JPS5813842Y2 - Myocardial temperature measurement probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a myocardial temperature measuring probe for measuring myocardial temperature during open heart surgery.

The quality of myocardial protection during open-heart surgery is one of the important issues that directly affects the surgical outcome.

In particular, recently, the indications for surgery for severe heart disease have been expanded, and the number of cases in which long-term aortic occlusion is performed in cases of significant myocardial hypertrophy or myocardial damage is increasing, and the importance of myocardial protection is increasing.

To protect myocardium, hypothermia surgery has become routine in recent years.

This method uses ice water to maintain hypothermia in order to hinder Sixzo's metabolism, removes blood, and repairs the body during that time.

However, in this case, if the temperature is lowered too much, the state of the myocardial tissue will become irreversible, so it is especially important to monitor the temperature of the myocardium.

However, conventional probes for measuring myocardial temperature have a straight piercing needle with a built-in temperature sensing element such as a thermistor at the tip, and the piercing needle body is made of stainless steel or other materials with good thermal conductivity. Because this material is used, the exposed part of the myocardium comes into contact with the atmosphere or cooling water.

Therefore, the portion of the piercing needle body exposed from the myocardial portion is affected by this, which tends to cause a decrease in measurement accuracy.

The present invention has been developed in view of the above circumstances, and its purpose is to provide a myocardial temperature measurement probe that can improve measurement accuracy without being substantially affected by ambient temperature.

That is, the present invention has the following features: (1) an insulating head body formed with a surface that contacts the outer surface of the myocardium; a piercing needle protruding from the abutting surface of the head body; and the piercing needle. A probe for measuring myocardial temperature, characterized by comprising a temperature sensing element provided at the tip of a passing needle.

(2) The present invention provides the myocardial temperature measuring probe according to item (1), characterized in that a plurality of piercing needles having different protrusion lengths are provided.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 denotes the head body of the probe 2, which is formed of a heat insulating material such as silicone rubber into the shape of a disk with a diameter of 15 mm and a thickness of 5 mm.

One surface of the head body 1 is configured as an abutment surface 4 that rests directly on the surface of the myocardium 3 .

It is convenient to provide a plurality of small holes on the peripheral edge of the head body 1 for use when tying the myocardium 3 with suture threads.

Furthermore, a relatively short piercing needle 5 is provided protruding from the center of the abutting surface 4 of the head body 1.

This piercing needle 5 is made of a heat conductive material, for example stainless steel.

Further, the protruding length of the piercing needle 5 is approximately 2 to 15 mm depending on the patient's age, medical condition, etc., and the outer diameter is l,
It is 2mm.

Since the tip of the piercing needle 5 is formed into a sharp conical shape by the swaging method, the piercing needle 5
can be penetrated into the myocardium 3 until the abutment surface 4 of the myocardium 3 rests on the surface of the myocardium 3.

Therefore, the penetration depth is regulated by the protrusion length of the penetration needle 5.

Further, the tip of the piercing needle 5 has a built-in temperature sensing element, for example a thermistor 6, as shown in FIG.

The thermistor 6 is built in so as to be in contact with the surface inside the piercing needle 5.

In this case, it may be fixed using a thermally conductive adhesive.

Further, the thermistor 6 is connected to a cable 9 via electrically connected lead wires 7 and 8.

As shown in FIG. 2, a substrate 10 is embedded inside the head body 1, and the base ends of the piercing needle 5 and the cable 9 are supported on this substrate 10. There is.

Therefore, when using the probe 2, the piercing needle 5 is inserted into the myocardium 3 after performing open-heart surgery, and the abutting surface 4 of the head body 1 is placed on the surface of the myocardium 3. Push in until it hits.

As a result, the entire protruding portion of the piercing needle 5 is inserted into the myocardium 3, and the surrounding surface of the myocardium 3 is removed from the head body 1.
covered by.

That is, since the piercing needle 5 has no exposed part from the myocardium 3 and is covered by the head body 1, it is not affected by the surrounding atmospheric temperature or cooled by contact with heart cooling water. .

In other words, even if the main body of the piercing needle 5 is made of a material with good thermal conductivity, it is less susceptible to thermal disturbances, and the myocardial temperature can be accurately measured.

Moreover, since the penetration depth of the piercing needle 5 is determined at the position where the head body 1 hits the surface of the myocardium 3, the reliability of the measurement results can be improved.

Furthermore, since the configuration of the probe 2 allows for easy fixation such as sewing with a thread to the myocardium 3, it is also possible to prevent the piercing needle 5 from coming out due to muscle contraction, for example.

On the other hand, FIGS. 3 and 4 show other embodiments of the present invention, which have different protrusion lengths, for example, 5 mm and 2 mm.
A pair of piercing needles 11 and 12 mm are provided.

According to this method, it is possible to measure the temperature of different parts of the myocardium 3 in the thickness direction, and also to know the temperature gradient in the thickness direction of the myocardium 3.

Note that the other configurations are the same as those of the above embodiment, so the same reference numerals are given and the explanation thereof will be omitted.

As explained above, according to the present invention, the piercing needle portion is completely covered, and the myocardial surface around the piercing portion is also covered by the head body, so it is extremely unlikely to be exposed to thermal disturbances from the surroundings. Become.

Furthermore, the penetration depth of the piercing needle is determined at the position where the head body touches the surface of the myocardium, and the measurement position is determined accurately.

Therefore, accurate measurement of myocardial temperature is possible.

Further, the probe itself can be easily and accurately positioned and fixed, and has excellent effects such as being able to be mounted in a stable state.

[Brief explanation of drawings]

FIG. 1 is a side view of the probe in one embodiment of the present invention, FIG. 2 is a side sectional view of the probe, FIG. 3 is a side view of the probe in another embodiment of the present invention, and FIG. 4 is also a side sectional view of the probe. 1...Head body, 2...Probe, 3.
...Myocardium, 4...Abutting surface, 5...
...Piercing needle, 6...Thermistor, 7...
...Lead wire, 8...Lead wire, 9...
・Cable, 10... Board, 11...
Piercing needle, 12... Piercing needle.

Claims (2)

[Scope of utility model registration request] (1) An insulating head body that forms a surface that contacts the outer surface of the myocardium, a piercing needle that protrudes from the abutment surface of the head body, and a tip of the piercing needle. What is claimed is: 1. A probe for measuring myocardial temperature, characterized by comprising a temperature sensing element provided therein. (2) The myocardial temperature measuring probe according to claim 1, which is characterized in that it is provided with a plurality of piercing needles having different protruding lengths.