A syringe pump and its transmission device

Abstract

The invention discloses an injection pump and a transmission device thereof.The transmission device comprises a screw rod, a semi nut, a moving component, a sliding seat, an elastic component and an electrical driving assembly; the semi nut and the moving component are both slidably arranged on the sliding seat; the moving component can move relative to the semi nut, and the elastic component is connected to the semi nut; when the electrical driving assembly drives the moving component t move to a first position in the direction far away from the screw rod, the semi nut is driven by the moving component to move to the position where the semi nut is separated from the screw rod; when the electrical driving assembly drives the moving component to move to a second position in the direction close to the screw rod, the semi nut is meshed with the screw rod under the action of elastic force of the elastic component, and the moving component and the semi nut are in clearance fit in the sliding direction of the moving component and the semi nut.The electrical driving assembly can be utilized for driving the semi nut to be completely separated from the screw rod, abrasion of threaded teeth is avoided, the service life is prolonged, operation is convenient to conduct, and labor is saved; the semi nut is meshed with the screw rod through elastic force, meshing reliability is guaranteed, the whole structure is simple, and process and machining difficulty is lowered.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to an injection pump and a transmission device thereof. Background technique [0002] The syringe pump is a medical instrument that pumps the liquid medicine into the human body precisely, in a small amount, uniformly and continuously. The operation is convenient, it can be timed and quantified, and the speed and dose can be adjusted at any time according to the needs of the disease, which can reduce the workload of medical staff, improve work efficiency, and accurately, safely and effectively cooperate with medical staff for rescue and treatment. [0003] A syringe pump generally includes a propulsion mechanism, a transmission mechanism and other parts. The working principle of the injection pump is that the motor drives the screw to rotate, and the screw drives the nut engaged with it to move linearly along the axis of the screw. The nut is connected with the propulsion mechanis...

AI Technical Summary

Problems solved by technology

And in the process of pushing and pulling the propulsion mechanism, it is always necessary to press the swing rod to the bottom so that the nut is completely separated from the screw rod, otherwise it is very easy to cause scratches between the nut and the thread tip of the screw rod, which will affect the user experience, and more importantly, the nut will be aggravated. The abnormal wear and tear of the screw and screw teeth reduces the injection accuracy and service life of the syringe pump

Images