GB1520671A - Heart pacemakers - Google Patents
Heart pacemakersInfo
- Publication number
- GB1520671A GB1520671A GB5026875A GB5026875A GB1520671A GB 1520671 A GB1520671 A GB 1520671A GB 5026875 A GB5026875 A GB 5026875A GB 5026875 A GB5026875 A GB 5026875A GB 1520671 A GB1520671 A GB 1520671A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wave
- oscillator
- rate
- capacitor
- detection
- 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
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
- A61N1/3621—Heart stimulators for treating or preventing abnormally high heart rate
- A61N1/3622—Heart stimulators for treating or preventing abnormally high heart rate comprising two or more electrodes co-operating with different heart regions
Landscapes
- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Electrotherapy Devices (AREA)
Abstract
1520671 Heart pacemakers MEDTRONIC INC 8 Dec 1975 [9 Dec 1974] 50268/75 Heading A5R [Also in Division H3] A synchronous heart pacemaker incorporates an upper limit for the rate of stimulation, applicable where the detected natural beat rate exceeds the limit. Pulse generator 10 (Fig. 2) includes an oscillator 12 and a rate limit circuit 50 which sets a minimum 500 ms pulse spacing (120 per minute). if the oscilllator is triggered too rapidly (as if a circuit element is defective). Normally-conductive transistor Q12 (Fig. 3b) is biased off after each output pulse by charge on capacitor C15 until the capacitor has discharged over 500 ms, preventing transistors Q9, Q11, Q13 and Q14 being turned on to discharge output capacitor C13. In the absence or detected natural beats the oscillator is free-running (asynchronous) with a period (1000 ms) determined by its RC-circuit C11 and R14, but output pulses are also triggered on demand (synchronously). A suitable interval (100 ms) after detection of a P- wave. Detection of a P-wave or an R-wave at 18, 14 Fig. 2 causes inhibit circuits 58, 34 to render the respective detectors 54, 25 refractory for a period (150 ms, 300 ms). Each detected P-wave sets a bistable memory 66 and if the setting is not cleared within the 100ms interval by detection of an R- wave, delay circuit 70 triggers the oscillator 12. Each oscillator output pulse resets the oscillator activates inhibiting circuits 50, 58, 34 and clears the memory 66. In the rate-limited mode of the invention, a natural P-wave will on occasion be received while the P-wave detector is refractory for 150 ms following an R-wave, and will not therefore give rise to an output pulse. The R-wave spacing will be about 650 ms, rather than 500 ms, at this point.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US53079974A | 1974-12-09 | 1974-12-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1520671A true GB1520671A (en) | 1978-08-09 |
Family
ID=24115026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5026875A Expired GB1520671A (en) | 1974-12-09 | 1975-12-08 | Heart pacemakers |
Country Status (10)
Country | Link |
---|---|
JP (1) | JPS5178595A (en) |
AU (1) | AU497527B2 (en) |
BR (1) | BR7507064A (en) |
CA (1) | CA1067960A (en) |
DE (1) | DE2554933C2 (en) |
FR (1) | FR2293915A1 (en) |
GB (1) | GB1520671A (en) |
IT (1) | IT1047835B (en) |
NL (1) | NL7512530A (en) |
SE (1) | SE412850B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4091817A (en) * | 1976-09-27 | 1978-05-30 | American Optical Corporation | P-Wave control, R-wave inhibited ventricular stimulation device |
DE2861213D1 (en) * | 1977-10-17 | 1981-12-24 | Medtronic Inc | Heart pacemaker and monitor |
AU533357B2 (en) * | 1978-11-06 | 1983-11-17 | Medtronic, Inc. | Digital cardiac pacemaker |
US4344437A (en) * | 1980-04-30 | 1982-08-17 | Medtronic, Inc. | Pacemaker triggering coupling circuit |
US4429697A (en) * | 1982-04-12 | 1984-02-07 | Telectronics Pty. Ltd. | Dual chamber heart pacer with improved ventricular rate control |
DE3535517A1 (en) * | 1985-10-04 | 1987-04-09 | Siemens Ag | Atrial controlled pacemaker |
DE3535568A1 (en) | 1985-10-04 | 1987-04-09 | Siemens Ag | Atrial controlled pacemaker |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3057356A (en) * | 1960-07-22 | 1962-10-09 | Wilson Greatbatch Inc | Medical cardiac pacemaker |
US3253596A (en) * | 1963-05-27 | 1966-05-31 | Cordis Corp | Cardiac pacer |
US3478746A (en) * | 1965-05-12 | 1969-11-18 | Medtronic Inc | Cardiac implantable demand pacemaker |
US3648707A (en) * | 1969-07-16 | 1972-03-14 | Medtronic Inc | Multimode cardiac paces with p-wave and r-wave sensing means |
-
1975
- 1975-10-16 IT IT5180975A patent/IT1047835B/en active
- 1975-10-27 NL NL7512530A patent/NL7512530A/en not_active Application Discontinuation
- 1975-10-29 BR BR7507064A patent/BR7507064A/en unknown
- 1975-12-02 FR FR7536805A patent/FR2293915A1/en active Granted
- 1975-12-04 AU AU87247/75A patent/AU497527B2/en not_active Expired
- 1975-12-06 DE DE19752554933 patent/DE2554933C2/en not_active Expired
- 1975-12-06 JP JP14587575A patent/JPS5178595A/en active Granted
- 1975-12-08 GB GB5026875A patent/GB1520671A/en not_active Expired
- 1975-12-08 SE SE7513783A patent/SE412850B/en not_active IP Right Cessation
- 1975-12-08 CA CA241,203A patent/CA1067960A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
AU8724775A (en) | 1977-06-09 |
DE2554933C2 (en) | 1982-06-09 |
SE7513783L (en) | 1976-06-10 |
FR2293915A1 (en) | 1976-07-09 |
BR7507064A (en) | 1976-08-17 |
FR2293915B1 (en) | 1981-03-27 |
JPS5178595A (en) | 1976-07-08 |
NL7512530A (en) | 1976-06-11 |
CA1067960A (en) | 1979-12-11 |
IT1047835B (en) | 1980-10-20 |
AU497527B2 (en) | 1978-12-14 |
JPS5533347B2 (en) | 1980-08-30 |
DE2554933A1 (en) | 1976-06-16 |
SE412850B (en) | 1980-03-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19951207 |