Syringe and cannula for insertion of viscoelastic material into

Details Syringe and cannula for insertion of viscoelastic material into Syringe and cannula for insertion of viscoelastic material into

1995-02-14

1998-08-11

Stright, Jr., Ronald K.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604117, 604272, 604239, 604240, 604241, A61M 3100, A61M 500

Patent

active

057920990

ABSTRACT:
A syringe for insertion of viscoelastic material into an eye includes a syringe body having an end with an opening therein and a pseudoplastic viscoelastic material disposed in the syringe body. The viscoelastic material is pseudoelastic and may have an initial viscosity of between about 5,000 and about 60,000 centipoise. Correspondingly a cannula is provided which includes a needle having a dispensing orifice on one end thereof and a first portion of between about 23- and about 18-gauge tubing, distal from the dispensing orifice and a second portion of between about 30- and about 23-gauge tubing, proximal to the dispensing orifice. Additionally a housing is provided for attaching another end of the needle, proximal to the first portion, to the end of the syringe body. A method for dispensing the viscoelastic material includes compressing the viscoelastic material in order to force the viscoelastic material out of the syringe and passing the forced viscoelastic material through a large gauge portion of a needle to establish flow of the viscoelastic material. Thereafter the forced viscoelastic material is passed through a narrow gauge portion of the needle for dispensing through an orifice therein.

REFERENCES:
patent: 4759746 (1988-07-01), Straus
patent: 4878904 (1989-11-01), Callaway
patent: 5002535 (1991-03-01), Gross
patent: 5284476 (1994-02-01), Koch
patent: 5554133 (1996-09-01), Haffner et al.

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