Manual fluid dispenser with discharge measurement
A dispensing apparatus including a product dispenser in which product is dispensed by manual movement of an activation mechanism as, for example, by moving a lever with a person's hand, arm or foot. The dispensing apparatus includes an electrical generator for generating electrical energy as a result of the manual movement of the activation mechanism, preferably by electromagnetic induction, electrochemistry or piezoelectricity. The electrical energy from the generator may be utilized in the dispensing apparatus to power a data communication unit for receiving information about the product dispenser and transmitting the information to a receiver, preferably but not necessarily wirelessly. The relative amounts of electrical energy generated may be used to estimate the amount of fluid dispensed and the extent to which a fluid reservoir is full.
1. A method of operation of a fluid dispensing apparatus,
the fluid dispensing apparatus comprising:
a fluid containing reservoir,
a dispensing mechanism which on activation causes fluid to be discharged from the from the reservoir,
an activation mechanism for activation of the dispensing mechanism by movement of the activation mechanism,
the activation mechanism adapted for engagement by a user to move activation mechanism,
an electrical generator for generating electric energy,
the electrical generator coupled to the activation-mechanism such that on movement of the activation-mechanism the generator generates electrical energy,
the method comprising the steps of:
(a) moving the activation-mechanism by the user to discharge fluid with the dispensing apparatus and to generate electrical energy with the generator:
(b) measuring at least one feature of the energy generated to produce a measured result, which feature is selected from the group consisting of a feature of the current of the energy generated, a feature of the voltage of the energy generated, a feature of the energy generated and combinations thereof, and
(c) estimating as a function of said measured result for the feature an estimated amount of fluid discharged,
wherein for a given each step (a) carrying out step (b) to produce a measured result for step (a) and then carrying out step (c) to estimate an estimated amount of fluid discharged for the given step (a), and
a step (d) of comparing the estimated amount of fluid discharged for the given step (a) to a predetermined minimum dose volume, and providing a signal indicative of whether the estimated amount of fluid discharged for the given step (a) is: (i) less than the predetermined minimum dose volume or (ii) at least equal to the predetermined minimum dose volume.
2. The method of claim 1 wherein said function comprises a predetermined relationship between values for the measured result for the feature and estimates of the volume of fluid discharged.
3. The method of claim 2 wherein the predetermined relationship is determined by operating a test dispenser the same as or comparable to the fluid dispensing apparatus in a calibration test including a plurality of said steps (a) and for each step (a), performing step (b) and a step (x) of measuring the amount of fluid discharged in each step (a), and establishing the function, as a mathematical relation approximating the relationship covering all test steps (a) between the measured result for the feature for each test step (a), and the measured amount of fluid discharged for each test step (a).
4. The method of claim 1 including determining when the reservoir first has fluid dispensed therefrom, after determining when the reservoir first has fluid dispensed therefrom, repeatedly carrying out steps (a) to (c) above, and
calculating a cumulative sum of each estimated amount of fluid discharged after the reservoir first has fluid dispensed therefrom,
comparing said cumulative sum with a predetermined estimated volume of fluid in the reservoir when inserted, and
providing a signal indicative of the amount of fluid remaining in the reservoir based on the comparison of the cumulative sum to the a predetermined estimated volume of fluid in the reservoir before the reservoir first has fluid dispensed therefrom.
5. The method of claim 4 wherein the signal is selected from an audio signal perceptible to a human user, a visual signal perceptible to a human user, an audio and visual signal perceptible to a human user, and an electronic transmission signal.
6. The method of claim 5 wherein the signal is electronic transmission signal, and the method includes transmitting the signal wirelessly to a wireless receiver by use of a data communications unit for transmitting information wirelessly to the wireless receiver and which data communications unit is powered by electrical energy generated in one or more of said step (a).
7. The method of claim 1 including storing electrical energy generated in one or more of said step (a) for use in operation of the apparatus after generation.
8. The method of claim 1 wherein after providing a signal indicative of the estimated amount of fluid discharged for the given step (a) is (i) less than the predetermined minimum dose volume, then after a next step (a) is performed within a preset time period after the given step (a), carrying out step (b) to produce a measured result for the next step (a) and then carrying out step (c) to estimate an estimated amount of fluid discharged for the next step (a), and a step (e) of comparing the sum of the estimated amounts of fluid discharged for the given step (a) and the next step (a) to the predetermined minimum dose volume, and providing a signal indicative of whether the sum is: (i) less than the predetermined minimum dose volume or (ii) at least equal to equal to the predetermined minimum dose volume.
9. The method of claim 1 wherein the signal is selected from an audio signal perceptible to a human user, a visual signal perceptible to a human user, an audio and visual signal perceptible to a human user, and an electronic transmission signal.
10. The method of claim 1 including the step (y) of changing the predetermined minimum dose volume dependant on factors selected from one or more of:
a nature of the fluid being dispensed,
information regarding risk of infection in the environment in which the apparatus is located,
temperature in the environment in which the apparatus is located,
the length of time since fluid was last discharged, and
the length of time since the reservoir initially had fluid dispensed.
11. The method of claim 1 wherein the feature is selected from the group consisting of:
a peak voltage level of the electrical energy generated within a period of time,
a peak current level of the electrical energy generated within a period of time,
a peak rate of generation of electrical energy within a time period,
a summation of voltage of the electrical energy generated within a period of time,
a summation of current of the electrical energy generated within a period of time,
a summation of electrical energy generated within a time period, and
a pulse of one or more of current, voltage or energy of the electrical energy generated,
a duration of a pulse of one or more of current, voltage or energy of the electrical energy generated,
a feature of a pulse of one or more of current, voltage or energy of the electrical energy generated including as measured over time a feature selected from the group consisting of duration, amplitude, and average value.
12. The method of claim 8 wherein the signal is selected from an audio signal perceptible to a human user, a visual signal perceptible to a human user, an audio and visual signal perceptible to a human user, and an electronic transmission signal.
13. The method of claim 8 including the step (y) of changing the predetermined minimum dose volume dependant on factors selected from one or more of:
a nature of the fluid being dispensed,
information regarding risk of infection in the environment in which the apparatus is located,
temperature in the environment in which the apparatus is located,
the length of time since fluid was last discharged, and
the length of time since the reservoir initially had fluid dispensed.