DE20116266U1 - Spring handle instrument, especially for microsurgery - Google Patents

Description

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WESTPHAL· MUSSGNUG & PARTNER

PATENT ATTORNEYS· EUROPEAN PATENT ATTORNEYS

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ANTYLLOS Medical Technology GmbH

Carp Street 2 0

78532 Tuttlingen

- Utility model registration -

Spring-grip instrument, especially for microsurgery

D-78048 VS-Villingen · Waldstrasse 33 ■ Telephone 07721 88380 ■ Fax 07721 883850

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Description

Spring-grip instrument, especially for microsurgery

The invention relates to a spring-grip instrument, in particular for microsurgery according to the preamble of claim 1.

In microsurgery and, for example, in eye surgery, spring-grip instruments, particularly spring-grip scissors, are used. These have two elastically springy parts that are curved outwards in a mirror-symmetrical manner in their longitudinal direction. At the proximal end, the two handle parts are movably connected to one another. At their distal ends, the handle parts turn into active parts, for example scissor blades, which are pivotally connected to one another. The spring properties of the handle parts hold the active parts in their open position. If the handle parts are pressed together against their spring force, the active parts close so that, for example, a cut can be made with the scissors.

If the handle parts run from their proximal end to the distal active part in their curvature plane, the surgeon must hold the instrument at a slight angle so that his hand does not impair the view of the active parts of the instrument. The active plane, for example the cutting plane of a spring scissors, is therefore also inclined against the desired cutting plane.

If the handle parts are bent in a bayonet shape, the view of the active parts and therefore the location of these active parts is not impaired by the operator's hand. However, the bent shape means that the plane of force introduction to the handle parts is different from the plane of force application.

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transmission from the active parts to the fabric, which can cause a tilting moment on the active parts, so that the active parts tilt relative to the desired active plane.

The invention is based on the object of providing a spring-grip instrument which does not have these disadvantages and, when using the instrument, combines an unobstructed view of the active parts with a force introduction to the active parts free of tilting moments.

This object is achieved according to the invention by a spring-grip instrument having the features of claim 1.

Advantageous embodiments of the invention are specified in the subclaims.

The main idea of the invention is to bend the handle parts of the spring-grip instrument in a bayonet shape so that the surgeon's hand grasping and operating the handle part does not impair the view of the active parts of the instrument in the operating field. The extension section of the handle parts leading from the bend point of the handle parts to the active parts is also angled against the curvature plane of the handle parts so that the active parts again lie essentially in the curvature plane of the handle parts, i.e. in the plane in which the handle parts are pressed together by the surgeon's hand. The active plane and the actuation plane thus coincide so that when the force is transmitted from the surgeon's hand to the handle parts and from the handle parts via the active parts to the patient's tissue, no tilting moment occurs which could impair the precision of the surgical procedure, for example an incision.

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Preferably, the handle parts each have a preferably annular recess at the transition from the proximal actuating section to the crank section, which enables particularly safe and sensitive actuation of the instrument.

The invention is explained in more detail below using an embodiment shown in the drawing.

Fig. 1: a perspective view of a spring grip instrument and

Fig. 2: a side view of a handle part of the instrument,

In the embodiment shown, the spring-grip instrument is designed as a spring scissors for microsurgery. Other applications of the invention are readily apparent. Other versions differ only in the design of the active parts.

The spring-grip instrument has two handle parts made of an elastically springy steel alloy. The handle parts are curved outwards in a mirror-symmetrical manner to the longitudinal central axis of the instrument and are connected to one another at their proximal end. At the distal end, the handle parts merge into active parts 10, which in the embodiment shown are designed as scissor blades.

The proximal area of the handle parts forms an actuating section 12. The actuating section 12 is designed as a flat leaf spring, has the strongest curvature towards the outside and essentially determines the spring properties of the instrument. At the proximal end of the actuating section 12, one handle part has an elongated hole 14 into which an end tab 16 of the actuating section 12 of the other handle part

partially engages. As a result, the proximal ends of the actuating sections are movably connected to one another, with the design of the elongated hole 14 absorbing the longitudinal displacement that occurs when the actuating sections 12 are pressed together. 5

Approximately in the middle of the length of the handle parts, they transition from the actuating section 12 into a crank section which is angled at an angle of approximately 60° from the curvature plane of the actuating sections. This curvature plane is shown in dash-dotted lines in Figure 2. At the transition from the actuating section 12 to the crank section 18, a finger recess 20 is formed which is designed as a ring with a circular inner opening.

The offset sections 18 in turn merge into extension sections 22 at opposite angles, which essentially form the distal half of the length of the handle parts. The offset sections 18 and the extension sections 22 have a slightly greater material thickness than the spring-loaded actuating sections 12, so that the handle parts bend during actuation essentially in the area of the actuating sections 12 and practically not in the area of the offset sections 18 and the extension sections 22.

The active parts 10 are formed at the distal end of the extension sections 22, with a pin 24 pivotally connecting the handle parts in the area of the active parts 10. The angle of the crank section 18 relative to the curvature plane of the actuating sections 12 and the angle of the extension sections 22 relative to the crank sections 18 is selected such that the extension sections 22 are again inclined against the curvature plane and the active parts 10 lie in this curvature plane of the actuating sections 12.

Claims (3)

1. Spring-grip instrument, in particular for microsurgery, with two elastically springy handle parts which, in their longitudinal direction, are curved outwards in a mirror-symmetrical manner to one another, are movably connected to one another at their proximal ends and, at their distal ends, pass into active parts which are pivotably connected to one another, characterized in that the handle parts have a bayonet shape and consist of a proximal actuating section ( 12 ), a central crank section ( 18 ) and a distal extension section ( 22 ), the actuating sections ( 12 ) lying in the curvature plane of the handle parts, the crank sections ( 18 ) being angled out of the curvature plane and the extension sections ( 22 ) being angled towards the curvature plane in such a way that the active parts ( 10 ) again lie essentially in the curvature plane. 2. Spring-grip instrument according to claim 1, characterized in that a finger recess ( 20 ) is formed at the transition from the actuating section ( 12 ) to the crank section ( 18 ) of the handle parts. 3. Spring grip instrument according to claim 2, characterized in that the finger recess ( 20 ) is ring-shaped with a circular opening.