Twist-to-charge mechanism of lancing device
Inventors
CHRISTOPHER, James M. • PUSEY, Lauren R. • Rodgers, Jeremy
Assignees
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Publication Number
US-10105086-B2
Publication Date
2018-10-23
Expiration Date
Abstract
A lancing device includes a housing, a lancet carrier translational within the housing, a drive spring for propelling the lancet carrier through a translational lancing stroke, and a charging mechanism. The charging mechanism includes a first cam member that is rotatable relative to the housing, a second cam member that abuts the first cam member, is coupled to the lancet carrier, and is restricted from rotation relative to the housing, and a rotatable handle co-rotationally attached to the first cam member. Rotation of the handle rotates the first cam member with it, causing the first cam member to rotate against the second cam member, which in response traverses axially because it is restricted from rotation, thereby retracting the lancet carrier to a retracted or charged state.
Core Innovation
A lancing device for propelling a lancet through a lancing stroke includes a housing with an axial bore and a lancet carrier translational within the housing through the lancing stroke. The lancet is coupleable to the lancet carrier, and a drive spring propels the lancet carrier forward through the lancing stroke, with the drive spring having a first end and a second end. The first end directly engages the lancet carrier and the second end directly engages the first cam member.
The charging mechanism uses a first cam member mounted within the housing that is rotatable relative to the housing and restricted from axial translation, and a second cam member that abuts the first cam member and is coupled to the lancet carrier to provide co-translation while being restricted from rotation relative to the housing. A rotatable handle is co-rotationally attached to the first cam member, so that rotation of the handle rotates the first cam member therewith. Rotation of the handle causes the first cam member to rotate against the second cam member, and the second cam member translates axially because it is restricted from rotation, thereby retracting the coupled lancet carrier to a charged position.
The first cam member defines a first cam surface with a peak portion and a helical ramp extending about 180 degrees about an axis of the first cam member, and the first cam member has an axial bore extending therethrough. The second cam member defines a second cam surface with a peak portion, and the second cam member is contained entirely within the axial bore of the first cam member. Upon rotation of the handle, the peak portion of the first cam surface rotates against the second cam surface until it engages the peak portion of the second cam surface, causing axial translation of the second cam member to retract the coupled lancet carrier to the charged position.
Claims Coverage
The partial content includes two independent claims: one directed to a lancing device, and one directed to a charging mechanism for the lancing device. The claims share the core inventive conversion of handle rotation into axial retraction of a lancet carrier via a restricted second cam member and cam-surface engagement, with the second claim further reciting a helical ramp, peak-to-peak engagement, and containment within an axial bore.
Rotation-to-axial retraction charging mechanism using co-translation cam members
A lancing device comprising a housing including an axial bore, a lancet carrier translational within the housing through the lancing stroke, a drive spring with a first end directly engaging the lancet carrier and a second end directly engaging the first cam member, a first cam member mounted within the housing and rotatable relative to the housing while restricted from axial translation, a second cam member abutting the first cam member and coupled to the lancet carrier to provide co-translation while restricted from rotation relative to the housing, and a rotatable handle co-rotationally attached to the first cam member, wherein rotation of the handle rotates the first cam member against the second cam member so the second cam member translates axially to retract the coupled lancet carrier to a charged position.
Helical-ramp peak engagement charging mechanism contained within an axial bore
A charging mechanism for a lancing device wherein a first cam member mounted within the housing is rotatable relative to the housing and restricted from axial translation, defines a first cam surface with a peak portion and a helical ramp extending about 180 degrees about an axis of the first cam member, and has an axial bore extending therethrough; a second cam member abuts the first cam member, is coupled to the lancet carrier to provide co-translation and is restricted from rotation relative to the housing, and defines a second cam surface having a peak portion; and a rotatable handle co-rotationally attached to the first cam member, wherein rotation of the handle rotates the first cam member so the peak portion of the first cam surface rotates against the second cam surface until it engages the peak portion of the second cam surface, thereby axially translating the second cam member to retract the coupled lancet carrier to a charged position, with the second cam member contained entirely within the axial bore of the first cam member.
Across the independent claims, the main inventive focus is the charging mechanism that converts rotation of a rotatable handle into axial translation of a rotation-restricted second cam member coupled to a translational lancet carrier, retracting the lancet carrier into a charged position, with the second claim further specifying a helical ramp about 180 degrees, peak-to-peak cam-surface engagement, and containment of the second cam member entirely within the axial bore of the first cam member.
Stated Advantages
Documented Applications
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