JPS62253076A - Blood preheating apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Industrial Field of Application The present invention relates to a blood preheating device, in particular an infusion/transfusion solution preheating device with a heating device that acts during the transport of infusion/transfusion blood. This heating device heats a heat exchanger that has a groove on the outside that contains the tube through which the infusion/transfusion blood flows.

PRIOR ART A device of this type is described in European patent application No. 85-11073.
This is known from No. 7.5.

The device described therein is used for the accurate and reliable heating of blood infusions/transfusions, in which the temperature of any solution is brought to a given temperature during the flow to the syringe. It is stated that the feature is that heating is guaranteed while controlling the amount of heat. The device used does not require specially designed tubing or other equipment for heating the infusion/transfusion blood. For example, a tube leading from a white liquor reservoir to a syringe is wound helically in a thin winding formed in the form of a groove around a heatable cylinder/sheath. The spout warms the blood used in this example to a temperature suitable for the desired injection. Furthermore, a method is described for guiding and supporting the tube at the beginning and end of the heating cylinder so that the tube can contact the side of the cylinder in a stable orientation.

In practice, essentially, a normal injection device is about 1.90
A tube with a length of m is used, and in the case of %
Tubes with lengths from m to 3.50 a are used. Longer tubes are needed in emergencies because large amounts of fluid need to be rapidly injected or transfused. Raising a body-friendly temperature from a low storage temperature to a large amount requires a longer heating path. because,
This is because the flow rate is inherently higher than in the normal case. For physiological reasons, the temperature of the heat exchange cylinder cannot be increased arbitrarily at high flow rates. This is because if the temperature is too high, chemical changes in the solution and coagulation of stored blood may occur. For a given temperature of the heat exchange cylinder, the high heat transfer required at high flow rates can therefore only be achieved by increasing the length of the tubes or grooves.

In the device described in European Patent Application No. 85-110737.5, only one groove is threaded for the insertion of the tube. If the grooves are designed for normal use, they cannot be used in emergencies. Because in that case the heat exchange surface of the groove is not sufficient for large flow rates. On the other hand, if the length of the groove were to be longer for emergencies, the tube would have to be pulled out of the groove at a certain point during normal use. However, this is inconvenient because there is no way to prevent bending. Early withdrawal of the tube is generally not possible, such as when the tube and the heat exchange cylinder are thermally insulated by a tightly fitted sleeve. Other devices are known in which the injection/transfusion takes place through a snap-in pocket arranged between two hot plates (DE-O32802993, DE-O32802993,
-O83023416, DE-O31954019, European Patent Application 0012123). A disadvantage of this device is that a continuous syringe cannot be used. Furthermore, the blood flows through a specially designed inset pocket which, due to its construction, has a high flow resistance, so that in some cases there is the disadvantage that the remainder of the stored blood no longer passes through the inset pocket.

This device has a high pressure loss, making it impossible to inject a large amount of liquid per unit time.

Furthermore, it is known to heat the transfused blood in an exothermic chemical reaction within the device (DE-O 3251588).
9). In this case too, the use of a continuous syringe is not possible. Moreover, controlling exothermic chemical reactions is very expensive.

Furthermore, devices are known in which the infused blood is passed through a water bath. This kind of equipment (TLS-PS3G29552
), a tube with 20 or more turns is helically wrapped onto a braid made of two U-frame members and immersed together with it into a steel container. and,
It contains a continuously heated liquid.

In another equipment (υ5-ps3G143851), an electric heating device is placed at the bottom of a convection tube similar to a chimney tube. This creates convection inside the tank. Outside the chimney-like convection tube, there is also a spiral-shaped There is a coiled tube through which the blood to be injected/transfused passes.This system is also extremely crude and impossible to use with a continuous injector.

The problem that the invention seeks to solve Accordingly, the invention is based on the problem of forming a device of the type mentioned in the introduction as follows.

This means that the injected or transfused blood can be precisely warmed to a predetermined temperature even at a number of different flow rates, without stagnation or overheating in different locations, and with satisfactory heating. To further improve the heat transfer to the injected/transfused blood so that it is possible to further increase the flow rate at the same time as guaranteed.

The oral problem is solved according to the invention as follows. That is, at least one boundary wall between the beginning and the end of the groove is provided with a break at least the width of the inner diameter of the groove.

The device according to the invention therefore allows tubes of different lengths to be attached to the heat exchange surface, so that different flow rates of solution can be applied, even though the heating temperature of the heat exchange surface is fixed. It has the essential advantage of being able to be heated to the same given temperature. Depending on the length of the tube, the channel through which the solution flows has breaks at different distances, and the tube can be pulled out of the channel through these breaks as required. By mouth treatment, the tube can be heated to the same temperature in different lengths depending on the flow rate of the solution. This means that, for example, a solution at 2 degrees Celsius can be rapidly and safely heated in a body, regardless of the flow rate, without local overheating changing the chemical composition of the solution or affecting its viscosity. to ensure that it is heated to the correct temperature.

According to the invention, the heat exchange cylinder is provided with a thermally insulating cover. This covering, which presses the tube lightly against the grooved surface of the heat exchange cylinder, improves the heat transfer between the tube and the heat exchange cylinder, while avoiding radiation of thermal energy.

Furthermore, according to the invention, a groove is formed on the outer surface of the heat exchange cylinder, and the groove is spirally wound.

This has the advantage that by varying the pitch angle of the grooves on the side surfaces of the height-limited cylinder, the number of windings and thus the usable heating surface can be varied particularly easily. Even if there are many windings, the tube can be easily inserted into the groove or pulled out by simply winding or unwinding. Expanding the heating surface does not change the geometric dimensions of the device;
The compact construction method for building the device is also preserved.

An embodiment is also advantageous in which a further groove can be driven diagonally through the valley groove at least once.

This occurs when there are many turns on the side of the heat exchange cylinder.
The tube has the advantage that it does not have to pass through all turns. Depending on the purpose of the application, while keeping the heating temperature of the heat exchange cylinder constant, different thermal shocks can be provided to the solution flowing in the tube. Therefore,
One and the same device can be used to set a constant target temperature for different flow rates of solutions.

For example, suppose there are 10 spiral turns on the side surface of a heat exchange cylinder, and a groove is provided diagonally to the remaining 5 turns. Then, the tube can only be pulled out from the heat exchange cylinder after it has been wound five times. When the heating temperature of the cylinder is constant and a predetermined flow rate of liquid is passed through the tube, if the liquid is not sufficiently warmed at the outlet from the heat exchange cylinder, pass the tube through the groove of the sixth turn to prevent its erosion. It can be pulled out through a diagonal groove. If this is not sufficient, up to the 10th turn could be used to heat the solution passing through the tube to the desired target temperature. The diagonal grooves can also be arranged so that the tube can be pulled out of the heat exchanger after every half turn.

A further development of the invention provides that the groove and the diagonal groove begin or end in common. This has the further advantage that the tubes passed through the grooves will have the same inlet and outlet on the heat exchange cylinder, even if the number of turns is different. Additionally, inlet or outlet retainers are provided at the beginning/end/break of the groove. These retainers facilitate the enclosing of the tubes into the grooves of the heat exchange cylinder, while stabilizing the orientation of the tubes outside the heat exchange cylinder.

In a further embodiment of the invention, the inlet or outlet retainer is an inwardly flared notch running across the groove and opening arcuately at the end. This has the advantage that the tube passed through the widened notch can be easily bent forward or sideways without breaking.

The problem is solved in another way, namely by adding a certain amount of heat to the tube between the inlet to the groove and the outlet in order to improve the heat transfer coefficient of the heat exchange cylinder for the infusion/transfusion blood flowing in the tube. This means that the wall thickness over the length of the area is thinner than that of the rest of the area.

An alternative improvement to the device described in the introduction for solving the same problem is as follows. That is, in order to improve the heat transfer coefficient of the heat exchange cylinder for the infusion/transfusion blood flowing within the tube, the wall thickness of the tube is reduced over a certain length between the entrance to the groove and the outlet. To make the metal thinner than the parts, or to tighten the metal.

This embodiment has the following advantages: injection/
Given the predetermined heating capacity of the device for transfused blood, the flow rate of the solution to be heated can be increased by improving the heat transfer between the tube and the heat exchange cylinder. In addition to reducing the wall thickness of the tube in the heat exchange cylinder area, this also requires choosing a material with particularly high thermal conductivity as the material of the injection tube, for example silicone, or adding gold powder to the synthetic resin material. This is achieved by adding.

<Structure of the Invention> Means for solving the problem and its operation, that is, the preheating device according to the present invention is a preheating device that warms and preheats blood. It is characterized by comprising a heat exchange device in which a groove is formed for receiving a tube through which blood or transfused blood flows, and a cutout that penetrates through at least one boundary wall at the beginning and end of the groove. shall be.

Therefore, the configuration of these means and their functions will be explained in detail with reference to the drawings.

In addition, FIG. 1 is a front view showing a part of the preheating device according to the present invention in cross section, and FIG. 2 is a II--FIG.
3 is a top plan view of the apparatus shown in FIG. 1, FIG. 4 is an enlarged front view of one example of the heat exchange device, and FIG. 6 is a plan view of an enlarged cut of the inlet holder, and FIG. 6 is a circuit diagram of an example of the heating control device a implemented in the device of the present invention, and FIGS. 1, 8, and 9 are 10 is a longitudinal sectional view of each embodiment of an improved infusion tube, and FIG. 11 is a graph showing the relationship between blood temperature and flow rate at the outlet of the device of the invention.

First, as shown in FIGS. 1, 2, and 3, a container cover 2 is screwed onto a container 1 of a preheating device according to one embodiment of the present invention. A heat exchange cylinder 3 is held between the container 1 and the container cover 2. The mouth is heated by thermal resistors 4 placed along the inside of the periphery. Runs in a spiral along the outer circumference of the heat exchange cylinder 3! It has lI5. In it is placed a tube 6, which is a component of a commercially available syringe. This is, for example, a connection between a blood reservoir and a syringe. In order to seat the tube 6 in the groove 5 and guide it immovably, there is an inlet holder 7 at the beginning of the groove 5 and an outlet holder 8 at the end of the groove 5.

These holders hold the tube 6 in such a way that the tube 6 has an opening for inserting into and withdrawing from the holder 7.8 without any particular force application.

In addition to the groove 5, a further cutout 5' runs obliquely to the groove 5 on the outer surface of the heat exchange cylinder 3.

In the figure, as an example, the height of four turns is crossed.

A diagonally running cutout 5' passes through at least one boundary wall of the groove 5 and extends in the direction of the beginning of the groove 5.

In other embodiments, the oblique cutout 5' can run towards the end of the groove 5 or run at any point on the outer surface of the heat exchange cylinder 3 diagonally to the groove 5 with a suitable inclination. It's self-evident.

The diagonal notch 5' guides the tube 6 over the helical groove 5, skipping the previous turn, and into the slot C of the inlet holder. As shown in FIG. 1, the diagonal notch 5' extends over a number of coiled grooves 5, so that the tube 6 can be
It can be pulled out from the heat exchange cylinder 3 after a certain number of turns.

The heat exchange cylinder 3 is made of aluminum and has an outer diameter of 1, for example.
Can be made to 3cm and height 4C1. In order to ensure and improve the heat transfer into the groove 5, the tube 6 is held in a sliding manner with a certain clamping effect. In the example, the depth of the groove 5 is 3.5 mm.
8@, the bottom has a radius of 1.8 m, and the tube 6 is in contact with as large a surface as possible for heat transfer.

The tube 6 typically has a radius of 2IIIm and therefore an outer diameter of 4mm. The tube therefore protrudes slightly above the heat exchange cylinder 3. The grooves 5 are slightly laterally cut in order to enhance the tightening effect, that is, the opening of the grooves 5 has a width between 3.7 and 3.8 cylinders on the surface of the heat exchange cylinder 3, On the other hand, the maximum inner diameter of the groove 5 is 4 mm.

To prevent heat radiation and increase heat transfer, the heat exchange cylinder 3 containing the tubes 6 is surrounded by a cover 9. Groove 5 or 5'
11. Cover with a tube. ) 9 is mounted on the outside of the heat exchange cylinder 3. This presses the tube 6 with a force within the groove 5 and the notch 5' of the same depth.

The cover 9 is flexible and is preferably made of textile material or a comparable synthetic resin structure. The inside of the cover 9 is coated with an aluminum foil 10 having accordion-like pleats.

This serves to prevent heat radiation to the outside and, moreover, to effect heat transfer from the heat exchange cylinder 3 to those parts of the tube G that are not directly in contact with the surface of the grooves 5.5'.

This is, in other words, the part of the tube 6 that protrudes above the surface of the heat exchange cylinder 3.

The aluminum foil 10 is applied directly to the surface of the heat exchange cylinder 3 when the cover 9 is closed (in this way, the tube 6 is completely uniformly defined on all sides along the section where it passes through the groove 5 or 5'). temperature is guaranteed.

Furthermore, cover 9 is filled with burdock.
-5 chlus N1 to ensure that the tube 6 is pressed against the groove 5 or 5' with a certain force when the cover 9 is closed.

A temperature sensor 12 is arranged in each thermal resistor 4. Temperature sensor 12 determines the input measurement to the heating control system.

Furthermore, a mercury thermometer 13 is arranged on the inner periphery of the heat exchange cylinder 3, and when a certain fixed temperature is reached, the mercury thermometer 13
Establish contact between two contacts. This serves to ensure that the device according to the invention is switched off when a predetermined temperature is exceeded. For the purpose of checking this function, a heater, which can be operated separately from the outside, is installed inside the heat exchange cylinder at the foot of which the mercury thermometer 13 is fixed. If this is activated, for example through a test button, the heating control will be switched off and a fault will be signaled.

In the upper area of the container 1 there are plates 20 and 21 with components of the electrical circuit. The connection to the power supply for the electrical circuit is shown at 22. Handle 23 on container cover 2
, which belongs to lifting equipment with transformers and voltage circuits. By means of this lifting device, the entire device is placed on a pedestal next to the patient bed or fixed next to the stretcher in a patient transport vehicle. There is a handle 24 on the top of the device. Additionally, on the top side of the device there is a digital temperature display 27, a control light 28 for the thermal resistor and two combined start and interrupt keys 29.
There is an operation and display panel 25 with and 30.

FIG. 4 shows a heat exchange cylinder 3 as a component inserted between the container 1 and the container cover 2. As shown in FIG. The outer surface of the heat exchange cylinder 3 has a spiral groove 5 and a diagonal notch 5.
' is placed.

The inner diameter of the groove 5.5' is dimensioned to the diameter of the tube 6 passing through it. The grooves 5, 5' surround the tube 6 in such a way that there is as large a heat transfer surface as possible between the wall of the tube and the inner surface of the groove 5.5'. On the other hand, the tube 6 is shaped so that it can be easily inserted into and removed from the groove 5.5'.

In FIG. 5, the tube 6 is threaded through the inlet holder 7, which is shown as an enlarged cut. The tube G is held down with a certain force into the groove extending inside the inlet holder 7, or is pulled in obliquely coming from below or above. The tail-shaped groove of the inlet holder 7 guides the tube 6 into the heat exchange cylinder 3 while keeping the direction stable. Entrance holder 7
The inwardly widening groove runs at right angles to the helically running groove 5 and is fixed to the container 1 or formed integrally therewith. The ends of the inlet retainer 7 flare out in an arcuate manner. The outlet holder 8 is
It is formed similarly to the inlet holder 7 and lies on the container cover 2 opposite the inlet holder 7.

FIG. 6 shows a circuit diagram for two heating devices each consisting of one thermal resistor.

The heating device 1140 consists of a thermal resistor 4 (e.g. 22
Ohm). This heating device 40 has one control.
A switch 41 and one safety switch 42 are attached.

The heater @ 40, the control switch 41 and the safety switch 42 together form one first heating control device 50. Furthermore, a second heating control device -@50' is provided. This one is made exactly the same.

The thermal resistors 4 of the two heating control devices 50, 50' are uniformly distributed along the inner surface of the heat exchange cylinder 3. They are tuned in size and operating point to provide the required overall heating performance. They are kept at a constant temperature (
For example, they are controlled independently from each other to maintain a uniform temperature (for example, 27 degrees Celsius). The present invention provides two independent heating control devices @50.50' set at a constant temperature, so that if one of them malfunctions and the temperature becomes too high, the other will heat less accordingly. The safety of the equipment is ensured.

The mode of operation of the heating control device 50, 50' is as follows. Temperature sensor 12 is formed by one NTC resistor. This type of resistor has the characteristic that its resistance decreases as the temperature rises and increases as the temperature falls.1NTc=
Negative lagoon system WJ). Temperature sensor 12 also forms a second branch of the measuring bridge by means of one resistor R7.

The center tap connects to the positive inputs of amplifiers 43 and 44. The second branch of the measuring bridge is formed by resistors R2, R3 and R4. The tap to resistor R3 can now be adjusted for temperature setting. The output of amplifier 43 is connected through resistor RS to the base of a Darlington circuit 45 consisting of two transistors. Voltage amplification is practically limitless. Therefore, even a very small input value results in a standardized output value. As soon as the bridge voltage is greater than zero (temperature is lower than a pre-given reference humidity), heating 40 is turned on and a heating current flows through thermal resistor 4 . The power supply to the measuring bridge is smoothed and stabilized by a combination of a diode 48, a capacitance 49 and a voltage regulator 51 through a line 46 from the output of the rectifier circuit 47.

The center tap of the first branch of the measurement bridge formed by R1 and temperature sensor 12 also leads to the positive input of amplifier 44. The negative input of amplifier 44 leads to an adjustable fixed point of another branch of the second bridge circuit. The differential voltage of this bridge circuit reaches the amplifier 44 and the base of the amplifier formed by a further resistor, one transistor. The driver is in the relay 52 circuit.

Then, when the temperature acting on the temperature sensor 12 reaches a preset value, the generated voltage decreases. Amplifier 44 goes to zero. The make contact 52' opens, causing the current in the transistor connected to the output of the amplifier 44 to be removed and the current in the relay 52 to be removed with it.

This cuts off the power supply to the entire heater. This condition is only cleared by activation of switches 53 and 54. For starting, the switches 53, 54 of the heating control device [50, 50' must be activated. Then, a current is generated in wire 4G and the device begins to operate.

Furthermore, one safety circuit is ensured by the mercury thermometer 13. When a pre-given settable temperature is exceeded, contact occurs and relay 55 is pulled.

Positioning contact 55' opens. Heating control device [50,50'
The power supply is cut off.

This rise in the temperature of the transfused blood beyond a certain set value poses significant danger to the patient, and it is therefore a primary objective of the present invention to avoid this with absolute certainty. given importance. The following systems work together independently of each other.

a) One of the two mutually independent heating control devices 50.50' may e.g.
If there is a linear movement of 2 or 1, the other side will respond and maintain balance. That is, two heating control devices controlled independently of each other! 50.50' acts complementary to temperature changes.

b)! Each heating control device 50, 50' has a safety switch 42 which acts to cut off the entire voltage supply when a certain set temperature value is exceeded.

C) In addition, as another independent safety measure, a mercury thermometer 1
There is a safety switch consisting of 3 and relay 55. this is,
When the temperature of the heat exchange cylinder 3 exceeds a certain value, the voltage supply is also cut off.

1 to 10, the embodiment of the tube 6 is shown in the groove 5.5'.
The region between the inlet area and the outlet position from the grooves 5, 5', ie between the inlet holder 7 and the outlet holder 8, is shown.

According to FIGS. 1 to 9, the tube 6 is thinner in this area than in the adjacent tube area. 7th
In the illustrated embodiment, the tube 6 has an inner section 10G and two sections 107' and 107- stretched over it.
formed from. Tube portions 107' and 107-
In between, there is a section of length corresponding to the length of the groove and recess 5.5' of the heat exchange cylinder 3 of FIGS. 1 and 4. And, the part consisting only of this inner tube part 1013 is exactly the groove 5.5 of the heat exchange cylinder 3.
’. For this reason, the wall thickness of this part is reduced compared to the rest of the tube 6. The heat transfer is correspondingly better, but the strength is therefore reduced because the tube 6 has grooves 5.5' in the mouth area.
It is compensated by being securely held inside and protected against external damage.

In this way, the desired heating of the injection liquid can be achieved even at high flow rates. The material of the tube shown in FIG. 7 can be transparent PvC or silicone. The wall thickness of the tube sections 106, 107', 107- is 0.25 nm
It is.

8 and 9 again show a tube 6 having a reduced wall thickness along its length. The difference with the embodiment of FIG. 1 is that during manufacture the tube 6 is stretched more strongly in the region where it enters the groove 5.5', i.e. it is originally formed with a thinner wall thickness, while the outer parts 108', 108 '' in that it is formed with full wall thickness.

A further embodiment of the tube 6, represented in FIG. 10, has the same wall thickness but an increased thermal conductivity compared to known injection tubes. High thermal conductivity
Metal powder is mixed into the material of the tube 6 which has the same overall wall thickness of 0.5 mm (for example, metal particle embedding 1
09)). This can be, for example, aluminum particles. Therefore, between the inlet holder 7 and the outlet holder 8 the groove 5.5' of the heat exchange cylinder 3
41i the area of tube 6 that goes inside! This is the colored, opaque material that I learned about. Of course, the metal powder may be mixed over the entire length of the tube 6.

FIG. 11 expresses the relationship between the temperature of the solution at the outlet of the device and the flow rate of the solution. Functions a and b describe the temperature course of the device according to the invention. In contrast, the temperature-related fraction C of the device described in European Patent Application No. 85-110737.5 is shown. Water was used as the injection fluid in the model. The numerical numbers a and b are
The temperature profile of a liquid entering the device according to the invention at 15° C. (function a) and 8° C. (function b) is shown, respectively. Here, the entire turn of the emergency syringe according to the embodiment of FIG. 1 is used.

In contrast, the numerical value C shows the temperature profile for the device described in European Patent Application No. 85-110737.5 with three turns. The inflow temperature of water is 11
The temperature is 5°C. According to this, for example, the device of European patent ratio 11.95-110737.5 has a flow rate of 200
The outlet temperature at 0ml/h is 29°C. On the other hand, in the device of the present invention, the flow rate is 3100 ml/h (inlet temperature 8° C.) or 3800 r*t t'M inlet temperature 15
℃), the same outlet temperature is guaranteed.

Embodiment A preferred embodiment of the preheating device having the above configuration will be further described as follows.

(1) A heat insulating cover 9 is attached to the heat exchanger.

(2) There is a groove 5 on the outer surface of the heat exchange cylinder 3, and the groove 5 runs in a spiral manner.

(3) At least one notch 5' crosses the groove 5 diagonally at least once.

(4) A notch 5' is formed at the beginning and end of the groove 5 I'.

(5) An inlet or outlet holder 7.8 is provided at the beginning, end, or break of the groove 5.

(61) In the inlet holder 7 or the outlet holder 8 there is an inwardly widening groove that runs perpendicular to the groove 5 and opens arcuately at its end.

(7) between the inlet and the outlet to the groove 5, in order to improve the heat transfer of the heat exchanger to the blood flowing in the tube 6;
Over a certain length, the wall thickness of the tube 6 is made thinner than in the rest of the length.

(8) The tube 6 is 0.2 mm to 0 in its partial area.
．． It has a reduced wall thickness of 3 mm.

(9) In order to improve heat transfer, metal powder is embedded 109 in the tube 6 over a certain length between the entrance and exit of the groove 5.

<Effects of the Invention> As explained in detail above, in the preheating device according to the present invention, a groove 5 is formed on the outer surface of one heat exchanger, and a tube 6 is inserted into this groove 5, so that blood transfusion and At the time of injection, the blood within the tube 6 is preheated to an appropriate temperature.

Furthermore, at least one boundary wall at the beginning and end of the groove 5 is torn to form a notch, the size of which is at least comparable to the inner diameter of the groove 5. The break in the groove 5 is such that the tube 6 passed through the groove 5 has the same wall thickness over its entire length or has a reduced wall thickness in the area of the heat exchange cylinder 3 after a certain groove length. This allows it to be pulled out from the groove 5.

This is so that different lengths of tubing can be used depending on the need for heating at different flow rates during normal and emergency situations. A removable thermally insulating cover 9 protects the tube 6 in the groove 5, prevents heat radiation to the surroundings and improves heat transfer between the heat exchanger and the tube 6.

[Brief explanation of drawings]

FIG. 1 is a front view showing a part of the preheating device according to the present invention in cross section, FIG. 2 is a sectional view taken along the II-II ridge line of the device shown in FIG. 1, and FIG. 3 is a cross-sectional view of the device shown in FIG. 1. Plan view from above;
Figure 4 is an enlarged front view of one example of a heat exchanger;
The figure is a plan view of an enlarged cut of the inlet holder, and FIG. 6 is a circuit diagram of an example of a heating control device implemented in the device of the present invention.
7, 8, 9 and 10 are longitudinal sectional views of various embodiments of the improved infusion tube, and FIG. 11 shows the relationship between blood temperature and flow rate at the outlet of the device of the invention. This is a graph showing. Code 1... Container 2... Container cover 3... Heat exchange cylinder 5... Groove 5'... Notch 6... ...Tube) 4-II Fig, 3 Fig, 4 Fig, 11 days 9.6

Claims (1)

[Claims] A preheating device for warming and preheating blood, in the transport of injected/transfused blood, comprises a heat exchange device having a groove formed on its outer surface for receiving a tube through which the injected blood or transfused blood flows, and the beginning of this groove. Blood preheating device characterized in that it is provided with a notch which penetrates at least one boundary wall at the end.