Cervical dilation measurement instruments
Patent 4141345 Issued on February 27, 1979. Estimated Expiration Date: 
January 5, 1997. 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.
January 5, 1997. 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 2924220 3273559 3420222 Miniature muscle displacement transducer Patent #: 3937212 InventorsAssigneeApplicationNo. 05/756836 filed on 01/05/1977US Classes:600/591, Vagina or uterus33/512, Human606/119Obstetric or gynecological instrumentsExaminersPrimary: Howell, Kyle L.Attorney, Agent or FirmInternational ClassesA61B 5/107 (20060101)G01B 7/14 (20060101) Foreign Application Priority Data1976-01-08 GBAbstractCervical dilation is measured by a V-shaped caliper instrument having connectors on the free ends of the caliper arms for securement to respectively opposed portions of the cervix, and a transducer coupled with the arms to provide an electric signal representing their mutually relative positions. The transducer suitably comprises strain gages mounted on a spring acting between the arms. The connectors can be toothed spring clips pivoted on the arms, but are preferably pins projecting generally parallel to the arms from the underfaces of outwardly turned free end portions thereof. In the latter case the arms preferably have spring guard strips extending alongside their outer faces at their ends. | |
