Constant pressure implantable pump reservoir
First Claim
Patent Images
1. An implantable pump reservoir comprising:
- a housing having an internal chamber of variable volume, at least a deformable shape memory alloy component to apply a contracting force reducing the volume of said housing and;
means providing access to said chamber whereby when said chamber is filled with a material said shape memory alloy is stressed so that said material is released by the application of said contracting force.
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Abstract
An implantable device uses shape memory alloy (SMA) as the driver to compress a reservoir thereby providing a constant pressure source fluid delivery device. The SMA may form either the reservoir itself by appropriate shaped sheets or it may form bands around a flexible reservoir member. The reservoir may also be formed of rigid members pivoted or clamped using SMA actuators to bias the rigid members together.
319 Citations
20 Claims
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1. An implantable pump reservoir comprising:
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a housing having an internal chamber of variable volume, at least a deformable shape memory alloy component to apply a contracting force reducing the volume of said housing and; means providing access to said chamber whereby when said chamber is filled with a material said shape memory alloy is stressed so that said material is released by the application of said contracting force. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An implantable drug infusion system comprising;
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a housing including a shape memory alloy to apply a contractive force, a variable volume chamber within said housing, and means establishing fluid communication to said chamber, wherein as said chamber is filled with a drug to be infused and said shape memory alloy is stressed to provide a relatively constant compressive force to said housing thereby reducing the volume of said chamber and expelling said drug. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification