Automatic recording sphygmomanometer

Claim 1

An apparatus for measuring and recording blood pressure comprising: a. an inflatable cuff adapted to be applied to the upper third of a limb and having inflating means for inflating said cuff for selectively occluding the flow of blood to the limb; b. a microphone positioned within said cuff capable of detecting Korotkoff sounds occurring within the limb as the pressure in said cuff is reduced; c. electronic circuit means mounted in a housing and connected electrically to said microphone for amplifying and discriminating the signals emanating from said microphone for emitting a digital output signal for each Korotkoff sound; d. a recording device having a stationary record medium and stylus means which is operable therewith, said recording device being electrically connected to said circuit means, and said stylus means being operable upon actuation by the digital pulses emanating from said circuit means for imprinting a single mark on said stationary record medium for each Korotkoff sound; means mechanically coupled with said stylus means for moving e. stylus means relative to said record medium in synchronism with falling cuff pressure such that the position of said stylus means is specifically determined by the pressure in said cuff; f. an adjustable indicating means for indicating inflation of said cuff to a pre-determined pressure above the anticipated systolic blood pressure, said adjustable indicating means being mounted in said housing and connected to said means for moving said stylus means; g. multi-position pneumatic bleed valve means selectively conditionable in a ontrolled-sLow-leak mode for venting of said cuff during the measurement, in a gross venting mode for releasing the pressure from said cuff when the measurement is completed, and in a sealed mode during inflation of said cuff, said valve means being mounted in said housing and connected pneumatically to said cuff; h. multi-position electrical switch means selectively conditionable in a first mode for actuating said indicating means to indicate when the pre-determined cuff inflation pressure has been attained while preventing said stylus means from being actuated, in a second mode to deactivate the said indicating means, and to permit said stylus means to imprint a record of said medium, and a third mode to deactivate said circuit means and said indicating means to disconnect all electrical functions, said switch means being mounted in said housing and connected to said circuit means and to said indicating means; and i. a stationary dial graduated in units of pressure mounted adjacent said record medium to permit interpretation of the marks recorded on said record medium.

Claim 2

An apparatus for measuring and recording blood pressure comprising: a. an inflatable cuff adapted to be applied to the upper third of a limb and having inflating means for inflating said cuff for selectively occluding the flow of blood to the limb; b. a microphone positioned within said cuff capable of detecting Korotkoff sounds occurring within the limb as the pressure in said cuff is reduced; c. electronic circuit means mounted in a housing and connected electrically to said microphone for amplifying and discriminating the signals emanating from said microphone for emitting a digital output signal for each Korotkoff sound; d. a recording device having a stationary record medium and stylus means which is operable therewith, said recording device being electrically connected to said circuit means, and said stylus means being operable upon actuation by the digital pulses emanating from said circuit means for imprinting a single mark on said stationary record medium for each Korotkoff sound; means mechanically coupled with said stylus means for moving e. stylus means relative to said record medium in synchronism with falling cuff pressure such that the position of said stylus means is specifically determined by the pressure in said cuff; f. an adjustable indicating means for indicating inflation of said cuff to a pre-determined pressure above the anticipated systolic blood pressure, said adjustable indicating means being mounted in said housing and connected to said means for moving said stylus means; g. multi-position pneumatic bleed valve means selectively conditionable in a ontrolled-sLow-leak mode for venting of said cuff during the measurement, in a gross venting mode for releasing the pressure from said cuff when the measurement is completed, and in a sealed mode during inflation of said cuff, said valve means being mounted in said housing and connected pneumatically to said cuff; h. multi-position electrical switch means selectively conditionable in a first mode for actuating said indicating means to indicate when the pre-determined cuff inflation pressure has been attained while preventing said stylus means from being actuated, in a second mode to deactivate the said indicating means, and to permit said stylus means to imprint a record of said medium, and a third mode to deactivate said circuit means and said indicating means to disconnect all electrical functions, said switch means being mounted in said housing and connected to said circuit means and to said indicating means; and i. a stationary dial graduated in units of pressure mounted adjacent said record medium to permit interpretation of the marks recorded on said record medium.