Medicament injection devive with axially displaceable lead screw

A technology of lead screw and rotary drive device, applied in the direction of syringes, ampoule syringes, hypodermic injection devices, etc., which can solve the problems of unfavorable disassembly and reassembly of cartridges

Inactive Publication Date: 2005-05-25
DCA DESIGN INTERNATIONAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such disassembly and reassembly when changing cartridges is disadvantageous if the user, usually diabetic, is infirm or has poor eyesight

Method used

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  • Medicament injection devive with axially displaceable lead screw
  • Medicament injection devive with axially displaceable lead screw
  • Medicament injection devive with axially displaceable lead screw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] general reference Figure 1-5 , and specifically refer to figure 1 , which shows a drug delivery device 2 comprising a main housing 3 in which are arranged a number of components including a replaceable cartridge 4, a plunger in the form of a lead screw 6 and drive The driving device 8 of the plunger, which drives the piston 5 in the cartridge 4 to discharge the drug, can also provide a power source such as a battery 18 to provide power to the driving device 8 . The drug delivery device 2 may also comprise a display 10 via which certain information regarding the operation and / or use of the drug delivery device may be conveyed to the user.

[0021] A central control unit or microprocessor (not shown) may also be provided to control the operation of the drug delivery device 2 and determine the nature of the information displayed on the display 10 .

[0022] The plunger and drive are in Figure 2 to Figure 5 is shown most clearly. The motor 12 is connected to drive the...

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PUM

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Abstract

The present invention relates to a drug delivery device in which the drug to be delivered is stored in a cartridge having a movable piston inside it. The movable piston is driven by a lead screw (6) to expel the drug, which lead screw (6) is advanced and retracted by suitable drive means (14). Provide a guide slot (16) through which the lead screw can pass. However, in known devices the guide slots are held in place by other parts of the device. Such devices are complex to manufacture. Additionally, they may need to be disassembled and reassembled when changing cartridges. This is disadvantageous if the user, usually diabetic, is weak or has poor eyesight. The drug delivery device disclosed in the present invention includes a main housing (3), a threaded lead screw (6) with opposite flat surfaces, a rotary drive (14) and a guide sleeve (16), the rotary drive has a corresponding On the inner wall surface of the relatively flat surface of the lead screw, the guide sleeve has a hole for receiving the threaded lead screw, wherein the guide sleeve is permanently fixed to the main housing.

Description

technical field [0001] The present invention relates to a drug delivery device, such as an injection or infusion device. In particular, the invention finds particular, but not exclusive use in a drug delivery device in which the drug to be delivered is stored in a replaceable cartridge having a movable piston inside it. Such devices are commonly used, for example, by diabetics for the administration of insulin. Background technique [0002] In such devices, a lead screw or other plunger drives a movable piston to expel the drug. The lead screw can be easily advanced or retracted by a suitable drive. It is known to provide a drive mechanism in which the rotational motion of an electric motor or other suitable drive means is converted into linear motion of a lead screw. [0003] It is known to provide a guide slot or bushing through which the lead screw can move. However, in known devices the guide slots are held in the desired operative position by other components of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/142A61M5/145
CPCA61M5/14244A61M5/14566A61M5/142A61M5/145A61M5/24
Inventor R·F·维齐J·A·霍尔德盖特
Owner DCA DESIGN INTERNATIONAL LTD
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