Cannula and method of manufacture and use
First Claim
1. A cannula for delivering fluid to or withdrawing fluid from a patient, the cannula comprising:
- a tubular body having a proximal end, a distal end, and at least one lumen;
wherein the tubular body has at least two reinforced sections having an elongate reinforcing member, the tubular body having at least two unreinforced sections which are substantially free of any reinforcing member and include at least one opening through which fluid passes.
2 Assignments
0 Petitions
Accused Products
Abstract
A cannula having reinforced sections and nonreinforced sections, the nonreinforced sections having openings communicating with the lumen of the cannula. The nonreinforced sections are plain tubing and the reinforced sections are formed by winding a coated elongate member in a helical manner around a mandrel. The coated elongate member preferably has a square cross-sectional shape so that adjacent portions of the coated elongate member engage one another when the coated elongate member is wound around the mandrel. The coated elongate member is then heated so that the coating on adjacent portions of the coated elongate member fuse together to form an integral structure. Another layer of material may be provided on the radially inner or outer wall of the coated elongate member. The resulting tubular body is reinforced by the elongate member which is encased in the fused coating. The tubular body is cut into sections which are fused to the plain tubing sections to form the cannula. The reinforced sections and the plain tubing sections are alternately disposed along all or a portion of the length of the cannula. The openings are formed in the plain tubing sections for withdrawing or delivering fluid into or out of the lumen of the cannula.
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Citations
14 Claims
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1. A cannula for delivering fluid to or withdrawing fluid from a patient, the cannula comprising:
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a tubular body having a proximal end, a distal end, and at least one lumen;
wherein the tubular body has at least two reinforced sections having an elongate reinforcing member, the tubular body having at least two unreinforced sections which are substantially free of any reinforcing member and include at least one opening through which fluid passes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of delivering fluid to a patient'"'"'s body, the method comprising the steps of:
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providing a cannula comprising a tubular body including a proximal portion, a distal portion, a central portion disposed between the proximal and distal portions, and a lumen;
wherein at least the distal portion and one of the central and proximal portions of the tubular body comprises a plurality of sections reinforced by an elongate reinforcing member encased in a material, the reinforced sections being separated by an unreinforced section which is substantially free of any reinforcing member and includes at least one opening extending into the lumen of the tubular body;
placing at least the distal portion of the cannula into a patient'"'"'s vascular system; and
delivering fluid to the patient'"'"'s vascular system by passing the fluid through the opening in the distal portion of the tubular body and the lumen, wherein the fluid is delivered to the patient'"'"'s vascular system through openings in the distal portion and through openings in at least one of the proximal and central portions of the tubular body and into the lumen. - View Dependent Claims (14)
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Specification