Ultrasonic vitrectomy needle
AssigneeBausch & Lomb Incorporated
InventorBrian D. McCary
Life of this patent
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Abstract
A needle for use with an ultrasonic handpiece for dissecting and aspirating vitreous tissue includes a cannula having a lumen extending from a port adjacent a cannula distal tip to a cannula proximal end. The cannula port has a cross-sectional area less than a cross-sectional area of the cannula lumen. A hub attached to the cannula proximal end attaches to the ultrasonic handpiece. A needle lumen is formed from the cannula port to a proximal end of the hub. A length of the needle lumen is approximately an odd quarter of a drive frequency wavelength of the ultrasonic handpiece and a cannula length measured from the cannula distal tip to a distal end of the hub is long enough to extend from an incision site across a posterior segment of an eye.
Claims24
A needle for use with an ultrasonic handpiece for dissecting and aspirating vitreous tissue, the needle comprising:
- a cannula having a lumen extending from a port adjacent a cannula distal tip to a cannula proximal end;
- wherein the cannula port has a cross-sectional area less than a cross-sectional area of the cannula lumen;
- a hub attached to the cannula proximal end, the hub including structure for attachment to the ultrasonic handpiece;
- wherein the hub includes a lumen extending through the hub, the hub lumen being coaxial and in communication with the cannula lumen, such that a needle lumen is formed from the cannula port to a proximal end of the hub;
- and
- wherein a length of the needle lumen is approximately an odd quarter of a drive frequency wavelength of the ultrasonic handpiece and a cannula length measured from the cannula distal tip to a distal end of the hub is long enough to extend from an incision site across a posterior segment of an eye.
A needle for use with an ultrasonic handpiece for dissecting and aspirating vitreous tissue, the needle comprising:
- a cannula having a lumen extending from a port adjacent a cannula distal tip to a cannula proximal end;
- wherein the cannula port has a cross-sectional area less than a cross-sectional area of the cannula lumen;
- a hub attached to the cannula proximal end, the hub including structure for attachment to the ultrasonic handpiece;
- wherein the hub includes a lumen extending through the hub, the hub lumen being coaxial and in communication with the cannula lumen;
- and
- wherein a length of the cannula lumen is approximately an odd quarter of a drive frequency wavelength of the ultrasonic handpiece and a cannula length measured from the cannula distal tip to a distal end of the hub is long enough to extend from an incision site across a posterior segment of an eye.
A needle for use with an ultrasonic handpiece for dissecting and aspirating vitreous tissue, the needle comprising:
- a cannula having a lumen extending from a port adjacent a cannula distal tip to a cannula proximal end;
- wherein the cannula port has a cross-sectional area less than a cross-sectional area of the cannula lumen;
- the cannula for attachment to a distal end of the ultrasonic handpiece, such that the cannula lumen is in communication with an aspiration path formed in the ultrasonic handpiece, wherein the aspiration path has a cross-sectional area significantly larger than the cannula lumen cross-sectional area;
- and
- wherein a length of the cannula lumen is approximately an odd quarter of a drive frequency wavelength of the ultrasonic handpiece and a cannula length measured from the cannula distal tip to the distal end of the ultrasonic handpiece is long enough to extend from an incision site across a posterior segment of an eye.
Dependencies are inferred from the claim text.