Support delivery device

Abstract

The invention discloses a delivery device used for an interventional therapy shape memory support. The delivery device comprises a handle and a conduit, wherein the conduit consists of an inner core and a sheathing canal which are sheathed, and the remote end of the inner core and the sheathing pipe are matched for placing the support; the handle consists of a hollow tubular shell, a speed regulation assembly arranged at the near end of the shell, and a screw rod arranged in the shell; the speed regulation assembly is of a planetary gear structure and comprises a sun gear, an outer gear ring and a plurality of planetary gears, and the outer gear ring and the near end of the screw rod are fixed; the remote end of the shell is connected with the near end of the inner core; the near end of the sheathing pipe is further connected with a fastener structure capable of being meshed with the screw rod. The speed regulation assembly has a two-level speed regulation function, and can be used for accurately regulating the release position and speed of the support, and also recovering the support to the delivery device so as to perform repositioning if displacement exists in the release process.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a delivery device for a shape-memory bracket used in interventional therapy. Background technique [0002] At present, stents made of shape memory materials have been widely used in arterial stent grafts, arterial occluders, aortic valves, etc. for interventional surgery due to their excellent shape retention properties and good biocompatibility. All kinds of stents are sent into the surgical area through the delivery device; the delivery device usually includes a sheath and an inner core, and the stent is compressed and wrapped between the sheath and the inner core at the distal end of the delivery device. After the stent is sent into the surgical area, the sheath is withdrawn The tube, stent self-expands and releases, allowing it to return to its original shape and secure in place in the surgical field. However, the currently used delivery device cannot adjust the rele...

AI Technical Summary

Problems solved by technology

However, the currently used delivery device cannot adjust the release speed and position of the stent according to the actual situation of the operation when it is withdrawn, and the stent is prone to shift, and if the stent is displaced during the stent release process, the stent cannot be retracted. Adverse reactions, severe ones lead to surgical failure and endanger the lives of patients

The inner core of the currently used stent is obtained by extrusion or injection molding of plastic material, which has high hardness and poor flexural performance, which is not conducive to the smooth passage of the stent through the lesion site, and is easy to damage the patient's blood vessel wall, causing adverse sequelae; if it is not handled properly , can also cause complications such as cerebral thrombosis in patients

Images