| 摘要 |
Device for placement of a self-expanding endoprosthesis, extending between a proximal end and a distal end. An outer sheath (1) is able to keep an endoprosthesis (21) in radial contraction. A mandrel (4), which extends axially inside the outer sheath, is movable axially with respect to the outer sheath and has, at its distal end (3), a chamber (2) able to receive an endoprosthesis (21) in radial contraction, the chamber being delimited at its distal end by an atraumatic tip (6) which can occlude the outer sheath. The atraumatic tip (6) is made of elastomer material that forms a thin-walled inflatable chamber (10) which can be inflated by a pressure insufficient to widen a channel intended to receive the prosthesis, and into which there leads a lumen (9) extending from the distal end to the proximal end of the mandrel for passage of an inflation fluid. |
| 主权项 |
1. A method for placing a self-expanding endoprosthesis (21) in a channel (20) with the aid of a device for placement of the self-expanding endoprosthesis, extending between a proximal end and a distal end, into the channel of a patient, the device comprising: an outer sheath (1) able to keep an endoprosthesis (21) in radial contraction, and a mandrel (4), which extends axially inside the outer sheath (1), is movable axially with respect to the outer sheath, has a chamber (2) which is configured to receive the endoprosthesis (21) in radial contraction, said mandrel being delimited at its distal end by an atraumatic tip (6), said atraumatic tip being configured to occlude said outer sheath, and having means for securing the position of an endoprosthesis relative to the mandrel, the atraumatic tip (6) comprising an axial hole (12) for passage of a guide wire, wherein the atraumatic tip (6) is made of an elastomer material and comprises a thin-walled inflatable chamber (10) which is configured to be inflated by a pressure of less than 1 bar to form an expanded shape, wherein a proximal end of the atraumatic tip is configured to be distal from a distal end of the endoprosthesis; and wherein a lumen (9, 9A, 9B) extends from a distal end to a proximal end of the mandrel (4) for passage of an inflation fluid and leads into the inflatable chamber (10), wherein the atraumatic tip (6) comprises a proximal portion and said inflatable chamber, said proximal portion fitting an end of said sheath, said atraumatic tip being movable axially relative to the sheath between a first position in which the proximal portion is located in the sheath, and a second position in which the proximal portion is located outside the sheath,
the method comprising the steps of:
introducing the device into the channel (20) as far as the zone to be treated;introducing a defined volume of inflation liquid into the inflatable chamber (10) of the atraumatic tip (6) in such a way as to form a balloon which immobilizes the tip of the device relative to the channel; wherein the inflation liquid is introduced into the inflatable chamber while the atraumatic tip is in the first position,freeing the endoprosthesis by pulling back the outer sheath (1); anddeflating the balloon and withdrawing the device. |
