1 shown. Here you can see that the cutting edge 2 in the closed position the counter cutting piece 4 overlaps. This overarching process, which represents the actual cutting process, can be compared to the scissors principle, in which the two scissor blades with their cutting edges only drive directly alongside each other at certain points, which creates the cutting effect. The same cutting effect is achieved by reaching over the counter cutting piece 4 through the cutting edge 2 ,

In 6 is a so-called cutting geometry of the shaft instrument according to the invention S or the cutting piece 2 and the counter cutting piece 4 shown in their operative connection to each other. In this regard, there are three angles, namely α . β and γ shown. The angle α is preferably 20 degrees and describes the cutting geometry of the cutting piece 1 to the counter cutting piece 4 , The angle β describes the slope of the cutting edge of the counter-cutting piece 4 , this angle β is preferably 15 degrees. The angle γ describes the slope of the cutting edge 2 , this angle γ is preferably 35 degrees. Of course, these degrees are related to the angles α . β and γ to a preferred exemplary embodiment according to the invention, however, may vary in further exemplary embodiments, in particular in exemplary embodiments which differ in their size.

This cutting geometry enables the cut not to be made over the entire length of the opposing cutting surfaces or cutting the cutting edge 2 and the counter cutting piece 4 takes place, but always only selectively according to the above scissor principle. This reduces the cutting force to be used and enables a fine and clean cut with minimal necessary injury.

Otherwise, the explanations for the figures apply 1 . 2 and 3 also to the 4 . 5 and 6 , This applies in particular if the same features have been provided with the same reference numbers. A repetition of all the features already described in the first figures is therefore omitted.

• Um das erfindungsgemässe Schaftinstrument S verwenden zu können, wird es über die Bolzen 19 im Bereich der Ausnehmung 20 und dem Anschluss 6 am proximalen Ende P des Schaftinstrumentes S mit dem Handgriff 5 und dem Anschlusselement 15 in Wirkverbindung gebracht. Hier kommen unterschiedliche Handgriffe nach Typus des Handgriffs 5 in Frage. Diese können beispielsweise aus Metall gefertigt sein und nach einer Sterilisation erneut verwendet werde; es könne jedoch auch entsprechend geeignete Handgriffe sein, die aus Kunststoffen bestehen und nur für einen medizinischen Eingriff vorgesehen sind und danach zur Wiederverwertung gegeben werden.

Referring to the 1 to 6 the mode of operation of the device according to the invention is explained as follows:

• To the shaft instrument according to the invention S To be able to use it, it is about the bolts 19 in the area of the recess 20 and the connection 6 at the proximal end P of the shaft instrument S with the handle 5 and the connecting element 15 brought into active connection. Here are different handles according to the type of handle 5 in question. These can be made of metal, for example, and reused after sterilization; However, it could also be suitable handles which are made of plastics and are only intended for medical intervention and are then given for recycling.

With the connection element 15 of the handle 5 a connection to an external medical pump is established via a hose, which is used for a volume flow along the suction channel 17 from the area of the cutting mouth 1 towards the proximal end P of the shaft instrument S provides. At the same time, the connection element 15 a liquid, for example water, in the suction channel 17 initiated, which significantly improves the suction function.

With a conventional shaft instrument, there would now be a constant risk during a medical intervention due to the volume flow present that tissue would be unintentionally sucked into the area of a punching mouth and there, for example, would be injured by large blades or sharp-edged punching. To solve this problem, the present shaft instrument according to the invention comprises S the pressure equalization openings 10 that with the suction channel 17 are in operative connection. From the enclosed pressure equalization openings 10 that on the section 22 of the inner tube 8th are arranged, is a part in the rest position of the cutting mouth 1 , i.e. in the open position of the cutting mouth 1 , not from the outer tube 9 closed or covered. The pressure equalization openings exposed in this rest position 10 reduce by their connection to the suction channel 17 the volume flow in the area of the cutting mouth 1 , This reduction in the volume flow leads to the risk of inadvertent suction of tissue into the cutting mouth 1 is significantly reduced or largely excluded.

Once the tissue to be separated or cut off has been located and reached, the cutting jaw can 1 of the shaft instrument according to the invention S be guided to the tissue. By operating the lever 13 of the handle 5 then becomes the inner tube 8th in the outer tube 9 towards the distal end of the shaft instrument S moves and so the cutting mouth 1 closed. At the same time, the cutting edge 2 according to the principle of scissor cutting over the counter cutting piece 4 emotional. The cutting mouth 1 is then at this moment in a closed position, which in 5 can be seen, the cutting edge 1 the counter cutting piece 4 overlaps.

The cut tissue is within the section shortly after cutting 22 of the inner tube 8th in the area of the pressure equalization openings 10 , Through the Pressure relief openings 10 can despite the closed cutting mouth 1 Air sucked in and thus the cut tissue in the direction of the suction channel 17 or in the direction of the proximal end P of the shaft instrument S This is done even though the cutting mouth is still closed, which in the present exemplary embodiment is only due to the pressure equalization openings included 10 can be done. In the case of a conventional shaft instrument, a corresponding suction would only take place after a punching mouth had been opened again, since previously a negative pressure building up within a suction channel would not have made it possible to extract the punched-out tissue.

Will the lever 13 of the handle 5 relieved again, the cutting jaw opens 1 , whereby the still exposed pressure equalization openings in turn prevents other and in particular unwanted tissue from entering the area of the cutting mouth 1 is sucked in.

Although only a preferred embodiment of the invention has been described and illustrated, it will be apparent that those skilled in the art can add numerous modifications without departing from the spirit and scope of the invention. In particular, variations in the size of individual shaft instruments according to the invention are provided, the cutting geometry in particular also being able to change, which can lead to deviating angular masses. Furthermore, the number, shape and arrangement of the pressure equalization openings included can of course also vary.

LIST OF REFERENCE NUMBERS

1

cutting mouth

2

cutting edge

3

guide rail

4

Against cutting piece

5

handle

6

connection

7

8th

inner tube

9

outer tube

10

Pressure relief openings

11

12

rail

13

lever

14th

cone

15

connecting element

16

Maul tip

17

suction

18

pin bearing

19

bolt

20

recess

21

recess

22

section

23

attack

24

stop edge

S

shaft instrument

H1

height

H2

height

D

distal end

P

proximal end

F

arrow

α,

angle

β

angle

γ

angle

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 202009002433 U1 [0002]
• DE 102015112716 A1 [0003]

Claims (8)

Shaft instrument for a handle (5) with a cutting jaw (1), an inner tube (8) and an outer tube (9), the inner tube (8) forming a suction channel (17), characterized in that the inner tube (8) has a pressure compensation opening (10) includes. Shaft instrument after Claim 1 , characterized in that the pressure compensation opening (10) can be brought into operative connection with the suction channel (17) Shaft instrument after Claim 1 or 2 , characterized in that the cutting jaw (1) is formed by a section of the outer tube (9) with a recess (21) and the inner tube (8). Shank instrument according to one of the preceding claims, characterized in that the inner tube (8) is arranged movably within the outer tube (9). Shank instrument according to one of the preceding claims, characterized in that a cutting edge (2) emerges from the inner tube (8). Shaft instrument after Claim 3 , characterized in that the cutting edge (2) interacts with a counter-cutting piece (4) according to the scissors principle. Shaft instrument after Claim 5 or 6 , characterized in that an angle (α) to the cutting geometry between the cutting edge (1) and the counter-cutting piece (4) is preferably 20 degrees. Shaft instrument after Claim 1 , characterized in that a rail (12) with a guide rail (3) for guiding the inner tube (8) in the area of the cutting jaw (1) emerges from the outer tube (9) and establishes a connection to a jaw tip (16).

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