JP6667321B2 - Pulse oximeter probe - Google Patents

Description

  The present invention relates to a pulse oximeter probe.

A pulse oximeter is a medical device for non-invasively measuring arterial blood oxygen saturation (SpO ₂ ) using light, and a pulse oximeter probe is usually used for measuring such as a finger, toe, or earlobe. (For example, see Patent Document 1).

  In the pulse oximeter probe of Patent Literature 1, a light emitting element (for example, a light emitting diode) that emits red light or infrared light is provided toward a mounting portion, and light transmitted through the mounting portion is detected in a lower housing. A light receiving element (for example, a photodiode) is provided.

  The pulse oximeter has a signal processing circuit that performs measurement processing of arterial blood oxygen saturation using a detection signal of transmitted light or reflected light, and in this circuit, changes in the light detection level synchronized with the pulse of arterial blood are detected by red light. Is compared with the case of infrared light, and the arterial blood oxygen saturation is calculated from the ratio. Note that the pulse oximeter main body in which the signal processing circuit is built may be integrated with the pulse oximeter probe, or may be separate. In the latter case, the pulse oximeter probe is connected to the pulse oximeter body via a cable.

  A pulse oximeter probe is known as a clip-type probe that sandwiches a measurement site such as a finger from above and below (that is, from a fingernail side and abdomen side) with a pair of housings provided with a light emitting element and a light receiving element respectively. .

JP-A-7-236625

  In recent years, a pulse oximeter probe has been used for a walking test for measuring arterial oxygen saturation during walking in rehabilitation of patients with chronic respiratory failure and the like. For this reason, the pulse oximeter probe needs to improve the finger holding force of the upper and lower housings so as not to come off the finger during the walking test.

  In the clip-type pulse oximeter probe, when the finger holding force is to be improved, the upper and lower housing mounting portions with the finger are configured so as to be narrowed in the longitudinal direction along the finger corresponding to the finger, and the finger is connected to the finger. It is conceivable to increase the pinching force at the mounting location of.

  However, when the mounting portion of the upper and lower housings with the finger is configured to be thin, the upper and lower housings pinch the finger with the thinned mounting portion along the finger. Blood may be less likely to flow into the blood vessel, resulting in a low perfusion state. In the low perfusion state, the arterial blood oxygen saturation cannot be measured appropriately.

  An object of the present invention is to provide a pulse oximeter probe capable of accurately measuring arterial oxygen saturation by properly holding a finger or the like without tightening it.

One embodiment of the pulse oximeter probe of the present invention,
A housing part for the measurement site of the subject is formed between each other, and the light-emitting part and the light-receiving part are connected to each other so as to be openable and closable so that the distal ends forming the entrance of the housing part approach and separate from each other. And a pair of housings arranged opposite to each other,
A biasing member for biasing the distal ends in a direction to close each other,
In the pair of housings, the inner surface of at least one of the inner surfaces of the inner surfaces of the at least one housing, which is in contact with the measurement site inserted into the housing portion, is closer to the tip portion than the light-emitting portion and the light-receiving portion. A protruding surface portion protruding on the inner surface side of the housing of
The projecting surface portion holds the measurement site inserted from the entrance into the storage portion together with the other housing when the distal ends are closed ,
An inner surface of the first housing having the light emitting portion of the pair of housings is configured by a surface member made of a relatively soft material,
The inner surface of the second housing having the light receiving portion of the pair of housings is configured by a surface member made of a relatively hard material,
The projecting surface portion is provided on both inner surfaces of the pair of housings,
The height of the protruding surface provided on the first housing is higher than the height of the protruding surface provided on the second housing .

  ADVANTAGE OF THE INVENTION According to this invention, arterial blood oxygen saturation can be measured accurately, holding | maintaining suitably the installation site | parts, such as a finger, without tightening.

The figure which shows the external appearance of the pulse oximeter probe which concerns on one Embodiment of this invention. Perspective view showing the closed state of the probe Perspective view showing the open state of the probe FIG. 2 is a sectional view taken along line AA of FIG. 2. Diagram showing the positional relationship between the light-emitting part and light-receiving part of the probe attached to the finger

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing the appearance of a pulse oximeter probe (hereinafter, simply referred to as a “probe”) according to an embodiment of the present invention. FIG. 1A is a diagram viewed from the right, and FIG. 1B is a diagram viewed from below. FIG. 2 is a perspective view showing a closed state of the probe, and FIG. 3 is a perspective view showing an open state of the probe.

  The probe 10 shown in FIG. 1 is of a type having a cable 30 provided with a connector 20 connectable to a pulse oximeter main body (not shown).

The probe 10 is a clip-type probe having a pair of housings 11 and 12. The probe 10 will be described as a probe that is attached to a subject's finger by the housings 11 and 12 and measures arterial blood oxygen saturation (SpO ₂ ). Accordingly, the housing 11 that sandwiches the finger from the nail side with the surface on the fingernail side of the finger upward is referred to as an upper housing 11, and the housing 12 that sandwiches the finger from the belly side of the finger with the belly of the finger down is the lower housing 12. This will be described.

  The rear end portions 11a and 12a of the upper housing 11 and the lower housing 12 constitute an opening / closing operation section 13 for opening and closing the clip. The upper housing 11 and the lower housing 12 are swingably connected to each other at the rear end portions 11a and 12a, and the front end portions 11b and 12b approach and separate from each other so that they can be opened and closed (FIGS. 2 and 3). reference). Thus, when the user (the examiner or the subject himself or herself) grasps the opening / closing operation unit 13, the distal ends 11 b and 12 b of the upper housing 11 and the lower housing 12 open. Thus, the subject's finger can be inserted between the upper housing 11 and the lower housing 12 from the finger insertion port 15 side. The upper housing 11 and the lower housing form an accommodating portion for the measurement site of the subject between each other.

  FIG. 4 is a cross-sectional view taken along line AA of FIG.

  The upper housing 11 and the lower housing 12 are connected via a connecting portion 14 so as to be swingable with each other and to be able to move in parallel in the facing direction (vertical direction). Here, the connecting portion 14 includes a shaft portion 141 provided on the rear end portion 11a side of the upper housing 11 so as to protrude in a width direction (horizontal direction in the drawing) of the upper housing 11 and a rear end portion 12a side of the lower housing 12. And a guide wall 142 erected along the longitudinal direction. A guide hole 143 is formed in the guide wall portion 142, and the shaft portion 141 is loosely fitted in the guide hole 143 in the up-down direction and the swing direction.

  As shown in FIG. 4, a coil spring 16 as an urging member is provided between the upper housing 11 and the lower housing 12 when the tip portions 11 b and 12 b of the upper housing 11 and the lower housing 12 open. Are wound so that a return force for closing them works. As described above, the coil spring 16 urges the tip portions 11b and 12b in a direction to close each other. Therefore, after the subject's finger is inserted between the upper housing 11 and the lower housing 12, when the user releases the opening / closing operation unit 13, the distal end portions 11 b of the upper housing 11 and the lower housing 12 are activated by the force of the coil spring 16. , 12b are closed, and the subject's finger is pinched. At this time, the rear ends 11a and 12a can move in parallel in the vertical direction.

  When inserting a finger into the finger insertion port 15, the fingernail side faces the upper housing 11, and the finger belly side faces the lower housing 12. Therefore, the upper housing 11 and the lower housing 12 have a configuration suitable for sandwiching the subject's finger from the nail side and the abdomen side of the finger.

  The upper housing 11 and the lower housing 12 include a light emitting unit 51, a light receiving unit 52, and upper and lower surface members 61 and 62.

  The light emitting unit 51 and the light receiving unit 52 are provided on the upper housing 11 and the lower housing 12, respectively. The light emitting unit 51 and the light receiving unit 52 are arranged to face each other with the storage unit interposed therebetween. The light emitting unit 51 is configured by a light emitting element such as a light emitting diode, and the light receiving unit 52 is configured by a light receiving element such as a photodiode. The light emitting unit 51 emits red light or infrared light toward the sandwiched finger, and the light receiving unit 52 detects red light or infrared light transmitted through the sandwiched finger.

  The light emitting section 51 is embedded in the upper housing 11, and the light receiving section 52 is embedded in the lower housing. At this time, it is arranged such that light from the light emitting section 51 is received by the light receiving section 52. In the case of a reflection type instead of a transmission type, both the light emitting unit and the light receiving unit may be embedded in the upper housing 11 or may be embedded in the lower housing 12.

  The upper housing 11 and the lower housing 12 have upper and lower body portions 31 and 32 each having a connecting portion 14 at the rear end portions 11a and 12a, respectively. An upper surface member 61 is attached to the upper body portion 31 and a lower body portion The lower surface member 62 is attached to 32.

  Each of the main bodies 31, 32 is a relatively hard plastic molded body. The upper body 31 has a rear end 11 a of the upper housing 11 and a shaft 141, and the lower body 32 has a rear end 11 a of the lower housing 12 and a guide wall 142.

  The upper and lower surface members 61 and 62 are provided on a surface layer of the upper housing 11 and the lower housing 12 that comes into contact with a finger of a subject sandwiched therebetween.

  It is desirable that the upper and lower surface members 61 and 62 are composed of relatively soft members. In the present embodiment, the upper surface member 61 is formed of an elastic resin material such as silicon rubber. On the other hand, the lower surface member 62 is formed of a material harder than the upper surface member 61. As described above, the upper surface member 61 is made of a relatively soft material, and forms the inner surface of the upper housing 11 having the light emitting unit 51. The lower surface member 62 is made of a relatively hard material, and forms an inner surface of the housing 12 having the light receiving section 52. When a finger is pinched using a surface member made of a soft material that can be elastically deformed, the finger can be pinched while the surface member is crushed and in close contact with the finger, and the finger hardly comes off. The feeling of wearing is poor. Further, when a finger is pinched using a surface member made of a hard material, the abdominal side of the finger is crushed and adheres. As a result, the subject can be attached to the probe 10 with his / her fingertip deformed, so that a feeling of wearing the probe 10 can be obtained. In view of this point, the probe 10 improves the adhesion between the finger and the back of the finger by sandwiching the back side of the relatively hard finger with the upper surface member 61 made of a relatively soft material. And make it difficult for the fingers to come off. Further, the finger is deformed by being sandwiched by the relatively hard lower surface member 62 on the abdominal side of the finger, so that a feeling of wearing the probe 10 is obtained. As described above, in the present embodiment, in the upper housing 11 and the lower housing 12, the upper surface member 61 of the upper housing 11 is formed of a relatively soft material, and the lower surface member 62 of the lower housing 12 is formed of a relatively hard material. As a result, it is possible to achieve both the difficulty of removing the finger and the feeling of wearing the finger.

  The upper and lower surface members 61 and 62 have measurement surface portions 611 and 621 on which the light emitting unit 51 and the light receiving unit 52 are respectively arranged. At least one of the surface members 61 and 62 (for example, the surface member 61) is a measurement surface unit. It has a protruding surface portion (for example, protruding surface portion 612) that protrudes from (for example, the measuring surface portion 621) and sandwiches the measurement site. The protruding surface portion 612 sandwiches a finger (measurement site) inserted into the housing portion from the finger insertion port 15 together with the lower housing 12, which is the other housing, when the tip portions 11b and 12b are closed. In the present embodiment, protruding surfaces 612 and 622 are formed on both surface member 61 and surface member 62.

  Each of the upper and lower surface members 61 and 62 has a concave portion 610 and a concave portion 620 that are curved in accordance with the shape of a finger to be sandwiched. These recesses 610 and 620 extend along the longitudinal direction of the housing.

  The surface layers of these recesses 610 and 620 constitute measurement surface portions 611 and 621 and projection surface portions 612 and 622. Therefore, in this case, the surfaces of the measurement surface portions 611 and 621 and the protruding surface portions 612 and 622, that is, the inner surfaces of the upper and lower housings 11 and 12 on the distal end portions 11b and 12b side are concave shapes corresponding to the finger shape which is the mounting portion. I have.

  When the upper housing 11 and the lower housing 12 are closed, the measurement surface portions 611 and 621 are disposed vertically opposite to the back side of the finger insertion port 15 (see FIG. 4).

  The light emitting unit 51 and the light receiving unit 52 are disposed on the concave bottom surfaces of the measurement surface units 611 and 621, respectively, so that the light emitted by the light emitting unit 51 can be received by the light receiving unit 52.

  Here, when the upper housing 11 and the lower housing 12 are closed, the light emitting unit 51 and the light receiving unit 52 open the upper housing 11 and the lower housing 12 and face each other when mounted on the measurement site. They are arranged at different positions in the inserting direction. The light receiving unit 52 is located closer to the finger insertion opening 15 than the light emitting unit 51 in the insertion direction when the upper housing 11 and the lower housing 12 are closed.

  FIG. 5 is a diagram showing a positional relationship between the light emitting unit and the light receiving unit of the probe mounted on a finger.

As shown in FIG. 5, the light emitting unit 51 and the light receiving unit 52 open the upper housing 11 and the lower housing 12 and emit light when the SpO ₂ is measured with a fingertip which is an actual measurement site by being mounted on a subject. The light emitted from the portion 51 in the direction perpendicular to the light emitting surface is arranged at a position where the light enters the light receiving surface of the light receiving portion 52. The optical axis L of the light emitting unit 51 is perpendicular to the surface of the light receiving unit 62 (see FIG. 4) when the distal ends 11b and 12b are closed. Make an angle θ of 8 ° to 16 ° with respect to the direction. More preferably, θ is an angle in the range of 9 ° to 15 °. Here, the light-emitting unit 51 and the light-receiving unit 52 are disposed so as to have a positional relationship where θ is approximately 12 ° on the measurement surface portions 611 and 621 of the surface members 61 and 62, respectively.

  That is, the positional relationship between the light emitting unit 51 and the light receiving unit 52 is such that, in the closed state shown in FIG. This is an arrangement relationship in which the angle is within 16 °. More preferable θ is the same as the above range and specific value.

When the finger is used as the part to which the pulse oximeter is mounted, the part where the SpO ₂ is most easily detected in the test part located between the light emitting part and the light receiving part of the pulse oximeter is near the base of the nail. It has been known. In particular, at the fingertip, the artery and vein pass through both sides in the width direction and are connected by the fingertip.Therefore, it is possible to measure the arterial blood oxygen oxygen saturation concentration at the base of the nail while crushing the fingertip so as not to be in a low perfusion state. preferable.

  The measurement surface portions 611 and 621 are arranged at positions to accommodate these fingertips, and the light emitting unit 51 is desirably arranged at a position corresponding to the base of the fingernail.

  The measurement surface portion 621 contacts the belly of the finger, which is the lower surface of the measurement site.

  When the upper housing 11 and the lower housing 12 are attached to the measurement site, the protruding surfaces 612 and 622 sandwich the measurement site at a position avoiding the test site in the measurement site.

  The protruding surface portions 612 and 622 are arranged continuously in a curved surface on the finger insertion port 15 side with the measurement surface portions 611 and 621, respectively. Here, the protruding surfaces 612 and 622 form upper and lower opening edges that partition the finger insertion opening 15 up and down.

  Since the protruding surface portions 612 and 622 are formed in the concave portions 610 and 620, the protruding surface portions 612 and 622 each have a band-shaped surface having a concave cross section, and are more easily adhered to the finger as the mounting portion than the measurement surface portions 611 and 621.

  In each of the upper and lower surface members 61 and 62, the distance between the protruding surface portions 612 and 622 is shorter than the distance between the measurement surface portions 611 and 621. Therefore, the finger (inserted finger), which is a mounting part, is moved to the measurement surface portion 611. , 621.

Further, the height from the surface of the measurement surface portion 611 to the surface of the projection surface portion 612 is higher than the height from the surface of the measurement surface portion 621 to the surface of the projection surface portion 622. The protruding surface portion 612 is provided on the upper surface member 61, and the upper surface member 61 is made of a relatively soft material that sandwiches the upper side of the finger on the nail side, so that the upper surface member 61 holds the finger. Even in the case of being crushed and closely attached to the finger, the protruding surface portion 612 presses the finger more than the measurement surface portion 611 of the upper surface member 61, and provides a finger holding force for holding and holding the finger with the lower surface member 62. Can be secured.
Here, if the upper surface member 61 is made of a relatively hard material, the finger is in close contact with a step portion due to the height from the surface of the measurement surface portion 621 to the surface of the projection surface portion 622 of the projection surface portion 622. It gives a sense of discomfort and tends to give an unpleasant feeling of wearing. In addition, the finger easily falls off.
Further, the lower surface member 62 has a height from the surface of the measurement surface portion 621 to the surface of the protruding surface portion 622 lower than the height from the surface of the measurement surface portion 621 to the surface of the protruding surface portion 621 of the upper surface member 61. Therefore, the arterial blood oxygen saturation can be measured by holding the finger together with the protruding surface 622 without making the subject aware of the step.

  In the present embodiment, an upper surface member 61 made of a relatively soft material is disposed on the upper housing 11, and a lower surface member 62 made of a relatively hard material is provided on the lower housing 12 corresponding to the belly of the finger. Has been arranged. As a result, the arterial oxygen saturation can be accurately measured while preventing the finger from slipping out while providing a superior feeling of wearing. Also, in the upper and lower housings 11 and 12, the height of the protruding surface 612 of the upper surface member 61 made of a relatively soft material and the height of the protruding surface 622 of the lower surface member 62 made of a relatively hard material are determined by the upper and lower surfaces. It differs depending on the difference in crushing depending on the softness of each of the members 61 and 62. Thereby, it is possible to further improve the difficulty of removing the finger. Further, in the upper surface member 61, the upper area of the housing portion constituted by the upper surface member 61 is defined as a finger insertion port by the length of the protruding surface portion 612 protruding toward the lower surface member 62 from the measurement surface portion 612. Can be wider than 15.

  In the probe 10 of the present embodiment, as shown in FIG. 5, the protruding surfaces 612 and 622 are provided between the first joint K1 or the first joint K1 and the second joint K2 of the finger to be mounted as the measurement site. They are arranged correspondingly so as to be located between them.

  For this reason, when the probe 10 is mounted on the finger, the protruding surface portions 612 and 622 sandwich the measurement portion at a portion that abuts on the measurement portion by the coil spring 16, and the measurement portion is between the measurement surface portions 611 and 621. Rather than being held between the protruding surfaces 612 and 622. Further, the protruding surfaces 612 and 622 also have a function of engaging with the first joint K1 of the finger when the finger moves in the withdrawal direction. This makes it difficult for the upper and lower housings 11 and 12 to come off from the attached finger.

  In the probe 10, the upper housing 11 and the lower housing 12 are moved in a direction in which the respective distal end portions 11b and 12b are separated from each other, that is, in a vertical direction. Then, a finger is inserted between the upper housing 11 and the lower housing 12 from the finger insertion opening 15 so that the fingertip as a test site is positioned between the measurement surfaces 612 and 622, and the upper housing 11 and the lower housing 12 are closed. Then, the probe 10 is attached to the finger. In addition, the finger located between the measurement surface units 612 and 622 is arranged between the light emitting unit 51 and the light receiving unit 52. When the upper housing 11 and the lower housing 12 are swung to each other at the rear end portions 11a and 12a and opened in a V-shape, and the finger disposed between the measurement surface portions 611 and 621 is thick, the connection portion 14 side That is, the fingertip arranged on the back side presses the rear end portions 11a and 12a of the upper housing 11 and the lower housing 12 joined by the connecting portion 14 so as to be relatively separated in the vertical direction. Then, the shaft 141 moves vertically in the guide hole 143 against the urging force of the coil spring 16, and the upper housing 11 and the lower housing 12 move in parallel in the vertical direction. Thus, the upper housing 11 and the lower housing 12 are mounted on the finger (measurement site) regardless of the thickness of the finger (size of the measurement site).

  As shown mainly in FIG. 3, the upper surface member 61 of the upper housing 11 further has a pair of wall portions 61 b erected downward from the left and right end portions 61 a of the concave portion 610. The surface member 62 further has a pair of wall portions 62b erected upward from the left and right end portions 62a of the recess 620.

  As can be seen from FIG. 3, the wall 61b formed in the upper housing 11 and the wall 62b formed in the lower housing 12 extend along the recesses 610 and 620, respectively, in the longitudinal direction of the upper housing 11 and the lower housing 12. It has been extended. The wall portion 61b secures the light shielding property on the upper housing 11 side (light emitting portion 51 side) (that is, prevention of external light intrusion), and the wall portion 62b secures the light shielding property on the lower housing 12 side (light receiving portion 52 side). .

  The wall portion 62b formed in the lower housing 12 is curved and inclined toward the concave portion 620. Thereby, when a finger is inserted from the finger insertion port 15 side to the connecting portion 14 side (see FIG. 5) so as to slide on the surface of the upper surface member 62, the wall portion 62b is pushed outward by the entering finger. Can be At this time, a return force is generated to return the wall portion 62b to its original position due to its elasticity. Since this force acts as a force for supporting the finger in contact with the wall portion 62b from the left and right, the finger can be hardly shifted in the left and right direction. Since the wall portion 62b is in close contact with the finger, it is possible to make it difficult for the finger to be displaced in the finger insertion / removal direction (in other words, the longitudinal direction of the housing). That is, the mounting stability of the probe 10 can be improved. In addition, this may make it possible to stably suppress the intrusion of external light, and as a result, the measurement accuracy of the arterial blood oxygen saturation can be significantly improved.

  In addition, since the wall 62f (see FIG. 4) for preventing further entry of the finger is formed at the far end of the surface member 62, the inserted finger can be positioned.

  Note that the wall portion 61b extending downward from the left and right end portions 61a of the concave portion 610 is disposed outside the wall portion 62b extending upward from the left and right end portions 62a of the concave portion 620 as shown in FIG. . Therefore, the support of the finger by the wall portion 62b is not hindered by the wall portion 61b.

  In the probe 10 of the present embodiment, the protruding surfaces 612 and 622 of the surface members 61 and 62 sandwich the measurement site (finger) at a site apart from the fingertip (actual test site) of the measurement unit. In the present embodiment, when worn on the finger, the light emitting unit 51 is arranged at a position corresponding to the base of the nail, which is the test site, and the light receiving unit 52 is arranged in close contact with the belly of the finger. . Further, the protruding surface portion 612 is arranged corresponding to the abdominal portion between the first joint K1 and the second joint K2 as described above. In other words, the protruding surface portion 612 closely adheres to the back of the finger and the belly of the finger at the recessed portion between the first joint K1 and the second joint k2 with the back of the relatively hard finger away from the test site. The fingers are held together with the inner surface of the housing 12 (here, the protruding surface portion 622 that is in close contact with the abdomen between the first joint K1 and the second joint K2). Thus, the finger to be measured is held without crushing the periphery of the test location, specifically, the fingertip where blood vessels gather. As described above, the probe 10 can sandwich and hold the measurement site between the protruding surfaces 612 and 622 that abut on the measurement target by the urging force of the coil spring 16 without generating low perfusion. Therefore, in a walking test or the like, even when the probe 10 moves in the direction in which the arm 10 is displaced from the finger that is worn by swinging the arm, that is, when the finger attempts to move in the withdrawal direction, the first protruding surfaces 612 and 622 of the finger are Since the probe 10 is hooked on the joint K1, it becomes difficult for the probe 10 itself to fall out of the finger.

As described above, in the present embodiment, the mounting portion to be mounted on the finger, which is the measurement site, is mounted on the finger with a simple configuration without being thinned along the shape of the finger, in a state in which the fingertip is not easily released without crushing the fingertip. Then, SpO ₂ can be measured at the base of the nail. Thus, even during a walking test, SpO ₂ (arterial blood oxygen saturation) can be accurately and stably measured for a subject during exercise by preventing low perfusion.

  In the probe 10 according to the present embodiment, the upper and lower housings 11 and 12 are configured to be swingable with each other via the shaft 141 on the rear end portions 11a and 12a, and to be connected so as to be vertically movable in parallel. However, the present invention is not limited to this, and the same effect can be obtained even when the upper and lower housings 11 and 12 are connected to each other by vertically moving in parallel without swinging each other as long as the tip portions 11b and 12b can be opened and closed. Can play.

  The embodiment of the invention has been described. The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. That is, the description of the configuration of the device and the shape of each part is merely an example, and it is apparent that various changes and additions to these examples are possible within the scope of the present invention.

  The pulse oximeter probe according to the present invention has an effect of measuring arterial blood oxygen saturation, which is suitably held without tightening a mounting site such as a finger, and is particularly used together with a pulse oximeter used for a walking test. Is useful as

10 probes (pulse oximeter probe)
DESCRIPTION OF SYMBOLS 11 Upper housing 11a, 12a Rear end part 11b, 12b Tip part 12 Lower housing 13 Opening / closing operation part 14 Connecting part 15 Finger insertion port 16 Coil spring 20 Connector 31 Upper main body part 32 Lower main body part 51 Light emitting part 52 Light receiving part 61 Upper surface Member 62 Lower surface member 141 Shaft part 142 Guide wall part 143 Guide hole 610, 620 Depression 611, 621 Measurement surface part 612, 622 Projection surface part

Claims (3)

A housing part for the measurement site of the subject is formed between each other, and the light-emitting part and the light-receiving part are connected to each other so as to be openable and closable so that the distal ends forming the entrance of the housing part approach and separate from each other. And a pair of housings arranged opposite to each other,
A biasing member for biasing the distal ends in a direction to close each other,
In the pair of housings, the inner surface of at least one of the inner surfaces of the inner surfaces of the at least one housing, which is in contact with the measurement site inserted into the housing portion, is closer to the tip portion than the light-emitting portion and the light-receiving portion. A protruding surface portion protruding on the inner surface side of the housing of
The projecting surface portion holds the measurement site inserted from the entrance into the storage portion together with the other housing when the distal ends are closed ,
An inner surface of the first housing having the light emitting portion of the pair of housings is configured by a surface member made of a relatively soft material,
The inner surface of the second housing having the light receiving portion of the pair of housings is configured by a surface member made of a relatively hard material,
The projecting surface portion is provided on both inner surfaces of the pair of housings,
A height of the protruding surface provided on the first housing is higher than a height of the protruding surface provided on the second housing;
Pulse oximeter probe. The protruding surface portion is provided on an inner surface of the distal end portion of at least one of the pair of housings,
The pulse oximeter probe according to claim 1. The protruding surface portion is provided to protrude in directions facing each other on both of the pair of housings.
The pulse oximeter probe according to claim 1.

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