Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis
Patent
1990-03-29
1992-12-15
Shay, Randy C.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
128887, 604294, A61F 202
Patent
active
051712709
ABSTRACT:
A canalicular implant adapted to be inserted into the punctum of an eye and which is adapted to be transported into the horizontal portion of the canaliculus to occlude the same is shown. The implant comprises an elongated member having a medial end, an opposed lateral end and a central member having a predetermined dimensional cross-section extending therebetween. The medial end has a tapered section which slopes and decreases in cross-section as it extends towards the medial end. The tapered section terminates in a medial tip having a dimension which enables the medial tip to enter and pass through the punctum. The lateral end has a collapsible flared section which increases in cross section as it approaches the lateral end and which terminates in an outer edge having dimension which is greater than the predetermined dimensional cross section of the central member. The collapsible flared section has a fully extended position and a collapsed position. The dimension of the collapsible flared section is approximately equal to the geometrical dimension of the horizontal section of a canaliculus of an eye adapted to receive the same. A radial force applied in a direction to collapse the outer edge of the collapsible flared section urges the same from its fully extended position into the collapsed position.
A method for treating external eye condition due to a deficiency of tears utilizing the canalicular implant is also shown.
REFERENCES:
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patent: 4650851 (1987-03-01), Rhum et al.
patent: 4660546 (1987-04-01), Herrick et al.
"The Punctum Plug: Evaluation of a New Treatment for Dry Eye", Freemon American Academy of Ophthalomology and Optometry, pp. OP-874 Through OP-879, vol. 79 Nov.-Dec. 1975.
Diagnosis and Treatment of Keroconjunctivitis, New Orleans, Barraquer et al., Acad. of Ophthalmology, 1980. p. 43.
Intro-Canalicular Gelatin Implants in the Treatment of Kerato-Conjunctivitis Sicca by Wallace S. Foulds; Brit. J. Ophthal (1961) vol. 45, pp. 625-627.
Blinking and the Mechanics of the Lacrimal Drainage System; Marshall G. Doane, Ophthalmology, vol. 88, No. 8, Aug. 1981, pp. 844 through 851.
"Lacrimal Function", Jones LT; Marquismm; and Vincent, NJ; American Journal Ophthalmol 73; 1942, pp. 658-659.
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