Patent Application
20250134498
The present invention relates to devices and methods for collecting and manipulating liquid samples.
Liquid samples, e.g., blood, urine, and saliva, may be subjected to diagnostic assays such as to determine the presence of one or more targets present in the sample or to determine a physio-chemical property of the sample. For example, a sample of blood may be analyzed to determine the amount of glycated hemoglobin (HbAlc) present therein. In connection with performing such assays, steps such as sample collection and processing may be performed. For example, in performing diagnostic assay to determine HbAlc in a blood sample, an amount of blood produced from a fingerstick may be collected and subjected the blood to processing such as by lysing red blood cells therein to render the HbAlc accessible to reagents used in the diagnostic assay.
In embodiments, a method includes contacting a liquid sample with one or more collection apertures of a sample collection annulus to collect a film of the liquid sample within each of the one or more collection apertures. The method may further include inserting the sample collection annulus with the collected liquid sample film(s) into a tubular container through an opening thereof.
In embodiments, the tubular container includes a reagent, e.g., a liquid reagent disposed therein during the step of inserting. In embodiments, the method includes introducing a reagent, e.g., a liquid reagent to the tubular container concurrently with and/or following the step of inserting the sample collection annulus into the tubular container. In embodiments in which the container includes a liquid reagent disposed therein (whether present during the step of inserting or introduced concurrently with and/or following the step of inserting), the step of inserting may include at least partially, e.g., entirely, immersing the sample collection annulus and the collected liquid sample film(s) within the liquid reagent.
In any of the embodiments, the step of contacting may include manipulating, e.g., manually via an operator's fingers, the sample collection annulus with a tubular dispenser secured with respect to the sample collection annulus. The sample collection annulus and the tubular dispenser may be secured with respect to one another, e.g., indirectly by an extending arm. In embodiments, the one or more collection apertures of the sample collection annulus each define a plane and the tubular dispenser defines an internal bore extending along an axis that is generally parallel to the plane of the collection aperture(s).
In any of the embodiments including a liquid reagent, the method may further include dispensing at least some of the liquid and the collected liquid sample from the tubular container through the tubular dispenser.
In any of the embodiments including a liquid reagent, the method may include mixing the liquid reagent and the collected film(s) of liquid sample within the tubular container prior to or concurrently with the step of dispensing.
In any embodiments of the method, the one or more collection apertures may be triangular. In any of the embodiments, the one or more collection apertures of the sample collection annulus having a total area of between about 2 mm2 and 10 mm2, between about 4 mm2 and 8 mm2 e.g., an area of about 4 mm2, of about 5 mm2, about 6 mm2, about 7 mm2, or about 7.6 mm2. In any of the embodiments, the one or more collection apertures of the sample collection annulus have a total volume of between about 4 μl and 12 μl, between about 4 μl and 20 μl, between about 5 μl and 18 μl, between about 7 μl and 16 μl, e.g., about 8 μl, about 10 μl, or about 12 μl or about 13 μl (13 mm3).
In any of the embodiments of the method, the sample collection annulus has a thickness of between about 0.3 mm and 4 mm, between about 0.3 mm and about 2 mm, between about 0.3 mm and about 1 mm, e.g., about 0.5 mm. In any of the embodiments of the method, the sample collection annulus has a maximum thickness and a minimum thickness. The maximum thickness may have any of the aforementioned thickness dimensions and the minimum thickness may be less than about 75%, less than about 65%, less than about 55% or less than about 50% of the maximum thickness.
In any of the embodiments of the method, the sample collection annulus has a height of between about 1 mm and about 3 mm, e.g., between about 1.5 mm and about 2.5 mm, e.g., between about 1.75 mm and about 2.25 mm.
In any of the embodiments of the method, the sample collection annulus has a single collection aperture that defines substantially all, e.g., all, of the area and/or volume of the collection apertures of the sample collection annulus. For example, the sample collection annulus may have a single collection aperture. In any of the embodiments of the method, each of the one or more collection apertures may be open, e.g., free of a grid or mesh extending thereacross.
In any of the embodiments of the method, the method may further include, after the step of inserting the sample collection annulus with the collected liquid sample film(s) into a tubular container through an opening thereof, covering the opening with the sample collection annulus optionally remaining in the tubular container. The step of covering the opening may include covering the opening with a cap having a passage extending therethrough and then dispensing at least some of the collected liquid film(s) and at least some liquid reagent if present from the tubular container through the passage of the cap.
In any of the embodiments of the method, the method may further include, after the step of inserting the sample collection annulus with the collected liquid sample into a tubular container through an opening thereof, covering the opening of the tubular container with a cap having a dispensing passage extending therethrough. The method may further include dispensing at least some of the collected liquid film(s) and at least some liquid reagent if present from the tubular container through the tubular dispenser and through the dispensing passage of the cap.
Further disclosed herein is a system for preparing a liquid sample for an assay including: a sample collection annulus having a collection aperture configured to collect a film of the liquid sample therein; a sample collection arm coupled to the sample collection annulus, the sample collection arm having a top portion and a bottom portion, the top portion detachably secured to the bottom portion, the bottom potion coupled to the sample collection annulus; and a tubular container configured to receive the sample collection annulus and at least the bottom portion through an opening thereof, the tubular container having a chamber therein configured to contain the liquid sample.
The system may further include a dispenser configured to cover the opening of the tubular container, the dispenser having a channel therein that becomes in fluid communication with the chamber when the dispenser covers the opening. The tubular container may include a buffer, e.g., lysis buffer, therein for mixing with the liquid sample. The sample collection annulus may be disposed at an angle with respect to a longitudinal axis of the sample collection arm, e.g., an angle from about 10 degree to about 70 degree, from about 20 degree to about 50 degree, from about 25 degree to about 40 degree, or about 30degree.
In any embodiment of the use of any annulus disclosed herein, a collected liquid sample disposed within the annulus may be removed therefrom without inserting a tool or member, e.g., a plunger, into or through the annulus. For example, the collected liquid sample may be removed by immersing, either partially or entirely, the annulus into another liquid, such as a buffer or other liquid reagent disclosed herein.
With reference to
Tubular container 20 has a base 22 and an access end 24 with an access opening 26 defining a lip 25. Tubular container 20 has a length d1 of about 30 mm. In an upright operating orientation as shown in
Referring also to
In some cases, the sample collection arm 42 and the sample collection annulus 44 are co-linear, such that the sample collection arm and the sample collection annulus extend along the same or substantially the same longitudinal axis. In some cases, the sample collection annulus extends along a longitudinal axis (e.g., annulus axis) that is not co-linear with a longitudinal axis of the sample collection arm (e.g., arm axis). For example, in some cases the annulus axis extends away from the arm axis at an angle from about 0.1 degree to about 90 degree, from about 1 degree to about 75 degree, from about 10 degree to about 50 degree, from about 20 degree to about 40 degree, from about 25 degree to about 35 degree, or about 30 degree. In some embodiments, the transition of the sample collection arm extending along the arm axis to the sample collection annulus extending along the annulus axis occurs at or about the attachment point 52.
Sample collection arm 42 has a length d2 of about 13 mm between attachment points 50,52. Sample collection unit 40 and tubular dispenser 60 are made of a material suitable for manipulating biological samples, e.g., a material having the same or similar composition to the polymer materials of tubular container 20, e.g., polyethylene.
Sample collection annulus 44 has sides 43a, 43b and a base 43c, an outer length d3 of about 5 to 7 mm, and an outer width d4 of about 4 to 5 mm. Each side 43a, 43b and base 43c have a thickness d7 of about 0.4 to 0.6 mm and a height d8 of about 1 to 2 mm, e.g., about 1.75 mm. Sides 43a, 43b meet at a distal terminus 45 of sample collection annulus 44. Sides 43a, 43b define respective inner surfaces 43a′, 43b, and base 43c defines an inner surface 43c′. Together, inner surfaces 43a′, 43b′, 43c′ define a sample collection aperture 48 therebetween. Sides 43a, 43b, 43c generally define a plane perpendicular to an axis a1 extending through aperture 28. Each inner surface 43a′, 43b′ of respective side 43a, 43b has a length d5 of about 4 mm to about 5 mm, e.g., about 4.75 mm. Inner surface 43c′ of side 43c has a length d6 of about 2.5 to 5 mm, e.g., about 4.2 mm. Sample collection aperture 48 has an area (½×d5×d6) from about 6 mm2 to about 8 mm2 and a volume (½×d5×d6×d8) from about 11 μl (11 mm3) to about 16 μl (16 mm3), e.g., about 13.3 μl (13.3 mm3). A ratio of the area (in mm2) to the height d8 (in mm) of aperture 48 (area: height) is from about 3 to about 8, e.g., about 4.3. A ratio of the area (in mm2) to the volume (in mm3) of aperture 48 (area: volume) is from about 0.3 to about 0.7, e.g., about 0.6. A ratio of the volume of lysis buffer 27 to the volume of aperture 48 (vol. buffer: vol. aperture) is from about 5 to about 20.
Tubular dispenser 60 includes a tubular wall 61 defining an internal bore extending along an axis a2 between an input opening 62 and a dispensing opening 64. Axis a2 of the bore of tubular wall 61 is generally parallel to the plane defined by the sides of sample collection annulus 44 and is perpendicular to axis a1 extending through aperture 48 of sample collection annulus 44. Tubular wall 61 has an elliptical cross-section along a dimension perpendicular to the longitudinal axis of the internal bore with opposed major surfaces 63a, 63a′ and opposed minor surfaces 63b, 63b′. Tubular wall 61 has a constant thickness of about 500 μm and a major external width w1 with a maximum of about 5.8 mm and a minor external width w2 with a maximum of about 2.8 mm. The internal bore of tubular wall 61 has a length d9 of about 20 mm between openings 62,64 and tapers from a maximum internal diameter of about 5.5 mm adjacent input opening 62 to a minimum internal diameter of about 1.8 mm adjacent dispensing opening 64. Tubular member 61 is composed of a flexible polymer so that major surfaces 63a, 63a′ can be compressed by an operator's fingers to dispense a sample liquid from dispensing opening 64.
Tubular dispenser 60 includes a flange 66 configured to engage lip 25 of access opening 26 of tubular container 20. In use, inlet opening 62 of tubular wall 61 is inserted into access opening 26 of tubular container 20 until flange 66 engages lip 25. The operator then rotates tubular dispenser 60 with respect to tubular container 20 to secure the two components together. In such operatively secured state, aperture 48 of sample collection annulus 44 is completely immersed within lysis buffer 27 below surface 29 thereof. In such state, a gap, e.g., of several mm, is provided between distal terminus 45 of sample collection annulus 44 and an inner surface of base 22 of tubular container 20 to facilitate complete mixing of the collected sample and lysis buffer 27. Dispensing opening 64 of tubular dispenser 60 may be provided with a cap (not shown) to hermetically seal a collected sample within sample processing device 10.
Sample processing device 10 may be used as follows. An operator who will perform a diagnostic test for HbAlc removes sample processing device 10 from packaging. The operator places tubular container 20 in the upright operating position in a stand (not shown) so that lysis buffer 27 pools in base 22 of tubular container 20. The operator removes hermetic seal 28 from tubular container 20 exposing access opening 26. The operator pricks a finger of a test subject with a lancet to produce a droplet of capillary blood. The operator then touches aperture 48 of sample collection annulus 44 to the capillary blood droplet. An amount of the droplet forms a film of capillary blood having a pair of opposed menisci within aperture 48. The volume of the film of collected capillary blood is determined by the volume of aperture 48 and the shape of the menisci of the film. The shape of the menisci may depend at least in part on the surface energy (e.g., hydrophobicity or hydrophilicity) of inner surfaces 43a′, 43b′, 43c′ of aperture 48 and the nature of the sample, e.g., whether the sample is polar such as an aqueous sample, non-polar such as a non-polar organic solvent, or includes one or more surfactants. For example, in the case of a capillary blood sample and sample collection annulus 44 when formed of a hydrophobic polymer such as untreated polyethylene, the menisci of the film of collected blood are observed to be convex and the volume of the collected blood is observed to be slightly greater than the volume of aperture 48, e.g., between about 10% and 20% greater, e.g., about 10 μl of collected blood as compared to the 8 μl volume of aperture 48. A ratio of the volume of lysis buffer 27 to the volume of blood collected by sample collection annulus 44 and delivered to tubular container 20 (100 μl buffer volume: 10 μl delivered) is about 10.
The operator then inserts sample collection annulus 44 with the collected capillary blood therein into tubular container 20 via access opening 26 thereof. The operator secures flange 66 of tubular dispenser 60 with respect to lip 25 of tubular container 20 with sample collection annulus 44 (and the collected capillary blood within aperture 48) disposed within tubular container 20 along with lysis buffer 27. Aperture 48 of sample collection annulus 44 is completely immersed within lysis buffer 27 below surface 29 thereof.
The operator then agitates sample processing device 10, e.g., by flicking an exterior surface of tubular container 20, to displace the capillary blood film from aperture 48 and mix the lysis buffer and collected capillary blood. During an incubation period, lysis buffer 27 lyses red blood cells present in the capillary blood. The operator then inverts the sample processing device 10 causing the lysis buffer blood mixture (including lysed blood cells) to enter tubular dispenser 60 via inlet opening 62. The operator squeezes major surfaces 63b, 63b′ to dispense an amount of the lysis buffer blood mixture from dispensing opening 64 and into the sample application port of a diagnostic device (not shown). An exemplary diagnostic device is any of the microfluidic devices disclosed in International Application No. PCT/US2021/013325 filed 13 Jan. 2021 (the “325 Application”), which is incorporated herein by reference in its entirety. The operator operates the diagnostic device to determine the amount of HbAlc present in the capillary blood of the test subject. After dispensing the lysis buffer blood mixture, dispensing opening 64 of the tubular dispenser may be sealed, e.g., with a cap (not shown) to preserve the remaining lysis buffer blood mixture and prevent leakage. Alternatively, sample processing device 10 may be disposed of if no further analysis is desired.
Sample processing device 10, tubular container 20, and sample manipulation unit 30, and disclosed methods of operation, are exemplary. Other configurations and/or methods of use may be implemented.
The dimensions of the sample collection aperture 48 may be different from the dimensions disclosed above. For example, in embodiments, the lengths of inner surfaces 43a′,43b′, and 43c′ are each independently at least about 2 mm long, at least about 2.5 mm long, at least about 3 mm, or at least about 4 mm long. In embodiments, the lengths of inner surfaces 43a′,43b′, and 43c′ are each independently about 6.5 mm or less, about 5.5 mm or less, or about 5 mm or less. In embodiments, at least one, e.g., one, of inner surfaces 43a′,43b′, and 43c′ has a shorter length that is between about 50% and 75%, e.g., about 66%, of the length of the longest length of inner surfaces 43a′,43b′, and 43c′. In embodiments, two of inner surfaces 43a′,43b′, and 43c′ have essentially the same longest length, e.g., about 4.8 mm and the third inner surface has the shorter length, e.g., about 4.2 mm.
In embodiments, the height d8 of the sample collection aperture is at least about 1 mm, at least about 1.5 mm, or at least about 2 mm. In embodiments, the height of the sample collection aperture is about 3 mm or less, about 2.5 mm or less, about 2.25 mm or less, or about 2 mm or less. For example, the height may be between about 1.75 and 2.25 mm. In embodiments, the area of the sample collection aperture is at least about 4 mm2, at least about 5 mm2, at least about 6 mm2, or at least about 7 mm2. In embodiments, the area of the sample collection aperture is about 12 mm2 or less, about 10 mm2 or less, about 9 mm2 or less, or about 8 mm2 or less. In embodiments, the volume of the sample collection aperture is at least about 8 mm3, at least about 9 mm3, at least about 10 mm3, or at least about 11 mm3. In embodiments, the volume of the sample collection aperture is about 20 mm3 or less, about 18 mm3 or less, about 16 mm3 or less, about 14 mm3 or less, or about 12 mm3 or less. In embodiments, the ratio of the area to the height of the sample collection aperture is between about 2.5 and 6, between about 3 and 5.5, or between about 3.5 and 4.5. In embodiments, the ratio of the area (in mm2) to the volume (in mm3) of the sample collection aperture is between about 0.3 and 0.8, between about 0.4 and 0.7, e.g., between about 0.5 and 0.6.
While sample collection annulus 44 is described as having a single triangular collection aperture 28, alternative sample collection annulus configurations may be implemented. For example, a sample collection annulus may have more than one collection aperture, e.g., 2, 3, 4 or more collection apertures. Whether in a single or multiple collection aperture configuration, each collection aperture may have a shape other than triangular. For example, a collection aperture may be a polygon having a number of sides greater than 3, e.g., 4, 5, 6 or more sides such that the collection aperture is respectively quadrangular, pentagonal, or hexagonal. A collection aperture may be arcuate in shape, e.g., oval, pyriform, circular, or elliptical. A collection aperture may have a shape that combines linear and arcuate internal surfaces, e.g., an oblong collection aperture. A collection aperture may have other shapes such as a vesica piscis or Reuleaux triangle. As another example, while aperture 48 is described as open within a perimeter defined by inner surfaces 63a′, 63b′, 63c′, a collection aperture may include a grid or mesh within a larger perimeter of the sample collection annulus. The grid or mesh may help support and retain a collected liquid sample within the aperture.
While sample manipulation unit 30 is described as including integrally secured sample collection unit 40 and tubular dispenser 60, other configurations may be implemented. For example, a sample collection unit and a tubular dispenser may be mechanically secured, e.g., via a mechanical connection such as a snap connection or press-fit that optionally permits the two components to be separated from one another. As another example, a sample manipulation unit may include a tubular dispenser and a sample collection annulus that are secured to one another without a sample collection arm or other extension. For example, a sample manipulation unit may include a tubular dispenser secured directly to a sample collection annulus, e.g., the tubular dispenser may be secured directly to a side of the sample collection annulus. A sample manipulation unit may include a sample collection unit secured to a tubular dispenser at a location other than a lip of an opening to the tubular dispenser. For example, a sample collection unit may be secured to a support that extends into or across an inlet opening to the tubular dispenser. Alternatively, the sample collection unit and tubular dispenser may be secured with respect to one another via press fitting.
A sample manipulation unit may include a sample collection unit and a tubular dispenser that are separate in that neither is secured with respect to the other during at least a portion of the time that the sample manipulation unit is in use. For example, sample collection unit may be configured so that an operator manipulates the sample collection annulus independently of a tubular dispenser to collect a liquid sample in one or more collection apertures of the sample collection annulus. For example, the operator may manipulate the sample collection annulus via an arm or extension from a side or outer perimeter thereof. The operator may then place the sample collection annulus (optionally including an arm or extension if present) with collected liquid sample into a tubular container. Such container may be sealed with a tubular dispenser, e.g., a cap that includes a dispensing opening to permit a mixture of a liquid reagent (if present) and liquid sample to be dispensed. Such a sample manipulation unit may alternatively include a tubular dispenser that lacks a capping function, such as a pipette. After placing the separate sample collection annulus in a tubular container, optionally including one or more reagents, an operator may use the pipette to remove an amount of a mixture of reagent (if present) and liquid sample.
While sample collection unit 40 is described as including sample collection arm 42 and sample collection annulus 44, other configurations may be implemented. For example, a sample collection annulus may be provided with an arm or other extension that is relatively rigid or inflexible. Such arm or extension may secure the sample collection annulus to a tubular dispenser or may be separate therefrom. As another example, a sample collection annulus may be provided without an arm or other extension (whether or not flexible). In such embodiment, an operator may manipulate the sample collection annulus via a perimeter thereof to collect a liquid sample, as by contacting the collection aperture(s) of the sample collection annulus to the liquid sample, and then placing the sample collection annulus into a tubular container, e.g., a tubular container containing one or more reagents to form a mixture of the reagent(s) and collected liquid sample.
While sample collection unit 40 of sample manipulation unit 30 is described as positioning aperture 48 of sample collection annulus 44 below surface 29 of lysis buffer, other configurations may be implemented. For example, a sample processing device may be configured to immerse the one or more annular collection apertures of a sample collection annulus only partially within a liquid reagent present in a tubular container. A sample processing device may be configured to position a distal terminus of sample collection annulus adjacent to and above a surface of a liquid reagent within a tubular container. As another example, a sample collection annulus may be configured to position the one or more (e.g., all) collection apertures thereof sufficiently far above the surface of a liquid reagent that the one or more collection apertures do not become immersed within the liquid reagent even with gentle agitation of the tubular container. Such sample processing device may be inverted to immerse the one or more collection apertures and the liquid reagent.
Tubular container 20 is described as containing a liquid reagent, e.g., lysis buffer 27. Other configurations are possible. For example, tubular container may contain no reagents at all. A tubular container may contain only one or more reagents in a dried state therein, e.g., an anticoagulant such as lithium heparin. Such a configuration may be used to, e.g., preserve a sample collected within a collection aperture(s) of a sample collection annulus for subsequent analysis. As another example, a tubular container may include one or more liquid reagents other than, or in addition to, a lysis buffer. Exemplary liquid reagents include water, organic solvent(s), or combination thereof. Other examples of liquid reagents include saline, blood coagulants or anticoagulants, and buffers lacking a lysing capability. Such tubular container, e.g., with no reagents, only dried reagents, or such liquid reagents, may be sealed with a cap to preserve the collected sample.
While tubular container 20 is described as having a volume of about 100 μl of liquid reagent, e.g., lysis buffer 27, other amounts or volumes may be implemented. For example, a tubular container may container a volume of liquid reagent(s) of at least about 5 μl, at least about 10 μl, at least about 25 μl, at least about 50 μl, or at least about 75 μl. A tubular container may contain a volume of liquid reagent(s) of about 300 μl or less, about 250 μl or less, about 200 μl or less, or about 175 μl or less.
While a ratio of the volume of liquid reagent in tubular container 20 to the volume of aperture 48 (vol. buffer: vol. aperture) is described to be about 12.5, other ratios may be implemented. For example, a ratio of the volume of liquid reagent(s) contained in a tubular container to the total volume of one or more apertures of a sample collection annulus may be about 5 or more, about 7.5 or more, or about 10 or more. The ratio of the volume of liquid reagent(s) contained in a tubular container to the total volume of one or more apertures of a sample collection annulus may be about 25 or less, about 20 or less, about 17.5 or less, or about 15 or less.
While a ratio of the volume of liquid reagent within tubular container 20 to the volume of blood collected by sample collection annulus 44 and delivered to tubular container 20 (100 μl buffer volume: 10 μl delivered) is described to be about 10, other ratios may be implemented. For example, a ratio of the volume of liquid reagent(s) contained in a tubular container to the total volume of liquid sample collected and delivered to the tubular container using a sample collection annulus may be about 5 or more, about 7.5 or more, or about 10 or more. The ratio of the volume of liquid reagent(s) contained in a tubular container to the total volume of liquid sample collected and delivered to the tubular container using a sample collection annulus may be about 25 or less, about 20 or less, about 17.5 or less, or about 15 or less.
Sample processing device 10 is described as configured for collecting and processing a capillary blood sample in preparation for a determination HbAlc. A sample processing device and/or sample collection annulus may be used to collect and optionally process other liquid samples including venous blood, urine, saliva, sputum, spinal fluid, and nasopharyngeal samples within one or more apertures of the sample collection annulus. A sample processing device and/or sample collection annulus may be used to collect non-biological samples such as water or other environmental samples. A sample processing device and/or sample collection annulus may be used to collect and process samples in connection with determinations other than HbAlc and/or determinations other than immunological. For example, a sample liquid collected using a sample collection annulus may be analyzed to determine the presence and/or amount of one or more pathogens, one or more inorganic targets such as lactate, or one or more physiochemical properties of a sample such as hematocrit of a blood sample. A sample liquid collected using sample collection annulus may be analyzed with any type of assay or diagnostic technique such as electrochemical, colorimetric or other assay or diagnostic technique indicative of the presence and/or amount of a target or physiochemical property of interest. A sample processing device and/or sample collection annulus may be used to collect and process samples in connection with uses other than performing determinations of targets or properties of samples. For example, a sample processing device may be used to collect samples and dispense the sample or combinations of the sample and reagents for purposes such as drying or preservation.
Sample processing device 10 is described as processing a blood sample by lysing red blood cells therein to release a target, e.g., HbAlc, therein for a diagnostic determination. A sample processing device may perform other steps in the alternative to or in combination with such lysing. For example, processing may include or essentially consist of collecting a liquid sample using a sample collection annulus thereby obtaining a liquid sample suitable for drying or direct introduction to a diagnostic device for determination of the presence and/or amount of a target(s) within the sample or a property of the sample (e.g., hematocrit). Processing may include or consist essentially mixing the collected sample with a liquid reagent that dilutes and optionally preserves components (e.g., targets) within the sample without lysis of cells therein. Processing may include or consist essentially of mixing the collected sample with a reagent including a binding agent to a target(s) therein, e.g., an antibody or other reagent that specifically binds a target(s) with the sample. Processing may include or consist essentially of subjecting the collected sample, whether or not combined with one or more reagents, to centrifugation.
While an operator is described as dispensing a reagent sample mixture from sample processing device 10 by squeezing wall 61 of tubular dispenser 60, other methods may be implemented. For example, a tubular container may be formed of a flexible material permitting a user to dispense a mixture therefrom by squeezing the tubular container as an alternative or in combination with squeezing a wall of a tubular dispenser.
Sample processing unit 100 comprises a sample collection tube 108 configured to receive the sample collection annulus 104 and a sample collected therein. As described herein, the sample collection tube 104 may include a liquid reagent such as a buffer, e.g., a lysis buffer, therein, for mixing with the sample. The sample collection tube 108 may include a chamber 130 therein for receiving the buffer and the sample through an opening 134. The sample collection tube 108 may include a protrusion configured 128 to mate with a portion of the dispenser 106. The dispenser 106 may include an outer cover having an internal groove 118 configured to mate with a wall 132 defining a body on the sample collection tube 108, thereby securing the dispenser 106 to the sample collection tube 108. The dispenser 106 may include a channel 124 therein to dispense the mixture of the sample and the lysis buffer (e.g. dispense onto an assay device).
Side walls 143a, 143b, 143c have a constant thickness d7′ in a plane perpendicular to axis a1′ between upper surface 109 and a mid-point 113 of the side walls. Proceeding from mid-point 113 to lower surface 111, the thickness of side walls 143a, 143b, 143c tapers from thickness d7′ to a reduced thickness d7″ at lower surface 111. Thickness d7′ is between about 0.3 mm and 0.8 mm, e.g., about 0.5 mm. Alternatively, inner and outer surfaces 143,145 may intersect at lower surface 111. Thickness d7″ is between about 0.05 mm and 0.4 mm, e.g., about 0.25 mm. A ratio of the thickness d7′ between mid-point 113 and upper surface 109 to thickness d7″ at lower surface 111 is typically between about 1.5 and about 10, e.g., about 2. The interior surface 143 of each side wall 143a, 143b, 143c is generally planar and parallel with axis a1′. The outer surface 143 of each side wall 143a, 143b, 143c is parallel to the inner surface of each sidewall between upper surface 109 and mid-point 113. The outer surface 145 of each side wall 143a, 143b, 143c tapers inward between mid-point 113 and lower surface 111 by an amount corresponding to the reduced thickness between mid-point 113 and lower surface 111.
In some embodiments, the thickness of side walls 143a, 143b, 143c is constant proceeding from lower surface 111 to mid-point 113, e.g., with a thickness corresponding to thickness d7′ and then tapers proceeding toward upper surface 109, e.g., with a thickness corresponding to thickness d7″. In other embodiments, the thickness of side walls 143a, 143b, 143c tapers proceeding from mid-point 113 proceeding toward both upper and lower surfaces 109,111, e.g., from a thickness d7′ to a thickness d7″. The tapered configuration of the thickness of side walls 143a, 143b, 143c can help improve sample collection when annulus 104 is inserted through the surface of a sample liquid to collect a volume of the sample liquid within the annulus. For example, the tapered configuration may help pierce the surface of the liquid so that the liquid collects within the annulus. In the absence of the tapered configuration, the surface tension of the liquid may inhibit the annulus from readily passing through the liquid surface.
The sample collection annulus 104 may be include any dimension, feature, and/or shape as described herein. For example, the sample collection annulus may have an outer length analogous to length d3 of annulus 44 of about 5 to 7 mm, e.g., about 5.8 mm, and an outer width analogous to width d4 of annulus 44 of about 3.5 mm to 6 mm, e.g., about 4.2 mm. Inner surfaces of sides 143a, 143b may have a length analogous to length d5 of annulus 44 of about 4 mm to 6 mm, e.g., about 4.8 mm. The inner surface of side 143c may have a length analogous to length d4 of annulus 44 of about 3.5 mm to 5.5 mm, e.g., about 4.2 mm. Alternatively, the lengths of the inner surface of sides 143c may be the same as for the inner surfaces of sides 143a, 143b. Sample collection aperture 105 has an area between the inner surfaces of side walls 143a, 143b, 143c of about 6 mm2 to about 9 mm2, e.g., about 7.6 mm2. Sample collection aperture 105 has a volume between the inner surfaces of side walls 143a, 143b, 143c and upper and lower surfaces 109,111 of from about 11 μl (11 mm3) to about 16 μl (16 mm3), e.g., about 13.3 μl (13.3 mm3). A ratio of the area (in mm2) to the height d8 (in mm) of aperture 105 (area: height) is from about 2.5 to about 8, e.g., from about 3 to about 7, e.g., about 4.3. A ratio of the area (in mm2) to the volume (in mm3) of aperture 105 (area: volume) is from about 0.3 to about 0.8, e.g., about 0.6. A ratio of the volume of lysis buffer 27 to the volume of aperture 105 (vol. buffer: vol. aperture) is from about 5 to about 20.
The sample collection arm (102) may be attached to the sample collection annulus (104) at an attachment point 107. As described herein, in some cases, the sample collection arm 102 and the sample collection annulus 104 are co-linear, such that the sample collection arm and the sample collection annulus extend along the same or substantially the same longitudinal axis. In some cases, the sample collection annulus 104 extends along a longitudinal axis (e.g., annulus axis parallel to the plane of collection aperture 105) that is not co-linear with a longitudinal axis of the sample collection arm 102 (e.g., arm axis). For example, in some cases the annulus axis extends away from the arm axis at an angle from about 0.1 degree to about 90 degree, from about 1 degree to about 75 degree, from about 10 degree to about 50 degree, from about 20 degree to about 40 degree, from about 25 degree to about 35 degree, or about 30 degree. In some embodiments, the transition of the sample collection arm extending along the arm axis to the sample collection annulus extending along the annulus axis occurs at or about the attachment point 107.
With reference to
After obtaining the sample, the sample is mixed with the lysis buffer disposed within the sample collection tube 108 (B). For example, the sample collection arm 102 may be rotated to swirl the sample collection annulus 104 within the sample collection tube 108. After mixing the sample with the lysis buffer, the top portion 110 of the sample collection arm may be broken off, thereby leaving the bottom portion 112 and the sample collection annulus within the sample collection tube 108 (C). The dispenser 106 is then coupled to the sample collection tube 108, wherein the sample collection tube 108 may be inverted so as to dispense the mixture of the sample and the lysis buffer onto an assay device (e.g., a microfluidic strip) (D).
Sample collection annulus 104 may incorporate any feature, dimension, and/or shape and be used for any sample and/or liquid reagents as disclosed herein for any other sample collection annulus, e.g., annulus 44. Samples collected using annulus 104 may be subjected to any processing, assay and/or diagnostic technique as disclosed herein for any other sample collection annulus, e.g., annulus 44. The sample collection tube 108 and the dispenser 106 may incorporate any feature, dimension, and/or shape from any other sample collection tube and dispenser described herein.
All publications, patents, patent applications and other documents cited in this application are hereby incorporated by reference herein in their entireties for all purposes to the same extent as if each individual publication, patent, patent application or other document were individually indicated to be incorporated by reference for all purposes. While various specific embodiments have been illustrated and described, the above specification is not restrictive. It will be appreciated that various changes can be made without departing from the spirit and scope of the present disclosure(s). Many variations will become apparent to those skilled in the art upon review of this specification.
This application claims the benefit of and priority to U.S. Provisional Application No. 63/305,866, filed Feb. 2, 2022, and to U.S. Provisional Application No. 63/403,197, filed Sep. 1, 2022, the entire contents of each which are incorporated by reference herein.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/GB2023/050226 | 2/2/2023 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 63403197 | Sep 2022 | US | |
| 63305866 | Feb 2022 | US |
