Phoenix Ambulatory Blood Pressure Monitor Project
3/21/2004 Meeting Notes

 

Attendees
Edward Palmer
Franz Halberg
Germaine Cornelissen-Guillaume
Wade Peterson
El Nolley
Bob Schentz
Wu Jinyi, professor doctor from China, Wujinyi@hotmail.com

Discussion:
Franz - Software and reference database is the critical portion of this project, Germaine can help us with this.
Germaine - a box, telemetry, temperature sensor, can work fo rany other device, could work as a box in your pocket and records data from the sensor.

Wade: two projects.
* Oscillometric cuff ABPM | Project Champion: Bob Schlentz | Status: proposed project
* Blood flow velocity ABPM | Project Champion: Wade Peterson | Status: proposed project
* Sub-project: batteries | Status: active project
Wade project lead, description complete, no activity. 3 batteries identified, described. Eventually intended to be extended to more batteries and general power sources, and linked to their manufacturers and data sufficient to determine whether to use it or not.
- Sub-project: Piezo Film Blood Flow Sensor | Status: active project
Wade project lead, prototype design, parts on order (due Thursday 3/26), expect assembly & test results by next meeting 4/4.
- Sub-project: Optoelectric Blood Flow Sensor | Status: proposed project
Proposed project, no lead (need leader & volunteers).
- Sub-project: Piezo Film Body Motion Sensor | Status: proposed project
Proposed project, no lead yet - need leader and volunteers.

Discussion continued
Wade:
Foils and frequency range. Wade uses a little different technique. Uses Chen's technique and design around his claims.

Sub-projects:
* batteries
* Piezo Film Blood Flow Sensor
* Optoelectric Blood Flow Sensor
* Piezo Film Body Motion Sensor

Franz asked if we can arrange for some Russian work to be linked and perhaps translated.

Status
* batteries/power - Wade, project defined, look at batteries under one dollar, Uri & Curt are working one.
* Piezo Film Blood Flow Sensor
Wade designed a circuit that doesn't infringe on a patent, thus is suitable for placing in public domain as open source. Casio developed a watch bp monitor. Not easy to use and not sensitive enough with people with a weak pulse. It uses an infrared diode and a pulse sensor at $1.70 for the pair from DigiKey at www.digikey.com, Optek part numbers OP140A, OP550A.
* Optoelectric Blood Flow Sensor
* Piezo Film Body Motion Sensor

Webpage summary.
Patent page. '
Duke University, how to put information into the public domain.
Open collector. How to do Open Hardware projects.

 

Bob Schlentz:
Goal is to measure blood pressure, currently measuring indirectly and with a bp cuff. Omron sells it for $60.
What do we need?
* bp cuff for calibration
* manual sphymanometer
To calibrate and transfer to the computer.
Transfer of the artery, flow of blood, amt of oxygen, light, ultrasound, electrical device for impedance.
Consider a cyclic wave, identify peak max (systoli) and min (diastoli) as the intersection of positive and negative rise/fall slopes. So, we need to measure and analyze. Bob has seen equipment that has been used in measuring heart rate, placed on arm, with sensor and electronics. Another uses two sensors that measures "time of flight", measures change in diameter of artery. Depends on diameter of heart, valves in heart, occlusion, edema. Now use a slightly larger "patch" with an emitter and two sensors, and time depends on speed of flow, which depends on blood pressure, draws smaller battery current. Eg. Heart rate monitor batteries last a couple of months. Imagine a part of the world with moderate money,
Possibly: Sensor 1 is 4 cm wide x 4 cm long, and a distance between the sensors.

* In China, they have the current technology, but use the techniques of 100 years ago to measure bp. For example, they use 3 fingers - one strong pressure, one moderate pressure, one light pressure.

Next meeting, 4/4 2:30p.

 

 

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