CN2055302U - Medical two-direction micro current excess-current protector - Google Patents
Medical two-direction micro current excess-current protector Download PDFInfo
- Publication number
- CN2055302U CN2055302U CN 89217414 CN89217414U CN2055302U CN 2055302 U CN2055302 U CN 2055302U CN 89217414 CN89217414 CN 89217414 CN 89217414 U CN89217414 U CN 89217414U CN 2055302 U CN2055302 U CN 2055302U
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- Prior art keywords
- medical
- current
- protector
- window comparator
- overcurrent protector
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a medical two-direction microcurrent overcurrent protector, which is an electronic reusage overcurrent protector serially connected to a patient and the indirect lead of a medical monitoring instrument. The medical two-direction microcurrent overcurrent protector comprises a microcurrent sampler (1) serially connected in the patient and the earthing lead of the medical monitoring instrument, a chopped-wave self-stabilizing zero 7650 operational amplifier (2), a window comparator (3), a latch (4), an actuator (5) alarming with sound and light and cutting the lead off and a delayed feed circuit (6) of the power supply of the window comparator. The action current is 50 microamperes (+/-) 20% (the AC line-frequency virtual value and the two-direction direct-current), the action time of the protector is smaller than or equal to 100 milliseconds, and the temperature of the operational environment is +5 centigrade degrees-+40 centigrade degrees.
Description
The utility model belongs to technical field of medical instruments, is a kind ofly to be serially connected with monitoring instrument ground connection and to lead in the line, and the electronics with sound and light alarm is reused the little overcurrent protector that declines.
At present, electric current action type overcurrent protector has serial connection fusible link formula.As: in some electrocardiographs; the right leg ground connection of the patient fusible link of one 5 milliamperes of normal serial connections in the line that leads; to ensure that electric current is no more than this safe current threshold values; but the blowout current of fusible link and fusing speed is generally far away from causing the patient to damage and dead electric current and more than the time, therefore to patient safety protection existing problems still.Known " protector for null line breaking ", Chinese patent publication number 87100154 and " adopting the overcurrent interrupter of RMS sampling " Chinese patent application numbers 86107915 is another kind of electric current action type overcurrent protector.Its principle is the electric current that adopts in current transformer measurement and comparison distribution transformer live wire and the center line.If its door equates that promptly difference is zero, the intact leakage current of instrument then, if the electric part of instrument and ground short circuit or defective insulation and produce electric leakage, then current in middle wire just is lower than the live wire electric current.Once surpassing safe limit value (as 6 milliamperes) overcurrent interrupter, this difference promptly cuts off the electricity supply rapidly; therefore difference promptly equals the size (no matter whether this electric current arrives the ground path by human body or other) of leakage current; so promptly leakage current is limited in below 6 milliamperes; people, machine safety have been guaranteed; but this kind overcurrent protector is sensitive inadequately for the leakage current (microampere order electric current) that cuts off under the microshock level, so it is used mainly as the macroshock overcurrent protector.It is cut off the electricity supply and carries out overcurrent protection in addition, and this is unallowed in the patient monitoring district.Because this will make the Other Instruments of keeping patient's life lose power supply, same entail dangers to patient's life security.
The purpose of this utility model is to make a kind of electronics and reuses the overcurrent protector that declines.The little electric current that flows to tissue and internal organs via the crosslinking electrode of medical monitor or probe, cardiac catheter is carried out overcurrent protection.
Describe below in conjunction with 1,2,3 pairs of concrete implementing measures of the present utility model of accompanying drawing and operation principle: solving measure of the present utility model is that it has used the resistance R of resistance smaller or equal to 10 ohm of scopes
0During the ground connection that is series at medical monitoring equipment is led as microampere order current sampler 1.Copped wave is from the amplifier 2 of steady 0 7650 type operational amplifiers as sampled signal.Signal after window comparator 3 will amplify and setting reference voltage V
R+, V
R-Compare.D type flip flop latchs comparative result as latch 4.The sound that light-emitting diode, loudspeaker, relay are formed, light are reported to the police and are cut off the actuator 5 that leads and reaches for fear of misoperation, and window comparator has used the combinational circuit of 555 time-delay power supply circuits 6.Operation principle is the leakage current that just leading from monitoring instrument or other electric current of receiving the patient all should flow through patient and medical monitoring equipment under normal operating position the ground connection ground of line to instrument that leads.Once this electric current during more than or equal to 50 microamperes, makes R
0Pressure drop increases on sampler 1 resistance.This pressure drop signal is sampled signal amplifier 2 and amplifies the back by window comparator 3 and setting reference voltage V
R+, V
R-Compare, comparative result is latched by the latch 4 that d type flip flop makes, and its Q is output as at 1 o'clock makes sound, light, circuit turn-on, carries out sound and light alarm.Q is output as zero and gets and non-ly make relay J work, thereby makes the normally-closed contact J on the line that respectively leads
1, J
2, J
3Disconnect, ensured patient safety.
Advantage of the present utility model is that it has used and cuts off the method for leading to jeopardizing protecting and the uninterrupted power supply power supply more than or equal to 50 microampere order electric currents of patient's life security from various aspects, and when protection, have sound, light is reported to the police.After fault is got rid of, the knob of resetting is arranged, medical two-way little overcurrent protector is resetted.
The utility model by detecting effect is: cut off the operating current that leads for greater than, equal 50 microamperes ± 20%(AC power frequency effective value and bidirectional, dc), operate time is smaller or equal to 100 milliseconds, environment for use temperature+5 ℃-+40 ℃.
Accompanying drawing behind the utility model specification, Fig. 1 represent that the function of medical two-way little overcurrent protector described in the utility model can block diagram.Fig. 2 represents the electrical schematic diagram of medical two-way little overcurrent protector described in the utility model.Fig. 3 represents the application drawing of medical two-way little overcurrent protector described in the utility model.I is represented patient's circuit among the figure, and II represents to be serially connected with lead medical two-way little overcurrent protector in the line of ground connection.III is represented medical monitoring equipment.
Claims (3)
1, a kind of medical two-way little overcurrent protector is characterized in that, includes to be series at lead resistance R in the line of patient and medical monitoring equipment ground connection
0Little current sampler 1, copped wave is from steady 0 7650 operational amplifiers 2, window comparator 3, the latch 4 that is made by d type flip flop, sound, the light of forming with light-emitting diode, loudspeaker and relay J are reported to the police and are cut off the actuator 5 that leads and time-delay power supply circuits 6 six parts of window comparator are formed.
2, it is characterized in that resistance R in its little current sampler 1 according to the described medical two-way little overcurrent protector of claim 1, span is smaller or equal to 10 ohm.
3, it is characterized in that according to claim 1,2 described medical two-way little overcurrent protectors that the power supply of used window comparator 3 is supplied with and adopted the 555 unlatchings time-delay power supply circuits of forming 6, to prevent misoperation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89217414 CN2055302U (en) | 1989-09-26 | 1989-09-26 | Medical two-direction micro current excess-current protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89217414 CN2055302U (en) | 1989-09-26 | 1989-09-26 | Medical two-direction micro current excess-current protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2055302U true CN2055302U (en) | 1990-03-28 |
Family
ID=4872672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89217414 Withdrawn CN2055302U (en) | 1989-09-26 | 1989-09-26 | Medical two-direction micro current excess-current protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2055302U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795027A (en) * | 2012-10-31 | 2014-05-14 | 上海儒竞电子科技有限公司 | Electric leakage detection protection circuit |
| CN105305368A (en) * | 2015-10-26 | 2016-02-03 | 南京航空航天大学 | Hot wire current limiting protection circuit for hot-wire anemometer |
| CN102130436B (en) * | 2010-01-18 | 2016-03-30 | 西门子瑞士有限公司 | Load current supervisory circuit, method and fire alarming and control device |
| CN105932636A (en) * | 2016-06-13 | 2016-09-07 | 国家电网公司 | Overcurrent protection circuit of power-frequency withstand voltage test |
| CN111044163A (en) * | 2019-12-31 | 2020-04-21 | 中国电子科技集团公司第四十七研究所 | Temperature sensor with alarm output function |
-
1989
- 1989-09-26 CN CN 89217414 patent/CN2055302U/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130436B (en) * | 2010-01-18 | 2016-03-30 | 西门子瑞士有限公司 | Load current supervisory circuit, method and fire alarming and control device |
| CN103795027A (en) * | 2012-10-31 | 2014-05-14 | 上海儒竞电子科技有限公司 | Electric leakage detection protection circuit |
| CN105305368A (en) * | 2015-10-26 | 2016-02-03 | 南京航空航天大学 | Hot wire current limiting protection circuit for hot-wire anemometer |
| CN105305368B (en) * | 2015-10-26 | 2017-12-08 | 南京航空航天大学 | The hot line current-limiting protection circuit of hot-wire anemometer |
| CN105932636A (en) * | 2016-06-13 | 2016-09-07 | 国家电网公司 | Overcurrent protection circuit of power-frequency withstand voltage test |
| CN111044163A (en) * | 2019-12-31 | 2020-04-21 | 中国电子科技集团公司第四十七研究所 | Temperature sensor with alarm output function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |