Dialysis needle
First Claim
Patent Images
1. A dialysis needle or the like comprising:
- a tube with a wall having a bore extending therethrough;
a razor-edged cutting blade extending transversely across the forward end of said tube, said blade having a generally "V" shape with a pair of razor-sharp cutting edges diverging rearwardly from a centrally-located needle-sharp point to opposite sides of the tube;
a pair of transversely-opposed smooth, tissue-spreading ribs located between the cutting edges and diverging rearwardly from said point to opposite sides of the tube;
forwardly open openings between the cutting edges and tissue-spreading ribs providing fluid flow passages extending rearwardly from the point to the rear ends of the ribs and communicating with said bore andthe transverse widths across the cutting edges and across the ribs progressively increasing from the point rearwardly at different rates to enable coincidental incising and spreading of tissue without pulling the ends of the incision apart and taut against the cutting edges.
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Abstract
A dialysis needle or the like comprises a tube with a razor edged cutting blade extending diametrically across its forward end. The blade has a generally "V" shape with a pair of razor sharp cutting edges converging forwardly from opposite sides of the tube and terminating in a needle-sharp point. A pair of diametrically opposed, smooth, tissue-spreading ribs are located in a plane normal to the cutting edges and converge forwardly from opposite sides of the tube to positions immediately rearwardly adjacent of the point. Two specific embodiments are described: an all-stainless-steel version; and a plastic version with a cutting blade insert.
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Citations
10 Claims
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1. A dialysis needle or the like comprising:
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a tube with a wall having a bore extending therethrough; a razor-edged cutting blade extending transversely across the forward end of said tube, said blade having a generally "V" shape with a pair of razor-sharp cutting edges diverging rearwardly from a centrally-located needle-sharp point to opposite sides of the tube; a pair of transversely-opposed smooth, tissue-spreading ribs located between the cutting edges and diverging rearwardly from said point to opposite sides of the tube; forwardly open openings between the cutting edges and tissue-spreading ribs providing fluid flow passages extending rearwardly from the point to the rear ends of the ribs and communicating with said bore and the transverse widths across the cutting edges and across the ribs progressively increasing from the point rearwardly at different rates to enable coincidental incising and spreading of tissue without pulling the ends of the incision apart and taut against the cutting edges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification