JP2011224144A - Wrist type hemadynamometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and, especially, thin and precise wrist type hemadynamometer.SOLUTION: The wrist type hemadynamometer applies locally pressurizes a radial artery or substantially right above an arteria ulnaris, to detect a pressure variation of the vascular wall, and calculates a blood pressure from an oscillometric waveform. The wrist type hemadynamometer includes: a base plate 28; a cylindrical cam structure 26 that is provided on the base plate 28 and that locally pressurizes the radial artery or substantially right above the arteria ulnaris; a pressure sensor 32 that is provided at an end of the cylindrical cam structure 26 and that detects the pressure variation of the vascular wall; a drive means 18 that drives the cylindrical cam structure 26; and drive deceleration means 22, 24 that decelerate the rotation of the drive means 18 and transmit the rotation to the cylindrical cam structure 26.

Description

  The present invention relates to a wrist blood pressure monitor.

  In recent years, sphygmomanometers that can easily measure biometric information have become widespread in general households due to increased health awareness. In terms of national finance, it is in a state of financial failure due to an increase in the number of elderly people, heart disease, strokes, and other patients with sequelae, and as a national policy, it is necessary to promote public health. It is said that there are a very large number of potential patients with lifestyle-related diseases (10 million people in Japan) and there are about 39 million potential patients with hypertension (Japan). There is no doubt that measures for these lifestyle-related diseases are effective in reducing medical expenses, and immediate measures are desired.

  A conventional wrist sphygmomanometer uses an air cuff for pressurization and pressurizes all or part of the wrist to obtain a blood pressure value. For example, in a wrist type sphygmomanometer, in order to realize that the measurement site is pushed deeper in the area of the air cuff that is in contact with the soft part of the measurement part than the area of the air cuff that is in contact with the hard part of the measurement part. There has been proposed a cuff having a low-hardness compression sheet portion and a high-hardness compression sheet portion and formed in an accordion shape so that the low-hardness portion bites into the living body (see, for example, Patent Document 1).

  Also, in the wrist sphygmomanometer, in which the air cuff is wound around the wrist and compressed, the air cuff does not compress the ulnar artery, but only the radial artery, starting from a hard tissue area such as a tendon, An air cuff having a length that passes through the radial artery and does not reach the ulnar artery when wound on the radial side has been proposed (see, for example, Patent Document 2).

JP 2004-350786 A JP 2000-350706 A

  However, in Patent Document 1, pressure is applied locally to reduce the size of the device. However, the air cuff itself is large, an air pump is used, an air pump pipe connecting it, and the like. It is difficult to reduce the size.

  Further, in Patent Document 2, it is configured to pressurize locally and calculate an accurate blood pressure value, but it is difficult to reduce the size as in Patent Document 1.

  In this way, the conventional configuration places the air cuff all around the wrist or more than half of the wrist, and pressurizes the entire wrist, radial artery, or ulnar artery, thereby pressurizing the local part and blood pressure value. I was looking for. In this configuration, a large air cuff is required, and an air pump for pressurization, a release valve with a solenoid for pressure reduction, and the like are required, and it is extremely difficult to reduce the size of the apparatus. In wrist sphygmomanometers, air cuff inflation is inhibited by the presence of the radius and long palmar tendon, and the radial artery is pressurized, and the ulnar artery is pressurized by the presence of the ulna, superficial digital flexor, and ulnar carpal tendon. Is difficult.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A wrist sphygmomanometer that locally pressurizes the radial artery or the ulnar artery locally, detects pressure fluctuations in the blood vessel wall, and calculates a blood pressure value from the oscillometric waveform, A base plate, a cylindrical cam mechanism that is provided on the base plate and locally pressurizes the radial artery or the ulnar artery locally, and a pressure fluctuation of the blood vessel wall that is provided on a distal end side of the cylindrical cam mechanism. A wrist type sphygmomanometer, comprising: a pressure sensor for detecting the pressure; a driving means for driving the cylindrical cam mechanism; and a driving speed reducing means for decelerating the rotation of the driving means and transmitting it to the cylindrical cam mechanism. .

  According to this, an oscillometric waveform for blood pressure measurement is obtained with respect to an air cuff, an air pump, or a conventional air cuff type wrist sphygmomanometer having an air pump piping from the air pump to the air cuff. By using a driving means, a driving speed reduction means, and a cylindrical cam mechanism for the pressure mechanism, it is possible to reduce the size very much. Since it can be made particularly thin, it is usual to wear a wrist sphygmomanometer at the time of measurement, but the wrist sphygmomanometer of the present invention is a wrist type that is always worn like a wristwatch. It is possible to configure a sphygmomanometer, and it is possible to provide a wrist sphygmomanometer that continuously measures 24 hours (for example, every 30 minutes) against masked hypertension, early morning hypertension, white coat hypertension, nocturnal hypertension, etc., which have become a problem in recent years. .

  Further, in a wrist type sphygmomanometer, an accurate blood pressure can be obtained by locally pressurizing approximately directly above the radial artery or approximately directly above the ulnar artery using mainly a cylindrical cam mechanism instead of a conventional pressurizing mechanism using an air cuff. A wrist sphygmomanometer can be provided for the value.

  The inventor has confirmed that there is a difference between the blood pressure value calculated by the oscillometric waveform obtained by the pressure value change in the air cuff of a commercially available wrist type sphygmomanometer and the blood pressure value obtained by the upper arm. . This is because when a wrist sphygmomanometer is composed of a large member such as an air cuff, it is difficult to directly measure the balance between the pressure value of the outer wall of the blood vessel and the pressure of the air cuff due to the presence of ribs, ulna and various tendons. This is because. Therefore, in a wrist type sphygmomanometer, it is necessary to apply a certain correction to the measured value.

  Application Example 2 The wrist type sphygmomanometer as described above, wherein the cylindrical cam mechanism is configured in a plurality of stages.

  According to this, a thinner wrist type sphygmomanometer can be provided by providing a plurality of stages of the cylindrical cam mechanism.

  Application Example 3 The wrist type sphygmomanometer, wherein the driving means is an electromagnetic actuator.

  According to this, a wrist type sphygmomanometer that is inexpensive and has good controllability can be provided by using an electromagnetic actuator as the driving means.

  Application Example 4 The wrist type sphygmomanometer, wherein the driving means is an ultrasonic actuator.

  According to this, by using an ultrasonic actuator for the driving means, a thin-type wrist sphygmomanometer with good controllability can be provided.

  Application Example 5 In the wrist type sphygmomanometer, the drive speed reduction unit includes a worm gear and a worm gear wheel.

  According to this, by using the worm gear and the worm gear wheel as the drive speed reduction means, the amount of movement of the cylindrical cam mechanism per time in the pressurizing direction can be reduced, and an accurate oscillometric waveform can be obtained.

  Application Example 6 The wrist type sphygmomanometer according to the above-described wrist type sphygmomanometer, wherein the drive speed reducing unit includes a strange planetary gear.

  According to this, a thin wrist type sphygmomanometer can be provided by using a mysterious planetary gear as the drive speed reduction means.

  Application Example 7 In the wrist type sphygmomanometer, the pressure sensor includes a sensor water bag.

  According to this, since the pressure sensor is composed of the water bag for the sensor, the vibration can be transmitted to the pressure detection element without attenuating the vibration of the pulse as compared with the sensor by the air cuff. Accurate blood pressure measurement can be performed.

  Application Example 8 In the wrist blood pressure monitor, the shape of the base plate includes a plurality of surfaces including a first surface and a second surface along the wrist. Total.

  According to this, the shape of the base plate constituting the wrist type sphygmomanometer is composed of the first surface and the second surface along the circumference of the wrist, so that it fits along the wrist and has a feeling of wearing. Improvement and the difference between the wrist and the wrist sphygmomanometer during measurement are less likely to occur, and accurate blood pressure measurement can be performed.

  Application Example 9 In the wrist sphygmomanometer, the angle between the first surface and the second surface can be set to a predetermined value.

  According to this, the angle between the first surface and the second surface can be set to a predetermined value, so that it is possible to cope with a person with a thin arm and adjust the feeling of wearing for each person. A comfortable wrist sphygmomanometer can be provided.

  Application Example 10 In the wrist type sphygmomanometer, the drive unit is arranged in the vicinity of an intersection line between the first surface and the second surface along the wrist. Sphygmomanometer.

  According to this, since the drive means is arranged in the vicinity of the intersection line between the first surface and the second surface, the speed reduction configuration of the drive means can be facilitated, and the apparatus becomes compact.

  Application Example 11 In the wrist type sphygmomanometer, the first surface includes the cylindrical cam mechanism, and the second surface includes a circuit board. Sphygmomanometer.

  According to this, since the cylindrical cam mechanism is configured on the first surface and the circuit board is configured on the second surface, a useless space is eliminated and a small wrist blood pressure monitor can be provided.

The perspective view which shows the whole wrist-type blood pressure meter which concerns on this embodiment. The perspective view which shows the internal structure of the wrist-type blood pressure meter which concerns on this embodiment. The figure which shows the state which the cylindrical cam mechanism which concerns on this embodiment protruded. Sectional drawing which shows the state with which the wrist type blood pressure meter which concerns on this embodiment was mounted | worn with the rib of the wrist. The figure which shows the blood pressure measurement result actually acquired with the structure which concerns on this embodiment. The figure which shows the state which put the wrist type blood pressure meter which concerns on this embodiment on the arm. The figure which shows the cross section of the conventional general wrist type | mold blood pressure meter. The perspective view which shows the cylindrical cam mechanism which concerns on this embodiment. The figure which shows the worm gear and worm gear wheel which concern on this embodiment. The figure which shows the base board which concerns on this embodiment. The figure which shows sectional drawing of the wrist type blood pressure meter which concerns on this embodiment. The figure which shows the pressure sensor which concerns on this embodiment. The figure which shows the wrist-type blood pressure meter which concerns on this modification. The perspective view which shows the mysterious planetary gear which concerns on this modification.

Hereinafter, the present embodiment will be described with reference to the drawings. Note that the drawings to be used are appropriately enlarged or reduced so that the part to be described can be recognized.
FIG. 1 is a perspective view showing the entire wrist blood pressure monitor according to the present embodiment. The wrist sphygmomanometer 2 according to the present embodiment includes an exterior cover 10 as shown in FIG. A liquid crystal display panel 12 is attached to the exterior cover 10 so that the measured blood pressure value can be displayed and can be usually worn on a wristwatch-like.

  FIG. 2 is a perspective view showing the internal structure of the wrist sphygmomanometer 2 according to the present embodiment. FIG. 2A is a perspective view from the liquid crystal display panel 12 side, and FIG. 2B is a perspective view from the opposite side to the liquid crystal display panel 12. The exterior cover 10 is omitted so that the inside can be seen. The wrist sphygmomanometer 2 according to the present embodiment includes a base plate 28, a secondary battery 14, a control circuit (not shown), a control circuit board (circuit board) 16, an electromagnetic motor (electromagnetic actuator) 18 as a driving means, A transmission gear 20, a worm gear (drive speed reduction means) 22, a worm gear wheel (drive speed reduction means) (included in the cylindrical cam mechanism 26) 24, a cylindrical cam mechanism 26, a pressure plate 30, and a sensor water bag (pressure sensor) 32 are provided. ing.

  FIG. 3 is a view showing a state in which the cylindrical cam mechanism 26 according to the present embodiment protrudes. The pressure plate 30 and the sensor water bag 32 are omitted. The cylindrical cam mechanism 26 according to the present embodiment is provided on the base plate 28 and locally pressurizes the radial artery B or the ulnar artery F almost directly above. The cylindrical cam mechanism 26 is configured in a plurality of stages. Thereby, a thinner wrist type sphygmomanometer 2 can be provided.

  When the electromagnetic motor 18 receives electric power from the secondary battery 14 and rotates, the transmission gear 20 rotates, and the worm gear 22 configured coaxially with the transmission gear 20 rotates. As the worm gear wheel 24 rotates, the cylindrical cam mechanism 26 protrudes as shown in FIG. Thereby, the cylindrical cam mechanism 26 pushes out the pressurizing plate 30 and the water bag 32 for the sensor, and pressurizes from right above the rib C of the wrist A. In addition, by using the electromagnetic motor 18 as the driving means, it is possible to provide the wrist type sphygmomanometer 2 which is inexpensive and has good controllability.

Next, a mechanism for measuring the blood pressure by pressurizing the radial artery B will be described.
FIG. 4 is a cross-sectional view showing a state in which the wrist sphygmomanometer 2 according to the present embodiment is attached to the rib C of the wrist A. The exterior cover 10 is omitted so that the inside can be seen. The pressurizing plate 30 and the sensor water bag 32 according to the present embodiment are pushed out by the cylindrical cam mechanism 26, and pressurize the radial artery B on the side of the wrist A where the tendon D exists from substantially right above. By this pressurization, the radial artery B is crushed and occluded. Although the pressure to close differs depending on the person, it needs about 200 to 250 mmHg. Thereafter, the closed state of the radial artery B is released by gradually reducing the pressure of the radial artery B by slowly rotating the electromagnetic motor 18 backward. Then, when the internal pressure of the radial artery B and the pressurizing pressure become substantially equal, the outer wall of the radial artery B becomes more compliant, and the blockage and release are repeated intensely every pulse. A blood pressure value is calculated from an oscillometric waveform obtained by continuously monitoring this.

  According to the inventors' evaluation, the conventional air cuff-type wrist sphygmomanometer 100 (see FIG. 7) is directly connected with the presence of the rib C, the ulna E, and the tendon D in order to pressurize the entire wrist A. It is difficult to pressurize the radial artery B, and the pressure of the radial artery B outer wall and the pressure in the air cuff are not balanced. That is, because the pressure in the air cuff increases due to the deformation of the tendon D or the living body, there is a possibility that it differs from the actual blood pressure value. However, in the present embodiment, the radial artery B is pressurized without being obstructed by the rib C and tendon D by locally pressurizing the area directly above the rib C, so that the pressure in the sensor water bag 32 and the radial artery B are increased. Since the pressure can be balanced, an accurate blood pressure value can be obtained.

  FIG. 5 is a diagram showing blood pressure measurement results actually obtained with the configuration according to the present embodiment. FIG. 5A shows the result of extracting and amplifying the measured value (DC value) of the sensor pressure value in the sensor water bag 32 and the pulsation component (AC value) superimposed on the measured value. FIG. 5B is obtained by differentiating the envelope waveform connecting the vertices of the AC waveform in FIG. By the cylindrical cam mechanism 26 according to the present embodiment, the pressure plate 30 is pressed against the wrist A at a constant speed, and the pressure in the sensor water bag 32 increases. When the pressure value is sufficiently higher than the systolic blood pressure of the measurer (in this embodiment, about 230 mmHg), the cylindrical cam mechanism 26 is contracted at a predetermined speed to thereby reduce a predetermined pressure reduction speed (3 in this embodiment). The pressure is reduced to about 4 mmHg. At that time, the pulsation vibration of the blood vessel of the measurer is superimposed on the pressure fluctuation in the sensor water bag 32. The AC waveform shown in FIG. 5A is obtained by extracting only the AC component. It can be seen that a clear oscillometric waveform is also observed in this embodiment.

  In general, the differential method defines the pressure value as the highest blood pressure and the lowest blood pressure when the change rate of the envelope waveform connecting the vertices of the oscillometric waveform is the largest. Accordingly, the DC value at the plus side apex in FIG. 5B can be obtained as the maximum blood pressure value, and the DC value at the minus side apex can be obtained as the minimum blood pressure value. It has been confirmed by the inventors' evaluation that an accurate blood pressure can be measured with the wrist sphygmomanometer 2 shown in the present embodiment.

  In this embodiment, the blood pressure value is calculated by the differential method, but it goes without saying that the blood pressure value is calculated by another algorithm.

  FIG. 6 is a view showing a state in which the wrist sphygmomanometer 2 according to the present embodiment is worn on the arm. It can be seen that the wrist sphygmomanometer 2 is very compact compared to the conventional air cuff type wrist sphygmomanometer 100 (see FIG. 7).

  FIG. 7 is a view showing a cross section of a conventional general wrist blood pressure monitor. A conventional air cuff wrist sphygmomanometer 100 is configured to cover the sphygmomanometer main body 102 and the entire circumference of the wrist A with an air bag called an air cuff 104. By tightening the entire wrist A, the radial artery B and the ulnar artery F are simultaneously tightened to occlude the blood vessel, and the blood pressure value is determined by monitoring the oscillometric waveform at the time of release. In addition, a method in which only the radial artery B and only the ulnar artery F are pressurized has been proposed, and the blood pressure values are similarly determined by performing local pressure. There are an air cuff 104 that covers the entire wrist A, an air pump 106 that sends air to pressurize the air cuff 104, an electromagnetic motor (not shown), and an air pump pipe 110 that connects them.

Next, the configuration of the cylindrical cam mechanism 26 will be described in detail.
FIG. 8 is a perspective view showing the cylindrical cam mechanism 26 according to the present embodiment. In the drawing, a cylindrical cam mechanism (an exploded development view) 26, a base plate 28, a pressure plate 30, and a sensor water bag 32 are shown. The cylindrical cam mechanism 26 according to the present embodiment includes a first movable ring 36 having a worm gear wheel 24 formed on the outer periphery, a first fixed ring 38 on the inner side, a second movable ring 40 on the inner side, and an inner side thereof. The third movable ring 42 moves integrally with the second movable ring 40, the second fixed ring 44 on the inner side, and the fourth fixed ring 46 on the inner side.

  The first fixed ring 38 is formed with a first fixed ring spiral groove 48, the second movable ring 40 is formed with a second movable ring protrusion 50, and the first movable ring 36 has a A first movable ring longitudinal groove 52 is formed. Similarly, the third movable ring 42 is provided with a third movable ring spiral groove 54, the second fixed ring 44 is provided with a second fixed ring longitudinal groove 56, and the fourth fixed ring 46 is provided with a fourth fixed ring protrusion 58. It has been. The first fixed ring 38 is fixed to the base plate 28, and the first movable ring 36 slides around the first fixed ring 38 and is held rotatably. The second movable ring 40 and the third movable ring 42 are integrally formed by adhesion or the like, and are held rotatably on the inner sliding surface of the first fixed ring 38. The second fixed ring 44 is rotatably held on the inner sliding surface of the third movable ring 42. Further, the fourth fixing ring 46 is also rotatably held on the inner sliding surface of the second fixing ring 44.

  Further, the second movable ring protrusion 50 penetrates the first fixed ring spiral groove 48 and engages with the first movable ring longitudinal groove 52 so as to be slidable in the longitudinal direction. The fourth fixed ring protrusion 58 also passes through the second fixed ring longitudinal groove 56 and slidably engages with the third movable ring spiral groove 54.

  Next, the operation of the cylindrical cam mechanism 26 will be described. First, in the worm gear 22, the first movable ring 36 having the worm gear wheel 24 formed on the outer periphery is rotationally driven with the base plate 28 serving as a sliding surface. As the first movable ring 36 rotates, the second movable ring protrusion 50 and the first movable ring longitudinal groove 52 are engaged with each other. Therefore, the second movable ring 40 is aligned with the first fixed ring spiral groove 48. Move down in the drawing. Further, since the fourth fixed ring protrusion 58 is engaged with the third movable ring spiral groove 54, the fourth movable ring protrusion 58 receives a driving force as the third movable ring 42 rotates. Since the second fixing ring 44 is held in a non-rotatable manner by the first fixing ring 38 and the second fixing ring protrusion 62, the fourth fixing ring 46 is driven by the third movable ring 42 rotating. By being received, in order to move along the second fixed ring longitudinal groove 56, it moves downward in the drawing. Since the fourth fixing ring 46, the pressure plate 30 and the sensor water bag 32 are integrated, the sensor water bag 32 can be pressed against the wrist A body with the base plate 28 as a fixing member, and the radial artery B. It is possible to measure the blood pressure value by pressurizing a portion just above.

  By using the two-stage cam mechanism (see FIG. 3) as in the present embodiment, the configuration of the cylindrical cam mechanism 26 having a thickness of 6 mm enables the movement of the 6 mm fourth fixing ring 46, while being extremely thin. Thus, it becomes possible to earn a large stroke amount and to measure the blood pressure value.

  Here, the stroke amount of the cylindrical cam mechanism 26 necessary will be described. In actual blood pressure measurement, it is necessary to pressurize the sensor water bag 32 until the radial artery B is completely occluded. In that case, the movement stroke of the water bag 32 for sensors is needed for the following reasons. One is the elastic deformation of the living body. Although it can be understood that the protrusions of the ribs C are actually pressed, the living body escapes by about 2 to 3 mm due to elastic deformation. In order to pressurize following this, a large stroke amount is required. Further, when the wrist sphygmomanometer 2 is constituted by a belt 34 such as a wristwatch, the belt 34 needs to have a clearance for loosening and maintaining a feeling of wearing. When the sensor water bag 32 is actually pressed and pressurized, a stroke amount sufficient to cancel the clearance is required. Actually, about 2 to 3 mm is required. Therefore, when they are combined, a stroke amount of about 4 to 6 mm is required. It is impossible to make it thin with other methods, and it is possible to achieve a thickness of 6 mm as a wrist sphygmomanometer 2 that is always worn, and a stroke of 6 mm or more is required to construct an accurate wrist sphygmomanometer 2. The inventors have found this configuration through numerous evaluations.

  As described above, according to the present embodiment, an accurate wrist sphygmomanometer 2 can be provided while being a thin sphygmomanometer 2 that can be always worn.

  FIG. 9 is a view showing the worm gear 22 and the worm gear wheel 24 according to the present embodiment. The worm gear 22 and the worm gear wheel 24 decelerate the rotation of the electromagnetic motor 18 and transmit it to the cylindrical cam mechanism 26. Thereby, the amount of movement of the cylindrical cam mechanism 26 in the pressurizing direction per time can be reduced, and an accurate oscillometric waveform can be obtained. In general, the worm gear wheel 24 can take a large deceleration of about 1/30 to 1/100 in one stage, and loses a thin merit when transmitting power to the cylindrical cam mechanism 26. It is possible to configure without. Therefore, by using the worm gear wheel 24 in this embodiment, the wrist type sphygmomanometer 2 that is thin and can be always worn can be provided.

  FIG. 10 is a view showing the base plate 28 according to the present embodiment. The shape of the base plate 28 is composed of a plurality of surfaces including a first plane (first surface) 68 and a second plane (second surface) 70 along the wrist A. The cross-sectional shape of the wrist A is substantially elliptical, and the wrist sphygmomanometer 2 with excellent wearing feeling can be provided by forming the base plate 28 from the first plane 68 and the second plane 70. In addition, since the first plane 68 and the second plane 70 are configured, even when the sensor water bag 32 is pressed by driving, the position is not easily displaced from the wrist A, and an accurate blood pressure value can be measured. Although the mounting surface with the wrist A can be shaped along the wrist A cross section, the control circuit board 16, the secondary battery 14, and the cylindrical cam mechanism 26 that are configured inside are preferably configured in a plane. In order to achieve the above, thinning is impaired. Or it becomes a high-cost structure. Therefore, the present embodiment is configured to achieve thinning, a feeling of wearing, and difficulty in shifting.

  The angle between the first plane 68 and the second plane 70 can be set to a predetermined value. By adopting a configuration in which the angle between the first plane 68 and the second plane 70 can be set (changed arbitrarily) to a predetermined value, it corresponds to a person with a thin arm and a feeling of wearing of an individual. By doing so, a comfortable wrist sphygmomanometer 2 that is comfortable to wear can be provided.

  The cylindrical cam mechanism 26 is configured on the first plane 68, and the control circuit board 16 is configured on the second plane 70. Thereby, the compact wrist type blood pressure monitor 2 can be provided.

  Further, the sensor water bag 32 is arranged so as to be almost directly above the radial artery B from the base plate 28, and in this state, is fixed like a watch by a belt 34 (see FIG. 4).

  FIG. 11 is a cross-sectional view of the wrist sphygmomanometer 2 according to the present embodiment. In the wrist sphygmomanometer 2 according to the present embodiment, the transmission gear 20 and the electromagnetic motor 18 are disposed in the vicinity of the intersection line between the first plane 68 and the second plane 70. In the case of meshing between spur gears, meshing between gears is established regardless of meshing in any normal direction as long as the pitch circle diameter does not change. Therefore, by arranging the transmission gear 20 at the intersection line between the first plane 68 and the second plane 70 and arranging the electromagnetic motor 18 in the vicinity thereof, there is little wasted space, the speed reduction configuration can be facilitated, and the apparatus is compact. It becomes.

  FIG. 12 is a diagram illustrating a pressure sensor according to the present embodiment. The pressure sensor includes a sensor water bag 32 and a pressure detection element 74 that detects pressure. The sensor water bag 32 and the pressure detecting element 74 are provided on the distal end side of the cylindrical cam mechanism 26 and detect pressure fluctuations in the radial artery B or the ulnar artery F wall. In the present embodiment, the pressure detection element 74 is disposed inside the pressurizing plate 30 so that the pressure value in the sensor water bag 32 can be detected. As a result, the vibration can be transmitted to the pressure detection element 74 without attenuating the vibration of the pulse as compared with the case where air is used for pressure detection, so that more accurate blood pressure measurement can be performed. .

  According to the present embodiment, in the so-called wrist sphygmomanometer 2, when configuring a locally pressurized sphygmomanometer that locally pressurizes without using a general air cuff, the cylindrical cam mechanism 26 that is a two-stage cylindrical cam is provided. By using the device, it is possible to obtain a pressurizing force necessary for blood pressure measurement while configuring the device to be ultra-thin. Thereby, it can reduce in size very much. In particular, the thickness can be reduced.

  Further, in the wrist sphygmomanometer 2, the cylindrical cam mechanism 26 is mainly used instead of the conventional pressurizing mechanism by the air cuff 104, and the local sphygmomanometer B or the ulnar artery F is locally applied locally. By applying pressure, the wrist sphygmomanometer 2 for obtaining an accurate blood pressure value can be provided.

(Modification)
FIG. 13 is a view showing a wrist type sphygmomanometer according to this modification. In the above-described embodiment, the configuration in which the worm gear 22 and the worm gear wheel 24 are used as the drive speed reduction means in order to decelerate the rotational drive of the cylindrical cam mechanism 26 has been illustrated. For example, as shown in FIG. The planetary gear 76 may be used as drive speed reduction means. The flat wonder planetary gear 76 is disposed on the cylindrical cam mechanism 26. The flat mysterious planetary gear 76 can secure deceleration to about 1/30 to 1/100 by itself, thereby providing a wrist type sphygmomanometer 4 having a simple configuration.

  Further, in this modification, in the above-described embodiment, the configuration using the electromagnetic motor 18 as the driving unit to rotate the cylindrical cam mechanism 26 is exemplified. However, for example, as shown in FIG. The ultrasonic motor 78 which is the above may be used as the driving means. Thereby, the thin-type wrist-type blood pressure monitor 4 with good controllability can be provided.

  FIG. 14 is a perspective view showing a mysterious planetary gear 76 according to this modification. FIG. 14A is a perspective view from the liquid crystal display panel 12 side, and FIG. 14B is a perspective view from the opposite side to the liquid crystal display panel 12. The operation will be described in detail using FIGS. 14A and 14B. The ultrasonic motor 78 generates minute vibrations by applying a voltage such as a rectangular wave, and rotates the drive disk 80. The drive disk 80, the sun gear A82, and the sun gear B84 are integrally formed, and rotate by the rotation of the drive disk 80, respectively. The sun gear A82 and the planetary gear A86, and the sun gear B84 and the planetary gear B88 are engaged with each other. Further, the planetary gear A86 and the planetary gear B88 are integrally formed, and there are a plurality of them (three in this embodiment) around the sun gear, and rotate and revolve while meshing around the sun gear. Since the internal gear A90 is fixed, when the sun gear A82 rotates, the planetary gear A86 revolves while rotating around the sun gear A82. As the planetary gear A86 rotates and rotates, the planetary gear B88 integrated with the planetary gear A86 similarly revolves around the sun gear B84. By rotating the planetary gear B88, the internal gear B92 rotates. Further, since the drive projection 96 on the internal gear B92 is engaged with the driven hole 98 of the power transmission member 94, the second movable ring is interposed via the power transmission member 94 when the internal gear B92 rotates. Power is transmitted to 40 and the second movable ring 40 rotates. By determining the number of teeth of the sun gear A82, the sun gear B84, the planetary gear A86, the planetary gear B88, the internal gear A90, and the internal gear B92 while satisfying predetermined conditions, the drive disk 80 on the input side The rotation of the internal gear B92 on the output side can be reduced to about 1/100 to 1/300. The configuration in which the second movable ring 40 is pressurized by rotating is exactly the same as the embodiment described in FIG.

  According to this modification, it is possible to configure a small and thin wrist blood pressure monitor 4 by using the ultrasonic motor 78 as the driving means. Further, by using the mysterious planetary gear 76, it is possible to realize a large speed reduction and to configure a small and thin wrist type sphygmomanometer 4.

  DESCRIPTION OF SYMBOLS 2, 4 ... Wrist-type blood pressure monitor 10 ... Exterior cover 12 ... Liquid crystal display board 14 ... Secondary battery 16 ... Control circuit board (circuit board) 18 ... Electromagnetic motor (drive means) 20 ... Transmission gear 22 ... Worm gear (drive reduction means) 24 ... Worm gear wheel (drive reduction means) 26 ... Cylinder cam mechanism 28 ... Base plate 30 ... Pressure plate 32 ... Water bag for sensor (pressure sensor) 34 ... Belt 36 ... First movable ring 38 ... First fixed ring 40 ... First 2 movable ring 42 ... 3rd movable ring 44 ... 2nd fixed ring 46 ... 4th fixed ring 48 ... 1st fixed ring spiral groove 50 ... 2nd movable ring protrusion 52 ... 1st movable ring vertical groove 54 ... 3rd movable ring Spiral groove 56 ... second fixing ring longitudinal groove 58 ... fourth fixing ring protrusion 62 ... second fixing ring protrusion 68 ... first plane 70 ... second plane 74 ... Pressure detection element (pressure sensor) 76 ... Mysterious planetary gear (drive speed reduction means) 78 ... Ultrasonic motor (drive means) 80 ... Drive disk 82 ... Sun gear A 84 ... Sun gear B 86 ... Planetary gear A 88 ... Planet Gear B 90 ... Internal gear A 92 ... Internal gear B 94 ... Power transmission member 96 ... Drive projection 98 ... Driven hole 100 ... Wrist blood pressure monitor 102 ... Blood pressure monitor main body 104 ... Air cuff 106 ... Air pump 110 ... Air pump piping A ... wrist B ... radial artery C ... radius D ... tendon E ... ulna F ... ulnar artery.

Claims (11)

A wrist sphygmomanometer that locally pressurizes the radial artery or the ulnar artery locally, detects pressure fluctuations in the blood vessel wall, and calculates a blood pressure value from the oscillometric waveform,
A base plate,
A cylindrical cam mechanism that is provided on the base plate and locally pressurizes the radial artery or the ulnar artery substantially directly above;
A pressure sensor that is provided on a distal end side of the cylindrical cam mechanism and detects pressure fluctuation of the blood vessel wall;
Drive means for driving the cylindrical cam mechanism;
Drive deceleration means for decelerating the rotation of the drive means and transmitting it to the cylindrical cam mechanism;
Wrist blood pressure monitor characterized by including. The wrist sphygmomanometer according to claim 1,
The wrist sphygmomanometer, wherein the cylindrical cam mechanism is configured in a plurality of stages. The wrist sphygmomanometer according to claim 1,
The wrist sphygmomanometer, wherein the driving means is an electromagnetic actuator. The wrist sphygmomanometer according to claim 1,
The wrist sphygmomanometer, wherein the driving means is an ultrasonic actuator. The wrist sphygmomanometer according to claim 1,
The wrist type sphygmomanometer, wherein the drive speed reducing means includes a worm gear and a worm gear wheel. The wrist sphygmomanometer according to claim 1,
The wrist type sphygmomanometer, wherein the drive speed reducing means includes a mysterious planetary gear. The wrist sphygmomanometer according to claim 1,
The wrist type sphygmomanometer, wherein the pressure sensor includes a water bag for the sensor. The wrist sphygmomanometer according to claim 1,
The wrist sphygmomanometer is characterized in that the shape of the base plate is composed of a plurality of surfaces including a first surface and a second surface along the wrist. The wrist sphygmomanometer according to claim 8,
The wrist sphygmomanometer, wherein an angle between the first surface and the second surface can be set to a predetermined value. The wrist sphygmomanometer according to claim 8,
The wrist sphygmomanometer is characterized in that the driving means is disposed in the vicinity of an intersection line between the first surface and the second surface along the wrist. The wrist sphygmomanometer according to claim 10,
The wrist sphygmomanometer, wherein the cylindrical cam mechanism is configured on the first surface, and a circuit board is configured on the second surface.