JPH1085323A - Heater for warming dialyzing fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely protect a patient from risks such as electric shock, etc., and not to give a malfunction to highly sensitive response such as a computer controller controlling each element of a dialyzer by forming a structure which does not generate a leak current from a heating resistor flowing electric current therein nor an induced current. SOLUTION: A heat radiating element (electric heater 3) is installed inside of a heat conductive body 2 as making contact each other and a heat resistant and electrically insulating warming pipe 6 is wound on the outer periphery of the heat conductive body 2 to flow supply water or a dialyzing fluid in the warming pipe 6, thereby the heat from the heat radiating element 3 is conducted to the warming pipe 6 and the supply water or dialyzing liquid flowing in the warming pipe 6 is heated under control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dialysate heating heater for adjusting a dialysate supplied to a dialyzer for performing hemodialysis through an permeable membrane to a temperature equal to a patient's body temperature.

[0002]

2. Description of the Related Art In hemodialysis therapy using a permeable membrane, a dialysate supplied to a dialyzer comes into contact with blood derived from a patient's blood vessel via the permeable membrane. Therefore, to adjust the blood returned to the patient's blood vessels to a temperature equal to the patient's body temperature,
It is necessary to adjust the temperature of the dialysate and introduce it into the dialyzer.

[0003] In a dialysis apparatus provided with such a dialyzer, control relating to the amount and pressure of the dialysate, or the composition and temperature of the dialysate, is controlled by electrical control.

Among them, a conventional heater for heating and maintaining the temperature of the dialysate will be described with reference to FIG. 5. Referring to FIG.
A spiral heating resistor 51 formed in a spiral shape is housed therein.
By filling the metal pipe 50 with the powdered or particulate insulating material 52 while applying pressure, it is possible to maintain the spiral shape of the heating resistor 51 in the metal pipe 50 and prevent conductor contact with the metal pipe 50. It is.

The two terminals 53, 53 of the heating resistor 51
Is designed to pass through a sealing plug 54 fixed to the opening of the metal pipe 50 and to be led out.

Further, an outer cylinder 56 is formed on the outer periphery of the metal pipe 50 to form a dialysate flow passage 55 with a gap, and the metal pipe 50 is fixedly held at the upper end of the outer cylinder 56. In addition, an inflow port 57 through which the dialysate flows in is provided at the lower end side of the outer cylinder 56, and an outflow port 58 through which the heated dialysate flows out is provided at the upper end side of the outer cylinder 56.

According to such a heater configuration, the temperature near the outlet 58 of the dialysate is detected and the amount of electric power supplied to the heating resistor 51 is controlled. The heater heat is conducted to the metal pipe 50 via the insulating material 52, and the dialysate flowing around the metal pipe 50 is heated to a predetermined temperature.

[0008]

However, in the above structure, the insulating material 52 in the metal pipe 50 contains a small amount of moisture from the time of its preparation, and the moisture is reduced by heating and cooling the heating resistor 51. By sucking and discharging the air contained,
Since the insulating property of the insulating material 52 is reduced, a leakage current is generated from the heating resistor 51 through which a current flows, or an induced current is generated between the heating resistor 51 and the metal pipe 50, so that high accuracy is achieved. There is a risk of malfunctioning the computer control and the like.

In addition, the above-mentioned insulation breakdown or insulation deterioration of the insulating material 52 causes a risk that the current of the heating resistor 51 is directly conducted to the patient's blood, so that a safe treatment can be guaranteed for a long period of time. A heater was desired.

The present invention has been made in view of the above circumstances, and has a structure in which a leakage current or an induced current of a heating resistor through which a current flows does not occur, thereby completely preventing a danger such as an electric shock to a patient. It is another object of the present invention to provide a dialysis fluid heating heater which does not cause a malfunction in high-sensitivity sensitivity such as computer control for controlling various elements of a dialysis device.

Another object of the present invention is to provide a dialysate heating heater having a structure that does not cause retention of air bubbles.

Further, in consideration of the power supply situation in foreign countries,
An object of the present invention is to provide a dialysate heating heater configured to be able to flexibly cope with a power supply voltage that varies variously depending on regions.

[0013]

In order to achieve the above-mentioned object of the present invention, a dialysate heating heater according to the present invention is provided with a heat radiating element in contact with an inside of a good heat conductor, and a heat radiation element of the heat good conductor. The heat from the heat radiating element is heated by winding a heat-resistant heating pipe of equal length and length having electrical insulation around the outer circumference and supplying water or dialysate through the heating pipe. By supplying heat to the warm pipe, the supply water or dialysate flowing in the warm pipe is heated and adjusted.

A spiral arc groove is formed on the outer periphery of the heat conductor, and the heating pipe is spirally wound in a state of being closely contacted along the arc groove, and a lower end to an upper end of the heating pipe. It is preferable that the supply water or the dialysate is allowed to flow through so that bubbles in the supply water or the dialysate do not stay.

Further, two sets of the heat radiating elements are provided inside the good heat conductor, and the two sets of the heat radiating elements are selectively connected in series or in parallel to correspond to the power supply voltage supplied. Is good.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a dialysate heating heater according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a cross-sectional view taken along line BB of FIG. FIG. 4 is a longitudinal sectional view of the dialysate heating heater according to the second embodiment of the present invention.

(Embodiment 1) In FIG. 1 or FIG. 2, a vertically long cylindrical good heat conductor 2 is formed from an aluminum mold, and an electric heater 3 used as a heat radiating element is cast into the center of the good heat conductor 2. There is. Then, power lines 5 and 5 are connected to both terminals 4 and 4 of the electric heater 3 so as to be drawn out.

A spiral arc groove 2a is formed in the outer periphery of the above-mentioned heat conductor 2. A long heating pipe 6 having the same diameter and being in close contact with the arc groove 2a is made of a heat-resistant resin such as Teflon having electrical insulation properties.
This is spirally contacted and wound along the arc groove 2a,
The lower end of the heating pipe 6 is an inlet 6a, and the upper end is an outlet 6b.
It is drawn out as outside.

Further, the outer circumference of the heating pipe 6 is covered with a cushioning material 7 made of a heat-resistant sponge or vitreous cotton, and the outer circumference is fastened by a protective cover 8 so that the heating pipe 6 can be buffered from the outside. The heat conductive conductor 2 forming a circular groove is tightly attached to the heat conducting surface, or the radiation heat loss to the outside is prevented.

In the dialysis fluid heating heater having such a configuration, the heating pipe 6 is formed so as to flow at a constant speed through a pipe having an equal diameter so as not to cause a stagnant supply water or dialysis fluid flowing therethrough. Therefore, the supply water or dialysate can flow in from the inlet 6a of the heating pipe 6 and flow toward the upper outlet 6b, and the supply water or dialysate spirals from the lower inlet 6a. It does not oppose the rising of the air bubbles and reaches the upper outlet 6b without lowering the dialysis efficiency of the dialyzer connected thereto.

When power is supplied to the electric heater 3 and the electric heater 3 generates heat, the electric heat is transmitted to the heating pipe 6 on the outer periphery of the electric heater 3 through the heat conductor 2 and supplied water or dialysis flowing through the heating pipe 6. Heat the solution.

In the dialysis fluid heating heater having such a configuration, since the electric heater 3 is in perfect contact with the center of the heat conductor 2, heat generated from the electric heater 3 is efficiently transmitted to the heat conductor 2. Good uniform transmission.

Further, in a state where the heating pipe 6 is in close contact with the spiral arc groove 2a formed on the outer periphery of the heating conductor 2, the contact area with the heating conductor 2 is increased, and the heating pipe having a helical shape is formed. 6, the heat conductor 2 and the heating pipe 6 constitute an integral heat transfer body, and the heat generated from the electric heater 3 is transferred to the heating pipe 6. It is possible to efficiently transmit to the supply water or the dialysate inside.

Further, since the heating pipe 6 is formed of a material having an electrical insulation property, the leakage current and the induction current from the electric heater 3 can be completely cut off.
There is no danger of electric shock and no risk of malfunctioning computer control.

Further, the outer circumference of the heating pipe 6 is covered with a cushioning material 7 such as a heat-resistant sponge or vitreous cotton.
Of the heat conductor 2 to the heat conductive surface, or radiation heat loss.

(Embodiment 2) The dialysate heating heater according to Embodiment 2 shown in FIG. 3 or FIG.
Two sets of electric heaters 3 and 3 used as heat radiating elements are cast in the inside, and the other configuration is the same as that of the first embodiment.

In such a configuration, efficient and electrically safe heat conduction to the heating pipe can be performed in the same manner as described above.
By adopting a design corresponding to V to 120 V, it is possible to correspond to a power supply of 100 V to 120 or 200 V to 240 V by selecting whether the two sets are connected in parallel or in series. It is possible to respond locally to changes in voltage due to regional differences.

In this method, products are manufactured with uniform parts, compared with the conventional delivery management and production management, such as preparing a heating heater corresponding to each voltage in a factory for each destination and shipping products. Therefore, the number of parts in stock can be reduced, which greatly contributes to the rationality of production.

In the first and second embodiments, the dialysate temperature is constantly detected downstream of the flow path and the required current is controlled by suppressing and controlling the supplied current. It is possible to adopt a structure in which the influence of the above does not occur.

[0031]

As described above, the dialysate heating heater of the present invention has a heat-resistant heating element having electrical insulation on the outer periphery of a heat conductor in which an electric heater used as a heat radiating element is cast. With the structure in which the supply pipe or the dialysate is circulated in the heating pipe by winding the heating pipe, heat generated from the heat radiating element can be transferred to the heating pipe via the heat conductor, thereby improving the efficiency. This makes it possible to heat the heating pipe with good heat.

Therefore, unlike the prior art, there is no danger that the insulation will be reduced as in the case of the insulating material surrounding the heating resistor through which the current flows directly, so that there is no danger of leakage current or electric shock. While ensuring electrical safety,
It is possible to obtain a heater structure that prevents generation of an induced current and does not cause a malfunction in high-sensitivity sensitivity such as computer control for controlling various elements of the dialysis device.

Further, as the heating pipe which is a dialysate passage, a long pipe having the same diameter and a long electrical insulation which enables a uniform flow rate is used. By directly adhering to the circular groove, the heat transfer efficiency is increased, and the dialysis solution is allowed to flow upward from below, thereby preventing the dialysis efficiency of the dialyzer from lowering as a configuration that does not cause the retention of bubbles. It is possible.

Further, by configuring two sets of heat radiating elements and selecting whether to connect each heat radiating element in parallel or in series, it is possible to prevent a change in power supply voltage due to a regional difference between overseas and local. It is possible to make it compatible, and it is not necessary to manage the delivery date and production such as preparing a heating heater corresponding to each power supply voltage at the factory for each destination and shipping the product, and to commercialize it with uniform parts Therefore, the number of parts in stock can be reduced, which greatly contributes to the rationality of production.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a dialysate heating heater according to Example 1 of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a transverse sectional view taken along the line BB of FIG. 4;

FIG. 4 is a longitudinal sectional view of a dialysate heating heater according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a conventional dialysate heating heater.

[Description of sign]

 2 ... thermal conductor 2a ... arc groove 3 ... electric heater 4 ... terminal of electric heater 5 ... power line 6 ... heating pipe 6a ... inlet 6b ... outlet 7 ... cushioning material 8 ... protective cover

Claims (3)

[Claims] 1. A heat radiating element is provided in a contact state inside a heat conductor, and a heat-resistant heating pipe is wound around an outer periphery of the heat conductor with a uniform diameter and a long heat-resistant heating pipe. By supplying the supply water or the dialysate in the pipe, heat generated from the heat radiation element is transferred to the heating pipe to heat and adjust the supply water or the dialysate flowing in the heating pipe. A dialysate heating heater characterized in that: 2. A spiral arc groove is formed on the outer periphery of the heat conductor, and the heating pipe is spirally wound in a state of being closely contacted along the arc groove, and a lower end to an upper end of the heating pipe. 2. The dialysate heating heater according to claim 1, wherein the supply water or the dialysate is allowed to flow through so that bubbles in the supply water or the dialysate do not stay. 3. Two sets of said heat radiating elements are provided inside said good heat conductor so as to correspond to a power supply voltage supplied by selectively connecting these two sets of heat radiating elements in series or in parallel. The dialysate heating heater according to claim 1, wherein: