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| 2. |
- Ask, Per, et al.
(författare)
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Pressure integrating transducer for oesophageal manometry.
- 1979
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Ingår i: Medical and Biological Engineering and Computing. - 0140-0118 .- 1741-0444. ; 17:3, s. 360-364
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Tidskriftsartikel (refereegranskat)abstract
- A transducer has been designed that gives an integrated measure of the radial pressure profile at a specific level in the oesophagus. The oesophageal pressure is picked up by a semicylinder elastically connected to a transducer housing by means of a slotted semicylinder. The displacement of the semicylinder is sensed by a semiconductor transducer element. The transducer has a linear relation between static pressure and output voltage, flat frequency characteristic and low temperature drift.
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| 3. |
- Eriksson, Nils-Einar, et al.
(författare)
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A voltage clamp circuit for measuring rapid current transients in membranes
- 1976
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Ingår i: Medical and biological engineering. - 0025-696X .- 1741-0444. ; 14:3, s. 334-338
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Tidskriftsartikel (refereegranskat)abstract
- A voltage clamp circuit is described which permits the measurements of current transients in membranes with time constants of the order of microseconds. The resistance Rs in series with the membrane is compensated for by a current feedback circuit which produces a rapid charging of the membrane capacitance C. It is possible by this arrangement to reduce the charging period to a value considerably shorter than the time constant RsC.
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| 4. |
- Karlsson, H.G., et al.
(författare)
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An electronic delay circuit for biomedical simulations.
- 1971
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Ingår i: Medical & Biological Engineering & Computing. - 0140-0118. ; 9:6, s. 721-724
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Tidskriftsartikel (refereegranskat)abstract
- In many control problems, e.g. in biology, time delays of the order of seconds or more play an important role. The present device is intended for simulations of such problems. Its accuracy (0·1 per cent) is of the same magnitude as that for most analogue computer components. It has been used in preliminary experiments (Fig. 5) to study biological rhythms. However, many differential equations with time delay, including those with more complicated weighting functions than that in Fig. 5, can be successfully studied using this method.
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