Device for guiding a surgical needle into a blood vessel
Patent 4527569 Issued on July 9, 1985. Estimated Expiration Date: 
November 15, 2003. 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 15, 2003. 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 2968302 3556079 Device for punctuating internal body organs, vessels or the like Patent #: 4346717 InventorAssigneeApplicationNo. 06/551724 filed on 11/15/1983US Classes:600/461, Associated with puncturing instrument604/116Having means for locating or identifying point where body is to be pierced (e.g., apertured body fitting template, etc.)ExaminersPrimary: Howell, Kyle L.Assistant: Jaworski, Francis J. Attorney, Agent or FirmInternational ClassesA61M 5/42 (20060101)A61M 5/32 (20060101) Foreign Application Priority Data1982-11-26 ZAAbstractA device for guiding a surgical needle (N) carried by a mount (30) into a blood vessel comprises receiving and transmitting ultrasonic transducers (26, 28). The transducers are positioned so that there is a point of convergence between the axis of the ultrasonic beam produced by the transmitting transducer and the axis of the line of sight along which the receiving transducer receives reflected waves. The mount (30) can perform both rotational and translational movements and the path along which the needle (N) moves when pushed into the patient intersects said point of convergence. The transducers (26, 28) and the mount (30) are interconnected so that movements of the needle mount (30) result in the transducers (26, 28) moving towards or away from one another so as to shift the point of convergence so that it remains coincident with the path along which the needle moves. In a further form the position of the needle mount is determined optically or magnetically and an output signal produced. The output signal is used to excite a phased array of ultrasonic transducers the outputs of which are arranged to interfere constructively along a specific axis. This axis is shifted as the needle mount is moved thereby to maintain the desired point of intersection between the line of sight of the receiving transducer, the axis along which the needle moves during insertion, and the axis along which constructive interference is occurring.Other References
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