CN1246052C - Heating system of intravenous fluid infusion - Google Patents
Heating system of intravenous fluid infusion Download PDFInfo
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- CN1246052C CN1246052C CN 00123777 CN00123777A CN1246052C CN 1246052 C CN1246052 C CN 1246052C CN 00123777 CN00123777 CN 00123777 CN 00123777 A CN00123777 A CN 00123777A CN 1246052 C CN1246052 C CN 1246052C
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- pipe
- band
- fluid
- heat
- joint
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Abstract
The present invention relates to a medical tube for heating venous transfusion fluid before transfusion to patients, which comprises an internal band, wherein a heating component for heating flowing fluid is arranged along the length of the internal band. The inlet and the outlet of the medical tube are respectively provided with a temperature sensor for transferring the temperature of heated fluid and non-heated fluid, and a feedback control circuit is arranged for regulating heat supplied to fluid. In the internal band, current transmission lines give out heat, the heating band heats fluid in the tube, a heating control device is used for regulating current transferred to the current transmission lines. The internal band is thick enough to hold the heating component and the two temperature sensors and is also flexible, so that the medical tube can be used in a conventional mode.
Description
Technical field
The present invention relates generally to armarium, particularly, a kind of venous transfusion fluid heating system, it comprises: at the device of the certain length of tube heat supply in edge before patient's transfusion, the fluid temperature (F.T.) that keeps also control to improve.
Background technology
People's normal body temperature is 37 ℃ (98.6 °F).Drop to 36 degree when following at body temperature, the clinician calls hypothermia to this state.Except the hypothermia degree is a kind of surgical method of having a mind to control, outside the rareness disposal of protecting patient's (as happy dirty and some neural operation), general hypothermia is regarded as disadvantageous, uncontrolled, the unintentional side effect on a kind of medical treatment.But, recover after surgery that hypothermic generation can be up to 60-70% in the ward.Hypothermic outer symptom is to shake and discomfort, and this state can cause other complication.
The postoperative hypothermia is known several factors.The cold patient's loses heat that makes of operating room.The temperature of most of cold surery chamber keeps below normal room temperature, generally keeps 20 ℃ maximum temperature.The patient did not have clothes when another factor was operation.The patient at most only wears gossamery robe in the cold surery chamber of being everlasting, in some cases, patient is mainly exposing in the operation for a long time.Being added to the fluid on the health such as the evaporation of iodine makes the patient further lose heat.The heat exchange of exposing between important organ and the surrounding at the health of operating on is another situation of losing heat.These factors cause the rate hypothermic occurred frequently of patient's postoperative.
A hypothermic major reason is before operation, neutralizes and then carry out venous transfusion to the patient.For example, before use in the blood products of 4 ℃ of cold preservations in ice chest.Resemble other fluid such as saline or glucose and store down, approximately than low 17 ℃ of body temperature in room temperature (20 ℃).When human body injects cold fluid, human body must be the cost acting to sacrifice other function, makes new fluid reach the temperature of people's body running.In doing so, human body temperature drops under the original temperature, and this temperature reduction amount depends on injects fluidic amount and temperature.Inject a large amount of or the very low fluid of temperature can make patient temperature descend the several years, thereby even when not having other factors, also can bring out the hypothermia phenomenon.This phenomenon is not only the old people but also very common in young patient.Therefore, injecting blood and other venous transfusion is the main inducing of the hypothermia problem of postoperative patient.
Put forth effort on the haemoheater of use owing to recognize this problem, medical circle at preheating blood before patient infusion blood always.Yet haemoheater in the past is not the satisfied solution of this problem.At first, though existing haemoheater heating blood before input, blood still is being lower than 37-38 ℃ the temperature input that human body keeps.This is because the heat loss of preheating blood on the pipeline line between from the heater to the input point, and this route gives out heat to the surrounding of lower temperature.If it is rate of flow of fluid is low, just big to the time heat loss that exposes between the input point at heater.
Most of prior art fluid heater is limited in the scope that heating region and input point are separated, and thermal source and venipuncture point are separated the length of an intravenous tube.Fluid temperature on the pipe that does not heat descends, and makes the fluid of heating that a higher original temperature must be arranged.Yet the fluid excessive heat can be destroyed goods in the fluid, and can make this fluid become useless or dangerous in some situation.This temperature drop is violent especially when hanging down flow velocity, and the heat loss that the long holdup time causes in the connection tube behind heater can reach the amount that is before heated.Under high flow velocities, the response time of the heater of prior art heater is an impediment to flow velocity is sharply changed fast reaction and don't makes fluid superheat.
Summary of the invention
In order to compensate in the heat waste of heater in venous transfusion between the patient (the abbreviating IV as) fluid delivery tube, the present invention utilizes a kind of pipe, it comprises: an internal heating band that runs through length of tube, fluid in its heating tube prevents that fluid is lower than normal body temperature and enters the patient.In a preferred embodiment, present invention resides in the temperature far-end and the proximal sensor at pipe starting point and input point place, provide feedback circuit in human body input point place control temperature.By in moving fluidic flow region the heating tape being set, advantage of the present invention is that its heating fluid ratio heating tube outer wall comes more effective evenly.
Following detailed description in conjunction with the accompanying drawings, meeting definite feature of the present invention more than you know, and purpose and advantage.Identical numerical code expression same parts among each figure.
Description of drawings
Fig. 1 is the sketch map of a preferred embodiment of the invention, and the preferred embodiments of the present invention comprise that a gravity impels the device of fluid flow, a heater and has the pipe of the certain-length of internal heating band;
It is preferred that Fig. 2 is that the present invention of device as shown in Figure 1 has pressure actuated mobile second
The sketch map of embodiment;
Fig. 3 is the sketch map of certain length of tube of band heating tape of the present invention, and part dots;
Fig. 4 is the profile of pipe shown in Figure 3;
Fig. 5 is the described pipe of partly cut-away of the present invention and the perspective view of heating tape;
Fig. 6 is the block diagram of the heater controller used in the heater of the present invention; With
Fig. 7 is the block diagram of the secondary heater controller of band dual micro processor.
The specific embodiment
The following explanation that provides can make those of ordinary skills understand and apply the invention with the best mode that the inventor understands.But for those of ordinary skills, multiple scheme is arranged obviously, because in this concrete principle of the present invention that limits, provide a kind of venous transfusion fluid heating system, its internal flow is by band heating in of fluid transferred heat.
Fig. 1 illustrates transfusion system sketch map of the present invention.Venous transfusion support 100 supports a flexible container 102, and it stores blood or brine fluids 104 to patient's input.Infusion liquid 104 supplies to present drip chamber 106, and present drip chamber 106 is compiled fluid before transfusion.The pipe 108 that connects present drip chamber 106 is guided flow control valve 110 into, the flow rate of fluid that flow control valve 110 is regulated to patient's supply.Flexible pipe 112 is connected to joint 114 with flow control valve 110, and joint 114 preferably includes a critesistor or other temperature sensor of measuring the fluid original temperature.Joint 114 connects heating control apparatus 116 by electronic installation, and as shown in the figure, heating control apparatus 116 preferably is installed on the venous transfusion support.Heating control apparatus 116, or is powered by dc-battery by AC-powered when needed via its power line 118.
At fluid when joint 114 flows out, the intubate 122 that it flows to patient's transfusion along pipe 120, or other device.As detailed below, conduct heat continuously to fluid along the length of pipe 120.On intubate 122 or near it, be provided with second heat sensor, measurement is direct in the fluid temperature (F.T.) before the patient infuses, and this Temperature Feedback is arrived heating control apparatus 116.By regulating the heat that transmits along pipe 120, can accurately control fluid temperature (F.T.), with suitable temperature input.Like this, the low inducement of body temperature is lowered or elimination.
Fig. 2 illustrates with respect to second embodiment shown in Figure 1, wherein except that gravity, with pressure control flow velocity input infusion liquid 104.With identical numerical code expression same parts, Fig. 2 comprises that a pressure infusion appliance 124 around venous transfusion flexible container 102 is to flexible container 102 pressurizations.The Pressure gauge 126 that is fixed on the pressure infusion appliance 124 is presented at the pressure that adds on the flexible container 102, can be with the artificial transfusion of hand pump 128 pressurization, or with the motor (not shown) mechanical infusion that pressurizes.
Fig. 3 illustrates the cutaway view of pipe 120, and pipe 120 comprises the device of measuring fluid temperature (F.T.) and heating to fluid.Joint 114 is accepted cold fluid from flow speed controller, and the heat sensor in joint 114 130 is measured the temperature of cold fluid.This first heat sensor 130 is measured fluidic overtemperature, and also can be used for determining the fluidic beginning power supply of heating.Flexibility is with 132 to stretch to the joint 114 from managing 120, connects electric lead 134 on joint 114.As shown in Fig. 1, electric lead 134 stretches out from insulated conduit 136 as the front, stretches to heating control apparatus 116.
Fig. 3 is shown specifically first electrode 142 and second electrode 143, and they are arranged in flexibility with connecting on 132 end opposite and by being embedded in the conductivity cell 144 of flexibility with 132.First electrode 142 and second electrode 143 are determined at flexibility and are with contingent non-continuous event in 132, as fracture, pin hole, failure of insulation and the bubble that forms on tape.The bubble that forms can cause that excessive power is distributed and focus on tape, and the latter can transfer to damage pipe 120.
Figure 4 and 5 illustrate be arranged in the pipe 120 be with 132.Pipe itself can be the conventional type that venous transfusion is used, as 1/8th inches polyvinyl chloride pipes (PVC).With 132 is flexible, preferably push by a kind of heat proof material with the heating element heater 146 that embeds, as shown in the figure, the diameter of cross-over pipe.Pipe 120 and flexibility are with 132 can be squeezed in together in the integrative-structure, or are with pipe and separate formation, subsequently in the insertion tube.When forming together, be with radially cross-over pipe at band and pipe, integrally form merge point with tube wall on the opposite side of pipe.
Band comprises the heating element heater 146 of heat tape 132, the fluid in the continuous then heating tube 120 of line.In addition, heating element heater 146 also can horizontal or vertical zigzag, strengthens heating on the length of pipe.By electric current, distributing of energy heated heating element heater 146 total lengths along the line in heating element heater 146, then heating tape 132.Through being with 132 o'clock, the heat of band is delivered to fluid by conduction and convection current in the fluid Continuous Flow.With 132 lines 150 that also have a signal that transmits heat sensor 130 and 138, line 150 is preferably along the central part setting of band.Band must be thinned to and can make the pipe can be crooked, is enough to anti-leukorrhagia stopping and splits on length of tube but should be fastened to.The general width of band is about 1/10th inches, but is preferably made by PVC or squeeze polymer.
Fig. 6 illustrates first embodiment of the invention feedback control circuit 152 block diagrams.The signal of near-end critesistor is supplied with amplifier 154, and amplifier 154 increases signal intensity, and amplifying signal shows in display device 156.Temperature signal is guided an error amplifier 158 into, and it receives temperature input best or that wish from heater, and compares these two signals.This difference and a known signal as the triangular wave that produces from triangular-wave generator 162, are supplied with a pulse-width modulator (PWM) comparator 160 together then, and the output of comparator 160 supplies to optoisolator 164.Heater transformator 166 of the output of optoisolator 164 control, it is controlled again with the size of current in the heating heating element heater 146 in 132.When the big heat of needs, be adjusted to power of transformer, increase electric current, improve power to the line confession, produce big heat.The heat that increases passes to fluid, and this has improved the downstream temperature on the near-end critesistor.By this way, remain on optimum temperature on the near-end critesistor.
Fig. 7 illustrates second feedback circuit, and it comprises the dual micro processor heating controller.In this circuit, the signal of two near-end critesistor and a far-end critesistor, through simulate-digital converter 168 converts digital signal to, supplies with first microprocessor 170.Signal 172a, the 172b of three critesistor and 172c and conductivity measured value 176 are parallel to simulate-digital converter 174 by second, and the digital signal 178 of generation is guided second microprocessor 180 with first microprocessor 170 UNICOMs into.A display device 182 is connected first microprocessor with input equipment 184, its processing digital signal and displays temperature in display device 182.The digital signal that the first microprocessor 170 and second microprocessor 180 were handled is supplied with optoisolator 186a and 186b separately respectively, and they are with a main triac and an auxilliary triac test signal.With the power supply of test result adjusting heater transformator 188, regulate the electric current in the line and supply with fluidic heat.
Disclosed heating system is light-duty, QA electric heater, compares with using the fluid heater that adds hot jacket, produces the milder temperature characterisitic change curve for fluid flow.The insider is not departing from the multiple variation scheme that will dream up the foregoing description under the scope and spirit of the present invention.For example, do not departing under the scope and spirit of the present invention, the insider can change feedback control circuit.Similarly, when enforcement is of the present invention, also can carry out other change.Therefore, can understand, within the scope of the claims, the present invention can above-mentioned mode in addition implement.
Claims (17)
1. medical pipe that is used to heat intravenous fluid comprises:
One joint is carried the flexible pipe of described injection; With
A band that is positioned at described flexible pipe, described in band comprise at least one and the isolated heating element heater of described flexible pipe, it runs through the length of described flexible pipe, is used for heat is passed to intravenous fluid.
2. medical pipe according to claim 1 is characterized in that, also comprises first temperature sensor in described flexible pipe.
3. medical pipe according to claim 2 is characterized in that, first temperature sensor is positioned at the near-end from the near pipe in afferent veins injection place.
4. medical pipe according to claim 3 is characterized in that, also comprises redundancy second temperature sensor that is positioned at near-end.
5. medical pipe according to claim 3 is characterized in that, also comprises a far-end temperature sensor that is positioned at from the far-end of afferent veins injection place pipe far away.
6. medical pipe according to claim 1 is characterized in that, interior band comprise one along first heating wires on first limit and one along second limit second heating wires and one transmit the three-way of temperature signal.
7. medical pipe according to claim 1, it is characterized in that, comprise that also one is positioned at away from the joint on the pipe far-end at venous transfusion place, described joint comprises that a measurement enters the fluidic temperature sensor of joint, comprise also and the electric connector of described interior band cooperation that band provides adjustable electric current in described.
8. one kind to the fluidic system of patient's vein input controlled ramp, comprising:
The flexible container of a store fluid, fluid is under predetermined transfusion temperature;
A flow speed controller, control is from the flow velocity of flexible container to a flexible pipe;
One first pipe is connecting flow speed controller;
A joint is connecting first pipe, and described joint comprises that an electrical connector and one are connected to a cable on the heating control apparatus with described joint;
A heating control apparatus, accept the temperature signal of joint and according to described Signal Regulation to the electric current of joint; With
One second flexible pipe, comprise a flexibility band in described second flexible pipe, described band and described joint Electricity Federation are logical, and wherein the described electric current of being supplied with to joint by heating control apparatus is transported to this band, it becomes heat with current conversion, and described heat passes to the fluid in described second flexible pipe.
9. system according to claim 8, it is characterized in that, also comprise first temperature sensor that is positioned at the near-end of contiguous described second flexible pipe of infusing, described first temperature sensor provides in described to described joint and is with the signal that transmits, and be sent to described heating control apparatus thus, be used to regulate electric current.
10. system according to claim 9 is characterized in that, also comprises second temperature sensor that is positioned at described pipe far-end, and described second temperature sensor provides signal to described heating control apparatus, regulates electric current.
11. system according to claim 8 is characterized in that, only by the GRAVITY CONTROL fluid flow.
12. system according to claim 8 is characterized in that, partly controls fluid flow by a pump installation.
13. the medical pipe of a venous transfusion, comprise a circumferential wall that limits surfaces externally and internally, described pipe also comprises a band, described band passes inner surface and forms first and second intersection points with the inwall of described pipe along diametric(al), described band and described inner surface and first and second intersection points form one, described band comprises an adjustable heating element heater that separates and stride across the length of described pipe with described inside pipe wall, and described heating element heater can be passed to fluid the described pipe from described band with heat.
14. medical pipe according to claim 13 is characterized in that, also comprise one from the near pipe near-end of transfusion place described with on heat sensor, it for control from the band to pipe fluid heat transferring feedback is provided.
15. medical pipe according to claim 14 is characterized in that, transmits along described band from the signal of described heat sensor.
16. medical pipe according to claim 15 is characterized in that, also comprise one the pipe far-end described with on second heat sensor, second heat sensor for control from the band provide feedback to fluid heat transferring.
17. medical pipe according to claim 14 is characterized in that, also comprises a redundant heat sensor on described near-end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00123777 CN1246052C (en) | 2000-09-06 | 2000-09-06 | Heating system of intravenous fluid infusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00123777 CN1246052C (en) | 2000-09-06 | 2000-09-06 | Heating system of intravenous fluid infusion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1341462A CN1341462A (en) | 2002-03-27 |
| CN1246052C true CN1246052C (en) | 2006-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00123777 Expired - Fee Related CN1246052C (en) | 2000-09-06 | 2000-09-06 | Heating system of intravenous fluid infusion |
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| Country | Link |
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| CN (1) | CN1246052C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2022524B1 (en) * | 2006-05-10 | 2013-04-10 | Genshirou Ogawa | Infusion fluid heating apparatus |
| BR112013026176A2 (en) | 2011-04-12 | 2019-09-24 | Thermedical Inc | devices and methods for remote temperature monitoring in fluid-optimized ablation therapy |
| US10022176B2 (en) * | 2012-08-15 | 2018-07-17 | Thermedical, Inc. | Low profile fluid enhanced ablation therapy devices and methods |
| US9033972B2 (en) | 2013-03-15 | 2015-05-19 | Thermedical, Inc. | Methods and devices for fluid enhanced microwave ablation therapy |
| CN104399160A (en) * | 2014-11-19 | 2015-03-11 | 周西岳 | Medical self-control infusion heater |
| US9743984B1 (en) | 2016-08-11 | 2017-08-29 | Thermedical, Inc. | Devices and methods for delivering fluid to tissue during ablation therapy |
| US11083871B2 (en) | 2018-05-03 | 2021-08-10 | Thermedical, Inc. | Selectively deployable catheter ablation devices |
| US11918277B2 (en) | 2018-07-16 | 2024-03-05 | Thermedical, Inc. | Inferred maximum temperature monitoring for irrigated ablation therapy |
| CN110368313B (en) * | 2019-08-13 | 2022-11-08 | 巨翊医疗科技(苏州)有限公司 | Open type sleeve heating device for infusion hose |
-
2000
- 2000-09-06 CN CN 00123777 patent/CN1246052C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1341462A (en) | 2002-03-27 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SMITH MEDICAL TREATMENT BUILDING CO.,LTD. Free format text: FORMER OWNER: AUXILIARY RESPIRATORY PRODUCTS CO. Effective date: 20070831 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20070831 Address after: Massachusetts USA Patentee after: Smith Medical Construction Co Address before: American California Patentee before: Respiratory Support Products, Inc. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060322 Termination date: 20160906 |
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| CF01 | Termination of patent right due to non-payment of annual fee |