초록 ▼

A diffusion barrier for an implantable device, such as a stent, carrying a therapeutic or bioactive substance is disclosed. The diffusion barrier reduces the rate at which the therapeutic or bioactive substance is released from the device. The diffusion barrier can be made from a polymeric material

A diffusion barrier for an implantable device, such as a stent, carrying a therapeutic or bioactive substance is disclosed. The diffusion barrier reduces the rate at which the therapeutic or bioactive substance is released from the device. The diffusion barrier can be made from a polymeric material impregnated with particles.

대표청구항 ▼

A diffusion barrier for an implantable device, such as a stent, carrying a therapeutic or bioactive substance is disclosed. The diffusion barrier reduces the rate at which the therapeutic or bioactive substance is released from the device. The diffusion barrier can be made from a polymeric material

A diffusion barrier for an implantable device, such as a stent, carrying a therapeutic or bioactive substance is disclosed. The diffusion barrier reduces the rate at which the therapeutic or bioactive substance is released from the device. The diffusion barrier can be made from a polymeric material impregnated with particles. ing. 19. The bone screw of claim 14, wherein said bone screw comprises a quick disconnect head. 20. The bone screw of claim 19 wherein said bone screw further comprises a spacer located proximal to said threaded distal tip and adapted to prevent penetration of a patient's skull. tion with the first storage chamber to a second position for ejecting the first part of the two-part fastener. 19. The end effector of claim 14, wherein the first end effector defines an ejection port through which the first part of the two-part fastener is ejected by the firing mechanism. 20. The end effector of claim 15, wherein the second holding device includes a shuttle device for moving one of the plurality second parts of the two-part fastener from the second storage chamber into position to engage with the first part of the two-part fastener. 21. The end effector of claim 20, wherein the shuttle device comprises a slidable tray. 22. The end effector of claim 1, wherein the first end effector member defines an exit port for an endoscope. 23. The end effector of claim 1, wherein the first end effector member comprises a relatively flexible proximal portion and a relatively rigid distal portion.