CN109431485A - A kind of velocity of blood flow detection device applied in foley's tube - Google Patents
A kind of velocity of blood flow detection device applied in foley's tube Download PDFInfo
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- CN109431485A CN109431485A CN201811313702.XA CN201811313702A CN109431485A CN 109431485 A CN109431485 A CN 109431485A CN 201811313702 A CN201811313702 A CN 201811313702A CN 109431485 A CN109431485 A CN 109431485A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/026—Measuring blood flow
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0271—Thermal or temperature sensors
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Abstract
The invention discloses a kind of velocity of blood flow detection devices applied in foley's tube, comprising: the first velocity of blood flow sensor does not have the other end inner wall of sacculus in foley's tube；The first velocity of blood flow sensor includes the first thermistor and the first microcontroller, wherein: the first thermistor, for the temperature of blood in the arteries outside the foley's tube of its position of real-time detection, and it is converted into corresponding resistance value and exports to the first microcontroller；First microcontroller is connected with the first thermistor, for the resistance value that the first thermistor of real-time reception is sent, judges whether the blood in the arteries outside the foley's tube of the first thermistor position blockage problem occurs.The present invention can real-time measurement foley's tube to the specific expansion and dredging of blood vessel as a result, whether the specific position for judge blood vessel there is also clogging, facilitate medical worker and understand the blood vessel of patient in real time to dredge situation.
Description
Technical field
The present invention relates to blood condition monitoring technical fields, more particularly to a kind of blood stream applied in foley's tube
Speed detector.
Background technique
All the time, cardiovascular disease is all the one of the major reasons of global population's death.Currently, percutaneous coronary is intracavitary
Angioplasty (PTCA) is the treatment most basic most important interventional techniques of coronary atherosclerotic luminal stenosis.The skill
Conduit with sacculus is sent into coronary artery and reaches narrow segment, dilating sacculus makes by art by percutaneous puncture peripheral arterial
Stenosis expands, and blood flow is unimpeded.
Meanwhile Percutenous transluminal coro-nary angioplasty (PTCA) broadly uses bare mental stents and medicament elution
Bracket, these brackets can provide the protection of additional pre- anti-restenosis, while avoid the risk as bypass surgery.
Therefore, the standard for the treatment of coronary heart disease is had become using the angioplasty of the conduit system based on sacculus at present,
Instead of coronary bypass.
But current balloon catheter system, by the cooperation of conduit and sacculus, by the blood vessel passed through carry out expansion with
After dredging processing, the specific expansion and dredging that medical worker can not know blood vessel are as a result, can not judge that conduit and sacculus are passed through
Blood vessel whether there is also cloggings
Therefore, at present there is an urgent need to propose a kind of velocity of blood flow detection device, can real-time measurement foley's tube to blood
The specific expansion and dredging of pipe are as a result, judge that blood vessel that conduit and sacculus are passed through whether there is also clogging, helps to cure
Business personnel understand the blood vessel dredging situation of patient in real time.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of velocity of blood flow detection device applied in foley's tube,
Can real-time measurement foley's tube to the specific expansion and dredging of blood vessel as a result, judging whether is blood vessel that conduit and sacculus are passed through
There is also cloggings, facilitate the blood vessel dredging situation that medical worker understands patient in real time, are conducive to be widely applied, have weight
Big production practices meaning.
For this purpose, the present invention provides a kind of velocity of blood flow detection devices applied in foley's tube, comprising:
First velocity of blood flow sensor does not have the other end inner wall of sacculus in foley's tube；
The first velocity of blood flow sensor includes the first thermistor and the first microcontroller, in which:
First thermistor, the temperature for blood in the arteries outside the foley's tube of its position of real-time detection
Degree, and be converted into corresponding resistance value and export to the first microcontroller；
First microcontroller is connected with the first thermistor, the resistance sent for the first thermistor of real-time reception
Value, when the resistance change amplitude of the first thermistor in the unit time is normal more than or equal to pre-set human vas
Flow velocity is corresponding, the resistance change amplitude min value in the unit time, judges that the sacculus of the first thermistor position is led
Velocity of blood flow is normal in arteries outside pipe, does not block, and otherwise, blockage problem occurs in judgement.
Wherein, first microcontroller is connected with outer computer by liquid metal conducting wire；
First microcontroller, it is outer for the resistance change amplitude of the first thermistor in the unit time to be sent to
Portion's computer；
Outer computer, for being stored in advance and being arranged in the resistance change amplitude of the first thermistor in the unit time
Then one-to-one relationship between blood flowrate is receiving in the unit time that first microcontroller is sent
When the resistance change amplitude of one thermistor, corresponding blood flowrate is read and by display screen real-time display.
Wherein, on the liquid metal conducting wire, the multiple conformal electrodes being spaced apart are also connected with.
Wherein, the liquid metal conducting wire is the snakelike conducting wire repeatedly bent.
Wherein, the first velocity of blood flow sensor further includes primary heater；
First microcontroller, is connected with primary heater, for when the sacculus for judging the first thermistor position
Velocity of blood flow is abnormal in arteries outside conduit, when there is blockage problem, sends triggering enabling signal to primary heater,
So that primary heater starts heating operation, so that primary heater peripheral arteriovascular temperature rises；
Primary heater, for being actuated for heating after receiving the triggering enabling signal that the first microcontroller is sent.
It wherein, further include the second velocity of blood flow sensor, the predeterminated position by the sacculus that foley's tube one end has；
The second velocity of blood flow sensor includes the second thermistor, the second microcontroller and secondary heater, in which:
Second thermistor, the temperature for blood in the arteries outside the foley's tube of its position of real-time detection
Degree, and be converted into corresponding resistance value and export to microcontroller；
Second microcontroller is connected with the second thermistor and secondary heater respectively, for the second heat of real-time reception
The resistance value that quick resistance is sent, when the resistance change amplitude of the second thermistor in the unit time is less than pre-set human body
Blood vessel normal flow is corresponding, resistance change amplitude min value in the unit time when, judge that the second thermistor institute is in place
Velocity of blood flow is abnormal in the arteries outside foley's tube set, and blockage problem occurs, send in real time triggering enabling signal to
Secondary heater, so that secondary heater starts heating operation；
Secondary heater, for being actuated for heating after receiving the triggering enabling signal that the second microcontroller is sent.
By the above technical solution provided by the invention as it can be seen that compared with prior art, the present invention provides a kind of applications
Velocity of blood flow detection device in foley's tube, the flow velocity of the blood by measuring specific position selected in blood vessel,
Can real-time measurement foley's tube to the specific expansion and dredging of blood vessel, as a result, judge the specific position of blood vessel, whether there is also block up
Phenomenon is filled in, facilitates the blood vessel dredging situation that medical worker understands patient in real time, is conducive to be widely applied, there is great production
Practice significance.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram applied to the velocity of blood flow detection device in foley's tube provided by the invention；
A kind of a kind of Fig. 2 structure of embodiment of velocity of blood flow detection device applied in foley's tube provided by the invention
Block diagram；
A kind of one kind of Fig. 3 velocity of blood flow detection device applied in foley's tube provided by the invention in foley's tube
The distribution schematic diagram of embodiment；
Fig. 4 is velocity of blood flow sensing in a kind of velocity of blood flow detection device applied in foley's tube provided by the invention
The encapsulation link position relation schematic diagram of device and liquid metal conducting wire；
Fig. 5 is conformal electrode and liquid in a kind of velocity of blood flow detection device applied in foley's tube provided by the invention
The package position relation schematic diagram of state plain conductor；
Fig. 6 is liquid metal conducting wire in a kind of velocity of blood flow detection device applied in foley's tube provided by the invention
Package position relation schematic diagram.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawing with embodiment to this
Invention is described in further detail.
It is mating the present invention provides a kind of velocity of blood flow detection device applied in foley's tube referring to Fig. 1 to Fig. 6
It is used for protruding into the foley's tube in arteries, one end of the foley's tube has sacculus, which specifically includes: the
One velocity of blood flow sensor 100 does not have the other end inner wall of sacculus in foley's tube；
The first velocity of blood flow sensor 100 includes the first thermistor 101 and the first microcontroller 102, in which:
First thermistor 101, for blood in the arteries outside the foley's tube of its position of real-time detection
Temperature, and be converted into corresponding resistance value and export to the first microcontroller；
First microcontroller 102 is connected with the first thermistor 101, sends out for the first thermistor of real-time reception 101
The resistance value come, be greater than when the resistance change amplitude (i.e. resistance change rate) of the first thermistor 101 in the unit time or
Person is equal to that pre-set human vas normal flow is corresponding, the resistance change amplitude min value in the unit time, judgement
Velocity of blood flow is normal in arteries outside the foley's tube of first thermistor, 101 position, does not block, otherwise,
Judge that velocity of blood flow is abnormal in the arteries outside the foley's tube of 101 position of the first thermistor, blocking occurs and ask
Topic.
In the present invention, it should be noted that foley's tube is currently used for treating coronary heart disease, myocardial infarction disease surgery
In main tool.The application design that the liquid metal that the present invention uses velocity of blood flow in foley's tube detects, in traditional ball
It joined new integrated package on the basis of ductus bursae, for measuring velocity of blood flow, use liquid metal as soft in circuit
Property transmission line, give full play to the tensility and electric conductivity of liquid metal, angioplasty and velocity of blood flow may be implemented and examine
The synchronous of survey carries out, and helps to judge in real time that blood vessel whether there is clogging under current location.
It should also be noted that, the temperature of blood is directly related with the flow velocity of blood, blood for the blood in blood vessel
Flow velocity, the temperature change of blood is influenced whether, when some position (blood vessel position as corresponding to the first velocity of blood flow sensor
Set) velocity of blood flow it is fast when, at this time, the blood of the position does not block, then the blood temperature of the position is high, in unit
Interior amplitude of variation (such as increasing degree or attenuating amplitude) is also big, and foley's tube has good thermal conductivity (catheter wall
It is very thin), so that amplitude of variation of the resistance value of the detected output of thermistor within the unit time is also big, that is to say, that straight
Connect the resistance change speed for influencing thermistor.And when blood flows through the position of blocking, the flow velocity of blood will be slack-off, at this moment
It waits, blocked position amplitude of variation (such as increasing degree or attenuating amplitude) within the unit time is also small, it is not easy to dial
Dynamic, accordingly, thermistor detects the resistance value of the output amplitude of variation within the unit time when detecting to the position
It is small.
Therefore, can be by the unit time for the present invention, temperature-sensitive included by the first velocity of blood flow sensor 100
The resistance value of resistance exports situation of change, dynamic outside the foley's tube for judging 101 position of the first thermistor to correspond to
The flow velocity speed of blood in arteries and veins blood vessel, so that correspondence judges whether that there are blockage problems for the position, velocity of blood flow is fast, and explanation does not have
Blocking, velocity of blood flow is slow, illustrates that there are blockage problems.
In the present invention, in specific implementation, in order to allow the users such as medical worker, the first velocity of blood flow biography can be understood in real time
Sensor 100 arteries stopping state detected, outside its position foley's tube, first microcontroller
102 are connected with outer computer by liquid metal conducting wire 300, and the liquid metal conducting wire 300 extends through foley's tube；
First microcontroller 102, for by the resistance change amplitude of the first thermistor 101 in the unit time
(i.e. resistance change rate) is sent to outer computer；
Outer computer, for being stored in advance and being arranged in the resistance change of the first thermistor 101 in the unit time
Then one-to-one relationship between amplitude (i.e. resistance change rate) and blood flowrate is receiving first microcontroller
In the unit time that device 102 is sent when resistance change amplitude (i.e. the resistance change rate) of the first thermistor 101, reading pair
The blood flowrate answered simultaneously passes through display screen real-time display.
It should be noted that for the present invention, while by liquid metal conducting wire, it can be to 101 He of the first thermistor
First microcontroller, 102 transportation work electric current.
In specific implementation, first thermistor can be PTC thermistor.
In specific implementation, after the liquid metal conducting wire 300 extends through foley's tube, especially by connection gasket 400 with
Outer computer is connected.
It should be noted that the connection gasket of liquid metal conduction is connected to an external computer for the present invention, power supply is played
With the effect of control sensor.There are the connection gasket multiple connection terminals to play wiring for being connected with liquid metals conducting wire
The effect of device.
In the present invention, the liquid metal conducting wire 300 can play conductive effect first, using its flexibility,
When inferior vena cava balloon dilation and contraction, holding circuit is unaffected.Specific structure an are as follows: conductive filament, material are by gallium indium
Made of alloy.
It should be noted that be connected by liquid metal conducting wire connection gasket with external display equipment for the present invention, it is real
Now in the course of surgery, allow medical worker that can be observed in real time the velocity of blood flow in blood vessel.The figure of outer computer
User interface can also guide operator to carry out partial surgical, as measured, after ablation before conduit insertion, ablation or before stimulation
Or it is measured after stimulation.In the whole process, the indexs such as all timing nodes, velocity of blood flow situation are recorded.
In the present invention, in specific implementation, on the liquid metal conducting wire 300, the multiple electricity being spaced apart are also connected with
Pole 500.
As shown in figure 3, this four electrodes, equiform electrode, i.e., conformal electrode, electrode can use common electrode
The shape of material, four electrodes is identical, is that note is attached on foley's tube wall, and the change by measuring potential difference is to detect air bag
Contraction state is in expansion state.
In the present invention, in specific implementation, the liquid metal conducting wire 300 is the snakelike conducting wire repeatedly bent.
It should be noted that using liquid metal as the flexible conductor route in circuit, by the way of serpentine wire
It is connected with velocity of blood flow sensor, has given full play to the tensility and electric conductivity of liquid metal.Simultaneously as normal surgical
Balloon portion in middle foley's tube needs according to circumstances to change size, uses liquid metal as transmission line, it is ensured that
Entire circuit is unaffected.Referring to fig. 4 to shown in Fig. 6, liquid metal conducting wire 300 can specifically be covered using two layers of polyimide
Layer (every layer about 10 microns) is packaged, and can provide insulation and support for intermediate liquid-metal layer.
Shown in Figure 4, in the present invention, the mode that liquid metal conducting wire is all made of Fig. 4 is packaged, using two stratas
Acid imide coating is packaged, and can provide insulation and support for intermediate liquid-metal layer, and liquid metal route is sealed
In foley's tube.
In addition, being located at the first velocity of blood flow sensor of foley's tube distalmost end for the present invention, using thermally conductive epoxy
Material is packaged, and in order to the thermistor for allowing it to have, can preferably sense the temperature change of external blood.
In the present invention, in specific implementation, in order to outside judgement discovery 101 position foley's tube of the first thermistor
When stopping state occurs in blood in the arteries in portion, alleviated in time, the first velocity of blood flow sensor 100 also wraps
Include primary heater 103；
First microcontroller 102, is connected with primary heater 103, judges that 101 institute of the first thermistor is in place for working as
Velocity of blood flow is abnormal in the arteries outside foley's tube set, and when there is blockage problem, sends triggering enabling signal to the
One heater 103, so that primary heater 103 starts heating operation, so that in 103 peripheral arteriovascular temperature of primary heater
It rises, realizes to arterial vascular dilating effect；
Primary heater 103, for being actuated for after receiving the triggering enabling signal that the first microcontroller 102 is sent
Heating.
It should be noted that the temperature of blood vessel increases, and blood vessel can be expanded when the tube wall of heat vasoactive, thus
The speed to promote blood circulation is accelerated.And when the temperature is low, vessel retraction, blood circulation slows down.
In the present invention, in specific implementation, it is contemplated that presence and ball at the sacculus of foley's tube, due to sacculus
When capsule heaves expansion, the blood of blood vessel where sacculus with respect to other positions for, flow velocity is affected to some extent, and flow velocity can be relatively
Relatively slow, therefore, in order to further enhance sacculus to the expansion effect of blood vessel, the invention also includes the second velocity of blood flow sensors
200, the predeterminated position (such as interval pre-determined distance) by the sacculus that foley's tube one end has；
The second velocity of blood flow sensor 200 adds including the second thermistor 201, the second microcontroller 202 and second
Hot device 203, in which:
Second thermistor 201, for blood in the arteries outside the foley's tube of its position of real-time detection
Temperature, and be converted into corresponding resistance value and export to microcontroller；
Second microcontroller 202 is connected, for connecing in real time respectively with the second thermistor 201 and secondary heater 203
Receive the resistance value that the second thermistor 201 is sent, when the second thermistor 201 in the unit time resistance change amplitude (i.e.
Resistance change rate) resistance change amplitude corresponding less than pre-set human vas normal flow, in the unit time
When minimum value, judge that velocity of blood flow is abnormal in the arteries outside the foley's tube of 101 position of the second thermistor, out
Now blockage problem at this time sends triggering enabling signal to secondary heater 203, so that the starting of secondary heater 203 adds in real time
Heat operation, so that 203 peripheral arteriovascular temperature of secondary heater rises, to realize to the arterial vascular expansion beside sacculus
Zhang Zuoyong, enhancing sacculus is to the expansion of blood vessel, dredging effect；
Secondary heater 203, for being actuated for after receiving the triggering enabling signal that the second microcontroller 202 is sent
Heating.
It should be noted that due to the presence of sacculus, it is dynamic outside the foley's tube of 101 position of the second thermistor
Velocity of blood flow occurs abnormal in arteries and veins blood vessel, is the normality under a kind of sacculus operation, that is, it is stifled to will appear certain blood vessel
Plug problem influences the flow velocity of blood, so that slack-off to a certain extent.
In the present invention, in specific implementation, processing operation performed by the second microcontroller 202 can be by the first micro-control
Device 102 processed executes, i.e., integrates the first microcontroller 102 and the second microcontroller 202, at this time, the second blood stream
Fast 200 position of sensor, it is only necessary to place the second thermistor 201 and secondary heater 203.
In the present invention, in specific implementation, the primary heater 103 and secondary heater 203 can be any one
The heater of micromation, for example, miniature ceramic heater.The specific heating method of heater can be with are as follows: by thermistor with after
Electric appliance series connection, so that it may realize the thermostatic control to thermistor.
It should be noted that heating element is placed on beside the thermal resistor of distal end, temperature-sensitive is maintained by feedback loop
The steady temperature of resistance.Blood flow extracts heat from the thermistor of distal end, and the power of heating element will increase, to maintain distal end heat
The given temperature of quick resistance.Proportional integration-derivative keeps constant temperature feedback loop using PID controller, improves the function of heating element
Rate.Equally, when Oligemia, PID controller reduces the power of heating element, and allows distal end thermistor cooling.
It should be noted that shown in Figure 3, second microcontroller 202 is led by liquid metal for the present invention
Line 300 is connected in series, to realize the conduction of operating current with the first microcontroller 102.
Shown in Figure 3, the first velocity of blood flow sensor 100 does not have the other end of sacculus 2 in foley's tube 1
Inner wall；
Second velocity of blood flow sensor 200,2 side of sacculus having positioned at one end (i.e. front end) of foley's tube 1 are preset
Position (such as interval pre-determined distance)；
The liquid metal conducting wire 300 having in the sacculus 2 is connected with four electrodes being spaced apart 500.
Compared with prior art, the present invention is due to taking above technical scheme, with advantageous effects below:
1, using liquid metal as the flexible conductor route in circuit, and serpentine wire is used, has given full play to liquid
The tensility and electric conductivity of state metal.
2, using the mode of heat-sensitive sensor and heater, velocity of blood flow sensor is made, is influenced by velocity of blood flow, heat
The resistance value of quick resistance can change, to realize the real-time detection to velocity of blood flow.
In conclusion compared with prior art, a kind of velocity of blood flow applied in foley's tube provided by the invention
Detection device being capable of real-time measurement foley's tube pair by the flow velocity of the blood of specific position selected in measurement blood vessel
Whether there is also cloggings as a result, judging the specific position of blood vessel for the specific expansion and dredging of blood vessel, facilitate medical worker
The blood vessel for understanding patient in real time dredges situation, is conducive to be widely applied, be of great practical significance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of velocity of blood flow detection device applied in foley's tube characterized by comprising
First velocity of blood flow sensor (100) does not have the other end inner wall of sacculus in foley's tube；
The first velocity of blood flow sensor (100) includes the first thermistor (101) and the first microcontroller (102), in which:
First thermistor (101), for blood in the arteries outside the foley's tube of its position of real-time detection
Temperature, and be converted into corresponding resistance value and export to the first microcontroller；
First microcontroller (102) is connected with the first thermistor (101), is used for the first thermistor of real-time reception (101)
The resistance value sent is set in advance when the resistance change amplitude of the first thermistor (101) in the unit time is more than or equal to
The human vas normal flow set is corresponding, the resistance change amplitude min value in the unit time, judges the first thermistor
(101) velocity of blood flow is normal in the arteries outside the foley's tube of position, does not block, and otherwise, judges to block up
Plug problem.
2. velocity of blood flow detection device as described in claim 1, which is characterized in that first microcontroller (102) and outer
Portion's computer is connected by liquid metal conducting wire (300)；
First microcontroller (102), for sending out the resistance change amplitude of the first thermistor (101) in the unit time
Give outer computer；
Outer computer, for being stored in advance and being arranged in the resistance change width of the first thermistor (101) in the unit time
One-to-one relationship between degree and blood flowrate, then, when receiving the unit that first microcontroller (102) is sent
In the first thermistor (101) resistance change amplitude when, read corresponding blood flowrate and by display screen it is real-time
Display.
3. velocity of blood flow detection device as claimed in claim 2, which is characterized in that on the liquid metal conducting wire (300), also
It is connected with the multiple conformal electrodes (500) being spaced apart.
4. velocity of blood flow detection device as claimed in claim 2, which is characterized in that the liquid metal conducting wire (300) is more
The snakelike conducting wire of secondary bending.
5. velocity of blood flow detection device as described in claim 1, which is characterized in that the first velocity of blood flow sensor
It (100) further include primary heater (103)；
First microcontroller (102) is connected with primary heater (103), for where judging the first thermistor (101)
Velocity of blood flow is abnormal in arteries outside the foley's tube of position, when there is blockage problem, send triggering enabling signal to
Primary heater (103), so that primary heater (103) starts heating operation, so that primary heater (103) Peripheral arteries blood
Tube temperature degree rises；
Primary heater (103), for being actuated for after receiving the triggering enabling signal that the first microcontroller (102) is sent
Heating.
6. the velocity of blood flow detection device as described in any one of claims 1 to 5, which is characterized in that further include the second blood
Flow sensor (200), the predeterminated position by the sacculus that foley's tube one end has；
The second velocity of blood flow sensor (200) includes the second thermistor (201), the second microcontroller (202) and second
Heater (203), in which:
Second thermistor (201), for blood in the arteries outside the foley's tube of its position of real-time detection
Temperature, and be converted into corresponding resistance value and export to microcontroller；
Second microcontroller (202) is connected with the second thermistor (201) and secondary heater (203) respectively, for real-time
The resistance value that the second thermistor (201) is sent is received, when the resistance change width of the second thermistor (201) in the unit time
Degree be less than pre-set human vas normal flow is corresponding, resistance change amplitude min value in the unit time when, sentence
Velocity of blood flow is abnormal in arteries outside the foley's tube of disconnected second thermistor (101) position, blocking occurs and asks
Topic sends triggering enabling signal and gives secondary heater (203), in real time so that secondary heater (203) starts heating operation；
Secondary heater (203), for being actuated for after receiving the triggering enabling signal that the second microcontroller (202) is sent
Heating.
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| CN201811313702.XA CN109431485A (en) | 2018-11-06 | 2018-11-06 | A kind of velocity of blood flow detection device applied in foley's tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111904437A (en) * | 2020-08-07 | 2020-11-10 | 浙江圣纳智能科技有限公司 | Magnetic anti-blocking animal blood drawing bag |
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