JP5402229B2 - Probe for measuring biological information - Google Patents

Description

  The present invention relates to a probe attached to a finger and used for measuring biological information such as blood oxygen saturation and pulse.

  By measuring biological information such as the pulse and blood oxygen saturation, it is possible to objectively observe the state of the subject's body. In the measurement of this biological information, photoelectric pulse wave measuring devices such as a photoelectric pulse wave meter and a pulse oximeter equipped with a probe attached to a human finger are used. For example, the pulse oximeter first projects light of two different wavelengths (red light and infrared light) from the probe attached to the finger of the subject, and the amount of light passing through the living body (finger). Detect changes. Then, the blood oxygen saturation (SpO2) is obtained based on the two-wavelength pulse waveform obtained from the detected light quantity change.

  When measuring the blood oxygen saturation and / or pulse with the photoelectric pulse wave measuring device, there is no need to collect blood, so there is very little invasion of the subject's body and it has continued for a long time (continuous) Measurement) is possible. In addition to short-term measurements such as diagnosing the condition of patients with chronic respiratory disease and routine monitoring of the patient's respiratory status, this also monitors sudden changes in the respiratory status of critically ill patients, It is also used for long-term measurements such as monitoring of respiration and blood oxygen saturation. Recently, the device has been miniaturized, and even if it is worn for a long time, it is difficult to get in the way. Therefore, measurement of blood oxygen saturation in patients with sleep apnea syndrome (SAS) (measured continuously for about 8 hours or more). It is also used during exercise such as measurement during daily life (necessary) and measurement of blood oxygen saturation during sports training.

  FIG. 7 is a sectional view of a conventional probe. As shown in FIG. 7, in the probe C, the upper housing 91 includes an upper holding portion 911 that comes into contact with the back side of the finger. The lower housing 92 includes a lower holding portion 921 that comes into contact with the palm side of the finger. The upper hold portion 911 and the lower hold portion 921 are members that press a finger. The upper housing 91 is provided with a light emitting unit 912 that emits light having a wavelength necessary for measurement with respect to a finger. The lower housing 92 is provided with a light receiving portion 922 that receives light emitted from the light emitting portion 912 and transmitted through the finger and converts the light amount into an electrical signal.

  The connecting portion 93 rotatably connects the longitudinal intermediate portions of the upper housing 91 and the lower housing 92. The connecting portion 93 serves as a fulcrum when the upper housing 91 and the lower housing 92 rotate. The upper housing 91 and the lower housing 92 rotate around the connecting portion 93, thereby The lower hold portion 921 approaches or separates. The central axis at the time of rotation passes through the central portion of the connecting portion 93 and extends in a direction orthogonal to the longitudinal direction of the probe C.

  The spring 94 is disposed in the connecting portion 93 and is a torsion coil spring that generates a force in the torsion direction. The spring 94 includes a coil portion 941 and a support portion 942 protruding in a tangential direction from both ends of the coil portion 941. The spring 94 is attached to the connecting portion 93, and the coil portion 941 is disposed so that the center thereof is the center of the upper housing 91 and the lower housing 92. One of the support portions 942 is attached to the upper housing 91 and the other is attached to the lower housing 92.

  When the spring 4 is attached to the probe C, the spring 4 is attached so as to generate a repulsive force by twisting from the original state. Accordingly, the probe C is biased in the closing direction, that is, in the direction in which the upper hold portion 911 and the lower hold portion 921 are pressed against each other. Note that if the force of the spring 94 is biased, the opening and closing of the probe C is likely to become unstable. Therefore, one spring 94 is disposed at each end of the probe C on the connecting portion 93 in the short direction.

  By opening and closing the upper hold portion 911 and the lower hold portion 921 so as to approach and separate, the spring 4 is twisted, and the repulsive force of the spring 4 acts on the upper housing 91 and the lower housing 92. As a result, the probe C presses the upper hold unit 911 and the lower hold unit 921 against the fingers and pinches the fingers. In the probe C, when the pressure contact force on the finger from the upper hold part 911 and the lower hold part 921 is within a predetermined range, the probe C is not easily displaced, and the subject is less likely to feel discomfort and pain to the finger. . This contact pressure is determined by the amount of force of the spring 94.

  Moreover, as a probe to be mounted on a conventional finger, for example, there are probes described in Japanese Patent Application Laid-Open Nos. 11-188019 and 7-236625. The probe described in Japanese Patent Application Laid-Open No. 11-188019 includes a pair of housings arranged to face each other, a pair of knob portions, and a spring that urges the pair of knob portions in a direction to separate the pair of knob portions, The pair of housings are separated when the pair of knobs are close to each other, and conversely, the pair of housings are close when the pair of knobs are separated from each other. By using the probe with this configuration, the optical axes of the light emitting element provided in one of the pair of housings and the light receiving element provided in the other are constant regardless of the thickness of the finger.

  Moreover, the probe described in Japanese Patent Application Laid-Open No. 7-236625 includes a pair of arms and a resilient bending member that connects the pair of arms. The pair of arms includes a soft member in contact with the part to be measured and a hard member provided on the outside thereof. According to this structure, the said soft member contacts with a subject's finger | toe, and the contact pressure to the said finger is adjusted because the said soft member deform | transforms.

Japanese Patent Laid-Open No. 11-188019 JP 7-236625 A

  However, a space for attaching the spring 94 is narrow in the probe C, and a coil spring having a small number of turns is used as the spring 94, and the spring constant becomes large. When the spring constant of the spring 94 is large, the amount of opening of the probe C (in this case, the thickness of the finger) changes, so that the force of the spring 94 changes abruptly. Since the amount of force of the spring 94 changes abruptly, the range of the opening amount that is less likely to shift and less likely to cause discomfort and pain is narrowed. That is, if the probe C is adjusted to be difficult to shift when attached to a thin finger, it is easy to feel discomfort and pain when attached to a thick finger, and conversely, it is difficult to feel discomfort and pain when attached to a thick finger. When it is adjusted to, it becomes easy to shift when worn on a thin finger.

  Similarly, in the probe described in Japanese Patent Application Laid-Open No. 11-188019, if the spring is adjusted so that it does not shift when attached to a thin finger, the contact pressure when attached to a thick finger increases, which makes the subject uncomfortable. It will be painful. Conversely, if the spring is adjusted so that the contact pressure is appropriate when attached to a thick finger, the contact pressure when attached to a thin finger becomes insufficient, the probe becomes unstable, and accurate measurement cannot be performed. .

  When the probe described in Japanese Patent Laid-Open No. 7-236625 is adjusted so that an appropriate contact pressure is obtained when the soft member is attached to a thin finger or a thick finger, the thickness of the soft member is increased. The probe must be large and heavy, and the burden on the subject is increased. In addition, when the thickness of fingers is greatly different, adjustment of the contact pressure with the soft member may not be sufficient, which may cause discomfort and pain to the subject, unstable mounting, and accurate Problems such as inability to measure may occur.

  Therefore, the present invention can accurately measure biological information over a long period of time regardless of the thickness of the finger to be worn, and reduce discomfort and pain to the finger on which the subject is worn. It is an object to provide a probe that can

  In order to achieve the above object, the present invention has a pair of housings, a connecting part that connects the pair of housings so as to be openable and closable, and a spring disposed inside the housing. A probe for measuring information, which adjusts the number of turns of a spring arranged in the housing.

  According to this configuration, the spring constant can be adjusted by adjusting the number of turns of the spring arranged at the arrangement location. By using a spring having a low spring constant, the change of the spring constant with respect to the opening amount of the probe can be suppressed low, and the change amount of the contact pressure to the finger can be suppressed low.

  When the thickness of the finger changes, the change in the contact pressure from the probe to the finger can be kept low. As a result, it is possible to provide a biological information measuring probe capable of measuring biological information while reducing discomfort and pain felt by the subject accurately and continuously for a long period of time regardless of the thickness of the fingers. is there.

  In the above configuration, the pair of housings are connected to each other at the connecting portion so that they can be connected to each other, and the springs are coil springs arranged in line with the fingers inside one housing, The housing may include a projecting portion that protrudes toward the one housing and has a tip portion that enters the inside of the one housing and is connected to an end portion of the spring.

  The said structure WHEREIN: You may provide the spring support shaft which penetrates the center of the said spring and suppresses that the said spring bends inside the said one housing.

  In the above configuration, a plurality of the springs may be arranged in a direction intersecting with the longitudinal direction of the fingers.

  In the above configuration, at least one of the springs may be a compression spring that is compressed to output a repulsive force, and at least one of the springs may be a tension spring that is pulled to output a repulsive force.

  According to the present invention, it is possible to accurately measure biological information over a long period of time regardless of the thickness of a finger to be worn, and to reduce discomfort and pain on the finger on which the subject is worn. It is possible to provide a probe that can

It is a perspective view in the state where the probe concerning the present invention was attached to a finger. It is sectional drawing of the probe shown in FIG. It is sectional drawing which cut | disconnected the probe shown in FIG. 2 by the III-III line. It is a figure which shows the relationship with the repulsive force of the spring which acts on the upper housing and lower housing when a probe opens. It is sectional drawing of the other example of the probe concerning this invention. It is a top view of the other example of the probe concerning the present invention. It is sectional drawing of the conventional probe.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the probe according to the present invention mounted on a finger, FIG. 2 is a cross-sectional view of the probe shown in FIG. 1, and FIG. 3 is a cross-sectional view of the probe shown in FIG. It is sectional drawing. The probe A according to the present invention is a probe for a pulse oximeter that is connected to a measuring device by a cable Ca and is attached to a finger of a subject and measures blood oxygen saturation (SpO2) and a pulse.

  As shown in FIG. 1, the probe A can rotate the upper housing 1 disposed on the back side of the finger, the lower housing 2 disposed on the palm side of the finger, and the upper housing 1 and the lower housing 2. And a spring 4 that biases the force in a direction in which the upper housing 1 and the lower housing 2 are closed.

  The upper housing 1 includes an upper holding portion 11 that comes into contact with the back side of the finger. The lower housing 2 includes a lower holding portion 21 that comes into contact with the palm side of the finger. The upper hold unit 11 and the lower hold unit 21 are members that press a finger. The upper hold part 11 or the lower hold part 21 is preferably in close contact with the finger, and a material that deforms in accordance with the shape of the finger, such as urethane foam resin or gel-like resin, can be used.

  The upper housing 1 includes a light emitting unit 12 that can emit light of a wavelength necessary for measurement (in the case of a pulse oximeter, about 660 nm: red light, about 880 nm: two different wavelengths of infrared light) to the finger. It has been. Although the LED is used as the light emitting unit 12, the light emitting unit 12 is not limited thereto, and a light source (for example, a discharge tube, a laser light source, etc.) capable of emitting light of a predetermined wavelength can be widely used. It is. A protruding portion 10 that protrudes toward the lower housing 2 is formed at a portion opposite to the upper holding portion 11 across the connecting portion 3 of the upper housing 1.

  The lower housing 2 is provided with a light receiving portion 22 that receives light emitted from the light emitting portion 12 and transmitted through the finger and converts the light amount into an electrical signal. The light receiving unit 22 is a silicon photodiode. However, the present invention is not limited to this, and an element that can convert light emitted from the light emitting unit 12 and transmitted through the finger into an electric signal can be widely used. The lower housing 2 includes a spring mounting portion 20 in which the spring 4 is disposed. Details of the protruding portion 10 of the upper housing 1 and the spring mounting portion 20 of the lower housing 2 will be described later.

  The connecting portion 3 has an upper connecting portion 31 formed at the intermediate portion of the upper housing 1 and a lower connecting portion 32 formed at the intermediate portion of the lower housing 2. The upper connecting portion 31 and the lower connecting portion 32 are arranged so as to overlap with each other, and are slidably supported by the lower housing 2 and the upper housing 1, respectively. The upper housing 1 and the lower housing 2 rotate freely within the movable range around the connecting portion 3, so that the upper hold portion 11 and the lower hold portion 21 approach or separate from each other. In addition, the axis | shaft may be penetrated so that the upper connection part 31 or the lower connection part 32 may not shift | deviate a rotation center. Further, the upper housing 1 and the lower housing 2 are made to approach / separate an end portion on the opposite side to the upper holding portion 11 and the lower holding portion 21 with the connecting portion 3 interposed therebetween, so that the upper holding portion 11 and the lower holding part 21 can be separated / approached.

  The spring 4 is a coil spring (so-called compression spring) that generates a force by a change in the axial direction (in the extending direction). As shown in FIGS. 2 and 3, the spring 4 is disposed in the spring mounting portion 20. The spring mounting portion 20 is formed inside the lower housing 2. The spring mounting portion 20 includes a flat spring receiving portion 201 with which one end of the spring 4 abuts, and two spring support shafts 202 that are juxtaposed from the spring receiving portion 201 and on which the spring 4 is fitted. It has. Two springs 4 are externally fitted and held on each of the two spring support shafts 202. In the probe A, the spring mounting portion 20 is formed along the longitudinal direction of the lower housing 2, and a long spring can be used as the spring 4. Further, the number of springs 4 is not limited to two, and the number of springs 4 that can cause force to act on the protruding portion 10 in a well-balanced manner can be widely used.

  The end of the spring 4 opposite to the spring receiving portion 201 is in contact with the spring mounting portion 20. The tip of the protrusion 10 formed on the upper housing 1 is in contact with the other end of the spring 4. When the spring 4 is disposed on the spring mounting portion 20, the spring 4 is disposed in a compressed state in advance. Thereby, when the probe A is in a closed state (a state in which the upper hold portion 11 and the lower hold portion 21 are in contact with each other: an initial state), the spring 4 presses the tip of the protruding portion 10. When the tip of the protrusion 10 is pushed, the force is urged in the direction in which the protrusion 10 and the upper housing 1 in which the protrusion 10 is formed rotate around the connecting portion 3. Further, when the spring receiving portion 201 is pushed by the spring 4, a force that causes the lower housing 2 to rotate in the direction opposite to the upper housing 1 around the connecting portion 3 is biased. Thereby, in the initial state, the upper hold portion 11 and the lower hold portion 21 are in close contact with each other due to the repulsive force of the spring 4.

  When the probe A is opened, the protruding portion 10 rotates around the connecting portion 3 in accordance with the rotation of the upper housing 1. The tip of the protrusion 10 is in contact with the spring 4, and a force is urged to the opposite side of the rotation by the repulsive force of the spring 4. By holding the fingers in this state, the upper hold unit 11 and the lower hold unit 21 can contact and press the fingers. In addition, if the contact pressure which acts on a finger from the upper hold part 11 and the lower hold part 21 when the fingers are clamped becomes smaller than a predetermined pressure, the frictional force between the upper hold part 11 and the lower hold part 21 and the finger. Decreases, and the probe A is easily displaced or dropped off. Further, when the contact pressure becomes larger than a certain pressure, the subject feels discomfort and pain in the finger to which the probe A is attached.

  In the probe A, the contact pressure exerted on the finger from the upper hold portion 11 and the lower hold portion 21 is determined by the amount of force of the spring 4. Here, the force of the spring 4 used in the probe A according to the present invention will be described with reference to the drawings. FIG. 4 is a diagram showing the relationship between the repulsive force of the springs acting on the upper housing and the lower housing when the probe is opened. In FIG. 4, the vertical axis represents the amount of force urged from the spring to the upper housing and the lower housing, and the horizontal axis represents the opening amount of the probe. Here, the opening amount of the probe indicates a gap between the upper side holding part 11 and the lower side holding part 21.

  First, the amount of force acting on the upper housing and the lower housing from the spring and the contact pressure acting on the finger from the upper hold portion and the lower hold portion will be described. The contact pressure applied to the finger is determined by the force of the spring 4 due to the structure of the probe A. The force of the spring 4 for generating the contact pressure for preventing the probe A from shifting or dropping off is P1, and the subject is Let P2 be the force of the spring 4 for generating a contact pressure that does not cause discomfort and pain.

  As shown in FIG. 4, in the probe A using the spring in which the relationship between the force amount and the opening amount is indicated by the straight line L1, when the opening amount is in the range of O1-O2, the force amount from the spring is P1 and P2. It fits in the hatched area. This probe A is capable of measuring biological information without being disengaged from the fingers while the opening amount is O1-O2, and without causing discomfort and pain to the subject.

  In addition, in the probe using the spring represented by the straight line L2 having a gentler slope than the straight line L1, when the opening amount is in the range of O2-O3, the probe does not deviate from the finger and does not cause discomfort and pain to the subject. In addition, measurement of biological information can be performed.

  In FIG. 4, the range of the opening amount is wider in the opening O2-O3 than in the O1-O2. In other words, it can be seen that when the inclination of the straight line becomes gentle, the range of the opening amount when the straight line enters between the force quantities P1 and P2 is widened. The inclination of the straight line is determined by the spring constant of the spring 4, that is, the smaller the spring constant is, the more the straight line becomes slanted and does not deviate from the fingers, and the range of the opening amount that does not cause discomfort and pain to the subject becomes wider.

  In coil springs, the spring constant can generally be reduced by increasing the number of turns of the spring. In the probe A, the spring mounting portion 20 is long, and the length of the spring 4 disposed on the spring mounting portion 20 is long. Therefore, the spring 4 has a wide adjustment range for the number of turns and a wide adjustment range for the spring constant. Thereby, in the probe A, it is possible to widen the range of the thickness of the finger that can be measured without causing discomfort and pain to the subject without shifting from the finger.

  In FIG. 4, the relationship between the amount of spring force and the amount of opening when a spring having a smaller spring constant is used is shown by a straight line L3. In the straight line L3, the amount of spring force is between P1 and P2 in the entire range O1-O4 in which the opening amount of the probe A can be measured. In other words, by using a spring having the characteristic indicated by the straight line L3, the probe A can measure biological information without being displaced from the finger regardless of the amount of opening and without causing discomfort and pain to the subject. Can do. In addition, in the straight line L3, the force when the opening amount is 0 is set to be larger than in other examples. The amount of force of the spring 4 when the opening amount is 0 is determined by the compression length from the natural length when the spring 4 is attached.

  The spring attachment portion 20 to which the spring 4 is attached in the probe A has the same length as the lower hold portion 21. The spring 4 is compressed and attached to the spring attachment portion 20, but since the length of the spring attachment portion 20 is long, the length for compressing the spring 4 at the time of attachment, that is, the repulsive force can be finely adjusted. Although not shown in the drawings, it is possible to easily perform the adjustment by using a cylindrical spacer that is externally fitted to the spring support portion 202 in order to adjust the length of the spring 4. Further, the spring receiving portion 201 may be formed so as to be slidable in the axial direction of the spring support shaft 202 and fixed at a predetermined position, and may be arbitrarily adjusted.

  Further, when the spring constant is reduced, the spring is likely to be bent. However, since the spring 4 is externally fitted to the spring support shaft 202, the direction in which the repulsive force of the spring 4 is generated is restricted to the axial direction of the spring support shaft 202. . Thereby, it is possible to suppress the force acting direction from being shifted due to the bending of the spring 4 and the amount of tightening force of the probe A from being insufficient.

  Further, since the spring 4 is fitted on the spring support shaft 202, the length of the spring 4 can be shortened to reduce the number of turns. For example, in the case of a probe in which the subject is limited to children, it is possible to use a spring whose measurable finger thickness is not so thick and whose force changes with a small opening amount. A short spring can be used by using a cylindrical spacer that is disposed between the end of the spring 4 and the protruding portion 10 and is externally fitted to the support shaft 202. Further, when the shape of the spring mounting portion 20 is a shape that can hold the spring 4 so as not to bend, the spring support shaft 202 may not be provided.

  Another example of the probe according to the present invention will be described with reference to the drawings. FIG. 5 is a sectional view of another example of the probe according to the present invention. The probe A2 shown in FIG. 5 has the same structure as the probe A shown in FIG. 2 except that the spring mounting portion 23 of the lower housing 2 is different, and substantially the same parts are denoted by the same reference numerals. Detailed descriptions of substantially the same parts are omitted.

  As shown in FIG. 5, the spring mounting portion 23 of the probe A <b> 2 is formed on the opposite side of the lower holding portion 21 with respect to the connecting portion 3. The spring 4 attached to the spring attachment portion 23 is a coil spring (a so-called tension coil spring) that is exhibited by being pulled (exhibits a force in a contracting direction). The spring mounting portion 23 has a hollow space, and a spring holding portion 231 that holds the spring 4 is formed on the inner side of the hollow space. The end of the spring 4 opposite to the spring holding portion 231 is fixed to the tip of the protruding portion 10.

  The spring 4 is attached to the spring attachment portion 23 in a state where it is stretched in advance. The protruding portion 10 is pulled by the spring 4, and the upper housing 1 is urged in a direction in which the upper hold portion 11 contacts the lower hold portion 21 with the connecting portion 3 as a fulcrum. In the lower housing 2, the spring holding portion 231 is pulled by the spring 4, and the lower housing 2 is biased in a direction in which the lower hold portion 21 contacts the upper hold portion 11 with the connecting portion 3 as a fulcrum. Thus, the probe A2 is in a state where the upper hold portion 11 and the lower hold portion 21 are in close contact (closed).

  As described above, by using the tension coil spring as the spring, the direction in which the force is generated by the spring 4 is stabilized regardless of the spring constant of the spring 4. Therefore, adjustment in the direction of the force amount of the spring is easy.

  Another example of the probe according to the present invention will be described with reference to the drawings. FIG. 6 is a plan view of another example of the probe according to the present invention. Detailed description of substantially the same parts as the probe A will be omitted. The probe B shown in FIG. 6 includes an upper housing 1, a lower housing 2, a connecting portion 3 that connects the upper housing 1 and the lower housing 2, and a spring that biases the upper housing 1 and the lower housing 2. And 5. The upper housing 1 and the lower housing 2 include an upper hold portion 11 and a lower hold portion 21 that come into contact with fingers and hold the fingers.

  The connecting portion 3 is provided with a connecting shaft 33 that serves as a rotation center of the upper housing 1 and the lower housing 2. The spring 5 is a torsion coil spring that repels when twisted. The spring 5 includes a coil portion 51 wound in a coil shape and support portions 52 and 53 extending in a tangential direction from the end portion of the coil portion 51. Further, the support parts 52 and 53 are provided with holding parts 521 and 531 which are bent and formed on the coil part 51 side so that the tip part is parallel to the coil part 51.

  The spring 5 is arranged so that the connecting shaft 33 penetrates the inside of the coil portion 51. The presser portion 521 of the support portion 52 is disposed in contact with the upper housing 1, and the presser portion 531 of the support portion 53 is in contact with the lower housing 2. The spring 5 is pre-twisted and attached to the probe B, and the repulsive force of the spring 5 acts on the upper housing 1 and the lower housing 2 in the direction in which the upper hold portion 11 and the lower hold portion 21 are in contact. Yes.

  The coil portion 51 of the spring 5 has substantially the same length as the length of the connecting portion 3. Therefore, the coil part 51 can increase the number of windings, and can set the spring constant in a wide range. By reducing the spring constant, the change in the force amount of the spring 5 relative to the opening amount of the probe B can be reduced, and the range of the opening amount of the probe B when the force amount of the spring 5 falls within a predetermined range. It can be widened.

  In the probe B, it is possible to widen the range of finger thicknesses that are less likely to be displaced and that are less likely to cause discomfort and pain. Thereby, it is possible to measure accurate biological information continuously for a long time without causing discomfort and pain with a common probe for many subjects.

  The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope thereof. It is needless to say that each part configuration of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

  The probe according to the present invention can be used as a measurement probe of a photoelectric pulse wave measuring apparatus that is attached to a finger and continuously measures a pulse and blood oxygen saturation for a long time.

A Probe 1 Upper housing 11 Upper hold portion 12 Light emitting portion 2 Lower housing 21 Lower hold portion 22 Light receiving portion 3 Connecting portion 4 Spring 5 Spring

Claims (5)

A pair of housings;
A connecting portion for connecting the pair of housings so as to be opened and closed by rotation ;
A biological information measuring probe for measuring biological information by holding a finger and having a spring disposed inside the housing,
The spring is a coil spring arranged in one of the housings so as to be aligned with the fingers and having one end connected to one end in the longitudinal direction of the one housing,
The other housing has a projecting portion that protrudes toward the one housing and has a distal end portion disposed on the opposite side of the one end portion with the coupling portion interposed therebetween, and the other end of the spring at the distal end portion. A biological information measuring probe characterized by being connected . The biological information measuring probe according to claim 1 , further comprising a spring support shaft that passes through a center of the spring and suppresses bending of the spring inside the one housing . The biological information measuring probe according to claim 2, wherein a plurality of the springs are arranged in a direction crossing a longitudinal direction of the fingers . The biological information measuring probe according to claim 2, wherein at least one of the springs is a compression spring that is compressed to output a repulsive force . The biological information measuring probe according to claim 2, wherein at least one of the springs is a tension spring that is pulled to output a repulsive force .

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