Implantable embolization device
In some examples, an embolization device includes multiple sections with three-dimensional non-helical structures when deployed at a vascular site. The multiple sections include a first section and one or more second sections that are smaller than the first section. The first section may have a deployed structure configured to anchor the device at a vascular site (e.g., a blood vessel) of a patient while each of the one or more second sections may be formed from loops that configured to pack and obstruct the vascular site. In some cases, the embolization device also includes a third section having a deployed configuration with multiple helical windings or loops is configured to anchor the embolization device at the vascular site.
1. A medical device comprising:
a device body comprising:
a first section;
at least one second section; and
a third section connected to the first section on an opposite side of the first section from the at least one second section,
wherein the device body defines a longitudinal axis extending in a direction from the third section to the at least one second section, and
wherein, in a deployed configuration of the device body:
the first section defines a plurality of first section loops forming a three-dimensional non-helical structure configured to engage a vessel wall of a blood vessel of a patient to help anchor the device body in the blood vessel,
the at least one second section defines a plurality of second section loops forming a three-dimensional non-helical structure,
the at least one second section has a maximum cross-sectional dimension that is smaller than a maximum cross-sectional dimension of the first section,
the third section forms a different sized and shaped structure than the three-dimensional non-helical structure formed by the first section,
the third section defines a plurality of third section loops configured to engage the vessel wall to help anchor the device body in the blood vessel, and
all of the third section loops defined by the third section wind around the longitudinal axis, and
wherein at least one loop of the plurality of third section loops forms a distalmost end of the device body.
2. The medical device of claim 1 , wherein the third section defines at least one third section loop of the plurality of third section loops larger than at least one first section loop of the plurality of first section loops.
3. The medical device of claim 1 , wherein the three-dimensional non-helical structure of one or more of the first section or the at least one second section is an approximately polyhedral structure having three or more sides.
4. The medical device of claim 3 , wherein the approximately polyhedral structure is approximately cubic, approximately tetrahedral, or approximately octahedral.
5. The medical device of claim 3 , wherein the approximately polyhedral structure having three or more sides is defined by at least six loops.
6. The medical device of claim 1 , wherein the at least one second section includes at least two second sections.
7. The medical device of claim 1 , wherein the maximum cross-sectional dimension of the first section is from about 10% to about 50% larger than the maximum cross-sectional dimension of the at least one second section.
8. The medical device of claim 1 , wherein the maximum cross-sectional dimension of the first section is from about 10% to about 100% larger than the maximum cross-sectional dimension of the at least one second section.
9. The medical device of claim 1 , wherein in the deployed configuration, the plurality of third section loops of the third section forms a helical structure.
10. The medical device of claim 9 , wherein the helical structure has a tapered configuration.
11. The medical device of claim 1 , wherein the device body comprises a coil comprising a plurality of windings.
12. The medical device of claim 1 , wherein the third section is formed from a material having a chemical composition different from a chemical composition of a material from which at least one of the first section or the at least one second section are formed.
13. The medical device of claim 1 , wherein the three-dimensional non-helical structure of the first section defines scaffolding, and wherein the at least one second section is configured to pack the scaffolding to at least partially obstruct the blood vessel.
14. A medical device comprising:
a device body comprising:
a first section;
at least one second section; and
a third section connected to the first section on an opposite side of the first section from the at least one second section,
wherein the device body defines a longitudinal axis extending in a direction from the third section to the at least one second section, and
wherein, in a deployed configuration of the device body:
the first section defines a plurality of first section loops forming a three-dimensional non-helical structure configured to engage a vessel wall of a blood vessel of a patient to help anchor the device body in the blood vessel,
the at least one second section has a maximum cross-sectional dimension that is smaller than a maximum cross-sectional dimension of the first section,
the third section forms a different sized and shaped structure than the three-dimensional non-helical structure formed by the first section,
the third section defines a plurality of third section loops configured to engage the vessel wall to help anchor the device body in the blood vessel,
wherein the third section defines at least one third section loop of the plurality of third section loops larger than at least one first section loop of the plurality of first section loops, and
all of the third section loops defined by the third section wind around the longitudinal axis, and
wherein the third section defines a helical structure.
15. The medical device of claim 14 , wherein the maximum cross-sectional dimension of the first section is from about 10% to about 100% larger than the maximum cross-sectional dimension of the at least one second section.
16. A medical device comprising:
a device body comprising a first section, one or more second sections connected to one end of the first section, and a third section directly connected to the other end of the first section distal to the first section, wherein the device body defines a longitudinal axis extending in a direction from the third section to the one or more second sections, wherein, in a first configuration of the device body, the device body has a longitudinally extending configuration, and wherein, in a second, deployed configuration of the device body:
the first section defines a plurality of first section loops forming a three-dimensional non-helical structure configured to engage a vessel wall in vasculature of a patient to help anchor the device body in the vasculature,
each second section of the one or more second sections defines a plurality of second section loops forming a three-dimensional non-helical structure,
each second section of the one or more second sections has a maximum cross-sectional dimension that is smaller than a maximum cross-sectional dimension of the first section,
the third section forms a different sized and shaped structure than the three-dimensional non-helical structure formed by the first section,
the third section defines a plurality of third section loops configured to engage the vessel wall to help anchor the device body in the vasculature of the patient,
at least one loop of the plurality of third section loops forms a distalmost end of the device body, and
at least two directly adjacent third section loops defined by the third section wrap around the longitudinal axis.
17. The medical device of claim 16 , wherein the third section defines at least one third section loop of the plurality of third section loops larger than at least one first section loop of the plurality of first section loops.
18. The medical device of claim 1 , wherein the third section loops that wind around the longitudinal axis are directly adjacent to each other.
19. The medical device of claim 1 , wherein all of the third section loops defined by the third section are formed from a single and continuous length of a material.
20. The medical device of claim 16 , wherein, in the second, deployed configuration of the device body, all third section loops defined by the third section wrap around the longitudinal axis.
21. A medical device comprising:
a device body comprising:
a first section;
at least one second section; and
a third section connected to the first section on an opposite side of the first section from the at least one second section,
wherein the device body defines a longitudinal axis extending in a direction from the third section to the at least one second section, and
wherein, in a deployed configuration of the device body:
the first section defines a plurality of first section loops forming a three-dimensional non-helical structure configured to engage a vessel wall of a blood vessel of a patient to help anchor the device body in the blood vessel,
the at least one second section defines a plurality of second section loops forming a three-dimensional non-helical structure, the three-dimensional non-helical structure of one or more of the first section or the at least one second section being an approximately polyhedral structure having three or more sides, the approximately polyhedral structure having three or more sides being defined by at least six loops,
the at least one second section has a maximum cross-sectional dimension that is smaller than a maximum cross-sectional dimension of the first section,
the third section forms a different sized and shaped structure than the three-dimensional non-helical structure formed by the first section, and
the third section defines a plurality of third section loops configured to engage the vessel wall to help anchor the device body in the blood vessel.