Stent and method of inserting a stent into a delivery catheter

Abstract

A stent 2 and method of inserting a stent 2 into a delivery catheter are disclosed. In a disclosed embodiment, a stent 2 for redirecting blood flow away from an aneurysmal sac is provided. The stent comprises an elongate frame that is radially contractable from a fully radially expanded state (Figure 2) to a radially contracted state (Figure 3) in a process involving elongation of the frame. The fully radially expanded state represents the state of the frame at body temperature when no external force is applied to the frame. In the radially contracted state the frame has a maximum lateral dimension that is at least 30% smaller than the maximum lateral dimension of the frame in the fully radially expanded state. The frame further comprises a low porosity region 4 for positioning at the opening to the aneurysmal sac, the low porosity region having a porosity of less than 50% when the frame is in the fully radially expanded state.

Description

technical field

[0001] The present invention relates to the field of stents for the treatment of aneurysms, such as intracranial aneurysms (also known as cerebral aneurysms). Background technique

[0002] An intracranial aneurysm is a weak area in the wall of an artery in the brain where dilation or bulging of the artery wall may occur. Histologically, narrowing of the arterial media, muscularis intermediary, and internal elastic lamina causes structural defects. These defects combined with hemodynamic factors lead to out-punching of the aneurysm. Intracranial aneurysms are very common, affecting one to five percent of adults, according to autopsy studies. In the United States alone, perhaps 10 to 12 million people have intracranial aneurysms.

[0003] Current methods used to treat intracranial aneurysms include surgical clipping and endovascular coiling. In the surgical clipping method, the patient's skull is opened and surgical clips are placed across the neck of the a...

Examples

Embodiment Construction

[0031]In the following description, any reference to a deformable element should be understood to include both forward deformation (eg stretching, stretching) and reverse deformation (eg contraction). Typically, the scaffold will be formed from a material that is elastic at room temperature and / or body temperature. Typically, the stent will be configured such that the stent frame is resilient to all deformations during normal use at room temperature and / or body temperature. However, this is not required. The stent frame may be configured to allow some degree of plastic deformation at room temperature and / or body temperature.

[0032] figure 1 and figure 2 is a schematic side view of an example stent in a radially fully expanded state. The support comprises an elongated frame 2 . Frame 2 can be cylindrical, for example. When the frame 2 is cylindrical, its maximum transverse dimension is the same (ie equal to the diameter) at all positions and angles. When the frame 2 i...

technical field

[0001] The present invention relates to the field of stents for the treatment of aneurysms, such as intracranial aneurysms (also known as cerebral aneurysms). Background technique

[0002] An intracranial aneurysm is a weak area in the wall of an artery in the brain where dilation or bulging of the artery wall may occur. Histologically, narrowing of the arterial media, muscularis intermediary, and internal elastic lamina causes structural defects. These defects combined with hemodynamic factors lead to out-punching of the aneurysm. Intracranial aneurysms are very common, affecting one to five percent of adults, according to autopsy studies. In the United States alone, perhaps 10 to 12 million people have intracranial aneurysms.

[0003] Current methods used to treat intracranial aneurysms include surgical clipping and endovascular coiling. In the surgical clipping method, the patient's skull is opened and surgical clips are placed across the neck of the a...

Examples

Embodiment Construction

[0031]In the following description, any reference to a deformable element should be understood to include both forward deformation (eg stretching, stretching) and reverse deformation (eg contraction). Typically, the scaffold will be formed from a material that is elastic at room temperature and / or body temperature. Typically, the stent will be configured such that the stent frame is resilient to all deformations during normal use at room temperature and / or body temperature. However, this is not required. The stent frame may be configured to allow some degree of plastic deformation at room temperature and / or body temperature.

[0032] figure 1 and figure 2 is a schematic side view of an example stent in a radially fully expanded state. The support comprises an elongated frame 2 . Frame 2 can be cylindrical, for example. When the frame 2 is cylindrical, its maximum transverse dimension is the same (ie equal to the diameter) at all positions and angles. When the frame 2 i...

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