Interference resistant biomedical transducer
Patent 4784154 Issued on November 15, 1988. Estimated Expiration Date: 
November 13, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 13, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1131741 2242756 3153123 3405288 3710465 3858575 3867925 3868954 Piezoelectric transducer having improved low frequency response Body vibration pickup InventorsAssigneeApplicationNo. 06/929988 filed on 11/13/1986US Classes:600/528, Detecting heart sound310/310, Friction310/358, Ceramic composition (e.g., barium titanate)381/190, Electrostrictive, magnetostrictive, or piezoelectric381/67, STETHOSCOPES, ELECTRICAL600/586Detecting sound generated within bodyExaminersPrimary: Kamm, William E.Assistant: Keegan, Timothy Attorney, Agent or FirmInternational ClassesA61B 7/04 (20060101)A61B 7/00 (20060101) AbstractAn interference resistant biomedical transducer for monitoring the acoustic output of a patient's cardiac or respiratory system which provides a high degree of rejection of acoustic noise and spurious electromagnetic signals. The transducer comprises a piezoelectric diaphragm assembly having electrodes which produce a differential output signal. The transducer housing includes a massive metal disc and a compliant handle which provide a mechanical filter to remove undesired signals such as those related to motion of the patient and ambient acoustic noise. | |
