JPS6326850B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a temperature measuring probe. More specifically, the present invention relates to a medical temperature measurement probe for measuring the temperature of extracorporeally circulating blood flowing through a blood circuit of an artificial kidney, a heating blood circuit for cancerous tumor treatment, and the like.

<Conventional technology and its problems> In artificial kidney dialysis treatment and treatment of cancerous tumors, so-called extracorporeal blood circulation, in which a patient's blood is circulated outside the body via a blood circuit, is widely used. When performing extracorporeal blood circulation such as
For example, in the case of a blood circuit for an artificial kidney, it is necessary to accurately maintain the temperature of the blood returned to the patient at body temperature, and in the case of a heated blood circuit for cancer treatment, it is necessary to maintain the temperature of blood returned to the patient at the same temperature as possible without causing hemolysis. Accurate temperature measurements are required because the extracorporeal circulating blood temperature must be maintained within the effective temperature range, ie 40-42°C. Furthermore, the temperature measuring means must not cause any adverse effects such as contamination on blood.

The currently commonly used temperature measurement means is to insert a glass rod-shaped thermometer into a drip chamber placed in the blood circuit and read the indicated temperature. This method has the disadvantage that the thermometer has a large heat capacity, so it takes time to indicate the temperature, and therefore the response to temperature changes in the extracorporeal blood circulation is delayed.Also, the thermometer has to be sterilized each time it is used, which is a problem. It was hot.

<Problems to be solved by the invention> The present invention has been made in view of the above problems.
The temperature of extracorporeal circulating blood can be measured accurately and quickly.
It is an object of the present invention to provide an inexpensive temperature measuring means that is free from the risk of contaminating blood.

<Means for Solving the Problems> That is, the present invention includes a hollow needle portion whose puncture side tip portion is formed into a conical closed tip, and an open end portion of the needle portion that is supported and fixed and fitted with a protector. A puncture needle consisting of a needle base formed so that the The temperature-sensing assembly includes a temperature-sensing element, a conductor for connecting the temperature-sensing element to a temperature display means, and a luer connector or rubber-like elastic body that can be inserted through and supported the conductor and tightly attached to the needle base. The present invention relates to a medical temperature measuring probe characterized by comprising a stopper.

<Function> The medical temperature measuring probe according to the present invention is configured such that a sterilized puncture needle whose needle portion is protected by a protector and a thermosensing assembly are detachably attached to each other, and the puncture side tip portion of the puncture needle is formed at the occluded tip, so when measuring the temperature of extracorporeally circulating blood,
The temperature-sensitive assembly housed in the tip of the puncture needle does not come into contact with blood, and the puncture needle can be made disposable. Therefore, there is no need to sterilize the temperature-sensing assembly, so if you use an inexpensive sterilized puncture needle and replace it every time you measure the temperature, blood will not be contaminated, and you can replace the inexpensive sterilized puncture needle. It is economical because it can be Furthermore, since the temperature sensing element of the temperature sensing assembly is housed in the tip of the puncture needle, heat conduction from the object to be measured to the temperature sensing element is good, and therefore accurate and rapid temperature measurement is possible.

<Example> Next, a medical temperature measurement probe according to an example of the present invention will be described based on the drawings.

FIG. 1 is a partially cutaway front view of the medical temperature measuring probe of the present invention, FIG. 2 is an explanatory diagram showing the constituent elements of the medical temperature measuring probe shown in FIG. 1, and FIG. FIG. 3 is an explanatory diagram showing a probe arrangement situation when measuring the temperature of blood flowing through a blood circuit using the medical temperature measuring probe shown in FIG. As shown in FIGS. 1 and 2, the medical temperature measuring probe 1 of the present invention is composed of a puncture needle 2 and a temperature sensing assembly 3. As shown in FIGS.

The puncture needle 2 includes a hollow needle part 4 whose tip on the puncture side is formed into a conical closed point, and this needle part 4.
A needle base 5 formed to be able to fit with a protector for supporting and fixing the released end of the needle part 4 and protecting the needle part 4.
The hollow part of the needle base 5 communicates with the hollow part of the needle part 4. The needle part 4 is generally made of stainless steel, and the needle base 5 is generally made of thermoplastic resin such as polypropylene, polyethylene, polystyrene, polycarbonate, methylpentene polymer, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, styrene-acrylonitrile copolymer, etc. It is formed using a polymer or the like.

The temperature sensing assembly 3 has a temperature sensing element 6 inserted into the closed tip of the puncture needle 2, and is shaped to be detachable from the open end of the needle base 5. A preferable example of the temperature sensing assembly 3 includes a temperature sensing element 6,
A conductive wire 7 for connecting the temperature sensing element 6 to a temperature display means (not shown), and a conductive wire 7 for supporting the conductive wire 7 so that the conductive wire 7 is inserted therethrough and does not move.
A plug 8 made of a rubber-like elastic material and formed so as to be tightly attached to the open end of the needle base 5 can be mentioned. The length of the conducting wire 7 between the temperature sensing element 6 and the elastic plug 8 is such that the length of the conductor 7 between the temperature sensing element 6 and the elastic plug 8 is
When the elastic stopper 8 is inserted into the hollow part and attached to the needle base 5, the temperature sensing element 6 is positioned so that it contacts and locks the inner wall of the closed tip of the puncture needle 2. As the temperature element 6, an appropriate element such as a thermistor, platinum wire, thermocouple, or pyroelectric element can be used.

The elastic stopper 8 supports the conducting wire 7 so that it does not move (that is, the temperature sensing element 6 does not move), and instead of the elastic stopper 8, a cap or a luer connector is also suitable as having the same function. It can be used for

Next, an example of use of the medical temperature measurement probe of the present invention will be described. As shown in FIG. 3, a blood circuit 9 is measured using the medical temperature measuring probe 1 of the present invention.
When measuring the temperature of flowing blood, remove the protector (not shown) from the puncture needle 2 of the probe 1, and then insert the probe 1 into the mixed injection port or blood collection port 10 (hereinafter simply referred to as port) of the blood circuit 9. It is done by puncturing. The port 10 is a part for administering medicine into the blood circuit 9 or collecting a blood sample from the blood circuit 9, and is made of a rubber-like elastic material, for example.
It is made of natural rubber, silicone rubber, isoprene rubber, butyl rubber, and various biocompatible elastomers.

Therefore, even if the blood temperature is measured by piercing the port 10 with the probe 1, the probe 1 is removed.
Since the port 10 self-closes due to the elasticity of the rubber-like elastic body forming the port 10, blood flowing through the blood circuit 9 does not leak out from the port 10.

After using the probe 1, the temperature-sensing assembly 3 can be removed from the puncture needle 2, the puncture needle 2 can be discarded, and the temperature-sensing assembly 3 can be attached to a new sterilized puncture needle 2. Solid 3 can be used repeatedly.

Note that when the probe 1 is used, the free end of the conductor 7 of the temperature sensing assembly 3 is connected in advance to a temperature display means (not shown), but the temperature sensing assembly 3 is formed integrally with the temperature display means in advance. It does not matter if it is in any other format.

<Effects of the Invention> As is clear from the above explanation, the medical temperature measuring probe of the present invention has the following advantages.

(1) Since the puncture needle and temperature-sensitive assembly are separate, only a sterilized puncture needle protected by a protector can be used disposable.
Economical.

(2) Since the tip of the puncture needle is formed into a closed tip, there is no risk that the thermosensing assembly will come into contact with blood;
Therefore, there is no possibility of contaminating blood.

(3) There is no need to sterilize the probe, which saves time and is economical.

(4) Accurate and quick temperature measurement is possible because the temperature sensing element is placed in contact with the inner wall of the tip of the puncture needle, which has good thermal conductivity.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the components of the present invention, and FIG. 3 is an explanatory diagram of the usage situation of the medical temperature measuring probe of the present invention. be. <Explanation of main symbols> 1: Medical temperature measurement probe, 2: Puncture needle, 3: Temperature sensing assembly, 4: Needle part,
5: Needle base, 6: Temperature sensing element, 7: Conductive wire, 8: Elastic stopper.

Claims (1)

[Scope of Claims] 1. A hollow needle portion whose puncture side tip portion is formed into a conical closed tip, and a needle base formed to support and fix the open end of the needle portion and to be able to fit with a protector. a puncture needle; a temperature-sensing assembly having a temperature-sensing element inserted into the closed tip of the puncture needle and detachable from the needle base; It is characterized by comprising a temperature element, a conductive wire for connecting the temperature sensing element to a temperature display means, and a luer connector or a stopper made of a rubber-like elastic material through which the conductive wire is inserted and supported and can be tightly attached to the needle base. Medical temperature measurement probe.