DE202013100878U1 - arthroscopy shaft - Google Patents

Abstract

Shaft tube, in particular a Arthroskopieschaft (1), with a connectable plastic shaft (2), characterized by a metal sleeve (3), wherein the metal sleeve (3) comprises the Arthroskopieschaft (1), suitable for supporting stabilization of the connectable plastic shaft (2).

Description

The invention relates to a shaft tube for a medical instrument according to the preamble of claim 1.

State of the art

Various shaft tubes for medical instruments are known and commonly used in the prior art. In this context, on the EP 1 269 925 A1 which discloses an access cannula for endoscopic surgery.

Next will be on the DE 9404297 U1 which discloses a collapsible tubular shaft instrument for intervention in the field of arthroscopy.

In a sense, the known art is divided into two systems.

The first system consists of a fixed non-detachable connection between the main part and the shaft tube. This design is preferably completely executed in stainless steel. The disadvantage here is that the system can be damaged during surgery by other instruments used, such as a shaver blade in the operation. Due to the firmly connected components, the complete system can no longer be used in the event of severe damage.

The second system consists of a main part and a detachable shaft tube, which consists of stainless steel or plastic. The disadvantage here again is that on the one hand, a pure unreinforced plastic stem tube has too great an instability and, on the other hand, the metal abrasions produced in contact with another instrument are very difficult to remove from the body again.

Object of the invention

The object of the invention is to provide a medical instrument which combines the advantages of a connectable plastic shaft with the stability of the metal shanks.

Solution of the task

To solve the problem lead the features of claim 1.

The invention relates to a medical instrument. In particular, an arthroscopic shaft is meant. This Arthroskopieschaft has a connectable plastic shaft. The inventive feature is the fact that a metal sleeve is present. The arthroscopic shaft comprises the metal sleeve. This metal sleeve can be connected in one piece or connectable with the arthroscopic shaft. The connective plastic shaft can be pulled over the arthroscopic shaft. The dimensions and the design are to be coordinated accordingly. The metal sleeve advantageously serves to provide supportive stabilization of the connectable plastic shaft when the connectable plastic shaft has been pulled and secured over the arthroscopic shaft.

For this purpose, the metal sleeve refers only to a part of the length of the connectable plastic shank. In this way, a non-contact area between the metal sleeve and the connectable plastic shaft is formed at a distal end of the connectable plastic shaft. As a non-contact area is any area in which a distance between the distal end of the connectable plastic shaft and the likewise distal end of the metal sleeve is formed.

Consequently, the medical instrument according to the invention consists of two main components. On the one hand from the Arthroskopieschaft with integrally formed metal sleeve, which does not depend on the details of Arthroskopieschafts here. The second main component is the connectable shaft tube. The connectable shaft tube is made of plastic. The shape and composition of the plastic, as well as the selection of the individual components of the plastic is incumbent on the skilled person, who will make an appropriate selection of the materials in view of the actual requirements of the medical instrument.

Advantageously, it is advantageously achieved at the contactless region between the distal end of the connectable plastic shaft and the distal end of the metal sleeve that no metal abrasions can occur. Plastic abrasions can easily be rinsed out of the body as plastic is usually lighter than metal. However, the plastic shaft tube receives the necessary stability by a metal sleeve attached to the arthroscopy shaft. The non-contact area is also referred to below as a specific distance. It is important in this context, in particular, that the metal sleeve ends in front of the distal end of the connectable plastic shaft, so that no metal abrasion can occur in contact with another surgical instrument.

In another embodiment, the plastic shaft may also consist entirely or only partially of plastic. It is also conceivable that a part of the plastic shaft for stabilization Metal is produced. This can be done, for example, by pulling metal threads or metal nets into the plastic shank. In addition, it is also possible to use glass fiber reinforced plastic. These points serve to stabilize the plastic sleeve.

Basically, the connectable plastic shaft is to be designed such that it can be pulled over the metal sleeve. Subsequently, the connectable plastic shaft is connected by a fixing mechanism with the arthroscopic shaft or fixed to the arthroscopic shaft. This is the safe way to work with the medical instrument.

An exemplary embodiment of a fixing mechanism is preferably to provide a union nut, wherein the union nut pulls over a connectable plastic shaft and can be tightened on the arthroscopic shaft, so that the connectable plastic shaft is connected to the arthroscopic shaft. The connection can follow here either via a clamping or actually via a positive pressing together of the plastic shaft with the Arthroskopieschaft. It can also be provided that the union nut is not lost but movable on the outer circumference of the plastic shaft is located. In this way, for example, would advantageously achieved that the nut can not be lost and when using a quick and easy determination of the Arthroskopieschaft is possible. As an alternative to the union nut, for example, it is also possible to use a bayonet connection or a self-tightening closure

Next, the connectable plastic shaft on a first positive locking element. This first positive locking element is in connection with a second positive locking element of the arthroscopic shaft. In this case, the number of the first positive locking element or the second positive locking element is arbitrarily expandable. In this context, the operative connection means that the first positive locking element and the second positive locking element can be positively connected to one another. In another embodiment, this positive connection can also be designed self-centering. This can be done, for example, by flattened areas and the first positive locking element and the second positive locking element, so that when the plastic shaft is placed on the arthroscopic shaft, it automatically moves into the preferred position.

In the context of the embodiments of the invention, it is irrelevant whether the plastic shaft is connected to the Arthroskopieschaft in general or with the metal sleeve in particular or is connected. Since the metal sleeve is usually formed integrally with the arthroscopic shaft, it does not matter to which part the connection between the connectable plastic shaft and the Arthroskopieschaft arise.

figure description

Further advantages, details and features of the invention will become apparent from the following description of various figures of an inventive embodiment. These show in detail

1 a side view of various components of a medical instrument according to the invention in non-use position;

2 a sectional side view of another embodiment of the invention for a medical instrument in the use position.

Further in 1 a medical instrument according to the invention is shown in non-use position. The medical instrument consists of an arthroscopic shaft 1 , At the arthroscopy shaft 1 is a metal sleeve 3 educated. In addition, between the metal sleeve 3 and the arthroscopy shaft 1 a second positive locking element 8th to recognize. Moreover, in 1 a plastic shaft 2 shown, with the plastic shaft 2 a distal end 6 and a first positive locking element 7 having. The plastic shaft 2 is designed so that it on the metal sleeve 3 can be pulled. The first positive locking element go thereby 7 and the second positive locking element 8th a positive connection with each other. In addition, the first positive locking element 7 and the second positive locking element 8th einverdrehfest positively connected. Subsequently, a union nut 4 over the plastic shaft 2 pulled and with the Arthroskopiesschaft 1 connected.

The metal sleeve 3 is in 1 about half as long as the plastic shaft 2 ,

In 2 is also an arthroscopy shaft 1 shown, but with the metal sleeve 3 and the plastic shaft 2 with the help of the union nut 4 already firmly connected. In 2 is a partially sectioned side view. There you can see how between the distal end 6 of the plastic shaft 2 and the unspecified distal end of the metal sleeve 3 a distance 5 arises. At the distance 5 it is a non-contact area.

LIST OF REFERENCE NUMBERS

1

 arthroscopy shaft

2

 Plastic shaft

3

 metal sleeve

4

 Nut

5

 distance

6

 Distal end

7

 First positive locking element

8th

 Second positive locking element

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely 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.

Cited patent literature

• EP 1269925 A1 [0002]
• DE 9404297 U1 [0003]

Claims (10)

Stem tube, in particular an arthroscopic shaft ( 1 ), with a connectable plastic shaft ( 2 ), characterized by a metal sleeve ( 3 ), wherein the metal sleeve ( 3 ) the arthroscopic shaft ( 1 ) suitable for supporting stabilization of the connectable plastic shaft ( 2 ). Shaft tube according to claim 1, characterized in that the metal sleeve ( 3 ) in one piece or connectable to the arthroscopy shaft ( 1 ) connected is. Shaft tube according to claim 1 or 2, characterized in that the metal sleeve ( 3 ) only a part of the length of the connectable plastic shaft ( 2 ) so that it is at a distal end ( 6 ) of the connectable plastic shaft ( 2 ) to a non-contact area between the metal sleeve ( 3 ) and the connectable plastic shaft ( 2 ) comes. Shaft tube according to one of the preceding claims, characterized in that the connectable plastic shank ( 2 ) consists partly or entirely of plastic. Shaft tube according to one of the preceding claims, characterized in that the connectable plastic shank ( 2 ) over the metal sleeve ( 3 ) is drawable. Shaft tube according to one of the preceding claims, characterized in that the connectable plastic shank ( 2 ) by a locking mechanism with the arthroscopic shaft ( 1 ) is determinable. Shaft tube according to claim 5, characterized in that the fixing mechanism a union nut ( 4 ) or a bayonet closure or a self-tightening closure, wherein the union nut ( 4 ) via the connectable plastic shaft ( 2 ) and can be tightened on the arthroscope shaft, so that the connectable plastic shaft ( 2 ) with the arthroscopic shaft ( 1 ) is connectable. Shaft tube according to one of the preceding claims, characterized in that the connectable plastic shank ( 2 ) a first form-fitting element ( 7 ). Shaft tube according to one of the preceding claims, characterized in that the arthroscopic shaft ( 1 ) a second positive locking element ( 8th ). Shaft tube according to claim 8, characterized in that the first positive locking element ( 7 ) and the second form-locking element ( 8th ) are self-centering form-fitting connectable.

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