JP2574628Y2 - Photoplethysmography probe - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe for measuring a photoplethysmogram for measuring a component such as oxygen concentration in blood while holding a part of a living body such as a fingertip.

[0002]

2. Description of the Related Art As a detection end of a pulse oximeter for measuring a component such as oxygen concentration in blood, a probe for holding a fingertip and optically measuring a pulse wave is used. In this probe, an LED serving as a light emitting member and a photodiode (hereinafter referred to as a PD) serving as a light receiving member are attached to the other end of a pair of supporting members having one end rotatably connected to each other. It is configured such that a fingertip is inserted between the PD and the PD and held by a spring force. Then, the light emitted from the LED is received by the PD through the blood flowing in the blood vessel of the fingertip, and the component in the blood is measured based on the output value of the PD.

[0003]

However, in the conventional probe for a pulse oximeter, the opposing surface of the support member for holding and fixing the fingertip is flat, so that the blood flow in the peripheral circulatory system is particularly poor. In an examiner or the like, there is a possibility that the blood flow may be obstructed by being pinched and pressed by a support member having a strong spring force. As a result, there has been a problem that accurate and stable measurement of blood components cannot be expected.

The present invention has been made in view of the above points, and provides a probe for measuring a photoplethysmogram capable of preventing blood flow obstruction from occurring and measuring blood components accurately and stably. With the goal.

[0005]

According to a first aspect of the present invention, there is provided a probe for measuring a photoelectric pulse wave, comprising: a pair of support members provided such that a light emitting member and a light receiving member face each other near their ends ; The pair of support members are brought close to each other.
And a spring for biasing the light-emitting member, wherein the light-emitting member and the light-receiving member are formed of an elastic member on at least one of the opposing surfaces thereof.
The top and bottom of the convex part of this concave and convex part
It is characterized in that it abuts on a plurality of points in a point-like manner with respect to the mounting portion of the wing .

According to a second aspect of the present invention, there is provided a probe for measuring a photoplethysmogram, wherein the uneven portion is a wavy surface formed on at least one of the opposing surfaces.

According to a third aspect of the present invention, there is provided a probe for measuring a photoplethysmogram, wherein the concave and convex portions are a plurality of protrusions provided on at least one of the opposing surfaces.

[0008]

According to the above arrangement, for example, when the probe is clamped and fixed to the fingertip, the abdomen and the back of the finger come into contact with the uneven portions formed on the opposing surfaces of the light emitting member and the light receiving member, so that a large number of fulcrum points are provided. Therefore, the finger blood vessel in the portion facing the concave portion is not pressed, and blood flow inhibition in that portion does not occur. As a result, based on the principle of the pulse oximeter, it is possible to accurately and stably measure blood components, for example, blood oxygen saturation or dye dilution type cardiac output.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 5 show an embodiment of the present invention.
In the figure, a pair of support members 1 and 2 provided to face each other
In the vicinity of the base end, a pair of shaft supports 3 and 4 are integrally provided upright. A support shaft 5 is inserted through the distal ends of the shaft support portions 3 and 4, and the support members 1 and 2 are rotatably connected via the support shaft 5. Further, a coil spring 6 is wound around the support shaft 5, and both ends of the coil spring 6 are locked to the side surfaces on the base end side of the shaft support portions 3 and 4, respectively.
2 are biased to rotate in the direction in which they approach each other.

Hollow box-shaped shield members 7 and 8 are fixed to the inner surfaces of the support members 1 and 2 on the front end side, and LEs are provided inside the opposed surfaces of the shield members 7 and 8 respectively.
D9 and PD10 are attached. LED9,
Printed circuit boards (hereinafter referred to as PCB)
11 and 12 are provided. Further, relay PCBs 13 and 14 are provided in the shield members 7 and 8, respectively, and the PCBs 11 and 13 and the PCBs 12 and 14 are connected by lead wires 15 and 16, respectively. In addition, relay PCBs 13 and 14
The space between them is connected by a cord 17, and the PCB 11 is connected to a cord fixed connection PCB 18 provided in the shield member 7 by a lead wire 19. One end of a signal relay cable 20 is connected to the PCB 18.

On the other hand, each of the shield members 7 and 8 has an LE
Outside caps 21 and 22, each of which is formed of silicon, is mounted outside the position corresponding to D9 and PD10. Also, the shield members 7 and 8 and the caps 21 and 22
And elastic members 23, 24 such as sponge, urethane, etc.
Are formed on the opposing surfaces of the elastic members 23 and 24. Corrugated surfaces 23a and 24a are formed as uneven portions. Further, round holes 23b and 24b are formed at positions where the elastic members 23 and 24 are aligned with the optical axes of the LED 9 and the PD 10, respectively. Further, the side that contacts the abdomen of the finger when the subject's finger is held between the support members 1 and 2, that is, the elastic member 23 on the LED 9 side and the side that contacts the back of the finger, that is, the elastic member 24 on the PD 10 side is It is made of a slightly harder material so that only the convex portions of the wavy surfaces 23a and 24a contact the finger during measurement.

According to this embodiment, the proximal ends of the support members 1 and 2 are held between fingers, the distal end is opened, the fingertip is inserted into the distal end, and the probe is fixed to the fingertip by the urging force of the coil spring 6. When the surface of the elastic member 23 that contacts the abdomen of the finger, a wavy surface
23a also has a wavy surface on the surface of the elastic member 24 that abuts against the back.
Since 24a is formed, only the convex part of the wavy surface abuts on the abdomen and back of the finger. Therefore, the finger is pressed by a large number of fulcrums, and the concave portion of the wavy surface does not contact the finger, and the blood flow of the finger in the portion facing the concave portion is not hindered. Therefore, it is possible to prevent the occurrence of an error caused in the measurement of a peripheral pulse wave of a pulse oximeter or the like due to the obstruction of the blood flow, and to perform an accurate and stable measurement.

Since the LED 9 and the PD 10 are supported by the support members 1 and 2 via the shield members 7 and 8 and the elastic members 23 and 24, respectively, the effects of vibration and the tensile force of the cable 20 are reduced, and the LED 9 and the PD 10 are stabilized. Measurement can be performed.
Further, since the pressure applied to the finger of the probe becomes uniform, the probe does not shift.

FIGS. 6 and 7 show another embodiment of the present invention. In the above-described embodiment, the case where the uneven portions formed on the opposing surfaces of the elastic members 23 and 24 are the corrugated surfaces 23a and 24a has been described. However, the uneven portions have a plurality of columnar shapes as shown in FIGS. May be constituted by the projections 31. Reference numeral 32 shown in FIG. 6 is a net-shaped shield member. According to this embodiment, the same effect can be obtained.

In each of the above embodiments, the uneven portion is formed by the elastic member 2.
3 and 24, but the elastic members 23 and 24 are omitted, and the concave and convex portions are directly indicated by the pointing members 1 and 2 or the shield members 7 and 24.
8 may be provided on the opposing surface, and at least one of the opposing surfaces may be provided with an uneven portion. Further, in each of the above embodiments, the case where a part of the living body to be clamped is a fingertip has been described in detail. However, the present invention is not limited to this. For example, any part that can detect pulsation of blood flow such as an earlobe can be used. It can be implemented similarly.

[0017]

[Effects of the Invention] As described above, according to the present invention,
At least one of the opposing surfaces of the light-emitting member and light-receiving member in a photoelectric pulse wave measurement probe such as a pulse oximeter
An uneven portion formed by an elastic member is provided, and the uneven portion is formed.
The tip of the convex part is dotted at multiple locations with respect to the mounting site of this probe
As a result, the influence of blood flow obstruction during measurement is eliminated, and accurate and stable measurement of blood components can be performed. In addition, the influence of vibration and the tensile force of the cable is reduced, and similarly, stable measurement can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of FIG.

FIG. 3 is a longitudinal sectional view of FIG.

FIG. 4 is an exploded perspective view of the LED side of FIG. 1;

FIG. 5 is an exploded perspective view of the PD side in FIG. 1;

FIG. 6 is a perspective view showing a configuration of an elastic member according to another embodiment of the present invention.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

[Explanation of symbols]

1, 2 Support member 9 LED (light emitting member) 10 PD (light receiving member) 23a, 24a Wavy surface (irregular part) 31 Projection (irregular part)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-238225 (JP, A) JP-A-57-49429 (JP, A) Jikai Sho-57-79509 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) A61B 5/02

Claims (3)

(57) [Scope of request for utility model registration] A pair of support members provided so that a light emitting member and a light receiving member face each other in the vicinity of their respective ends.
And the pair of support members are urged to be close to each other.
The light-emitting member and the light-receiving member are each formed of an elastic member on at least one of the opposing surfaces thereof.
The tip of the convex part of this concave and convex part
A probe for measuring a photoelectric pulse wave, which is abutted at a plurality of points with respect to a mounting part . 2. The photoplethysmographic probe according to claim 1, wherein the uneven portion is a wavy surface formed on at least one of the opposing surfaces. 3. The photoplethysmographic probe according to claim 1, wherein the projections and depressions are constituted by a plurality of projections provided on at least one of the opposing surfaces.