Collapse-resistant swellable catheter
First Claim
Patent Images
1. A collapse-resistant catheter comprising:
- an inner element including one or more indents; and
a flexible outer sleeve covering an outer wall of the inner element up to a distal end of the inner element, the flexible outer sleeve being non-slidable on the outer wall of the inner element;
wherein the inner element comprises a swellable material;
wherein the flexible outer sleeve comprises a non-swellable material; and
wherein after the collapse-resistant catheter is inserted at an infusion site and a liquid is administered via the collapse-resistant catheter, the inner element absorbs a portion of the liquid, the inner element swells in volume within the flexible outer sleeve, and the one or more indents control a direction of the swelling by causing the inner element to fold inwardly.
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Abstract
A catheter and method of making it are disclosed. The catheter includes a swellable inner element and a non-swellable outer sleeve covering an outer wall of the inner element. The inner element absorbs liquid from infusate administered through the catheter and swells in size. Outward swelling of the inner element is restrained by the non-swellable outer sleeve. The inventive catheter can be substituted for a conventional catheter that is used in an insulin infusion system.
86 Citations
20 Claims
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1. A collapse-resistant catheter comprising:
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an inner element including one or more indents; and a flexible outer sleeve covering an outer wall of the inner element up to a distal end of the inner element, the flexible outer sleeve being non-slidable on the outer wall of the inner element; wherein the inner element comprises a swellable material; wherein the flexible outer sleeve comprises a non-swellable material; and wherein after the collapse-resistant catheter is inserted at an infusion site and a liquid is administered via the collapse-resistant catheter, the inner element absorbs a portion of the liquid, the inner element swells in volume within the flexible outer sleeve, and the one or more indents control a direction of the swelling by causing the inner element to fold inwardly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of transferring liquid via a collapse-resistant catheter, comprising the steps of:
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providing a collapse-resistant catheter comprising a swellable inner element including one or more indents and a non-swellable outer sleeve externally covering an outer wall of the swellable inner element up to a distal end of the swellable inner element; inserting the collapse-resistant catheter into a patient using an introducer needle; removing the introducer needle from the collapse-resistant catheter; transferring liquid via the collapse-resistant catheter; absorbing liquid by the swellable inner element to cause swelling of the swellable inner element whereby the one or more indents control a direction of the swelling by causing the swellable inner element to fold inwardly; and restraining outward expansion of the swellable inner element by the externally covering non-swellable outer sleeve.
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18. A method of making a collapse-resistant catheter, comprising the steps of:
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forming an inner element including one or more indents by extruding a swellable material; forming a flexible outer sleeve by extruding a non-swellable polymeric material, the flexible outer sleeve being non-slidable on the inner element; inserting the inner element into the flexible outer sleeve; and shrinking the flexible outer sleeve over the inner element up to a distal end of the inner element to form the collapse-resistant catheter, wherein when the inner element absorbs liquid, the inner element swells and the one or more indents control a direction of the swelling by causing the inner element to fold inwardly. - View Dependent Claims (19, 20)
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Specification