Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
227 words
An automatically operating apparatus for measuring blood pressure, comprising a patient''s cuff capable of being inflated, means inflating said cuff to diastolic and systolic blood pressure values of the person being examined, a member connected with said cuff for producing voltage impulses corresponding to the Korotkoff impulses, an amplifier connected with said member for Amplifying said voltage impulses, indicating means, an electrical operating device connected with said amplifier and said indicating means for automatically indicating diastolic and systolic blood pressure depending upon Korotkoff impulses during a cuff pressure cycle, two impulse treating channels connected in parallel to said amplifier, one of said channels comprising a filter connected to the amplifier and transmitting frequencies containing Korotkoff impulses, and a first impulse forming device connected to said filter, the other one of said channels comprising a second impulse forming device connected to said amplifier, the two impulse forming devices changing signals introduced into them into direct voltage impulses amplitudinally dependent upon Korotkoff impulses and total signal, a comparison device connected with the outlets of the two impulse forming devices, and an actuating device connected with said comparison device, said comparison device delivering an impulse to said actuating device when the outgoing values resulting from comparing the amplitudes of the outgoing signals of the impulse forming devices exceed a predetermined value which is characteristic for the appearance of Korotkoff impulses.
Claim 2
Dependent Claim
227 words
An automatically operating apparatus for measuring blood pressure, comprising a patient''s cuff capable of being inflated, means inflating said cuff to diastolic and systolic blood pressure values of the person being examined, a member connected with said cuff for producing voltage impulses corresponding to the Korotkoff impulses, an amplifier connected with said member for Amplifying said voltage impulses, indicating means, an electrical operating device connected with said amplifier and said indicating means for automatically indicating diastolic and systolic blood pressure depending upon Korotkoff impulses during a cuff pressure cycle, two impulse treating channels connected in parallel to said amplifier, one of said channels comprising a filter connected to the amplifier and transmitting frequencies containing Korotkoff impulses, and a first impulse forming device connected to said filter, the other one of said channels comprising a second impulse forming device connected to said amplifier, the two impulse forming devices changing signals introduced into them into direct voltage impulses amplitudinally dependent upon Korotkoff impulses and total signal, a comparison device connected with the outlets of the two impulse forming devices, and an actuating device connected with said comparison device, said comparison device delivering an impulse to said actuating device when the outgoing values resulting from comparing the amplitudes of the outgoing signals of the impulse forming devices exceed a predetermined value which is characteristic for the appearance of Korotkoff impulses.
Claim 3
Dependent Claim
85 words
An apparatus in accordance with claim 1, wherein said second impulse forming device comprises a rectifying device for rectifying impulses emitted by said amplifier and a charging step device connected in series with said rectifying device and comprising a condenser charged by appearing Korotkoff impulses with a small time constant as compared to the duration of a pulse and a resistance connected with said condenser for the following discharging of said condenser by a time constant large as compared to the duration of a pulse.
Claim 4
Dependent Claim
42 words
An apparatus in accordance with claim 3, comprising an amplifier and a diode, the last-mentioned amplifier and said diode connecting said rectifying device with said condenser, said valve permitting the passage only of such impulses which have the size of Korotkoff impulses.
Claim 5
Dependent Claim
63 words
An apparatus in accordance with claim 3, wherein the polarity of said rectifying device is such that the outgoing impulses of said impulse forming members have opposed polarity and wherein said comparison device comprises a threshold amplifier receiving the sum signal of the outgoing impulses and set to provide an actuating impulse only when a predetermined value of said sum signal is exceeded.
Claim 6
Dependent Claim
32 words
An apparatus in accordance with claim 1, wherein said first impulse forming device consists of an impulse integrator with two diodes and a differentiating step device connected in series with said integrator.