Loading apparatus and system for expandable intraluminal medical devices
Medical device loading apparatuses, systems, methods and kits are described. A loading apparatus comprises a main body having a passageway. The passageway has a first inner diameter, a second inner diameter, and a transition chamber. An expandable intraluminal medical device can be loaded into a delivery catheter using the loading apparatus by placing the device into the passageway and pushing the device along an axial path.
1 . A loading apparatus comprising:
a main body having a first opening, a second opening, and a passageway extending between the first and second openings, the passageway defining a first chamber, a second chamber, and a transition chamber disposed between the first and second chambers and defining a taper; and
a pusher having central axis, a base, and between two and five pushing arms, each pushing arm comprising an elongate member having a first end disposed within the passageway defined by the main body and a second end attached to the base, the first end of each pushing arm disposed a first distance from the central axis when free of the main body and external forces, the second end of each pushing arm disposed a second distance from the central axis when free of the main body, the second distance greater than the first distance such that the entire second end is disposed further from the central axis than the first end.
2 . The loading apparatus of claim 1 , wherein the pushing arms are disposed equidistant from each other relative to the central axis.
3 . The loading apparatus of claim 1 , wherein each pushing arm has a first thickness at the first end and a second thickness at the second end that is greater than the first thickness.
4 . The loading apparatus of claim 1 , wherein the second chamber defines a taper.
5 . The loading apparatus of claim 1 , wherein the second chamber has a uniform inner diameter.
6 . The loading apparatus of claim 1 , wherein the transition chamber has a length and transition inner diameter that varies over the length of the transition chamber.
7 . The loading apparatus of claim 1 , wherein the first chamber has a first inner diameter; and
wherein the second chamber has a second inner diameter that is greater than the first inner diameter.
8 . The loading apparatus of claim 7 , wherein the base of the pusher has a width that extends through the central axis and is greater than the first inner diameter.
9 . The loading apparatus of claim 7 , wherein the first distance is less than the second inner diameter.
10 . The loading apparatus of claim 1 , further comprising a cap disposed on the main body, the cap defining a cap passageway in communication with the passageway of the main body.
11 . The loading apparatus of claim 1 , wherein the main body is formed of plastic.
12 . A medical device loading system comprising:
a loading apparatus comprising a main body having a first opening, a second opening, and a passageway extending between the first and second openings, the passageway defining a first chamber, a second chamber, and a transition chamber disposed between the first and second chambers and defining a taper;
a delivery catheter comprising an outer tubular member defining a sheath lumen and a distal tip member comprising an elongate cannula and a distal tip body, the distal tip body adapted to pass through the loading apparatus; and
a pusher having central axis, a base, and between two and five pushing arms, each pushing arm comprising an elongate member having a first end configured to be inserted into the second opening and a second end attached to the base, the first end of each pushing arm disposed a first distance from the central axis when free of the loading apparatus and external forces, the second end of each pushing arm disposed a second distance from the central axis when free of the loading apparatus, the second distance greater than the first distance such that the entire second end is disposed further from the central axis than the first end.
13 . The medical device loading system of claim 12 , wherein the pushing arms are disposed equidistant from each other relative to the central axis.
14 . The medical device loading system of claim 12 , wherein the second chamber defines a taper.
15 . The medical device loading system of claim 12 , wherein the transition chamber has a length and transition inner diameter that varies over the length of the transition chamber.
16 . The medical device loading system of claim 12 , wherein the first chamber has a first inner diameter; and
wherein the second chamber has a second inner diameter that is greater than the first inner diameter.
17 . The medical device loading system of claim 12 , further comprising a cap disposed on the main body, the cap defining a cap passageway in communication with the passageway of the main body.
18 . A method of loading an expandable intraluminal medical device into a delivery catheter, said method comprising:
placing said expandable intraluminal medical device into a passageway defined by a loading apparatus such that said expandable intraluminal medical device is disposed within the passageway, the loading apparatus having a lengthwise axis and comprising a main body having a first opening, a second opening, and the passageway, the passageway extending between the first and second openings, the passageway defining a first chamber, a second chamber, and a transition chamber disposed between the first and second chambers and defining a taper;
advancing a distal portion of a medical device delivery catheter into the first chamber of the loading apparatus, the medical device delivery catheter comprising an outer tubular member defining a sheath lumen and a distal tip member comprising an elongate cannula and a distal tip body, the distal tip body adapted to pass through the loading apparatus;
pushing said expandable intraluminal medical device along the lengthwise axis of the loading apparatus and toward the outer tubular member using pushing arms of a pusher, the pusher having central axis, a base, and between two and five pushing arms, each pushing arm comprising an elongate member having a first end disposed within the passageway defined by the loading apparatus and a second end attached to the base, the first end of each pushing arm disposed a first distance from the central axis when free of the loading apparatus and external forces, the second end of each pushing arm disposed a second distance from the central axis when free of the loading apparatus, the second distance greater than the first distance such that the entire second end is disposed further from the central axis than the first end; and
removing the delivery catheter from the loading apparatus.
19 . The method of claim 18 , wherein the pushing arms are disposed equidistant from each other relative to the central axis.
20 . The method of claim 18 , wherein the transition chamber has a length and transition inner diameter that varies over the length of the transition chamber.