Magnetic shield for medical devices
A medical device such as a needle subassembly is disclosed including a cover over a magnetized portion of a tissue-penetrating medical device having a shielding material associated with the cover that prevents the magnetized portion of the tissue-penetrating medical device from being de-magnetized when the cover is positioned to cover the tissue-penetrating medical device.
1. A needle subassembly comprising:
a needle including a shaft having a magnetized portion; and
a magnetic shield comprising a removable cover sized to provide a protective closure over the magnetized portion of the shaft and a shielding material that prevents the magnetized portion of the shaft from being de-magnetized when the cover is positioned to cover the shaft;
wherein the removable cover is removed prior to insertion;
wherein the magnetic shield includes a highly conductive material and a ferromagnetic metal coating.
2. The needle subassembly of claim 1 , wherein the shielding material has a high magnetic permeability.
3. The needle subassembly of claim 1 , wherein the highly conductive material comprises copper.
4. The needle subassembly of claim 1 , wherein the cover is selected from a needle cover, catheter packaging or a shipping container.
5. The needle subassembly of claim 1 , wherein the shielding material is spray-coated onto an interior surface of the cover.
6. The needle subassembly of claim 1 , wherein the shielding material is spray-coated onto an exterior surface of the cover.
7. The needle subassembly of claim 1 , wherein the shielding material is spray-coated onto an interior surface and exterior surface of the cover.
8. The needle subassembly of claim 1 , wherein the shielding material is insert-molded into the cover.
9. The needle subassembly of claim 1 , wherein the cover is molded from a plastic having conductive additives.
10. The needle subassembly of claim 1 , wherein the cover is molded from a plastic having magnetic additives.
11. The needle subassembly of claim 1 , wherein the cover is made of a magnetic shielding material.
12. The needle subassembly of claim 11 , wherein the shielding material is a highly conductive material.
13. The needle subassembly of claim 11 , wherein the shielding material has a high magnetic permeability.
14. A medical device comprising:
a tissue-penetrating device having a magnetized portion; and
a magnetic shield comprising a removable cover sized to provide a protective closure over the magnetized portion of the tissue-penetrating medical device, wherein the cover comprises a shielding material that prevents the magnetized portion of the tissue-penetrating medical device from being de-magnetized when the cover is positioned to cover the tissue-penetrating medical device;
wherein the removable cover is removed prior to insertion;
wherein the magnetic shield includes a highly conductive material and a ferromagnetic metal coating.
15. The medical device of claim 14 , wherein the shielding material has a high magnetic permeability.
16. The medical device of claim 14 , wherein the shielding material is spray-coated onto a surface of the cover.
17. The medical device of claim 16 , wherein the surface of the cover is an interior surface.
18. The medical device of claim 16 , wherein the surface of the cover is an exterior surface.
19. The medical device of claim 14 , wherein the shielding material is insert-molded into the cover.
20. The medical device of claim 14 , wherein the tissue-penetrating device comprises an introducer needle having a length and a tip, and the cover is sized to cover the tip and the length of the introducer needle.
21. The needle subassembly of claim 1 , wherein the shielding material is composed of 77% nickel, 16% iron, 5% copper and 2% chromium or molybdenum.