JPH0226511Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a warmer for intravenous fluids, blood transfusions, etc. More specifically, the present invention is a device that overlaps thin plastic films to form a flat transfusion flow path that meander from side to side. The present invention relates to an improvement of an infusion solution warmer that heats an infusion solution by sandwiching a heating bag between heated plates.

[Conventional technology]

So-called infusion fluids, such as blood, nutrient solutions, and Ringer's solution, are normally stored at a temperature of about 4°C. If these infusion fluids are injected into the human body as they are at low temperatures, undesirable situations occur, such as vascular pain and exhaustion of the patient's physical strength. Therefore, the infusion solution is heated to a temperature close to the human body temperature before being injected into the patient.

When this infusion is heated, the heater is constructed by installing a heating plate and a temperature detection sensor on the surface of the box body, housing the heating means and control means for the heating plate inside the box body, and stacking two thin plastic films. A heating bag, which forms a flat infusion flow path that meander from side to side, is formed by a heating plate installed on the surface of the box body and a pressing plate installed on the inside surface of the lid body, which is attached to the surface of the box body so as to be openable and closable. It was meant to be held and warmed.

[Problem that the invention attempts to solve]

These conventional infusion warmers control the amount of heating of the heating plate based on the temperature detected by a temperature sensor, and do not take into account the flow rate of the infusion flowing down the heating bag. However, the rate of infusion into a patient is not constant, and takes into consideration the condition of each disease, such as severity, pulse rate, blood pressure, heart condition, etc. For example, it takes 1 to 3 hours to inject one 500ml vial. determined between 4 and 5, but sometimes between 4 and 5
It may take some time. Therefore, it would be more desirable if the infusion warmer could control not only the temperature of the infusion but also the flow rate of the infusion to control the temperature of the injected infusion. The present invention was made to solve the problems of conventional infusion warmers, and
An object of the present invention is to provide an infusion warmer that can control the heating amount of a heating plate based on the temperature of the infusion and the flow rate of the infusion.

[Means for solving problems]

The measures taken by the present invention to solve the above problems will be explained below with reference to the drawings. In FIG. 1, a heating plate 36 is provided on the surface 12 of the box body 10.
A flow rate measurement sensor 38 is provided adjacent thereto. This flow rate measurement sensor 38 includes a quantitative heating plate 40 and a first temperature sensor 42 provided in the quantitative heating plate 40 surrounded by an insulating part 46.
and a second temperature sensor 44. Further, on the surface 12, a liquid temperature sensor 48 for detecting the temperature of the infusion liquid,
50 is installed. The heating bag 22 attached to the surface 12 of the box body is as shown in Fig. 2, and is a sealed bag made of two thin plastic films stacked on top of each other and glued on all four sides. Shape partitions 24a and 24b are provided alternately to form a flat channel 26 that meanders from side to side, and an inlet pipe 28 and an outlet pipe 30 are bonded to the ends of this channel 26.
After the heating bag 22 is attached to the surface 12 of the box, the lid 52 is closed and the bag is sandwiched between the pressing plates 54 and heated. The heating means and control means for the heating plate are housed in the box, and the configuration of the heating control is as shown in the block diagram of FIG. 3. That is, the detected values of the flow rate sensor 38 and liquid temperature detection sensors 48, 50 are A/D converted and input to the CPU 70. CPU
After a predetermined calculation is performed at 70, a control signal is output to the heater drive circuit 76, and the heating amount of the heater 78 is controlled.

[Effect]

The infusion fluid that has entered the heating bag is heated by the heating plate 36 while flowing down the flow path 26 of the heating bag. The temperature of the infusion is always detected by the liquid temperature sensors 48 and 50, and the flow rate of the infusion is also detected by the flow rate sensor 38. In other words, the cross section of the flow path of the heating bag is constant, and the time for the infusion to reach the second temperature sensor after passing through the first temperature sensor is proportional to the flow rate of the infusion, and the time for the infusion to pass through this time is proportional to the flow rate of the infusion. Since the temperature at which the infusion solution is heated by the metering heating plate should be proportional to the temperature, the larger the temperature difference, the lower the flow rate, and conversely, the smaller the temperature difference, the higher the flow rate. Therefore, the flow rate can be detected based on the temperature difference between the first temperature sensor and the second temperature sensor. These detected values are converted into A/D and input to the CPU 70 as a flow rate signal or a temperature signal. The CPU 70 performs a predetermined calculation and a control signal is output to the heater drive circuit 76, so that the heating of the heating plate 36 is controlled. Therefore, the heating amount of the heating plate is accurately controlled according to the temperature and flow rate of the infusion solution flowing in, so that the infusion solution flowing out from the heating bag 22 can be accurately heated to a desired temperature.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a plan view of a heating bag, and FIG. 3 is a block diagram of an electronic control circuit.

In FIG. 1, the main body 10 is box-shaped, and has a built-in heater and control circuit (not shown) inside, and a switch and a display section on the back side. The surface 12 of the main body 10 is a heating surface, and a rib 14 having a height corresponding to the thickness of the infusion channel 26 of the heating bag 22 is provided on the outer peripheral edge of this surface 12, so that the heating bag 22 can be accommodated. A space is formed. On one side of the rib 14 is the inlet pipe 2 of the heating bag.
8 is fitted into the inlet pipe groove 16 and the outlet pipe 30 is fitted therein. An outlet pipe groove 18 is provided. Two cylindrical heating bag attachment protrusions 20 are attached to the short side of the surface 12 of the main body.

The heating bag 22 is as shown in FIG. 2, and is made by overlapping two thin plastic films and gluing the four circumferences to form a sealed bag, with comb-like partitions 24a and 24b alternated from the left and right sides. A flat infusion channel 26 is formed by meandering from side to side, and an inlet pipe 28 is installed at the inlet end of this channel 26.
An outlet pipe 30 is glued to the outlet end.
A mounting piece 32 is provided on the short side of the heating bag 22, and two mounting holes 34 are formed in the mounting piece 32. The heating bag 22 has its mounting hole 34 fitted into the heating bag mounting protrusion 20 on the main body surface 12, and the inlet pipe 28 is inserted into the inlet pipe groove 16 provided in the rib 14.
The outlet pipe 30 is fitted into the outlet pipe groove 18 and attached to the surface 12 of the main body.

A heating plate 36 is provided on the surface of the main body that the infusion flow path 26 comes into contact with when the heating bag 22 is attached. An infusion flow rate sensor 38 is provided at a portion of the heating plate 36 corresponding to the inflow side of the infusion flow path 26. The flow rate sensor 38 has a width that covers the entire width of the infusion flow path 26 and consists of a heating plate 40 that is always heated at a constant temperature and two temperature sensors 42 and 44 provided within the heating plate 40. The temperature sensors 42 and 44 are provided surrounded by a heat insulating section 46 with a certain distance between them. A first liquid temperature sensor 48 is disposed between the inlet pipe groove 16 and the flow rate sensor 38, and a second liquid temperature sensor 5 is disposed between the heating plate 36 and the outlet pipe groove 18.
0 is provided for each.

The lid 52 is attached to one side of the surface 12 of the main body with a hinge so that it can be opened and closed, and a pressing plate 54 is elastically attached to the inner surface of the lid 52. When the lid 52 is closed, the pressing plate 54 has a rib. Heating bag 2 attached to the surface 12 of the main body at the same time as being pressed against 14
You can sandwich 2. The lid 52 also has an inlet pipe 2 for a heating bag attached to the surface 12 of the main body when the lid 52 is closed.
Notches 56 and 58 are provided where the 8 and outlet pipe 30 contact, and when the lid is closed, the notches 5
6, 58, the inlet pipe 28 and the outlet pipe 30 are inserted.

An example of how the warmer is used is shown in Figure 4.
The drip tube 64 is passed from the vial 60 through the tube needle 62.
The flow rate of the infusion fluid introduced is adjusted by a flow rate adjustment device 66, connected to the inlet pipe 28 by a liquid feed pipe 68, and flows into the heating bag 22 attached to the main body 10 of the warmer.

The infusion fluid that has flowed into the heating bag 22 is heated by being sandwiched by a heating plate 36 attached to the main body surface 12 while flowing down the flow path 26 while meandering. The heating plate is controlled by an electronic control circuit housed within the box, and the configuration of the control circuit is as shown in the block diagram of FIG. In FIG. 3, the temperatures detected by the first liquid temperature sensor 48 and the second liquid temperature sensor 50 are respectively A/D converted and input to the CPU 70.

On the other hand, if the temperature difference is large, the flow rate of the infusion flowing over the flow rate sensor 38 is small, and conversely, if the temperature difference is small, the flow rate is large, so it is detected as a temperature difference between the two temperature detection sensors 42 and 44. Similarly, the signal is A/D converted and input to the CPU 70. A read-only memory ROM 72 in which a control program is stored and a readable and rewritable memory RAM 74 in which various data are stored are connected to the CPU 70, and predetermined calculations are performed based on the three temperature signals to control the heating section drive circuit. 7
A control signal is sent to 6. A heater 78 of the heating plate 36 is connected to the heating unit drive circuit 76, and heating is controlled.

The infusion solution, which has been sufficiently heated in the heating bag 22 and whose temperature is controlled to a predetermined temperature, is passed through the outlet pipe 30 to vent air 8.
After the air enters the system and the air is separated, it is injected into the human body through an octopus tube 82 and an intravenous needle.

In this embodiment, liquid temperature sensors are provided on the side where the infusion fluid flows in and the side where the heated infusion fluid flows out, so that the amount of heating is controlled in accordance with the temperature of the infusion fluid flowing in, and the heated infusion fluid is heated. Since the amount of heating is corrected based on the temperature, extremely accurate temperature control is possible. Note that the present invention is not limited to this embodiment; for example, as shown in FIG. It can also be used as a liquid temperature sensor. By doing so, the structure of the warmer can be simplified and the product cost can be reduced.

[Effect of idea]

As explained above, the infusion warmer of the present invention is equipped with a temperature sensor for the infusion to be heated as well as a flow rate sensor for measuring the flow rate of the infusion to control the amount of heat from the heating plate. In addition, since it is possible to follow and control changes in flow rate, it is possible to extremely accurately heat the infusion solution to a desired temperature.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a plan view of the heating bag, Figure 3 is a block diagram of the electronic control circuit, Figure 4 is a side view showing the infusion warmer in use, and Figure 5 is a heating surface showing another embodiment. FIG. DESCRIPTION OF SYMBOLS 10...Box body, 12...Surface, 22...Heating bag, 26...Flow path, 36...Heating plate, 38...Flow rate sensor, 48...First liquid temperature sensor, 50...
Second liquid temperature sensor.

Claims (1)

[Scope of utility model registration request] A heating bag made of two thin plastic films stacked together to form a flat flow path that snakes left and right is attached to a heating plate installed on the surface of the box and to the inner surface of a lid that is attached to the surface of the box so that it can be opened and closed. In an infusion warmer that is heated by being sandwiched between a pressure plate and a pressure plate provided, a temperature detection means for detecting the temperature at the outflow end of the flow path of the sandwiched heating bag, and a temperature detection means for detecting the temperature at the outflow end of the flow path of the sandwiched heating bag, and a a quantitative heating plate that heats with a heating amount of , a first temperature sensor provided at one end of the quantitative heating plate surrounded by a thermal insulation part, and a first temperature sensor provided surrounded by a thermal insulation part at the other end of the quantitative heating plate. and a control means for controlling the heating of the heating means based on the flow rate measured by the flow rate measuring means and the temperature detected by the temperature detecting means. An infusion warmer characterized by: