JPH0730007Y2 - Finger pulse wave sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention hinges a member having a fingertip abdomen setting surface and a member having a claw abutting surface that contacts a claw to each other or only one of them. By arranging a light-emitting element on one side of the finger-tip pad setting surface and the nail contact surface and a light-receiving element on the other side, a finger for detecting a volume change of the blood vessel due to a pulsation as an electric signal by a change in transmitted light amount. The present invention relates to a pulse wave sensor.

(Prior Art) A hinge-type fingertip pulse wave sensor of this type has already been used. For example, two arms each having a light-receiving element and a light-emitting element embedded therein are hinged to each other in a clothespin shape, and the hinge pin thereof is used. It is also well known that coil springs are attached to each other to urge each other toward each other.

[Problems to be solved by the device]

In such a fingertip pulse wave sensor, setting the fingertip setting position accurately is important for ensuring the accuracy when evaluating the detected waveform. In particular, in an accelerometer, which is expected to be capable of non-invasively monitoring the state of peripheral circulation by differentiating the detected waveform twice with respect to time and converting it into an acceleration waveform, the accuracy of the detected waveform is high. It greatly affects the measurement results.

However, in the conventional fingertip pulse wave sensor, sufficient consideration has not been given to accurately setting the fingertip setting position on the fingertip setting surface, and consideration has not been given to confirming a legitimate setting.

Therefore, it is an object of the present invention to provide a fingertip pulse wave sensor that allows a subject to easily set the fingertip at a regular position and easily confirm the setting at the regular position.

[Means for Solving the Problems]

In order to achieve this object, the present invention comprises a fingertip belly setting member having a fingertip belly setting surface, and a claw abutting surface for contacting a fingertip nail set on the fingertip belly setting surface. One or both of the abdomen setting member is hinged so as to open each other by inserting the fingertip, and the light emitting element is arranged on one side of the fingertip abdomen setting surface and the nail contact surface and the light receiving element is arranged on the other side. In front of the fingertip set surface, a fingertip stopper with a height that allows the protruding claws to escape is provided, and the tip of the fingertip set at the normal position on the fingertip set surface is detected on the surface of this fingertip stopper. The surface light-emitting body is made to respond to the detection signal of the touch sensor by integrating the planar touch sensor, and the translucent case upper surface which covers the claw contact surface and the light emitting element or the light receiving element in the case accommodating the claw setting member. LEDs on the top of the case to emit light as And sequenced.

[Action]

When the fingertips are set between the fingertip pad setting surface and the nail setting surface by the mutual separation due to the rotation between the fingertip belly setting member and the nail setting member, and set to the regular position in contact with the stopper, the touch sensor detects In response to the signal, the upper surface of the case emits light as a surface light emitter by the light emission of a plurality of LEDs inside the case, and notifies the examinee or the inspector of the setting to the regular position. In this state, the light receiving element receives the light transmitted from the finger tip from the light emitting element, and the volume change of the blood vessel due to the pulsation is detected as an electric signal.

[Example of device]

1 and 2 show a fingertip pulse wave sensor according to an embodiment of the present invention.

In these figures, reference numeral 10 is a fingertip belly setting member formed by accommodating a U-shaped leaf spring 11 functioning as a fingertip belly setting surface in a lower case 12. The side walls on both sides of the lower case 12 function as fingertip guide surfaces 12a, and the intermediate wall is formed as a fingertip stopper 13 for the tip of the fingertip. The height of this stopper is set so that it can be released forward without hitting the protruding claw.

Reference numeral 20 denotes a claw setting member housed in a lid-shaped upper case 21 that is hinged to the lower case 12 by a pin 29. Upper case
The lower end of the rear end face 21a of the lower case 21 abuts on the upper end of the rear end face 12b of the lower case 12, and is urged in the closing direction by a spring (not shown) set on the pin 29. In this normal closed state, cut out both sides and insert the fingertip insertion hole 17
Are formed. The light emitting element 23 is attached to the bracket 22 inside the upper case 21, and the lower surface thereof is formed as a claw contact surface 23a. Correspondingly, leaf spring 11
A light receiving element 16 is attached to the back side of the perforation 11a.

An electrode plate covered with an insulating sheet 15 is formed on the surface of the fingertip stopper 13 so as to form a capacitance type touch sensor.
14 is attached and integrated in a shape corresponding to the fingertip stopper 13 to form a substantial stopper surface. As is well known, a high frequency is applied to the electrode plate and
A high-frequency detection circuit that generates a binary output signal of OFF is attached, and when the tip of the fingertip 1 contacts, the electrode plate
When the change in capacitance between 14 and ground exceeds a specified amount, an ON detection signal is output. The upper case 21 that covers the bracket 22 is made of matte translucent synthetic resin, and a total of 10 LEDs 27 are arranged in two rows on the bracket 22. Surface emission is performed by these LEDs and the upper case 21. Forming the body.

At the time of measurement, the finger tip 1 is inserted from the finger tip insertion opening 17 and slid on the leaf spring 11 along the finger tip guide surface 12a, and the nail contact surface 23a
Is brought into contact with the nail of the fingertip 1 by the spring force. Then, when the fingertip 1 comes into regular contact with the central portion of the insulating sheet 15, the above-mentioned capacitance type touch sensor detects this, and all the LEDs 27 emit light in response to this detection signal, and the upper case 21 Emits light. Thereby, the subject can surely recognize the regular set. When the insulating sheet 15 is not in contact with the insulating sheet 15 or when the insulating sheet 15 is in contact with the insulating sheet 15 and deviates in the peripheral direction thereof, sufficient capacitance change of the electrode plate 14 cannot be obtained and the LED 27 does not emit light.
In such a light-emitting state, the light beam from the light-emitting element 23 passes through the fingertip 1 and is incident on the light-receiving element 16 located in the facing area to be photoelectrically converted, so that a stable waveform correlating with the natural volume change of the blood vessel. The signal is supplied to the device main body (not shown) of the finger plethysmogram.

3 and 4 show another embodiment of the present invention.
The rear ends of the fingertip abdomen setting plate 30 as a fingertip abdomen setting member are hinged to the shaft rods 39 protruding from the side walls on both sides of the finger tip abdomen setting member and the case 38 for the fingertip abdomen setting member. . A fingertip stopper 32 having a height lower than that of the nail of the fingertip 1 is formed at its tip so as to escape the extended nail, and the guide walls 30a on both sides are slightly wider than the width of the standard fingertip 1. Are formed. A hole 36 for escape to the fingertip pad 1a is formed in the central portion of the fingertip pad 1a where the fingertip pad 1a is located, and a light emitting element 37 is attached below the hole 36.

In the upper part of the case 38, the fingertip pad setting surface 31 in the normal state is
Claw set plate 40 having a claw contact surface 41 inclined substantially parallel to
Is formed as a nail setting member. Then, a hole 42 is formed facing the hole 36 and having a light receiving element 46 attached to the back.

A constant load mainspring 50 is stored below the fingertip abdomen setting plate 30, the inner end of which is pressed by a spring force to a rotating shaft 52 pivotally supported by an arm 51 provided below, and the outer end 50a is wound. It is returned and locked on the front surface of the case 38.

An electrode plate covered with an insulating sheet 34 is formed on the fingertip stopper 32 so as to form a capacitance type touch sensor similarly.
33 is attached and integrated in a shape corresponding to the fingertip stopper 32. The claw abutting surface 41 of the case 38 and the upper surface 38a that covers the light receiving element 46 are formed of smoke-treated translucent synthetic resin, and a plurality of LEDs 47 are arranged on the claw set plate 40. A surface light emitter is formed with the upper surface 38a.

When measuring, attach the tip of the fingertip to the fingertip stopper as shown.
When it is moved forward until it comes into contact with 32 and simply contacts the central portion of the insulating sheet 34, a change in capacitance is detected, the LED 47 emits light, and the upper surface 38a emits light. At this time, the fingertip abdomen set plate 3
0 is pushed down according to the thickness of the fingertip 1 and the constant force balance 5
0 is rewound corresponding to the descending stroke, and due to the constant load characteristic, the pressing force due to the winding force remains constant and appropriate. In this state, the fingertip 1 is stably positioned by appropriate pressure, and the pulse wave waveform is not distorted due to excessive pressure due to the variation of the fingertip thickness. Then, the light beam from the light emitting element 37 is transmitted through the fingertip 1 through the hole 36, is incident on the light receiving element 46 located in the area facing the hole, and is photoelectrically converted.

In the above-described embodiment, the touch sensor is not limited to the capacitance type, and another type that can detect the contact with the stopper only by making a light contact so as not to distort the pulse waveform is used. Can also be considered. Further, by making the touch sensor be followed by a timer, it is possible to generate a start signal for automatically starting the measurement when the detection signal is continuously generated for a predetermined time or longer. As the surface light emitter, various structures are conceivable, such as making the main region light-transmitting without using the cover itself as a light-transmitting body and using a light-emitting element other than the LED.

[Effect of device]

As described above, according to the present invention, since the feel of the tip of the finger tip hitting the stopper is obtained, accurate finger tip setting is facilitated. Moreover, by arranging the touch sensor on the stopper surface to notify the user of the setting to the regular position, it becomes easy to confirm not only the examinee but also the examiner. This is convenient even for an unfamiliar subject, avoids detection of erroneous measurement data, enables highly accurate detection of a pulse wave waveform, and improves test efficiency. Since the notification is made by the planar light emission that covers the fingertip, it can be easily confirmed, and the design is new and excellent.

[Brief description of drawings]

FIG. 1 is a perspective view of a fingertip pulse wave sensor according to an embodiment of the present invention in an open state, FIG. 2 is a sectional view of the fingertip pulse wave sensor according to the same embodiment during measurement, and FIG. A sectional view of the fingertip pulse wave sensor according to the embodiment at the time of measurement and FIG. 4 are sectional views taken along line AA of the fingertip pulse wave sensor according to the other embodiment. 1 ... fingertips, 10 ... fingertip belly setting member, 11 ... leaf springs, 13, 32
... fingertip stoppers, 14, 33 ... electrode plates, 15, 34 ... insulating sheet, 16, 46 ... light receiving element, 20 ... nail setting member, 23, 37 ... light emitting element, 23a, 41 ... nail contact surface, 27, 47… LED, 31… Finger tip set surface

Claims (1)

[Scope of utility model registration request] 1. A fingertip belly setting member having a fingertip belly setting surface, and a nail setting member having a nail contact surface for contacting a fingertip nail set on the fingertip belly setting surface. One or both of them are hinged so as to open each other by inserting a finger tip, a light emitting element is arranged on one side of the finger tip abdomen setting surface and the nail contact surface, and a light receiving element is arranged on the other side, and the finger tip is In front of the abdomen setting surface, a fingertip stopper having a height that allows the protruding claws to escape is provided, and the surface of the fingertip stopper detects the tip of the fingertip set at the normal position of the fingertip abdomen setting surface. -Shaped touch sensor is integrated, and the translucent case upper surface which covers the claw abutting surface and the light emitting element or the light receiving element in the case accommodating the claw setting member responds to a detection signal of the touch sensor. The light is emitted as a surface light emitter. Scan an array of a plurality of LED in the upper surface, the finger Togamyakuha sensor, characterized in that.