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Electromagnetic drive for needle-free injection

An electromagnetic drive, needle-free injection technology, applied in the medical field, can solve the problems of low limit reliability, large output, small output, etc., to achieve the effect of improving the magnetic driving force, enhancing the magnetic field, and overcoming the low reliability

Active Publication Date: 2022-04-08
NAT UNIV OF SINGAPORE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on this, it is necessary to address the problems of low output force and low limit reliability of existing electromagnetic needle-free injectors, and provide an electromagnetic injection device for needle-free injection that has a strong magnetic field, large output force, and does not depend on current to achieve reliable limit. drive unit

Method used

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  • Electromagnetic drive for needle-free injection
  • Electromagnetic drive for needle-free injection
  • Electromagnetic drive for needle-free injection

Examples

Experimental program
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Effect test

Embodiment 1

[0047] figure 2 A schematic structural diagram of the electromagnetic drive device according to Embodiment 1 of the present invention is shown. The electromagnetic drive device includes a sheath 201 , a frame 202 , an outer circular iron core 204 , an outer magnet assembly 205 , an inner circular iron core 206 , an inner magnet assembly 207 , an end cover 208 and a spacer 209 .

[0048] The sheath 201 is cylindrical and includes a top opening and a bottom opening. The skeleton 202 is configured to be movably connected to the sheath 201, the skeleton 202 includes a transmission rod extending out of the top opening and adapted to connect to an injection vessel, and a bobbin on which a coil 203 is wound. The outer circular iron core 204 is arranged on the radially inner wall of the middle part of the sheath 201 . The outer magnet assembly 205 is disposed on the radially inner wall of the outer circular iron core 204 . The inner circular iron core 206 is disposed inside the sh...

Embodiment 2

[0059] Figure 5 A schematic structural diagram of an electromagnetic drive device according to Embodiment 2 of the present invention is shown. The electromagnetic drive device includes a sheath 501 , a skeleton 502 , an outer circular iron core 504 , an outer magnet assembly 505 , an inner circular iron core 506 , an inner magnet assembly 507 , an end cover 508 and a spacer 509 . The structural arrangement of the components of the electromagnetic drive device in Embodiment 2 is substantially the same as that of the electromagnetic drive device in Embodiment 1, except for the structure of the outer magnet assembly 505 and the inner magnet assembly 507 . The different parts of this implementation will be described in detail below, and the same or similar parts will not be repeated.

[0060] refer to Figure 5 and 6 , in this implementation, the outer magnet assembly 505 includes seven outer permanent magnet rings 505a, 505b, 505c, 505d, 505e, 505f, 505g. The first outer per...

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Abstract

An electromagnetic driving device for needle-free injection, comprising a sheath, a skeleton, an outer circular iron core, an outer magnet assembly, an inner circular iron core, and an inner magnet assembly. A coil is wound on the bobbin of the skeleton, and the coil is movably arranged between the outer magnet assembly and the inner magnet assembly, thereby driving the movement of the skeleton. Both the outer magnet assembly and the inner magnet assembly include the same number of permanent magnet rings, and each permanent magnet ring has a specific magnetization direction, so that the magnetic field at the position where the coil is located in the air gap is greatly enhanced, and the edge of the skeleton wound with the coil is improved. Magnetic driving force in the axial direction. In addition, by designing the axial length of each permanent magnet ring, the axial displacement of the skeleton wound with the coil can be automatically limited, which overcomes the defect of low reliability in the prior art that must be limited by controlling the current .

Description

technical field [0001] The present invention relates to the medical field, especially to a needle-free injection device in ophthalmic medicine, in particular to an electromagnetic drive device for needle-free injection. Background technique [0002] With the rapid development of medical science and technology, disease diagnosis, monitoring, sampling and on-site surgical treatment in vivo are becoming more and more minimally invasive and non-invasive, especially for ophthalmic drug injection. While minimizing the pain of the patient, the process of injecting the drug is required to have a speed change so that the drug can reach the lesion quickly. At the same time, higher requirements are put forward in terms of volume, quality and function for ocular drug injection devices. The existing domestic and foreign eye injection devices are still mainly in the form of needles. In recent years, microneedles have appeared, but whether it is ordinary needles or microneedles, it is ine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F9/00A61M5/31A61M5/30H02K41/03
CPCA61M5/30A61M5/31H02K41/031A61M2205/10A61M2205/3317
Inventor 任洪亮孙津济杰彦特·文卡特拉曼尼·艾耶姚木成
Owner NAT UNIV OF SINGAPORE
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