CN1951321A - Skin myoelectricity sensor - Google Patents
Skin myoelectricity sensor Download PDFInfo
- Publication number
- CN1951321A CN1951321A CN 200510100453 CN200510100453A CN1951321A CN 1951321 A CN1951321 A CN 1951321A CN 200510100453 CN200510100453 CN 200510100453 CN 200510100453 A CN200510100453 A CN 200510100453A CN 1951321 A CN1951321 A CN 1951321A
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- China
- Prior art keywords
- skin
- prestage
- trap level
- stage
- trap circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention relates to a skin electromyography sensor. Wherein, it comprises forward stage, amplifier, trap circuit, and output stage; two amplifiers made from one silicon plate form the forward stage with same-phase parallel input; the trap circuit uses double-T active network. The invention via J ultra-fine device is welded in an insulated plastic box at 29mm diameter and 15mm thickness, while the total weight with it and metal electrode on the skin is 15g; the surfaces of two metal electrodes are plated with gold, while their diameters are 6-8mm, and central distance is 20-25mm.
Description
Technical field
The present invention relates to the pick off that rehabilitation engineering and bio electricity control technology field are used.
Background technology
The epidermic muscle-electricity transducer circuit of existing West Germany Otto Bo Ke company (otto Bock Ltd) is made up of prestage, amplifier stage, trap level and four parts of output stage, prestage adopts an operational amplifier to form differential input form, the trap level adopts passive twin-T network, exist input impedance low, information loss is big and to the shortcoming a little less than the power frequency interference rejection capability.
Summary of the invention
The present invention proposes a kind of new circuit structure, and its feature is to adopt two operational amplifiers of same silicon chip manufacturing to form the prestage of importing with being in parallel; The trap level adopts the double T active electric network.
The circuit structure that adopts the present invention to propose, the input impedance height of pick off (greater than 10M Ω), common mode rejection ratio height (greater than 90dB), and the power frequency that has suppressed 50HZ effectively disturbs, and obtained good effect in the clinical practice of myoelectric limb.
Accompanying drawing is a schematic circuit of the present invention, and four operational amplifiers (A1-4) among the figure are integrated on the same silicon chip, and w is the gain-adjusted potentiometer, and resistance is 3.3K Ω～5.4K Ω; C1 is the capacitance of operational amplifier A 1 and A2, and capacitance is 3.3f μ～4.7f μ; Resistance R13 and R14 are the Proportional Feedback resistance of the active wave invigorating network of double T, and resistance is respectively 3.3K Ω and 330 Ω, regulate the Q-value that their ratio can the appropriate change network.
In1 in the accompanying drawing and in2 are two metal electrodes that directly attach skin surface, and ou is the output of circuit.The A point connects the metal isolated electrode among the figure.
It is 29 millimeters of Φ that this epidermic muscle-electricity transducer adopts the welding of microminiature discrete device to be encapsulated in an external diameter, thickness is in 15 millimeters the ambroin box, is 15 grams together with the metal electrode that attaches skin in interior weight, surface of metal electrode is gold-plated, diameter is 6～8 millimeters, and centre distance can be 25 millimeters of Φ 20～Φ.
Claims (3)
1, a kind of epidermic muscle-electricity transducer is made up of prestage, amplifier stage, trap level and four parts of output stage, it is characterized in that adopting two operational amplifiers of same silicon chip manufacturing to form the prestage of importing with being in parallel, and the trap level adopts the double T active electric network.
2, by claim 1 described epidermic muscle-electricity transducer, it is characterized in that between two operational amplifier A 1 of prestage and the A2 capacitance being arranged, capacitance is 3.3p μ～4.7f μ.
3, by claim 1 described epidermic muscle-electricity transducer, it is characterized in that the trap level adopts the double T active electric network of resistance feedback-type, feedback resistance is respectively 3.3k Ω and 330 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510100453 CN1951321A (en) | 2005-10-20 | 2005-10-20 | Skin myoelectricity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510100453 CN1951321A (en) | 2005-10-20 | 2005-10-20 | Skin myoelectricity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1951321A true CN1951321A (en) | 2007-04-25 |
Family
ID=38058022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510100453 Pending CN1951321A (en) | 2005-10-20 | 2005-10-20 | Skin myoelectricity sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1951321A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103040459A (en) * | 2013-01-05 | 2013-04-17 | 西安交通大学 | Method of high-fidelity filtering for power frequency interferences in multichannel feeble physiological information recording system |
-
2005
- 2005-10-20 CN CN 200510100453 patent/CN1951321A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103040459A (en) * | 2013-01-05 | 2013-04-17 | 西安交通大学 | Method of high-fidelity filtering for power frequency interferences in multichannel feeble physiological information recording system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |