STENT HOLDING SYSTEMS Russian patent published in 2015 - IPC A61F2/962 A61F2/966 

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment, namely to an implant delivery system to a segment of a body cavity, particularly to an expandable implant (e.g. stent) delivery systems. The stent delivery system comprises an expandable stent, an elongated inner element, a holding element and a coating. The stent has proximal and distal ends and a first fixing structure. The elongated inner element specifies a long axis. The holding element is fastened to the elongated inner element and comprises a second fixing structure configured to interact to the first fixing structure of the stent. The holding element is configured to move longitudinally in relation to the elongated inner element. The coating is mounted on the elongated inner element and configured to be arranged in the travelling position, wherein the coating covers the stent, and in the placing position, wherein the stent is opened at least partially. According to the second implementation, the system comprises a deformable holding ring surrounding the elongated element. The deformable holding ring sets a coating diameter so that if the coating is found in the travelling position, the deformable holding ring is compressed by the coating so that an outer end of the deformable holding ring is pressed into a proximal end of the stent, and after the coating is shifted into the placing position, the above outer end of the deformable holding ring is released from the coating contact to enable moving and opening the proximal end of the stent and releasing the above stent. According to the third embodiment, the system comprises an elongated element having a stent attachment section comprising a compressible material. In the travelling position, the coating compresses the stent so that the stent cells are pressed into the compressible material and entraps it, and in the placing position, which enables releasing the stent from the coating and providing the stent travelling into an expanded configuration released from the compressible material. According to the fourth embodiment, the system comprises the elongated inner element, the expandable stent, the generally ring holder and the coating. The stent tightly adjoins the distal end of the elongated inner element. The holder is fastened to the inner element and has a size adequate for the detachable connection with the expandable stent and for the longitudinal travel along the elongated inner element. The coating is mounted on the elongated inner element and configured to travel from the travelling position, wherein the coating covers the stent, into the placing position, wherein the stent is opened at least partially.

EFFECT: invention enables holding the stent on a catheter, even if a major portion of the stent is opened by driving back the coating, and enables the re-closing of the stent even after the major portion of the stent is opened by driving back the coating that makes it possible to adjust the stent position after it is partially released.

23 cl, 16 dwg