Apparatus for control of non-invasive parameter measurements
First Claim
1. A non-invasive and continuous blood pressure measurement apparatus, comprising:
- a non-invasive pressure sensor coupled to an applanation apparatus, said applanation apparatus controlled at least in part by a computing apparatus adapted to collect hemodynamic data from said sensor, said computing apparatus capable of operating in a plurality of modes, said plurality of modes comprising;
a first mode, wherein blood pressure data is obtained via said sensor from the circulatory system of a living subject;
a second mode, wherein at least one transient event is detected based on said blood pressure data; and
eithera third mode subsequent to said detection of said event if said event is determined not to be of sufficient severity that recovery from said event in said second mode would exceed a first criterion;
ora fourth mode subsequent to said detection if said event is determined to be of sufficient severity that recovery from said event in said second mode would exceed said first criterion.
10 Assignments
0 Petitions
Accused Products
Abstract
Improved methods and apparatus for non-invasively assessing one or more parameters associated with fluidic systems such as the circulatory system of a living organism. In a first aspect, an improved method of continuously measuring pressure from a compressible vessel is disclosed, wherein a substantially optimal level of compression for the vessel is achieved and maintained using perturbations (e.g., modulation) of the compression level of the vessel. In one exemplary embodiment, the modulation is conducted according to a pseudo-random binary sequence (PBRS). In a second aspect, an improved apparatus for determining the blood pressure of a living subject is disclosed, the apparatus generally comprising a pressure sensor and associated processor with a computer program defining a plurality of operating states related to the sensed pressure data. Methods for pressure waveform correction and reacquisition, as well as treatment using the present invention, are also disclosed.
52 Citations
32 Claims
-
1. A non-invasive and continuous blood pressure measurement apparatus, comprising:
-
a non-invasive pressure sensor coupled to an applanation apparatus, said applanation apparatus controlled at least in part by a computing apparatus adapted to collect hemodynamic data from said sensor, said computing apparatus capable of operating in a plurality of modes, said plurality of modes comprising; a first mode, wherein blood pressure data is obtained via said sensor from the circulatory system of a living subject; a second mode, wherein at least one transient event is detected based on said blood pressure data; and
eithera third mode subsequent to said detection of said event if said event is determined not to be of sufficient severity that recovery from said event in said second mode would exceed a first criterion;
ora fourth mode subsequent to said detection if said event is determined to be of sufficient severity that recovery from said event in said second mode would exceed said first criterion. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A non-invasive hemodynamic measurement system, comprising:
-
a pressure sensor adapted to measure pressure data originating from an artery of a living subject; an applanation apparatus operatively coupled to said pressure sensor; a controller in signal communication with said sensor and said applanation apparatus, said controller capable of (i) detecting at least one transient event within hemodynamic data obtained from said sensor, and (ii) operating in a plurality of modes, said modes comprising; a first mode, wherein hemodynamic data is obtained from said sensor; a second mode, entered subsequent to said detection of said event if said event does not have a first characteristic; and a third mode, entered subsequent to said detection if said event has said first characteristic; wherein said first characteristic comprises parameters indicating that said event is not (a) physiologic in origin, and (b) of sufficient magnitude that recovery from said event in said second mode would exceed a first criterion. - View Dependent Claims (7, 8, 9)
-
-
10. A non-invasive hemodynamic measurement system, comprising:
-
a pressure sensor adapted to measure pressure data originating from an artery of a living subject; an applanation apparatus operatively coupled to said pressure sensor; a controller in signal communication with said sensor and said applanation apparatus, said controller capable of (i) identifying at least one artifact within a waveform related to hemodynamic data obtained from said sensor, said artifact indicating at least one a motion initiated by a subject from which said hemodynamic data is being obtained, and (ii) operating in a plurality of modes, said modes comprising; a first mode, wherein hemodynamic data is obtained from said sensor; a second mode, entered subsequent to said detection of said event if said event does not have a first characteristic; and a third mode, entered subsequent to said detection if said event has said first characteristic. - View Dependent Claims (11, 12, 13)
-
-
14. A non-invasive hemodynamic measurement system, comprising:
-
a non-invasive sensor adapted to obtain hemodynamic data; an applanation mechanism; and a controller apparatus, said controller apparatus in signal communication with said sensor and adapted to detect at least one transient event within said hemodynamic data; wherein; said hemodynamic data is obtained in a non-transient mode of operation; and in a transient recovery mode entered into by said system subsequent to said detection of said event, a control signal generated by said controller causes said applanation mechanism to modulate compression applied to a blood vessel from which said hemodynamic data is obtained according to a substantially randomized sequence. - View Dependent Claims (15, 16, 17, 18)
-
-
19. An apparatus for use in transient event compensation during hemodynamic parameter measurement from a compressible blood vessel, comprising:
-
applanation apparatus adapted to establish an initial substantially optimal level of compression of said blood vessel for at least a first epoch; a pressure sensor adapted to measure pressure data from said blood vessel; and a computing apparatus having a computer program running thereon, said computer program adapted to receive pressure data from said pressure sensor and detect the occurrence of a transient event by analyzing changes in said pressure data, said transient event altering the mechanical coupling between said blood vessel and said sensor; wherein said computing apparatus initiates a pressure sweep to identify a second substantially optimal level of compression of said blood vessel based on said altered coupling when said transient event has substantially subsided; and wherein said computing apparatus controls said applanation apparatus to establish the second substantially optimal level of compression of said blood vessel for at least a second epoch. - View Dependent Claims (20, 21, 22, 23, 24)
-
-
25. A non-invasive hemodynamic measurement system, comprising:
-
an applanation mechanism adapted to be controlled by a processing apparatus; and a hemodynamic sensor adapted to obtain hemodynamic data from a blood vessel of a living subject for use by at least said processing apparatus; wherein said processing apparatus is adapted to operate the system in at least two modes, said at least two modes comprising; a servo mode, wherein hemodynamic data is obtained by said system; and a transient recovery mode initiated by said processing apparatus subsequent to the detection of at least one transient event within said hemodynamic data, said transient recovery mode being adapted to;
(i) perform an applanation sweep of said blood vessel using said applanation mechanism, and (ii) return said system to said servo mode; andwherein said servo mode further comprises continuously identifying time varying changes in compression coupling, and controllably adjusting an applanation position accordingly. - View Dependent Claims (26, 27, 28)
-
-
29. A non-invasive hemodynamic measurement apparatus, comprising:
-
applanation means adapted to be controlled by a processing apparatus; and hemodynamic sensor means adapted to obtain hemodynamic data from a blood vessel of a living subject for use by at least said processing apparatus; wherein said processing apparatus is adapted to operate the system in at least two modes, said at least two modes comprising; a first mode, wherein hemodynamic data is obtained by said hemodynamic measurement apparatus; and a second mode initiated by said processing apparatus subsequent to the detection of at least one transient event within said hemodynamic data, said second mode being adapted to;
(i) perform an applanation sweep of said blood vessel using said applanation means, and (ii) return said system to said first mode; andwherein said first mode further comprises substantially continuously identifying time varying changes in compression coupling, and controllably adjusting said applanation means accordingly. - View Dependent Claims (30, 31, 32)
-
Specification