Abstract:
An adapter for connecting an array of pipette tips having through bores with conical upper ends to a multichannel air displacement pipettor having a plurality of ports with compliant internal sealing surfaces. The adapter comprises a planar base with an array of openings extending between its top and bottom surfaces. Sealing tubes project upwardly from the top surface, and tip mounting tubes project downwardly from the bottom surface, with pairs of sealing tubes and tip mounting tubes being arranged coaxially and in communication with respective ones of the openings in the base. The tip mounting tubes are externally dimensioned and configured for insertion into the conical upper ends of the pipette tips, and the sealing tubes are externally configured and dimensioned for insertion into the ports of the pipettor and into sealing interengagement with their compliant internal sealing surfaces.
Abstract:
The technology relates in part to a segmented pipette tip adapter that includes a plurality of plate segments and a junction between adjacent plate segments. Each of the plate segments often includes a proximal surface, a distal surface, edges, one or more nozzles disposed on the proximal surface, and one or more tubular projections disposed on the distal surface. Each of the nozzles often includes a nozzle bore, each of the tubular projections often includes a tubular projection bore, each of the plate segments often includes a plate bore disposed at each of the nozzles, and each nozzle bore often is aligned with a tubular projection bore and a plate bore. Each junction often is between adjacent edges of a pair of adjacent plate segments.
Abstract:
A pipetting system is disclosed that includes a pipette head including a multichannel air displacement system for aspirating and dispensing liquids, a pipetting system base that includes a linear guide system along which the pipette head may be moved vertically with respect to the pipetting system base, and counterbalance means for counterbalancing at least a portion of a weight of the pipette head.
Abstract:
An ejection mechanism for a hand-held pipettor provides for varying degrees of mechanical advantage along the stroke of the ejector button. The ejection mechanism can be used for either hand-held single channel pipettors or hand-held multi-channel pipettors having manually actuated ejection mechanisms.
Abstract:
In one aspect, the invention relates to a pipette tip mounting shaft configuration and a disposable pipette tip having a matching configuration. The mounting shaft (12) includes a locking section (30) located above a lower sealing section (32). The locking section (30) has outwardly extending locking lobes located above a stop member (34) and a lower sealing section (32) located below the stop member (34). When the mounting shaft (12) is fully- inserted into the collar (36) of the mating disposable pipette tip (14), the tip locks onto the mounting shaft (12). The bore of the pipette tip includes a circumferential shelf or shoulder separating its upper collar from the tip sealing area which is located below the circumferential shelf. The tip collar preferably includes a locking ring located at or near the upper opening for the mounting shaft (12). The dimensions of the collar, and in particular the distance between its circumferential shelf and the locking ring, are selected to match the dimensions of the mounting shaft (12) between the stop member (34) and the upper end of the locking lobes, thus locking the pipette tip (14) in a secure, reliable position and orientation while using ergonomic insertion and ejection forces. The locking lobes preferably include a ramp portion that gently flexes and distorts the pipette tip collar (36) out of round as the mounting shaft i(12) s inserted in the pipette tip (14), rather than stretching the tip collar (36). The circumferential shelf on the pipette tip (14) between the tip collar (36) and the barrel (38) isolates the sealing area at the upper end of the barrel (38) from distortion, thus facilitating reliable sealing engagement between the lower sealing section (32) of the mounting shaft (12) and the sealing ring in the upper end of the barrel (38) of the pipette tip (14).
Abstract:
In one aspect, the invention relates to a pipette tip mounting shaft configuration and a disposable pipette tip having a matching configuration. The mounting shaft (112) includes a locking section (130) located above a lower sealing section (132). The locking section (130) has outwardly extending locking lobes (50) located above a stop member (34) and a lower sealing section (132) located below the stop member (34). In certain embodiments, the diameter of the mounting shaft below the stop member is reduced in order to lessen insertion and ejection forces, which is particularly helpful for hand-held multi-channel pipettors. In these embodiments, the lower sealing section contains either a frustoconical sealing section, or an annular groove (135) and a sealing ring (137), such as a f louroelastomeric 0-ring seal. When the mounting shaft is fully inserted into the collar of the mating disposable pipette tip (14), the tip (14) locks onto the mounting shaft (112). The bore of the pipette tip includes a circumferential shelf or shoulder separating its upper collar from the tip sealing area which is located below the circumferential shelf. The tip collar preferably includes a locking ring located at or near the upper opening for the mounting shaft.
Abstract:
A manually directed, electronic multi-channel pipettor uses servo controlled motors to drive a carriage and pipetting head in response to a user's manipulation of a control handle. The pipetting head include an array of tip fittings, e.g. 96. The system includes a check processor to avoid unintended motion in case of system faults or crashes. The system requires substantial force to attach the array of tips, and therefore includes controls that require both of the user's hands be occupied during the tip attachment process.
Abstract:
A manually directed, multi-channel electronic pipetting system is designed to transfer liquids from a standard multi-well plate, deep-well plate or reservoir into another multi-well plate. The preferred pipetting head includes an array of 96-tip fittings. A deck with at least one but preferably two or more wellplate nesting receptacles holds one or more multi-well plates or reagent reservoirs for access by an array of disposable pipette tips mounted to the pipetting head. The electronic motion control system includes a control handle that is mounted to a load cell, the carriage for the pipetting head and is held in the palm of the user. In use, the user grasps the control handle and operates the system in a manner similar to one using a handheld electronic pipettor.
Abstract:
A hand-held, multi-channel pipettor has an electronically controlled motor to reposition pipette tips for different center to center spacing. Each repositionable tip fitting assembly has a cam following pin that is driven by cam tracks in a motor driven roller drum. Stationary ports for the multiple aspiration cylinders are strategically placed to simplify management of flexible tubes leading to the repositionable pipette tip fitting assemblies. The pipettor has a user interface that can be operated conveniently by one hand to reposition pipette tips. It has a pipette tip ejection mechanism with a sinusoidal stripper bar.
Abstract:
The present application provides methods for detecting, diagnosing, monitoring, predicting responsiveness to therapeutic agents and staging cancer. The present application provides methods and compositions useful for suppression of GRP78 expression or activity in cancer cells to overcome resistance of certain therapeutic agents. The present application also provides methods for predicting whether a subject with cancer is at risk for developing resistance to certain therapeutic agents.