Loading devices and methods for percutaneous perforation closure systems
A device for folding an implant having a wing into a an overlapped configuration includes a funnel body comprising: a first portion configured to receive and protect the implant when the wing of the implant is in a flat or relaxed state, a second portion proximal to the first portion and configured to engage and fold opposite first and second side portions of the wing of the implant in a predetermined direction when the implant is retracted proximally from the first portion of the funnel body and into the second portion of the funnel body, and an overlap guide configured to direct the path of a first one of the side portions of the wing such that the first and second side portions of the wing are overlapped in a predetermined manner and to prevent respective edges of the first and second side portions of the wing from butting into each other as the first and second side portions of the wing are guided into the overlapping configuration during proximal retraction of the implant relative to the funnel body.
1. A device for folding an implant having a wing into an overlapped configuration, the device comprising:
a funnel body having a substantially smooth inner funnel surface, comprising
a first portion to receive and protect the implant when the wing of the implant is in a relaxed state,
a second portion proximal to the first portion to engage and fold opposite first and second side portions of the wing of the implant in a predetermined direction when the implant is retracted proximally from the first portion of the funnel body and into the second portion of the funnel body, and
a third portion comprising an overlap guide comprising a groove in the inner funnel surface in direction of a longitudinal axis of the third portion to direct the path of a first one of the side portions of the wing such that the first and second side portions of the wing are overlapped in a predetermined manner and to prevent respective edges of the first and second side portions of the wing from butting into each other as the first and second side portions of the wing are guided into the overlapping configuration during proximal retraction of the implant relative to the funnel body,
wherein the groove is disposed such that the groove causes a cross-section of the third portion having the groove, perpendicular to the longitudinal axis, to be non-symmetric.
2. The device according to claim 1 , wherein the funnel body comprises four distinct zones including
a first zone corresponding to the first portion of the funnel body,
a second zone corresponding to the second portion of the funnel body,
a third zone corresponding to the overlap guide of the funnel body, and
a fourth zone corresponding to the location of a loading cannula that is separable from the funnel body.
3. The device according to claim 1 , further comprising a loading cannula separable from the funnel body and configured to receive the implant from the funnel body after the implant has been converted to its overlapped configuration via proximal movement of the implant through the funnel body.
4. The device according to claim 3 , wherein, at an interface between the funnel body and loading cannula, an internal diameter of the funnel body is less than the internal diameter of the loading cannula such that the implant does not catch on a proximal edge of the loading cannula as the implant is moved proximally into the loading cannula.
5. The device according to claim 1 , wherein the second portion includes sloped surfaces configured to engage the side portions of the wing in a manner that forces the side portions to be folded in a predetermined direction.
6. A method of loading an implant having a flexible wing into a loading cannula, the method comprising:
retracting the implant proximally through the device according to claim 1 until the implant is disposed in the loading cannula; and
separating the loading cannula from the funnel body.