Subcutaneous injection set with crimp-free soft cannula
First Claim
1. A subcutaneous injection set, comprising:
- housing means defining an internal chamber adapted for receiving a selected infusion fluid, said housing means further defining an outlet bore;
a soft cannula mounted generally within said outlet bore and protruding outwardly from said housing, said cannula defining a hollow lumen;
an insertion needle removably received through said housing chamber and further through said cannula lumen and terminating in a point tip disposed at least slightly beyond said cannula, said insertion needle being withdrawable from said cannula and from said housing subsequent to transcutaneous placement of said cannula through the skin of a patient; and
means for preventing slippage of said cannula in a direction longitudinally along said insertion needle during transcutaneous placement thereof to correspondingly prevent cannula crimping.
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Accused Products
Abstract
A device for use as a subcutaneous injection set is disclosed which has a soft cannula through which a selected medication can be administered to a patient, wherein the soft cannula is adapted for transcutaneous placement by an insertion needle substantially without crimping or kinking. The cannula is supported by and protrudes outwardly from a housing adapted to receive the selected medication. The insertion needle is initially inserted through a septum on the housing and further through the cannula to provide a rigid structure to insert the soft cannula through the patient'"'"'s skin. The insertion needle and cannula are constructed to prevent longitudinal slippage of the cannula on the needle during the insertion process, thereby preventing undesired crimping or kinking of the soft cannula. After insertion, the needle is withdrawn from the cannula and housing to permit medication delivery to the patient.
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Citations
21 Claims
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1. A subcutaneous injection set, comprising:
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housing means defining an internal chamber adapted for receiving a selected infusion fluid, said housing means further defining an outlet bore; a soft cannula mounted generally within said outlet bore and protruding outwardly from said housing, said cannula defining a hollow lumen; an insertion needle removably received through said housing chamber and further through said cannula lumen and terminating in a point tip disposed at least slightly beyond said cannula, said insertion needle being withdrawable from said cannula and from said housing subsequent to transcutaneous placement of said cannula through the skin of a patient; and means for preventing slippage of said cannula in a direction longitudinally along said insertion needle during transcutaneous placement thereof to correspondingly prevent cannula crimping. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a transcutaneous medical fluid infusion device having a soft cannula defining a hollow lumen and an insertion needle extending through said cannula with a pointed tip disposed at least slightly beyond a distal end of the cannula, wherein the needle provides a rigid backstop structure for transcutaneous cannula placement and is thereafter withdrawable from the cannula to permit medical fluid infusion through said lumen, the improvement comprising:
means for preventing slippage of said cannula in a direction longitudinally along said insertion needle during transcutaneous placement thereof to correspondingly prevent cannula crimping. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of making a subcutaneous injection set, comprising:
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defining an internal chamber in a housing means, said internal chamber being adapted for receiving a selected infusion fluid; defining an outlet bore in said housing means; mounting a soft cannula generally within said outlet bore, said soft cannula protruding outwardly from said housing, said soft cannula defining a hollow lumen therein; removably placing an insertion needle through said housing chamber and further through said cannula lumen, said insertion needle terminating in a point tip disposed at least slightly beyond said cannula, said insertion needle being withdrawable from said cannula and from said housing subsequent to transcutaneous placement of said cannula through the skin of a patient; and providing means for preventing slippage of said cannula in a direction longitudinally along said insertion needle during transcutaneous placement thereof to correspondingly prevent cannula crimping.
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Specification