Systems and methods for detecting tissue contact and needle penetration depth using static fluid pressure measurements
First Claim
1. A system for detecting tissue contact and penetration depth comprising:
- a needle with a first end and a second end, said needle having a lumen and at least one aperture located a predetermined distance from said first end;
a fluid pressure measurement assembly coupled with a portion of said needle to measure pressure of a fluid dispensed in said needle, said pressure measurement assembly measuring a first pressure with said fluid dispensed in said needle, a second pressure when said needle contacts tissue and occludes said lumen before said aperture becomes occluded and a third pressure as said needle penetrates tissue and said aperture becomes occluded.
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Accused Products
Abstract
Systems and methods for determining tissue contact and penetration depth are provided. In one aspect, the system includes a needle and a pressure measurement assembly. The needle, in one exemplary embodiment, includes a first end and a second end with at least one aperture located a predetermined distance from the first end. The fluid pressure measurement assembly is connected with a portion of the needle to measure pressure of fluid dispensed in the needle. The fluid pressure measurement assembly measures a first pressure of the fluid, a second pressure when the needle contacts tissue and a third pressure when the needle penetrates the tissue and the aperture becomes occluded.
90 Citations
20 Claims
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1. A system for detecting tissue contact and penetration depth comprising:
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a needle with a first end and a second end, said needle having a lumen and at least one aperture located a predetermined distance from said first end;
a fluid pressure measurement assembly coupled with a portion of said needle to measure pressure of a fluid dispensed in said needle, said pressure measurement assembly measuring a first pressure with said fluid dispensed in said needle, a second pressure when said needle contacts tissue and occludes said lumen before said aperture becomes occluded and a third pressure as said needle penetrates tissue and said aperture becomes occluded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 20)
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13. A method of detecting tissue contact and a needle penetration depth of a needle used internally to deliver a therapeutic agent to a patient comprising:
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filling a needle with a therapeutic agent;
measuring a pressure of said therapeutic agent in said needle;
measuring a first change in pressure when said needle contacts tissue at a needle tip lumen; and
measuring a second change in pressure when said needle penetrates said tissue and occludes an aperture located a predetermined distance from said needle tip. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification