Table 2 A partial list of commercially available temperature, pressure and moisture sensors

Pressure

Honeywell^® 170PC

21.5 × 21.5 × 34.3*

Invasive to human body due to large size. Fluid flow is required to create pressure.

Pressure

Honeywell^® 19C015A7

19.0 × 35.6^#

Invasive to human body due to metallic port and large size.

Pressure

Measurement Specialities™ FC22

34.0 × 16.8^#

Invasive to human body due to large metallic structure.

Pressure

Measurement Specialities™ MS5540C

6.4 × 6.4 × 3.0*

Invasive to human body due to hard metallic structure.

Pressure

Interlink Electronics FSR406

38 × 38 × 0.5

Flexible, non-invasive, and bendable structure. Works on the principle of impedance change with applied pressure.

Moisture

Honeywell^® HIH403X/503X Series

8.65 × 4.20 × 3.0*

Less invasive to human body due to small size. Air samples are required for moisture measurement.

Moisture

Silicon Laboratories Inc. Si7005

4.0 × 4.0 × 1.5*

Less invasive to human body due to small size. Air samples are required for moisture measurement. Needs additional on-board circuits to operate.

Moisture

TDK Corporation CHS-SS Series

25 × 10 × 5.0*

Invasive to human body due to relatively large size. Air samples are required for moisture measurement.

Moisture

Multicomp HCZ-D5

10 × 5.0 × 0.5*

Miniature size, comparatively less invasive. Works on the principle of impedance change with the moisture level.

Temperature

Texas Instruments LM62

3.0 × 1.4 × 1.1*

Suitable for placement within the dressing. Accuracy ±3°C.

Temperature

Texas Instruments LM35DM

6.5 × 5.4 × 2.0*

Dimensions are not suitable for placement within the dressing. Accuracy ±0.5°C.

Temperature

Texas Instruments LM94021

2.15 × 2.4 × 1.1*

Dimensions suitable for placement within the wound dressing. Accuracy ±1.5°C. Gain can be controlled digitally.