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US 6,709,428 B2Granted
Needle design and manufacturing method for medical applications
AssigneeBaxter International Inc.
InventorWilliam E. Sagstetter
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a novel process for inserting a cannula into a hub member. The process uses an interference or frictional fit between the bore of the hub member and the cannula's exterior surface. In this manner, adhesives are not required in the assembly of the two components.
Claims113
A medical device, comprising:
- (a) a hypodermic needle having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the needle being received in the bore, wherein the bore has a radius such that an interference fit exists between the exterior surface of the needle located in the bore and the surface of the bore and wherein the hub bore is substantially free of an adhesive.
A medical device, comprising:
- (a) a hypodermic needle having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the needle being received in the bore, wherein the bore is substantially free of adhesive.
A medical device, comprising:
- (a) a cannula having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the cannula being received in the bore, wherein the bore has a radius such that an interference fit exists between the exterior surface of the cannula located in the bore and the surface of the bore and wherein the roughened portion has a radius and the radius is from about 2.5 to about 30% more than the radius of the substantially smooth portion.
A medical device, comprising:
- (a) a cannula having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the cannula being received in the bore, wherein the bore has a radius such that an interference fit exists between the exterior surface of the cannula located in the bore and the surface of the bore, wherein the hub member is formed from a material having a flex modulus ranging from about 200,000 psi to about 500,000 psi, and wherein the hub bore is substantially free of an adhesive.
A medical device, comprising:
- (a) a cannula having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the cannula being received in the bore, wherein the bore has a radius such that an interference fit exists between the exterior surface of the cannula located in the bore and the surface of the bore and wherein the radius of the hub bore is from about 75 to about 99% of the second radius.
A medical device, comprising:
- (a) a cannula having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the cannula being received in the bore, wherein the bore has a radius such that an interference fit exists between the exterior surface of the cannula located in the bore and the surface of the bore,
- wherein the cannula is hypodermic needle, and wherein the radius of the hub bore is from about 100 to about 125% of the radius of the substantially smooth portion of the cannula.
1 more element
A medical device, comprising:
- (a) a cannula having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the cannula being received in the bore, wherein the bore is substantially free of adhesive and wherein the roughened portion has a radius and the radius is from about 2.5 to about 30% more than the radius of the substantially smooth portion.
A medical device, comprising:
- (a) a cannula having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the cannula being received in the bore, wherein the bore is substantially free of adhesive and wherein the hub member is formed from a material having a flex modulus ranging from about 200,000 psi to about 500,000 psi.
A medical device, comprising:
- (a) a cannula having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the cannula being received in the bore, wherein the bore is substantially free of adhesive and wherein the radius of the hub bore is from about 75 to about 99% of the second radius.
A medical device, comprising:
- (a) a cannula having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the cannula being received in the bore, wherein the bore is substantially free of adhesive, wherein the cannula is a hypodermic needle, and wherein the radius of the hub bore is from about 100 to about 125% of the radius of the substantially smooth portion of the cannula.
A medical device, comprising:
- (a) a hypodermic needle having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the needle being received in the bore, wherein the bore has a radius such that an interference fit exists between the exterior surface of the needle located in the bore and the surface of the bore wherein the radius of the roughened portion is at least about 0.0001 inches more than the radius of the hub bore.
A medical device, comprising:
- (a) a hypodermic needle having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the needle being received in the bore, wherein the bore has a radius such that an interference fit exists between the exterior surface of the needle located in the bore and the surface of the bore, wherein the hub member possesses a plurality of ribs, said plurality of ribs extending from said hub bore such that said plurality of ribs lessen lateral forces applied to said needle.
A medical device, comprising:
- (a) a hypodermic needle having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the needle being received in the bore, wherein the bore is substantially free of adhesive, wherein the radius of the roughened portion is at least about 0.0001 inches more than the radius of the hub bore.
A medical device, comprising:
- (a) a hypodermic needle having an exterior surface, with a roughened portion of the exterior surface being roughened and having a radius and a substantially smooth portion of the exterior surface being substantially smooth and having a radius;
- and
- (b) a hub member having a bore, at least the roughened portion of the needle being received in the bore, wherein the bore is substantially free of adhesive, wherein the radius of the roughened portion is at least about 0.0001 inches more than the radius of the hub bore, wherein the hub member possess a plurality of ribs, said plurality of ribs extending from said hub bore such that said plurality of ribs lessen lateral forces applied to said needle.
Dependencies are inferred from the claim text.