Surgery – Means for introducing or removing material from body for... – Material introduced into and removed from body through...
Patent
1988-01-04
1990-01-02
Kruter, Jerome L.
Surgery
Means for introducing or removing material from body for...
Material introduced into and removed from body through...
604 36, 604 35, A61M 100
Patent
active
048910449
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an ophthalmic aspirating/irrigating device.
BACKGROUND OF THE INVENTION
In the performance of some operations to the eye it is necessary to remove cortical fragments and/or other debris from behind the iris, such action being preferably followed by an irrigating action in which irrigating fluid is introduced behind the iris to ensure that the place from which the cortical fragments had been removed is clear. The instrument which has been developed to perform this operation comprises a syringe attached to a double needle having two passages one of which is open at the proximal end to the barrel of the syringe and the other of which is connectible at the proximal end to a source of supply of irrigating liquid and the distal ends of the two passages are open and close to one another. In operation of the aspirating/irrigating device the piston of the syringe is advanced and the distal end of the double needle is introduced into the eye and maneuvered into the position in which the distal end of the needle is in the portion of the eye containing the cortical fragments and/or other debris. Irrigating liquid is allowed to flow into the eye cavity containing the debris and the piston of the syringe is then withdrawn to draw the irrigating liquid containing the cortical fragments and/or other debris through the tube connected to the barrel of the syringe. It usually happens that at the first withdrawal of the plunger not all the debris is removed and it may be necessary to remove the device from the eye several times so that debris which has been withdrawn from the eye may be discharged from the syringe along with irrigating liquid, the needle then being re-inserted into the eye to remove remaining debris. It has been found that this action may have to be performed as often as three or four times.
The repeated insertion of a needle into the eye is highly undesirable and it is an object of the present invention to provide an aspirating/irrigating device which requires only one insertion into an eye to remove all the debris and irrigate the eye.
SUMMARY OF THE INVENTION
In accordance with invention, an ophthalmic aspirating/irrigating device is provided having, in use, a distal end and a proximal end and comprising a needle comprising two tubes disposed in close proximity, and terminating at one end close to one another at the distal end of the device, said one end of said tubes being insertable into an eye to be treated; and valve means connecting the other end of one tube to a syringe, said valve means comprising a first one way valve which provides passage only from the syringe to a discharge opening of the device and a second one way valve which provides passage only in the direction from said one tube to the syringe, each of said valves comprising two flexible lips normally in contact with one another and separable by a pressure rise across the valve to present an orifice, and said valves being so disposed that when the device is in a vertical position with the needle projecting downwardly, the orifice of said first valve is located a distance of at most 1 mm below the level of the orifice of said second valve.
The invention also comprises the combination of a device as described and a syringe to which the device is fitted.
Each one way valve may be formed as two flexible lips which are normally in contact with one another and forming together an acute angle so that the lips can be moved apart by a pressure rise across the valve in one direction and will be forced together by a pressure rise across the valve in the other direction.
The two valves may be incorporated within a body having a straight tubular portion containing the valve providing one way access from the needle tube to the syringe and a branch containing the valve providing one way access from the syringe to a discharge opening.
For a reason to be explained later it is important to locate the valves such that when the device is in a vertical position with the needle projecting downwardly the tip
REFERENCES:
patent: 3818907 (1974-06-01), Walton
patent: 4014333 (1977-03-01), McIntyre
patent: 4084606 (1978-04-01), Hleman
Coats Viyella Medical Limited
Kruter Jerome L.
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