US20050203426A1 - Contact type pulse measurement device - Google Patents
Contact type pulse measurement device Download PDFInfo
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- US20050203426A1 US20050203426A1 US10/799,729 US79972904A US2005203426A1 US 20050203426 A1 US20050203426 A1 US 20050203426A1 US 79972904 A US79972904 A US 79972904A US 2005203426 A1 US2005203426 A1 US 2005203426A1
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- United States
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- measurement device
- signal
- pulse measurement
- bio
- active sensor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02444—Details of sensor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/0245—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H2230/00—Measuring physical parameters of the user
- A61H2230/04—Heartbeat characteristics, e.g. E.G.C., blood pressure modulation
- A61H2230/06—Heartbeat rate
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B22/00—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements
- A63B22/02—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with movable endless bands, e.g. treadmills
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B69/00—Training appliances or apparatus for special sports
- A63B69/16—Training appliances or apparatus for special sports for cycling, i.e. arrangements on or for real bicycles
Definitions
- the present invention relates to a contact type pulse measurement device, more particularly to a contact type pulse measurement device installed in handheld equipment for measuring the pulse of a user when the user holds such device by a hand.
- a device such as a clamp or a bracelet is generally used to be fixed onto the exerciser's body.
- the device using a clamp or a bracelet is movable and thus the electric wire may be exposed partially. The device will be moved and the electric wire will be shaken or twisted when the exerciser is doing exercises.
- the displacement of the device and the interference of the conductive wire according to the foregoing phenomenon directly affect the computation for measuring the heartbeat rate with respect to the microprocessor of the system, so that the measured value of the heartbeat rate may be inaccurate and results in a large error.
- the conductive wire also affects the direction or is in the way of the of the exerciser's movement.
- a bio-potential signal is used for the pulse measurement by directly putting an electrode sensor of the fitness equipment in contact with the human body, so that the conductive wire will not vibrate and thus overcoming the shortcoming of causing interferences. Since the current bio-potential signal measuring device (as shown in FIG. 1 ) requires two electrode sensors, which are a pair of corresponding sets including a first active sensor electrode 10 a with a first common point sensor electrode 10 b and a second active sensor electrode 10 d with a second common point sensor electrode 10 c (wherein the foregoing first common point sensor electrode 10 b and the second common point sensor electrode 10 c are connected together to form the same potential).
- the two sets of electrode sensors are connected to a pulse measurement device 10 by a conductive wire 101 , 102 , 103 , 104 , and the pulse measurement device 10 comprises a bio-potential detector 11 connected to the foregoing two sets of electrode sensors, a bio-signal measurement 12 for receiving the signal transmitted from the bio-potential sensor 11 , an analog filter/amplifier for receiving the signal transmitted from the bio-signal measurement 12 , and an associative processing unit 14 for receiving the signal processed by the analog filter/amplifier unit 13 for the processing or comparison of related settings, a signal processing unit 15 for processing the signal and displaying a pulse data on a display device 17 and also feeding back the signal to the associative processing unit 14 for the interactive processing. Further, the associative processing unit 14 can be connected to an external input device 16 for entering data or related settings.
- each of the two sets of electrode sensors at the gripping positions of the left and right hands should have a first active sensor electrode 10 a and a first common point sensor electrode 10 b (a second active sensor electrode 10 d and a second common point sensor electrode 10 c ).
- a user has to hold the first active sensor electrode 10 a and the first common point sensor electrode 10 b with one hand and the second active sensor electrode 10 d and the second common point sensor electrode 10 c with the other hand for its use, so that the user's bio-potential is detected by the first active sensor electrode 10 a and the first common point sensor electrode 10 b (or the second active sensor electrode 10 d and the second common point sensor electrode 10 c ) through the user's hand.
- a hand is holding the first active sensor electrode 10 a and the first common point sensor electrode 10 b (or the second active sensor electrode 10 d and the second common point sensor electrode 10 c ), and it will reduce the contact area of the electrode sensor and affect the reliability of receiving the signals.
- the user when a user is doing exercise, the user may have small hands or wants to change gestures or is afraid of not able to grip the first active sensor electrode 10 a and the first common point sensor electrode 10 b (or the second active electrode sensor 10 d and the second common point sensor 10 c ) at the same time, it will affect the measured value of the pulse.
- the primary objective of the present invention is to provide a solution to overcome the foregoing shortcomings and avoid the existing deficiency by providing a contact type of pulse measurement in accordance with the present invention.
- the present invention aims at the present shortcoming of the prior-art electrode sensors that requires users to hold a first active sensor electrode and a common point sensor electrode (or a second active sensor electrode and a second common point sensor electrode) to develop a contact pulse measurement device of the present invention that only requires one hand to grip an electrode sensor. As long as the electrode sensor fits the shape of the installed equipment, it will provide a larger contact area for gripping, and users can freely make adjustments to their gestures.
- the contact type pulse measurement device of the present invention is a pulse measurement device installed onto various kinds of handheld equipments, so that users can detect the pulse condition by holding the device which comprises a first active sensor electrode and a second sensor electrode having opposite polarities with each other, and the two active sensor electrodes respectively connected to the pulse measurement device by conductive wires, and the pulse measurement device comprises a bio-potential sensor connected to the foregoing two electrode sensors, a bio-signal measurement for receiving the signal transmitted from the foregoing bio-potential sensor, and the bio-signal measurement is connected to a negative feedback difference common mode signal and a buffer/balance circuit, and the buffer/balance circuit feeds back the signal to the signal measuring device, and the foregoing two sets of units provide a circuit with a common point electrode potential such that the negative feedback difference common mode signal and the buffer/balance circuit provide a circuit with a self common point electrode potential.
- the first bio-potential signal can be detected by means of the first active sensor electrode and the common point electrode.
- a second bio-potential signal having the same magnitude but a different phase as the first bio-potential signal can be detected by the second active sensor electrode and the common point electrode.
- FIG. 1 is a circuit block diagram according to a prior art.
- FIG. 2 is a circuit block diagram according to the present invention.
- FIG. 3 is a view of the treadmill according to the present invention when it is in use.
- FIG. 4 is a view of the fitness bicycle according to the present invention.
- a contact type pulse measurement device is a pulse measurement device installed to all kinds of handheld equipments, so that a user can grip the pulse measurement device to measure the pulse condition; wherein the contact pulse measurement device of the invention comprises a first active sensor electrode 20 a and a second active sensor electrode 20 b having opposite polarities with each other, and the two active sensor electrodes 20 a , 20 b are connected to a pulse measurement device 20 respectively by conductive wires 201 , 202 .
- the pulse measurement device 20 of the present invention comprises a bio-potential sensor 21 for connecting the foregoing two active sensor electrodes 20 a , 20 b to detect a bio-potential of human body from user's hands in contact with the first active sensor electrode 20 a and the second active sensor electrode 20 b ; a bio-signal measurement 22 for measuring the signal transmitted from the bio-potential measuring device 21 ; a negative feedback difference common mode signal 221 and a buffer/balanced circuit 222 being connected to the bio-signal measurement 22 for feeding back a signal to the bio-signal measurement 22 and thus providing a circuit with a self common point electrode potential.
- the present invention makes use of a negative feedback difference common mode signal 221 and a buffer/balanced circuit 222 to provide a circuit with a self common point electrode potential to cope with the first active sensor electrode 20 a and the second active sensor electrode 20 b .
- the pulse measurement device 20 of the invention measures the biological signal, it only requires one electrode sensor at the contact position of both hands.
- the bio-potential sensor 21 is connected to a ESD (Electro-Static Discharges) protection circuits 211 for protecting the pulse measurement device 20 from being damaged by the surge of external voltage.
- ESD Electro-Static Discharges
- an analog filter/amplifier unit 23 for receiving signals transmitted from the foregoing bio-signal measurement 22 is used to filter and amplify the signal amplitude of within the electro-cardio frequency of the measured signal and facilitate the application later.
- An associative processing unit 24 receives the signal filtered and amplified by the foregoing analog filter/amplifier unit 23 to the process or compare parameter settings.
- a signal processing unit 25 will display a processed signal (such as a heart rate count or a comparison of standard heart rate value) on a display device 27 and shows the user's heart rate data or related information.
- the signal processing unit 25 also feeds the signal parameter back to the foregoing associative processing unit 24 for the setup of the system parameters.
- an associative processing unit 24 is connected to an input device 26 , so that users can enter external data or related parameter settings to the associative processing unit 24 .
- a display device 27 can be detached from the pulse measurement device 20 and integrated with a screen display of the system in which the pulse measurement device 20 is installed.
- the pulse measurement device 20 of the present invention mainly uses a negative feedback difference common mode signal 221 and a buffer/balanced circuit 222 to provide a circuit with a self common point electrode potential. Therefore, the user's bio-potential signals can be detected by the first active sensor electrode 20 a and the common point electrode. In the meantime, another bio-potential signal having the same magnitude but different phases will be detected by the second active sensor electrode 20 b and the common electrode.
- a negative feedback difference common mode signal 221 and a buffer/balanced circuit 222 to provide a circuit with a self common point electrode potential. Therefore, the user's bio-potential signals can be detected by the first active sensor electrode 20 a and the common point electrode. In the meantime, another bio-potential signal having the same magnitude but different phases will be detected by the second active sensor electrode 20 b and the common electrode.
- FIG. 3 Please refer to FIG. 3 for an illustrative view of the treadmill according to the present invention when it is in use.
- a first active sensor electrode 20 a and a second active sensor electrode 20 b are disposed at the user's handrail of a treadmill A.
- the pulse measurement device 20 is installed at an obvious and convenient location for the user to read the heart rate data or related information easily through a display device 27 , and the pulse measurement device 20 has an input device 26 on one side, so that a user can enter external data or related settings to the internal components of the pulse measurement device 20 .
- FIG. 4 Please refer to FIG. 4 for the illustrative view of a fitness bicycle according to the present invention when it is in use.
- the first active sensor electrode 20 a and the second active sensor electrode 20 b of the present invention are disposed at the handle of the fitness bicycle B, and the pulse measurement device 20 is installed at the middle of the handlebar of the fitness bicycle B so that the user can read the heart rate data or related information easily from the display device 27 .
- an input device 26 is disposed on one side of the pulse measurement device 20 so that the user can enter external data or related settings to the internal components of the pulse measurement device 20 .
Abstract
Description
- The present invention relates to a contact type pulse measurement device, more particularly to a contact type pulse measurement device installed in handheld equipment for measuring the pulse of a user when the user holds such device by a hand.
- At present, there are two general methods used for measuring the heartbeat rate of exercisers when using sport equipments for the exercise. One method detects the change of blood density in the human skin for the pulse measurement, and the other method detects the potential signal produced by the weak amplitude of vibration of the current, which is the so-called bio-potential signal for the pulse measurement. For the method using the change of blood density in the exerciser's skin for the pulse measurement, a device such as a clamp or a bracelet is generally used to be fixed onto the exerciser's body. However, the device using a clamp or a bracelet is movable and thus the electric wire may be exposed partially. The device will be moved and the electric wire will be shaken or twisted when the exerciser is doing exercises. The displacement of the device and the interference of the conductive wire according to the foregoing phenomenon directly affect the computation for measuring the heartbeat rate with respect to the microprocessor of the system, so that the measured value of the heartbeat rate may be inaccurate and results in a large error. In the meantime, the conductive wire also affects the direction or is in the way of the of the exerciser's movement.
- Further, a bio-potential signal is used for the pulse measurement by directly putting an electrode sensor of the fitness equipment in contact with the human body, so that the conductive wire will not vibrate and thus overcoming the shortcoming of causing interferences. Since the current bio-potential signal measuring device (as shown in
FIG. 1 ) requires two electrode sensors, which are a pair of corresponding sets including a firstactive sensor electrode 10 a with a first commonpoint sensor electrode 10 b and a secondactive sensor electrode 10 d with a second commonpoint sensor electrode 10 c (wherein the foregoing first commonpoint sensor electrode 10 b and the second commonpoint sensor electrode 10 c are connected together to form the same potential). The two sets of electrode sensors are connected to apulse measurement device 10 by aconductive wire pulse measurement device 10 comprises abio-potential detector 11 connected to the foregoing two sets of electrode sensors, abio-signal measurement 12 for receiving the signal transmitted from thebio-potential sensor 11, an analog filter/amplifier for receiving the signal transmitted from thebio-signal measurement 12, and anassociative processing unit 14 for receiving the signal processed by the analog filter/amplifier unit 13 for the processing or comparison of related settings, asignal processing unit 15 for processing the signal and displaying a pulse data on adisplay device 17 and also feeding back the signal to theassociative processing unit 14 for the interactive processing. Further, theassociative processing unit 14 can be connected to anexternal input device 16 for entering data or related settings. - Although the foregoing device does not have shaking conductive wires anymore and can overcome the shortcoming of having interferences, each of the two sets of electrode sensors at the gripping positions of the left and right hands should have a first
active sensor electrode 10 a and a first commonpoint sensor electrode 10 b (a secondactive sensor electrode 10 d and a second commonpoint sensor electrode 10 c). A user has to hold the firstactive sensor electrode 10 a and the first commonpoint sensor electrode 10 b with one hand and the secondactive sensor electrode 10 d and the second commonpoint sensor electrode 10 c with the other hand for its use, so that the user's bio-potential is detected by the firstactive sensor electrode 10 a and the first commonpoint sensor electrode 10 b (or the secondactive sensor electrode 10 d and the second commonpoint sensor electrode 10 c) through the user's hand. However, a hand is holding the firstactive sensor electrode 10 a and the first commonpoint sensor electrode 10 b (or the secondactive sensor electrode 10 d and the second commonpoint sensor electrode 10 c), and it will reduce the contact area of the electrode sensor and affect the reliability of receiving the signals. Therefore, when a user is doing exercise, the user may have small hands or wants to change gestures or is afraid of not able to grip the firstactive sensor electrode 10 a and the first commonpoint sensor electrode 10 b (or the secondactive electrode sensor 10 d and the secondcommon point sensor 10 c) at the same time, it will affect the measured value of the pulse. - The primary objective of the present invention is to provide a solution to overcome the foregoing shortcomings and avoid the existing deficiency by providing a contact type of pulse measurement in accordance with the present invention. The present invention aims at the present shortcoming of the prior-art electrode sensors that requires users to hold a first active sensor electrode and a common point sensor electrode (or a second active sensor electrode and a second common point sensor electrode) to develop a contact pulse measurement device of the present invention that only requires one hand to grip an electrode sensor. As long as the electrode sensor fits the shape of the installed equipment, it will provide a larger contact area for gripping, and users can freely make adjustments to their gestures.
- To achieve the foregoing objectives, the contact type pulse measurement device of the present invention is a pulse measurement device installed onto various kinds of handheld equipments, so that users can detect the pulse condition by holding the device which comprises a first active sensor electrode and a second sensor electrode having opposite polarities with each other, and the two active sensor electrodes respectively connected to the pulse measurement device by conductive wires, and the pulse measurement device comprises a bio-potential sensor connected to the foregoing two electrode sensors, a bio-signal measurement for receiving the signal transmitted from the foregoing bio-potential sensor, and the bio-signal measurement is connected to a negative feedback difference common mode signal and a buffer/balance circuit, and the buffer/balance circuit feeds back the signal to the signal measuring device, and the foregoing two sets of units provide a circuit with a common point electrode potential such that the negative feedback difference common mode signal and the buffer/balance circuit provide a circuit with a self common point electrode potential. Therefore, the first bio-potential signal can be detected by means of the first active sensor electrode and the common point electrode. Similarly, a second bio-potential signal having the same magnitude but a different phase as the first bio-potential signal can be detected by the second active sensor electrode and the common point electrode. When the contact type pulse measurement device uses such mechanism to measure biological signals, it only needs to have a sensor at the position of both hands to achieve the function of measuring pulses.
-
FIG. 1 is a circuit block diagram according to a prior art. -
FIG. 2 is a circuit block diagram according to the present invention. -
FIG. 3 is a view of the treadmill according to the present invention when it is in use. -
FIG. 4 is a view of the fitness bicycle according to the present invention. - To make it easier for our examiner to understand the objective of the invention, its structure, innovative features, and performance, we use a preferred embodiment and the attached drawings for the detailed description of the invention.
- Please refer to
FIG. 2 for the circuit block diagram of the present invention. InFIG. 2 , a contact type pulse measurement device is a pulse measurement device installed to all kinds of handheld equipments, so that a user can grip the pulse measurement device to measure the pulse condition; wherein the contact pulse measurement device of the invention comprises a firstactive sensor electrode 20 a and a secondactive sensor electrode 20 b having opposite polarities with each other, and the twoactive sensor electrodes pulse measurement device 20 respectively byconductive wires - Unlike the prior art, the
pulse measurement device 20 of the present invention comprises abio-potential sensor 21 for connecting the foregoing twoactive sensor electrodes active sensor electrode 20 a and the secondactive sensor electrode 20 b; abio-signal measurement 22 for measuring the signal transmitted from thebio-potential measuring device 21; a negative feedback differencecommon mode signal 221 and a buffer/balanced circuit 222 being connected to thebio-signal measurement 22 for feeding back a signal to thebio-signal measurement 22 and thus providing a circuit with a self common point electrode potential. The present invention makes use of a negative feedback differencecommon mode signal 221 and a buffer/balanced circuit 222 to provide a circuit with a self common point electrode potential to cope with the firstactive sensor electrode 20 a and the secondactive sensor electrode 20 b. When thepulse measurement device 20 of the invention measures the biological signal, it only requires one electrode sensor at the contact position of both hands. In the meantime, thebio-potential sensor 21 is connected to a ESD (Electro-Static Discharges)protection circuits 211 for protecting thepulse measurement device 20 from being damaged by the surge of external voltage. - Further, an analog filter/
amplifier unit 23 for receiving signals transmitted from theforegoing bio-signal measurement 22 is used to filter and amplify the signal amplitude of within the electro-cardio frequency of the measured signal and facilitate the application later. - An
associative processing unit 24 receives the signal filtered and amplified by the foregoing analog filter/amplifier unit 23 to the process or compare parameter settings. Asignal processing unit 25 will display a processed signal (such as a heart rate count or a comparison of standard heart rate value) on adisplay device 27 and shows the user's heart rate data or related information. In the meantime, thesignal processing unit 25 also feeds the signal parameter back to the foregoingassociative processing unit 24 for the setup of the system parameters. Further, anassociative processing unit 24 is connected to aninput device 26, so that users can enter external data or related parameter settings to theassociative processing unit 24. - Further, a
display device 27 can be detached from thepulse measurement device 20 and integrated with a screen display of the system in which thepulse measurement device 20 is installed. - The
pulse measurement device 20 of the present invention mainly uses a negative feedback differencecommon mode signal 221 and a buffer/balanced circuit 222 to provide a circuit with a self common point electrode potential. Therefore, the user's bio-potential signals can be detected by the firstactive sensor electrode 20 a and the common point electrode. In the meantime, another bio-potential signal having the same magnitude but different phases will be detected by the secondactive sensor electrode 20 b and the common electrode. When such mechanism of the contact typepulse measurement device 20 is used to measure biological signals, it only requires one electrode sensor at the contact positions of both hands to achieve the function of measuring pulses. - Please refer to
FIG. 3 for an illustrative view of the treadmill according to the present invention when it is in use. In the figure, a firstactive sensor electrode 20 a and a secondactive sensor electrode 20 b are disposed at the user's handrail of a treadmill A. Thepulse measurement device 20 is installed at an obvious and convenient location for the user to read the heart rate data or related information easily through adisplay device 27, and thepulse measurement device 20 has aninput device 26 on one side, so that a user can enter external data or related settings to the internal components of thepulse measurement device 20. - Please refer to
FIG. 4 for the illustrative view of a fitness bicycle according to the present invention when it is in use. In the figure, the firstactive sensor electrode 20 a and the secondactive sensor electrode 20 b of the present invention are disposed at the handle of the fitness bicycle B, and thepulse measurement device 20 is installed at the middle of the handlebar of the fitness bicycle B so that the user can read the heart rate data or related information easily from thedisplay device 27. Further, aninput device 26 is disposed on one side of thepulse measurement device 20 so that the user can enter external data or related settings to the internal components of thepulse measurement device 20.
Claims (4)
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US10/799,729 US6945940B1 (en) | 2004-03-15 | 2004-03-15 | Contact type pulse measurement device |
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US10/799,729 US6945940B1 (en) | 2004-03-15 | 2004-03-15 | Contact type pulse measurement device |
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Cited By (1)
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US20100307785A1 (en) * | 2009-06-08 | 2010-12-09 | Cardinal Health 209, Inc. | Cable for enhancing biopotential measurements and method of assembling the same |
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DE102006038399A1 (en) * | 2006-08-15 | 2008-02-21 | Soehnle Professional Gmbh & Co. Kg | bathroom scales |
US20080119330A1 (en) * | 2006-11-22 | 2008-05-22 | Boson Technology Co., Ltd. | Intelligent vehicle meter |
US20090247368A1 (en) * | 2008-03-31 | 2009-10-01 | Boson Technology Co., Ltd. | Sports health care apparatus with physiological monitoring function |
DE202008004583U1 (en) | 2008-04-02 | 2008-06-05 | Boson Technology Co., Ltd. | Fitness machine with the possibility for physiological monitoring |
US20100256475A1 (en) * | 2009-04-07 | 2010-10-07 | Cheng-Tang Chiang | Physiological-measurement health-care sport suit |
DE202010001514U1 (en) | 2010-01-28 | 2010-04-15 | Boson Technology Co., Ltd. | Sportswear with the possibility of detecting the physiological condition |
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US4715384A (en) * | 1982-02-03 | 1987-12-29 | Kabushiki Kaisha Daini Seikosha | Pulsimeter |
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US5365934A (en) * | 1991-06-28 | 1994-11-22 | Life Fitness | Apparatus and method for measuring heart rate |
US6522255B1 (en) * | 1998-03-02 | 2003-02-18 | Steve Hsieh | Handle sensor for detecting signals from human body to a signal processing circuit |
US6506153B1 (en) * | 1998-09-02 | 2003-01-14 | Med-Dev Limited | Method and apparatus for subject monitoring |
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US20100307785A1 (en) * | 2009-06-08 | 2010-12-09 | Cardinal Health 209, Inc. | Cable for enhancing biopotential measurements and method of assembling the same |
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