This disclosure generally relates to endovascular devices, and more particularly, to endovascular occlusion devices used in the treatment of an aneurysm.
Endovascular coiling is often utilized in the treatment of an aneurysm. A microcatheter may be introduced into a patient's vasculature, the tip of the microcatheter further advanced to the site of the aneurysm, for example. Once positioned, one or more vascular occluding or vaso-occlusive coils may then be advanced through the microcatheter and into a void of the aneurysm. Once positioned within the void, the body responds by forming a clot around the coils, reducing the associated blood pressure and risk of rupture of the aneurysm.
During such procedures, one or more of the advancing vaso-occlusive coil structures may exit the aneurysm void, entering the patient's vasculature. The coil must then be retracted and advanced once more, ensuring that the coil remains within the aneurysm. Such additional steps unnecessarily prolong the endovascular procedure, resulting in increased risk to the patient. Additionally, after such procedures, at least a portion of the one or more vaso-occlusive coil structures may exit the void of the aneurysm and enter the patient's vasculature, reducing blood flow in the area.
Accordingly, there is a need for a vascular occluding coil that encourages deployment within the void of an aneurysm.
Consistent with the present disclosure, a vaso-occlusive coil may have a primary shape when confined within a lumen of a deployment device, and a secondary shape when unconfined, and may include one or more of the following features. The primary shape may be generally straight or curvilinear, e.g., following a shape of a lumen as part of the deployment device, while the secondary shape may include a plurality of geometric shapes. The plurality of geometric shapes may cooperate to form a central void. One or more of the plurality of geometric shapes may have a geometric plane generally along its longitudinal axis, the geometric plane of the one or more of the plurality of geometric shapes may be configured to pass through a portion of the central void. The geometric shape of the one or more of the plurality of geometric shapes may pass through a portion of the central void.
Certain embodiments may include one or more of the following features. The vaso-occlusive coil may be configured to transition from the primary shape to the secondary shape as the vaso-occlusive coil is deployed from a distal opening of the lumen of the deployment device. Each of the plurality of geometric shapes may be selected from a group of shapes including a circular shape, a rectangular shape, and a triangular shape. Each of the plurality of geometric shapes may have a length, the length of a first of the plurality of geometric shapes may be less than a length of each of the remaining ones of the plurality of geometric shapes. A length of a second of the plurality of geometric shapes may be greater than the first of the plurality of geometric shapes, but less than a length of each of the remaining ones of the plurality of geometric shapes.
Certain embodiments may include one or more of the following features. A length of the coil may extend along the plurality of geometric shapes and a first of the plurality of geometric shapes may be a distal-most geometric shape along the length of the coil. The first of the plurality of geometric shapes may be adjacent to a second of the plurality of geometric shapes along the length of the coil. The second of the plurality of geometric shapes may include a geometric plane generally along its longitudinal axis, and the geometric plane of the second of the plurality of geometric shapes may be configured to pass through the central void. A length of the second of the plurality of geometric shapes may be less than a length of each of the remaining ones of the plurality of geometric shapes. A length of the second of the plurality of geometric shapes may be greater than a length of the first of the plurality of geometric shapes. Each of the plurality of geometric shapes may include a respective one of a plurality of geometric planes, generally along its corresponding longitudinal axis, the geometric plane of the first of the plurality of geometric planes being nonparallel to the remaining ones of the plurality of geometric planes. The geometric plane of the first of the plurality of geometric planes may be non-perpendicular to remaining ones of the plurality of geometric planes. Each of the geometric planes of the first and second of the plurality of geometric planes may be nonparallel to the remaining ones of the plurality of geometric planes. Each of the geometric planes of the first and second of the plurality of geometric planes may be non-perpendicular to the remaining ones of the plurality of geometric planes. A portion of the first of the plurality of geometric shapes may pass through the geometric plane of a second of the plurality of geometric shapes, the second of the plurality of geometric shapes being adjacent to the first of the plurality of geometric shapes.
In another aspect, a method may include providing an vaso-occlusive coil having a primary shape and a secondary shape, the secondary shape including a plurality of geometric shapes. A first of the plurality of geometric shapes may have a geometric plane generally along its longitudinal axis. Remaining ones of the plurality of geometric shapes may cooperate to form a central void, and the geometric plane of the first of the plurality of geometric shapes may pass into the central void. The method may include advancing a deployment device to a target tissue site, the deployment device having a lumen there through, and may include advancing the vaso-occlusive coil through the lumen of the deployment device until the vaso-occlusive coil transitions from the primary shape to the secondary shape.
Reference will be made to embodiments of the disclosure, examples of which may be illustrated in the accompanying figures. These figures are intended to be illustrative, not limiting. Although certain aspects of the embodiments are generally described, it should be understood that such description is not intended to limit the scope to these particular embodiments. In the drawings:
Vaso-occlusive coils, and methods of their use, are disclosed having configurations suitable for treating certain problems associated with the vasculature, such as aneurysms, for example. The vaso-occlusive coils described or contemplated herein are configured to improve adherence to aneurysms resulting in diversion of blood flow around the aneurysm while promoting healing of the vasculature.
The following description is set forth for explanation to provide an understanding of the various embodiments of the present disclosure. However, as should be apparent, one skilled in the art will recognize that embodiments of the present disclosure may be incorporated into numerous other embodiments, devices and systems.
The embodiments of the present disclosure may include certain aspects each of which may be present in one or more medical devices or systems thereof. Assemblies and devices shown below are not necessarily to scale and are illustrative of exemplary embodiments. Furthermore, the illustrated exemplary embodiments disclosed herein may include more, or less, structures than depicted, and are not intended to be limited to the specific depicted structures. While various portions of the present disclosure are described relative to specific structures or processes with respect to a medical device or system using specific labels, these labels are not meant to be limiting.
The vaso-occlusive coils described herein may be made from any suitable biocompatible material, such as wire, including but not limited to metals (e.g., platinum), metal alloys (e.g. stainless steel, Nitinol) and/or polymers (e.g. polycarbonate), and may be formed using any appropriate process. For example, the vaso-occlusive coils described herein may be formed using wire wrapped around one or more mandrels of various sizes and/or further subjecting the wire to heat in order to obtain a desired shape, as is known in the art. The wire may have any desired cross-section, including but not limited to, circular, rectangular, or triangular. For illustrative purposes only, any of the embodiments described or contemplated herein may utilize wire having a cross-sectional dimension in the range of about 0.00002 to about 0.01 inches, and associated coil loops formed by the wire may have a cross-sectional dimension between about 0.003 to about 0.03 inches, and preferably from about 0.009 inches to about 9.915 inches. Furthermore, for illustration purposes only, the vaso-occlusive coils described or contemplated herein may have an axial length in the range of about 0.2 inches to about 40 inches, and may have from 20 to 150 turns per inch.
Reference will now be made in detail to the present exemplary embodiments, which are illustrated in the accompanying drawings.
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Additionally, a geometric plane generally defined by the geometric shape 110A may be configured to pass within the central void 112. We have discovered that such a configuration of the distal-most geometric shape, e.g., geometric shape 110A, reduces the likelihood of the coil entering back into the vasculature during deployment, while encouraging continued deployment into a biological space or area, such as a space within an aneurysm. Furthermore, a geometric plane generally define by the geometric shape 110B may be configured to pass within the central void 112, as well. We have discovered that such a configuration of the geometric shape 110B, along with the tilted configuration of the geometric shape 110A, may cooperate to further encourage continued coil 100 deployment with the biological space.
Each of the plurality of geometric shapes 110 includes a dimension, a length if the geometric shape is more rectangular or a diameter if the geometric shape is more circular, for example, and one or more of dimensions of the plurality of geometric shapes 110 may be less than the remaining dimensions thereof to further encourage deployment into the confined area. For example, each of the plurality of geometric shapes 110 may be circular having a respective one of a plurality of diameters, and the diameter of the distal-most geometric shape 110A may be less than the diameters of the remaining ones of the plurality of diameters corresponding to the geometric shapes 110C-110F. Additionally, the diameter of the geometric shape 110B may be greater than the diameter of geometric shape 110A, but less than the remaining ones of the plurality of diameters corresponding to the geometric shapes 110C-110F. We have discovered that this configuration of the geometric shapes 110 may encourage the vaso-occlusive coil deployment to remain within the biological space of an aneurysm.
Additionally, each of the geometric shapes 110 of
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As noted previously, the forgoing descriptions of the specific embodiments are presented for purposes of illustration and description, and are not intended to be exhaustive or to be limited to the precise forms disclosed, as many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described to illustrate and explain principles and practical applications, to thereby enable those skilled in the art to best utilize the various embodiments thereof as suited to the particular use contemplated.