Surgery – Truss – Pad
Patent
1985-09-26
1987-11-17
Apley, Richard J.
Surgery
Truss
Pad
128305, A61F 900, A61B 1732
Patent
active
047066695
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to a device for perforating the lens capsule front wall in the eye of living beings for removing a part of the capsule wall and producing an opening therein, through which the lens capsule contents can be removed.
Up to now it has been common practice to open the lens capsule sack by means of most varied instruments, wherein, however, as a rule the edge of the opening cut into the front wall of the lens body sack has a more or less irregularly jagged or frayed shape. However, this is disadvantageous, especially with regard to surgical measures to insert an implantation lens in the patient.
For a long time the wish has existed to have a device which is in the position to cut out a circular disc of a certain size from the front wall of the lens capsule sack, in order to obtain a circular opening with a smooth, unjagged edge along the incision line. Devices which enable this have not become known up to now, for which reason the invention is based on the task of creating such a device which is able to carry out the task given above.
For the solution of this task it was proposed to design the device in question in such a way that an annular guideway is located on or in a cutting head insertable into the opened eye, along which guideway a cutting knife projecting beyond the guideway in an axial direction and making a circular incision during its movement is guided.
To be sure, the aforementioned device carries out its task in a quite satisfactory manner; however, conditioned by its mechanical construction, it is extraordinarily delicate and thus succeptible to breakdowns. Therefore, it is unsuitable as a device to be used in the operations in question.
SUMMARY OF THE INVENTION
The invention is based on the task of creating a device suitable for the purpose mentioned, constructively simple and dependably working, always ready for use, which makes it possible to open the lens capsule quickly and dependably in the desired, optimal manner, so that a hole in the front wall is obtained, which is located at the place at which it is desired, and which is defined with regard to its size and shape. Herein, in addition, the hydrostatic pressure in the front chamber of the eye should be maintained during the use of this device, in order to enable work in an optimal operating field.
The for solution of this task the proposal according to the invention is to design the device in question in the manner as described and shown in particular in patent claim 1 and furthermore in the the independent claims, dependent claims, as well as with reference to a preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 of the drawing drawing shows a longitudinal section through the device designed according to the invention;
FIG. 2 shows schematically alternate pneumatic drive means;
FIG. 3 corresponds to a rear portion of FIG. 1, but shows the drive ring in a frontmost position; and
FIG. 4 is a cross-section along line A--A of FIG. 1.
The inventive device or surgical instrument consists of a hand piece 11, on the front part 12 of which a tube 13 is coaxially attached. The front end 14 of the tube 13 is pressed somewhat flat and is provided with a curve 15. In the tube 13 an axially oscillating, movable wire 16 is mounted with relatively large play, the wire being wavily bent and provided with a point 18 at its front end 17.
The wire 16 is connected with its rear end to a shaft or piston 19, which projects with its front end 20 into the chamber 21 in the hand piece 11, which chamber is sealed towards the rear against the piston 19 by means of sealing collars 22. A connection piece 23 disposed on the hand piece opens into the chamber 21, onto which connection piece a hose can be fitted to convey liquid under predetermined pressure into the chamber 21, which liquid then exits during use of the device through the tube 13 guiding the wire and at its front end, to maintain a certain hydrostatic pressure in the opened front chamber of the eye to be operated on, which substantially faci
REFERENCES:
patent: 4210146 (1980-07-01), Banko
patent: 4246902 (1981-01-01), Martinez
patent: 4314560 (1982-02-01), Helfgott et al.
patent: 4530359 (1985-07-01), Helfgott et al.
Apley Richard J.
Macey H.
Teltscher Erwin S.
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