The invention is related to a device to sense the pulse on a wrist of a subject and to arrive at the health status of the said subject. Further, the invention relates to the said device to capture the pulse in real time; analyze the pulse based on time- frequency properties of the pulse signal and Vata, Pitta and Kaphahumors of the subject.

Background and prior art Diagnostics and treatment in Ayurveda are based on five basic elements present in the human body in terms of three humors, namely vata (mainly responsible for movements), pitta (mainly responsible for energy) and kapha (mainly responsible for structures). If these three components are present in right proportions, a person is said to be healthy. Pulse-based examination (nadiparikshan) is practised to access the levels of the three dosha (vata, pitta and kapha) in a subject to arrive at the dominance of specific dosha and also imbalance in doshas which are considered to be the root cause of any disorder.

Further, an ayurvedic practitioner uses visual examination and query based interaction with a subject coupled with the assessment of nadiparikshan to finally arrive at the tridosha levels in the subject.

The key challenge in nadiparikshan lies in minimising subjective in feeling of the pulses in a subject as this forms the basic input in the diagnostic and treatment process.

Several attempts have been made in the past to provide devices to accurately measure the pulse and link the pulse data to a subject's visual features and responses to queries.

The closest prior art1675/DEL/2007 relates to a non-invasive device for quantitative detection of arterial nadi pulse waveform and application of advanced machine learning algorithms to identify the pulse patterns. Three diaphragm-based strain gauge elements are to be placed at the exact vata pitta kapha pick up locations and they give equivalent electrical output. The system has a digitizer having an interface with the personal computer at the USB port. This pressure which is small in pressure units is captured in accurate, reproducible and noise-free waveforms to perform accurate diagnosis. A small air gap is introduced between each of the sensing elements and the skin of person. The physiological features such as rhythm, self- similar nature, and chaotic nature present in the pulse are extracted using rigorous machine learning algorithms that are represent various types and sub-types of nadi patterns.

This prior art has the following limitations

i. the recorded pulse data contains noise due to manual movement of the subject's hand or investigator's hand

ii. the rectangular shape of the orifices are not desirable as they may cause distortions in the detection of the pulses

iii. configuration of the sensors and the three orifices located on the neoprene sheet does not simulate the traditional "three finger assessment process" followed in ayurveda.

iv. neoprene sheet used to introduce air gap between the sensor and the skin is neither medically acceptable nor durable

v. the wired USB interface with the computer for storing the pulse signals on the computer is not easily portable There is therefore an unmet need to provide devices for the detection and reliable capturing of the noise free pulse characteristics of a subject at the appropriate locations of the subject's wrist with minimal positional error in a user friendly and standardised manner with minimal reliance on the expertise of the person measuring the pulses, analysing the same and providing a comprehensive diagnostic system involving the captured pulse characteristics, visual features, responses of a subject to structured queries to arrive at the tridosha levels in a subject to enable appropriate course of treatment of the said subject. Objects of the inventions

The main object of the invention is to provide a comprehensive cost effective device that sensitively senses and reliably measures the pulse of a subject, analyses the pulses, and correlate them with health indices of the said subject.

Another object of the present invention is to provide flexibility of applying different pressures on the three sensors located in the device to simulate the manner in which pulses are manually felt by a practitioner using his three fingers on the wrist.

Another object of the present invention is to correct for any noise interfering with the pulse data due to manual movement of the subject's hand or investigator's hand.

Another object of the invention is to provide machine learning on the centralized data of collected pulse signals to provide health indices for the diagnostic process.

Another object of the present invention is to provide a device with the option to simultaneously capture pulse signals on both the hands. Yet another object of the invention is to photograph face of the subject to enable "drushyam" information for the diagnostic process comprising "sparsha, darshana and prashna".

Yet another object of the invention is to record the voice of the subject to include the pitch of the subject simultaneously with recording the pulse signals.

Yet another object of the invention is to record the temperature of the subject simultaneously with recording the pulse signals. Detailed description of the Invention

The device of the present invention comprises: atleast one pulse portable detection unit, a base unit, and a storage system, wherein i. the pulse portable detection unit comprises an arrangement of at least three pressure sensors configured to provide an air gap between the sensors and the pulsating substrate to sense the pulse at the vata, pitta and kapha locations on the wrist of a subject, an accelerometer, a controller for controlled acquisition of signals by the said pressure sensors and said accelerometer ; ii. the powered base unit operable connected to the storage unit selected from a communication device, a computer or a cloud based storage.

The apertures associated with the pressure sensors are configured to provide elliptical shaped air gaps between the sensors and the pulsating surface to simulate the manner in which pulses are manually felt by a practitioner using his three fingers on the wrist.

In one of the embodiments, a gap is provided in the base unit for gripping the wrist of the said subject when the reading of the pulse is taken using the portable unit.

In an embodiment, two pulse portable detection units may be operably connected to the powered base unit to simultaneously capture pulse signals on both the hands of a subject.

Single, dual or triple axis accelerometers may be used, though a triple axis accelerometer is preferred. More preferably, the accelerometer is micro electromechanical system (MEMS). However, two 2 axis ones mounted at right angles would also serve the purpose.

In an embodiment, a base unit may be configured as a wrist-rester wherein the upper surface has two slopes angled at Θ varying from 120 ⁰ to 179°.The wrist-rester ensures that the wrist of the subject is placed in a range of pre-set angles for recording of the pulse signals.

A temperature sensor for recording the temperature of the subject, a camera to photograph the subject, a microphone to record the voice of the subject may be provided in the pulse portable unit or in the base unit. The data acquisition and analysis system including display of the results may be suitably integrated into the storage unit and located in storage unit.

Figures 1 -8 illustrate a specific embodiment of the present invention.

Figure 1 displays the vata, pitta and kapha locations of the pulse on a subject's two wrists wherein the pulse is sensed using the traditional methodology. In the figure 1 , (a) indicates left hand of the subject, (b) indicates right hand of the subject, (c) indicates the root of the thumb on the wrist of both the hands just below which the pulse is traditionally sensed, (d) indicates vata location on both the hands, (e) indicates pitta location on both the hands, (f) indicates kapha location on both the hands.

Figure 2 displays the pulse recording system, wherein (g) indicates pulse signal measuring portable unit, (h) indicates powered base unit, (i) indicates cable connecting the two units.

Figure 3 displays the pulse signal measuring portable unit, wherein (j) is the accelerometer in the portable unit operably connected to the base unit to sense the spatial movement of the portable unit, (k) indicates the three flexible finger like structures operably connected to the base unit, configured to introduce the air gap between the three pressure sensors and the pulsating substrate being sensed, (I) indicates the space in the portable unit for the investigator to put his or her at least three fingers, (i) indicates the optional cable connecting the portable unit to the base unit.

Figure 4 indicates the bottom view of the pulse signal measuring portable unit, wherein (m) indicates the three air gaps introduced by the three flexible finger like structures of the portable unit.

Figure 5 displays the base unit wherein (n) is the power ON / OFF switch, (o) is the micro-usb connector for connecting the base unit to the storage system, (p) are LED indicators for displaying the battery life levels, (q) is an orifice to pass the cable from the portable unit, (r) is an orifice to pass the cable from an optional additional portable unit for other hand of the subject, (s) indicates a gap in the base unit to aid the investigators thumb to gripping the subject's wrist, (t) is an optional temperature sensor for recording temperature of the subject while simultaneously acquiring the pulse signals, (u) is an optional photo camera for taking the photograph of the subject, (v) is an optional microphone for recording the voice of the subject, (w) is the angle Θ at which the base unit is curved to raise the pulse sensing locations on the subject's wristfor recording of the pulse signals, wherein the said angle Θ may vary from 120 ° to 179 °. Figure 6 displays the process of the pulse acquisition method, wherein (x) indicates the three fingers of the investigator located in the portable unit, (g) is the portable unit, (y) is the right hand of the subject, (h) is the base unit, (i) indicates the optional cable connecting the portable unit to the base unit. Figure 7 displays an embodiment of the pulse acquisition system wherein (g) is the portable unit, (h) is the base unit, (aa)(ab)(ac) are the three pressure sensors operably connected to the base unit, (j) is the accelerometer operably connected to the base unit, (i) is the cable connecting the base unit with the portable unit, (ad) is the micro-controller to control the preset actions, (ae) is the battery operably connected to all the components, (af) is the BlueTooth operably connected to the storage system, (ag) is the local memory of the base unit for storing the acquired data, (o) is the micro-usb connection operably connected to the storage system, (n) is the ON / OFF switch operably connected to the micro-controller, (p) are the LED indications for battery operably connected to the micro-controller, (t) is an optional temperature sensor, (u) is an optional photo camera, (v) is an optional microphone.

Figure8 displays the use of the accelerometer data to remove noise from the recorded pulse data wherein (ag) is a samplepulse data of 20 secondsrecorded at vata location, (ah) is the first component of the accelerometer data recorded at the same time of (ag) pulse and (ai) is the resulting de-noised pulse datawith signal to noise ratio increased by 7.2 times. Process of recording pulses

The process of recording of the pulse signals using the specific embodiment illustrated in figures 1 -8, at the vata, pitta and kaphalocations on the wrist of a subject comprises steps of

i. switching ON (n in Figure 5) the base unit by the investigator and ensuring that there is sufficient power in the system

ii. inputting the medical information of the subject in the storage system

iii. optionally capturing the subject's photo and storing in the storage system iv. resting the subject's hand on the "wrist-rester"

v. appropriately gripping the subject's wrist by the investigator by placing his thumb inthe gap provided in base unit

vi. sensing the pulse by the investigator using his three fingers placed in the slot of portable unit and appropriately positioning the portable unit on the wrist's regionof the subject using the visualisation provided by a monitor.

vii. acquiring the signals from the pressure sensors, accelerometer, optional temperature sensor in local memory of the base unit and storing the data for further analysis after removal of the portable unit from the subject's wrist viii. optionally recording the subject's voice and storing in the storage system ix. switching OFF the base unit after the data acquisition.

The function of the accelerometer is to monitor the spatial movement of the portable unit containing pressure sensors during data acquisition and discard the pulse data collected due to movement of the wrist of the subject or hand of the investigator. When the accelerometer data values are steady, the simultaneously recorded pulse data does not carry any noise. The accelerometer data is used to produce the de- noised pulse data.

Each pulse signal is computed in terms of depth, intensity, amplitude, frequency, rhythm, length, type, quantity and texture.

The pulse data is analyzed with the help of visual information (darshana) through the face photo, feel information (sparsha) through the pulse signals and questions (prashna) to derive the health indices in terms of Ayurvedic terminologies such as gati, swaroop, prakruti, vikruti, samata, sthoolata, uttanata, gambhirata, sukshmata and bala.

The pulse data is analyzed to derive the health indices in terms of allopathic terminologies such as rate, rhythm, pulse rate variability, topology, cardiovascular parameters and with final remarks of healthy versus unhealthy.

The present system provides technological advancement over all prior art devices as the three pressure sensors in three finger like structures made of medically complied flexible material with elliptical air gap closely truly mimics the traditional method of pulse measurement with three fingers. This arrangement also provides flexibility of applying different pressures on the three pressure sensors located in the system.

Inclusion of the accelerometer provides a means to monitor the spatial location of the portable unit in real time on the wrist of the subject and to discard the data due to data collected during movement of the subject's wrist or the investigator's hand.

The system of the present invention also provides a means of simultaneously acquiring the pulse data from the writs of both the hands of the subject.

Acquisition of temperature, visual aspects, voice of the subject during the pulse data recording and then comprehensively analysing the acquired data provides reliable health indices and diagnosis comprising "sparsha, darshana and prashna".