Delivery system for implantable medical device and control handle thereof, implantable medical device and securing method, loading method, and releasing method therefor

Abstract

A delivery system for implantable medical device and control handle thereof are provided. Also provided is an implantable medical device and securing method, loading method, and releasing method therefor. The delivery system includes a balloon catheter; a sheath in sliding fit over the balloon catheter and for covering the implantable medical device; an adjustment string for releasably securing the implantable medical device over the balloon catheter, one end of the adjustment string is capable of being fixed to the balloon catheter, and the other end is capable of passing through the implantable medical device and has an eyelet; and a locking wire having relative locked and unlocked states. In the locked state, the locking wire passes through the eyelet to restrain the implantable medical device, and in the unlocked state, the locking wire disengages from the eyelet to release the implantable medical device.

What is claimed is: 
     
         1 . A delivery system for implantable medical device, comprising a balloon catheter, and further comprising:
 a sheath in sliding fit over the balloon catheter and for covering the implantable medical device;   an adjustment string for releasably securing the implantable medical device over the balloon catheter, one end of the adjustment string is capable of being fixed to the balloon catheter, and the other end is capable of passing through the implantable medical device and has an eyelet; and   a locking wire having relative locked and unlocked states, wherein in the locked state, the locking wire passes through the eyelet to restrain the implantable medical device, and in the unlocked state, the locking wire disengages from the eyelet to release the implantable medical device.   
     
     
         2 . The delivery system for implantable medical device according to  claim 1 , wherein there is only one joint between the adjustment string and the locking wire. 
     
     
         3 . The delivery system for implantable medical device according to  claim 1 , wherein there are at least two joints between the adjustment string and the locking wire, and wherein at least one of the joints restricts movement of the implantable medical device in a distal direction, and at least another one restricts movement of the implantable medical device in a proximal direction. 
     
     
         4 . The delivery system for implantable medical device according to  claim 1 , wherein the implantable medical device is provided with a ring, and in the locked state, an end of the adjustment string having the eyelet engages with the locking wire after passing through the corresponding ring to restrain the implantable medical device. 
     
     
         5 . The delivery system for implantable medical device according to  claim 4 , wherein the adjustment string comprises:
 a first adjustment string having a first eyelet and connected to the balloon catheter and adjacent to a distal end of the balloon catheter; and   a second adjustment string having a second eyelet and connected to the balloon catheter and adjacent to a proximal end of the balloon catheter;   wherein at least two rings are provided, which are provided at two opposite ends of the implantable medical device; and   wherein in the locked state, the locking wire passes through the first eyelet and the second eyelet as well as at least two rings simultaneously.   
     
     
         6 . The delivery system for implantable medical device according to  claim 5 , wherein the first adjustment string and the second adjustment string are both movably connected to the balloon catheter. 
     
     
         7 . The delivery system for implantable medical device according to  claim 4 , wherein the implantable medical device has a tubular device body, and the end of the adjustment string having the eyelet is threaded from an interior of the device body radially towards an exterior of the device body. 
     
     
         8 . The delivery system for implantable medical device according to  claim 1 , wherein the delivery system further comprises a control handle, to which all of the balloon catheter, the sheath and the locking wire extend, and the balloon catheter, the sheath, and the locking wire are movable relative to each other. 
     
     
         9 . The delivery system for implantable medical device according to  claim 8 , wherein the control handle comprises a limiting port for threading the locking wire. 
     
     
         10 . The delivery system for implantable medical device according to  claim 8 , wherein the control handle for operating the implantable medical device comprises a support and a first driving assembly provided on the support, and wherein the first driving assembly comprises:
 a first mounting base slidably arranged on the support; and   a first driving member movably arranged on the support and in transmission fit with the first mounting base; and   wherein the first mounting base comprises a main body with a lumen, and ports opened in the main body and communicated with the lumen:
 a distal port for docking with the balloon catheter; and 
 a driving port for injecting fluid into the balloon catheter. 
   
     
     
         11 . The delivery system for implantable medical device according to  claim 10 , wherein the control handle further comprises a second driving assembly provided on the support, the second driving assembly is proximal to the first driving assembly, and the second driving assembly comprises:
 a second mounting base slidably arranged on the support and connected with the sheath; and   a second driving member movably arranged on the support and in transmission fit with the second mounting base.   
     
     
         12 . The delivery system for implantable medical device according to  claim 11 , wherein the balloon catheter comprises a catheter body which is communicated with the balloon and extends toward a proximal end of the delivery system; and
 the delivery system further comprises a bending member which is located inside, outside, or sandwiched in a wall of the catheter body, and distal portions of the bending member and the catheter body are configured to interact with each other so as to bend a distal portion of the balloon catheter.   
     
     
         13 . The delivery system for implantable medical device according to  claim 12 , wherein a proximal end of the bending member is connected to and controlled by the control handle. 
     
     
         14 . The delivery system for implantable medical device according to  claim 13 , wherein the bending member is a bending wire or a bending tube, and wherein distal ends of the bending member and the catheter body are fixed with each, and proximal ends are in sliding fit so as to bend the distal portion of the balloon catheter. 
     
     
         15 . The delivery system for implantable medical device according to  claim 13 , wherein the control handle further comprises a third driving assembly provided on the support, the third driving assembly is between the first and second driving assemblies, and the third driving assembly comprises:
 a fixed mounting base;   a third mounting base slidably arranged on the support and connected with the bending member; and   a third driving member movably arranged on the support, and in transmission fit with the third mounting base.   
     
     
         16 . The delivery system for implantable medical device according to  claim 15 , wherein the support has an axial direction, the support is provided with guide grooves extending along the axial direction, and the mounting bases are slidably arranged in the corresponding guide grooves; and the driving members are respectively rotatably provided around the support, and in thread fit with the corresponding mounting bases. 
     
     
         17 . The delivery system for implantable medical device according to  claim 1 , wherein the implantable medical device comprises a stent and leaflets connected to the stent, wherein the stent is a radially deformable structure and has relative crimped and expanded states, and the implantable medical device further comprises a restraint ring connected to and around the stent, and the restraint ring is configured to restrain a radial deformation of the stent when the stent transforms into the expanded state. 
     
     
         18 . A delivery system for implantable medical device, comprising a balloon catheter, further comprising:
 a sheath in sliding fit over the balloon catheter and for covering the implantable medical device;   an adjustment string for releasably securing the implantable medical device over the balloon catheter, one end of the adjustment string is capable of being fixed to the balloon catheter, and the other end and has an eyelet is capable of passing through the implantable medical device; and   a locking wire having relative locked and unlocked states, wherein in the locked state, the locking wire passes through the implantable medical device to limit detachment of the implantable medical device from the adjustment string, and in the unlocked state, the locking wire is detached from the implantable medical device, allowing the eyelet to disengage from and release the implantable medical device.   
     
     
         19 . An implantable system, comprising an implantable medical device and a delivery system engaged with the implantable medical device; wherein the delivery system is the delivery system for implantable medical device according to  claim 1 . 
     
     
         20 . The implantable system according to  claim 19 , wherein the implantable medical device is a prosthetic heart valve.