GB634575A - Improvements in electrocardiograms - Google Patents
Improvements in electrocardiogramsInfo
- Publication number
- GB634575A GB634575A GB35480/46A GB3548046A GB634575A GB 634575 A GB634575 A GB 634575A GB 35480/46 A GB35480/46 A GB 35480/46A GB 3548046 A GB3548046 A GB 3548046A GB 634575 A GB634575 A GB 634575A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- paper
- moving coil
- potentials
- over
- Prior art date
- 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.)
- Expired
Links
- 241001422033 Thestylus Species 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
- A61B5/333—Recording apparatus specially adapted therefor
- A61B5/338—Recording by printing on paper
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
- A61B5/333—Recording apparatus specially adapted therefor
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Handling Of Cut Paper (AREA)
Abstract
634,575. Electrocardiographs. HUGHES, C. L. (Electro-Physical Laboratories, Inc.). Nov. 29, 1946, No. 35480. [Class 81(ii)] [Also in Groups XIX, XXXVI, XXXVIII and XL(c)] In an electrocardiograph the body potentials are recorded by apparatus employing a known system of negative feedback. The potentials are fed from electrodes W, X, Y. Z, Fig. 1, over switches N, N' to an amplifier V1 feeding amplifiers V2, V3 supplying a push-pull pair V4, V5 whose output is fed to the moving coil Cg nf a recorder: an auxiliary coil Ca carried by the coil Cg generates an emf. which is applied degeneratively to the input of V1 and may be applied regeneratively to the moving coil Cg over a filter circuit Q. A gas discharge tube G between valves V3, V4 provides a voltage drop to equalize the potentials applied to V4 and V5. Moving coil recorder. The moving coil Cg, Fig. 12, carries the auxiliary coil Ca and oscillates rod 23 to cause the stylus S, Fig. 4, to oscillate about pivot 25. The stylus has a heating coil (not shown) to record on waxed paper. It is maintained in contact with the paper by roller 29 pressed down by spring arm 28, Fig. 3, and can be lifted off the paper by movement of lever 31, Fig. 7. The paper is stored on roller O and is drawn over the platen 59b by feed rollers (not shown) driven by a motor. The feed rollers may actuate a cam to close contacts to provide a calibrating voltage applied to the input of the amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB35480/46A GB634575A (en) | 1946-11-29 | 1946-11-29 | Improvements in electrocardiograms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB35480/46A GB634575A (en) | 1946-11-29 | 1946-11-29 | Improvements in electrocardiograms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB634575A true GB634575A (en) | 1950-03-22 |
Family
ID=10378199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35480/46A Expired GB634575A (en) | 1946-11-29 | 1946-11-29 | Improvements in electrocardiograms |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB634575A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0002255A1 (en) * | 1977-12-05 | 1979-06-13 | Siemens Aktiengesellschaft | Recording apparatus |
-
1946
- 1946-11-29 GB GB35480/46A patent/GB634575A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0002255A1 (en) * | 1977-12-05 | 1979-06-13 | Siemens Aktiengesellschaft | Recording apparatus |
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