JPS62137031A - Sensor for measuring temperature in living body - 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] [Field of Application in Industry] The present invention relates to an in-vivo temperature measurement sensor, in which a piezoelectric element part and an antenna part are separated and connected by a flexible connecting member to stabilize the sensor sensitivity. The present invention relates to an in-vivo temperature measurement sensor that ensures safety for the living body when implanted in the living body.

[Conventional technology]

For example, one treatment for cancer involves irradiating the affected area with high-frequency energy and heating the affected area to a temperature of 42.5°C or higher to kill cancer cells. There are things to do. During this heating, if the normal cell portion exceeds 43°C, not only the cancer cells but also the surrounding normal cells will be killed. For this reason, multiple in-vivo temperature measurement sensors are implanted in the area to be heated, the in-vivo temperature is constantly measured, and based on the measurement results, the irradiation amount and irradiation time of high-frequency energy are controlled automatically or manually. While the septum is heated above 42.5°C, the temperature of the normal cell area must be controlled so as not to exceed 43°C.

FIG. 3 shows an embodiment of a conventional in-vivo temperature measurement sensor and in-vivo crystallinity measurement system J.

A crystal oscillator 2, which is a piezoelectric element, is implanted in a desired part of a living body, and electrodes 3a and 3b are attached to the outer peripheral surface of the crystal oscillator 2, and are connected to the electrodes 3a and 3b. , which has a predetermined number of turns and is composed of a crystal oscillator 2 and an anti-noise coil 4 forming a loop, and is sealed with a capsule 5 (for example, Teflon) to prevent intrusion of body fluids and corrosion by body fluids. (length approximately 20~15011
1. It forms a cylindrical carving with a diameter of 2 + n - 25 mm). On the other hand, the living body part includes an antenna coil 4 of the sensor 1, a sensor coil 7 of a probe 6 that performs BA'X coupling on the living body surface, a high frequency voltmeter 8 connected to both ends of the sensor coil 7, and a frequency variable A temperature measurement system consisting of an oscillator 9 and a frequency counter 10 that monitors the output frequency of the variable frequency oscillator 9 is provided.

In the 1-1- configuration, if the resonant frequency of the temperature sensor 1 is f, and the output frequency of the variable frequency oscillator 9 is changed near the resonant frequency f of the temperature sensor 1, then
The high frequency voltage 1i15 connected to the sensor coil 7 is
As shown in Figure (B), at the resonant frequency fr of the sensor 1, the electric current 1180,1 is minimum (this is) due to the anti-contact of the speaker 1 of the 1, the 1 of the 1, and the 1 of the 1 of the 6 This occurs because the high frequency energy applied to the sensor coil 7 is absorbed by the in-vivo temperature sensor 1 (dip phenomenon). Therefore, the frequency at which the indication of the high frequency voltmeter 8 becomes the minimum can be read by the frequency counter 10, and for example, the resonant frequency of the temperature sensor 1 which is known in advance as shown in FIG. It is possible to accurately know the internal body temperature in light of the relationship. In addition, a method for automatically measuring the internal body temperature has also been proposed (Japanese Patent Application No. 59-243
No. 097).

[Problem that the invention seeks to solve]

However, in the conventional four-way internal temperature measurement sensor, the crystal resonator, the antenna coil, and the connecting wire forming a loop between the crystal resonator and the antenna coil are housed in a relatively strong capsule 5. Since the size is specified, if the point to be measured is located deep inside the living body, the sensitivity of the sensor may deteriorate and the temperature within the living body may not be accurately and quickly measured. In addition, if the size of the sensor is made longer in order to stabilize the sensitivity and extended from a point to be measured deep inside the living body to near the surface of the living body, there is a risk that the sensor may protrude from inside the living body to outside the living body due to movements such as bending of the living body. However, it has the disadvantage that stability against living organisms cannot be ensured.

[Means and effects for solving the problems] The present invention has been made in view of the above, and is capable of stabilizing the sensitivity of the sensor, enabling accurate and rapid measurement of the temperature inside the living body, and reducing the temperature associated with the movement of the living body. In order to avoid danger to living organisms due to sensor protrusion, the piezoelectric element part and antenna part of the sensor are separated.
The object of the present invention is to provide an in-vivo temperature measurement sensor in which a flexible connecting member is used to connect the two.

〔Example〕

Hereinafter, one embodiment of the biological temperature measurement sensor according to the present invention will be described in detail.

FIG. 1 shows an embodiment of the in-vivo temperature measurement sensor 19 according to the present invention, which includes a piezoelectric element section 21 including a crystal oscillator 20, an antenna section 23 including an antenna coil 22, a crystal oscillator 20, and an antenna coil 22. It consists of a flexible communication member 29 consisting of a conducting wire 24 forming a loop therebetween.

The piezoelectric element part 21 includes a protective part +A'25 (formed of Teflon, for example), a crystal resonator 20 fixed within the Teflon protective member 25, and a film attached to the outer peripheral surface of the crystal resonator 20 (;J The girder electrodes 25a, 26b and the electrode 26
a and a conductor 24 connected to the conductor 25b.

The antenna section 23 has a predetermined number of turns, and the piezoelectric element section 21
The antenna is composed of an antenna coil 22 (here configured as a flat surface) that conducts induction and coupling to the outside regarding information from the antenna, and a cover 28 (formed of mesh, for example) that protects the antenna coil 22. ing.

The flexible communication member 29 is constructed of a device consisting of a conductive wire 24 and a protective member 30 (for example, Teflon coated) for protecting the conductive wire 24 from corrosion by body fluids, and its operation itself is similar to that of the conventional one. It is similar to an in-vivo temperature measurement sensor. Briefly stated, when the output frequency of the variable frequency oscillator is changed near the resonance frequency fr of the temperature sensor 19, the high frequency voltmeter connected to the sensor coil of the probe minimizes its voltage value due to a dip phenomenon.

Therefore, it is possible to read the frequency at which the indication of the high-frequency voltmeter is minimum, and to accurately detect the temperature within the living body.

However, according to the in-vivo temperature measurement sensor according to the present invention, it is possible to position the antenna coil 22 near the surface of the in-vivo body regardless of the position of the point to be measured in the living body, so that the sensor sensitivity can be stabilized, and Since the piezoelectric element part and the antenna part are connected by a flexible communication member, there is no fear that the sensor will protrude into the living body I due to movements such as bending inside the living body, and safety for the living body can be ensured.

FIG. 2 shows another embodiment of the in-vivo temperature measurement sensor according to the present invention. In this case, a plurality of piezoelectric element parts are connected to one antenna part via a flexible connecting member,
Although a plurality of piezoelectric elements are implanted at a plurality of measurement points, information from each sensor can be extracted from one antenna section.

As a result, it is possible to measure temperature at multiple locations within a living body without reducing sensor sensitivity or safety for the living body, which has the advantage of reducing the cost of the in-vivo temperature measurement sensor itself. .

〔Effect of the invention〕

As explained above, according to the biological temperature measurement sensor of the present invention, the piezoelectric element part and the antenna part of the sensor are separated and connected by a flexible connecting member, which stabilizes the sensitivity of the sensor and enables accurate and quick measurement. It is possible to measure the temperature inside the living body, and to avoid danger to the living body due to sensor protrusion due to movement of the living body.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the in-vivo temperature measuring sensor according to the present invention, Fig. 2 is an explanatory diagram showing another embodiment of the in-vivo temperature measuring sensor according to the present invention, and Fig. 3 (() o)
(C) is an explanatory diagram of a conventional in-vivo temperature measurement sensor and in-vivo temperature measurement system. Explanation of symbols 19 ---- In-vivo temperature measurement sensor 21 ---- Piezoelectric element part 23 ------- Antenna part 29 - Flexible communication member Patent applicant Toyo Tsushinki Co., Ltd. Agent: Shin Matsubara, 2nd Patent Attorney, Kiyoshi Muraki, Atsushi Kamijima - Hiroaki Sakai, 2nd Patent Attorney

Claims (2)

[Claims] (1) It is equipped with a piezoelectric element part whose resonant frequency changes depending on the temperature and an antenna part which transmits information from the piezoelectric element part to the outside, and is implanted at a point to be measured in a living body and the piezoelectric element is An in-vivo temperature measurement sensor that measures the temperature of a point to be measured by detecting a resonant frequency from outside the living body, characterized in that the piezoelectric element part and the antenna part are separated, and a flexible connecting member is used to connect them. In-vivo temperature measurement sensor. (2) The in-vivo temperature measurement sensor according to claim 1, wherein a plurality of said piezoelectric elements are provided and connected to a single said antenna part by said flexible communication member.