JPH0342893Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a cuff for a finger compression type electronic blood pressure monitor (electronic finger blood pressure monitor), and is a pulse wave sensor consisting of a receiving/emitting element. This invention relates to a cuff for an electronic finger blood pressure monitor with an expanded wave detection range.

(b) Conventional technology In a conventional digital finger blood pressure monitor, a light receiving element and a light emitting element are placed facing each other on the circumferential wall of the finger insertion hole of a cuff that presses the finger, and light is projected from the light emitting element to the finger artery. This was a transmission type device in which the transmitted light was received by a light receiving element.

In this transmission method, since light is transmitted over a distance corresponding to the width of a finger, sufficient sensitivity cannot be obtained and highly accurate measurement cannot be performed.

Therefore, the applicant of the present application previously provided a light receiving element 62 and a light emitting element 63 close to each other on the circumferential wall of the finger insertion hole 61 of the cylindrical cuff 6 as shown in FIG.
We proposed a so-called reflection type cuff (pulse wave detector) in which light is projected from a light emitting element 63 to a finger artery 64 and the light reflected from the finger artery is received by a light receiving element 62 (Tokugan Sho).
No. 60-78658).

According to this reflection method, the distances between the light emitting element, the light receiving element, and the finger artery are close to each other, and the optical path is short. Therefore, the detected pulse wave signal level is significantly higher than that of the transmission method, and the sensitivity is improved.

(c) Problems to be solved by the invention The cuff proposed by the applicant has a pair of single light-receiving element and light-emitting element, which are arranged close to each other on the circumferential wall of the finger insertion hole ( (See Figure 6).

Therefore, the measurer inserts his or her finger into the finger insertion hole of the cylindrical cuff in a proper state, that is, in a state that corresponds to the light receiving and emitting elements arranged by measuring the case where the finger has been properly inserted in advance. In this case, a desired pulse wave as shown in FIG. 7 can be detected.

However, in the case of this cuff, since the receiving and emitting elements are each single and arranged close to each other, the range in which pulse waves can be detected is narrow, as shown by the broken line in FIG. 6.

Therefore, the position of the artery running inside the finger varies depending on the person measuring it (there is a difference of about 30 degrees between individuals), so even if the finger insertion angle is appropriate, it is difficult to always obtain an appropriate pulse wave. It is difficult to say that it can be detected.

Particularly, as shown in FIG. 8, when a finger is inserted at a certain angle into the finger insertion hole 61 of the cuff 6, the finger artery 64 deviates from the pulse wave detection range. In this case, it has recently been found that only a pulse wave with an unclear peak value as shown in FIG. 9 can be detected, and there is a disadvantage that accurate blood pressure cannot be measured.

This invention solves the above-mentioned problems of conventional devices, and has a wide range of pulse wave detection.
The purpose of the present invention is to provide a cuff for an electronic finger blood pressure monitor that can always detect an appropriate pulse wave.

(d) Means and action for solving the problem In order to achieve this objective, the cuff of the digital finger blood pressure monitor of this invention has the following configuration.

The cuff of the digital finger blood pressure monitor is a finger pressure type electronic blood pressure monitor in which a light receiving element and a light emitting element for detecting pulse waves are provided close to each other on the circumferential wall of the finger insertion hole of the cylindrical cuff, and A plurality of at least one of the light receiving and light emitting elements is provided.

In the cuff of an electronic finger blood pressure monitor configured like this,
Since a plurality of light-receiving elements and light-emitting elements constituting the pulse wave sensor are arranged close to each other alternately,
The pulse wave detectable range has been expanded. Therefore, it is possible to absorb not only individual differences in the position of the finger artery, but also variations in the position of the finger artery, even if the finger is improperly inserted at a certain angle into the finger insertion hole of the cuff.
Appropriate pulse waves can always be detected.

(E) Embodiment FIG. 1 is a perspective view showing a specific embodiment of the cuff of the digital finger blood pressure monitor according to the present invention.

The finger electronic blood pressure monitor is equipped with a display section, a power switch, and a start switch on the upper surface of the instrument body 5,
Inside, a battery section including a power supply battery, a pressure pump, a pressure sensor, and an electronic circuit section such as an MPU are built in (not shown). It is also connected to a pressurizing pump via a check valve.

When measuring blood pressure (see Fig. 2), after inserting the finger 4 into the finger insertion hole 11 of the cuff 1, light is emitted from the light emitting element 2 to the artery 41 of the finger while the cuff 1 is pressurized and the finger 4 is compressed. The reflected light is received by the light-receiving element 3, and a pulse wave signal that changes during the pressurization or depressurization process of the cuff 1 is detected. From this pulse wave data and cuff pressure data, a blood pressure value is determined and displayed on the display section.

The feature of this invention is that the pulse wave detectable range of the pulse wave sensor (receiving/emitting element) attached to the cuff 1 is expanded.

The cuff 1 is a cylindrical body in which an inner cylinder is fitted into an outer cylinder made of rubber, for example, and both ends of the fitted state are closed to form a hollow chamber 12 inside. An insertion hole 11 is provided. Further, this hollow chamber 12 is connected to a pressurizing pump of the instrument body 5 via a tube so as to be pressurized. Such a cuff 1 has a cylindrical cuff case 1.
3 is housed in the meter body 5.

The finger insertion hole 11 of the cuff 1, ie, the inner circumferential wall of the cylindrical body hole, is equipped with a pulse wave sensor consisting of a plurality of receiving and emitting elements.

In the embodiment shown in FIGS. 1 and 2, two light emitting elements 2, 2 and two light receiving elements 3, 3 are arranged alternately. In this arrangement, for example, a recess 14 is formed in the wall surface of the hollow chamber 12, and the receiving and emitting elements 2 and 3 are housed in the recess 14, respectively.
The protruding surface of the receiving/emitting element is aligned with the wall surface of the cuff inner hole.

The arrangement of the receiving/emitting elements 2 and 3 is such that they are arranged approximately at the corresponding portion where the finger artery 41 is expected to be located on average when the finger is properly inserted into the finger insertion hole 11. has been done.

FIG. 3 shows another example of the arrangement of the receiving and emitting elements.

In this embodiment, two light receiving elements 3, 3 are arranged on both sides of a single light emitting element 2 at the center. In this case as well, the range in which pulse waves can be detected is greatly expanded compared to when a pair of single receiving/emitting elements 2 and 3 are arranged close to each other.

In the cuff of an electronic finger blood pressure monitor having such a configuration, as shown in FIGS. range) has been significantly expanded. Therefore, if your finger is now tilted in either direction,
In other words, if the finger is inserted into the finger insertion hole 11 at a certain angle, the artery running inside the finger will also be misaligned with respect to the receiving/emitting element. However, in the present invention, the two light-receiving elements 3, 3 and the two light-emitting elements 2, 2 are arranged alternately to expand the range in which pulse waves can be detected. The pulse wave is within the wave detection range and an appropriate pulse wave is detected.

(F) Effects of the invention As described above, in this invention, a plurality of receiving and emitting elements are arranged close to each other on the peripheral wall of the finger insertion hole of the cuff to expand the range in which pulse waves can be detected.

According to this invention, even if the finger is inserted at an angle into the finger insertion hole and the finger artery deviates by a certain angle from the originally planned position, it will deviate from the pulse wave detectable range of the receiving/emitting element. There's nothing to do. Therefore, there is no need to use extra nerves when inserting a finger, as in the past, so that the artery corresponds to the pulse wave sensor, and an accurate pulse wave is always detected regardless of the angle at which the finger is inserted. It has excellent effects such as being able to simplify the structure and achieve the purpose of the invention.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the cuff of the digital finger blood pressure monitor according to this invention, Fig. 2 is a sectional view of the cuff, and Fig. 3 is a sectional view of the cuff.
The figure is a sectional view showing another embodiment, FIG. 4 is a sectional view showing the pulse wave detectable range of the pulse wave sensor, and FIG. 5 is an explanatory diagram showing an enlarged main part of FIG. 4. ,
FIG. 6 is a sectional view showing a conventional example, FIG. 7 is a waveform diagram of a detected pulse wave, FIG. 8 is a sectional view of a conventional example illustrating a state in which a finger is improperly inserted, and FIG. 9 is a waveform diagram of a detected pulse wave in the same improper insertion state. 1: Cuff, 2: Light emitting element, 3: Light receiving element, 4
1: Digital artery.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A finger pressure type electronic blood pressure monitor in which a light-receiving element and a light-emitting element for detecting pulse waves are provided close to each other on the circumferential wall of the finger insertion hole of a cylindrical cuff, A cuff for an electronic finger blood pressure monitor, characterized in that a plurality of at least one of the light receiving and light emitting elements is provided to expand the range in which pulse waves can be detected. (2) The cuff for an electronic finger blood pressure monitor according to claim 1, wherein a plurality of light receiving elements are arranged in a distributed manner on both sides of the single light emitting element. (3) The cuff for an electronic finger blood pressure monitor according to claim 1, which is a registered utility model, in which the receiving/emitting elements are arranged in two pairs, and the receiving/emitting elements are alternately arranged adjacent to each other.