Implant conveying system

Abstract

The invention discloses an implant conveying system, which comprises an inner sheath canal, an inner sheath core pipe which runs through the inner sheath canal and distal end of which extends out of the inner sheath canal, and an outer sheath canal which movably sleeves the exterior of the inner sheath canal and defines a cavity with the inner sheath core pipe, and further comprises at least one hooking unit which is fixed to the outer surface of the inner sheath core pipe, wherein the at least one hooking unit comprises at least two flexible hooking pieces; each hooking piece comprises a fixed part which is connected to the outer surface of the inner sheath core pipe and a deformed part which is connected to the fixed part; and the free end of each deformed part can get bent relative to the fixed part and the free end, when being accommodated within the cavity between the outer sheath canal and the inner sheath core pipe, is matched with the fixed part, so that a hook-shaped object isdefined. According to the implant conveying system provided by the invention, an implant can be fixed to the inner sheath core pipe via the at least one hooking unit, so that the implant is limited from moving. Therefore, in an implant conveying process, the implant is prevented getting deviated from the inner sheath core pipe; and in a release process, early release of the implant can be avoidedwhen the release position of the implant needs to be adjusted.

Description

technical field [0001] The invention relates to an implantable medical device, in particular to a delivery system for the implant. Background technique [0002] For diseases such as vascular stenosis, aneurysm, and vascular dissection, interventional surgery with luminal stents has the advantages of less trauma, faster recovery, fewer complications, and better therapeutic effects. [0003] The metal skeleton structure of the self-expanding stent luminal stent is usually made of nickel-titanium alloy, and after a heat setting process, the luminal stent has the ability to restore its own shape. At present, the tube body of the delivery system of this type of stent generally includes an outer sheath tube and an inner sheath core tube pre-installed in the outer sheath tube. The proximal end of the inner sheath core tube is thicker and the distal end is thinner. The lumen stent is accommodated in the cavity between the outer sheath tube and the distal part of the inner sheath co...

AI Technical Summary

Problems solved by technology

However, this delivery system still has the following defects: (1) During the delivery of the endoluminal stent, when the outer sheath tube and the sheath core tube pass through the curved part of the human lumen together, at the side where the bending radius of the curved blood vessel is smaller On the side of the sheath core tube and the outer sheath tube, the gap between the sheath core tube and the outer sheath tube decreases; on the side where the bending radius of the curved blood vessel is larger, the gap between the sheath core tube and the outer sheath tube increases, and at this time, the rigid protrusion and the outer sheath tube The distance between the inner walls of the sheath increases, and the rigid protrusions are easier to separate from the lumen stent, and the lumen stent may break away from the constraints of the protrusions, which will cause the position of the lumen stent to shift in the outer sheath, affecting the subsequent release

(2) When the sheath core tube and the outer sheath tube reach the lesion site, when the operator withdraws the outer sheath tube to release the luminal stent, the luminal stent may be quickly and completely released from the outer sheath tube. If the release position is not ideal, it cannot Adjust the release position

(3) After the luminal stent is partially released from the outer sheath, if the release position of the luminal stent is found to be unsatisfactory, the distal position of the outer sheath needs to be adjusted, and the luminal stent may be released from the outer sheath during the adjustment process. full early release

Images