JPH0436805Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention uses a fingertip that is sandwiched between a light emitting element and a light receiving element, and converts the volume change of the blood vessel caused by the pulsation into an electrical signal by changing the amount of transmitted light. The present invention relates to a fingertip pulse wave sensor that detects the pulse wave.

[Prior Art] This type of conventional fingertip pulse wave sensor has a pad on the nail side of the fingertip in which one of a light-receiving element and a light-emitting element is embedded, and a pad on the ventral side of the fingertip in which the other is embedded. A plate spring type is well known in which a U-shaped plate spring is attached to the back of one of the pads so that the tip of the finger inserted between the two pads is held in a compressed state. be.

[The problem that the idea aims to solve]

In such a fingertip pulse wave sensor, it is important to accurately set the set position of the fingertip in order to ensure measurement accuracy when evaluating the detected waveform.
In particular, the accuracy of the detected waveform is expected to be able to non-invasively monitor the state of peripheral circulation by differentiating the detected waveform twice with respect to time and converting it into an acceleration curve. greatly affects the measurement results.

However, the fingertip setting surface of the conventional fingertip pulse wave sensor has not been sufficiently designed to accurately set the fingertip setting position.

Therefore, an object of the present invention is to provide a fingertip pulse wave sensor that allows the fingertip to be accurately set at a normal position.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a fingertip stopper that comes into contact with the tip of a fingertip set at a standard fingertip setting position. The fingertip pad is provided closer to the set surface than the nail position in front between the set surfaces.

It is advantageous to provide the fingertip stopper with a touch sensor that detects contact with the tip of the fingertip.

[Effect]

When the fingertip is inserted between the fingertip pad setting surface and the nail setting surface and moved forward, the fingertip tip contacts the fingertip stopper at the normal fingertip setting position.

If a touch sensor is installed on the fingertip stopper,
It becomes possible to notify that the finger tip has been set to the correct position.

[Example of idea]

FIG. 1 shows a fingertip pulse wave sensor according to an embodiment of the present invention, in which a U-shaped leaf spring 10 is attached to the bottom of a substantially U-shaped case 5. The upper end portion of this leaf spring functions as a fingertip pad setting surface 11, and is also perforated and has a light emitting element 12 attached thereto. A pad 22b equipped with a light receiving element 22 facing the light emitting element 12 is attached to the upper surface 20 of the case 5, and the front surface thereof is attached to the claw setting surface 22.
It functions as a. The normal distance between the nail setting surface 22a and the fingertip pad setting surface 11 is set narrower than the thickness of the standard fingertip 1. A fingertip stopper 15 is provided protruding from the case 5 in front between these surfaces, and its tip position is set so as to contact the properly set fingertip tip 1b, and prevent it from hitting the extended nail. It is located near the set surface 11 of the fingertip pad. Furthermore, a touch sensor 16 is embedded flush with the tip of the fingertip stopper 15, and detects contact of the fingertip tip 1b with the fingertip stopper 15. As such a touch sensor,
Strain gauges, pressure-sensitive conductive rubber, limit switches, etc. can be considered.

During the measurement, the fingertip 1 is inserted between the fingertip pad setting surface 11 and the nail setting surface 22a, and the leaf spring 10 is elastically separated by the fingertip pad 1a while moving forward, and the photoelectric elements 12 and 22 are On the other hand, when the fingertip tip 1b is set at the normal position, the fingertip tip 1b hits the fingertip stopper 15 and its forward movement is restricted. At this time, the touch sensor 16 detects the setting, and a notification means such as a light emission, a character display, or a buzzer notifies that the fingertips are set normally.

FIG. 2 shows another embodiment, in which the surface of the fingertip set base 30 includes, as shown in FIG. Guide walls 33 on both sides and a fingertip stopper 35 lower than the height of a standard nail are formed. The interval between the curved surface of the fingertip stopper 35 and the guide wall 33 is formed to be slightly larger than that of the standard fingertip 1. A hole 32 for escape of the fingertip pad is formed in the center of the fingertip pad setting surface 31, and a light emitting element 36 is arranged behind the hole 32.

This finger tip set base 30 has a cylindrical guide groove 3.
8, into which a slider pipe 44 of a pawl setting slider 40 is slidably inserted.
The inner surface of the arm attached to the upper end is formed as a claw setting surface 41, and a light receiving element 46 is attached facing the light emitting element 36. A helical spring 45 is housed inside the slider pipe 44. The length of this helical spring is set to be long enough to accommodate the amount of variation in the slide stroke due to individual differences in the thickness of the fingertip 1 when the nail setting surface 41 separates from the normal position according to the thickness of the fingertip. , a constant pressing force is always guaranteed.

Touch sensors 37, 37a are arranged on the surface of the fingertip stopper 35 and adjacent positions on the rear side of the hole 32, and a fingertip set signal generation circuit 4 generates a fingertip set signal in response to the respective detection signals.
7 and 47a are attached thereto, and further followed by an AND gate 48 which receives both finger tip set signals as input, and a light or sound notification means 49 which responds to the AND signal.

Guide finger tip 1 along between guide walls 33 and guide surface 34
The fingertip stopper 35 restrains the fingertip stopper 35 when it reaches the proper set position. At this time, the touch sensor 37 outputs a detection signal, and furthermore, the touch sensor 37 outputs a detection signal, and
If a is in contact with the fingertip pad setting surface 31 without floating, the touch sensor 37a also outputs a detection signal to notify the user. If either one of the touch sensors 37 or 37a is not in contact with the fingertip 1,
No finger tip set signal is generated and no notification is made.

The present invention can be applied to fingertip pulse wave sensors having various structures in which the fingertip pad set surface and the nail set surface on which the photoelectric elements are respectively disposed face each other so as to be elastically releasable. Furthermore, the shape of the fingertip stopper can be configured in various ways.

[Effect of idea]

As described above, according to the present invention, it is possible to easily set the fingertip accurately by feeling that the tip of the fingertip touches the fingertip stopper. Therefore, detection of erroneous measurement data is avoided, and a highly accurate pulse wave waveform can be detected. It also leads to improved inspection efficiency.

By placing the touch sensor on the fingertip stopper, the fingertip set can be monitored more reliably, which is convenient for inexperienced test subjects, and also convenient for not only the test subject but also the examiner. becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the central part of a fingertip pulse wave sensor according to one embodiment of the present invention, and FIG. FIG. 2b is a plan view of the fingertip pad setting surface portion of the same embodiment. 11, 31...Finger tip belly set surface, 12, 36...
...Light emitting element, 15,35...Fingertip stopper, 1
6, 37, 37a...Touch sensor, 22, 46
... Light receiving element, 22a, 41 ... Claw setting surface.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. From the normal state where the fingertip belly setting surface where the fingertip is set and the nail setting surface where the nail is set face each other closer than the thickness of a standard fingertip. In a fingertip pulse wave sensor, a standard finger pulse wave sensor is arranged so that they can be elastically separated from each other, and a light emitting element is placed on one side of the fingertip pad set surface and a nail set face, and a light receiving element is placed on the other side facing each other. The fingertip stopper that comes into contact with the tip of the fingertip set at the tip set position is provided closer to the fingertip pad setting surface than the nail position in front between the fingertip pad set surface and the nail set surface. Fingertip pulse wave sensor. 2. The fingertip pulse wave sensor according to claim 1, wherein the fingertip stopper is provided with a touch sensor that detects contact of the tip of the fingertip.