Inductive plethysmography

Respiratory inductance plethysmography is a method of evaluating pulmonary ventilation by measuring the movement of the chest and abdominal wall. Accurate measurement of pulmonary ventilation or breathing often requires the use of devices such as masks or mouthpieces coupled to the airway opening.

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1. WEARABLE SYSTEM
Inductive
plethysmography
Sensors
01

2. Topics of this
Presentation
WEARABLE SYSTEM
What is Plethysmograph?
Meaning
Inductive Plethysmograph
Two Bands
Dual Band
Single Band
Accuracy
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2.
3.
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3. It is an instrument for
measuring changes in
volume within an organ
or whole body (usually
resulting from
fluctuations in the
amount of blood or air it
contains)
What is
Plethysmography?
WEARABLE SYSTEM
03

4. Wearable Systems
04
Meaning of the word
'Plethysmography'
The word is derived from
the Greek "plethysmos"
(increasing, enlarging,
becoming full), and
"graphos" (to write).

5. WEARABLE SYSTEM
Plethysmography is
especially effective in
detecting changes
caused by blood flow.
05
Plethysmography

6. What is Respiratory
inductance
plethysmography?
It is a method of evaluating
pulmonary ventilation by
measuring the movement of
the chest and abdominal
wall.
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7. A respiratory inductance plethysmograph consists of
two sinusoid wire coils insulated and placed within two 2.5 cm
(about 1 inch) wide, lightweight elastic and adhesive bands.

The transducer bands are placed around the rib cage under the
armpits and around the abdomen at the level of
the umbilicus (belly button).

They are connected to an oscillator and subsequent
frequency demodulation electronics to obtain digital waveforms.
07
CONSTRUCTION

8. During inspiration the cross-sectional area of the rib cage and
abdomen increases altering the self-inductance of the coils and
the frequency of their oscillation, with the increase in cross-
sectional area proportional to lung volumes.

The electronics convert this change in frequency to a digital
respiration waveform where the amplitude of the waveform is
proportional to the inspired breath volume.
07
PROCESS

9. Two Band
Respiration
WEARABLE SYSTEMS
Single Band Respiration
Dual Band Respiration
1.
2.
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10. 10
With this model, tidal
volume (Vt) was calculated
as the sum of the
anteroposterior dimensions
of the rib cage and
abdomen, and could be
measured to within 10% of
actual Vt as long as a given
posture was maintained.

Dual Band
Respiration

11. 10
Due to differences in posture and thoraco-abdominal respiratory
synchronization it is not possible to obtain accurate respiratory volumes
with a single band.

Therefore, to accurately perform volumetric respiratory measurements,
a dual band respiratory sensor system must be required.

Single
Band Respiration

12. 10

DATA ANALYSIS

13. 11
Dual band respiratory inductance plethysmography can
be used to describe various measures of complex
respiratory patterns. The image shows waveforms and
measures commonly analyzed.
Respiration Rate
Tidal Volume
Minute Ventilation
Peak Inspiratory Flow
Fractional Inspiratory Time
Peak/mean inspiratory and expiratory flow
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2.
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Wearable Systems
DATA ANALYSIS

14. WREARABLE SYSTEM
Dual band respiratory inductance plethysmography
was validated in determining tidal volume during
exercise and shown to be accurate.

A version of RESPIRATORY INDUCTIVE
PLETHYSMOGRAPHY embedded in a garment called
the LifeShirt was used for these validation studies.
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Accuracy

15. THANK YOU
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ATHEENA PANDIAN