Where is your hand weak? One grip tells all - Measure hand force with CMCU-05B

1. What is the CMCU-05B for?
The CMCU-05B is a multi-channel thin-film pressure sensor detector that can connect up to 9 thin-film pressure sensors. After attaching the sensors to the measurement points and connecting them to the display, pressure values can be directly shown (supports units: g/kg/N).

Its core function: simultaneously monitoring pressure distribution across 9 points. For example, when multiple sensors are attached to different positions on a grip ball (such as the thenar eminence, thumb, index finger, middle finger, ring finger, and little finger), gripping the ball will display the values of each channel on the screen in real time - the higher the value, the greater the force exerted at that position.

Practical applications: Rehabilitation therapists or family members can observe which parts of the hand exert more or less force when gripping the ball, and compare force changes across different grip postures or before/after rehabilitation training.

2. What do you need to prepare?

3. Where to attach the sensors?
Important note:
The sensor is a flexible film - it measures pressure wherever it's attached. Want to measure a specific spot? Just attach it there.

Application: Simultaneously measuring force at 6 key hand positions

If you want to check whether each finger's strength is normal or if the palm is compensating - for example, after stroke rehabilitation, to assess which fingers haven't fully recovered or if the palm is overcompensating - the CMCU-05B (with 9 channels, only 6 needed here) is very convenient.

Attach to 6 key positions (5 finger pads + the thenar eminence's corresponding ball position):


How to attach?
• Use double-sided tape to stick the sensors to the pads of the 5 fingers and the ball position corresponding to the thenar eminence.
• Secure the sensors with medical tape to prevent movement during gripping.

4. How to wire it?
Using the CMCU-05B (9-channel, with display)

1. Connect the two thin wires of each of the 6 sensors to the CH1 ~ CH6 terminals of the CMCU-05B (polarity doesn't matter; any 6 of the 9 channels can be used).
2. The CMCU-05B module has a built-in 450mAh battery and can be used directly (no computer needed), though it also supports computer connection.

5. How to view the data?
Method 1: Directly check the screen
The 2.0-inch color display shows values for all 9 channels. The connected sensors display real-time pressure values, while unused channels show 0. The higher the force at a hand position, the larger the corresponding channel number. Supports switching between g/kg/N units.

Method 2: Connect to a computer

1. Open the manufacturer's data acquisition software on the computer.
2. Select the corresponding COM port and click "Connect."
3. The software displays real-time pressure values and can also show a graph.
4. The software includes a "Save" function to store collected data as files for later analysis and processing.

6. What exactly is measured?
For the experiments below, you can choose one to try:

Experiment 1: Hand force distribution test (measure 6 positions simultaneously)

1. Attach 6 sensors to the grip ball and connect it to the 05B.
2. Hold the grip ball with your hand corresponding to the thin-film pressure sensor positions (simulating a grasping motion).
3. Observe the values of the 6 channels on the screen:
4. For a normal person, the index and middle fingers exert the most force, while the little finger exerts the least.
5. If the value for a certain finger is significantly low (e.g., close to 0), it indicates that this finger may not be able to exert force.
6. If the thenar eminence value is very high, but all finger values are very low, it suggests the palm is "compensating" - a common adverse pattern in stroke rehabilitation.
7. You can test the left and right hands separately and compare the differences between corresponding fingers. Experiment 2: Pre- and post-rehabilitation comparison
8. Pre-rehabilitation test: Use the 05B to measure the force output at 6 positions on the hand once and save the data.
9. Conduct a period of rehabilitation training (e.g., squeezing a stress ball, finger opening and closing exercises).
10. Post-rehabilitation test: Measure again under exactly the same conditions (same grip, same posture).
11. Compare the two sets of data:
12. Has the finger with the previously low value increased? → Indicates finger strength has recovered.
13. Has the previously high thenar eminence value decreased, while finger values increased? → Indicates the force pattern has shifted from "palm compensation" to "active finger force application," a sign of good rehabilitation progress.
14. No change or worsening → Indicates the rehabilitation plan needs adjustment.

7. Summary
If you want to know how much force each of the five fingers exerts simultaneously: use the CMCU-05B with 6 sensors, attach them to 6 positions (5 fingers + the thenar eminence corresponding position on the ball), and read the pressure changes directly. The finger whose corresponding channel value is small is the one lacking strength. If the thenar eminence value is very high but all five finger values are very low, it indicates the palm is compensating. It's that simple.

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