Conical vena cava filter with jugular or femoral retrieval
View Patent ↗A removable intravascular filter having a filtering configuration for capturing thrombi in a blood vessel and a retrieval configuration for removal from the blood vessel. The filter may be implanted in a patient's vena cava and may be removed from the vena cava through the patient's jugular or femoral vein. A method of removing an intravascular filter from a patient's vena cava through the patient's femoral vein is also provided.
1. An intravascular filter having a filtering configuration for capturing thrombi in a blood vessel and a retrieval configuration, the filter comprising:
a plurality of struts having first and second ends, the first ends of the struts being attached together along a longitudinal axis, the second ends of the struts being attached together along the longitudinal axis, each strut having a first portion, a second portion, and a third portion, the third portion of each strut being substantially linear and having a bending region, wherein the bending region is substantially straight in the filtering configuration, the first portion extending laterally away from the longitudinal axis and generally upstream from the first end when the filter is in the filtering configuration, the second portion extending generally upstream from the first portion when the filter is in the filtering configuration, the third portion extending inwardly toward the longitudinal axis, generally downstream, and substantially linearly from the second portion to the second end when the filter is in the filtering configuration, the second portion being shorter than the first portion and the third portion, each strut extending generally upstream from the first end to the second end when the filter is in the retrieval configuration;
a first coupling element disposed with the first ends of the struts for jugular vein retrieval; and
a second coupling element disposed with the second ends of the struts for femoral vein retrieval, wherein the bending region bends when tension is applied to the second coupling element; and
wherein the second and third portions of each strut define a first angular joint between the second and third portion, and the third portion includes a second angular joint directly adjacent to the second end of the strut when the filter is in the filtering configuration.
2. The intravascular filter of claim 1 , wherein the second portions of the struts extend substantially in parallel to the longitudinal axis of the filter to engage the blood vessel when the filter is in the filtering configuration.
3. The intravascular filter of claim 1 , wherein the third portion of each strut has a plurality of bending regions.
4. The intravascular filter of claim 1 , wherein the bending region comprises a narrowed portion of the strut.
5. The intravascular filter of claim 1 , wherein the bending region comprises a mechanical hinge.
6. The intravascular filter of claim 1 , wherein the bending region is configured to bend away from the longitudinal axis when the filter is in the filtering configuration and tension is applied to the second coupling element.
7. The intravascular filter of claim 1 , wherein the bending region is configured to bend toward the longitudinal axis when the filter is in the filtering configuration and tension is applied to the second coupling element.
8. The intravascular filter of claim 1 , wherein the struts and the first and second coupling elements are constructed from a laser cut cannula.
9. The intravascular filter of claim 8 , wherein the first and second coupling elements each comprise a diagonal notch in the cannula.
10. The intravascular filter of claim 1 , wherein the struts are constructed from stainless steel wire.
11. The intravascular filter of claim 10 , further comprising a first hub housing the first ends of the struts and a second hub housing the second ends of the struts.
12. The intravascular filter of claim 11 , wherein the first coupling element comprises a jugular retrieval hook extending downstream from the first hub, and the second coupling element comprises a femoral retrieval hook extending upstream from the second hub.
13. The intravascular filter of claim 1 , further comprising at least one anchoring hook disposed with one or more of the struts, the at least one anchoring hook extending away from the longitudinal axis to engage the blood vessel.
14. The intravascular filter of claim 13 , wherein the at least one anchoring hook comprises at least two anchoring hooks, at least one of the at least two anchoring hooks extending downstream to prevent migration of the filter in the blood vessel, at least one of the at least two anchoring hooks extending upstream to prevent migration of the filter when tension is applied to the second coupling element.