1. A method for monitoring blood pressure of a patient under high motion conditions, comprising:
securing a sensor assembly to a monitoring site on an anatomical structure of the patient from which noninvasive monitoring of blood pressure may be performed, the sensor assembly having a sensor with a main pressure channel and a reference pressure channel;
applying the sensor to the monitoring site with a varying holddown force over a plurality of sequential cycles comprising an initial sequence of a predetermined number of cycles and a subsequent sequence;
attempting to maintain low motion conditions over the initial sequence of the applying step;
acquiring main waveform data from the main pressure channel and reference waveform data from the reference pressure channel during the applying step;
monitoring at least one of the main waveform data and the reference waveform data to detect a fault in the initial sequence of the applying step;
monitoring a user-activated restart control to detect a restart signal during the initial sequence of the applying step; and
when no fault is detected in the waveform data monitoring step, and when no restart signal is detected in the reset control monitoring step, calculating blood pressure from the main and reference waveform data acquired in the subsequent sequence of the applying step and from at least one cycle of the initial sequence after filtration thereof with respective high pass filters, an adaptive noise canceller, and an adaptive linear predictor.
2. The method of claim 1 wherein:
the sensor assembly securing step comprises securing the sensor assembly to a wrist of the patient with the sensor aligned to a distal edge of a radius bone of the wrist and over an artery;
activating the user-activated restart control when the wrist of the patient is observed to undergo motion; and
restarting the acquiring step.
3. The method of claim 1 further comprising:
detecting a fault when (1) a safety limit holddown pressure exceeds 280 mmHg; (2) a calculated systolic rate value exceeds 600 mmHg; (3) a calculated diastolic rate value exceeds 600 mmHg; (4) a calculated mean rate value exceeds 600 mmHg; (5) a calculated systolic rate value is not greater than a calculated diastolic rate value; (6) a calculated systolic rate value is not greater than a calculated mean value; (7) a calculated diastolic rate value is not less than a calculated systolic rate value and a calculated mean value; (8) a calculated diastolic rate value is zero or less; (9) a calculated mean value is less than a calculated diastolic rate value; or (10) a calculated mean value is less than a calculated systolic rate value; and
restarting the acquiring step.
4. The method of claim 1 wherein:
the sensor assembly securing step comprises securing the sensor assembly to a wrist of the patient with the sensor aligned to a distal edge of a radius bone of the wrist and over an artery;
activating the user-activated restart control when the wrist of the patient is observed to undergo motion;
detecting a fault when (1) a safety limit holddown pressure exceeds 280 mmHg; (2) a calculated systolic rate value exceeds 600 mmHg; (3) a calculated diastolic rate value exceeds 600 mmHg; (4) a calculated: mean rate value exceeds 600 mmHg; (5) a calculated systolic rate value is not greater than a calculated diastolic rate value; (6) a calculated systolic rate value is not greater than a calculated mean value; (7) a calculated diastolic rate value is not less than a calculated systolic rate value and a calculated mean value; (8) a calculated diastolic rate value is zero or less; (9) a calculated mean value is less than a calculated diastolic rate value; or (10) a calculated mean value is less than a calculated systolic rate value; and
restarting the acquiring step upon occurrence of either the user-activated restart control activating step or the fault detecting step.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An HVAC system for a work vehicle having an operator cab comprising:
a first chamber having an inlet for receiving a flow of air exterior of the cab and an outlet, the inlet adjacent to a first source for moving air for use independent of the HVAC system, the inlet arranged to cause a first change of direction of airflow inside the first chamber, the first chamber resulting in both a first air pressure reduction and a first reduction of airflow velocity while inside the first chamber sufficient to reduce an amount of particles entrained in the airflow while the particles are within the first chamber;
a conduit in fluid communication between the outlet of the first chamber and an inlet of a second chamber, the second chamber configured to cause both a second change of direction and a third change of direction of airflow while inside of the second chamber;
a third chamber configured to receive airflow from an outlet of the second chamber and to receive recirculated air from within the cab, the recirculated air brought into selective thermal heat exchange with a heat exchanger of the HVAC system by a second source for moving air, the recirculated air then entering the third chamber via an opening formed in the third chamber, the recirculated air and the airflow entering the third chamber from the second chamber mixing together; and
a filter positioned interior of the cab and in fluid communication with the third chamber to remove at least a portion of remaining particles entrained in the mixed airflow.
2. The HVAC system of claim 1, wherein the first source for moving air is associated with cooling a motor of the work vehicle.
3. The HVAC system of claim 1, wherein the first chamber is located substantially exterior of the work vehicle.
4. The HVAC system of claim 3, wherein the first chamber comprises an aperture to remove particles from the first chamber.
5. The HVAC system of claim 4, wherein the opening in the third chamber comprises louvers facing away from an operator.
6. The HVAC system of claim 5, wherein the louvers face aft of the operator.
7. The HVAC system of claim 1, wherein the filter is positioned beneath the third chamber.
8. The HVAC system of claim 1, wherein the second change of direction of the airflow is about 90 degrees.
9. The HVAC system of claim 1, wherein the third change of direction of the airflow is about 90 degrees.
10. The HVAC system of claim 1, wherein the first chamber is removable from exterior of the cab.
11. A work vehicle comprising:
a motor secured to a frame for activating a driving device for selectably moving the frame;
an operator cab supported by the frame;
an HVAC system for a work vehicle having an operator cab comprising:
a first chamber having an inlet for receiving a flow of air exterior of the cab and an outlet, the inlet adjacent to a first source for moving air for use independent of the HVAC system, the inlet arranged to cause a first change of direction of airflow inside the first chamber, the first chamber resulting in both a first air pressure reduction and a first reduction of airflow velocity while inside the first chamber sufficient to reduce an amount of particles entrained in the airflow while the particles are within the first chamber;
a conduit in fluid communication between the outlet of the first chamber and an inlet of a second chamber, the second chamber configured to cause both a second change of direction and a third change of direction of airflow while inside of the second chamber;
a third chamber configured to receive airflow from an outlet of the second chamber and to receive recirculated air from within the cab, the recirculated air brought into selective thermal heat exchange with a heat exchanger of the HVAC system by a second source for moving air, the recirculated air then entering the third chamber via an opening formed in the third chamber, the recirculated air and the airflow entering the third chamber from the second chamber mixing together; and
a filter positioned interior of the cab and in fluid communication with the third chamber to remove at least a portion of remaining particles entrained in the mixed airflow.
12. The work vehicle of claim 11, wherein the first source for moving air is associated with cooling a motor of the work vehicle.
13. The work vehicle of claim 11, wherein the first chamber is located substantially exterior of the work vehicle.
14. The work vehicle of claim 13, wherein the first chamber comprises an aperture to remove particles from the first chamber.
15. The work vehicle of claim 14, wherein the opening in the third chamber comprises louvers facing away from an operator.
16. The work vehicle of claim 15, wherein the louvers face aft of the operator.
17. The work vehicle of claim 11, wherein the filter is positioned beneath the third chamber.
18. The work vehicle of claim 11, wherein the second change of direction of the airflow is about 90 degrees.
19. The work vehicle of claim 11, wherein the third change of direction of the airflow is about 90 degrees.
20. A work vehicle comprising:
a motor secured to a frame for selectably moving the frame;
a operator cab supported by the frame;
an HVAC system for a work vehicle having an operator cab comprising:
a first chamber having an inlet for receiving a flow of air exterior of the cab and an outlet, the inlet adjacent to a first source for moving air for use independent of the HVAC system, the inlet arranged to cause a first change of direction of airflow inside the first chamber, the first chamber resulting in both a first air pressure reduction and a first reduction of air velocity while inside the first chamber sufficient to reduce an amount of particles entrained in the airflow while the particles are within the first chamber;
a conduit in fluid communication between the outlet of the first chamber and an inlet of a second chamber, the second chamber configured to cause both a second change of direction of airflow of about 90 degrees and a third change of direction of airflow of about 90 degrees while inside of the second chamber;
a third chamber configured to receive airflow from an outlet of the second chamber and to receive recirculated air from within the cab, the recirculated air brought into selective thermal heat exchange with a heat exchanger of the HVAC system by a second source for moving air, the recirculated air then entering the third chamber via an opening formed in the third chamber, the opening in the third chamber comprises louvers facing away from an operator, the recirculated air and the airflow entering the third chamber from the second chamber mixing together; and
a filter positioned interior of the cab and in fluid communication with the third chamber to remove at least a portion of remaining particles entrained in the mixed airflow.