DE4413920B4 - Insert for viewing opening of a drape and drape with such an insert and surgical microscope with such drape and insert - Google Patents

Abstract

Insert (15, 15 ', 50, 55) for a viewing opening of a drape (10)
- which is releasably attachable to a tubular attachment (18) of an operating microscope (11) in front of your main objective,
- With a flat, optically transparent protective element (22, 22 ', 57)
characterized in that
the flat, optically transparent protective element (22, 22 ', 57) is arranged inclined in the insert in such a way that when the insert is attached to the tubular attachment (18) of an operating microscope (11) in front of the main objective, the geometric normal (60) the flat optically transparent protective element (22, 22 ', 57) and the optical axis (20) of the main objective enclose an acute angle (α) with one another.

Description

The present invention relates to an engagement for a viewing opening in a sterile protective cover for a Surgical microscope according to the preamble of claim 1. Such sterile protective cover is usually also called a drape and has an optically transparent or transparent viewing opening for the Main objective of the surgical microscope. The invention relates a drape with such an insert and an operating microscope, which is equipped with a drape and the appropriate insert.

An application of the type mentioned at the beginning for a drape in an operating microscope is from the US 3,796,477 known. This insert comprises a ring made of elastic material that can be attached to an annular outer wall of a housing section of a main microscope objective. A receptacle for a cover glass in the form of a flat, optically transparent protective element is provided on this ring. Furthermore, the ring can hold a drape in the area of the main microscope objective by clamping it between itself and the end face of the main microscope objective.

The US 4,266,663 also discloses a drape for a surgical microscope with a viewing aperture. On a surgical microscope, the drape is held in the area of the viewing opening with a connection ring on the main microscope objective. This connection ring has a seat for a flat, transparent protective element that covers the main microscope objective.

From the US 4,564,270 is known a holding device for a drape in a surgical microscope, which comprises a holding block made of resilient material. This holding block is placed and the outer wall of the main microscope objective and held there by friction. The drape is received on the holding block with a viewing opening in the area of the main microscope objective. The holding device is further assigned a flat, transparent cover element which covers the main microscope objective towards the operating area.

Usually include drapes for Surgical microscopes certain devices for protecting the lenses of the main microscope objective. Generally takes place here a tubular body with a circumferential flange use. The flange is from a circular Section of the drape enclosed or sealed, which the viewing opening of the Represents drapes. The tubular body is also releasable as well as collapsible on a likewise tubular attachment of the surgical microscope attached, in which the main lens is arranged. The tubular body is relatively short in the axial direction and also includes a holding device for a flat, optically transparent protective element to protect the Lens of the main lens. This protective element can be made of glass or be made of a suitable plastic material and is usually arranged perpendicular to the optical axis of the main lens.

Modern surgical microscopes are usually arranged on elaborate tripods, with several spatial Degrees of freedom of the surgical microscope movement thus realized can be. In this case, three axes which are perpendicular to one another are usually provided, around which one rotation can be implemented and three perpendicular to each other oriented axes along which a shift of the complete Surgical microscope possible is. For certain Orientations of the surgical microscope with the lighting arrangement remaining the same arise with the conventional Drapes now has internal reflections between the lens of the main lens and the flat, optically transparent protective element on the drape. A total of this results in a poorer visual impression for the surgeon.

Object of the present invention is the sight opening in a surgical microscope with drape so that none disturbing an observer Reflections occur. To avoid disadvantages of the prior art.

This task is solved by an engagement for a viewing opening a drape with the features of claim 1 and a drape with the features of claim 11 and a surgical microscope the features of claim 12.

A drape with use according to the invention offers now an improved observation quality through the use of the drape protected Surgical microscope.

According to the invention, this is a relatively simple one Construction used, which furthermore only low manufacturing costs caused and used without much practice can be.

This is achieved according to the invention in that an insert which can be connected to the viewing opening of the drape is provided and is releasably attached to the tubular attachment of the surgical microscope in which the main objective is arranged. The two parts are advantageously pushed into one another. Furthermore, the insert comprises a flat, optically transparent protective element arranged therein. The flat, optically transparent protective element is arranged in such a way that the geometric normal to the flat optically transparent protective element includes a defined, acute angle to the optical axis of the main objective, ie an angle not equal to 90 °. Possible reflections are thus deflected away from the optical axis and the disadvantages described above of the prior art thus avoided.

Other advantages and details the invention emerge from the following description of embodiments based on the attached figures.

It shows

1 a simplified representation of a surgical microscope in connection with an embodiment of the drape according to the invention;

2 an enlarged side view of the drape insert 1 ;

3 a top view of the optically transparent protective element in the drape 2 ;

4 a further embodiment of the drape insert 2 ;

5 another possible embodiment of the drape insert.

In 1 is a drape ( 10 ), consisting of a soft plastic material, which a surgical microscope ( 11 ) protectively surrounds. From the surgical microscope ( 11 ) only the upper part is shown. It is also visible in 1 a connecting element ( 12 ) that the surgical microscope ( 11 ) connects to a known floor or ceiling tripod, the tripod used in turn having a series of movable articulated elements.

The surgical microscope ( 11 ) includes a standard binocular tube ( 13 . 13 ' ) including a device with an actuator ( 14 ), which enables the adjustment of the pupil distance for the user.

For the drape according to the invention ( 10 ) includes an insert ( 15 ) with an outwardly extending radial flange ( 16 ), which is enclosed by the edge of the viewing opening in the drape or for connection to the drape ( 10 ), respectively the view opening of the drape ( 10 ) serves. The connection between the use ( 15 ) and the drape ( 10 ) can be done in many different ways, e.g. as an adhesive connection etc.

The tubular bore ( 17 ) of use ( 15 ) is also dimensioned in such a way that a telescopic connection of the insert ( 15 ) and thus the drape with the also tubular attachment of the surgical microscope ( 11 ) is possible in which the main lens is arranged. The bore diameter must of course be adjusted accordingly.

As a result, the releasable arrangement of the Drapes realized on the surgical microscope.

As in 2 shown, there is use ( 15 ) made of a cylindrical molded plastic part, the circular bore one or more angularly distributed ribs ( 19 ) which, for a frictional connection with the tubular attachment of the surgical microscope ( 11 ) in which the main lens is arranged. The concentric arrangement of the insert ( 15 ) around the central axis ( 20 ) of the main object is in 2 indicated schematically.

The use ( 15 ) is bevelled cut on its underside, the bevel inside the insert with a circular circumferential shoulder ( 21 ) is provided. About the circulating paragraph ( 21 ) becomes a flat, optically transparent protective element ( 22 ) detachable in a defined manner in use ( 15 ) arranged. The flat, optically transparent protective element ( 22 ) is like in 3 shown, usually designed disc or circular. For detachable arrangement of the protective element ( 22 ) in use ( 15 ) is a bayonet-type one-way connection with interacting projections ( 23 ) and recesses ( 24 ) provided as a connecting means at uniformly distributed intervals. The optically transparent protective element ( 22 ) on the circumferential paragraph ( 21 ) arranged. Other protruding ribs ( 25 ) on the optically transparent protective element ( 22 ) are an integral part of this element ( 22 ).

After the optically transparent protective element ( 22 ) so in use ( 15 ) that the ribs arranged inside the insert ( 23 ) with those on the protective element ( 22 ) arranged ribs ( 25 ) butt together, a quick twisting movement means that this element can be fastened in a precise position ( 22 ) in use ( 15 ) possible. The on the optically transparent protective element ( 22 ) provided ribs ( 25 ) are used for rapid pre-positioning of the bayonet connection, so that, for example, the protective element can be changed quickly during an operation ( 22 ) is possible if this has been contaminated by blood, for example, and a clean, new protective element ( 22 ) is needed.

The protective element ( 22 ) can be made both from a suitable optically transparent plastic material and from glass.

Based on 4 a particularly simple embodiment of the invention, in particular the use ( 15 ' ). Here, the use ( 15 ' ) designed as a single plastic molded part, which was manufactured, for example, by an injection molding process. A single transparent plastic material, for example methyl methacrylate, was used here. This means that in a single manufacturing step, the cylinder bore ( 17 ' ) integrated flat, optically transparent protective element ( 22 ' ) including the remaining stake ( 15 ' ). Again, an inclination of the protective element ( 22 ' ) to the optical axis, which with the bevel on the underside of the insert ( 15 ' ) matches. The peripheral outer flange ( 16 ' ) is with the actual drape ( 10 ) or the viewing opening of the drape and enclosed by this. The on the job ( 15 ' ) arranged ribs ( 19 ' ) in turn serve for the frictionally releasable arrangement or connection of the insert ( 15 ' ) with the attachment of the surgical microscope in which the main objective is arranged, as in the 2 and 3 shown.

Another embodiment of the insert is in 5 shown. Here is a first tubular insert ( 50 ) with a circumferential flange and a circular hole ( 51 ) and one or more ribs ( 52 ) provided on the inside of the insert. This insert is connected via the flange ( 50 ) with the viewing opening of the drape (not shown, indicated by the arrow with the reference symbol A).

The first insert ( 50 ) furthermore has one or more projections or ribs arranged on the outside ( 53 ) for a frictional, detachable connection with a second insert ( 55 ) to care. The first insert part fits ( 50 ) concentric in the circular hole ( 54 ) of the second, reusable insert ( 55 ). Usually the first insert part ( 50 ) with the drape ( 10 ) connected, preferably at the points marked with A. The first insert ( 50 ) can in turn be designed as an easy-to-manufacture plastic injection molded part and can be disposed of together with the drape after use. The second insert ( 55 ), however, can still be used and is autoclavable for this purpose. This insert part ( 55 ) either made of stainless steel or as an investment casting or provided with a suitable coating.

The second insert ( 55 ) also has a circular circumferential shoulder ( 56 ) on which the flat, optically transparent protective element ( 57 ) lies in the edge area. Paragraph ( 56 ) therefore serves as a support surface that ensures that the protective element sits securely ( 57 ) in use ( 50 . 55 ) guaranteed. The protective element ( 57 ) can be made, for example, from optically high-quality glass or from suitable transparent plastic material. The protective element ( 57 ) is secured by an annular securing element ( 58 ) on the paragraph ( 56 ) releasably attached by means of a screw connection. The paragraph ( 56 ) and the securing element ( 58 ) matching threads and internal threads.

In an alternative embodiment to the in 5 shown insert the flange of the upper insert part ( 50 ) not connected to the drape beforehand. Instead, the viewing opening of the drape has a pressure-dependent circular adhesive coating that is concentric and circular to the viewing opening. The adhesive coating is either connected to the upper part of the flange at point A, or put over the cylindrical lower part and connected to the underside of the flange.

After assembling the two parts ( 55 . 50 ) a secure and tight connection is established between the drape and the insert.

The different described embodiments of the present invention offer various advantages depending on the use of the surgical microscope ( 11 ). In all embodiments, the flat, optically transparent protective element is arranged obliquely with respect to the optical axis of the main objective of the surgical microscope, ie at a preferably acute angle. The inclination, ie the angle α between the normal ( 60 ) on the flat, optically transparent protective element and the main lens axis ( 20 ), is advantageously in a range between 10 ° and 30 °. An advantageous embodiment has approximately an angle α = 15 °.

The in the 2 and 5 Embodiments of the invention shown are particularly advantageous for surgical microscopes if laser radiation is simultaneously used which passes through the microscope optics. The optically transparent protective elements ( 22 . 57 ) can be removed in this case.

Claims (14)

Commitment ( 15 . 15 ' . 50 . 55 ) for a viewing opening of a drape ( 10 ) - the detachable on a tubular attachment ( 18 ) an operating microscope ( 11 ) can be attached in front of your main lens - with a flat, optically transparent protective element ( 22 . 22 ' . 57 ) characterized in that the flat, optically transparent protective element ( 22 . 22 ' . 57 ) is inclined in the insert in such a way that when the insert is attached to the tubular attachment ( 18 ) of an operating microscope ( 11 ) the geometric normal in front of the main lens ( 60 ) on the flat, optically transparent protective element ( 22 . 22 ' . 57 ) and the optical axis ( 20 ) of the main lens form an acute angle (α). Insert according to claim 1, characterized in that the insert ( 15 . 15 ' . 50 . 55 ) a radial circumferential flange ( 16 . 16 ' ) which is provided for connection to the viewing opening of the drape. Insert according to claim 1 or 2, characterized in that the insert ( 15 . 15 ' . 50 . 55 ) and the flat, optically transparent protective element ( 22 . 22 ' 57 ) were produced as the only part using an injection molding process and an optically transparent plastic material was used for this. Insert according to one of claims 1 to 3, characterized in that the insert ( 15 . 15 ' 50 . 55 ) inside a circular contact surface ( 21 . 56 ) which has a secure fit of the flat, optically transparent protective element ( 22 . 22 ' . 57 ) guaranteed. Insert according to one of claims 1 to 4, characterized in that the insert ( 15 . 50 . 55 ) and the flat, optically transparent protective element ( 22 . 57 ) are releasably connected to each other. Use according to one of claims 1 to 5, characterized in that the flat, optically transparent protective element ( 22 . 57 ) is made of glass. Use according to one of claims 1 to 5, characterized in that the flat, optically transparent protective element ( 22 . 22 ' . 57 ) is made of a transparent plastic material. Insert according to one of claims 1 to 7, characterized in that a first insert part ( 50 ) is provided, which has a radially circumferential flange, which serves to insert the insert ( 50 ) with the viewing opening of the drape ( 10 ) to connect, with a second insert ( 55 ) is provided in which the flat, optically transparent protective element ( 57 ) is arranged, the second insert ( 55 ) with the first insert ( 50 ) is slidably connected. Use according to one of claims 1 to 8, characterized in that that the angle (α) in the range between 10 ° and 30 °. Use according to one of claims 1 to 9, characterized in that that the angle (α) is about 15 °. Drape ( 10 ) for a surgical microscope ( 11 ), consisting of soft plastic material, with an insert ( 15 . 15 '; 50 . 55 ) according to one of claims 1 to 10. Surgical microscope ( 11 ) with drape ( 10 ) according to claim 11. Use of an insert ( 15 . 15 '; 50 . 55 ) according to one of claims 1 to 10 as a viewing opening for a surgical microscope ( 11 ) with drape ( 10 ). Use of an insert ( 15 . 15 '; 50 . 55 ) according to one of claims 1 to 10 as a viewing opening for a drape ( 10 ).