Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1998-12-09
2000-04-04
McDermott, Corrine
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604256, 604264, A61M 5178
Patent
active
060455357
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is in the field of surgical sealing sleeves for providing temporary access to the interior of a mammal organ in general. In particular, the present invention relates to a surgical sealing sleeve having a unidirectional valve at its distal end for preventing undesirable leakage from a mammal organ's interior to an access environment.
BACKGROUND OF THE INVENTION
Intraocular surgical procedures require three or more sclerotomies for enabling the introduction into an eye's interior of a light probe and a surgical instrument and the connection to either a supply line to a source of pressurized air or an irrigation line to a source of physiological liquid for maintaining normal intraocular pressure despite a continuous undesirable leakage from the eye's interior through the sclerotomies. In view of physiological considerations, the diameter of a sclerotomy is limited to between about 1 mm-1.5 mm.
U.S. Pat. No. 4,795,426 describes a tip portion for a catheter placement cannula, the tip portion being in the form of a pair of flexible lips which assume a naturally flattened shape to provide a seal for preventing the backflow of blood or other fluids. To this end, the lips are made of shape retaining memory material of a relatively thick dimension. In view of such a construction, the tip portion is suitable for insertion into a large access port as made in, for example, an abdominal wall, however, it does not lend itself for miniaturization for insertion into a small access port, for example, a sclerotomy.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a novel surgical sealing sleeve enabling temporary access to the interior of a mammal organ and having a unidirectional valve at its distal end for preventing undesirable leakage from a mammal organ's interior to an access environment.
In accordance with the teachings of the present invention, there is provided a surgical sealing sleeve for preventing undesirable leakage from the humoral fluid filled interior of a mammal organ to an access environment during its temporary seating in an access tissue to the mammal organ, the surgical sealing sleeve comprising: tissue and having an axially extending passageway, said sleeve including an inner sleeve member nested at least along a portion of its length within an outer sleeve member, each of said inner and outer sleeve members having a proximal end and a distal end, said inner sleeve member having at least one distally directed sheath support member terminating proximal to said distal end of said outer sleeve member; and outer sleeve members and distally extending so as to fit over said at least one sheath support member, said elastomeric sheath having a a priori sealed end adapted to be cut in situ so as to provide an unidirectional slit valve normally closed under the pressure prevailing in the mammal organ's interior so as to prevent leakage of its contents therefrom via said passageway to the access environment.
The surgical sealing sleeve in accordance with the teachings of the present invention particularly lends itself as an ophthalmic surgical sealing sleeve in that it can be readily miniaturized to a size suitable for insertion into a sclerotomy, e.g., having a diameter in the range of about 1 mm-1.5 mm. However, that notwithstanding, it will be readily appreciated that the surgical sealing sleeve can be adapted for use in large access ports.
The proximal end of the sleeve is preferably formed with an upright projection for releasable insertion into a matching bore in a cutting tool employed for cutting the elastomeric sheath to form the unidirectional slit valve. The projection cum bore ensure that the cutting tool can only cut the elastomeric sheath in a predetermined manner and that the depth of insertion of the cutting tool into the eye is limited to as to prevent infliction of damage to the eye's interior structure.
In addition, the proximal end of the sleeve is preferably formed with an internal screw thread for releasable enga
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McDermott Corrine
One Way Ocular Technology Ltd.
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