US6599251B2 - Continuous Non-invasive Blood Pressure Monitoring Method And Apparatus - Google Patents > 자유게시판

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This invention relates to blood strain monitoring units of the kind which measure transit times of pulses in a topic's blood circulatory system and compute an estimated blood stress from the measured pulse transit instances. One method is to insert a pressure sensor immediately into a suitable artery in the topic. This strategy gives correct and painless SPO2 testing instantaneous blood pressure measurements. A surgical procedure is required to introduce the pressure sensor. The fistula by which the lead exits the topic's physique can provide a pathway for infection. Such devices are broadly used in hospitals and doctors' places of work for making routine blood stress measurements however are usually not properly tailored to providing steady blood pressure monitoring. Oscillometric blood stress measurements are made through the use of a transducer to detect and measure strain waves in a stress cuff as blood surges by an artery constricted by the strain cuff. Many at the moment accessible digital blood stress displays use the oscillometric methodology for BloodVitals wearable figuring out blood pressure.

30 seconds. Further, the cuff compresses underlying tissues. Over an prolonged time period this can cause tissue harm. Another problem with prior art PTT blood pressure measurements is that the connection between blood pressure and the time taken for pulses to transmit a portion of the blood circulatory system is different for each topic. Thus, it's essential to calibrate a PTT blood strain measurement system for every subject. ARTRACTM 7000 which used two photometric sensors, one on the ear and BloodVitals review another on a finger, to measure diastolic blood pressure. This system apparently used the distinction in arrived times of pulses at the ear and finger to measure the pulse transit time. This gadget apparently computed systolic strain from the pulse volume. This relationship, which is thought because the Moens-Korteweg-Hughes equation is described in additional detail under. Moens-Korteweg-Hughes equation depends on the elasticity and geometry of blood vessels and BloodVitals test is very nonlinear. This invention offers blood stress measurement methods and apparatus which keep away from some of the disadvantages of the prior artwork.

Preferred embodiments of the invention are appropriate for continuous non-invasive blood stress ("CNIBP") monitoring. One facet of the invention provides methods for monitoring blood stress. P zero , measuring the elapsed time T zero corresponding to the reference blood strain and figuring out values for both of the constants a and BloodVitals review b from P 0 and T 0 . P 0 and a corresponding time distinction T zero between the primary and second pulse signals; from the reference blood strain and corresponding time difference, determining a first plurality of fixed parameters in a multi-parameter equation relating blood pressure and BloodVitals the time-difference; monitoring the topic's blood strain by periodically measuring a time distinction T between the first and second pulse indicators; computing an estimated blood stress, P, from the time distinction, T, using the multi-parameter equation and the primary plurality of constant parameters. Three and c four are predetermined constants. T comprises measuring a first time difference T S for greater portions (ie parts corresponding usually to the elements of the alerts related to systolic blood strain) of the first and BloodVitals review second alerts.

Measuring the primary time distinction may comprise maximizing a cross-correlation between the primary and second pulse signals. Another side of the invention provides a technique for BloodVitals review estimating a blood stress of a topic. One more aspect of the invention offers a method for estimating the blood strain, P, of a topic. P, BloodVitals review of a subject. Yet another aspect of the invention offers a method for estimating the blood stress, P, of a topic. P zero and measuring a corresponding time distinction, T zero , between corresponding points of the first and second pulse signals; from the reference blood strain and BloodVitals review corresponding time difference, determining a plurality of fixed parameters in a multi-parameter equation relating blood pressure and the time difference by: determining a primary parameter of the plurality of parameters as a predetermined function of the corresponding time distinction; and, determining a second parameter of the plurality of parameters as a predetermined operate of the reference blood strain and the time difference; and, subsequently monitoring the subject's blood pressure by determining a time distinction, T, between corresponding factors of the primary and second pulse alerts and computing an estimated blood strain from the time distinction T using the multi-parameter equation and BloodVitals home monitor the primary and second parameters.