CN104792429A - Device for measuring temperature of exhaled gas of mechanical ventilation patient - Google Patents
Device for measuring temperature of exhaled gas of mechanical ventilation patient Download PDFInfo
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- CN104792429A CN104792429A CN201510144201.3A CN201510144201A CN104792429A CN 104792429 A CN104792429 A CN 104792429A CN 201510144201 A CN201510144201 A CN 201510144201A CN 104792429 A CN104792429 A CN 104792429A
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Abstract
The invention discloses a device for measuring the temperature of exhaled gas of a mechanical ventilation patient. The device comprises a fast-response temperature sensor and a multi-channel high-speed temperature acquisition device. The fast-response temperature sensor is connected with the multi-channel high-speed temperature acquisition device by a temperature compensation wire and comprises a plurality of temperature probes, each temperature probe is used for measuring a channel of temperature signals, the measured multiple channels of temperature signals further can be converted into a plurality of channels of thermoelectromotive force signals by the fast-response temperature sensor, and the multiple channels of thermoelectromotive force signals can be coupled to the multi-channel high-speed temperature acquisition device by the fast-response temperature sensor via the temperature compensation wire; the multi-channel high-speed temperature acquisition device comprises a sensor signal conditioning circuit, a high-speed multi-channel signal switching circuit, a high-speed AD (analog and digital) conversion circuit, a digital temperature acquisition circuit, a master control circuit, a communication circuit and an isolation power circuit, and the high-speed multi-channel signal switching circuit is arranged between the sensor signal conditioning circuit and the high-speed AD conversion circuit in a connected manner.
Description
Technical field
The present invention relates to a kind of medical determinator for biomedical engineering technology field, in particular to a kind of device for measurement mechanical ventilated patient expiratory air temperature.
Background technology
Certain body temperature is the necessary condition that body carries out metabolism and normal activities.The core temperature of human body generally maintains in an extremely narrow scope (being less than 0.4 DEG C), in the process of surgery anesthesia, operating room air convection current, patient body-surface exposed area is large, operative incision is large, the factors such as intestinal tube, peritonaeum and thoracic cavity open-assembly time are long can cause body to dispel the heat in a large number, and in art, rinse a large amount of physiological saline, the reasons such as a large amount of cold liquid of infusion and banked blood all can cause hypothermia in art.And operating room environment temperature is too high, severe infections, transfusion reaction etc. can cause patient to occur high heat in art, some anaesthetics may cause malignant fever, cause the unmanageable hyperpyrexia of general clinical measure, finally can cause death.Some anaesthetics can change patient's cold and the threshold value by thermal response, and the scope of threshold value is broadened, and body temperature is wayward.
In art, whether the management of body temperature appropriately directly can affect the prognosis of patient, is ensure anesthesia surgery success, reduces in art and the important measures of postoperative complications, be significant effective monitoring of body temperature in art.Perioperative body temperature monitoring has following several method: be DIE Temperature measuring method the most accurately by PAC measuring tempeature, but, floating catheter need be placed at pulmonary artery place, for there being wound monitoring, complication is more, simultaneously by the restriction of tube indwelling technology, consumptive material price and instrument and equipment, not easily implement the method; Tympanic temperature can react brain temperature preferably, but probe placement malposition will affect measurement result, and have the danger causing the hemorrhage and tympanic membrane perforation of external auditory meatus, infrared technology makes eardrum thermometric not need to contact eardrum, but can not monitor continuously, earwax can make thermometric be forbidden with earwaxing; Measuring nasopharyngeal temperature is that temp probe is delivered to pharynx nasalis by nostril, if probe can not be put into tram in practical operation, its temperature variation is slower than actual temperature change; Measuring esophageal temperature is that temp probe is placed on distal esophagus, but esophageal temperature reading is at open chest surgery, and special needs can reduce to during the operations such as the cold liquid of thoracic cavity quick filling, patient's forbidding of varices of esophagus simultaneously, esophageal ulcer, esophageal injury; Rectal temperature close proximity to body nuclear temperature, but measure position requirement comparatively large, not easily apply in art; Bladder temperature can react temperature in peritoneal cavity preferably, but thermometric is by the impact of urine volume, and when pelvic cavity or abdominal operation expose bladder, accuracy can decline; Though oral cavity, axillary temperature not manageability close to central temperature but in anesthesia.
In sum, although temperature monitoring is significant, at present still the reliable device for detecting temperature of neither one and method can in art completely accurately, safety is without wound, the body temperature of monitoring patient continuously.
Summary of the invention
The invention provides a kind of device for measurement mechanical ventilated patient expiratory air temperature, in order to the temperature of measurement mechanical ventilated patient expiratory air.
For achieving the above object, device for measurement mechanical ventilated patient expiratory air temperature provided by the invention, comprise quick response temperature sensor and multi-channel high-speed temperature collecting device, quick response temperature sensor is connected by temperature compensation line with between multi-channel high-speed temperature collecting device, wherein
Quick response temperature sensor comprises multiple temp probe, each temp probe is for measuring a road temperature signal, and measured multi way temperature signal is converted into multichannel thermopower signal and multichannel thermopower signal is coupled to multi-channel high-speed temperature collecting device by temperature compensation line by quick response temperature sensor further;
Multi-channel high-speed temperature collecting device comprises sensor signal conditioning circuit, high speed multichannel signal commutation circuit, ultra high speed A/D conversion circuit, digital temperature acquisition circuit, main control circuit, communicating circuit and insulating power supply circuit, high speed multichannel signal commutation circuit is connected between sensor signal conditioning circuit and ultra high speed A/D conversion circuit, wherein
Sensor signal conditioning circuit comprises an interconnective high magnification differential amplifier circuit and a filtering circuit, high magnification differential amplifier circuit is connected with quick response temperature sensor, the multichannel thermopower signal that high magnification differential amplifier circuit is used for quick response temperature sensor to export is amplified to the volt level of suitable acquisition process by microvolt level, filtering circuit is used for the signal after to amplification and carries out filtering;
High speed multichannel signal commutation circuit comprises one 8 passage high speed switching chip, and the multichannel thermopower signal that 8 passage high speed switching chip are used for sensor signal conditioning circuit exports exports ultra high speed A/D conversion circuit to;
Ultra high speed A/D conversion circuit comprises a high speed 16 AD conversion chip, and 16 AD conversion chip are used for the multi-path digital temperature signal multichannel thermopower signal that high speed multichannel signal commutation circuit exports being converted to 16 at a high speed;
Digital temperature acquisition circuit comprises a digital temperature sensor, and digital temperature sensor is for gathering the temperature of multiple temp probe and multi-channel high-speed temperature collecting device tie point position and exporting main control circuit to after being converted to digital signal;
Main control circuit is connected with high speed multichannel signal commutation circuit and ultra high speed A/D conversion circuit, for carrying out sequential control and temperature channel switching to 8 passage high speed switching chip and carrying out sequential control to high speed 16 AD conversion chip, to gather the multi-path digital temperature signal of a time period of 16 AD conversion chip outputs at a high speed and to obtain multichannel average number temperature signal after being averaged to each road of the multi-path digital temperature signal of this time period, and according to the temperature of quick response temperature sensor and multi-channel high-speed temperature collecting device tie point position, rear output Transistor-Transistor Logic level signal is corrected to multichannel average number temperature signal,
Communicating circuit comprises a TTL RS 232 level transferring chip, communicating circuit is connected with main control circuit and computing machine, the Transistor-Transistor Logic level signal that TTL RS 232 level transferring chip is used for main control circuit exports is converted to RS232 level signal, and communicating circuit exports the RS232 level signal after conversion to computing machine further;
Insulating power supply circuit comprises an interconnective insulating power supply module and a filter capacitor, and wherein, insulating power supply module is connected with high magnification differential amplifier circuit, for providing positive-negative power for high magnification differential amplifier circuit.
In one embodiment of this invention, high magnification differential amplifier circuit comprises an operational amplifier chip AD8066.
In one embodiment of this invention, the multichannel thermopower signal that sensor signal conditioning circuit exports with the frequency of the highest 1MHz by high speed multichannel signal commutation circuit exports ultra high speed A/D conversion circuit to.
In one embodiment of this invention, 8 passage high speed switching chip in high speed multichannel signal commutation circuit are ADG508F.
In one embodiment of this invention, 16 AD conversion chip of the high speed in ultra high speed A/D conversion circuit are ADS7805U.
In one embodiment of this invention, the digital temperature sensor in digital temperature acquisition circuit is DS18B20.
In one embodiment of this invention, main control circuit comprises one 8 high-speed microprocessor STC12C5A60S2.
In one embodiment of this invention, the insulating power supply module in insulating power supply circuit is SR12D12.
In one embodiment of this invention, the TTL RS 232 level transferring chip in communicating circuit is MAX232.
In one embodiment of this invention, the number of temp probe is two, and one of them temp probe is arranged on respiratory cycle inhaling air end on the pipeline of patient side, for measuring suction gas temperature; Another temp probe is arranged between tracheal catheter angle coupling and hot and humid area device, for measuring expiratory air temperature.
The temperature resolution of the device for measurement mechanical ventilated patient expiratory air temperature provided by the invention is 0.01 DEG C, precision is 0.05 DEG C, this apparatus structure is simple, selection is common, safe and reliable, easy to use, easy enforcement, easy to operate, involved components and parts are cheap, function admirable, clinical practice requirement can be met preferably, have wide market outlook and application potential.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the electrical block diagram of the device of the measurement mechanical ventilated patient expiratory air temperature of one embodiment of the invention;
Fig. 2 is the circuit diagram of the high magnification differential amplifier circuit in sensor signal conditioning circuit of the present invention;
Fig. 3 is high speed multichannel signal commutation circuit of the present invention;
Fig. 4 is the circuit diagram of ultra high speed A/D conversion circuit of the present invention;
Fig. 5 is the circuit diagram of communicating circuit of the present invention;
Fig. 6 is the temp probe position view of one embodiment of the invention.
The quick response temperature sensor of description of reference numerals: 1-; 11-temp probe; 2-multi-channel high-speed temperature collecting device; 21-sensor signal conditioning circuit; 22-high speed multichannel signal commutation circuit; 23-ultra high speed A/D conversion circuit; 24-digital temperature acquisition circuit; 25-main control circuit; 26-communicating circuit; 27-insulating power supply circuit; 271-insulating power supply module; 272-filter capacitor; 3-temperature compensation line; 4-computing machine.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the electrical block diagram of the device of the measurement mechanical ventilated patient expiratory air temperature of one embodiment of the invention, as shown in the figure, device for measurement mechanical ventilated patient expiratory air temperature provided by the invention comprises quick response temperature sensor 1 and multi-channel high-speed temperature collecting device 2, quick response temperature sensor 1 is connected by temperature compensation line 3 with between multi-channel high-speed temperature collecting device 2, wherein
Quick response temperature sensor 1 comprises multiple temp probe 11, each temp probe 11 is for measuring a road temperature signal, one embodiment of the invention comprise two temp probes 11, be illustrated in figure 6 the temp probe position view of one embodiment of the invention, one of them temp probe 11 is arranged on respiratory cycle inhaling air end on the pipeline of patient side, for measuring suction gas temperature; Another temp probe 11 is arranged between tracheal catheter angle coupling and hot and humid area device, for measuring expiratory air temperature.Measured multi way temperature signal is converted into multichannel thermopower signal and multichannel thermopower signal is coupled to multi-channel high-speed temperature collecting device 2 by temperature compensation line 3 by quick response temperature sensor 1 further;
The present invention is when applying, quick response temperature sensor 1 is connected with computing machine 4, to export multichannel thermopower signal to computing machine 4, temperature signal switching software is installed in computing machine 4, temperature signal switching software shows the temperature value of each temp probe with interface form, and draw real time temperature curve simultaneously, meanwhile, the temperature value data that each temp probe can record by temperature signal switching software are saved to the assigned address of computing machine.
Multi-channel high-speed temperature collecting device 2 comprises sensor signal conditioning circuit 21, high speed multichannel signal commutation circuit 22, ultra high speed A/D conversion circuit 23, digital temperature acquisition circuit 24, main control circuit 25, communicating circuit 26 and insulating power supply circuit 27, high speed multichannel signal commutation circuit 22 is connected between sensor signal conditioning circuit 21 and ultra high speed A/D conversion circuit 23, wherein
Sensor signal conditioning circuit 21 comprises an interconnective high magnification differential amplifier circuit and a filtering circuit (not shown), high magnification differential amplifier circuit is connected 1 with quick response temperature sensor, the multichannel thermopower signal that high magnification differential amplifier circuit is used for being exported by quick response temperature sensor 21 is amplified to the volt level of suitable acquisition process by microvolt level, be illustrated in figure 2 the circuit diagram of the high magnification differential amplifier circuit in sensor signal conditioning circuit of the present invention; Filtering circuit is used for the signal after to amplification and carries out filtering;
High speed multichannel signal commutation circuit 22 comprises one 8 passage high speed switching chip, and the multichannel thermopower signal that 8 passage high speed switching chip are used for sensor signal conditioning circuit 21 to export exports ultra high speed A/D conversion circuit 23 to;
Ultra high speed A/D conversion circuit 23 comprises a high speed 16 AD conversion chip, and the multichannel thermopower signal that high speed 16 AD conversion chip are used for high speed multichannel signal commutation circuit 22 being exported is converted to the multi-path digital temperature signal of 16;
Be illustrated in figure 3 the circuit diagram of high speed multichannel signal commutation circuit of the present invention and ultra high speed A/D conversion circuit, be illustrated in figure 4 the circuit diagram of ultra high speed A/D conversion circuit of the present invention, wherein, 8 passage high speed switching chip in high speed multichannel signal commutation circuit 22 are ADG508F, and 16 AD conversion chip of the high speed in ultra high speed A/D conversion circuit 23 are ADS7805U.
Digital temperature acquisition circuit 24 comprises a digital temperature sensor, and digital temperature sensor is for gathering the temperature of multiple temp probe 11 and multi-channel high-speed temperature collecting device 2 tie point position and exporting main control circuit 25 to after being converted to digital signal;
Main control circuit 25 is connected with high speed multichannel signal commutation circuit 22 and ultra high speed A/D conversion circuit 23, for carrying out sequential control and temperature channel switching to 8 passage high speed switching chip and carrying out sequential control to high speed 16 AD conversion chip, to gather the multi-path digital temperature signal of a time period of 16 AD conversion chip outputs at a high speed and to obtain multichannel average number temperature signal after being averaged to each road of the multi-path digital temperature signal of this time period, and with the temperature of multi-channel high-speed temperature collecting device 2 tie point position, rear output Transistor-Transistor Logic level signal is corrected to multichannel average number temperature signal according to quick response temperature sensor 1.
The temperature-measurement principle of temp probe 11 is make use of when multichannel average number temperature signal is corrected, the point for measuring temperature of temp probe 11 is called hot junction, temp probe 11 and multi-channel high-speed temperature collecting device 2 junction are called cold junction, the actual temperature of point for measuring temperature is the difference of hot-side temperature and cold junction temperature, according to looking into thermocouple indexing table or being calculated the actual temperature of point for measuring temperature by linear calibration equation.
Communicating circuit 26 comprises a TTL RS 232 level transferring chip, communicating circuit 26 is connected with main control circuit 25 and computing machine 4, be illustrated in figure 4 the circuit diagram of communicating circuit 26 of the present invention, the Transistor-Transistor Logic level signal that TTL RS 232 level transferring chip is used for main control circuit 25 to export is converted to RS232 level signal, and communication electricity 26 tunnels export the RS232 level signal after conversion to computing machine 4 further;
Insulating power supply circuit 27 comprises interconnective insulating power supply module 271 and a filter capacitor 272, wherein, insulating power supply module 271 is connected with high magnification differential amplifier circuit, + the 12V of system direct current supply voltage transitions is+12V and-12V DC voltage by insulating power supply module 271, + 12V and-12V DC voltage are connected to the feeder ear of the high magnification differential amplifier circuit in sensor signal conditioning circuit 21, for the high magnification differential amplifier circuit in sensor signal conditioning circuit 21 is given security voltage of its normal work, filter capacitor 272 is in parallel with+12V and-12V direct current pressure side, its effect is filtering surge voltage, ensure that the voltage stabilization of insulating power supply module 271 output is at+12V and-12V.。
Wherein, high magnification differential amplifier circuit comprises an operational amplifier chip AD8066.
Wherein, the multichannel thermopower signal that sensor signal conditioning circuit 21 exports with the frequency of the highest 1MHz by high speed multichannel signal commutation circuit 22 exports ultra high speed A/D conversion circuit to.
Wherein, the digital temperature sensor in digital temperature acquisition circuit 24 is DS18B20.
Wherein, main control circuit 25 comprises one 8 high-speed microprocessor STC12C5A60S2.
Wherein, the insulating power supply module in insulating power supply circuit 27 is SR12D12.
Wherein, the TTL RS 232 level transferring chip in communicating circuit 26 is MAX232.
The course of work of the present invention is: temperature signal is converted to thermopower signal by response temperature sensor 1 fast, high magnification differential amplifier circuit is connected to carry out signal amplification by temperature compensation line 3, and circuit carries out filtering process after filtering, after process, signal enters 16 AD conversion chip ADS7805U at a high speed via 8 passage high speed switching chip ADG508F, 16 AD conversion chip ADS7805U carry out analog to digital conversion under the control of 8 high-speed microprocessor STC12C5A60S2 at a high speed, convert FPDP ADD0 to ADD15 parallel output to 8 the high-speed microprocessor STC12C5A60S2 of rear data by ADS7805U, complete a single channel temperature acquisition, 8 high-speed microprocessor STC12C5A60S2 control 8 passage high speed switching chip ADG508F and switch to next passage, carry out same temperature acquisition process, the temperature acquisition of whole passages (the corresponding temp probe of each passage) of a time point is completed after switching whole passage, after this process circulation designated cycle number of times (cycle index is by computer terminal software design patterns), complete the temperature acquisition of a fixed time section, the temperature data collected in circle collection process is averaging processing by 8 high-speed microprocessor STC12C5A60S2, and after multichannel medial temperature signal being corrected according to the temperature of quick response temperature sensor 1 and multi-channel high-speed temperature collecting device 2 tie point position and environment temperature, data after correcting are sent to computing machine 4 by communicating circuit 26, by the corresponding software in computing machine 4, multichannel medial temperature signal is shown, draw and preserve, thus, doctor clearly can learn the Temperature changing situation of carrying out the patient performed the operation in surgical procedure, to ensure that operation safety carries out.
Further illustrate as follows to single-point thermometric: 8 passage high speed switching chip ADG508F have 8 passages, single-point thermometric average time 50 times is to improve interference free performance, the highest slewing rate of 16 AD conversion chip ADS7805U is 250KHz at a high speed, be single channel and change minimum time into 4us, signal stabilization time after 8 passage high speed switching chip ADG508F select respective channel is not more than 1us, calculate according to 1us, single channel required time is 5us, it is 40us that whole 8 Channel-shifteds complete a required time, then single-point thermometric time=40us × average time=2ms, all channel temperatures are measured once according to the every 100ms of program design, the then maximum average time of single-point=100ms/40us=2500 time, as long as namely single-point whole passage thermometric average time theoretical value is no more than 2500 times, consider system clock deviation and the reserved part time, single-point thermometric average time maximum permissible value should be not more than 2000 times.
Multi-channel high-speed temperature collecting device 2 in the present invention can use multiple thermocouple sensor, and correlation parameter is arranged by computer terminal software, is stored in the EEPROM of control chip in multi-channel high-speed temperature collecting device after arranging, and is convenient to use next time.
The temperature resolution of the device for measurement mechanical ventilated patient expiratory air temperature provided by the invention is 0.01 DEG C, precision is 0.05 DEG C, this apparatus structure is simple, selection is common, safe and reliable, easy to use, easy enforcement, easy to operate, involved components and parts are cheap, function admirable, clinical practice requirement can be met preferably, have wide market outlook and application potential.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device in embodiment can describe according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (10)
1. the device for measurement mechanical ventilated patient expiratory air temperature, it is characterized in that, comprise quick response temperature sensor and multi-channel high-speed temperature collecting device, described quick response temperature sensor is connected by temperature compensation line with between described multi-channel high-speed temperature collecting device, wherein
Described quick response temperature sensor comprises multiple temp probe, each temp probe is for measuring a road temperature signal, and measured multi way temperature signal is converted into multichannel thermopower signal and multichannel thermopower signal is coupled to described multi-channel high-speed temperature collecting device by described temperature compensation line by described quick response temperature sensor further;
Described multi-channel high-speed temperature collecting device comprises sensor signal conditioning circuit, high speed multichannel signal commutation circuit, ultra high speed A/D conversion circuit, digital temperature acquisition circuit, main control circuit, communicating circuit and insulating power supply circuit, described high speed multichannel signal commutation circuit is connected between described sensor signal conditioning circuit and described ultra high speed A/D conversion circuit, wherein
Described sensor signal conditioning circuit comprises an interconnective high magnification differential amplifier circuit and a filtering circuit, described high magnification differential amplifier circuit is connected with described quick response temperature sensor, the multichannel thermopower signal that institute's high magnification differential amplifier circuit is used for described quick response temperature sensor to export is amplified to the volt level of suitable acquisition process by microvolt level, described filtering circuit is used for the signal after to amplification and carries out filtering;
Described high speed multichannel signal commutation circuit comprises one 8 passage high speed switching chip, and the multichannel thermopower signal that described 8 passage high speed switching chip are used for described sensor signal conditioning circuit to export exports described ultra high speed A/D conversion circuit to;
Described ultra high speed A/D conversion circuit comprises a high speed 16 AD conversion chip, and described high speed 16 AD conversion chip are used for the multi-path digital temperature signal multichannel thermopower signal that described high speed multichannel signal commutation circuit exports being converted to 16;
Described digital temperature acquisition circuit comprises a digital temperature sensor, and described digital temperature sensor is for gathering the temperature of multiple temp probe and described multi-channel high-speed temperature collecting device tie point position and exporting described main control circuit to after being converted to digital signal;
Described main control circuit is connected with described high speed multichannel signal commutation circuit and described ultra high speed A/D conversion circuit, for carrying out sequential control and temperature channel switching to described 8 passage high speed switching chip and carrying out sequential control to described high speed 16 AD conversion chip, to gather the multi-path digital temperature signal of a time period of 16 AD conversion chip outputs at a high speed and to obtain multichannel average number temperature signal after being averaged to each road of the multi-path digital temperature signal of this time period, and according to the temperature of described quick response temperature sensor and described multi-channel high-speed temperature collecting device tie point position, rear output Transistor-Transistor Logic level signal is corrected to multichannel average number temperature signal,
Described communicating circuit comprises a TTL RS 232 level transferring chip, described communicating circuit is connected with described main control circuit and computing machine, the Transistor-Transistor Logic level signal that described TTL RS 232 level transferring chip is used for described main control circuit to export is converted to RS232 level signal, and described communicating circuit exports the RS232 level signal after conversion to computing machine further;
Described insulating power supply circuit comprises an interconnective insulating power supply module and a filter capacitor, and wherein, described insulating power supply module is connected with described high magnification differential amplifier circuit, for providing positive-negative power for described high magnification differential amplifier circuit.
2. the device for measurement mechanical ventilated patient expiratory air temperature according to claim 1, is characterized in that, described high magnification differential amplifier circuit comprises an operational amplifier chip AD8066.
3. the device for measurement mechanical ventilated patient expiratory air temperature according to claim 1, it is characterized in that, the multichannel thermopower signal that described sensor signal conditioning circuit exports with the frequency of the highest 1MHz by described high speed multichannel signal commutation circuit exports described ultra high speed A/D conversion circuit to.
4. the device for measurement mechanical ventilated patient expiratory air temperature according to claim 1, is characterized in that, 8 passage high speed switching chip in described high speed multichannel signal commutation circuit are ADG508F.
5. the device for measurement mechanical ventilated patient expiratory air temperature according to claim 1, is characterized in that, 16 AD conversion chip of the high speed in described ultra high speed A/D conversion circuit are ADS7805U.
6. the device for measurement mechanical ventilated patient expiratory air temperature according to claim 1, is characterized in that, the digital temperature sensor in described digital temperature acquisition circuit is DS18B20.
7. the device for measurement mechanical ventilated patient expiratory air temperature according to claim 1, is characterized in that, described main control circuit comprises one 8 high-speed microprocessor STC12C5A60S2.
8. the device for measurement mechanical ventilated patient expiratory air temperature according to claim 1, is characterized in that, the insulating power supply module in described insulating power supply circuit is SR12D12.
9. the device for measurement mechanical ventilated patient expiratory air temperature according to claim 1, is characterized in that, the TTL RS 232 level transferring chip in described communicating circuit is MAX232.
10. according to the arbitrary described device for measurement mechanical ventilated patient expiratory air temperature of claim 1-9, it is characterized in that, the number of described temp probe is two, one of them temp probe is arranged on respiratory cycle inhaling air end on the pipeline of patient side, for measuring suction gas temperature; Another temp probe is arranged between tracheal catheter angle coupling and hot and humid area device, for measuring expiratory air temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510144201.3A CN104792429A (en) | 2015-03-30 | 2015-03-30 | Device for measuring temperature of exhaled gas of mechanical ventilation patient |
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| CN201510144201.3A CN104792429A (en) | 2015-03-30 | 2015-03-30 | Device for measuring temperature of exhaled gas of mechanical ventilation patient |
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Application publication date: 20150722 |