Push injector for conveying viscoelastic agent

Abstract

The invention discloses a push injector for conveying a viscoelastic agent. The push injector comprises an injector body for containing the viscoelastic agent, a driving mechanism for applying force to output the viscoelastic agent out from the injector body, and a main body support for installing the injector body and the driving mechanism; the injector body comprises a push rod and a flange; thedriving mechanism comprises a lead screw nut, a lead screw, a first rolling bearing, a clutch, a coupler and a gear motor; the flange is internally bucked to the lead screw nut through a push rod lock catch and used for fixing the axial position of the push rod; the radial position and axial position of the lead screw are fixed through the first rolling bearing; a bevel gear is arranged at the tail end of the lead screw, and an internal bevel gear meshed with the bevel gear is arranged at the front end of the clutch; a transmission shaft is arranged at the rear end of the clutch, and the transmission shaft is connected with an output shaft of the gear motor through the coupler. The push injector can convey the viscoelastic agent continuously, manual and automatic conveying is realized, operation is flexible, and the defects of low precision and high control difficulty of annual conveying are overcome.

Description

technical field [0001] The invention relates to the field of medical device injection devices, in particular to a push injector for conveying viscoelastic agents. Background technique [0002] In ophthalmic surgery, specific surgical auxiliaries (such as elastic viscous medium) are often injected into the eyes of the human body through a syringe. For example, a certain elastic viscous medium is injected into the front of the eyes of patients with cataracts to form a film of a certain thickness, which can isolate the cornea from mechanical damage. [0003] Since the injection site is an ocular surgery, the injected dose should be strictly controlled; however, for the injection method of viscous media, the operator usually controls the syringe with bare hands to deliver to the corresponding site. Because the drug is made of high-viscosity material, viscous resistance cannot be avoided in the injection cavity, which requires extremely high operating requirements for the operat...

AI Technical Summary

Problems solved by technology

Moreover, the bolus injection handle adopts a manual screw-in propulsion structure, which needs to be carefully operated by the hands of the operator, and the process is prone to medical accidents caused by over- or under-injection

[0005] Therefore, it is now required to realize continuous and uninterrupted delivery of viscoelastic agents in ophthalmic surgery, and to realize automatic delivery as much as possible to make up for the defects of low precision and difficult control of manual delivery.

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