Patent Application
20220097037
A pipette, a pipettor, or a pipet is a hand-held device used to transfer or provide a small and accurate amount of fluids, usually used in chemical and biological laboratories. The pipette is the most basic tool used in each laboratory. Every person who begins to work in the lab, in the framework of studies, research or work, is trained to use a pipette. A number of such pipettors can usually be found in each laboratory. Curranty, there is no organized, consistent and uniform training procedure for use with pipettors and no follow-up for a uniform certification. Each laboratory and each organization train and use pipettors according to their understanding and discretion.
Every procedure in a chemical or a biological laboratory begins with the use of a pipettor. Procedures such as PCR, Elisa crystallography, etc. involve a high-tech systems and very expensive equipment. All these processes begin by manually preparing the sample and working with the pipettors. Many deviations in the results can be prevented by calibrating and checking the pipettor regularly (the recommendation is between once a week to once a month), and by a proper technique for the pipettor use practiced by laboratory employees. Currently, the laboratories do not have a means for calibrating pipettors, and there is no standard guidelines of training of laboratory workers for proper use of pipettor and proper testing for the pipettors. Most laboratories calibrate pipettors once a year, while only a small number of laboratories perform calibration to the pipettors more frequently, such as once a month (e.g. in the field of baby food and pharmaceutical industry). In any event, this scope of calibration is not sufficient to maintain equipment service and as a result, the likelihood of errors and mistakes in the lab's work increases.
There are several factors that affect the quality of the work with pipettors in the laboratory:
There are different methodologies for determining the required calibration level of the pipettors. One of them uses the desired level of reliability and the mean time between failures (MTBF) index to determine how often a calibration is needed. The reliability level describes the percentage of proper pipettors in the lab at a given moment. For example, the meaning of 95% reliability is that at any given time 95% of the pipettors in the laboratory should be normal and calibrated, while only 5% can be malfunctioned.
A laboratory manual calibration of a pipettor is conducted in a controlled temperature environment and under precise working procedures. Usually ten weight measurements are conducted, per three different liquid volumes (10% of the full volume, 50% and 100%), for each pipettor. Total is usually 30 measurements, per a pipettor. The liquid measurement is performed on an accurate weight scale having accuracy of 10−6 gram, usually using a display of 4 to 6 digits. The pipettor's volume is adjusted by rotating the wheel-button, for each of the required liquid volumes. Since the calibrating is conducted manually, there can be a difference in the calibration features between one calibrating employee and to another, even at the same laboratory.
There are many factors that affect manual calibration quality: the equipment, the workspace, hand stability of the calibrating person, grip orientation of the calibrating person (perpendicular or tilted), the warmth of the hand of the calibrating person, fatigue of the calibrating person and environmental conditions (like: temperature, humidity, tip selection, and liquid quality). At the end of the manual calibrating process, the pipette is calibrated and found within the deviation limits permitted by a standard, for example ISO8655, however the process is manual, slow, non-repeatable and requires the preservation of a specific working environment and specific and controlled work conditions. As a result, the calibration process of one pipettor by an experienced calibrator takes approximately 30-45 minutes. The calibration of a multi-channel pipettor takes about 2 to 4 hours. When it comes to a large laboratory having hundreds and thousands of pipettors, the calibration is usually be performed through a company that provides the service to this laboratory and not by the laboratory's staff.
In this context, the exhaustion factor among technicians should be mentioned, dealing with pipettors calibration continuously in a large part of their work day. Technicians in companies providing pipettors calibration services for laboratories, are intensively engaged in manual calibration process. Some of the companies are aware of the cause of exhaustion and limit the number of pipettors calibration per an employee, for one day's work. This is to reduce the effect of exhaustion (fatigue) on the results of the calibration. While most often, the calibration of a pipettor is within the required range, the dispersion of the measurement is too large.
Most of the pipettors in laboratories are in volumes of 20-1000 micro-liters. These pipettors' calibration requires a weight precision of about 10−5 gram. About 15% of the pipettors are 8 multi-channel or 12-multi channel pipettors that are bound together (usually used for a case of plurality of test tubes). About 10% are small pipettors of having a volume of 0.1-20 micro-liter. The calibration of such small pipettors requires a weight scale in the rank of 10−6 gram and requires a touch of the tip with the tool wall or a paper surface, to dispense the liquid drop onto the weight scale.
According to embodiments of the invention, a new pressing-device is provided configured to push a button of a pipette, comprising:
According to some embodiments, the pressing-lever is connected at the proximal-section thereof to the actuating-lever via an axis-pin; and wherein the pressing-lever is connected to the base, via another axis-pin, at a predetermined location of the pressing-lever, configured to provide a predetermined force relation between the force (F1) applied at the proximal section and the force (F2) applied at the distal section.
According to some embodiments, pressing-device the further comprising at least one spring configured to control and/or restrain the motion of the actuating-lever, such that the force (F3), which is applied onto the plugger-button depends on the spring's stiffness coefficient (k) and the spring's deformation length, due to the motion of the actuating-lever According to some embodiments, the distal-section of the pressing-lever further comprises a wheel or a ball in a socket, configured for the temporary communication of the pressing-lever with the button.
According to some embodiments, the actuating-lever comprises a piston-spacer, configured to reduce the amplitude of the actuating-lever's motion.
According to some embodiments, the pressing device is configured to be firmly connected to a robotic arm, as an end effector thereof.
According to some embodiments, the pressing-device further comprises at least one processor, configured to control the actuating-device.
According to some embodiments, the linear actuating-device further comprises an analog location tracker, in communication with the processor, configured to measure the motion of the actuating-lever.
According to some embodiments, the pressing-device further comprising a pressure regulator, in communication with the processor, configured to measure and control the applied force (F1), at the proximal section of the pressing-lever.
According to some embodiments, the pressure regulator is configured to control the applied force (F1) and thereby the applied force (F2 or F3) to push the button to a first stop and/or a second stop thereof.
According to some embodiments, the applied force (F2 or F3) is selected between 0 to 11 Kg.
According to some embodiments, the resolution of the applied force (F2 or F3) is selected between 0.001 to 0.5 Kg.
According to some embodiments, the pressing-device further comprising a gripping-device, firmly connected to the base and configured to firmly and temporarily hold the pipette.
According to some embodiments, the griping-device comprises at least one of:
According to some embodiments of the invention, a new rotating-device is provided configured for turn/dial a button of a pipette, comprising:
According to some embodiments, the coupling-assembly comprises two opposing-sections, the first-section is configured to carry the rotary-motor and at least one of the active-wheels, and the second-section is configured to carry another active-wheel or a passive-wheel, and wherein the coupling-assembly is configured to couple all the wheels from two sides of the button.
According to some embodiments, the coupling-assembly further comprises a compression-spring configured to bring the two opposing-sections one towards the other, and therefore to apply a compression-force onto the button.
According to some embodiments, the coupling assembly further comprises a piston comprising a piston-lever; the piston-lever is located between the two opposing-sections, configured to separate the two opposing-sections, when the piston-lever protrudes out of the piston.
According to some embodiments, the active-wheel and/or the passive-wheel is mounted to the coupling-assembly via a spring/s, configured to allow motion along the axis of the wheel/s.
According to some embodiments, the active-wheel and/or the passive-wheel comprises rubber.
According to some embodiments, the rotating-device further comprising at least one processor configured to control the rotary-motor and/or the coupling-assembly, therefore to control the rotation/dialing of the button.
According to some embodiments, the rotating device further comprising a least one imaging-sensor, in communication with the processor, configured to image digits of a volume indicator of the pipette and optionally its indicated measuring unit, and optionally wherein the processor is further configured to analyze the provided image and to control the rotation of the button, based on the analyzed image, to a predetermined value.
According to some embodiments, the rotating device further comprising illumination element, configured to illuminate the volume indicator.
According to some embodiments, the rotating-device further comprising a gripping-device, firmly connected to the firm base and configured to firmly and temporarily hold the pipette.
According to some embodiments of the invention, a new system is provided configured to automatically calibrate a pipette, comprising:
According to some embodiments, the system is provided within a closed cabin, with an optional exception of at least some of the processors; the cabin is configured to enable environment control there within.
According to some embodiments, the robotic arm comprises at least four rotational degrees of freedom (DOF).
According to some embodiments, the input-device comprises at least one of: a keyboard, a scanner, a touch screen, a microphone, a camera, a temperature sensor, a humidity sensor, a illumination sensor, a water density sensor, a sensor which determines the liquid quantity at the liquid source, the scaling element, an atmospheric pressure sensor, and any combination thereof, configured to collect data about the pipette features and/or the systems features.
According to some embodiments, the input-device comprises at least one imaging-sensor, configured to take image/s of the pipette.
According to some embodiments, the processor is further configured to evaluate a required rotation-angle or dialing, based on a received and analyzed image of digits of a volume indicator and optionally an indicated measuring unit.
According to some embodiments, the system further comprising at least one illumination element, configured to illuminate at least the volume indicator of the pipette.
According to some embodiments, the input-device comprises at least one illumination sensor; and wherein the processor is further configured to control the illumination element.
According to some embodiments, the system further comprising at least one temperature control device, configured to adjust the cabin's temperature and/or the liquid's temperature in the liquid source; the input-device comprises at least one temperature sensor; and the processor is further configured to control the temperature control device to a predetermined temperature.
According to some embodiments, the system further comprising at least one humidity control device, configured to adjust the cabin's humidity; the input-device comprises at least one humidity sensor; and the processor is further configured to control the humidity control device to a predetermined humidity.
According to some embodiments, the input-data comprises at least one of:
According to some embodiments, the system further comprises at least one display device, configured to display the input data and/or the calibration report.
According to some embodiments, the plunger-button and the wheel-button are configured as a single button.
According to some embodiments, the report comprising selected from: pass, fail, need adjustment, check for mechanical malfunction, and combination thereof.
According to some embodiments of the invention, a new method is provided for automatic calibration of at least one pipette using the system according to the above mentioned, the method comprising:
According to some embodiments, the step applying a predetermined rotation angle onto a wheel-button, comprises selecting a liquid volume for the pipette.
According to some embodiments, the step of selecting a liquid volume for the pipette comprises analyzing, via the processor, an image of a volume indicator of the pipette, provided by an imaging sensor.
According to some embodiments, the step of applying a predetermined pressure onto the plunger-button, comprises drawing liquid from the liquid source into the pipette.
According to some embodiments, the step of applying a predetermined pressure onto the plunger-button, comprises dispensing the liquid from the pipette onto the scaling element.
According to some embodiments, the steps of drawing, dispensing, and measuring, are repeated in cycles, for a predetermined number of times, per several predetermined selected liquid volumes; and wherein the step of evaluating is based on a selected collection of the repeated cycles.
According to some embodiments, the selecting of the collection of cycles, is based on statistic tools selected from: standard deviation, measurement random error, measurement uncertainty, etc.
According to some embodiments, the method further comprising at least one step selected from:
According to some embodiments, the method further comprising collecting a pipette from a predetermined location and/or driving out the pipette to a predetermined location, via the controlling of the robotic arm and the pressing device.
The subject matter regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, both as to organization and method of operation, together with objects, features, and advantages thereof, may best be understood by reference to the following detailed description when read with the accompanying drawings in which:
It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements.
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, and components have not been described in detail so as not to obscure the present invention.
The terms “calibrate” and “calibration”, as used herein refers, according to some embodiments, to a process configured to standardize (something, such as a measuring instrument) by determining the deviation from a standard, so as to ascertain the proper correction factors.
The term “firm”, as used herein refers, according to some embodiments, to having a solid or compact structure that resists stress or pressure or force moment. The term “firmly” as used herein refers, according to some embodiments, to securely or solidly fixed in place while resisting stress or pressure or force moment.
The term “end effector”, as used herein refers, according to some embodiments, to a device at the end of a robotic arm, designed to interact with the environment.
According to some embodiments, the term “button” as used herein, can be replaced with the term “knob”.
Reference is now made to
According to some embodiments, the pressing-device 300 comprises:
According to some embodiments, the force (F2) is provided by the linear actuating-device, according to the equivalent force moments, M=F1×R1=F2×R2, therefore the relation is F2=F1×R1/R2. According to some embodiments, R1 is the distance between the proximal-section 351 and the predetermined location 353 and R2 is the distance between the distal-section 352 and the predetermined location 353, as demonstrated in
According to some embodiments, and as demonstrated in
According to some embodiments, and as demonstrated in
According to some embodiments, the pipette is being firmly held by a third party. According to some embodiments, the pipette is being firmly held by the firm base of the pressing-device, optionally via a gripping element.
According to some embodiments, the plunger button applied force F2 or F3 is configured to push the plunger's button towards the plunger, and where the third party or the griping-device, which is connected to the firm base, provides the reaction force to the applied F2 or F3.
According to some embodiment, the linear actuating-device is selected from: linear motion engine, linear servomotor, linear actuator, servo actuator.
According to some embodiments, the distal-section of the pressing-lever 352 or 392 further comprises a wheel 360 or a ball in a socket, via an axis pin 372, configured for the temporary communication of the pressing-lever with the plunger-button. Accordingly, the wheel is configured to apply the force F2 or F3 on to the plunger-button 130. The wheel is configured to allow a motion to the contact point 354 between the pressing-lever's distal section and the plunger-button. Accordingly, for the case of pressing-lever 350 (demonstrated in
According to some embodiments, the linear actuating-lever 341 comprises a piston-spacer 342, configured to reduce the amplitude of the actuating-lever's motion.
According to some embodiments, the pressing device is configured to be firmly connected to a robotic arm 200, as an end effector 210 thereof.
According to some embodiments, the pressing-device further comprises at least one processor 399, configured to control the actuating-device, via a wired—and/or wireless—communication.
According to some embodiments, the linear actuating-device 340 further comprises an analog location tracker 381, in wired and/or wireless communication with the processor, configured to measure the motion of the actuating-lever, optionally its current length and/or location.
According to some embodiments, the pressing-device further comprising a pressure regulator 380, in wired and/or wireless communication with the processor, configured to measure and control the force (F1), applied via the actuating-device 340 on the actuating-lever 341.
According to some embodiments, the pressure regulator 380 is configured to control the actuating-device applied force (F1) and thereby control the force (F2 or F3), which is configured to push the plunger-button to a first stop and/or a second stop thereof. According to some embodiments, the first stop of a plunger-button is configured to allow the drawing of liquid into the pipette vessel and the second stop is configured to allow a dispensing of liquid out of the pipette vessel.
According to some embodiments, the control of the actuating-device is based on input data provided to the processor 399 from at least one of: the pressure regulator 380, analog location tracker 381, and any combination thereof
According to some embodiments, the force applied onto the plunger button (F2 or F3) is selected between: 0 to 11 Kg. According to some embodiments, the resolution of the applied force (F2 or F3) is selected between: 0.001 to 0.5 Kg.
According to some embodiments, the pressing-device further comprising a gripping-device 320, firmly connected to the firm base and configured to firmly and temporarily hold the pipette. According to some embodiments, the griping-device comprises at least one of:
According to some embodiments, the processor/s 399 is/are further configured to control the gripping-device 320, via wired—and/or wireless—communication.
Reference is now made to
According to some embodiments, the turn or dial the wheel-button is configured to modify the volume of the pipette vessel.
According to some embodiments, the pipette is being firmly held by a third party, optionally via a gripping element. According to some embodiments, the pipette is being firmly held by the firm base of the rotating-device, optionally via a gripping element, similar to the above mentioned gripping-device.
According to some embodiments, the coupling assembly allows a linear motion to the first-wheel in a direction which is perpendicular to its axis, as demonstrated in
According to some embodiments, the application and/or removal of the force moment respectively onto—and/or off—the wheel-button of the pipette can be controlled be by respectively an activation—and/or deactivation—of the rotary-motor.
According to some embodiments, the coupling-assembly comprises two opposing-sections, both mounted via the rail of the firm base, the first-section 441 is configured to carry the rotary-motor and at least one first-wheel, and the second-section 442 is configured to carry at least one second-wheel 432; and wherein the coupling-assembly is configured to couple both the first-wheel and the second-wheel from two sides of the wheel-button of the pipette.
According to some embodiments, the first-wheel is coupled to the rotary motor (therefore active-wheel) and the second-wheel 432 is a free rolling wheel (therefore passive-wheel), which is not connected to any actuator, but can roll by any coupled force and/or moment. According to other embodiments, both the first—and second—wheels are coupled to the rotary motor (active wheels).
According to some embodiments, the coupling-assembly further comprises a compression-spring configured to bring the two opposing-sections 441,442 one towards the other, and therefore to apply a compression-force (in the direction of the red arrows) onto the wheel-button, via the first—and second—wheels, such that the force moment can be applied by the rotary-motor, if activated.
According to some embodiments, when the compression-force is applied, the first-wheel rotates the wheel-button; and the wheel-button rotates the second-wheel. According to other embodiments, both the first—and second—wheels rotate the wheel-button.
According to some embodiments, the coupling assembly further comprises a piston 444 which includes a piston-lever 445, as demonstrated in
According to some embodiments, the first-wheel and/or the second-wheel are mounted to the coupling-assembly via a spring/s, configured to allow motion along the axis of the wheel/s. This motion along the wheel/s axis is configured to allow the wheel/s to move together with the wheel-button, when rotated/dialed and moving up/down relative to the pipette, as demonstrated in
According to some embodiments, the first-wheel and/or the second-wheel comprises rubber or another elastic material configured to at least partially adjust to the shape of the wheel-button being coupled.
According to some embodiments, the rotating-device further comprises at least one processor 499, configured to control via wired—and/or wireless—communication at least one of: the rotary-motor, the coupling-assembly, the gripping element, and any combination thereof; therefore, to control the rotation/dialing of the wheel-button.
According to some embodiments, the rotating-device further comprises a least one imaging-sensor 910, for example cameras at various locations. According to some embodiments, the least one imaging-sensor is in wired—and/or wireless—communication with the processor, configured to image and analyze the digits of a volume indicator 120 of the pipette (for a non-limiting example 4 to 6 digits) and optionally its indicated measuring unit.
According to some embodiments, the processor is further configured to analyze the provided image (digits and units) and to control the rotation of the wheel-button, based on the analyzed image, to a predetermined volume value.
According to some embodiments, the rotating-device further comprises an illumination element 920, configured to illuminate the volume indicator. According to some embodiment, the illumination element is configured with a location, orientation and intensity to provide optimal illumination condition to the display of the volume indicator.
According to some embodiments, the illumination element is in wired—and/or wireless—communication with the processor, and wherein the processor is further configured to analyze the provided image and to control the illumination element, based on the analyzed image.
Reference is now made to
According to some embodiments, the system is provided on a stable table 901, configured to stand still in a direction perpendicular to the gravitational axis; optionally where at least some of the processors are remotely provided (not on the table). According to some embodiments the system is provided within a closed cabin 900, to enable the control of environmental conditions. In certain embodiments, the cabin comprises the stable table, as demonstrated in
According to some embodiments, the processor's evaluation of the calibration comprises a determination of the deviation of the pipette's features from a standard so as to ascertain the proper correction factors. According to some embodiments, the standard can be predetermined, taken from known establishments (for a non-limiting example ISO 8655), and/or determined in real-time, according to user's selection.
According to some embodiments, the processor's output of the calibration comprises phrases such as: Pass, Fail, need Adjustment, Check for mechanical malfunction, and combination thereof. According to some embodiments the output report further comprises current status of the tested pipette, such as: the sensors measured features (temperate, humidity, barometric pressure, the average of the weight measurement). According to some embodiments, the processor is configured to record various parameters of the system, it's devices, and/or the cabin features, such as but not limited to: the applied pressure onto the plunger button (for filling the pipette tip and ejecting the liquid out), and required moment for rotating the wheel-button (for changing pipette's volume).
Non-limited examples for calibration reports are provided in:
According to some embodiments, the robotic arm comprises at least four rotational degrees of freedom (DOF) 201-206.
According to some embodiments, the input-device comprises at least one of: a keyboard (for manual input), a scanner (for bar-code and/or Q-code), a touch screen, a microphone (for voice recognition), a camera, a temperature sensor, a humidity sensor, a illumination sensor, a water density sensor, a sensor which determines the liquid quantity at the liquid source, an atmospheric pressure sensor, the scaling element, and any combination thereof, configured to collect data about the pipette features and/or the systems features.
According to some embodiments, input-device comprises at least one imaging-sensor 910, configured to take image/s of the pipette. According to some embodiments, the processor/s is/are further configured to evaluate a required rotation-angle or dialing, based on a received and analyzed image of the digits of the volume indicator 120, and optionally an indicated measuring unit.
According to some embodiments, the system further comprises at least one illumination element 920, configured to illuminate at least the volume indicator of the pipette. According to some embodiments, the input-device comprises at least one illumination sensor; and wherein the processor is further configured to accordingly control the illumination element, for a non-limiting example: turn on, turn off, adjust illumination intensity and/or color, adjust the orientation of the illumination element, and more.
According to some embodiments, the system further comprises at least one temperature control device, configured to adjust the cabin temperature and/or the liquid temperature in the liquid source; the input-device comprises at least one temperature sensor; and the processor is further configured to control the temperature control device to a predetermined temperature.
According to some embodiments, the system further comprises at least one humidity control device, configured to adjust the cabin's humidity; the input-device comprises at least one humidity sensor; and the processor is further configured to control the humidity control device to a predetermined humidity.
According to some embodiments, the input-data comprises at least one of:
According to some embodiments, the system comprises at least one display device 710 and/or a printing device, configured to display the input data and/or the calibration report.
According to some embodiments, the plunger-button and the wheel-button are configured as a single button, that can be both pushed and rotated or dialed.
According to some embodiments, the system is configured to sequentially calibrate plurality of pipettes, one after the other, by collecting each pipette from a known location, calibrating each pipette, according to at least some of the above mentioned embodiments, returning the pipette to its original location or to another predetermined location, and then moving to collect the following pipette.
Reference is now made to
According to some embodiments, the step of moving the pipette to a predetermined location and/or orientation 2300, comprises loading the pipette with a tip.
According to some embodiments, the step of driving out and releasing the pipette 2800, comprises ejecting the tip from the pipette.
According to some embodiments, the steps loading and ejecting the tip can be provided between several measurements of a specific pipette, meaning loading a new tip before the step of measuring and ejecting the use tip, after the measurement.
According to some embodiments, the step 2400 of applying a predetermined rotation angle onto a wheel-button, comprises selecting a liquid volume for the pipette's vessel. According to some embodiments, the step of selecting a liquid volume for the pipette comprises analyzing, via the processor, an image of a volume indicator of the pipette, provided by an imaging sensor. According to some embodiments, the step of applying rotation angle onto a wheel-button is provided several times for several different volumes.
According to some embodiments, the step 2600 of applying a predetermined pressure onto the plunger-button, comprises applying pressure to a first stop for drawing liquid from the liquid source into the pipette. According to some embodiments, the step 2600 of applying a predetermined pressure onto the plunger-button, comprises applying pressure to a second stop for dispensing the liquid from the pipette onto the scaling element, or onto a container there onto the scaling element.
According to some embodiments, the method further comprising at least one step selected from:
According to some embodiments, the step 2900 of driving out the pipette to a predetermined location, is not necessarily to its original collection point, but to a different location.
According to some embodiments, and as demonstrated in
While certain features of the invention have been illustrated and described herein, many modifications, substitutions, changes, and equivalents will now occur to those of ordinary skill in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IL2020/050066 | 1/15/2020 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 62793471 | Jan 2019 | US |
