CN117607496A - Flow rate calibration method for warming infusion system - Google Patents
Flow rate calibration method for warming infusion system Download PDFInfo
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- CN117607496A CN117607496A CN202311571108.1A CN202311571108A CN117607496A CN 117607496 A CN117607496 A CN 117607496A CN 202311571108 A CN202311571108 A CN 202311571108A CN 117607496 A CN117607496 A CN 117607496A
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- heating
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- flow rate
- power
- infusion system
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- 238000001802 infusion Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000010792 warming Methods 0.000 title claims description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 103
- 238000013507 mapping Methods 0.000 claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims description 82
- 239000003978 infusion fluid Substances 0.000 claims description 12
- 230000002572 peristaltic effect Effects 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000003993 interaction Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 4
- 238000013461 design Methods 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
- G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention provides a flow rate calibration method for a heating infusion system, which uses the existing calibration heating power of a speed measurement heating lamp tube, does not need to additionally adjust the output power of the speed measurement heating lamp tube, has no requirement on the accuracy and the stepping of the adjustment of the output power, can avoid the problems of high design cost and high difficulty of the existing power calibration method, and simultaneously, calibrates based on the mapping relation between the heating power of the speed measurement heating lamp tube and the heat absorption power of a pipeline, does not need to calculate the flow rate first, calibrates the flow rate through an error coefficient instead of calculating the flow rate first as the existing flow rate calibration method, can avoid the deviation of the calculation transition of the flow rate caused by the critical flow rate and the power switching in the existing flow rate calibration method, and has wide application range and high calibration accuracy.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a flow rate calibration method for a warming infusion system.
Background
At present, the heating infusion system generally has a flow rate display function, and when medical staff manually adjusts the flow rate of perfusion liquid, the heating infusion system can measure and display the flow rate in real time, so that the medical staff can conveniently adjust the flow rate to an expected value.
The flow rate measuring method of the heating infusion system is to heat a pipeline through an infrared lamp tube with set power, read the temperature difference of two points of liquid in the pipeline after the temperature difference is stabilized, calculate the flow rate of the liquid in the pipeline, and the flow rate measuring result is related to the absorption power and the temperature difference of the pipeline. At present, the heating infusion system changes the absorption power of the pipeline under the condition of setting the same heating power of the infrared lamp tube due to the structural difference of the device, ageing of the infrared lamp tube after long-time operation and the like, so that the accuracy of flow velocity measurement calculation is reduced. The current solution is to calibrate the system in a power calibration method, a flow rate calibration method and other ways.
The power calibration method is that under the condition of determining the actual flow rate of liquid, the output power of the heating infrared lamp tube is regulated, the temperature difference value between two points of a pipeline is recalibrated, the calculated value and the actual value meet the measurement requirement, the output power values of the infrared lamp tube with a plurality of flow rate segments are recorded, in the follow-up speed measurement process, the calibrated output power values of the infrared lamp tube are used for controlling the heating of the lamp tube, and then the flow rate is measured by adopting the original method. The method has the following defects:
1. the output power of the infrared speed measuring lamp tube is required to be adjustable in a wide range;
2. the output power adjustment of the speed measuring infrared lamp tube has high accuracy and small step;
3. the design cost is high, and the difficulty is high.
The flow rate calibration method is to record the deviation ratio of the actual flow rate value and the calculated flow rate value under a plurality of flow rate segments simultaneously under the condition of determining the actual flow rate of the liquid, and record the deviation ratio as an error coefficient, and process the current calculated value based on the same error coefficient to obtain the final flow rate when measuring the flow rate. The method has the following defects:
1. power switching of different flow rates can lead to abrupt changes in computation, resulting in error coefficient usage fields Jing Shouxian;
2. processing is carried out after the flow rate is calculated, and output can be directly influenced in critical time;
3. the error is big, and control is difficult.
Disclosure of Invention
In view of the above, a flow rate calibration method for a warming infusion system is provided.
The technical scheme adopted by the invention is as follows:
a method of flow rate calibration for a warming infusion system, comprising:
a mapping relation establishing step:
determining v through a preset first mapping relation of p_heat and v, wherein the p_heat represents the calibrated heating power of a speed measuring heating lamp tube of a heating module of a heating infusion system, and the v represents the flow rate of liquid inlet;
according to the determined v, injecting the liquid at the target temperature into a pipeline of the heating module, and heating the injected liquid by the speed measuring heating lamp tube with the calibrated heating power;
determining the temperature difference delta t before and after heating the liquid, and calculating the current heat absorption power p_absorb of the pipeline according to the formula (1):
p_absorb＝Δt*v*k (1)，
wherein k is a fixed coefficient;
establishing a second mapping relation between the calibrated heating power p_heat and the endothermic power p_absorber;
calibrating the flow rate:
in the process of measuring the flow rate of the infusion liquid by the heating infusion system, determining the temperature difference delta T before and after heating the infusion liquid, determining the heat absorption power p_absorb according to the second mapping relation, and calculating the flow rate V of the infusion liquid according to a formula (2):
V＝p_absorb/(ΔT*k) (2)。
the invention uses the existing calibration heating power of the speed measurement heating lamp tube, does not need to additionally adjust the output power of the speed measurement heating lamp tube, has no requirement on the accuracy and the stepping of the adjustment of the output power, can avoid the problems of high design cost and high difficulty of the existing power calibration method, and simultaneously, calibrates based on the mapping relation of the heating power of the speed measurement heating lamp tube and the heat absorption power of a pipeline, does not need to calculate the flow velocity first, calibrates the flow velocity through error coefficients instead of calculating the flow velocity first as in the existing flow velocity calibration method, can avoid the deviation of the calculation transition of the flow velocity caused by the critical flow velocity and the power switching in the existing flow velocity calibration method, has wide application range and high calibration accuracy.
Drawings
The invention is described in detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic diagram of an implementation of a flow rate calibration method for a warming infusion system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a heating infusion system according to an embodiment of the invention, generally indicated at Wen Haocai;
FIG. 3 is a schematic view of a heating plate of a warming infusion system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a flow rate calibration fixture according to an embodiment of the invention;
FIG. 5 is a schematic electrical diagram of a flow rate calibration fixture according to an embodiment of the present invention;
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. The embodiments described in the present specification are not intended to be exhaustive or to represent the only embodiments of the present invention. The following examples are presented for clarity of illustration of the invention of the present patent and are not intended to limit the embodiments thereof. It will be apparent to those skilled in the art that various changes and modifications can be made in the embodiment described, and that all the obvious changes or modifications which come within the spirit and scope of the invention are deemed to be within the scope of the invention.
The embodiment of the invention provides a flow rate calibration method for a heating infusion system, which is realized by matching a heating infusion system 1 with a flow rate calibration jig 2, and is shown in fig. 1.
The warming infusion system 1 has a warming module 110, as shown in fig. 2 and 3, the warming module 110 has a warming consumable 111 and a heating plate 112, the warming consumable 111 has a serpentine pipe, fig. 2 shows an inlet 111a and an outlet 111b of the pipe, and the heating plate 112 has a speed measuring heating lamp 112a, which can heat the front section of the pipe.
As shown in fig. 2, the heating module 110 may detect the liquid inlet temperature (the liquid temperature before heating) at the point a, and detect the liquid temperature after being heated by the tacho heating tube 112a at the point B, so as to obtain the temperature difference before and after heating the liquid.
Wherein, the tach heating tube 112a generally has a plurality of power steps.
As shown in fig. 1, 4 and 5, the flow rate calibration jig 2 includes a housing 210, a temperature adjusting member 220, a peristaltic pump 230, a first liquid pipe 240, a second liquid pipe 250 and a controller 260.
The housing 210 has a first liquid chamber 211 and a second liquid chamber 212, wherein the first liquid chamber 211 is provided with liquid, the second liquid chamber 212 is used for collecting liquid, and in this embodiment, the volumes of the first liquid chamber 211 and the second liquid chamber 212 are equal to each other and are 1.5 liters.
The housing 210 has two quick connectors 213, operation buttons 214 and a display 215 for user interaction, and a communication interface 216.
The temperature adjusting member 220 is disposed in the first liquid chamber 211, and is used for adjusting (raising or lowering) the liquid in the first liquid chamber 211 to a target temperature, and in this embodiment, the temperature adjusting member 220 adopts a semiconductor refrigeration piece, which is disposed on an inner wall of the first liquid chamber 211, for example, may be disposed on a bottom surface of the inner wall. In order to maintain the liquid at the target temperature, the inner wall of the first liquid chamber 211 is covered with a heat insulating material layer at a portion other than the portion where the semiconductor cooling fin is provided.
The peristaltic pump 230 is used for accurately controlling the flow rate of the liquid, and is fixed on the housing 210, the first liquid pipe 240 passes through the pump head of the peristaltic pump 230, one end of the first liquid pipe is connected with the first liquid chamber 211 through one quick-mounting connector 213, the other end of the first liquid pipe is connected with the pipeline inlet 111a of the heating module 110, one end of the second liquid pipe 250 is connected with the second liquid chamber 212 through the other quick-mounting connector 213, and the other end of the second liquid pipe is connected with the pipeline outlet 111b of the heating module 110.
The controller 260 may be a single-chip microcomputer, which is in signal connection with the heating module 110 of the heating infusion system 1 through the communication interface 216 and the communication line 3, and the controller 260 is also in signal connection with the temperature adjusting member 220, the peristaltic pump 230, the operation keys 214 and the display screen 215, see fig. 1 and 5.
Assume that the tachometer heating tube 112a has three power steps, corresponding to three nominal heating powers, respectively: the heating infusion system 1 is preset with first mapping relations of first power p_heat1 and v1, first power p_heat2 and v2 and first power p_heat3 and v3 in one-to-one correspondence, and v1, v2 and v3 are all liquid inlet flow rates. The specific flow of the method of the embodiment of the invention is as follows:
s101, the heating infusion system 1 and the flow rate calibration jig 2 are communicated.
S102, the warming infusion system 1 determines the flow velocity v1 according to a preset first mapping relation between p_heat1 and v1.
S103, the flow rate calibration fixture 2 obtains the flow rate v1 and the target temperature (20 ℃ for example) from the warming infusion system 1, adjusts the temperature of the liquid in the first liquid cavity to the target temperature through the temperature adjusting piece 220, injects the liquid at the target temperature into the pipeline of the warming module 110 at the flow rate v1 through the peristaltic pump 230, and heats the injected liquid by the tachogenesis heating lamp 112a with the calibrated heating power p_heat 1.
S104, the warming infusion system 1 determines the temperature difference delta t1 before and after the liquid is heated by the speed measuring heating lamp tube 112a, and calculates the current heat absorption power p_absorb1 of the pipeline according to the formula (1):
p_absorb1＝Δt1*v1*k (1)
wherein k is a fixed coefficient and is obtained by calculating parameters such as specific heat capacity in advance.
S105, the warming infusion system 1 establishes a second mapping relation between the calibrated heating power p_heat1 and the endothermic power p_absorb 1.
S106, repeating S101-S105, the warming infusion system 1 can establish a second mapping relation between the calibrated heating power p_heat2 and the heat absorption power p_absorp2, and establish a second mapping relation between the calibrated heating power p_heat3 and the heat absorption power p_absorp3.
The liquid is collected by the second liquid chamber 212 after passing through the heating module 110, so that the liquid is prevented from directly returning to the first liquid chamber 211 to influence the temperature of the liquid in the first liquid chamber 211. After S106 is completed, the liquid in the first liquid chamber 211 is just completely collected in the second liquid chamber 212, and at this time, the peristaltic pump 230 is controlled to work reversely, so that the liquid in the second liquid chamber 212 returns to the first liquid chamber 211 through the heating module 110.
Of course, if the tachometer heating tube 112a has only one power gear, S101-S105 need only be completed once, and S106 may be omitted.
S107, in the process of measuring the flow rate of the infusion liquid by the heating infusion system 1, the heating infusion system 1 determines the temperature difference delta T before and after the infusion liquid is heated by the speed measurement heating lamp 112a and the current power gear of the speed measurement heating lamp 112a, determines the corresponding calibration heating power according to the current power gear of the speed measurement heating lamp, determines the corresponding heat absorption power from the corresponding second mapping relation according to the determined calibration heating power, and finally calculates the flow rate of the infusion liquid according to the heat absorption power.
If the current power gear of the tacho heating tube 112a is the second gear, that is, the nominal heating power is the second power p_heat2, so that the corresponding endothermic power is p_absorb2 can be determined, and finally, the flow velocity V of the infusion liquid is calculated according to the formula (2):
V＝p_absorb2/(ΔT*k) (2)。
as can be seen from the above, the method of the embodiment uses the existing calibration heating power of the speed measurement heating lamp tube, and does not need to additionally adjust the output power of the speed measurement heating lamp tube, so that the accuracy and the stepping of the adjustment of the output power are not required, the problems of high design cost and high difficulty of the existing power calibration method can be avoided, meanwhile, the method of the embodiment calibrates based on the mapping relation between the heating power of the speed measurement heating lamp tube and the heat absorption power of the pipeline, and does not need to calculate the flow velocity first, and calibrates the flow velocity through an error coefficient instead of calculating the flow velocity first as in the existing flow velocity calibration method, so that the deviation of the calculation transition of the flow velocity caused by the critical flow velocity and power switching in the existing flow velocity calibration method can be avoided, the application range is wide, and the calibration accuracy is high.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (9)
1. A method of flow rate calibration for a warming infusion system, comprising:
a mapping relation establishing step:
determining v through a preset first mapping relation of p_heat and v, wherein the p_heat represents the calibrated heating power of a speed measuring heating lamp tube of a heating module of a heating infusion system, and the v represents the flow rate of liquid inlet;
according to the determined v, injecting the liquid at the target temperature into a pipeline of the heating module, and heating the injected liquid by the speed measuring heating lamp tube with the calibrated heating power;
determining the temperature difference delta t before and after heating the liquid, and calculating the current heat absorption power p_absorb of the pipeline according to the formula (1):
p_absorb＝Δt*v*k (1)，
wherein k is a fixed coefficient;
establishing a second mapping relation between the calibrated heating power p_heat and the endothermic power p_absorber;
calibrating the flow rate:
in the process of measuring the flow rate of the infusion liquid by the heating infusion system, determining the temperature difference delta T before and after heating the infusion liquid, determining the heat absorption power p_absorb according to the second mapping relation, and calculating the flow rate V of the infusion liquid according to a formula (2):
V＝p_absorb/(ΔT*k) (2)。
2. the method for calibrating the flow rate of a warming infusion system according to claim 1, wherein the calibrated heating power of the tachometer heating tube has a plurality of power gears, and a first mapping relation between the calibrated heating power of different power gears and the corresponding inflow flow rate v is preset;
and repeating the step of establishing the mapping relation, and establishing a second mapping relation of one-to-one correspondence between the calibrated heating power of different gears and the corresponding heat absorption power.
3. A method of calibrating a flow rate for a warming infusion system according to claim 2, wherein the step of calibrating the flow rate further comprises:
determining the current power gear of the speed measurement heating lamp tube, determining corresponding calibration heating power according to the current power gear of the speed measurement heating lamp tube, and determining corresponding heat absorption power from a corresponding second mapping relation according to the determined calibration heating power.
4. A method for calibrating flow rate for a warming infusion system according to any of claims 1-3, wherein in the step of establishing a mapping relationship:
the heating infusion system establishes communication with the flow rate calibration jig;
the warming infusion system determines v through a preset first mapping relation of p_heat and v;
the flow rate calibration device acquires the flow rate v and the target temperature of the liquid in the first liquid cavity of the heating infusion system, adjusts the temperature of the liquid in the first liquid cavity to the target temperature through a temperature adjusting piece, injects the liquid at the target temperature into a pipeline of the heating module at the flow rate v through a peristaltic pump, and heats the injected liquid through the speed measuring heating lamp tube;
the warming infusion system determines the temperature difference delta t before and after the liquid is heated, and calculates the current heat absorption power p_absorb of the pipeline according to the formula (1);
the warming infusion system establishes a second mapping relation between the calibrated heating power p_heat and the heat absorption power p_absorber;
in the step of calibrating the flow rate, the heating infusion system determines the temperature difference delta T before and after heating the infusion liquid, determines the endothermic power p_absorb according to the second mapping relation, and calculates the flow rate V of the infusion liquid according to a formula (2).
5. The method according to claim 4, wherein the flow rate calibration jig comprises a housing, a temperature adjusting member, a peristaltic pump, a first liquid pipe, a second liquid pipe and a controller, wherein the housing is internally provided with a first liquid cavity and a second liquid cavity, the first liquid cavity is internally provided with liquid, the temperature adjusting member is arranged in the first liquid cavity, the peristaltic pump is fixed on the housing, the first liquid pipe passes through a pump head of the peristaltic pump, one end of the first liquid pipe is connected with the first liquid cavity, the other end of the first liquid pipe is connected with a pipeline inlet of the heating module, one end of the second liquid pipe is connected with the second liquid cavity, the other end of the second liquid pipe is connected with a pipeline outlet of the heating module, and the controller is in signal connection with the heating infusion system, the temperature adjusting member and the peristaltic pump.
6. The method of claim 5, wherein the housing has two quick-fit connectors for the first and second fluid tubes to connect to the first and second fluid chambers, respectively, operating keys and a display for user interaction, and a communication interface for communicating with the warming infusion system, the operating keys, display, and communication interface being in signal connection with the controller.
7. The method of claim 5, wherein the temperature regulating member is a semiconductor cooling plate disposed on an inner wall of the first liquid chamber.
8. The method according to claim 6, wherein the inner wall of the first liquid chamber is covered with a heat insulating material layer at a portion other than the semiconductor cooling sheet.
9. The method of claim 5, wherein the first fluid chamber and the second fluid chamber have equal volumes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311571108.1A CN117607496A (en) | 2023-11-23 | 2023-11-23 | Flow rate calibration method for warming infusion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311571108.1A CN117607496A (en) | 2023-11-23 | 2023-11-23 | Flow rate calibration method for warming infusion system |
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| Publication Number | Publication Date |
|---|---|
| CN117607496A true CN117607496A (en) | 2024-02-27 |
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| CN202311571108.1A Pending CN117607496A (en) | 2023-11-23 | 2023-11-23 | Flow rate calibration method for warming infusion system |
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2023
- 2023-11-23 CN CN202311571108.1A patent/CN117607496A/en active Pending
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