Transducer apparatus for intravascular blood flow measurement

Details Transducer apparatus for intravascular blood flow measurement Transducer apparatus for intravascular blood flow measurement

2011-03-08

2011-03-08

Dougherty, Thomas M (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S334000, C310S366000, C310S367000, C029S025350, C600S454000

Reexamination Certificate

active

07902722

ABSTRACT:
A dual spiral transducer and method of manufacture of same is disclosed. In one aspect, the transducer comprises a central rod, a first spiral piezoelectric electrode wrapped around a circumference of the rod, the electrode being advanced around the rod at a determined angle determined based on a length of a single complete turn around the rod and a diameter of the rod and a second spiral piezoelectric electrode wrapped around the circumference of the rod, the second spiral electrode being electrically isolated, and offset, from the first spiral electrode by a known distance. A second set of spiral electrodes can be integrated into the structure so that both transmission and reception of signals is feasible.

REFERENCES:
patent: 3798474 (1974-03-01), Cassand et al.
patent: 4918666 (1990-04-01), Beauducel et al.
patent: 2004/0101150 (2004-05-01), Hooley et al.
patent: 2004/0135475 (2004-07-01), Omata et al.
patent: 56-131221 (1981-10-01), None

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