CN109464114B - Double-air-supply air path system for endoscope - Google Patents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/012—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor characterised by internal passages or accessories therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
- A61B1/0661—Endoscope light sources
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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Abstract
The invention relates to the technical field of medical equipment and discloses a double-air-supply air channel system for an endoscope, wherein an air channel for providing air for an endoscope body and a carbon dioxide channel for providing carbon dioxide are arranged in a cold light source device, and the air channel and the carbon dioxide channel are respectively connected with a gas switching device; the air path and the carbon dioxide path are connected with the gas output end through the gas switching device. The air gas path and the carbon dioxide gas path are arranged in the cold light source device, and are connected with the gas output end through the gas switching device, so that two gases can be conveniently switched on the cold light source device.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a double-air-supply air path system for an endoscope.
Background
As an endoscope system widely used in the medical field, there is generally provided a water and air feeding system for feeding water and air to an endoscope body, and the air feeding system generally includes air feeding and carbon dioxide feeding. As shown in fig. 1, in the prior art, a carbon dioxide gas path water receiving gas cylinder 2 is arranged outside a cold light source device to supply water and gas for an endoscope body; the air path is arranged in the cold light source device, then water and air are supplied to the endoscope body through the water bottle 1 outside the cold light source device, and no gas flow monitoring is arranged on the air path.
The scheme mainly has the following defects: first, the air gas circuit sets up in the inside of cold light source device, and the carbon dioxide gas circuit sets up in the outside of cold light source device, is difficult to operate the switching of two kinds of gases on cold light source device, and the operation of switching carbon dioxide and air is realized through changing the water gas bottle, and the operation is troublesome relatively. Secondly, the carbon dioxide gas path is generally externally connected with a carbon dioxide gas supply device to provide flow monitoring, but the air path is generally not provided with air flow monitoring, so that the monitoring and control of the air path cannot be realized.
Disclosure of Invention
The invention aims to provide a double-gas supply gas circuit system for an endoscope, which is characterized in that air and carbon dioxide gas passages are arranged in a cold light source device, so that two gases can be conveniently switched on the cold light source device.
In order to achieve the above purpose, the invention adopts the following technical scheme: a double air supply gas circuit system for an endoscope is characterized in that an air gas circuit for providing air and a carbon dioxide gas circuit for providing carbon dioxide are arranged in a cold light source device, and the air gas circuit and the carbon dioxide gas circuit are respectively connected with a gas switching device; the air path and the carbon dioxide path are connected with the gas output end through the gas switching device, and are switched through the gas switching device to output air or carbon dioxide.
In the technical scheme, the air gas path and the carbon dioxide gas path are arranged in the cold light source device, and are connected with the gas output end through the gas switching device, so that two gases can be conveniently switched on the cold light source device.
Further, a flow rate detection device is provided in the air passage. The flow detection device is arranged to monitor the gas flow in the air circuit in real time and is used for monitoring and controlling the flow of the air circuit.
Further, water cylinders are respectively arranged on the air gas path and the carbon dioxide gas path; or the gas output end is connected with a water gas bottle; or is independently provided with a water bottle. Three different connection modes of the air gas path and the carbon dioxide gas path and the water gas bottle.
Further, a first two-position three-way electromagnetic valve is arranged on the carbon dioxide gas path, the first two-position three-way electromagnetic valve is communicated with a first one-way valve, and the first one-way valve is communicated with the gas output end;
the flow detection device comprises a flowmeter arranged on the air path;
the air path is also provided with an air pump, the air outlet of the air pump is communicated with a fourth speed regulating valve, the air outlet of the fourth speed regulating valve is communicated with a flowmeter, the air outlet of the flowmeter is communicated with a second one-way valve, and the second one-way valve is also communicated with the air output end.
In the technical scheme, the first two-position three-way magnetic valve is arranged on the carbon dioxide gas path, the on-off control of the carbon dioxide gas path on carbon dioxide is realized by controlling the on-off of the first two-position three-way magnetic valve, and the flow of carbon dioxide is regulated by the carbon dioxide gas supply device. An air pump is arranged on the air channel, and the on-off control of the air channel on air is realized by the on-off control of the air pump; setting a fourth speed regulating valve to regulate the total flow of air in the air circuit; the flowmeter is arranged to monitor the gas flow in the air passage in real time and feed back the detection signal to the control circuit board of the cold light source device so as to monitor and control the flow of the air passage.
Further, a gas supply device for supplying carbon dioxide is provided outside the cold light source device. The carbon dioxide gas supply device with larger volume is arranged outside the cold light source device, so that the volume of the cold light source device is reduced.
Further, the first two-position three-way electromagnetic valve is also communicated with a first speed regulating valve communicated with the outside, the air outlet of the first two-position three-way electromagnetic valve is communicated with the air inlet of the first one-way valve, and the air outlet of the first two-position three-way electromagnetic valve is communicated with the air inlet of the first speed regulating valve. The first speed regulating valve mainly plays a safety role, when the carbon dioxide gas path is not conducted, gas is discharged, the situation that higher air pressure is kept in the carbon dioxide gas path is avoided, and risks are reduced.
Further, a second two-position three-way electromagnetic valve is arranged between the air outlet of the air pump and the fourth speed regulating valve; the air release port of the second two-position three-way electromagnetic valve is communicated with the air inlet of the fourth speed regulating valve; the air outlet of the second two-position three-way electromagnetic valve is communicated with a second speed regulating valve communicated with the outside.
The air release port of the second two-position three-way electromagnetic valve is communicated with the air inlet of the fourth speed regulating valve, so that when the air pump is electrified, air is always in the air path; when the air is discharged from the second speed regulating valve, the air flow in the air path is reduced, so that the air flow is set to be in two gears according to the requirement.
Further, the air path further comprises a third two-position three-way electromagnetic valve arranged between the second two-position three-way electromagnetic valve and the fourth speed regulating valve, a deflation port of the second two-position three-way electromagnetic valve is communicated with an air inlet of the third two-position three-way electromagnetic valve, a deflation port of the third two-position three-way electromagnetic valve is communicated with an air inlet of the fourth speed regulating valve, and an air outlet of the third two-position three-way electromagnetic valve is communicated with a third speed regulating valve communicated with the outside.
By additionally arranging the third two-position three-way electromagnetic valve and the third speed regulating valve, when gas is discharged from the third speed regulating valve, the air flow in the air path can be reduced again, so that the air flow is set to be in a third gear according to the requirement.
Further, the air circuit also includes a pressure sensor disposed proximate to the flow meter. The air pressure of the air circuit is effectively monitored, unsafe factors caused by overlarge air pressure when faults occur are avoided, and therefore the safety performance of the system is improved.
Further, the air outlets of the first speed regulating valve and/or the second speed regulating valve and/or the third speed regulating valve are/is positioned in the cold light source device. The gas discharged from the device can assist in heat dissipation of the cold light source device, and is reasonably utilized.
Compared with the prior art, the invention has the following beneficial effects:
(1) The air supply or the switching of air and carbon dioxide is operated on the cold light source device through keys, so that the effect that the hardware equipment can be replaced in the prior art is replaced, and the operation is simpler.
(2) The pressure relief device is arranged on the carbon dioxide gas path, so that the safety of the system is improved when the carbon dioxide gas path is closed.
(3) The air passage realizes the regulation function of ventilation flow through the electromagnetic valve and the speed regulating valve with small volume, and reduces the volume of the system.
(4) The flowmeter and the pressure sensor of the air passage effectively monitor the gas flow or the gas pressure, avoid unsafe factors caused by too high air pressure or too high flow when faults occur, and improve the safety performance of the system.
Drawings
FIG. 1 is a schematic diagram of a gas delivery flow path for an endoscope gas delivery system of the prior art.
Fig. 2 is a schematic diagram of the front end of the cold light source device.
Fig. 3 is a schematic structural diagram of an air path system disposed inside the cold light source device.
Fig. 4 is a schematic structural diagram of a gas path system disposed inside the cold light source device.
Detailed Description
The invention is described in further detail below by way of specific embodiments:
reference numerals in the drawings of the specification include: the cold light source device 100, the carbon dioxide gas circuit 10, the first two-position three-way electromagnetic valve 101, the first speed regulating valve 102, the first one-way valve 103, the water gas bottle 20, the air gas circuit 30, the air pump 301, the second two-position three-way electromagnetic valve 302, the second speed regulating valve 303, the third two-position three-way electromagnetic valve 304, the third speed regulating valve 305, the fourth speed regulating valve 306, the flowmeter 307, the second one-way valve 308, the pressure sensor 309, the endoscope body 40, the control panel 50, the gas switching button 501, the air flow button 502, the light output hole 601, the gas output end 602, and the carbon dioxide gas supply device 70.
Example 1
The embodiment is substantially as shown in fig. 2 and 3: a double air supply path system for an endoscope is provided, wherein a carbon dioxide air supply device 70 is arranged outside a cold light source device 100, an air bottle 20 is hung on the side wall of the cold light source device 100, and an air path 30 for supplying air to an endoscope body 40 and a carbon dioxide air path 10 communicated with the carbon dioxide air supply device 70 are arranged inside the cold light source device 100. The air path 30 and the carbon dioxide path 10 are respectively connected with a gas switching device, and the air path 30 and the carbon dioxide path 10 are converged at a gas output end 602 on the cold light source device 100 through the gas switching device. The gas output end 602 (outputting carbon dioxide or air) is connected with the water-gas bottle 20, and a water outlet and an air outlet which are communicated with the endoscope body are arranged on the water-gas bottle 20, and the water outlet provides water for the endoscope body 40 or the air outlet provides air or carbon dioxide. The gas output end 602 is connected with the water vapor bottle 20, and water in the water vapor bottle 20 is pressed out by the gas pressure without a water pump. Of course, the air channel 30 and the carbon dioxide channel 10 are respectively provided with the water gas bottle 20; alternatively, as shown in fig. 4, the water cylinder 20 is provided separately from the air path 30 and the carbon dioxide path 10, but water is supplied by a water pump.
The carbon dioxide gas circuit 10 is provided with a first two-position three-way electromagnetic valve 101 communicated with the gas outlet of the carbon dioxide gas supply device 70, preferably a 3V106FI1F normally closed electromagnetic valve of Addren, the first two-position three-way electromagnetic valve 101 comprises a gas inlet, a gas outlet and a gas release port, the gas inlet is always communicated with the gas release port, and the gas inlet is communicated with the gas outlet or is cut off by controlling the on-off of the first two-position three-way electromagnetic valve 101, so that the on-off control of the carbon dioxide gas circuit 10 on carbon dioxide is realized. The air outlet of the first two-position three-way electromagnetic valve 101 is communicated with a first one-way valve 103, and the air outlet of the first one-way valve 103 is communicated with an air output end 602 through an air pipe; the air release port of the first two-position three-way electromagnetic valve 101 is communicated with a first speed regulating valve 102, preferably a PSL401A-S speed regulating valve of Adand, and the air outlet of the first speed regulating valve 102 is positioned in the cold light source device 100.
The first check valve 103 is used to ensure that the carbon dioxide gas can only flow forward toward the endoscope body 40, and to prevent the gas generated by various reasons from flowing backward toward the inside of the cold light source device 100. The first speed regulating valve 102 has the function that when the carbon dioxide gas channel 10 is not conducted, the two-position three-way electromagnetic valve discharges carbon dioxide gas through the first speed regulating valve 102, the flow rate of discharged gas can be regulated in advance according to the first speed regulating valve 102, the higher air pressure in the carbon dioxide gas channel 10 is avoided, and the risk is reduced. Because the carbon dioxide gas supply device 70 is externally connected to the cold light source device 100 and is provided with an independent flow regulating device, the first speed regulating valve 102 mainly plays a role in safety, and only a small part of gas can be discharged in the cold light source device 100 during the working process.
The air path 30 comprises an air pump 301 positioned in the cold light source device 100, an air outlet of the air pump 301 is sequentially communicated with a second two-position three-way electromagnetic valve 302, a third two-position three-way electromagnetic valve 304, a fourth speed regulating valve 306, a pressure sensor 309, a flowmeter 307 and a second one-way valve 308, and the second one-way valve 308 is communicated with an air output end 602 through an air pipe. The second and third two-position three- way solenoid valves 302, 304 are preferably of the Adam 3V106FI2F type, which also include an air inlet, an air outlet, and a bleed port, with the air inlet always communicating with the bleed port. The air release port of the second two-position three-way electromagnetic valve 302 is communicated with the air inlet of the third two-position three-way electromagnetic valve 304, the air outlet of the second two-position three-way electromagnetic valve 302 is communicated with the second speed regulating valve 303, and the air outlet of the second speed regulating valve 303 is positioned in the cold light source device 100, so that the released air can assist in heat dissipation of the interior of the cold light source device 100. The air release port of the third two-position three-way electromagnetic valve 304 is communicated with the air inlet of the fourth speed regulating valve 306; the air outlet of the third two-position three-way electromagnetic valve 304 is communicated with a third speed regulating valve 305, and the air outlet of the third speed regulating valve 305 is also positioned in the cold light source device 100.
The second speed valve 303, the third speed valve 305 and the fourth speed valve 306 are also preferably PSL401A-S normally closed speed valves of aldrich. The second two-position three-way solenoid valve 302 controls whether the gas is discharged from the second speed valve 303, and when the gas is discharged from the second speed valve 303, the air flow rate in the air path 30 is reduced. The third two-position three-way solenoid valve 304 controls whether the gas is discharged from the third speed valve 305, and when the gas is discharged from the third speed valve 305, the air flow in the air path 30 is also reduced. The fourth speed valve 306 functions to regulate the total flow of air in the air circuit 30. The second speed valve 303 and the third speed valve 305 are used to adjust the magnitude of the bleed, so that the flow rate of the air path 30 has three steps of large, medium and small.
The pressure sensor 309 is preferably model MP3V5050GP series 98ASA99303D of the enzhps, and is used for monitoring the gas pressure in the air path 30 in real time, and feeding back the detection signal to the control circuit board of the cold light source device 100, so as to monitor and control the pressure of the air path 30. The flowmeter 307 is preferably model D6F-10a61-000 of ohmmeter, which is used to monitor the gas flow in the air path 30 in real time and feed back the detection signal to the control circuit board of the cold light source device 100 for monitoring and controlling the flow of the air path 30. The second check valve 308 ensures that air in the air path 30 can only flow forward toward the endoscope body 40, preventing gases generated for various reasons from flowing backward toward the inside of the cold light source device 100.
The first two-position three-way electromagnetic valve 101, the second two-position three-way electromagnetic valve 302, the third two-position three-way electromagnetic valve 304, the flow meter 307, the pressure sensor 309, and the air pump 301 are electrically connected with the control circuit board of the cold light source device 100.
As shown in fig. 2, the gas output port 602 and the light output hole 601 are located at the front end of the cold light source device 100. An air flow button 502 is provided on the control panel 50 at the front end of the cold light source device 100, and the air flow button 502 controls the air flow in the air path 30, specifically: 1) When the air flow button 502 is pressed, the air pump 301 is electrified, the second two-position three-way electromagnetic valve 302 and the third two-position three-way electromagnetic valve 304 are electrified, the air inlets of the two-position three-way electromagnetic valve 302 and the third two-position three-way electromagnetic valve 304 are simultaneously communicated with the air outlet and the air discharge port, part of air is discharged from the air outlet of the second speed regulating valve 303, and part of air is discharged from the air outlet of the third speed regulating valve 305; i.e. open the air circuit 30 and is the minimum flow stop. 2) Pressing the air flow button 502 again, the third two-position three-way electromagnetic valve 304 is powered off, and the air inlet is only communicated with the air discharge port, so that no air is discharged from the air outlet of the third speed regulating valve 305; i.e. regulating the air flow to mid range. 3) Pressing the air flow button 502 again, the second two-position three-way electromagnetic valve 302 is powered off, and the air inlet is only communicated with the air discharge port, so that no air is discharged from the air outlet of the second speed regulating valve 303; i.e. regulating the air flow to maximum. 4) Pressing the air flow button 502 again turns off the air pump 301, i.e., closes the air path 30. The circulation is realized, and the air channel 30 is communicated and cut off, and the air flow in the air channel 30 is regulated. The air flow button 502 may be implemented using a conventional multi-position push button switch or a multi-position rotary switch, and the specific connection and operation may be implemented using conventional techniques, which are not described in detail herein.
As shown in fig. 2, the gas switching device includes a gas switching button 501 provided on the control panel 50, and when the carbon dioxide gas supply device 70 is turned on for supplying gas, the gas switching button 501 performs a switching operation between carbon dioxide and air, specifically: 1) When the gas switching button 501 is pressed once, the first two-position three-way electromagnetic valve 101 is electrified, the air inlet of the first two-position three-way electromagnetic valve 101 is simultaneously communicated with the air discharge port and the air outlet, and the air pump 301 is simultaneously powered off; i.e. the carbon dioxide gas circuit 10 is open while the air gas circuit 30 is closed. 2) Pressing the gas switching button 501 again, and powering off the first two-position three-way electromagnetic valve 101, wherein the gas inlet of the first two-position three-way electromagnetic valve 101 is only communicated with the gas discharge port; i.e. the carbon dioxide gas circuit 10 is closed. The gas switch button 501 may be an existing multi-gear push button switch or a multi-gear knob switch, and the specific connection and operation may be a conventional manner, which will not be described in detail herein.
Example two
The difference between this embodiment and the first embodiment is that when the air flow button 502 in fig. 2 is operated, the air discharging process in the air path 30 is different, specifically: as shown in fig. 3, the air outlet amount of the air outlet of the third speed adjusting valve 305 is adjusted in advance to be a, the air outlet amount of the air outlet of the second speed adjusting valve 303 is adjusted to be B, and a is smaller than B. 1) Pressing an air flow button 502, electrifying the air pump 301, electrifying the second two-position three-way electromagnetic valve 302 and the third two-position three-way electromagnetic valve 304, enabling air inlets of the second two-position three-way electromagnetic valve 302 and the third two-position three-way electromagnetic valve 304 to be simultaneously communicated with an air outlet and an air discharge opening, discharging part of air from the air outlet of the second speed regulating valve 303, discharging part of air from the air outlet of the third speed regulating valve 305, and enabling the total discharge air quantity to be A and B; i.e. open the air circuit 30 and is the minimum flow stop. 2) Then the air flow button 502 is pressed, the third two-position three-way electromagnetic valve 304 is powered off, and the air inlet of the three-way electromagnetic valve is only communicated with the air discharge port, so that no air is discharged from the air outlet of the third speed regulating valve 305, only part of air is discharged from the air outlet of the second speed regulating valve 303, and the total discharged air quantity is B; i.e. regulating the air flow to mid range. 3) Then the air flow button 502 is pressed, the second two-position three-way electromagnetic valve 302 is powered off, and the air inlet of the second two-position three-way electromagnetic valve 302 is only communicated with the air discharge port, so that no air is discharged from the air outlet of the second speed regulating valve 303, only part of air is discharged from the air outlet of the third speed regulating valve 305, and the total discharge amount is A; i.e. regulating the air flow to maximum. 4) Pressing the air flow button 502 again turns off the air pump 301, i.e., closes the air path 30. The circulation is realized, and the air channel 30 is communicated and cut off, and the air flow in the air channel 30 is regulated.
It should be noted that, in the first embodiment and the second embodiment, only two specific operation procedures for adjusting the air flow in the air path 30 through the air flow button 502 are illustrated, and in fact, other manners may be adopted, for example, after the step 3) of the second embodiment, when the air flow button 502 is pressed, the second two-position three-way electromagnetic valve 302 and the third two-position three-way electromagnetic valve 304 are powered off, and the flow is larger than that in the step 3), so that the air flow can be set to four steps.
While only the preferred embodiments of the present invention have been described above, it should be noted that it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention, and these should also be considered as the scope of the invention, which does not affect the effect of the practice of the invention and the utility of the patent. The technology, shape, and construction parts omitted herein are all known in the art.
Claims (9)
1. A double air supply gas circuit system for an endoscope is characterized in that: an air gas path for providing air and a carbon dioxide gas path for providing carbon dioxide are arranged in the cold light source device, and the air gas path and the carbon dioxide gas path are respectively connected with the gas switching device; the air circuit and the carbon dioxide circuit are connected with the gas output end through a gas switching device, and are switched through the gas switching device to output air or carbon dioxide;
the carbon dioxide gas path is provided with a first two-position three-way electromagnetic valve which is communicated with a first one-way valve, and the first one-way valve is communicated with a gas output end;
a flow detection device is arranged on the air path, and the flow detection device comprises a flowmeter arranged on the air path;
the air path is also provided with an air pump, the air outlet of the air pump is communicated with a fourth speed regulating valve, the air outlet of the fourth speed regulating valve is communicated with the flowmeter, the air outlet of the flowmeter is communicated with a second one-way valve, and the second one-way valve is also communicated with the gas output end;
water cylinders are respectively arranged on the air path and the carbon dioxide path; or the gas output end is connected with a water gas bottle; or is independently provided with a water bottle.
2. A dual gas supply circuit system for an endoscope according to claim 1 and wherein: the air supply device for supplying carbon dioxide is arranged outside the cold light source device.
3. A dual gas supply circuit system for an endoscope according to claim 2 and wherein: the first two-position three-way electromagnetic valve is also communicated with a first speed regulating valve communicated with the outside, the air outlet of the first two-position three-way electromagnetic valve is communicated with the air inlet of the first one-way valve, and the air outlet of the first two-position three-way electromagnetic valve is communicated with the air inlet of the first speed regulating valve.
4. A dual gas supply circuit system for an endoscope according to claim 1 and wherein: a second two-position three-way electromagnetic valve is also arranged between the air outlet of the air pump and the fourth speed regulating valve; the air release port of the second two-position three-way electromagnetic valve is communicated with the air inlet of the fourth speed regulating valve; the air outlet of the second two-position three-way electromagnetic valve is communicated with a second speed regulating valve communicated with the outside.
5. The dual gas supply path system for an endoscope according to claim 4, wherein: the air circuit also comprises a third two-position three-way electromagnetic valve arranged between the second two-position three-way electromagnetic valve and the fourth speed regulating valve, the air discharge port of the second two-position three-way electromagnetic valve is communicated with the air inlet of the third two-position three-way electromagnetic valve, the air discharge port of the third two-position three-way electromagnetic valve is communicated with the air inlet of the fourth speed regulating valve, and the air outlet of the third two-position three-way electromagnetic valve is communicated with a third speed regulating valve communicated with the outside.
6. A dual gas supply circuit system for an endoscope according to claim 1 and wherein: the air circuit also includes a pressure sensor disposed immediately adjacent to the flow meter.
7. A dual gas supply circuit system for an endoscope according to claim 3 and wherein: the air outlet of the first speed regulating valve is positioned in the cold light source device.
8. The dual gas supply path system for an endoscope according to claim 4, wherein: and an air outlet of the second speed regulating valve is positioned in the cold light source device.
9. The dual gas supply path system for an endoscope according to claim 5, wherein: and an air outlet of the third speed regulating valve is positioned in the cold light source device.
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| CN201910022065.9A CN109464114B (en) | 2019-01-10 | 2019-01-10 | Double-air-supply air path system for endoscope |
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| CN201910022065.9A CN109464114B (en) | 2019-01-10 | 2019-01-10 | Double-air-supply air path system for endoscope |
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