Injection method and apparatus

A device, a technology for dose setting, used in syringes, auto-injectors, hypodermic instruments, etc.

Inactive Publication Date: 2008-12-10
OWEN MUMFORD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The user disengages the ratchet teeth with a slide trigger that engages the outside of the pen body, causing the spring to unwind

Method used

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  • Injection method and apparatus
  • Injection method and apparatus
  • Injection method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] figure 1 A pen injector with a user-operable dose setting mechanism is shown in . Referring to Figures 2-7, it can be seen that the syringe comprises a main body 1 and a cap 20 which are lap-fitted together. The characteristic ring 19 is color coded to indicate the type of drug to be delivered by the syringe. Threads are provided on the inner surface of the main body 1 at the upper end of the main body. This internal thread is engaged by an external thread 2 a provided on the outer surface of the dose knob 2 . exist Figure 5Dose Knob 2 is shown in detail. The longitudinal movement of the dose knob 2 within the pen body 1 is restricted in two directions. A cartridge housing 18 is secured to the lower end of the main body 1 and is arranged to house a disposable drug filling cartridge (not shown). Such cartridges have a rubber cover that seals one end of the cartridge and the other end is positioned to accommodate a disposable needle. The cartridge is typically mul...

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PUM

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Abstract

A pen-type injector for receiving a medication containing member. The injector comprises a housing (1) and a torsion spring (4) contained within the housing and coupled to a drive member (8). A dose setting knob (2) is coupled to the spring (4), and rotatably coupled to the housing (1) such that rotation of the knob relative to the housing in a first direction results in compression or twisting of the spring. A user actuable trigger (12) is provided for releasing the spring (4) to push the drive member (8) through the housing (1). A user actuable button (6) is coupled to the housing (1) for axial motion relative thereto, said button (6) being coupled to the torsion spring (4) to cause the spring to unwind or expand in discrete steps with each press of the button.

Description

technical field [0001] The present invention relates to an injection method and device, in particular, to an injection method and device providing automatic drug delivery and variable dose setting. Background technique [0002] US 5,104,380 describes a commonly used pen-type injector provided with dose metering means provided by a cap or "dose knob" which is rotatable relative to the pen body to the point to be injected drug dose-related position. Rotation compresses (by twisting) the torsion spring, which is prevented from loosening by cooperating teeth. The user disengages the ratchet teeth with a slide trigger that engages the outside of the pen body, causing unwinding of the spring. This in turn causes the drive gear coupled to the plunger to rotate through the fast pitch threads. Rotation of the gear moves the plunger axially through the pen body. The plunger acts on the "plug" of the drug-containing cartridge, driving the drug from the cartridge as the plunger trav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/315A61M5/20
CPCA61M5/20A61M5/31535A61M5/31543A61M5/3155A61M5/31553A61M5/3156A61M5/31583A61M2205/581A61M2205/583A61M2205/6081
Inventor 杰米·马歇尔马克·伊顿
Owner OWEN MUMFORD
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