Goniometer and Torsiometer
The comprehensive range of Biometrics' goniometers and torsiometers are ideal for quick, simple, and accurate measurement of joint movement in multiple planes. Extremely robust, lightweight and flexible, the sensors can be comfortably worn undetected under clothing, without hindering the actual movement of the joint.
The 'SG' series twin axis goniometers and 'Q' series single axis torsiometers provide improved mechanical integrity and electrical performance.
Goniometer and Torsiometer Specifications
In general, there are no fixed rules governing which size of sensor is most suitable for a particular joint; this depends on the size of the subject. The sensor must be capable of reaching across the joint so that the two end blocks can be mounted where least movement occurs between the skin and underlying skeletal structure. In certain circumstances more than one size of sensor will be appropriate. The following table is given for guidance only and refers to an adult population. Size used will vary within paediatrics.
|Joint||Output||No. of Channels||A Max||A Min||B||C||D||E||Weight (g)|
|SG65||Wrist||Flexion/extension, radial/ulnar deviation||2||65||30||55||18||54||20||22|
|SG75||Wrist (large)||Flexion/extension, radial/ulnar deviation||2||75||35||60||18||54||20||23|
|SG110||Elbow or ankle||Flexion/extension, or dorsiflexion/plantarflexion
|SG150||Knee or hip||Flexion/extension and valgus/varus, or flexion/extension and abudction/adduction||2||150||100||70||18||54||20||25|
|SG150/B||Back||Flexion/extension, lateral flexion||2||150||50||120||18||54||20||27|
|F35||Finger (DIP, PIP, MCP) or toe||Flexion/extension||1||35||30||18||8||15||8||8|
(measurements in mm)
|Transducer type||strain gauge|
|Accuracyº||± 2º measured over a range of ± 90º|
|Repeatability||1º measured over a range of 90º|
|Operating temperature range||+10ºC to +40ºC|
|Temperature zero drift||0.15 degrees angle / ºC|
1Life test results have been collected by cycling the sensors through movements that would happen during everyday use. For example, placing a sensor on an adult elbow and moving from the neutral position to maximum flexion and back to the neutral position, the unit will function for typically 600,000 cycles.
'J' series cables, with locking connectors, are available in various lengths - J500 (500mm), J1000 (1000mm), J1500 (1500mm) - and connect the 'SG' and 'F' series goniometers and 'Q' series torsiometers to any of the Biometrics' instrumentation. One cable per channel is required.
Attachment Tape T10
A pack of 10 rolls of medical grade double sided adhesive tape for attachment of all goniometers and torsiometers to the subject.
Biometrics' sensors are sold separately or as part of complete measurement systems. Available systems include instrumentation for static angle readout, dynamic on line data acquisition in 8, 16, or 24 channel configurations, or fully portable wireless data collection.
Twin Axis Goniometers SG65, SG75, SG110, SG110/A, SG150, SG150/B
The 'SG' series twin axis goniometers simultaneously measure angles in up to two planes of movement. For example, to measure wrist movements, the endblocks of the SG65 goniometer are attached on the dorsal surface using double sided tape (type. No. T10), one end over the third metacarpal, the other over the midline of the forearm, with the wrist in the neutral position.
The goniometer has two separate output connectors, one measures flexion/extension, the other radial/ulnar deviation. When used to measure a single axis joint such as the knee or elbow, or when measuring a single plane of a twin axis joint, simply connect one channel, the other remains redundant. All twin axis SG series goniometers function the same way, the difference being physical size.
Single Axis Torsiometers Q110 and Q150
Biometrics Ltd 'Q' series single axis torsiometers are designed for measurement of rotations in one plane e.g. forearm pronation/supination or neck axial rotation. If the torsiometer is bent in planes X-X or Y-Y the output remains constant. All torsiometers function in the same way, the difference being physical size.