JPS6328616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a medical device having two instrument arms, such as wound clips, retractors, braces, etc., whose spacing is adjustable from one another, and wherein the adjusted spacing between the instrument arms is adjustable. of the type with a locking device for locking the instrument arm in one adjustment direction so as not to change the instrument arm.

Medical instruments of this type are known in various constructions depending on the intended use, but are generally constructed as pincers with a pincer hinge connecting both instrument arms, or It is designed as a clamp whose arms are movable parallel to each other along one guide rail.

The locking device, which locks the pincers in at least one direction of adjustment against unintentional fluctuations in the mutual spacing of the pincer arms, is constructed in the known device as a toothed locking element with locking teeth of this tooth profile. There is. A disadvantage is that such a locking element only allows the two instrument arms to be fixed to each other at different spacings, each with one pitch of the locking teeth. Even in the free adjustment direction, the rear inclined flanks of the locking teeth that are moved relative to each other are often disadvantageously locked together, which can only be achieved by a temporary elastic deformation of the instrument, at least in the area of the tooth locking element. Inevitable. As a result, the known instruments leave room for improvement in terms of precise and fine adjustment and fixation of the two instrument arms relative to each other.

The object of the invention is to improve a medical instrument of the type mentioned at the outset, in which both instrument arms can be adjusted to each other continuously and without ratcheting effects and can be fixed in any position at will in relation to their mutual spacing. It's about getting it.

In order to achieve this objective, the configuration of the present invention includes:
On the slide rail connected to one instrument arm, a clamping casing connected to the other instrument arm is guided in an infinitely adjustable manner, into which the clamping casing opens towards the slide rail. at least one cutout is provided;
The clamping surface of this notch facing the slide rail is aligned with the slide rail in an adjustable direction that can be locked between the clamping casing and the slide rail by a clamping member fitted into the notch. inclined at an angle creating a self-locking effect, loaded by a spring in a direction opposite to the direction of adjustment in which the clamping member can be locked, and by a release member actuatable from the outside. It is adapted to be moved from the self-locking position against force.

In one embodiment of the invention, the instrument arms are easily adjustable in the opposite direction to the lockable adjustment direction and are infinitely adjustable in the lockable adjustment direction by actuating the release member. In order to fix the mutual spacing steplessly, the release member is simply released in the lockable adjustment direction, whereby the clamping casing and the slide rail are automatically moved through the clamping member. tightened together.

In an advantageous embodiment with significantly higher fixing security of both instrument arms, two recesses each having a clamping member and a spring are provided in the clamping casing in such a way that they are located diametrically with respect to the slide rail. It is being This results in a symmetrical and highly effective transmission of the clamping forces between the slide rail on the one hand and the clamping housing on the other hand.

In a particularly advantageous constructional embodiment, the recess is formed by a hole, which can be locked between the clamping casing and the slide rail by means of a clamping element inserted into the bore. It opens into the guide passage of the slide rail at an angle that produces a self-locking effect in the possible adjustment directions, and in the area of this opening, a part of the peripheral wall surface directly forms a clamping surface, so that the spring can be fixed. It is closed at the free end by a screw receiving and supporting this spring, and the clamping member consists of a ball movable in the bore. The release element consists of a sleeve, which is slidably guided in the clamping casing so as to surround the slide rail coaxially with the slide rail, and is adapted to the spring force of the spring. Advantageously, it rests against the clamping element and is slidable from the outside against the spring force. Furthermore, a release element projects from the clamping casing and rests on a fork foot which is supported in the clamping casing in the area of the free end (17) of the fork lever and is located in the fork opening receiving the slide rail. Advantageously, the end forms a stop that limits the lever adjustment movement relative to the slide rail.

In a further advantageous embodiment of the invention, if the instrument arms are arranged and connected in a pincer manner, the slide rail and the clamping casing are each hingedly connected to the instrument arms, and this hinge connection The hinge axes of the sections extend parallel to each other and to the axis of the pincer hinge sections directly connecting the instrument arms. In this case, the spacing between the pincer hinge on the one hand and the hinge connection of the slide rail or clamping casing on the two instrument arms on the other hand may be different from one another, which means that the sliding rail and clamping casing It is advantageous if the device has a constructional length that is greater than the minimum spacing between the two instrument arms. In any case, the slide rail has a cylindrical cross section.

If, on the other hand, the instrument arms are arranged so as to be movable parallel to one another along one guide rail, then the guide rails are designed directly as slide rails of the fixing device and can be pivoted onto this slide rail. It is advantageous if the permanently guided clamping housing is designed as a holding element for one of the instrument arms. In this case, the other instrument arm is rigidly connected to the slide rail.

Next, embodiments of the present invention will be specifically described using the drawings.

The medical instrument shown has two instrument arms 1, 2 which can be spaced apart from each other and are provided with a fixing device 3, which fixes these instrument arms 1, 2 in the direction of the arrow 4. Thus, in each illustrated adjustment direction, they are fixed relative to each other against variations in the adjusted distance. For this purpose, on a slide rail 5 connected to one instrument arm 2, a clamping casing 6 connected to the other instrument arm 1 is guided in an infinitely movable manner. Inside the tightening casing 6 there is a hole 2 that opens toward the slide rail 5.
Two notches 7 are provided. The clamping surfaces 8 of these notches 7 facing the slide rail 5 are connected to the slide rail 5 by the clamping members 10 fitted into the notches 7. They are inclined at an angle 9 which creates a self-locking effect in the adjustment direction that can be locked between them.
The clamping element 10 is loaded by a spring 11 in a direction opposite to the lockable adjustment direction (arrow 4 in FIG. 1). Furthermore, the clamping element 10 is movable against the spring force by means of a release element 12 which can be actuated from the outside and releases the self-locking action. The two recesses 7, each provided with a clamping element 10 and a spring 11, are located diametrically relative to one another with respect to the slide rail 5. The cutout 7 is formed by a hole 7.1 which extends at said predetermined angle 9 between the clamping surface 8 and the slide rail 5 and which is formed by a hole 7.1 for the slide rail 5. It opens into the guide passage 13 of. In this opening area, the hole 7.1 directly forms a clamping surface 8 with a part of its circumferential wall surface.
The bore 7.1, which receives the spring 11, is closed at its free end by a screw 14, on which the spring is supported. The clamping member 10 consists of a ball movable within the bore 7.1. The release member 12 is
It is designed as a sleeve that is movably guided in a clamping casing 6 coaxially with respect to the slide rail 5 and surrounding this slide rail. The sleeve end located in the clamping housing 6 rests against the clamping element 10 against the force of the spring 11. The release member 12 is connected to the spring 11 from the outside.
The release member 12 pushes the clamping member 10 back out of its self-locking position in the bore 7.1. For this purpose, the release element 12 projects from the clamping casing 6 at its end opposite the clamping element 10 . The edge of the release member, which projects from the clamping housing 6, rests against a fork leg 16 of a fork lever 15. The fork leg 16 is supported in the region of its free end at 17 in the clamping housing 6. End 1 of the fork opening receiving the slide rail 5
8 forms a stop for the slide rail 5 for limiting the movement of the lever. Of course, it is only when the release member 12 pushes the clamping member 10 into the hole 7.1 against the spring 11 that the stopper moves the clamping member 10 out of the self-locking position when the fork lever 15 is actuated. chosen to be released.

In the embodiment shown in FIGS. 1 and 4, the instrument arms 1, 2 are arranged and connected in a pincer manner. The slide rail 5 and the clamping housing 6 are hingedly connected to the instrument arm 1 or 2 at hinge connections 19, 20, respectively. In this case, the hinge axes 19.1, 20.1 of the hinge joints 19, 20 are parallel to each other and the pincer hinge axis 2 directly connects the instrument arms 1, 2.
It extends parallel to 1. In this case, the shaft 21 of the pincer hinge on the one hand and the hinge connection 19, 20 of the slide rail 5 or clamping housing 6 on the other hand
The distance between the two instrument arms 1, 2 can be the same (FIG. 1) or of different lengths (FIG. 4). The slide rail 5 may have a cylindrical cross section. This is because the clamping casing 6 does not need to be prevented from rotating on the slide rail 5.

In the embodiment shown in FIG.
They are movable parallel to each other along guide rails that directly form the two. In this case, the clamping casing 6, which is non-rotatably guided on the slide rail 5, is designed as a holding element for one instrument arm 1, whereas the other instrument arm 2
is fixedly attached to the slide rail 5.

[Brief explanation of the drawing]

The drawings show an embodiment of a medical device according to the invention with two instrument arms whose spacing is adjustable relative to each other, FIG. 1 being a perspective view of a wound clip, and FIG. FIG. 3 is a side view of the fixation device of FIG. 2 as seen in the direction of the arrow in FIG. 2; FIG.
The figure is a perspective view of another embodiment of a medical device, and FIG. 5 is a perspective view of another embodiment of a wound clip. 1 and 2... Instrument arm, 3... Fixing device, 4... Arrow, 5... Slide rail, 6... Tightening casing,
7... Notch, 7.1... Hole, 8... Tightening surface, 9... Angle, 10... Tightening member, 11... Spring, 12... Release member, 13... Guide passage, 14... Screw, 15... Fork lever, 16...Fork leg, 17... Code, 18
... end, 19... hinge joint, 19.1... hinge axis, 20... hinge joint, 20.1... hinge axis, 21... axis.

Claims (1)

[Scope of Claims] 1. A medical device comprising two instrument arms, such as wound clips, retractors, clamps, etc., whose spacing is adjustable from each other, and which does not change the adjusted spacing between the instrument arms. In the version with a locking device for locking the instrument arm in one direction of adjustment, on the slide rail 5 connected to one instrument arm 2, a tightening casing connected to the other instrument arm 1. 6 is guided in an infinitely adjustable manner, and in this clamping casing 6 there is provided at least one notch 7 which is open towards the slide rail 5. A clamping member 10 fitted into the notch 7 with the clamping surface 8 facing toward the slide rail 5
is inclined at an angle 9 that creates a self-locking effect in the adjusting direction in which the tightening member 10 can be locked between the tightening casing 6 and the slide rail 5, and in the adjusting direction in which the tightening member 10 can be locked. A spacing characterized in that it is biased by a spring 11 in the opposite direction and is adapted to be moved out of the self-locking position against the spring force by a release member 12 actuatable from the outside. Medical instrument with two adjustable instrument arms. 2. The clamping casing 6 is arranged so that the two notches 7, each having a clamping member 10 and a spring 11, are located diametrically with respect to the slide rail 5.
A medical device according to claim 1, provided within the scope of the present invention. 3 The notch 7 is formed by the hole 7.1, and this hole is used for the tightening member 10 fitted into the hole.
The opening opens into the guide channel 13 of the slide rail 5 at the angle 9 which produces a self-locking effect in the adjustment direction that allows locking between the clamping casing 6 and the slide rail 5. A clamping surface 8 is formed directly in the area with a part of the circumferential wall surface, which receives a spring 11 and is closed at its free end by a screw 14 supporting this spring 11. 3. A medical device according to claim 1, wherein the attachment member 10 is a ball movable within the hole 7.1. 4. The release element 12 consists of a sleeve, which is slidably guided in the clamping casing 6 coaxially to and surrounding the slide rail 5 and is spring-loaded at its edges. Any one of claims 1 to 3, which is in contact with the tightening member 10 against the spring force of 11 and is slidable from the outside against the spring force. Medical equipment listed. 5 A release element 12 projects from the clamping casing 6 and rests in the region of the free end (17) of the fork clamp 15 on a fork leg 16 which is supported on the clamping casing 6 and which allows the sliding rail 5
5. A medical device according to claim 4, wherein the end 18 of the fork opening receiving the fork forms a stop for limiting the lever adjustment movement relative to the slide rail 5. 6 If the instrument arms 1 and 2 are arranged and connected in a pincer manner, the slide rail 5 and the clamping casing 6 are hingedly connected to the instrument arms 1 and 2, respectively, and this hinge joint 19 ,2
Claims 1 to 5 in which the hinge axes 19.1, 20.1 of 0 extend parallel to each other and to the axis 21 of the pincer hinge part directly connecting the instrument arms 1, 2. The medical device described in any one of the preceding items. 7. On the one hand, the pincer hinge (shaft 21) and on the other hand, the hinge connection 1 of the slide rail 5 or clamping casing 6 on both instrument arms 1, 2.
7. The medical device according to claim 6, wherein the distances between the 9 and 20 are different from each other. 8. The medical device according to claim 1 or 7, wherein the slide rail 5 has a cylindrical cross section. 9. If the instrument arms 1, 2 are arranged movable parallel to one another along one guide rail, the guide rail is designed directly as a slide rail 5 of the fixing device 3 and is connected to this slide rail 5. Tightening casing 6 non-rotatably guided
6. A medical device according to claim 1, wherein the medical device is constructed as a holding member for one of the device arms 1, 2.