Apparatus and method for percutaneous catheterization
First Claim
1. A device for introducing a large bore diagnostic or therapeutic catheter into a body compartment or vessel, comprising a thin wall cannula of shape memory alloy having an inner diameter fashioned to embrace the shank of a hypodermic needle, said cannula exhibiting, in its martensitic phase, an outer diameter convenient for percutaneous puncture of a body compartment or vessel and exhibiting, in its austentitic beta-phase, an inner diameter to slidably accomodate the outer diameter of said large bore diagnostic or therapeutic catheter, and a dilatable elastomeric cylindrical sheath deployed over the surface of said cannula.
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Abstract
An apparatus for percutaneous catheterization of a vascular or other body compartment employs a shape memory alloy cylindrical cannula which expands after introduction into the body compartment with sufficient radial force to dilate the vascular member. A cylindrical plastic sheath embracing the cannula facilitates introduction and insulates the vascular compartment from contact with the metal of the cannula.
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Citations
10 Claims
- 1. A device for introducing a large bore diagnostic or therapeutic catheter into a body compartment or vessel, comprising a thin wall cannula of shape memory alloy having an inner diameter fashioned to embrace the shank of a hypodermic needle, said cannula exhibiting, in its martensitic phase, an outer diameter convenient for percutaneous puncture of a body compartment or vessel and exhibiting, in its austentitic beta-phase, an inner diameter to slidably accomodate the outer diameter of said large bore diagnostic or therapeutic catheter, and a dilatable elastomeric cylindrical sheath deployed over the surface of said cannula.
Specification