Patent Grant
12053771
The technology relates in part to pipette tips and methods for using them.
Pipette tips are utilized in a variety of industries that have a requirement for handling fluids, and are used in facilities including medical laboratories and research laboratories, for example. In many instances pipette tips are used in large numbers, and often are utilized for processing many samples and/or adding many reagents to samples, for example.
Pipette tips often are substantially cone-shaped with an aperture at one end that can engage a fluid dispensing device, and another relatively smaller aperture at the other end that can receive and emit fluid. Pipette tips generally are manufactured from a moldable plastic, such as polypropylene, for example. Pipette tips are made in a number of sizes to allow for accurate and reproducible liquid handling for volumes ranging from nanoliters to milliliters.
Pipette tips can be utilized in conjunction with a variety of fluid dispensing devices, including manual dispensers (e.g., pipettors) and automated dispensers to manipulate liquid samples. A fluid dispenser is a device that, when attached to the upper end of a pipette tip (the larger opening end), applies negative pressure to acquire fluids, and applies positive pressure to dispense fluids. Typically a pipette tip is mounted onto the lower or distal portion of a fluid dispenser (typically referred to as the barrel, nozzle or mounting shaft) by either inserting the distal portion of a fluid dispenser into the interior of a pipette tip or positioning the distal portion of a fluid dispenser around the pipette tip exterior. A distal portion of a dispenser is inserted into the interior of the upper end of a pipette tip with an amount of force sufficient to cause a pipette tip wall to expand, creating a seal between an outer surface of the distal portion of the dispenser and an inner surface of a pipette tip. Alternatively, a distal portion of a dispenser is inserted around the upper end of a pipette tip with an amount of force sufficient to cause a pipette tip wall to compress, creating a seal between an inner surface of the distal portion of the dispenser and an outer surface of a pipette tip.
Provided in certain aspects are pipette tips having proximal regions with features that facilitate wall expansion (expansion sealing tips) or wall compression (compression sealing tips) when a pipette tip is mounted onto and sealingly engages with the appropriately designed liquid dispensing device member. Incorporating such features in a pipette tip proximal region can reduce the amount of axial force required to engage and/or disengage a pipette tip from a fluid dispenser.
Provided in certain aspects is a pipette tip that includes an exterior surface, an interior surface, a proximal region, a distal region and a junction between a proximal region and a distal region. In certain aspects, an interior surface of a pipette tip defines a substantially frustum-shaped void and is substantially smooth and uniform (expansion sealing tip).
In certain aspects, a pipette tip includes an annular flange at a proximal terminus of a proximal region. A pipette tip often includes a distal shoulder at a junction between a proximal region and a distal region.
A proximal region often includes a plurality of longitudinally-oriented grooves on an exterior surface of a pipette tip. A groove typically has a groove width and a groove floor. A proximal region also often includes a plurality of longitudinally-oriented panels on an exterior surface of a pipette tip, where each of the panels is adjacent to one of the grooves. A panel typically includes a panel sidewall, a panel face and a panel width. A pipette tip typically includes a sealing zone on an interior surface of a pipette tip. Grooves and panels or portions thereof usually extend over a sealing zone. In certain aspects, grooves on an exterior surface of a pipette tip extend from a flange to a shoulder. In certain aspects, panels on an exterior surface of a pipette tip extend from a flange to a shoulder. In certain aspects, one or more panels include a protrusion on a panel face. A protrusion typically has a protrusion face and a transition surface between a panel face and a protrusion face.
In certain aspects, a panel width is greater than a groove width. In certain aspects, a distance between a groove floor and an interior surface of a pipette tip opposite the groove floor, for each groove, is less than a distance between a panel face and an interior surface of the pipette tip opposite the panel face, for each panel.
In some aspects, a distal region of a pipette tip has a continuous taper of a pipette tip wall surface to form an edge or boundary of minimal thickness. In certain aspects, a distal region of a pipette tip has a wall thickness that tapers from (a) a point at or between (i) about a junction of a proximal region and distal region to (ii) about one-quarter of the axial distance from a terminus of the distal region to the junction, to (b) a distal region terminus, and a wall thickness at the distal region terminus is about 0.0030 inches to about 0.0055 inches.
In certain aspects, an interior surface of a pipette tip has an annular groove.
Provided in certain aspects is a pipette tip that includes an exterior surface, an interior surface, a proximal region, a distal region and a junction between a proximal region and a distal region. In certain aspects, an exterior surface of a pipette tip proximal region is substantially cylindrical and is substantially smooth and uniform (compression sealing tip).
A pipette tip often includes a distal shoulder at a junction between a proximal region and a distal region.
A proximal region often includes a plurality of longitudinally-oriented grooves on an interior surface of a pipette tip. A groove typically has a groove width and a groove floor. A proximal region also often includes a plurality of longitudinally-oriented panels on an interior surface of a pipette tip, where each of the panels is adjacent to one of the groove. A panel typically includes a panel sidewall, a panel face and a panel width. A pipette tip typically includes a sealing zone on an exterior surface of a pipette tip. Grooves and panels or portions thereof usually extend over a sealing zone. In certain aspects, grooves on an interior surface of a pipette tip extend from a proximal end of a proximal region to a shoulder. In certain aspects, panels on an interior surface of a pipette tip extend from a proximal end of a proximal region to a shoulder. In certain aspects, one or more panels include a protrusion on a panel face. A protrusion typically has a protrusion face and a transition surface between a panel face and a protrusion face.
A panel width is typically greater than a groove width. In certain aspects, a distance between a groove floor and an exterior surface of a pipette tip opposite the groove floor, for each groove, is less than a distance between a panel face and an exterior surface of a pipette tip opposite a panel face.
In certain aspects, an interior surface of a pipette tip has an annular groove.
In some aspects, a distal region of a pipette tip has a continuous taper of a pipette tip wall surface to form an edge or boundary of minimal thickness. In certain aspects, a distal region of a pipette tip has a wall thickness that tapers from (a) a point at or between (i) about a junction of a proximal region and distal region to (ii) about one-quarter of the axial distance from a terminus of the distal region to the junction, to (b) a distal region terminus, and a wall thickness at the distal region terminus is about 0.0030 inches to about 0.0055 inches.
Also provided in certain aspects are methods for manufacturing pipette tips described herein, and molds used in manufacturing processes. Provided also in certain aspects are methods for using pipette tips described herein.
Certain embodiments are described further in the following description, examples, claim(s) and drawings.
The drawings illustrate certain embodiments of the technology and are not limiting. For clarity and ease of illustration, the drawings are not necessarily made to scale and, in some instances, various aspects may be shown exaggerated or enlarged to facilitate an understanding of particular embodiments.
Certain features in the drawings are summarized in Table 1.
Provided in part herein are pipette tip embodiments that permit ergonomic engagement and disengagement of a pipette tip and a fluid dispensing device (i.e., reduce the amount of axial force required to engage and/or disengage a pipette tip from a fluid dispensing device).
Certain structural features of pipette tip embodiments described herein may afford particular advantages to some users. In some embodiments, one or more of the structural features described may be incorporated into a pipette tip embodiment in one or more combinations. Incorporation of a structural feature can result in an advantage described hereafter, in certain instances.
Many features of the pipette tip embodiments described herein are shared between the different pipette tip embodiments (see Table 1). Therefore, the features will be described in detail for one pipette tip embodiment and related to the similar features of other pipette tip embodiments.
Ergonomic Pipette Tip Groove and Panel Configurations
Expansion Sealing Tips
Provided in certain embodiments are pipette tips that includes an exterior surface, an interior surface, a proximal region, a distal region and a junction between the proximal region and the distal region. A proximal region often includes a plurality of longitudinally-oriented grooves on an exterior surface of a pipette tip (e.g., 140 as shown in
In some embodiments, a pipette tip comprises a set of axially extended grooves and panels circumferentially spaced around the external surface of the proximal region of the pipette tip. The term “circumferentially spaced,” “circumferentially configured”, “circumferentially disposed” and the like as used herein, refer to axially oriented grooves and panels disposed around a circumference of the proximal region of a pipette tip (e.g., circumference latitudinal axis 113 shown in
In some embodiments, two or more panels are regularly distributed around the exterior surface of a pipette tip, and in certain embodiments, all panels are regularly distributed around the exterior surface of a pipette tip (e.g., all grooves have the same groove width). In some embodiments, two or more panels are asymmetrically distributed around the exterior surface of a pipette tip. In some embodiments, two or more grooves are regularly distributed around the exterior surface of a pipette tip, and in certain embodiments, all grooves are regularly distributed around the exterior surface of a pipette tip (e.g., all panels have the same panel width). In some embodiments, two or more grooves are asymmetrically distributed around the exterior surface of a pipette tip.
The interior surface of a pipette tip typically defines a substantially frustum-shaped void and is substantially smooth and uniform (i.e., not interrupted by a protrusion or cavity; follows the contours of a nozzle or shaft with which it seals).
A pipette tip typically includes a sealing zone. In certain embodiments, the proximal region comprises a sealing zone (e.g., 136 as shown in
Certain pipette tip embodiments can include a flared lead-in surface at the end of a proximal region. In certain aspects, a pipette tip includes a flange (e.g., annular flange) at a proximal terminus of a proximal region. In such embodiments, a flange may be flared, and a lead-in diameter of a flange can allow for dispenser engagement tolerance, which is relevant for multi-dispenser applications, for example. Such a flange can provide a larger contact zone for engaging a pipette nozzle or mounting shaft, and can increase the probability of a sealing engagement between a dispenser nozzle or mounting shaft not coaxially aligned with a pipette tip by guiding the axial center of a pipette tip to the axial center of a dispenser nozzle or mounting shaft. An annular flange also can provide pipette tip rigidity in addition to facilitating dispenser alignment. In some embodiments, pipette tips described herein include an annular flange at a proximal terminus of the proximal region. An example of an annular flange 110 is illustrated in
A pipette tip often includes a distal shoulder at the junction between the proximal region and the distal region (e.g., 115 as shown in
Grooves and panels often extend from an annular flange (e.g., 110 as shown in
An exterior surface of a pipette tip can include any suitable number of panels and grooves. A pipette tip sometimes includes 3 or more grooves (e.g., 3 to about 50 grooves; 3 to about 40 grooves; 4 to about 40 grooves; about 5 to about 40 grooves; about 6 to about 40 grooves; about 7 to about 40 grooves; about 8 to about 40 grooves; about 9 to about 40 grooves; about 10 to about 40 grooves; about 10 to about 30 grooves; about 8 to about 20 grooves, about 4 to about 14 grooves; about 6 to about 10 grooves; about 8 to about 10 grooves; about 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40 grooves) and sometimes includes 3 or more panels (e.g., 3 to about 50 panels; 3 to about 40 panels; 4 to about 40 panels; about 5 to about 40 panels; about 6 to about 40 panels; about 7 to about 40 panels; about 8 to about 40 panels; about 9 to about 40 panels; about 10 to about 40 panels; about 10 to about 30 panels; about 8 to about 20 panels; about 4 to about 14 panels; about 6 to about 10 panels; about 8 to about 10 panels; about 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40 panels). For example,
A groove often includes a groove floor (e.g., 150 as shown in
In certain embodiments, a distance Z between a groove floor and an interior surface of a pipette tip opposite the groove floor, for each groove, is less than a distance W between a panel face and an interior surface of a pipette tip opposite the panel face (e.g., W1 as shown in
A “minimal thickness” for a pipette tip wall at a groove floor may predominately be a reflection of the limits of current and future manufacturing and molding capabilities. Factors such as plastic viscosity and flow characteristics, as well as plastic hardeners (e.g., currently available plasticizers or hardeners, or plasticizers yet to be formulated) also may contribute to the minimal thickness attainable for pipette tips described herein. Therefore, thicknesses described herein for pipette tip walls between a groove floor and an interior surface of a pipette tip opposite the groove wall sometimes are at the current limit of molding and manufacturing technology, and it is possible that future molding, manufacturing and plastics technology will result in lesser thicknesses.
Two or more or all grooves in a pipette tip often have the same distance (wall thickness) between a groove floor and an interior surface of a pipette tip opposite the groove floor.
Two or more grooves in a pipette tip sometimes have a different distance (wall thickness) between a groove floor and an interior surface of a pipette tip opposite the groove floor. In some embodiments, the distance from an interior surface of a pipette tip opposite a groove floor (e.g., Z1 shown in
A panel often includes a panel face (e.g., 160 as shown in
In certain embodiments, the distance between a panel face and an interior surface of a pipette tip opposite a panel face (e.g., W 1 shown in
In some embodiments, W (pipette tip wall thickness at a panel) can be about 2 to about 50 times greater than Z (pipette tip wall thickness under a groove), about 2 to about 40 times greater, about 2 to about 30 times greater, about 2 to about 20 times greater, about 2 to about 10 times greater (e.g., about 2 times greater; about 3 times greater; about 4 times greater; about 5 times greater; about 6 times greater; about 7 times greater; about 8 times greater; about 9 times greater; about 10 times greater, about 11 times greater, about 12 times greater, about 13 times greater, about 14 times greater, about 15 times greater, about 16 times greater, about 17 times greater, about 18 times greater, about 19 times greater, about 20 times greater, about 25 times greater, about 30 times greater, about 35 times greater, about 40 times greater, about 45 times greater or about 50 times greater).
A width of a panel (Y) or a groove (X) typically is measured perpendicular to the longitudinal axis (i.e., axis 112 shown in
A groove width X is a linear or circumferential distance typically measured at a proximal region exterior surface between two panels flanking a groove (e.g., width X1 shown in
In certain embodiments, one or more of the grooves of a pipette tip have different widths (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10 or more different widths for grooves). One or more grooves of a pipette tip sometimes have a groove width (linear distance) of about 0.003 inches to about 0.040 inches, about 0.003 inches to about 0.030 inches about 0.003 inches to about 0.025 inches, about 0.005 inches to about 0.02 inches, about 0.01 inches to about 0.015 inches (e.g., about 0.003 inches, about 0.004 inches, about 0.005 inches, about 0.006 inches, about 0.007 inches, about 0.008 inches, about 0.009 inches, about 0.010 inches, about 0.011 inches, about 0.012 inches, about 0.013 inches, about 0.014 inches, about 0.015 inches, about 0.016, inches, about 0.017 inches, about 0.018 inches, about 0.019 inches, about 0.020 inches, about 0.021 inches, about 0.022 inches, about 0.023 inches, about 0.024 inches, about 0.025 inches, about 0.026 inches, about 0.027 inches, about 0.028 inches, about 0.029 inches, about 0.030 inches, about 0.031 inches, about 0.032 inches, about 0.033 inches, about 0.034 inches, about 0.035 inches, about 0.036 inches, about 0.037 inches, about 0.038 inches, about 0.039 inches or about 0.040). In some embodiments, one or more grooves of a pipette tip have a groove width (circumferential distance) of about 5 degrees to about 30 degrees (e.g., about 1 degree, about 2 degrees, about 3 degrees, about 4 degrees, about 5 degrees, about 6 degrees, about 7 degrees, about 8 degrees, about 9 degrees, about 10 degrees, about 11 degrees, about 12 degrees, about 13 degrees, about 14 degrees, about 15 degrees, about 16 degrees, about 17 degrees, about 18 degrees, about 19 degrees, about 20 degrees, about 21 degrees, about 22 degrees, about 23 degrees, about 24 degrees, about 25 degrees, about 26 degrees, about 27 degrees, about 28 degrees, about 29 degrees or about 30 degrees).
A panel width Y is a linear or circumferential distance typically measured at a proximal region exterior surface from one end of a panel face to the other end of the panel face Y (e.g., width Y1 shown in
In some embodiments, a panel width Y of a pipette tip is greater than a groove width X of a pipette tip. In certain embodiments, a panel width for each panel of a pipette tip is greater than a groove width for each groove of a pipette tip. In some embodiments, a panel width is more than about 2 times greater than a groove width, more than about 5 times greater than a groove width, more than about 10 times greater than a groove width; more than about 20 times greater than a groove width; more than about 25 times greater than a groove width. In some embodiments, a panel width is about 1.1 to about 50 times greater than a groove width (e.g., about 1.1 times greater, about 1.1 times greater, about 1.2 times greater, about 1.3 times greater, about 1.4 times greater, about 1.5 times greater, about 1.6 times greater, about 1.7 times greater, about 1.8 times greater, about 1.9 times greater, about 2 times greater; about 3 times greater; about 4 times greater; about 5 times greater; about 6 times greater; about 7 times greater; about 8 times greater; about 9 times greater; about 10 times greater; about 11 times greater; about 12 times greater; about 13 times greater; about 14 times greater; about 15 times greater; about 16 times greater; about 17 times greater; about 18 times greater; about 19 times greater; about 20 times greater; about 21 times greater; about 22 times greater; about 23 times greater; about 24 times greater; about 25 times greater; about 26 times greater; about 27 times greater; about 28 times greater; about 29 times greater; about 30 times greater; about 31 times greater; about 32 times greater; about 33 times greater; about 34 times greater; about 35 times greater; about 36 times greater; about 37 times greater; about 38 times greater; about 39 times greater; about 40 times greater; about 41 times greater; about 42 times greater; about 43 times greater; about 44 times greater; about 45 times greater; about 46 times greater; about 47 times greater; about 48 times greater; about 49 times greater or about 50 times greater).
The sum of all groove widths and panel widths of a pipette tip equal the circumference of a pipette tip measured around the exterior surface of the pipette tip. The circumference of a pipette tip in the proximal region generally will increase as the fluid capacity of the tip increases (e.g., 10 ul, 200 ul, 300 ul, 1000 ul, 1250 ul). In some embodiments this relationship is described by the following equation:
C=nX+nY
C is a circumference value measured at the panel faces
X is the groove width
Y is the panel width
n is the number of panels or grooves
(Assumption is that groove widths are equal and panel widths are equal).
Utilizing the above-described relationship, for pipette tips of any circumference, values for X, Y and n can be determined that in conjunction with suitable values as described for W and Z provide for enhanced wall expandability while maintaining wall stability.
Without being limited by theory, as groove widths are smaller than panel widths, grooves represent a smaller percentage of a pipette tip external surface than panels. Panels principally provide the structural integrity of a pipette tip wall, allowing the thickness of a pipette tip wall at the groove floor (distance between a groove floor and an interior surface of a pipette tip opposite the groove floor) to be minimized. Axial forces generated when a fluid dispensing device member (e.g., barrel, nozzle or mounting shaft) is inserted into the interior of a pipette tip are focused to the thin wall regions under grooves, as these represent the weakest portions of a pipette tip wall. Accordingly less force is required to stretch (expand) a pipette tip wall to accommodate and seal a mounting shaft or nozzle as these regions not only are structurally favorable to expansion and hoop stretching (thin walls), but also represent a small portion of the overall pipette tip wall surface. An insertion force required to cause hoop stretching (expansion) for a pipette tip having grooves and panels with the described dimensions is substantially less than the insertion force required to cause hoop stretching (expansion) for a pipette tip not having these features. Also without being limited by theory, a disengagement force (ejection force) required to disassociate a pipette tip having the described features is substantially less than the disengagement force required to disassociate a pipette tip not having the described features. Reduced insertion and disengagement forces can reduce strain on a user associated with attaching and ejecting pipette tips, and can reduce the occurrence and severity of repetitive motion conditions, for example.
A latitudinal profile is a profile across a latitudinal axis or cutting plane of a pipette tip, which latitudinal distance or cutting plane is perpendicular to a longitudinal axis (e.g., axis 112 as shown in
One or more or all panel faces in some embodiments include a protrusion (e.g., 462 as shown in
A protrusion often includes a protrusion face (e.g., 470 as shown in
In some embodiments, the proximal regions of a pipette tip having grooves and panels as described herein is capable of hoop stretching at a sealing zone upon insertion of a fluid dispensing device member into the interior of the pipette tip. In some embodiments, the hoop stretching (expansion) is about 0.001 inches to about 0.005 inches; about 0.002 inches to about 0.004 inches; e.g., about 0.001 inches; about 0.002 inches; about 0.003 inches; about 0.004 inches; about 0.005 inches.
In some embodiments, the interior surface of the pipette tip in the proximal region is in contact with the exterior surface of a fluid dispensing device member and forms a seal between the fluid dispensing device member and the interior surface of the pipette tip in pipette tip at the sealing zone, and the proximal region of the pipette tip is in an expanded state relative to a relaxed state adopted by the proximal region of the pipette tip when the interior surface of the pipette tip is not in contact with the fluid dispensing device member and forming a seal with the fluid dispensing device member.
Non-limiting examples of expansion pipette tips having panels and grooves are illustrated in
The proximal region exterior surface includes a plurality of longitudinally-disposed grooves 140 and panels 170 as shown in
Non-limiting examples of alternative geometries of grooves and panels with a protrusion are illustrated for pipette tip embodiment 500 shown in
Compression Sealing Tips
In some embodiments, features generally as described for expansion sealing pipette tips (including, but not limited to, grooves, groove widths, groove profiles, pipette tip wall thickness under a groove, panels, panel faces, panel sidewalls, panel profiles, thickness of a pipette tip wall at a panel and protrusions) are present in compression sealing tips. A principle difference expansion and compression sealing tips is the position of the grooves and panels relative to the interior and exterior surfaces of a pipette tip. For an expansion sealing tip an interior surface of a proximal region of a pipette tip is substantially smooth and uniform; for a compression sealing tip an exterior surface of a proximal region of a pipette tip is substantially smooth and uniform. Grooves and panels are located on an exterior surface of a proximal region of a pipette tip for an expansion sealing tip. Grooves and panels are located on an interior surface of a proximal region of a pipette tip for a compression sealing tip. A sealing zone is an interior surface of the proximal region of an expansion sealing tip. In distinction, a sealing zone (e.g., 736 as shown in
Grooves and panels that facilitate wall expansion for expansion sealing pipette tips, when present in compression sealing pipette tips facilitate compression of a pipette tip wall when the compression sealing pipette tip is attached to a suitable fluid dispensing device member. Without being limited by theory, axial forces generated when a fluid dispensing device member (e.g., barrel, nozzle or mounting shaft) is inserted around the exterior surface of a compression sealing pipette tip are focused to the thin wall regions under grooves, as these represent the weakest portions of a pipette tip wall. Accordingly less force is required to compress a pipette tip wall to accommodate and seal a mounting shaft or nozzle as these regions (thin walls) are not only structurally favorable to compression, but also represent a small portion of the overall pipette tip wall surface. An insertion force required to cause compression of a pipette tip wall of a pipette tip having grooves and panels with the described characteristics and dimensions is substantially less than the insertion force required to cause compression of the wall of a pipette tip not having these features. Also without being limited by theory, a disengagement force required to disassociate a pipette tip having the described features is substantially less than the disengagement force required to disassociate a pipette tip not having the described features. Reduced insertion and disengagement forces can reduce strain on a user associated with attaching and ejecting pipette tips, and can reduce the occurrence and severity of repetitive motion conditions, for example.
Non-limiting examples of compression sealing pipette tips with panels and grooves are illustrated in
The proximal region interior surface includes a plurality of longitudinally-disposed grooves 740 and panels 765 (shown in
Additional Pipette Tip Embodiments
Pipette tip embodiments described above can include one or more of the following features.
Blade Feature
Some pipette tip embodiments can include a distal region having a tapered wall thickness and terminating with a “knife edge” thickness. The term “knife edge” or “blade,” as used herein refers to an edge resulting from a continuous taper of a pipette wall surface. The taper can be established by the inner surface disposed at a different angle than the outer surface along all or a portion of the axial length of the distal region. In certain embodiments, the surfaces form a sharply defined single contiguous edge or boundary of minimal thickness. Without being limited by theory, a knife edge or blade feature (e.g., distal region terminus wall thickness 1030 shown in
In some embodiments, the lower (or distal) about one-quarter of the distance from the distal region terminus (e.g., 125 shown in
In some embodiments, a pipette tip having a wall thickness at the distal region terminus as described above is configured to retain less than 0.065% of the fluid drawn into the pipette tip, after the fluid is dispensed (e.g., less than about 0.065%, 0.060%, 0.055%, 0.050%, 0.045%, 0.040%, 0.035%, 0.030%, 0.025%, 0.020%, 0.015%, 0.010%, 0.0095%, 0.0090%, 0.0085%, 0.0080%, 0.0075%, 0.0070%, 0.0065%, 0.0060%, 0.0055%, 0.0050%, 0.0045%, 0.0040%, 0.0035%, 0.0030%, 0.0025%, 0.0020%, 0.0015%, 0.0010%, 0.00095%, 0.00090%, 0.00085%, 0.00080%, 0.00075%, 0.00070%, 0.00065%, 0.00060%, 0.00055%, 0.00050%, 0.00045%, 0.00040%, 0.00035%, 0.00030%, 0.00025%, 0.00020%, 0.00015%, 0.00014%, 0.00013%, 0.00012%, 0.00011%, or about 0.00010%). In certain embodiments, the pipette tip retains between about 0.00010% and about 0.00015% (e.g., about 0.00011%, 0.00012%, 0.00013%, or 0.00014%) of the fluid drawn into the tip, after the fluid is dispensed. In some embodiments, the pipette tip is configured to retain no more than 0.00012% of the fluid drawn into the tip, after the fluid is dispensed.
Annular Groove
In certain embodiments, the interior region of the proximal region of a pipette tip comprises an optional annular groove. As described above, annular groove is an area of increased surface area formed during the molding process that corresponds to a portion of the mold core pin. The core pin often forms the internal surfaces of the object to be molded, for example the pipette tips described herein. The distance between the core pin and the mold cavity (e.g., the part of the mold that forms the outer surface of the object) determines the thickness of the object to be molded (e.g., pipette tip). The shape of the core pin can offer an increased surface area upon which the cooling pipette tip (e.g., specifically annular groove may find purchase and therefore remain in contact with the core pin during cooling and separation from the portion of the mold that forms the pipette tip outer surface, which in turn may facilitate release and ejection of the pipette tip from the mold core after cooling of the pipette tip. Annular groove resides on the interior surface of proximal region (e.g., 180 shown in
Methods of Use
Pipette tips frequently are used in conjunction with a pipetting device (manual or automated) to take up, transport or deliver precise volumes of liquids or reagents.
Provided herein is a method for engaging an expansion sealing pipette tip with a fluid dispensing device member comprising inserting a fluid dispensing device member into a pipette tip of any one of the described embodiments with a force sufficient to form a seal between the fluid dispensing device member and the pipette tip at a sealing zone. In certain embodiments, a proximal region of the pipette tip hoop stretches at a sealing zone. In certain embodiments the amount of hoop stretching is about 0.001 inches to about 0.005 inches.
Provided herein is a method for engaging a compression sealing pipette tip with a fluid dispensing device member comprising contacting a fluid dispensing device member with an exterior surface of a pipette tip of any one of the described embodiments with a force sufficient to form a seal between the fluid dispensing device member and the pipette tip at a sealing zone. In certain embodiments, a proximal region of a pipette tip is compressed at a sealing zone. In certain embodiments the amount of compression is about 0.001 inches to about 0.005 inches.
Provided herein is a method of using a pipette tip comprising (a) contacting a pipettor with a pipette tip and forming a seal between the pipettor and the pipette tip, and (b) contacting the pipette tip with a fluid, where the pipette tip comprises a proximal region and a distal region, and further where the proximal region comprises axially oriented grooves and panels.
Pipette tip embodiments described herein can be of any overall geometry useful for dispensing fluids in combination with a fluid dispensing device. The pipette tips described herein also can be of any volume useful for dispensing fluids in combination with a fluid dispensing device. Non-limiting examples of volumes useful for dispensing fluids in combination with a fluid dispensing device, and described as non-limiting embodiments herein, include pipette tips configured in sizes that hold from 0 to 10 microliters, 0 to 20 microliters, 1 to 100 microliters, 1 to 200 microliters, 1 to 300 microliters, and from 1 to 1250 microliters, for example. In some embodiments, the volumes pipette tips described herein can manipulate are larger than the volume designation given that particular pipette tip. For example, a pipette tip designated as suitable to manipulate volumes up to 300 microliters, can sometimes be used to manipulate volumes up to about 1%, 2%, 3%, 5%, 10%, 15% or sometimes as much as up to about 20% larger than the designated pipette tip volume.
Methods of Manufacture
Pipette tips may be manufactured by injection molding. In some embodiments, pipette tips described herein are injection molded as a unitary construct. Injection molding is a manufacturing process for producing objects (e.g., pipette tips, for example) from thermoplastic (e.g., nylon, polypropylene, polyethylene, polystyrene and the like, for example) and thermosetting plastic (e.g., epoxy and phenolics, for example) materials. In some embodiments, a polymer is chosen from low density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), high impact polystyrene (HIPS), polyvinyl chloride (PVC), amorphous polyethylene terephthalate (APET), polycarbonate (PC) and polyethylene (PE). Pipette tips can include, or can be manufactured from, a recyclable material and/or degradable material (e.g., a bio-degradable material), non-limiting examples of which are disclosed in International Application no. PCT/US2009/063762 filed on Nov. 9, 2009 and published as WO 2010/054337 on May 14, 2010. Pipette tips, in some embodiments, include an anti-microbial agent, non-limiting examples of which are disclosed in International Application no. PCT/US2009/047541 filed on Jun. 16, 2009.
The plastic material of choice often is fed into a heated barrel, mixed, and forced into a mold cavity where it cools and hardens to the configuration of the mold cavity. The melted material sometimes is forced or injected into the mold cavity, through openings (e.g., a sprue), under pressure. A pressure injection method ensures the complete filling of the mold with the melted plastic. After the mold cools, the mold portions are separated, and the molded object is ejected. In some embodiments, additional additives can be included in the plastic or heated barrel to give the final product additional properties (e.g., anti-microbial properties, anti-static properties, anti-foaming function and combinations thereof, for example).
A mold is configured to hold the molten plastic in the correct geometry to yield the desired product upon cooling of the plastic. Injection molds sometimes are made of two or more parts, and comprise a core pin. The core pin sometimes can determine the thickness of the object wall, as the distance between the core pin and the outer mold portion is the wall thickness. Molds are typically designed so that the molded part reliably remains on the core pin when the mold opens, after cooling. The core pin sometimes can be referred to as the ejector side of the mold. The molded part can then fall freely away from the mold when ejected from the core pin, or ejector side of the mold. In some embodiments, ejector pins and/or an ejector sleeve push the pipette tip from the core pin.
Also provided herein is a mold for manufacturing a pipette tip by an injection mold process, which comprises a body that forms an exterior portion of the pipette tip and a member that forms an inner surface of the pipette tip, where the member comprises an irregular surface that results in a portion of the inner surface that is irregular (e.g., annular groove). In some embodiments, the member is a core pin for forming the inner surface of a pipette tip.
Provided also herein is a method for manufacturing a pipette tip comprising (a) contacting a pipette tip mold with a molten polymer, and releasing the formed pipette tip from the mold after cooling, where the pipette tip comprises a proximal region and a distal region, and further where the proximal region comprises an exterior surface and an annular flange at the proximal terminus of the proximal region and the proximal region comprises axially oriented grooves and panels circumferentially spaced around the exterior surface of the proximal region. In some embodiments, a pipette tip has a distal region that has a continuous taper of a pipette tip wall surface to form an edge or boundary of minimal thickness.
Provided also herein is a method for manufacturing a pipette tip comprising (a) contacting a pipette tip mold with a molten polymer, and releasing the formed pipette tip from the mold after cooling, where the pipette tip comprises a proximal region and a distal region, and further where the proximal region comprises an interior surface comprising axially oriented grooves and panels circumferentially spaced around the interior surface of the proximal region. In some embodiments, a pipette tip has a distal region that has a continuous taper of a pipette tip wall surface to form an edge or boundary of minimal thickness.
Provided hereafter are non-limiting examples of certain embodiments of the technology.
A1. A pipette tip comprising an exterior surface, an interior surface, a proximal region, a distal region and a junction between the proximal region and the distal region,
A2. The pipette tip of embodiment A1, wherein the distance between a groove floor and an interior surface of a pipette tip opposite the groove floor is about 0.012 inches or less.
A3. The pipette tip of embodiment A2, wherein the distance between a groove floor and an interior surface of a pipette tip opposite the groove floor is about 0.08 inches or less.
A3.1. The pipette tip of embodiment A3, wherein the distance between a groove floor and an interior surface of a pipette tip opposite the groove floor is about 0.05 inches or less.
A3.2. The pipette tip of embodiment A3.1, wherein the distance between a groove floor and an interior surface of a pipette tip opposite the groove floor is about 0.03 inches or
A4. The pipette tip of any one of embodiments A1-A3.2, wherein the distance between a groove floor and an interior surface of a pipette tip opposite the groove floor is substantially the same for two or more of the grooves on the pipette tip.
A4.1 The pipette tip of embodiment A4, wherein the distance between a groove floor and an interior surface of a pipette tip opposite the groove floor is substantially the same for all of the grooves.
A5. The pipette tip of embodiment A4.1, wherein for one or more of the grooves the distance between a groove floor and an interior surface of a pipette tip opposite the groove floor is substantially the same from the flange to the shoulder.
A6. The pipette tip of any one of embodiments A1-A5, wherein two or more of the grooves are circumferentially distributed symmetrically around the proximal region.
A6.1. The pipette tip of embodiment A6, wherein the grooves are circumferentially distributed symmetrically around the proximal region.
A6.2. The pipette tip of any one of embodiments A1-A5, wherein two or more of the grooves are circumferentially distributed asymmetrically around the proximal region.
A6.3. The pipette tip of embodiment A6.2, wherein the grooves are circumferentially distributed asymmetrically around the proximal region.
25 A7. The pipette tip of any one of embodiments A1-A6.3, wherein there are three or more grooves.
A8. The pipette tip of any one of embodiments A1-A6.3, wherein there are four or more grooves.
A9. The pipette tip of any one of embodiments A1-A8, wherein the groove width for one or more of the grooves is a linear width of about 0.003 inches to about 0.040 inches.
A10. The pipette tip of any one of embodiments A1-A8 wherein the groove width for one or more of the grooves is a circumferential width of about 5 degrees to about 30 degrees.
A11. The pipette tip of any one of embodiments A1-A10, wherein the groove width for two or more of the grooves is substantially the same.
A11.1. The pipette tip of embodiment A11, wherein the groove width for all of the grooves is substantially the same.
A11.2. The pipette tip of any one of embodiments A1-A10, wherein the groove width is not the same for two or more grooves.
A11.3. The pipette tip of embodiment A11.2, wherein the groove width is not the same for all of the grooves.
A12. The pipette tip of any one of embodiments A1-A11, wherein the groove width for one or more of the grooves is substantially equal from the flange to the shoulder.
A13. The pipette tip of any one of embodiments A1-A12, wherein grooves have a latitudinal profile and two or more of the grooves have stepped, v-shaped or u-shaped latitudinal profiles.
A13.1. The pipette tip of embodiment A13, wherein each groove has a groove floor with a linear, pointed or substantially pointed or curved latitudinal profile.
A14. The pipette tip of any one of embodiments A1-A13.1, wherein two or more of the panels are circumferentially distributed symmetrically around the proximal region.
A14.1. The pipette tip of embodiment A14, wherein the panels are circumferentially distributed symmetrically around the proximal region.
A14.2. The pipette tip of any one of embodiments A1-A14, wherein two or more of the panels are circumferentially distributed asymmetrically around the proximal region.
A14.3. The pipette tip of embodiment A14.2, wherein the panels are circumferentially distributed asymmetrically around the proximal region.
A14.4. The pipette tip of any one of embodiments A1-A14.3, wherein there are three or more panels.
A14.5. The pipette tip of any one of embodiments A1-A14.3, wherein there are four or more panels.
A14.6. The pipette tip of any one of embodiments A1-A14.5, wherein one or more of the panels on the exterior surface of the pipette tip extends from the flange to the shoulder.
A15. The pipette tip of any one of embodiments A1-A14.5, wherein the panel width for one or more of the panels is a linear width of about 0.025 inches to about 0.175 inches.
A16. The pipette tip of any one of embodiments A1-A14.5, wherein the panel width for one or more of the panels is a circumferential width of about 10 degrees to about 175 degrees.
A17. The pipette tip of any one of embodiments A1-A16, wherein the panel width for two or more of the panels is substantially the same.
A17.1. The pipette tip of embodiment A17, wherein the panel width for all of the panels is substantially the same.
A17.2. The pipette tip of any one of embodiments A1-A16, wherein the panel width is not the same for two or more panels.
A17.3. The pipette tip of embodiment A17.2, wherein the panel width is not the same for all of the panels.
A18. The pipette tip of any one of embodiments A1-A17.3, wherein the panel width for one or more of the panels is substantially equal from the flange to the shoulder.
A18.1. The pipette tip of any one of embodiments A1-A18, wherein panels have a latitudinal profile and two or more of the panels have a stepped or curved latitudinal profile.
A18.2. The pipette tip of embodiment A18.1, wherein each panel has a panel face with a linear or curved latitudinal profile.
A18.3 The pipette tip of embodiment A18.1, wherein each panel has a panel sidewall with a stepped, beveled or curved latitudinal profile.
A19. The pipette tip of any one of embodiments A1-A18.3, wherein each panel width is at least two times greater than each groove width.
A20. The pipette tip of embodiment A19, wherein each panel width is at least five times greater than each groove width.
A21. The pipette tip of embodiment A20, wherein each panel width is at least ten times greater than each groove width.
A22. The pipette tip of any one of embodiments A1-A21, wherein the distance between a panel face and an interior surface of a pipette tip opposite the panel face is about 0.010 inches to about 0.040 inches.
A23. The pipette tip of any one of embodiment A1 to A22, wherein the distance between a panel face and an interior surface of a pipette tip opposite the panel face for two or more of the panels is substantially the same.
A23.1. The pipette tip of embodiment A23, wherein the distance between a panel face and an interior surface of a pipette tip opposite the panel face for all of the panels is substantially the same.
A24. The pipette tip of any one of embodiments A1 to A23.1, wherein the distance between a panel face and an interior surface of a pipette tip opposite the panel face for one or more of the panels is substantially the same from the flange to the shoulder.
A25. The pipette tip of any one of embodiments A1-A24, wherein one or more of the panels comprises a protrusion.
A26. The pipette tip of embodiment A25, wherein all of the panels comprise a protrusion.
A27. The pipette tip of embodiment A25 or A26, wherein each protrusion comprises a protrusion face and each panel comprises a transition surface between the panel face and the protrusion face.
A28. The pipette tip of embodiment A27, wherein the transition surface is stepped, beveled or curved.
A28.1. The pipette tip of embodiment A27, wherein the protrusion face is linear or curved.
A28.2. The pipette tip of any one of embodiments A25-A28.1, wherein the protrusion comprises a protrusion width and the protrusion width for one or more of the protrusions is a linear width of about 0.010 inches to about 0.10 inches.
A29. The pipette tip of any one of embodiments A25-A28.1, wherein the protrusion comprises a protrusion width and the protrusion width for one or more of the protrusions is a circumferential width of about 5 degrees to about 160 degrees.
A29.1 The pipette tip of any one of embodiments A25-A29, wherein the distance between a panel face and a protrusion face is about 0.005 inches to about 0.050 inches.
A30. The pipette tip of any one of embodiments A1-A29.1, wherein the flange comprises a substantially uniform thickness.
A31. The pipette tip of any one of embodiments A1-A30, wherein the flange comprises a distal perimeter and the grooves extend from the flange distal perimeter to the shoulder.
A32. The pipette tip of any one of embodiments A1-A31, wherein the flange comprises a distal perimeter and the panels extend from the flange distal perimeter to the shoulder.
A33. The pipette tip of any one of embodiments A1-A32, wherein the interior surface of the pipette tip comprises an annular groove.
A33.1. The pipette tip of embodiment A33, wherein the annular groove is distal to the sealing zone.
A33.2. The pipette tip of embodiment A33, wherein the annular groove is proximal to the sealing zone.
A34. The pipette tip of any one of embodiments A1-A33.2, wherein the distal region of a pipette tip has a continuous taper of a pipette tip wall surface to form an edge or boundary of minimal thickness.
A34.1. The pipette tip of embodiment A34, wherein the wall thickness tapers from (a) a point at or between (i) about the junction of the proximal region and distal region to (ii) about one-quarter of the axial distance from the terminus of the distal region to the junction, to (b) the distal region terminus, and the wall thickness at the distal region terminus is about 0.0030 inches to about 0.0055 inches.
A35. The pipette tip of embodiment A34.1, wherein the wall thickness at the distal region terminus is about 0.0043 inches to about 0.0050 inches.
A36. The pipette tip of embodiment A35, wherein the wall thickness at the distal region terminus is about 0.0044 inches to about 0.0049 inches.
A37. The pipette tip of any one of embodiments A34-A36, wherein the interior surface of the pipette tip of the distal region is substantially smooth.
A38. The pipette tip of any one of embodiments A34-A37, wherein the pipette tip retains less than 0.065% of the fluid drawn into the pipette tip after the liquid is dispensed.
A39. The pipette tip of any one of embodiments A34-A37, wherein the pipette tip retains no more than 0.00012% of the fluid drawn into the pipette tip after the liquid is dispensed.
A40. The pipette tip of tip of any one of embodiments A1-A39, wherein:
A41. The pipette tip of any one of embodiments A1-A40, wherein the proximal region is capable of hoop stretching at a sealing zone upon insertion of a fluid dispensing device member into the interior of the pipette tip, and wherein the hoop stretching is about 0.001 inches to about 0.005 inches.
A42. The pipette tip of embodiment A41, wherein the hoop stretching is about 0.002 inches to about 0.004 inches.
A43. The pipette tip of embodiment A42, wherein the hoop stretching is about 0.003 inches.
B1. A method for engaging a pipette tip with a fluid dispensing device member comprising inserting a fluid dispensing device member into a pipette tip of any one of embodiments A1-A43 at a force sufficient to form a seal between the fluid dispensing device member and the pipette tip at a sealing zone.
B2. The method of embodiment B1, wherein the proximal region of the pipette tip hoop stretches at the sealing zone, and wherein the amount of hoop stretching is about 0.001 inches to about 0.005 inches.
C1. A pipette tip comprising an exterior surface, an interior surface, a proximal region, a distal region and a junction between the proximal region and the distal region, which proximal region comprises:
C2. The pipette tip of embodiment C1, wherein the distance between a groove floor and an exterior surface of a pipette tip opposite the groove floor is about 0.012 inches or less.
C3. The pipette tip of embodiment C2, wherein the distance between a groove floor and an exterior surface of a pipette tip opposite the groove floor is about 0.008 inches or
C3.1. The pipette tip of embodiment C3, wherein the distance between a groove floor and an exterior surface of a pipette tip opposite the groove floor is about 0.005 inches or less.
C3.2. The pipette tip of embodiment C3.1, wherein the distance between a groove floor and an exterior surface of a pipette tip opposite the groove floor is about 0.003 inches or less.
C4. The pipette tip of any one of embodiments C1-C3.2, wherein the distance between a groove floor and an exterior surface of a pipette tip opposite the groove floor is substantially the same for two or more of the grooves on the pipette tip.
C4.1. The pipette tip of embodiment C4, wherein the distance between a groove floor and an exterior surface of a pipette tip opposite the groove floor is substantially the same for all of the grooves.
C5. The pipette tip of embodiment C4.1, wherein for one or more of the grooves the distance between a groove floor and an exterior surface of a pipette tip opposite the groove floor is substantially the same from the proximal region terminus to the shoulder.
C6. The pipette tip of any one of embodiments C1-C5, wherein two or more of the grooves are circumferentially distributed symmetrically around the proximal region.
C6.1. The pipette tip of embodiment C6, wherein the grooves are circumferentially distributed symmetrically around the proximal region.
C6.2. The pipette tip of any one of embodiments C1-C5, wherein two or more of the grooves are circumferentially distributed asymmetrically around the proximal region.
C6.3. The pipette tip of embodiment C6.2, wherein the grooves are circumferentially distributed asymmetrically around the proximal region.
C7. The pipette tip of any one of embodiments C1-C6.3, wherein there are three or more grooves.
C8. The pipette tip of any one of embodiments C1-C6.3, wherein there are four or more grooves.
C9. The pipette tip of any one of embodiments C1-C8, wherein the groove width for one or more of the grooves is a linear width of about 0.003 inches to about 0.040 inches.
C10. The pipette tip of any one of embodiments C1-C8 wherein the groove width for one or more of the grooves is a circumferential width of about 5 degrees to about 30 degrees.
C11. The pipette tip of any one of embodiments C1-C10, wherein the groove width for two or more of the grooves is substantially the same.
C11.1. The pipette tip of embodiment C11, wherein the groove width for all of the grooves is substantially the same.
C11.2. The pipette tip of any one of embodiments C1-C10, wherein the groove width is not the same for two or more grooves.
C11.3. The pipette tip of embodiment C11.2, wherein the groove width is not the same for all of the grooves.
C12. The pipette tip of any one of embodiments C1-C11.3, wherein the groove width for one or more of the grooves is substantially equal from the proximal region terminus to the shoulder.
C13. The pipette tip of any one of embodiments C1-C12, wherein grooves have a latitudinal profile and two or more of the grooves have stepped, v-shaped or u-shaped latitudinal profiles.
C13.1. The pipette tip of embodiment C13, wherein each groove has a groove floor with a linear, pointed or substantially pointed or curved latitudinal profile.
C14. The pipette tip of any one of embodiments C1-C13.1, wherein two or more of the panels are circumferentially distributed symmetrically around the proximal region.
C14.1. The pipette tip of embodiment C14, wherein the panels are circumferentially distributed symmetrically around the proximal region.
C14.2. The pipette tip of any one of embodiments C1-C14, wherein two or more of the panels are circumferentially distributed asymmetrically around the proximal region.
C14.3. The pipette tip of embodiment C14.2, wherein the panels are circumferentially distributed asymmetrically around the proximal region.
C14.4. The pipette tip of any one of embodiments C1-C14.3, wherein there are three or more panels.
C14.5. The pipette tip of any one of embodiments C1-C14.3, wherein there are four or more panels.
C14.6. The pipette tip of any one of embodiments C1-C14.5, wherein one or more of the panels on the interior surface of the pipette tip extends from the proximal region terminus to the shoulder.
C15. The pipette tip of any one of embodiments C1-C14.5, wherein the panel width for one or more of the panels is a linear width of about 0.025 inches to about 0.175 inches.
C16. The pipette tip of any one of embodiments C1-C14.5, wherein the panel width for one or more of the panels is a circumferential width of about 10 degrees to about 175 degrees.
C17. The pipette tip of any one of embodiments C1-C16, wherein the panel width for two or more of the panels is substantially the same.
C17.1. The pipette tip of embodiment C17, wherein the panel width for all of the panels is substantially the same.
C17.2. The pipette tip of any one of embodiments C1-C16, wherein the panel width is not the same for two or more panels.
C17.3. The pipette tip of embodiment C17.2, wherein the panel width is not the same for all of the panels.
C18. The pipette tip of any one of embodiments C1-C17.3, wherein the panel width for one or more of the panels is substantially equal from the proximal region terminus to the shoulder.
C18.1. The pipette tip of any one of embodiments C1-C18, wherein the panels have a latitudinal profile and two or more of the panels have a stepped or curved latitudinal profile.
C18.2. The pipette tip of embodiment C18.1, wherein each panel has a panel face with a linear or curved latitudinal profile.
C18.3 The pipette tip of embodiment C18.1, wherein each panel has a panel sidewall with a stepped, beveled or curved latitudinal profile.
C19. The pipette tip of any one of embodiments C1-C18.3, wherein each panel width is at least two times greater than each groove width.
C20. The pipette tip of embodiment C19, wherein each panel width is at least five times greater than each groove width.
C21. The pipette tip of embodiment C20, wherein each panel width is at least ten times greater than each groove width.
C22. The pipette tip of any one of embodiments C1-C21, wherein the distance between a panel face and an exterior surface of a pipette tip opposite the panel face is about 0.010 inches to about 0.040 inches.
C23. The pipette tip of any one of embodiment C1 to C22, wherein the distance between a panel face and an exterior surface of a pipette tip opposite the panel face for two or more of the panels is substantially the same.
C23.1. The pipette tip of embodiment C23, wherein the distance between a panel face and an exterior surface of a pipette tip opposite the panel face for all of the panels is substantially the same.
C24. The pipette tip of any one of embodiments C1 to C23.1, wherein the distance between a panel face and an exterior surface of a pipette tip opposite the panel face for one or more of the panels is substantially the same from the proximal region terminus to the shoulder.
C25. The pipette tip of any one of embodiments C1-C24, wherein one or more of the panels comprises a protrusion.
C26. The pipette tip of embodiment C25, wherein all of the panels comprise a protrusion.
C27. The pipette tip of embodiment C25 or C26, wherein each protrusion comprises a protrusion face and each panel comprises a transition surface between the panel face and the protrusion face.
C28. The pipette tip of embodiment C27, wherein the transition surface is stepped, beveled or curved.
C28.1. The pipette tip of embodiment C27, wherein the protrusion face is linear or curved.
C28.2. The pipette tip of any one of embodiments C25-C28.1, wherein the protrusion comprises a protrusion width and the protrusion width for one or more of the protrusions is a linear width of about 0.010 inches to about 0.10 inches.
C29. The pipette tip of any one of embodiments C25-C28.1, wherein the protrusion comprises a protrusion width and the protrusion width for one or more of the protrusions is a circumferential width of about 5 degrees to about 160 degrees.
C29.1. The pipette tip of any one of embodiments C25-C29, wherein the distance between the panel face and the protrusion face is about 0.005 inches to about 0.050 inches.
C30. The pipette tip of any one of embodiments C1-C29.1, wherein the pipette tip comprises an annular groove.
C31. The pipette tip of any one of embodiments C1-C30, wherein the distal region of a pipette tip has a continuous taper of a pipette tip wall surface to form an edge or boundary of minimal thickness.
C31.1. The pipette tip of embodiment C31, wherein the wall thickness tapers from (a) a point at or between (i) about the junction of the proximal region and distal region to (ii) about one-quarter of the axial distance from the terminus of the distal region to the junction, to (b) the distal region terminus, and the wall thickness at the distal region terminus is about 0.0030 inches to about 0.0055 inches.
C32. The pipette tip of embodiment C31.1, wherein the wall thickness at the distal region terminus is about 0.0043 inches to about 0.0050 inches.
C33. The pipette tip of embodiment C32, wherein the wall thickness at the distal region terminus is about 0.0044 inches to about 0.0049 inches.
C34. The pipette tip of any one of embodiments C31-C33, wherein the interior surface of the pipette tip of the distal region is substantially smooth.
C35. The pipette tip of any one of embodiments C31-C34, wherein the pipette tip retains less than 0.065% of the fluid drawn into the pipette tip after the liquid is dispensed.
C36. The pipette tip of any one of embodiments C31-C34, wherein the pipette tip retains no more than 0.00012% of the fluid drawn into the pipette tip after the liquid is dispensed.
C37. The pipette tip of tip of any one of embodiments C1-C36, wherein:
C38. The pipette tip of any one of embodiments C1-C37, wherein the proximal region is capable of compression at a sealing zone upon contact of a fluid dispensing device member with the exterior surface of the pipette tip, and wherein the compression is about 0.001 inches to about 0.005 inches.
C39. The pipette tip of embodiment C38, wherein the compression is about 0.002 inches to about 0.004 inches.
C40. The pipette tip of embodiment C39, wherein the compression is about 0.003 inches.
D1. A method for engaging a pipette tip with a fluid dispensing device member comprising contacting a fluid dispensing device member with the exterior surface of a pipette tip of any one of embodiments C1-C40 at a force sufficient to form a seal between the fluid dispensing device member and the pipette tip at a sealing zone.
D2. The method of embodiment D1, wherein the proximal region of the pipette tip compresses at the sealing zone, and wherein the amount of compression is about 0.001 inches to about 0.005 inches.
E1. A method for manufacturing a pipette tip, comprising:
E2. The method of embodiment E1, wherein the mold comprises a metal.
E3. The method of embodiment E2, wherein the mold is manufactured from a metal.
E4. The method of embodiment E2 or E3, wherein the metal is chosen from aluminum, zinc, steel and a steel alloy.
E5. The method of any one of embodiments E1 to E4, wherein the polymer is chosen from
low density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), high impact polystyrene (HIPS), polyvinyl chloride (PVC), amorphous polyethylene terephthalate (APET), polycarbonate (PC) and polyethylene (PE).
F1. A mold configured to form a pipette tip of any one of embodiments A1-A43 and 01-C40 by a molding process.
F2. The mold of embodiment F1, wherein the mold comprises a metal.
F3. The mold of embodiment F2, wherein the mold is manufactured from a metal.
F4. The mold of embodiment F2 or F3, wherein the metal is chosen from aluminum, zinc, steel and a steel alloy.
F5. The mold of any one of embodiments F1-F4, wherein the molding process is an injection molding process.
The entirety of each patent, patent application, publication and document referenced herein hereby is incorporated by reference. Citation of the above patents, patent applications, publications and documents is not an admission that any of the foregoing is pertinent prior art, nor does it constitute any admission as to the contents or date of these publications or documents. Their citation is not an indication of a search for relevant disclosures. All statements regarding the date(s) or contents of the documents is based on available information and is not an admission as to their accuracy or correctness.
Modifications may be made to the foregoing without departing from the basic aspects of the technology. Although the technology has been described in substantial detail with reference to one or more specific embodiments, those of ordinary skill in the art will recognize that changes may be made to the embodiments specifically disclosed in this application, yet these modifications and improvements are within the scope and spirit of the technology.
The technology illustratively described herein suitably may be practiced in the absence of any element(s) not specifically disclosed herein. Thus, for example, in each instance herein any of the terms “comprising,” “consisting essentially of,” and “consisting of” may be replaced with either of the other two terms. The terms and expressions which have been employed are used as terms of description and not of limitation, and use of such terms and expressions do not exclude any equivalents of the features shown and described or portions thereof, and various modifications are possible within the scope of the technology claimed. The term “a” or “an” can refer to one of or a plurality of the elements it modifies (e.g., “a reagent” can mean one or more reagents) unless it is contextually clear either one of the elements or more than one of the elements is described. The term “about” as used herein refers to a value within 10% of the underlying parameter (i.e., plus or minus 10%), and use of the term “about” at the beginning of a string of values modifies each of the values (i.e., “about 1, 2 and 3” refers to about 1, about 2 and about 3). For example, a weight of “about 100 grams” can include weights between 90 grams and 110 grams. Further, when a listing of values is described herein (e.g., about 50%, 60%, 70%, 80%, 85% or 86%) the listing includes all intermediate and fractional values thereof (e.g., 54%, 85.4%). Thus, it should be understood that although the present technology has been specifically disclosed by representative embodiments and optional features, modification and variation of the concepts herein disclosed may be resorted to by those skilled in the art, and such modifications and variations are considered within the scope of this technology.
Certain embodiments of the technology are set forth in the claim(s) that follow(s).
This patent application is continuation of U.S. application Ser. No. 16/934,878 filed on Jul. 21, 2020, entitled ERGONOMIC PIPETTE TIPS, naming Peter Paul Blaszcak and Arta Motadel as inventors, which is a continuation of U.S. application Ser. No. 16/609,913 filed on Oct. 31, 2019, entitled ERGONOMIC PIPETTE TIPS, naming Peter Paul Blaszcak and Arta Motadel as inventors, which is a 35 U.S.C. 371 national phase patent application of PCT/US2018/O32590, filed on May 14, 2018, entitled ERGONOMIC PIPETTE TIPS, naming Peter Paul Blaszcak and Arta Motadel as inventors, which claims the benefit of U.S. provisional patent application no. 62/507,381 filed May 17, 2017, entitled ERGONOMIC PIPETTE TIPS, naming Peter Paul Blaszcak and Arta Motadel as inventor. The entire content of the foregoing patent application is incorporated herein by reference for all purposes, including all text, tables and drawings.
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| 20210268492 A1 | Sep 2021 | US |
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