Apparatuses for securing components of a drug delivery system during transport and methods of using same
An assembly of a drug delivery system, comprising: a first component; a second component which is configured to move linearly with respect to the first component; and, a resistance element configured to resist linear movement during transport of the first component with respect to the second component in a closed transport configuration but which is adapted to be overcome during nominal operation of the drug delivery system.
1. A telescoping assembly of a drug delivery injector, comprising:
a first component having a threaded member;
a second component nested concentrically around a portion of the first component and threadedly linked with the threaded member of the first component, the second component being configured to move linearly with respect to the first component upon application of torque to one of the first or second components;
a pushing cover attachable to a piston positioned within a drug cartridge of the drug delivery injector, the second component being spaced from the pushing cover in a transport configuration of the telescoping assembly, thereby defining a gap therebetween;
wherein a first threaded portion of said threaded member, threadedly engaged by the second component during linear movement of the second component through the gap and into engagement with the pushing cover, is configured with increased friction relative to a remainder of the threaded member, thereby initially resisting linear movement of the second component through the gap.
2. The telescoping assembly of claim 1 , wherein said first threaded portion of the threaded member is provided with increased friction by making at least one spacing between a thread and the next thread tighter.
3. The telescoping assembly of claim 1 , wherein said first threaded portion of the threaded member is provided with increased friction by making at least one thread less deep than the other threads of the threaded member.
4. The telescoping assembly of claim 1 , wherein said first threaded portion of the threaded member is provided with increased friction by altering the shape thereof to increase friction between threads as the threaded member turns.
5. The telescoping assembly of claim 1 , wherein said first threaded portion of the threaded member is provided with increased friction by coating said first threaded portion with at least one of an abrasive material and an adhesive material.
6. The telescoping assembly of claim 1 , further comprising:
a third component nested and threadedly linked with the first and second components, wherein the third component is configured to move linearly with respect to the first component upon application of torque to the first component.
7. The telescoping assembly of claim 6 , wherein the second component is concentrically arranged between the first and third components.