Site marker visable under multiple modalities

1. A site marker, comprising:

a generally hollow body portion that defines a cavity of open space therein; and

at least one solid marker element captured within said cavity, thereby preventing migration of said marker element within a body, but permitting said marker element to move within said cavity;

wherein said body portion of said site marker is compressed into a predeployment configuration and wherein said body portion of said site marker is configured to expand from said predeployment configuration to a deployed configuration.

2. The site marker of claim 1 , wherein said hollow body portion is flanked by closed ends.

3. The site marker of claim 1 , wherein said hollow body portion is constructed of a bioabsorbable material.

4. The site marker of claim 3 , wherein said bioabsorbable material is one of polyglycolic acid, polylactic acid, hydrogel, and collagen-based material.

5. The site marker of claim 3 , wherein said bioabsorbable material is woven into a flexible mesh material having openings therein, wherein said openings are smaller in size than the size of said marker element such that said marker element cannot escape said cavity.

6. The site marker of claim 3 , wherein said body portion is absorbed by a body after a predetermined time period.

7. The site marker of claim 6 , wherein said predetermined time period is in the range of about three weeks to six months.

8. The site marker of claim 6 , wherein said marker element is permanent such that said marker remains within the body after said body portion is absorbed.

9. The site marker of claim 8 , wherein said marker element is visible under multiple modalities.

10. The site marker of claim 1 , wherein said body portion further includes one or more barbs disposed thereon for adhering said site marker within the body.

11. The site marker of claim 10 , wherein said barbs extend at a non-perpendicular angle relative to an outside surface of said body portion.

12. The site marker of claim 11 , wherein said body portion includes a plurality of barbs and said barbs extend from said outside surface of said body portion at various angles.

13. The site marker of claim 1 , wherein said body portion of said site marker automatically expands from said predeployment configuration to said deployed configuration upon insertion into the body.

14. The site marker of claim 13 , wherein said body portion expands from said predeployment configuration to said deployed configuration upon application of heat to said body portion.

15. The site marker of claim 13 , wherein at least a portion of said body portion of said deployed configuration is equal to or larger than an outlet of a deployment device such that said site marker cannot re-enter said deployment device after said site marker exits therefrom.

16. The site marker of claim 1 , wherein said body portion of said site marker is selectively and manually expanded from said predeployment configuration to said deployed configuration.

17. A site marker, comprising:

a generally hollow body portion that defines a cavity therein; and

at least one marker element captured within said cavity, thereby preventing migration of said marker element within a body, but permitting said marker element to move within said cavity;

wherein said site marker further includes a deployment line having a first end fixedly secured to a first end of said body portion, wherein said line extends outwardly from a second end of said body portion, said first end of said deployment line is configured to pull said first end of said body portion toward said second end of said body portion to expand said body portion from a predeployment configuration into a deployed configuration.

18. The site marker of claim 17 , further including a tie-wrap connected to said line to retain said body portion in said deployed configuration.

19. A site marker, comprising:

a generally hollow body portion that defines a cavity therein; and

at least one marker element captured within said cavity, thereby preventing migration of said marker element within a body, but permitting said marker element to move within said cavity;

wherein said body portion further includes a plurality of external pre-biased spines, wherein said spines are configured to automatically expand said body portion from a predeployment configuration to a deployed configuration.

20. The site marker of claim 19 , wherein said external spines are connected together by a woven web material.

21. The site marker of claim 19 , wherein said body portion is constructed of a bioabsorbable material.

22. The site marker of claim 19 , wherein said body portion forms a tetrahedron shell.

23. The site marker of claim 19 , wherein said body portion forms a double tetrahedron shell.

24. The site marker of claim 19 , wherein said marker element is constructed of a permanent material that is not absorbable by the body.

25. A site marker, comprising:

a generally hollow body portion that defines a cavity therein; and

at least one marker element captured within said cavity, thereby preventing migration of said marker element within a body, but permitting said marker element to move within said cavity;

wherein said body portion contains a tube element having internal spines positioned therein, wherein said spines are configured to automatically expand said body portion from a predeployment configuration to a deployed configuration.

26. The site marker of claim 25 , wherein said internal spines of said tube element are pre-biased so as to automatically expand said body portion from said predeployment configuration to said deployed configuration.

27. The site marker of claim 26 , wherein spines are positioned adjacent end portions of said tube element to close either end of said tube element.

28. The site marker of claim 27 , wherein said spines form capped ends when said site marker is in said deployed configuration.

29. The site marker of claim 26 , wherein said marker is a permanent marker that is not bioabsorbable.

30. The site marker of claim 26 , wherein said body portion is bioabsorbable after a predetermined time period within the body.