Damping device for circulatory pressure measuring apparatus
AssigneeSpectramed, Inc.
InventorJames E. Cole
Life of this patent
Estimating the term…
Abstract
A damping device for use in conjunction with a circulatory pressure measuring system to attenuate resonant pressure waves therein includes a series connector for connection to the pressure measuring system. An integrally connected parallel portion includes a capillary tube fluid resistance element in communication with the series connector. A flexible membrane isolates the capillary tube from a fixed volume gas chamber located adjacent the flexible membrane.
Claims10
A damping device for attenuating resonant frequency pressure waves in as circulatory pressure measuring system, comprising:
- a series connector;
- a fixed fluid resistance branch connector connected in parallel with said series connector;
- a substantially fixed volume gas cavity in proximity to said fixed fluid resistance connector;
- and means forming a flexible sealing member effective to extend the damping range of the device separating said fluid resistance branch connector from said gas cavity.
A damping device for attenuating resonant frequency pressure waves in a circulatory pressure measuring system, comprising:
- resistance means for providing a parallel fixed fluid resistance to a patient circuit of said blood pressure measuring system;
- capacitance means in communication with said resistance means for providing a fixed volume gas capacitance;
- and means forming a flexible partition adapted to extend the damping range of the device.
A damping device for use in conjunction with
- a circulatory pressure measuring apparatus to absorb selectively pressure waves having a frequency substantially equal to a resonant frequency of said circulatory pressure measuring apparatus, comprising:
- a series connector tube having a first end connector and a second end connector, said first end connector being connectable in series with a patient circuit portion of a circulatory pressure measuring apparatus in communication with a circulatory system of a patient, said second end connector being series connectable to a pressure measuring transducer so that a pressure wave transmitting path is defined between said patient and said pressure measuring transducer;
- a resonant energy bypass section formed integral with said series connector and having a bore defined therein;
- a capillary tube mounted within said bore;
- means forming a flexible elastic membrane enclosing the downstream end of said capillary tube and effective to extend the damping range of the device, a fluid reservoir connected in proximity with said flexible elastic membrane to receive pressure waves therefrom, said capillary tube having a diameter sized to act in conjunction with said membrane and said fluid reseervir so as to cause said damping device to be selectively excited by a resonant frequency of the circulatory pressure measuring apparatus and to attenuate the pressure waves of resonant frequency before they reach the pressure transducer.
A damping device for use in conjunction with a circulatory pressure measuring apparatus to absorb selectively pressure waves having a frequency substantially equal to a resonant frequency of said circulatory pressure measuring apparatus, as defined in claim 5, wherein said bore of said capillary tube is smaller than a bore of said patient circuit.
A damping device for use in conjunction with a circulatory pressure measuring apparatus to absorb selectively pressure waves having a frequency substantially equal to a resonant frequency of said circulatory pressure measuring apparatus, as defined in claim 5, wherein said series connector is formed integral with said first end connector and said second end connector.
A damping device for attenuating resonant frequency pressure waves in a circulatory pressure measuring system, comprising:
- fixed resistance passage means connected in parallel to a patient circuit of a circulatory pressure measuring system;
- a chamber containing a compliant, substantially fixed volume of gas in proximity to the downstream end of said fluid resistance passage means;
- and means forming a flexible, pressure conducting partition effective to extend the damping range of the device separating said fluid resistance passage means from said chamber.
A damping device for attenuating resonant frequency pressure waves in a circulatory pressure measuring system comprising:
- fluid resistance passage means comprising a capillary tube connected in parallel to a patient circuit of a circulatory pressure measuring system;
- fixed fluid capacitance means comprising a chamber containing a compliant, substantially fixed volume of gas in proximity to the downstream end of said fluid resistance means;
- and means forming a flexible, pressure conducting membrane effective to extend the damping range of the device separating said fluid resistance means from said fluid capacitance means.
Dependencies are inferred from the claim text.