US20210298661A1

US20210298661A1 - Apparatus, method, and system for testing human olfactory systems

Info

Publication number: US20210298661A1
Application number: US17/232,396
Authority: US
Inventors: David William Smith; Jesse Samuel Eberdt, III; Richard Michelli; William D. Woolf; William Linwood Douglas Townsend, JR.; Edward Karwacki
Original assignee: Olfaxis LLC
Current assignee: Olfaxis LLC
Priority date: 2015-04-03
Filing date: 2021-04-16
Publication date: 2021-09-30
Also published as: US20180110457A1; US10980467B2; WO2016161261A1

Abstract

An apparatus, module, methods and systems for automated, standardized assessment and analysis of a human olfactory system's odor detection ability as an indicator or predictor of cognitive impairment or change in cognitive health, and other health conditions such as diabetes. Notably, the present invention is operable for use across all age groups of humans and provides quantitative detection and analysis of a human olfactory system's detection ability compared to a relevant demographic population.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent application Ser. No. 15/562,966, filed Sep. 29, 2017, which is a 35 USC § 371 national phase application of PCT/US2016/025519, filed Apr. 1, 2016, which claims the benefit of U.S. Provisional Patent Application No. 62/142,726, filed Apr. 3, 2015, U.S. Provisional Patent Application No. 62/315,870, filed Mar. 31, 2016, and is a continuation in-part of U.S. patent application Ser. No. 15/087,181, filed Mar. 31, 2016, now U.S. Pat. No. 10,682,087, issued Jun. 16, 2020, each of which is hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is generally directed to an apparatus, method, and system for testing human olfactory sensory system functions. More particularly the present invention operates to provide a method for the precise generation of specified olfactory system testing odorants, for use in making standardized testing of olfactory systems, data collection, assessment, and predictive or diagnostic results, and even more particularly for human olfactory system odor detection, odor adaptation, odor discrimination and odor identification ability to identify disease or disorder(s) and as a predictive element of cognitive impairment.

2. Description of the Prior Art

A decrease in olfactory function with age has been attributed to a variety of factors, including normal anatomical and physiological changes in aging, trauma, environment, exposure to toxins, medications, and disease. A decrease in olfactory function has also been determined to be one of the best predictors of five-year survival. Other research shows that changes associated with diseases such as diabetes affects olfactory function. Cognitive disease or disorder, namely Alzheimer's disease, Parkinson's disease, traumatic brain injury, Amyotrophic lateral sclerosis (ALS) and schizophrenia, are known to be associated with olfactory dysfunction. In particular, the ability to identify and discriminate the odors, as well as the odor threshold, can be altered in cognitive disorders. These changes often occur as early manifestation of the cognitive pathology but they are not always diagnosed on time. Early diagnosis can lead to slowing, stopping, or reversing the progression of cognitive decline.
U.S. Pat. No. 6,059,724 for system for predicting future health by inventors Campell, et al. filed Feb. 14, 1997 and issued May 9, 2000 is directed to a computer-based system for predicting future health of individuals comprising a computer comprising a processor containing a database of longitudinally-acquired biomarker values from individual members of a test population; a computer program that includes steps for selecting from said biomarkers a subset of biomarkers for discriminating between members, and using the distributions of the selected biomarkers to develop a statistical procedure that is capable of being used for classifying members of the test population, and estimating quantitatively, for each member of the test population, the probability of acquiring the specified biological condition.
U.S. Pat. No. 6,325,475 for devices for presenting airborne materials to the nose by inventors Hayes, et al. filed Apr. 21, 1997 and issued Dec. 4, 2001 is directed to an ink-jet dispenser for the micro-dispensation of airborne materials into an individual's airspace for inhalation or sniffing. The ink-jet dispenser will allow the study of temporal integration times, inter-nostril summation, backwards and forwards masking, and other olfactory phenomena.
U.S. Pat. No. 6,338,715 for digital olfactometer and method for testing olfactory thresholds by inventors Hayes, et al. filed Mar. 31, 2000 and issued Jan. 15, 2002 is directed to a more reliable and precise method of determining the olfactory threshold is provided by a digitally operated apparatus that dispenses controlled amounts of a volatile test fluid from a digital jetting device of the type used for ink jet printing. A precise number and size of micro droplets are dispensed onto a heater which vaporizes the fluid at a test location where a patient can sniff and report whether the odor is sensed. Incremental adjustments are made to determine the approximate threshold of olfactory perception of the odor. Sensors are included to verify dispensing and to coordinate dispensing with breathing.
U.S. Pat. No. 6,557,394 for smell test device by inventor Doty filed Apr. 2, 2001 and issued May 6, 2003 is directed to a test for assessing a person's sense of smell and more particularly, toward a test which is easy to use and can be evaluated by the individual taking the test.
U.S. Pat. No. 8,429,950 for field olfactometer with differential flow-based dynamic dilution by inventor Wright filed Aug. 5, 2010 and issued Apr. 30, 2013 is directed to a low-cost field olfactometer that may be used to determine when an environmental odor is present in the ambient air in an amount which is at or above a predetermined dilution ratio. The invention also encompasses a method of olfactometry and a replaceable diluent filter cartridge assembly employed in the olfactometer and olfactometry method.
U.S. Pat. No. 8,469,293 for digital odor generator by inventors Doty, et al. filed Apr. 16, 2010 and issued Jun. 25, 2013 is directed to a digital odor generator or olfactometer and, more particularly, toward a digital odor generator that can be used to administer various odors alone or in various combinations to a patient or subject. The digital odor generator of the invention can also be used to administer olfactory tests remotely over the Internet or other network and to collect the results and tabulate data over such networks.
U.S. Pat. No. 8,820,265 for high-throughput operant sensory discrimination apparatus and method by inventors Palmer and Salemme filed Dec. 6, 2005 and issued Sep. 2, 2014 is directed to apparatus and systems useful in sensory discrimination. Through the use of a multi-well sample plate, the high-throughput analysis apparatus and method allow for rapid sensory discrimination of a large number of samples.
US patent application 2007/077,204 for olfactory identification tests for cognitive diseases and disorders by inventors Devanand, et al. filed Apr. 13, 2006 and issued Apr. 5, 2007 is directed to smell tests (odor identification tests) that are shorter that UPSIT, yet has a statistical sensitivity and specificity equivalent to or better than UPSIT. The odor identification tests of the invention are based on a core set of six odorants, where the six odorants can be selected from the following group of odorants: menthol, clove, leather, strawberry, lilac, pineapple, smoke, soap, natural gas and lemon. The invention provides odor identification tests that can: (1) discriminate between subjects who are normal and who have a neuropsychiatric condition, cognitive disease or disorder, and/or (2) predict which subjects with mild cognitive disorders will develop various neuropsychiatric conditions or cognitive diseases and disorders. In one embodiment, the test and methods of the invention can provide an early prediction or diagnosis of Alzheimer's disease that is important for patients (including patients who have mild cognitive disorders, such as MCI) and clinicians to make plans for the future and to institute early treatment.

SUMMARY OF THE INVENTION

The present invention is generally directed to an apparatus, methods, and systems for providing standardized testing of human olfactory systems. More particularly, the present invention operates to provide testing, data collection, assessment, and predictive or diagnostic results for human olfactory systems and even more particularly for human olfactory system odor detection, discrimination, odor adaptation, and identification abilities to aid in identifying mental disease, health disorders, health conditions and serve as a predictive element of cognitive impairment.
The invention is further directed to a standardized olfactory population database for automated quantitative comparison and analysis of the olfactory system of a human based on standardized measures. The invention is still further directed to an automated odorant-delivery cartridge for use with automated apparatus, method and systems of the present invention. The invention is still further directed to a module for connecting a cartridge to a mobile computing device. The invention is further directed to a method for presenting standardized odorants and standardizing the collection of olfactory test data. Specifically, in one embodiment, the invention standardizes odorant concentration calibration and a delivery system, so that regardless of the location of one or more of the devices of the present invention, the devices will deliver the same, known odorant concentration(s). Advantageously, this approach allows for repeated testing of a patient, longitudinal testing, and development of a normative database and an Olfaxis Index for objectively quantifying degradations in olfactory function. Another advantage of this approach is in providing testing of a new patient and comparing their test results with a normative appropriate demographic population where all olfactory measures were collected with identical, standardized odorants. Advantageously, this is possible with one test of the new patient. In contrast, the prior art requires repeated, long term testing of the new patient to compare the new patient's results with the normative appropriate demographic population.
The present invention provides systems and methods for the quantitative examination and analysis of a person's odor detection (odor sensitivity), discrimination, odor adaptation, and odor identification abilities, wherein the system includes a device and database that communicate; wherein the device is automated and the database houses various population distributions of odor response abilities as a standard of comparison. More specifically, this system includes at least one device in wired or wireless electronic network communication with a server, wherein the server is in communication with the database of population distributions. If the server is not currently connected to the device, the device is operable to store the demographics of the patient/subject, the results of the patient/subject, and upload the results of the patient/subject upon a connection becoming available.
The system provides for devices to independently and autonomously transmit and receive data to and from the server. The server, which may be a remote server computer in network-based communication with the testing apparatus or device, compares received results to the individual patient's previous measures and/or to the population database for one or more odorants to quantify an Olfaxis Index of olfactory function. This real-time or near-real-time analysis and reporting of data enables the rapid screening and comparison of test subjects. Thus, the present invention provides for comparing a person's olfactory performance to a standard (their own longitudinal or their own baseline, and/or against an appropriate demographic). The Olfaxis Index can aid in diagnostics for a multiplicity of conditions. Significant olfactory dysfunction can put a person at risk of smoke/fire, eating spoiled food, change of diet to a more unhealthy diet (more sugar, salt and fat), be related to diabetes, be symptomatic of traumatic brain injury, myasthenia graves, ALS, and as a biomarker for AD and PD. The prior art fails to provide, teach or suggest such a system and corresponding methods.
These and other aspects of the present invention will become apparent to those skilled in the art after a reading of the following description of the preferred embodiment when considered with the drawings, as they support the claimed invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a cartridge according to the present invention.

FIG. 2 illustrates another cartridge according to the present invention.

FIG. 3 illustrates a module according to the present invention.

FIG. 4 illustrates an olfactory measurement apparatus according to the present invention.

FIG. 5 illustrates another olfactory measurement apparatus according to the present invention.

FIG. 6 illustrates a system according to the present invention.

FIGS. 7A, 7B, and 7C illustrate population distributions of normal cognitive decline associated with ageing.

FIG. 8 illustrates an individual's longitudinal results compared to a population distribution over time.

FIG. 9 illustrates another testing system according to the present invention.

FIG. 10 is a schematic diagram of an embodiment of the invention illustrating a computer system for use with the present invention.

FIG. 11 illustrates a basic method for assessing cognitive decline.

FIG. 12 is a carrier gas assembly showing two parallel carrier chambers with their outputs coupled.

FIG. 13 is an odorant assembly with a semi-transparent body showing the piston in a closed position according to the present invention.

FIG. 14 is an odorant assembly with a transparent valve body showing the piston in a partially retracted position according to the present invention.

FIG. 15 is an odorant assembly side view showing odorant reservoir with an ultrasonic transducer below the valve body.

FIG. 16 is a schematic diagram of a system according to the present invention.

DETAILED DESCRIPTION

The present invention provides an apparatus, method, and system for standardized testing of human olfactory system functions. The invention includes an automated, standardized odor-delivery cartridge and odorant concentration measurement and calibration system for use with a testing apparatus having a controller for running the test sequence and capturing user input, with calibrated air flow or adapted to be connected with a smartphone or tablet computer or other computing device through a module. Preferably, the apparatus includes a photoionization detector (PID) to measure and/or calibrate the odor delivery cartridge. The apparatus is in electronic communication with at least one server computer and at least one database, preferably within a cloud-based computing network for providing real-time or near-real-time analysis of the data.
The prior art is limited regarding a standardized automated device, standardized odorants, method, or system for assessing overall olfactory functional status and predicting cognitive impairment based on odor detection, odor discrimination, odor adaptation, and odor identification. The prior art does not disclose a standardized odorant.
Thus, there is a long-standing, unmet need for a standardized, automated device, method, and system that can accurately and quantitatively examine and analyze a person's odor detection ability against their own history and against an appropriate demographic population, quantify changes in olfactory function over time, or identify dysfunction by comparing smell function against a standardized, demographic database (quantify an Olfaxis Index) in order to aid in the identification or diagnosis of physical health conditions, and to better predict a person's risk for cognitive impairment and/or other mental and related complications. The present invention solves this long-felt but unmet need by providing sealed cartridges/ampules and photoionization detectors to provide standardized concentrations of odorants.
The prior art, including U.S. Pat. No. 6,059,724 and others, fails to standardize olfactory measures. The present invention differs by standardizing olfactory measures, which allows for comparison of a new individual to the population metric (an Olfaxis Index). Standardization is essential for creation of an Olfaxis Index, and estimating quantitatively for each member of a test population, the probability of acquiring a specified biological condition (mental or physical). The present invention fulfills this long-standing unmet need by providing standardization of olfactory measures.
U.S. Pat. No. 6,338,715 describes that a precise number and size of micro droplets are dispensed onto a heater which vaporizes the fluid at a test location where a patient can sniff and report whether the odor is sensed. However, this approach is disadvantageous as the precise number and size of micro droplets assumes a chemical condition and there is no actual measure of concentration. By contrast, the present invention is advantageous in that it provides standardized concentrations. Also, the prior art reference is disadvantageous because dispensing the micro droplets onto a heater changes the molecular structure of the micro droplets, which could yield a different odor than the original unheated micro droplets.
U.S. Pat. No. 6,557,394 does not disclose measuring sensitivity of a person to an odor. Additionally, this patent document requires the test subject to (1) smell the odor and (2) identify the odor. Thus, if a person incorrectly identifies an odor or fails to identify the odor, it could be because the person can't smell the odor or the person can't identify or remember the name of the odor. Thus, this patent document requires a cognitive component, unlike the present invention which is effective at measuring smell using standardized odors. The present invention provides for measuring sensitivity of a person to an odor, which is a long-felt unmet need in the prior art.
U.S. Pat. No. 8,469,293 does not disclose standardized odorants. The generator is also costly, difficult to set up, use, and clean. In contrast, the present invention is cost effective, easy to set up, use, and clean.
US patent application 2007/077,204 does not describe measuring a sensitivity or threshold as in the present invention. Additionally, this patent document does not describe adapting to deterioration of test odorants, different temperatures, and/or humidity. There is no standardized measure disclosed by this patent document. There is also a requirement of a cognitive component to identify the odor in this prior art patent document.
Additionally, unlike the prior art, the present invention provides for measuring and standardizing olfactory functions of people of all ages for a variety of physical and mental conditions. While the present invention is operable for detecting the likelihood of a patient developing or detecting that a patient has developed Parkinson's and Alzheimer's, the present invention also provides for the detection of a variety of other disease across all age ranges. Specifically, the present invention is operable for detection of diabetes, exposures to toxins, allergies, and/or idiopathic conditions and diseases as well as predicting the onset of such conditions.
Cartridge
The present invention provides for a cartridge, generally described as 10 in FIGS. 1 and 2, for providing odorant for testing human olfactory systems. A cartridge is a small modular unit designed to be inserted into a larger piece of equipment. The cartridge houses, contains, or holds an odorant 12 for testing, and is connectable, by wire or wirelessly, to a computing device, which maintains control and command of the cartridge and receives input of testing results. In another embodiment, the cartridge houses, contains, or holds more than one odorant for testing, depending upon the nature of the test being run (threshold sensitivity, adaptation, odor identification, etc.). In the event that no network connection is available between the mobile computing device and the cartridge, the cartridge is operable to function independent of the mobile computing device and upload data to the mobile computing device upon restoration of a network connection between the cartridge and the mobile computing device. Thus, the communication between the cartridge and the computing device confers the delivery of the odor from the cartridge. The cartridge is smaller than odorant holders in olfactometers of the prior art and thus it is portable and disposable. The cartridge contains or holds the odorant, wherein, by way of example and not limitation, the odorant is a liquid, semi-solid, solid, or absorbed or adsorbed onto a support. The cartridge verifies that the contents match the correct stimulus paradigm by comparing the bar code on the cartridge to match the odorant and olfactometer system airflow and other operational parameters. The cartridge is also operable to verify purity for calculations of mixing to a specified percent concentration.
The cartridge 10 is preferably a sealed container constructed and configured to allow air to flow over at least one odorant 12 for creating an odor provided or presented to a human being tested. The cartridge 10 is a liquid- and odor-impermeable body and is filled with an inert gas designed to confine and preserve the odorant and the odor until the cartridge is activated. Activation of the cartridge includes any method for creating an opening into the cartridge for release of the odorant within. In a preferred embodiment, the cartridge includes an impermeable body 14 and an opening 18 that is sealingly engaged with an impermeable, pierceable cover 20 to form the liquid-impermeable, chemical-impermeable, and/or odorant-impermeable cartridge 10. The cartridge is permanently sealed with an impermeable cover, or a hermetically sealed glass ampoule to prevent odorant chemical deterioration, evaporation or oxidation to preserve odorant quality. The cartridge is preferably activated by puncturing the impermeable cover by piercing with an air inlet tube 22 and an air outlet tube 24 when the cartridge is inserted into an apparatus and activated. In an alternative embodiment, the impermeable body 14 is also pierceable. In another embodiment, the cartridge includes a glass ampoule that is broken inside a reservoir on use to ensure purity.
Preferably, the impermeable cartridge 10 holds a given volume of liquid odorant 12, the air inlet tube 22 sparges air through the odorant fluid 12, and the resulting air with odorant vapor exits the cartridge through the air outlet tube 24. In an alternative embodiment (FIG. 2), an odorant support 26 is disposed within the cartridge body to hold a solid or semi-solid odorant. The inserted air inlet and air outlet tubes are positioned relative to the odorant support in order to direct the flow of air over the odorant and prevent bypassing the odorant. In alternative embodiment, the support is a filter and the odorant is sprayed on the filter and allowed to dry. In another alternative embodiment, the support is a gel and the air inlet tube pierces through the gel, and then flows air over the surrounding gel. For creating the odorant with the ampoule, the glass ampoule is broken or dispensed into a reservoir.
The airflow tubes are separate, as shown in FIG. 1 or co-axial, as shown in FIG. 2. The co-axial tube system only requires the cover to be pierced in one location, thus reducing the risk of leakage around the tubing system.
In an alternative embodiment, the odorant and odorant support are partitioned in the cartridge body by at least one partition, wherein the partitioning allows vapor to fill the headspace of the cartridge body but restrict solid or semi-solid odorant particulate from entering the headspace, therein preventing particulate from entering the air-outlet tube. Example embodiments include U.S. Pat. Nos. 6,658,989, 6,645,537, 6,607,762, 6,589,577, 5,840,189, 5,325,765 and US Patent Publication Nos. 20130270176, 20130156897, each of which are incorporated by reference herein in their entirety.
Cartridges are designed, constructed, and configured to provide adequate headspace to meet the volumetric and/or concentration requirements of the testing to be performed, such that the necessary amount of odorant is delivered with each test. The headspace is configured and designed such that individual test actuations do not significantly diminish the headspace odor concentration. Additionally or alternatively, the apparatus is designed to control the testing actuation of a cartridge such that the headspace odor concentration is not significantly diminished. In other words, the apparatus will not actuate a test if insufficient headspace odor concentration is predetermined based on usage. In another embodiment, the test device and/or cartridge can preferably determine the absolute concentration or recognize the change in vapor pressure or volume or concentration of the odorant and correspondingly alter the airflow through the cartridge and/or alter the mixing with the carrier air so that the proper amount and concentration of the odorant is delivered. Thus, the odorant concentration in the cartridge is calibrated for each odorant delivery. In another embodiment, a separate, disposable reservoir is utilized for creating the odorant, with the cartridge preferably releasing the odorant into the reservoir.
The present invention thus provides for a cartridge for providing odorant for testing human olfactory systems. A cartridge is a small modular unit designed to be inserted into a larger piece of equipment. More particularly, the cartridge used in the present invention is designed and configured to contain an odorant and fit into a tester apparatus as described herein. The cartridge is not configured or designed for resealing after activation. In another embodiment, the cartridge is designed and configured to prevent resealing. The cartridge is a puncture-activated, non-refillable, non-resealable modular container with odorant that is standardized to provide a predetermined number of tests at a predetermined concentration and fit into a tester apparatus as described herein.
In a preferred embodiment, each cartridge also incorporates an identifier 32, such as a digital chip, bar code, etc., within, or about the cover or body to identify the odorant(s) in the cartridge. The identifier is automatically detected and read by a reader 33 and the information used to regulate the air flow and actuation rate of the cartridge. The identifier includes the odorant and/or cartridge characteristics necessary to perform the test. For example, the identifier includes the name of the odorant, carrier, concentration in carrier, headspace of the cartridge, maximum flow rate through the cartridge, maximum total odorant available, the vapor pressure, vapor ionization voltage, and any other chemical properties necessary to create a specified concentration of the odorant. The information from the identifier is communicated to the device and/or remote server to calibrate testing and standardize, normalize or otherwise correct test data for the particular odorant cartridge's properties.
In alternative embodiment, a cartridge is automated to present an odor to and obtain information from a person. Following odor presentation, the module or controller receives the user response data. The response data preferably are provided to a mobile computing device that communicates the response data with other system components.
More specifically, the cartridge houses a chip or other identifier preprogrammed to identify the odorant(s), total actuatable mass or volume of the odorant(s), and/or concentration of the odorant(s) in the headspace of the cartridge, all of which are communicated to the device. Preferably, the chip also is operable to measure a vapor pressure of the odorant. The vapor pressure is preferably used to calculate vapor concentration. The total acuatable mass or volume is the total volume, mass or amount of odor that can be delivered by test actuation from any given cartridge without affecting the concentration of the odorant and the reliability of testing. This volume or amount or concentration preferably remains constant for each cartridge type or test session. Verification of the concentration in the headspace or other concentration verification is used to indicate when the cartridge replacement is required (i.e., when the concentration is too low or the cartridge is spent). Preferably, verification of the concentration is performed via a photo ionization detector. The testing device controls and varies the delivered test air volume and test frequency. The delivered test air volume will vary based on the desired concentration to deliver to the subject and from presentation to presentation for the subject. The test frequency or trial rate (number of tests per time period) will vary based on the previous test air volume delivered, wherein the limiting factor for test frequency is the time required to saturate the headspace or otherwise ensure that the cartridge headspace has the proper odor vapor concentration, which is dictated by odorant(s) volatility and airflow.
In a preferred method, the total airflow delivered to the person being tested is constant. At the initial activation of a cartridge, the odor concentration is determined and the appropriate amount of airflow is calculated to provide adequate odor concentration for all programmed tests, e.g., for a given test session or patient or until the concentration is too low to continue (and then a new cartridge is used to replace the spent cartridge). Thereupon, for all tests the carrier airflow is adjusted to ensure constant delivered airflow and/or constant concentration while providing the appropriate odor concentration for the test. Delivered airflow is adjusted if the concentration or volume of odorant deteriorates.
The number of tests delivered per cartridge is not constant, but rather is determined by the odorant(s) physical properties and quantity and the desired delivered test air volumes.
In an alternative embodiment, the odorant is incorporated into a polymer (or other medium or containment vessel that will release odorant) that vaporizes the odorant when electrically-stimulated.
Module
The present invention includes a module, generally described as 40 in FIG. 3, designed, constructed and configured for accepting at least one cartridge containing an odorant or selection or group of odorants to be used for testing human olfactory systems.
Preferably, the olfactometry module includes an adaptor designed, constructed and configured for accepting and activating a puncture-activated, non-resealable cartridge with an odorant, an identifier and a headspace, the cartridge standardized to provide a predetermined number of tests at a predetermined concentration into the olfactometer, a detector for measuring the gas-borne concentration of the odorant in the headspace of the cartridge, a reader for reading the identifier to determine information used to regulate gas flow within the cartridge, an air flow generator, and a network port for communicating with a computing device to provide testing data to a system for analyses and storage. The module preferably includes a database of test results.
The module is a portable and preferably wireless component that communicates with a mobile computing device to provide testing data to a system for analyses and storage, wherein the mobile computing device is, by way of example and not limitation, a smartphone, watch, tablet, or laptop computer. The module is preferably operable to connect to the cloud, the Internet, or another device via a network for analyses and storage. The module also preferably includes a system for analyzing and storing data if a network connection is unavailable. Preferably, the module uploads the analyzed and stored data to a database over a network upon restoration of the network connection. In another embodiment, the module includes a local copy of the database. Preferably, the local copy of the database was downloaded during the last network connection between the module and the mobile device. The module preferably includes an adaptor, wherein the adaptor accepts the at least one cartridge, thereby initiating function of the module. In a preferred embodiment, the module has receivers 46 for multiple cartridges 10, provides dials 51 that regulate the air flow through the cartridges, and provides a fan 49 for generating air flow. Although dials are provided in one embodiment, the airflow is preferably determined by PID measures of a concentration or volume of the odorant. In alternative embodiments, the dials are electronic and/or the air flow generator is manual.
The module includes an electronic network port 47 for electronic communication, such as, by way of example and not limitation, USB or dongle, or wireless, such as, by way of example and not limitation, Bluetooth or NFC.
In yet another embodiment, the module is for personal use and in electronic communication with a mobile computing device, which is in communication with a server and database. By way of example and not limitation, the personal module is a dongle. Apparatus for assessing olfactory system odor detection ability to predict cognitive impairment and health conditions such as diabetes.
Apparatus
The present invention provides an apparatus which improves upon a device described in Bodyak N and Slotnick B, 1999. Performance of Mice in an Automated Olfactometer: Odor Detection, Discrimination and Odor Memory. 24 (6): 637-645; which is incorporated herein by reference in its entirety. The present invention provides for a tester apparatus, generally shown as 60 in FIGS. 4 and 5, either stationary or portable, which is pre-configured to accept odorant cartridges 10 or modules 40. These odorant cartridges contain an incorporated odorant that is releasable in predetermined amounts by the tester apparatus to form an odor in predetermined concentrations. Concentration-determining variables include odorant concentration, headspace volume, odorant surface area, odorant vapor pressure, ambient temperature, humidity, and air flow through the cartridge. Preferably, the tester apparatus is operable to determine ambient temperature and humidity. The tester apparatus can vary the amount of air flow through the cartridge in order to vary the amount of odorant released and thereby establish the odor detection abilities of the person being tested. Alternatively, the tester varies the amount of carrier air mixed with the odorized air or the aerosolized chemical exiting the cartridge to adjust the concentration of odorant to maintain a constant airflow to the person being tested. In another embodiment, the odor containment structure is a nasal mask.
As shown in FIG. 4, in a preferred embodiment the apparatus 60 includes a compressed air or gas supply 62, at least one gas filter 64, a carrier mass air controller 68, a stimulus mass air controller 70, at least one stimulus odorant container (single odorant cartridge 10 or multiple odorant cartridge 11), a detector (preferably a photo ionization detector (PID)) 72, a mixer 74, a cartridge identifier reader 33, an activator 31, an outlet 76 and a controller 78. In a preferred embodiment the compressed air is delivered to the at least one stimulus odorant cartridge 10 through stainless steel tubing, Teflon coated steel tubing, Teflon tubing, and/or glass tubing, and the air with odor is delivered to the outlet 76 through stainless steel tubing, Teflon coated steel tubing, Teflon tubing, and/or glass tubing. In a preferred embodiment, the detector 72 measures the concentration in the cartridge headspace and the odorant is heated or agitated in the cartridge until a specified odorant concentration exists in the headspace. Additionally or alternatively, the detector is incorporated into the air outlet.
The system includes four primary components that are cooperatively and operably connected to function together under the electronic commands of a system controller: a carrier gas dispenser, one or more odorant dispensers, an output station, and the system controller. The carrier gas is air or any other suitable gas, such as nitrogen.
The carrier gas dispenser and odorant dispenser are constructed and configured for delivering a predetermined volume of a carrier gas or an odorant at a predetermined flow rate using a fixed-volume flow controller and valves.
Fixed-Volume Flow Controller
Fixed-volume flow controllers are known in the art; basic components include a positive displacement pump, an actuator and a controller. In a preferred embodiment, the positive displacement pump is a reciprocating-type positive displacement pump. By way of example and not limitation, the positive displacement pump may be selected from the group consisting of a piston pump, a plunger pump, and a diaphragm pump. The positive displacement pump is connected to the motion-controlled actuator, wherein the actuator controls the displacement distance and the displacement velocity of the piston, plunger or diaphragm with a high degree of precision. By controlling these two parameters, the actuator ensures that a predetermined volume of the gas is provided at a predetermined rate.
An example flow controller includes a piston pump, an actuator, a position sensor, control valves, controller, and a power source. The control valves can be activated by pressure, mechanical force, or electro-mechanical force. The position sensor indicates the physical position of the actuator and may be an encoder, potentiometer, lvdt, or any sensor capable of measuring linear position. The position sensor is read by the controller to determine position, and may be read during motion at known time intervals to determine velocity, acceleration, etc. Other components that can be used for alternative embodiments include one or more humidity sensors, temperature sensors, pressure sensors, or a variety of other sensors used to identify the state of the device. The actuator is any type of actuator that provides high accuracy, high precision displacement distance and displacement velocity. By way of example and not limitation, types of actuators suitable for use with the present invention apparatus include hydraulic, pneumatic, electric, thermal, or magnetic (shape memory alloys), and mechanical. In one embodiment, the actuator is a lead-screw driven by a gear-motor.
The flow-controllers contained within the device are sized so they can produce the required flow rate for the required time at a variety of concentrations. Flow rate and duration are chosen such that test subjects are presented with a sufficient volume of the mixture for a sufficient time to allow for identification. Example values are a rate of 5 liters per minute for duration of 2 seconds. The flow controllers may include additional capacity for other functions such as pre and post mixture flows and system purging.
Carrier Gas Assembly
The carrier gas assembly, generally shown as a carrier assembly with two parallel chambers and plungers concentrically therewithin (“carrier cylinders”), with coupled outputs 300 in FIG. 12, generates specific flow by first using pistons 312 to fill the carrier cylinders 315 with clean gas from a source. Preferably, the carrier cylinders 315 and pistons 312 are injection molded into one piece. The linear actuator 313 controls the motion of the pistons. The linear actuator 313 is preferably controlled by a controller. The controller wirelessly controls the linear actuator 313 remotely in one embodiment. In another embodiment, the controller is wired to the linear actuator 313. In one embodiment, the system includes a V-Fill valve which is opened to create a flow path from the source (62) to either 1) a downstream module (carrier or odorant) or 2) pulled through the system by the exhaust fan (321) for purging. The fan 321 flows to the exhaust 326 and/or to the gas or air source 62, which flows to the input filter 64. Preferably, operation of the V-Fill valve is controlled by a V-Fill solenoid. The source is ambient air or other gas or gases. In a preferred embodiment, the air or gas(es) is filtered to remove impurities and is also dehumidified or humidified to provide a clean gas at a predetermined humidity. This clean gas has two primary functions: 1) dilute the odorant to create known mixtures, and 2) purge the device to remove any residual odorant.
The gas filters include desiccants, such as silica gel and the like, and sorbents, such as molecular sieve materials, carbon filters, polypropylene fiber, cellulose fiber, carbon dioxide filters (KOH, NaOH), etc. The filtered air/gas is then piped directly to the carrier gas assembly through a gas conduit. The carrier gas assembly withdraws carrier gas from the gas conduit, and then injects it in a rate-controlled manner into the conduit leading to the final outlet. Along the way to the final outlet, the gas is mixed with an odorant from the odorant assembly.
Odorant Assembly
The odorant assembly generates a volume of chemical odorant at a requested concentration and delivers that volume at a requested flow rate. Each odorant assembly includes an odorant source, such as a disposable cartridge or glass ampule, a fixed-volume flow controller, and valves to facilitate odorant generation and dispensing. In an alternative embodiment, the odorant assembly includes a temperature sensor to determine the temperature of the odorant. The odorant dispenser is connected to the carrier gas conduit in order to receive the carrier gas for the purpose of diluting the odorant.
Preferably, the odorant cartridges, carrier chambers, and pistons assemblies, and valves are single use, disposable, and/or injection molded.
An example odorant assembly is shown in FIGS. 13, 14, and 15. In FIG. 13, the odorant assembly, generally described as 200, is shown with a transparent valve body. The odorant assembly includes a main inlet 201, a main outlet 203, piston 239, a piston shaft 237, a cylinder 235, a linear potentiometer 231, a balancer for offset load 233, an odorant or scent reservoir 229, a mixing chamber 205, a carrier gas inlet valve (valve A) 207, a mixture outlet valve (valve B) 209, an odor inlet valve (valve C) 211, a mixing chamber valve (valve D) 213, o-rings 215, a carrier gas inlet solenoid A 221 for controlling valve A, a mixture outlet solenoid B 223 for controlling valve B, an odor inlet solenoid C 225 for controlling valve C, a mixing chamber outlet solenoid D 227 for controlling valve D. The piston, piston shaft and cylinder form the piston assembly 238. As shown in FIG. 13, the valve configurations are set to allow carrier gas in through the odorant reservoir. Valve C 211 is open, allowing carrier gas into the odorant reservoir. The valve C includes an o-ring 215 seal at the bottom of the scent or odorant reservoir 229 and at the top of the scent or odorant reservoir 229. The piston 239 is illustrated in a closed position in FIG. 13. The assembly can include additional valves and conduits communicating with the mixing chamber to allow the odorant mixture to be routed to other devices, such as one or more detectors.
FIG. 14 shows an odorant assembly with a transparent view of more of the components of the odorant assembly. The piston 239 is illustrated in a partially retracted position in FIG. 14, allowing for a mixture of carrier gas and odor to fill the carrier chamber to where the piston is retracted. Valve C 211 of the odorant assembly is also open in FIG. 14.
FIG. 15 illustrates a side view of the odorant assembly showing the odorant reservoir 229 with an ultrasonic transducer 245 below the valve body.
The operation of the odorant assembly device includes a multiplicity of functions including, but not limited to: 1) filling with odorant, 2) filling with clean air, 3) delivering odorant to the test subject, and 4) purging the system with clean air or inert gas. A detailed description of the interrelationship of the parts of the odorant assembly device is included below, followed by a description of the positions of the parts of the odorant assembly when 1) filling the odorant assembly device with odorant, 2) filling with clean air, 3) delivering odorant to the test subject, and 4) purging the system with clean air or inert gas.
A main inlet or carrier gas inlet of the odorant assembly provides an opening for a tube or chamber between the carrier gas assembly and the odorant assembly. The carrier gas inlet solenoid A controls flow of the carrier gas into the mixing chamber of the odorant assembly via the carrier gas inlet valve (valve A). Suitable carrier gases include by way of example and not limitation: air, nitrogen, hydrogen, and helium. Preferably, the mixture inlet valve A is open to provide a flow path from to carrier source gas. Odor inlet valve (valve C) is open to provide a flow path across the odorant reservoir and into the odorant carrier chamber up to the point of the retracted piston. Valves B and D are closed. Upon retraction of the odorant piston the source gas flows into the mixing chamber, across the odorant reservoir, and into the carrier chamber up to the point of the piston.
In another embodiment, the mixture outlet valve (valve B) and the odor inlet valve (valve C) are in the closed position while the mixing chamber valve (valve D) is in the open position upon the carrier gas entering the mixing chamber of the odorant assembly. Upon a desired flow rate of the carrier gas being present in the mixing chamber, the odor inlet valve is moved into an open position via the odor inlet solenoid C. Preferably, the flow rate is set by the motion of the actuator and does not need to be measured. However, in one embodiment, the flow rate is measured at the carrier chamber or piston and in the mixing chamber. Preferably, concentration of the carrier gas does not need to be measured in the present invention, but is measured within the mixing chamber in one embodiment of the present invention. In another embodiment, the concentration of the carrier gas is measured by a single concentration sensor. Preferably, measurement of the concentration of the carrier gas is accomplished by diverting the flow of the carrier gas to the single concentration sensor, which is accomplished using a concentration sensor valve, a concentration sensor solenoid which controls the concentration sensor valve, and the single concentration sensor.
Opening of the odor inlet valve provides for the carrier gas to enter the scent reservoir and mix with odor from the odorant dispenser or odorant source to create a mixture of the carrier gas and the odor. Preferably, the scent reservoir includes an entrance valve with a seal and an exit valve with a seal to prevent liquid odor from spilling into vapor areas. Preferably, the odor inlet solenoid C is operable to simultaneously open or close both the entrance valve and the exit valve to the scent reservoir. In one embodiment, the scent reservoir includes means to add, change, or remove an odorant, such as a closable port in the top of the scent reservoir. A liquid or solid odorant is added or introduced via the closable port in the top of the reservoir. In another embodiment, a single or multi-use replaceable cartridge containing an odorant is added via the closable port in the top of the reservoir. However, in practice a variety of techniques may be used to accomplish this. In one embodiment, multiple scent reservoirs are utilized, each with a separate odor inlet valve controlled by a separate odor inlet solenoid, a separate scent reservoir exit face seal, and a separate chamber connecting the exit of the scent reservoir to the odor outlet and the carrier chamber and piston assembly.
Additionally, production of odor from the odorant can be accelerated by use of an ultrasonic transducer.
Once the carrier gas passes into the scent reservoir and mixes with the odor from the odor dispenser or the odor source, the mixture of the carrier gas and the odor passes through the odor inlet, through the chamber between the odor inlet and the odor outlet, and through the odor outlet. The mixture of the carrier gas and the odor then passes through a chamber connecting the odor outlet to the carrier chamber and piston assembly. Preferably, the piston is in a closed position such that the mixture of the carrier gas and the odor does not pass into the carrier chamber until activation of the piston. Upon activation (retraction) of the piston, the mixture of the carrier gas and the odor flows into the carrier chamber up to the point to which the piston has been activated. The point to which the piston has been activated is preferably a predetermined distance. Preferably, the piston is retracted a specific distance to capture a specific volume of air saturated with odorant. In one embodiment, the predetermined distance of activation of the piston is determined and/or implemented by a linear potentiometer. A balancer is also preferably provided to off-set the load. In another embodiment, it may be desirable to dilute the air saturated with the odorant within the carrier chamber up to the point of the piston. This is accomplished by drawing additional clean air into the carrier chamber up to the point of the piston that already contains an amount of air saturated with odorant. When filling with clean air, the V-Fill valve is opened on the carrier gas dispenser to provide a path to clean air. Within the odorant module valves A and B are open while C and D are closed. The piston is retracted, drawing clean air directly into the carrier chamber up to the point of the piston. The piston is retracted a specific distance to capture a specific volume of clean air.
Upon reverse activation (closing or retracting) of the piston, the mixture of the carrier gas and the odor is forced from the carrier chamber and piston assembly and through the chamber connecting the carrier chamber and piston assembly and the odor outlet. Upon opening of the mixture outlet valve via the mixture outlet solenoid B, the mixture of the carrier gas and the odor passes into the mixing chamber. Preferably, opening of the mixture outlet valve and the reverse activation of the piston is performed simultaneously. Preferably, the system controller includes a mechanism, which provides for simultaneous opening of the mixture outlet valve and the reverse activation of the piston.
Upon opening of the mixing chamber valve via mixing chamber outlet solenoid D, the mixture of the carrier gas and the odor flows out of the odorant assembly. In one embodiment, the mixture outlet valve is closed before opening the mixing chamber valve or at the same time as opening the mixture chamber valve. Preferably, the mixture of the carrier gas and the odor flows out of the odorant assembly and into an output station such as a nasal/face mask.
When delivering odorant to the test subject, the V-Fill valve is preferably closed and the carrier chamber preferably has already been filled with clean air via movement of the piston. Within the odorant module, valve A, valve B (the mixture outlet valve), and valve D (the mixing chamber valve) are open while valve C (the odor inlet valve) is closed. The carrier piston begins to extend to start the carrier flow passing through the odorant module's mixing chamber (flows from valve A to D), and (at the same time or later) and odorant piston extends to inject odorant via valve B. The two flows mix are exit the mixing chamber via valve D and are delivered to the test subject.
Preferably, all valves are operable to be moved to open positions via a single action using the system controller by activating the carrier gas inlet solenoid A, the mixture outlet solenoid B, the odor inlet solenoid C, and the mixing chamber outlet solenoid D. The single action also closes the piston in one embodiment. In another embodiment, the single action opens the piston. The single action using the system controller is preferably automated. In another embodiment, the single action using the system controller is provided or activated when a button is positioned in a depressed position the system controller. However, in a preferred embodiment of the present invention, user-initiated actions via pressing of a button or performing any other action through a physical or electronic interface, including a Graphical User Interface (GUI) is performed only for beginning or starting or initiating the methods of the present invention and for identifying an odorant by the participant. Opening all the valves and opening and/or closing of the piston provides for a carrier gas to purge the odorant assembly of any residual odors.
When purging the mixing chamber, the V-Fill valve is closed and the carrier chamber and piston assembly has already been filled with clean air. Within the odorant module valves A and D are open, and B and C are closed. The carrier piston extends pushing clean air through the mixing chamber, forcing any residual odorant out via valve D.
In another embodiment, purging is accomplished by opening the V-Fill valve, opening valves A and D for one or more of the odorant modules, and turning on the fan (321) to pull clean air through the system (purge). Preferably the system includes a bypass for the output mask so no purge air is presented to the test subject.
When purging the odorant carrier chamber and piston assembly, the step of filling with clean air procedure is followed or repeated one or more times.
When purging the odorant reservoir, the odorant carrier chamber and piston assembly is filled with clean air or inert gas from a separate source. Valves C and D are open, and valves A and B are closed. The odorant piston is extended, pushing air through the odorant reservoir and out via valve D.
Thus, exemplary valve states for different operations are summarized as follows. Filling the carrier chamber and piston assembly with odorant: V-Fill open, A open, B closed, C open, D closed, retract piston. Filling the carrier chamber and piston assembly with clean air: V-Fill open, A open, B open, C closed, D closed, retract piston. Filling the carrier chamber and piston assembly with clean air is performed after filling the piston with odorant to dilute the odorant within the carrier chamber in one embodiment. Delivering odorant (mix): V-Fill closed, A open, B open, C closed, D open, start carrier flow, extend piston. Purging the mixing chamber: V-Fill closed, A open, B closed, C closed, D open, start carrier flow. Purging the odorant reservoir: fill odorant carrier chamber and piston assembly with clean air or inert gas (such as nitrogen, not shown), V-Fill closed, A closed, B closed, C open, D open, extend piston. Delivering the odorant (no mix): V-Fill closed, A closed, B open, C closed, D open, extend piston.
The odorant source contains the volatile chemical(s) of interest, most often in a liquid form, although a compressed gas form is provided for herein; and can be pure or diluted in another substance, such as water, diethyl phthalate, mineral oil, another carrier gas in the case of a compressed gas form, etc. The odorant source may be intended for single use or multiple uses. In preparation for mixture creation, some of the chemical source is converted from liquid to vapor. This conversion may be natural (diffusion) or accelerated through artificial means, such as ultrasonic vibration, heat, and the like. The conversion is designed to create a known volume of a known concentration of the odorant vapor. This is accomplished by the following steps:
1) Calculating the expected vapor pressure of the chemical using environmental conditions (temperature, humidity, etc.) and expected vapor pressure of any present diluent.
2) Exposing the chemical to a clean gas to provide for its diffusion into the clean gas.
3) Accelerating the diffusion using a catalyst or a catalytic action, by way of example and not limitation, using ultrasonic vibration, heat, etc., for producing an odorant at the chemical's vapor pressure (saturated odorant), and any excess chemical remains in liquid form, thus providing the chemical odorant at a known concentration.
4) Retracting the odorant dispenser's piston or actuator a specific or predetermined distance to draw the saturated odorant into the carrier chamber up to the point of the piston, thereby obtaining a specific volume of the chemical at the known vapor pressure.
5) Optionally filling the odorant disperser's carrier chamber and piston assembly with additional clean air to dilute the saturated odorant prior to mixing with the carrier stream. This may be done to improve accuracy of the mixture when producing relatively low concentrations. For example if the required concentration needs the odorant dispenser's carrier chamber and piston assembly to be filled with 10% saturated odorant, the remaining 90% may be filled with clean air, to allow utilization of the full range of travel of the odorant piston in order to improve movement accuracy. In this case the carrier stream flow rate would be adjusted to compensate for the additional dilution.
The odorant generated by this process represents the highest concentration of the chemical that may be achieved, limited by the physical properties of the chemical and the environmental conditions.
Mixing
The odorant vapor thus formed is mixed with clean gas to produce mixtures of lower concentration. Precise mixtures are created by dispensing the odorant vapor and clean carrier gas at specific rates and mixing their outputs.
Mixtures are created by the following steps:
1) Generating an odorant vapor and filling the odorant dispenser
2) Filling a clean gas dispenser
3) Calculating the required flow-controller speeds to generate the desired odorant/carrier gas ratio. For example:
a. Target is a 25% mixture of chemical A.
b. Calculate the vapor pressure of chemical A at the current environmental conditions, and determine that it will yield a 50% mixture in the odorant dispenser.
c. Given the odorant % and the target %, the flow ratio may be calculated by

- i. r_flow=(p_odorant/p_target)−1
- ii. r_flow=(50%/25%)−1
- iii. r_flow=1

d. This means the clean gas flow rate should equal the odorant flow rate.
e. Given the total flow rate, calculate the flow rates for the carrier gas and the odorant vapor.
4) Moving both flow controllers simultaneously and at the calculated flow rate ratio to mix the odorant and the carrier gas.
5) Mixing the flows from both controllers to create the desired mixture.
Output Station
The output station delivers the mixture to a test subject and includes systems and devices to capture subject feedback. The feedback methods include any of those known in the art, including touchscreens, keyboards, voice recorders, and the like. In an example embodiment for human odor testing and analysis, the output station is a nasal/face mask and the feedback capture device is a touchscreen on which the subject/patient reports odorant detection, or a microphone, into which the test subject speaks to identify the presence and characteristics of the one or more odors being delivered through the mask.
Detector
In one embodiment, the system includes an odorant detector, which detects and measures odorant levels in the carrier gas and transmits the data to the controller. The detector is preferably a photoionization detector, although any detector suitable for detecting volatile chemical vapors in a gaseous mixture can be used. In a preferred embodiment, the theoretical carrier gas concentration is calculated based on the chemical physical properties and environmental conditions, and thus advantageously no detector is needed.
System Controller
The system controller controls operation of the device. The primary function of the controller is to run one or more test sequences, where odorants of various concentrations are delivered to a test subject and the subject's feedback is collected and stored. In addition the controller is responsible for maintenance functions such as system diagnostics, cleaning, and communication of results.
During odorant mixture generation and delivery the system controller operates the various system components (valves, actuators, etc.) to produce the desired results. For mixing, the controller first calculates the speeds of the carrier and odorant actuators to produce the desired mixture and then drives the actuators at speeds to produce the desired mixture at the desired flow rate. Actuator motion may be controlled by a variety of closed-loop motion control schemes, such as proportional-integral-derivative control (PID-control), which utilize the feedback of the actuator's position sensor to precisely control motion.
The mixture concentration is determined by the relative flows of each actuator which is proportional to their actuation speed. The total flow rate is the sum of the flows of each active actuator.
A system according to the present invention, generally described as 100 in FIG. 16, includes a gas source and exhaust 20, one or more odorant dispensers 200, 240, 250, 260, a system controller 78, and an output station 76. Additional elements include a mixing chamber 205, a photoionization detector (PID) 72 and output filter 120.
Operational Sequences
Methods for operating the present invention include the steps of: dispensing an odorant mixture, capturing test subject feedback in response to being presented with a mixture, purging the system of odorants, and system diagnostics and maintenance.
The method steps for dispensing an odorant mixture, using the schematic system illustrated in FIG. 16, are as follows:

A) Filling the Carrier-Gas Dispenser 300:

1) Opening the valve V-Fill 224
2) Retracting the Clean-Air Dispenser, fill path is 1) Ambient Gas or Air 62, Input Filter 64, V-Fill 224, Clean-Air Dispenser 300.
B) Filling the Odorant Dispenser 200 with Odorant:
1) Opening valve V-Fill 224
2) Energizing the Ultrasonic Vibrator 245
3) Opening valve V-Odorant 211
4) Opening valve V-In 207
5) Retracting Odorant Dispenser Piston Assembly 238, fill path is 1) Ambient Air 62, Input Filter 64, V-Fill 224, V-In 207, V-Odorant 211 (including Odorant Reservoir 229), Odorant Piston/Cylinder Chamber

C) Delivering the Mixture to the Output Station 76:

1) Filling Clean-Air Dispenser 25 and Odorant Dispenser Piston/Cylinder Chamber as described above
2) Closing the valve V-Fill 224
3) Opening the valve V-In 207
4) Opening the valve V-Carrier Chamber 209
5) Opening the valve V-Output Station 213
6) Extending Clear-Air Dispenser and Odorant Dispenser simultaneously, flow paths are:
(a) Clean-Carrier Gas: Clean-Carrier Gas Dispenser 300 (Piston Chamber), V-In 207, Mixing chamber 205, V-Output Station 213, Output Station 76
(b) Odorant: Odorant dispenser piston assembly 238, V-Carrier chamber 209, Mixing chamber 205, V-Output Station 213, Output Station 76.
To deliver the odorant/gas mixture to the PID for calibration, the paths from the Mixing Chamber are as follows: V-Measure 247, PID 72.
To deliver the odorant/gas mixture simultaneously to the Output Station and PID, the paths from the Mixing Chamber are as follows: V-Output Station-213 and V-Measure 247, then Output Station 76 and PID 72.
Excess carrier gas or purging carrier gas flows from the fan 321 to 62 gas or air and/or 326 exhaust.
Multiple Odorant Mixtures, Delayed Onset and Masking of Changes
The system is also configured to provide multiple odorants simultaneously or sequentially. When mixing multiple odorants, the system controller provides for adjusting the carrier gas and individual odorant flows so that the maximum system flow capacity is not exceeded and the multiple odorants are at the desired concentrations.
The system also provides for sequential or delayed addition of odorants to the carrier gas. By way of example and not limitation, a second odor is added one (1) second after the first odor was introduced into the carrier gas.
In some cases, it is desirable to mask certain changes in the device operation from the test subject, in order to prevent the subject from making guesses as to when certain events occur, such as the start of an odorant flow or the addition of a secondary odorant. Changes may be inadvertently communicated to the test subject via changes in air flow, changes in sound, etc. Techniques to mask such changes may include concealment or misdirection. Concealment examples include 1) precise control over component flows (carrier and odorants) so the total flow rate does not change, for example as a first component flow increases a second component flow decreases at the same rate to maintain a consistent total; and 2) using silent actuators or sound insulation to prevent the test subject from hearing the internal operations of the device. Misdirection examples include 1) deliberate inconsistency in the odorant flow (pulsing) so changes are not distinguishable or 2) including a placebo flow which does not contain any particular odorant, while maintaining the same operation as the real odorants.
By way of example and not limitation, for the compressed air supply, a disposable compressed air volume (e.g., CO2 cartridge) or a small, quiet air pump is used. The apparatus is computer-controlled either directly through the controller 78 or remotely controlled via network-based communication.
In an alternative embodiment shown in FIG. 5, an extra headspace cartridge or reservoir 13 is used to provide extra headspace. Airflow through the odorant cartridge is routed to the extra headspace cartridge. When a test is actuated, the test air is taken from the extra headspace cartridge. Between tests the air is recirculated between the odorant cartridge and extra headspace cartridge to ensure the appropriate concentration of odor in the extra headspace cartridge.
The compressed air is channeled through the at least one odorant container, which is directed into the disposable or replaceable headspace reservoir 13 then mixed with an appropriate amount of more carrier air and sent to the mixer 74. As the stimulus air leaves the odorant container or extra headspace cartridge, the detector 72 determines if the required amount of odor is contained in the stimulus air. In the mixer, multiple stimuli odors are mixed and then sent to the output. Alternatively, fresh filtered air is pumped and channeled through the at least one odorant container.
The apparatus preferably includes an input device 82, such as a touchscreen, whereby the test administrator, the person being tested and/or other user input information, including demographic, medical, genetic, lifestyle information and the like.
The input device also provides for allowing the different users to share other database data, including social media databases, medical databases, genetic databases, genealogical databases, cognitive testing (e.g., Lumosity.com) databases and the like, which are uploaded to the system database.
Odorants may be sticky and adhere to the air flow channels, thus affect concentrations of tests. Sticking or fouling is prevented by a number of possible options, including use of concentric tubing arrangements where the odorant is presented from the center tube, into an airflow from larger surrounding tubes close to the point of emission into the area of detection testing. Desorption of air channels can also be provided by heating delivery tubing at high temperatures. For example, the air channels are stainless steel tubes, and are heated after a test to burn off the fouling odorant(s). Alternatively, the tubing between the cartridge and emission is designed and constructed to be easily changeable and inexpensive. Preferably, the tubing is operable to be cleaned for reuse or is disposable.
The apparatus includes detectors that can measure vapor concentration through such mechanisms as photoionization, thermal conductivity, charge detection, infrared absorption, etc. The apparatus then correspondingly alters the ratio of carrier air mixed with the cartridge effluent air, postpones a test, or alerts a test administrator so that only proper tests are performed. Preferably, the detector can detect the concentration of the odor in the air stream and vary the ratio of carrier air to sample air to achieve the desired concentration. Detectors include PID, charge detectors, other spectroscopy detectors and/or conductance detectors. Preferably, each cartridge automatically runs an initial calibration before testing begins. By way of example and not limitation, the cartridge is inserted, calibration is automatically performed, and testing is ready. Additionally, a control cartridge for calibrating an apparatus is provided.
The outlet preferably includes an odor containment structure, such as a funnel, nasal mask or sniff port for confining the odor such that it is not diluted by air currents. The person places his or her nose in the nasal mask to sense the odor. In a preferred embodiment, a photobeam is directed across the entrance of the odor containment structure, and when the person interrupts the photobeam, the tester emits the odor through an odor tube into the odor containment structure.
The present invention reduces the cost of testing humans for olfactory abilities through various ways. For example, the odorant cartridges are disposable, which allows proper standardization between cartridges and olfactometers so that the system and methods for testing are standardized. Furthermore, the testing time is decreased because the present invention increases the testing rate and reduces the preparation time, error rate and cleanup time versus prior art methods.
System for assessing olfactory system odor detection ability to predict cognitive impairment and health conditions such as diabetes, exposures to toxins, allergies, and/or idiopathic conditions and diseases.
The present invention provides for a system, generally described as 800 in FIGS. 6, 9 and 10, for testing and validating the smelling ability of humans. The system includes at least one tester apparatus 60 in communication through a wired or wireless electronic network 810 with a server 850. In one embodiment, the tester is not necessary to the function of the system as the apparatus controls itself or testing and validating is performed remotely. The server is in communication with a population database 870 of test results. Preferably, the population database 870 of test results includes previous longitudinal olfactory measures from the same individual. The system preferably provides for several or numerous tester apparatuses to independently transmit test results to the server. The server compares received results to the previous results for that patient and/or to the population database and also updates the population database with the results. The compared results, shown in FIG. 7, are transmitted back to the tester or local computing device associated with the tester. This real-time or near-real-time analysis and reporting of data enables the rapid screening, assessment, and comparison of test subjects. Furthermore, the system transmits new programs and stimulus conditions to testers.
The present invention also provides for semi-autonomous administration of tests, wherein the apparatus is able to provide tests without connection to a server, but once the apparatus is in network communication with the server, the test data are uploaded and analysis performed at the server.
In another embodiment, the apparatus is a remote-controlled device, wherein the tests are administered from a remote location. In these embodiments, the test administrators can instruct the person being tested via GUI or voice instructions, or conduct the test automatically with the patient or subject without input from a local administrator.
Database
In a preferred system, the assessments are more valid and reliable when the instant scores or results are compared against a population database of standardized test results. Preferably, the population database is a demographically appropriate database selected from an overall population database. The comparison may be limited to assessments of the individual in past tests or limited to assessments of family members of the individual in past tests. This provides for longitudinal testing. In one embodiment, the population database of test results includes demographic sub-populations, wherein the assessments of the instant scores or results are compared against one or more relevant demographic sub-populations. Preferably, the demographic sub-populations are constructed by age, weight, gender, socioeconomic status, ethnicity, height, genetic predispositions, existing health conditions, and combinations thereof. Preferably, the instant results populate and grow the database to further enhance the reliability of the population database. Preferably, the instant results are validated or verified prior to being incorporated in the database. The database contains population distributions, such as shown in FIG. 8, for a variety of odorants, such as, by way of example and not limitation, pure compounds, compound mixtures, masking compounds and masking mixtures. Preferably, common odorants such as rose, clove, eucalyptus, and lemon are used for odor identification, with pure odorants being used for sensitivity. For example, a population distribution exists for methanol, butanol, or methanol and butanol mixed. Significantly, the device of the present invention affords standardized quantifiable data so assessment verification can be performed.
Preferably, the population database only includes dynamic, collected population data. The dynamic, real-time updating of the database provides for testing against the most current data. Furthermore, changes in populations can also be tracked over time with the present invention. Thus, not only can individuals be compared to populations, but cohort populations can also be compared to previous populations to see if the population is varying.
Alternatively, test comparisons are initially performed using variances or estimated standards. A database for the new population is simultaneously populated with data collected via testing until a given number of records populate the database, at which point the comparisons are performed against the database of collected population data.
Also alternatively, the testing is started without standards and the comparisons are performed after a sufficient number of persons are tested to create a population variance.
A population database according to the present invention includes, by way of example and not limitation, demographic, medical, and occupational variables of humans. Demographic variables include race, age, marital status, occupation, income, religion, residence, ethnicity, diet and sex. Medical variables include existing co-morbidities, family history, medications and genetics. Occupational variables include sport and chemical exposure. Other database that can be used include genetic databases, genealogical databases, and cognitive testing (Lumosity.com) databases.
Another database embodiment provides for a database that contains population distributions for any olfactory test with any pure compound or compound mixture based on where in the olfactory system anatomy they are tested: the receptor, olfactory bulb, or piriform cortex, and/or prefrontal cortex. In general, the present invention provides for addressing disease processes and injury at different locations in the olfactory nervous system pathway, for example, but not limited to in odor detection in the olfactory epithelium (with olfactory sensory neurons), odor discrimination in the olfactory bulb, odor identification in the piriform cortex and odor adaptation in the epithelium.
For example, a pure monomolecular chemical, such as methanol, has a population distribution for detection, threshold testing, and/or overall sensitivity testing at the receptor, whereas a mixed compound, such as methanol and butanol, has a population distribution for testing and discrimination at the olfactory bulb.
Odorants include complex odorants that include more than one odorant, such as, by way of example and not limitation, natural odorants such as coffee, grass, gas, and the like.
Another embodiment provides for a database that contains population distributions developed from odorant testing of a compound specific to an odor sensing nerve type, wherein the compound is pure, mixed, or masking and the nerve type is olfactory (CN1) or trigeminal (CN5).
Another embodiment provides for a database that contains population distributions developed from odorant adaptation, wherein the distribution is time-to-adaptation for specific pure or mixed compound(s).
In a preferred embodiment, the population distributions within a population database are normalized. By way of example and not limitation, a normal distribution is z-score normalized. This normalization allows test scores to be compared against the variance of the population, thereby confirming where in the population the person lies. In another embodiment, the population database is a population of absolute and relative concentration values. In yet another embodiment, a separate population database exists for absolute and normalized populations.
Computing System
FIG. 10 is a schematic diagram of an embodiment of the invention illustrating a computer system, generally described as 800, having a network 810, a plurality of computing devices 820, 830, 840, a server 850 and a database 870.
The server 850 is constructed, configured and coupled to enable communication over a network 810 with a computing devices 820, 830, 840. The server 850 includes a processing unit 851 with an operating system 852. The operating system 852 enables the server 850 to communicate through network 810 with the remote, distributed user devices. Database 870 may house an operating system 872, memory 874, and programs 876.
In one embodiment of the invention, the system 800 includes a cloud-based network 810 for distributed communication via a wireless communication antenna 812 and processing by a plurality of mobile communication computing devices 830. In another embodiment of the invention, the system 800 is a virtualized computing system capable of executing any or all aspects of software and/or application components presented herein on the computing devices 820, 830, 840. In certain aspects, the computer system 800 may be implemented using hardware or a combination of software and hardware, either in a dedicated computing device, or integrated into another entity, or distributed across multiple entities or computing devices.
By way of example, and not limitation, the computing devices 820, 830, 840 are intended to represent various forms of digital computers 820, 840, 850 and mobile devices 830, such as a server, blade server, mainframe, mobile phone, a personal digital assistant (PDA), a smart phone, a desktop computer, a netbook computer, a tablet computer, a workstation, a laptop, and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the invention described and/or claimed in this document
In one embodiment, the computing device 820 includes components such as a processor 860, a system memory 862 having a random access memory (RAM) 864 and a read-only memory (ROM) 866, and a system bus 868 that couples the memory 862 to the processor 860. In another embodiment, the computing device 830 may additionally include components such as a storage device 890 for storing the operating system 892 and one or more application programs 894, a network interface unit 896, and/or an input/output controller 898. Each of the components may be coupled to each other through at least one bus 868. The input/output controller 898 may receive and process input from, or provide output to, a number of other devices 899, including, but not limited to, alphanumeric input devices, mice, electronic styluses, display units, touch screens, signal generation devices (e.g., speakers) or printers.
By way of example, and not limitation, the processor 860 may be a general-purpose microprocessor (e.g., a central processing unit (CPU)), a graphics processing unit (GPU), a microcontroller, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a controller, a state machine, gated or transistor logic, discrete hardware components, or any other suitable entity or combinations thereof that can perform calculations, process instructions for execution, and/or other manipulations of information.
In another implementation, shown as 840 in FIG. 10, multiple processors 860 and/or multiple buses 868 may be used, as appropriate, along with multiple memories 862 of multiple types (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core).
Also, multiple computing devices may be connected, with each device providing portions of the necessary operations (e.g., a server bank, a group of blade servers, or a multi-processor system). Alternatively, some steps or methods may be performed by circuitry that is specific to a given function.
According to various embodiments, the computer system 800 may operate in a networked environment using logical connections to local and/or remote computing devices 820, 830, 840, 850 through a network 810. A computing device 830 may connect to a network 810 through a network interface unit 896 connected to the bus 868. Computing devices may communicate communication media through wired networks, direct-wired connections or wirelessly such as acoustic, RF or infrared through an antenna 897 in communication with the network antenna 812 and the network interface unit 896, which may include digital signal processing circuitry when necessary. The network interface unit 896 may provide for communications under various modes or protocols.
In one or more exemplary aspects, the instructions may be implemented in hardware, software, firmware, or any combinations thereof. A computer readable medium may provide volatile or non-volatile storage for one or more sets of instructions, such as operating systems, data structures, program modules, applications or other data embodying any one or more of the methodologies or functions described herein. The computer readable medium may include the memory 862, the processor 860, and/or the storage media 890 and may be a single medium or multiple media (e.g., a centralized or distributed computer system) that store the one or more sets of instructions 900. Non-transitory computer readable media includes all computer readable media, with the sole exception being a transitory, propagating signal per se. The instructions 900 may further be transmitted or received over the network 810 via the network interface unit 896 as communication media, which may include a modulated data signal such as a carrier wave or other transport mechanism and includes any delivery media. The term “modulated data signal” means a signal that has one or more of its characteristics changed or set in a manner as to encode information in the signal.
Storage devices 890 and memory 862 include, but are not limited to, volatile and non-volatile media such as cache, RAM, ROM, EPROM, EEPROM, FLASH memory or other solid state memory technology, disks or discs (e.g., digital versatile disks (DVD), HD-DVD, BLU-RAY, compact disc (CD), CD-ROM, floppy disc) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the computer readable instructions and which can be accessed by the computer system 800.
It is also contemplated that the computer system 800 may not include all of the components shown in FIG. 10, may include other components that are not explicitly shown in FIG. 10, or may utilize an architecture completely different than that shown in FIG. 10. The various illustrative logical blocks, modules, elements, circuits, and algorithms described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application (e.g., arranged in a different order or partitioned in a different way), but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
By way of definition and description supporting the claimed subject matter, preferably, the present invention includes communication methodologies for transmitting data, data packets, messages or messaging via a communication layer. Wireless communications over a network are preferred. Correspondingly, and consistent with the communication methodologies for transmitting data or messaging according to the present invention, as used throughout this specification, figures and claims, wireless communication is provided by any reasonable protocol or approach, by way of example and not limitation, Bluetooth, Wi-Fi, cellular, zigbee, near field communication, and the like; the term “ZigBee” refers to any wireless communication protocol adopted by the Institute of Electronics & Electrical Engineers (IEEE) according to standard 802.15.4 or any successor standard(s), the term “Wi-Fi” refers to any communication protocol adopted by the IEEE under standard 802.11 or any successor standard(s), the term “WiMax” refers to any communication protocol adopted by the IEEE under standard 802.16 or any successor standard(s), and the term “Bluetooth” refers to any short-range communication protocol implementing IEEE standard 802.15.1 or any successor standard(s). Additionally or alternatively to WiMax, other communications protocols may be used, including but not limited to a “1G” wireless protocol such as analog wireless transmission, first generation standards based (IEEE, ITU or other recognized world communications standard), a “2G” standards based protocol such as “EDGE or CDMA 2000 also known as 1×RTT”, a 3G based standard such as “High Speed Packet Access (HSPA) or Evolution for Data Only (EVDO), any accepted 4G standard such as “IEEE, ITU standards that include WiMax, Long Term Evolution “LTE” and its derivative standards, any Ethernet solution wireless or wired, or any proprietary wireless or power line carrier standards that communicate to a client device or any controllable device that sends and receives an IP based message. The term “High Speed Packet Data Access (HSPA)” refers to any communication protocol adopted by the International Telecommunication Union (ITU) or another mobile telecommunications standards body referring to the evolution of the Global System for Mobile Communications (GSM) standard beyond its third generation Universal Mobile Telecommunications System (UMTS) protocols. The term “Long Term Evolution (LTE)” refers to any communication protocol adopted by the ITU or another mobile telecommunications standards body referring to the evolution of GSM-based networks to voice, video and data standards anticipated to be replacement protocols for HSPA. The term “Code Division Multiple Access (CDMA) Evolution Date-Optimized (EVDO) Revision A (CDMA EVDO Rev. A)” refers to the communication protocol adopted by the ITU under standard number TIA-856 Rev. A.
It will be appreciated that embodiments of the invention described herein may be comprised of one or more conventional processors and unique stored program instructions that control the one or more processors to implement, in conjunction with certain non-processor circuits, some, most, or all of the functions for the systems and methods as described herein. The non-processor circuits may include, but are not limited to, radio receivers, radio transmitters, antennas, modems, signal drivers, clock circuits, power source circuits, relays, current sensors, and user input devices. As such, these functions may be interpreted as steps of a method to distribute information and control signals between devices. Alternatively, some or all functions could be implemented by a state machine that has no stored program instructions, or in one or more application specific integrated circuits (ASICs), in which each function or some combinations of functions are implemented as custom logic. Of course, a combination of the two approaches could be used. Thus, methods and means for these functions have been described herein. Further, it is expected that one of ordinary skill in the art, notwithstanding possibly significant effort and many design choices motivated by, for example, available time, current technology, and economic considerations, when guided by the concepts and principles disclosed herein, will be readily capable of generating such software instructions, programs and integrated circuits (ICs), and appropriately arranging and functionally integrating such non-processor circuits, without undue experimentation.
Analyses
Together, these variables are analyzed to identify health conditions or to predict a person's risk of cognitive decline. An olfactory function assessment is performed and the results compared against an appropriate population database. By way of example and not limitation, a 60-year old female would be assessed on her odor detection ability of cinnamaldehyde. Her quantified ability to detect a given concentration of cinnamaldehyde would be analyzed and compared against other 60-year old females, her own threshold at a younger age, and/or a combination of other 60-year old females, the 60-year old females' threshold at a younger age, and her own threshold at a younger age. The analysis is selected from, by way of example and not limitation, discriminate, regression, or mixed model, and the comparison appears as, by way of example and not limitation, a percent rank or variance from the population mean.
In a preferred embodiment individual olfactory measures for odor detection/sensitivity, odor identification, odor discrimination, and odor adaptation are compared with longitudinal results from the same individual or from the same demographic comparison group to compute a numerical metric of function (Olfaxis Index). Thus, a variety of Olfaxis Indices are preferably utilized in the present invention: sensitivity metric (S-Olfaxis Index), odor identification metric (ID-Olfaxis Index), an individual sensitivity metric (Ind-Sensitivity Olfaxis Index), a threshold metric (T-Olfaxis Index), etc. These metrics are preferably used to determine functional status.
Preferably, the odor identification metric (ID-Olfaxis Index), or identification performance, is measured by presenting between a minimum of 6 individual odors and a maximum of 25 individual odors to the individual. Preferably, the individual is given a list of possible odors to choose from for each individual odor presented to the individual user. In one embodiment, the list is a list of 4 possible odors. In another embodiment, the individual is not given a list of possible odors to choose from. In one embodiment, a plurality of odors is mixed and the individual identifies as many of the plurality of odors in the odor mixture as possible.
In one embodiment, assessment to obtain data for calculating a sensitivity metric (S-Olfaxis Index), an individual sensitivity metric (Ind-Sensitivity Olfaxis Index), and/or a threshold metric (T-Olfaxis Index) is performed by testing an individual at a high concentration of an odorant in a carrier gas and lowering the concentration of the odorant in the carrier gas serially through repeated tests until the individual does not recognize that an odorant is present or until the individual cannot identify the odor produced by the odorant. In another embodiment, an assessment is performed by testing an individual at a low concentration of an odorant in a carrier gas and raising the concentration of the odorant in the carrier gas serially through repeated tests until the individual recognizes that an odorant is present or until the individual can identify the odor produced by the odorant. In yet another embodiment, an assessment is performed using one or more odorants at standard or predetermined concentrations and an individual is asked to identify the odor produced from the one or more odorants. Preferably, the individual is given a list of odors to choose the one or more odorants from.
A given assessment preferably reveals where a person fits on at least one cohort or otherwise related population distribution. A given set of longitudinal assessments, wherein longitudinal assessments are more than one assessment over time, reveal how the olfactory functions of a person compares to appropriate populations for a given odor over a given period of time.
In one embodiment, an Olfaxis Index is calculated by dividing data obtained from a current assessment of an individual to data obtained by a past assessment of the individual or by data obtained by past assessments of a suitable normalized population distribution. In one embodiment, the data is a minimum concentration of odorant in a carrier gas necessary to obtain a positive response from the individual. In another embodiment, the data is the number of odors correctly identified by the individual. In another embodiment, the data is a percentage of odors correctly identified by the individual. In one embodiment, the positive response is an acknowledgment of a presence of an odor. In another embodiment, the positive response is an identification of the odor present.
An individual's threshold metric is preferably calculated by giving an assessment to the individual for his or her smelling ability and comparing the assessment of the individual to one or more past assessments of the individual and/or to past assessments of a suitable demographic population. For example, an individual receives an assessment for his or her smelling ability, wherein the analysis and results reveal that individual's threshold sensitivity is four times the mean of the appropriate normalized population distribution, yielding a metric (Olfaxis Index) of 0.25. If in a set of longitudinal assessments that individual continues to score an Olfaxis Index of 0.25, or for an example 2 standard deviations below the mean, then further medical or cognitive examination may not be warranted, because the individual only has a poor odor detection ability without predicted cognitive decline. Preferably, this analysis is automated.
In another example, if individual A had odor sensitivity measured today, his performance could be compared with the same measure made 12 months ago. If the measures are the same, his sensitivity metric (S-Olfaxis Index would be 1.0). If his odor sensitivity for the same odorant was decreased, and his threshold was twice what it was 1 year ago, his sensitivity metric (S-Olfaxis Index) for the odorant would be 0.5.
In yet another example, if individual A had odor identification performance measured today, his performance could be compared with the same measure made 12 months ago. If the measures are the same, his odor identification metric (ID-Olfaxis Index would be 1.0). If his ID for same odorant was decreased, and his odor ID score was half what it was 1 year ago, his odor ID metric (ID-Olfaxis Index) for the odorant would be 0.5.
In another example, if the individual has undergone a single olfactory test, the results are preferably compared against the database for appropriate demographic population. If the individual's thresholds are three times higher than the comparison demographic threshold, the metric (Ind-Sensitivity Olfaxis Index) will be 0.333.
In another example, an individual's threshold for two odorants might be quantitatively compared to compute an objective metric of function. In this embodiment, an odorant that activates the trigeminal nerve (ex: carbon dioxide) might be used as a standard, against which changes in olfactory nerve function (ex: for vanillin odorant) might be quantified (T-Olfaxis Index).
In another embodiment, an individual's performance on different olfactory tests constructed to measure olfactory performance at different levels within the olfactory central nervous system might be compared to identify the pathological brain region. Odor thresholds may reflect the functional status of olfactory receptors in the olfactory epithelium. Olfactory discrimination measures may reflect functional condition of the olfactory bulb. Odor adaptation measures function of the olfactory receptor in the epithelium and in the piriform cortex. Olfactory identification measures may reflect functional condition of the piriform cortex or prefrontal cortex.
Comparison of each of these measures with comparable measures from the appropriate demographic population would generate a metric indicating the level in the central nervous system affected by mental/physical health problems or neurological disorder. For example, if odor threshold was normal (Olfaxis Index of 1.0), and odor discrimination had an Olfaxis Index of 1.0, but Odor ID had an Olfaxis Index of 0.2, then the individual might be referred for MRI and cognitive testing.
A decline in odor detection ability is known to accompany physiological ageing, senility, and other health conditions. Therefore, a set of population distributions within the population database would reveal a hyposmic shift with age of a specific population, such as male, away from a normal or pre-senile population. This hyposmic shift would happen at a mean rate over a given set of years: The hyposmic shift in 10-year increments reveals ageing population progression below the normal, pre-senile population mean as shown in FIG. 8, for example, at 40, 50, and 60 years of age. This rate of physiological decline is preferably assessed for a number of odorants.
However, if in an example set of longitudinal assessments that same individual progressively scores 0.8, 1.0, 1.2, and 1.5 standard deviations below the mean for a cohort or otherwise appropriate population, then further cognitive examination or health evaluation may be warranted, since declining odor detection ability relative to an appropriate population is strongly correlated with cognitive decline. Evaluating how an individual person's odor detection ability changes over time relative to the population is more important for the purposes of predicting cognitive decline than how that individual compares to a given population at a given time.
A comparison against the physiological ageing decline in odor detection of a given odor or mixture of odors is thus used to detect a decline in pathological odor detection. For example, as shown in FIG. 7A-C, if the individual's results 71 shift hyposmically at a faster rate than that of physiological ageing (independent of initial assessment), then a preliminary diagnosis of cognitive decline is made.
Analysis of the combined population database and the medical history of the testers provides for the identification of predictive or pathognomonic odor losses or patterns of odor losses. These odors can then be used in early-screening tests to reverse, prevent, or slow down disease progression.
Reaction time (RT) can also be used as an indicator of stimulus salience. For example, if the concentration is very high and therefore very obvious or salient to the animal/person, the reaction time is very brief. If the concentration is very low and near threshold, the reaction time is relatively long. Therefore, the detector is designed, configured, and constructed to measure the reaction time of the test subject.
Olfactory Pathway Analysis
A preferred use of the present system is determining where in the olfactory system pathway a decline in odor detection, adaptation, discrimination and/or identification exists. The olfactory system pathway consists of receptors at the epithelium in the nose, the olfactory bulb, the piriform cortex, and the prefrontal cortex. The receptors detect when an odor is present. The olfactory bulb discriminates between odors and whether the odor stems from a pure or mixed odor. The piriform cortex and prefrontal cortices identify (or name) the odorant associated with the pure or mixed odor. Odor adaptation occurs both in the olfactory receptors and in the piriform cortex. Identifying which link in the olfactory system pathway declines preceding cognitive decline has been difficult. Resolving this difficulty is possible with a method of the present invention. Population distributions are generated for at least one odor at each link in the olfactory system using the different olfactory measures (detection, discrimination, adaptation and odor identification). Next, an individual is tested with a pure or mixed odor to target each link in the olfactory system. The test results are then compared to an appropriate population to compute a level metric (Olfaxis Index). Thus, when an assessment is performed, analyzed, and compared to a population distribution, the metric results indicate where in the olfactory central nervous system decline exists. The assessment is also compared longitudinally with a subject's own data in one embodiment. This early and precise detection, along with medical history and demographic information, enables earlier diagnosis and more efficacious therapy to prevent, reverse, or slow the rate of cognitive decline or other health conditions such as diabetes.
A preferred test using the present system is for testing odor detection sensitivity, wherein the odor concentration is serially increased or decreased to identify a person's limit of detection for the specific odorant used. The individual's test data for the specific odorant are compared against the specific odorant's population distribution within the appropriate population database to compute a sensitivity metric (Olfaxis Index). The comparison allows discrimination of smelling ability between persons. Further, a concentration threshold for a specific odorant or mixture of odorants is then generated for the individual.
Further, testing qualifies a person's smelling ability by stratifying concentration thresholds into categories, such as, by way of example and not limitation, very poor, poor, average, good, and very good. The categories may also include the Olfaxis Index of the present invention. Preferably, the sensitivity metric (Olfaxis Index) is determined using a ratio of threshold for an olfactory odor (which would change with age and pathology) to a trigeminal odorant (which may or may not change). The trigeminal odorant is operable to serve as an in person control against which the changed olfactory odorant could be compared.
The database and analyses of the present invention can support pharmaceutical clinical trials. A pharmaceutical's efficacy is measured by a person's improvement in smelling ability.
Kiosk
The present invention can also be provided as a kiosk in such places as health clubs, medical offices and any other location that could benefit from self-testing of olfactory abilities by many persons. The kiosks are preferably preprogrammed with testing protocols and provide test results that are uploaded anonymously to the population database.
Applications
Numerous applications exist for the systems and methods of the present invention. Most prominent is the area of cognitive assessment, as previously discussed. Other applications include gaming, market research and occupational screening and training.
Games
Various possible types of games exist that utilize the present invention, including odor puzzles, odor rankings, and odor memory.
Create a Recipe—A game that combines odor puzzles with odor rankings is a game to create a recipe (complex odorant). The game includes the following steps: a player is given at least one odor; the player adds complementary odors, then shares the “recipe” with a social network without revealing the components. Social networkers smell the blend of odors, try to guess the components and rate the “recipe”. Data are uploaded into an ad hoc database and each social networker then is compared to the ad hoc population database.
Mix—In this game the components of a complex odorant are added sequentially until the player can identify the complex odorant.
Unmix—In this game a masked common odorant is provided. Players attempt to guess the common odorant as they remove masking odors. Masking odors are removed until they can identify the common odorant.
Market Research
While market research for consumer preferences is known in the art, the systems and methods of the present invention enable and facilitate this research. Various types of information are obtained, especially the detection, discrimination, identification and adaptation abilities for individual odors sorted by demographics, such as ethnicity and age.
“What Does It Need?”—This is a game that combines market research with social network gaming. Market researchers provide a base recipe with at least one missing ingredient to a social network. Players attempt to find the best ingredient(s) to add. Responses are uploaded to an ad hoc database, rated by the social network, and individual rankings reported back to the players. The results are used by the market researchers to formulate new products.
Odor Detection Assessment and Training
The system of the present invention is used to train an individual's ability to detect specific odors, as shown in FIG. 6. In one embodiment, specific odors include those that are critical to safety. By way of example and not limitation, an individual is trained to detect thiols, so that he or she is able to detect a natural gas leak. Other critical odors include those associated with food spoilage, such as yeast, mold, or bacteria-mediated odors. Thus, the present invention is used to ensure that elderly persons are safe to be left alone. Additionally or alternatively, by way of example and not limitation, applications of the odor detection assessment systems and methods of the present invention are useful for application by insurers to screen applicants for health coverage; by employers to verify training, by military to track effects of training and/or combat, and/or to determine if an elderly or disabled person is safe left alone (able to detect spoilage, gas, smoke, etc.).
Numerous occupations require that persons be able to detect low levels of certain odors, or, conversely, not smell low levels of certain odors. For example, many biological processes have highly variable starting ingredients and therefore require that the worker be able to sense when a process is complete. In the context of wine, detecting presence of one odorant in a complex, or one volatile in the wine, is a skill useful or even required for sommeliers. The ability to smell the completion of a process can thus be important. Therefore, the need exists for workers to be screened and/or trained for their detection level of certain odors, as well as their ability to discriminate and identify the odors when in a complex mixture or masked. An example application is coffee bean roasting. Because of the variability in bean content, the roasting process to achieve optimum aroma and reduce undesirable odors due to charring is variable, and therefore the roaster needs to be able to 1) detect and identify at very low concentrations the odors that signal the onset of charring and 2) adapt to roasting odors in order to detect the completion of roasting. The ability to quickly and inexpensively screen and further train these workers satisfies this long-standing, unmet need and results in better coffee.
Method for Assessing Olfactory System Odor Detection Ability to Predict Cognitive Impairment.
The present invention is also directed to a method for assessing olfactory system odor detection ability to predict the onset of, or be used in conjunction with other medical testing to diagnose cognitive impairment, diabetes, traumatic brain injury, ALS, Parkinson's, Alzheimer's, general non-neurodegenerative diseases, general ailments, and the like. The method of the present invention provides for assessing the odor detection, discrimination and identification ability of a human, wherein the results of the assessment are analyzed against an appropriate population database, including demographic databases, medical history databases and the like. Preferably, the results are also added to the appropriate database. The database contains at least one population distribution, wherein a distribution describes a human population's ability to detect, discriminate between, and/or identify odors.
The data delivered to a system computing device for analyses and storage is preferably first anonymized. The anonymized data, preferably edited to conform to HIPAA regulations, are aggregated to provide population distributions.
FIG. 11 shows a flow diagram illustrating an example method according to the present invention. This method, which is for determining the degradation of olfactory performance over time, starts by determining the baseline detection level of a person, then determining the detection level over time. The changes in detection level are normalized to a healthy cohort population change to determine the performance status of the tested person.
The above-mentioned examples are provided to serve the purpose of clarifying the aspects of the invention and it will be apparent to one skilled in the art that they do not serve to limit the scope of the invention. By way of example, the system can identify areas needing critical odor training using analytics and/or rules engines. Further, by way of example and not limitation, the cartridge is provided with at least one microprocessor having a memory for programming for command and control of the settings of the olfactometer device based upon the particular odorant(s) within the cartridge, so that the olfactometer device automatically provides the correct airflow, etc. for the selective actuation of the predetermined odorant(s) within the cartridge. All modifications and improvements have been deleted herein for the sake of conciseness and readability but are properly within the scope of the present invention.

Claims

1. A method for testing olfactory system function, comprising

providing a cartridge-based olfactometry system;

providing a puncture-activated, non-resealable cartridge with an odorant and a headspace, the cartridge standardized to provide a predetermined number of tests at a predetermined concentration into the olfactometry system;

inserting the cartridge in the olfactometry system and activating it; and

testing an organism.

2. The method of claim 1, wherein the olfactometry system further includes an extra headspace cartridge and the method steps include recirculating the headspace gas between the odorant cartridge and the extra headspace cartridge.

3. The method of claim 1, further including the step of the olfactometry system detecting the concentration of the odorant in the headspace of the odorant cartridge.

4. The method of claim 1, wherein the olfactometry system further includes a cartridge identifier reader and the odorant cartridge includes an identifier; the method steps include the olfactometry system reading the identifier and adjusting the gas flow through the cartridge based on the information from the identifier.

5. The method of claim 1, wherein the olfactometry system further includes:

a computing device operable to communicate over a network; and

a remote database accessible by the computing device over the network; and

wherein the computing device receives test results, stores them in the remote database, and compares them with test results stored in the remote database.

6. The method of claim 5, wherein the olfactometry system includes multiple, geographically distributed testers in real-time communication with the database and the method steps include the database updating in real-time with test results from the distributed testers.

7. A method for testing olfactory system function, comprising:

determining a present minimum concentration of an odorant in a carrier gas needed in an odorant containment structure to obtain a present positive response to the odorant;

creating an olfaxis composite index based on the present minimum concentration of the odorant in the carrier gas needed in the odorant containment structure to obtain the present positive response to the odorant, wherein the olfaxis composite index is created by:

dividing a past minimum concentration of the odorant in the carrier gas needed in the odorant containment structure to obtain a past positive response by the present minimum concentration of the odorant in the carrier gas needed in the odorant containment structure to obtain the positive response to the odorant, or

dividing an average past minimum concentration of the odorant in the carrier gas needed in the odorant containment structure to obtain past positive responses by the present minimum concentration of the odorant in the carrier gas needed in the odorant containment structure to obtain the positive response to the odorant.

8. The method of claim 7, wherein determining the present minimum concentration of the odorant in the carrier gas needed in the odorant containment structure to obtain the present positive response to the odorant includes:

providing a predetermined concentration of the odorant in the carrier gas using a carrier gas assembly and an olfactory measurement apparatus;

delivering the predetermined concentration of the odorant in the carrier gas from the olfactory measurement apparatus to the odorant containment structure;

determining the present positive response to the odorant or a present negative response to the odorant at the predetermined concentration of the odorant;

if the present negative response to the odorant is determined, providing at least one sequential predetermined concentration of the odorant in the carrier gas using the carrier gas assembly and the olfactory measurement apparatus until the present positive response is determined, wherein the at least one sequential predetermined concentration of the odorant in the carrier gas is an increased concentration of the odorant in the carrier gas compared to the predetermined concentration of the odorant in the carrier gas; and

upon determining the present positive response, determining the predetermined concentration of the odorant in the carrier gas or the at least one sequential predetermined concentration of the odorant in the carrier gas to be the present minimum concentration of the odorant in the carrier gas.

9. The method of claim 7, wherein the present positive response to the odorant is given by a user and wherein the past positive response is given by the user.

10. The method of claim 7, wherein the present positive response to the odorant is given by a user, and wherein the past positive responses are given by a demographic population having similar age, weight, gender, socioeconomic status, ethnicity, height, genetic predispositions, existing health conditions, and/or combinations thereof to the user.

11. An apparatus for producing a predetermined concentration of an odorant comprising:

a main inlet;

a main outlet;

a piston assembly including a piston, a piston shaft, and a carrier chamber;

a linear potentiometer;

a mixing chamber;

a scent reservoir;

a carrier gas inlet valve controlled by a carrier gas inlet solenoid;

a mixture outlet valve controlled by a mixture outlet solenoid;

an odor inlet valve controlled by an odor inlet solenoid; and

a mixing chamber valve controlled by a mixing chamber solenoid,

wherein upon opening of the carrier gas inlet valve, carrier gas flows into the apparatus from a carrier gas assembly;

wherein upon opening of the odor inlet valve, the carrier gas flows into the scent reservoir to mix with an odorant in the scent reservoir to create a concentration of odorant in the carrier gas;

wherein upon retraction of the piston, the piston assembly is operable to receive the concentration of odorant in the carrier gas up to the point of retraction of the piston;

wherein upon opening of the mixture outlet valve, opening of the mixing chamber valve, and reverse retraction of the piston, the piston assembly is operable to force the concentration of odorant in the carrier gas through the mixing chamber and out of the main outlet of the apparatus.

12. The apparatus of claim 11, further comprising a linear potentiometer for controlling movement of the piston.

13. The apparatus of claim 11, further comprising an ultrasonic transducer for activating the odorant in the scent reservoir.

14. The apparatus of claim 11, further comprising a photoionozation detector (PID) for measuring the concentration of odorant in the carrier gas.

15. The apparatus of claim 11, wherein the carrier gas inlet valve, the mixture outlet valve, the odor inlet valve, and the mixing chamber valve each include an o-ring for creating an air-tight seal when closed.

16. A system for assessing, analyzing, and quantifying olfactory system function comprising:

at least one olfactory measurement apparatus comprising:

a system controller, a carrier gas assembly comprising a first piston assembly, an odorant gas assembly comprising a second piston assembly, at least one odorant detector, a mixer coupled to the first piston assembly and the second piston assembly, a reader and an output configured to couple to a nasal delivery device,

wherein the reader is configured to electronically obtain information from an odorant source device, wherein the system controller is in communication with the reader and is configured to electronically direct the at least one olfactory measurement apparatus to run a test sequence using different defined concentrations of one or more odorant from the odorant source device for delivery to the output based, at least in part, on to the obtained information, and wherein the at least one odorant detector measures a concentration of odorant in a respective at least one olfactory measurement apparatus; and

a remote database configured to obtain test data from the at least one olfactory measurement apparatus over a computer network.

17. The system of claim 16, wherein the system controller directs a linear actuator coupled to the second piston assembly to move at a controlled speed and/or move a defined distance to provide a defined volume of an odorant gas of a respective odorant in the second piston assembly, then directs the second piston assembly to discharge the defined volume to the mixer.

18. The system of claim 17, wherein the system controller directs a linear actuator coupled to the first piston assembly to move at a controlled speed to provide a carrier gas to the mixer, and wherein, during one or more test sequences, the system controller directs the first and second linear actuators to move to provide adjustable and controlled concentrations of a respective odorant in an odorant and carrier gas mixture that is fluidly directed to the output.

19. The system of claim 16, further comprising a first linear actuator coupled to the first piston assembly and a second linear actuator coupled to the second piston assembly, wherein the system controller controls distance and/or velocity of movement of the first and second linear actuators to provide controlled adjustable concentrations of odorant in odorant gas and carrier gas mixtures for the test sequence.

20. The system of claim 16, wherein the system is configured to generate an olfaxis composite index derived from different olfactory measures based on the test data.