التفاصيل البيبلوغرافية
| العنوان: |
Orthopedic Screw System |
| Document Number: |
20070213732 |
| تاريخ النشر: |
September 13, 2007 |
| Appl. No: |
11/684764 |
| Application Filed: |
March 12, 2007 |
| مستخلص: |
An orthopedic screw system. The screw system comprises an outer member and an inner screw. The outer member has a longitudinal inner channel that defines an interior sidewall and is provided with screw threads on its exterior and interior sidewalls. An inner screw has threads constructed and arranged to engage with those on the interior sidewall, such that the inner screw may be secured within the inner channel. When secured within the inner channel, at least a portion of the length of the inner screw extends beyond the outer member. Methods of installing the orthopedic screw system into osteoporotic or otherwise weakened bone are also disclosed. |
| Inventors: |
Khanna, A. Jay (Baltimore, MD, US); Lieberman, Isador H. (Cleveland, OH, US); Ponnusamy, Karthikeyan (Ballwin, MO, US); Gupta, Gaurav (McLean, VA, US); Iyer, Sravisht (Naperville, IL, US); Hui, Alexander (Bellavue, WA, US); Yu, Christopher (Shreveport, LA, US); Trehan, Kartik (Columbia, MD, US) |
| Assignees: |
THE JOHNS HOPKINS UNIVERSITY (Baltimore, MD, US) |
| Claim: |
1. An orthopedic screw system, comprising: an elongate outer member, the outer member having an exterior sidewall, a first end, a second end opposite the first end, and a longitudinal inner channel that extends between and is open at the first and second ends, the inner channel defining an interior sidewall, the exterior and interior sidewalls of the outer member being provided with screw threads, the screw threads of the exterior sidewall being adapted to engage bone; and an elongate inner screw having a shaft with a first shaft end and a second shaft end opposite the first shaft end, the shaft including screw threads along substantially the entirety of its length constructed and adapted to engage the screw threads of the interior sidewall of the outer member so as to bring the outer member and the inner screw into engagement; wherein the outer member and the inner screw are sized and proportioned relative to one another such that in an operative position, at least about 30% of the length of the inner screw extends beyond the second end of the outer member when the inner screw and the outer member are fully engaged with one another. |
| Claim: |
2. The orthopedic screw system of claim 1, wherein the orthopedic screw system is a pedicle screw system. |
| Claim: |
3. The orthopedic screw system of claim 2, wherein the first end of the inner screw shaft is adapted to be positioned proximate to the first end of the outer member when the inner screw and the outer member are fully engaged with one another, and wherein the shaft of the inner screw decreases to a smaller diameter from the first shaft end toward the second shaft end. |
| Claim: |
4. The orthopedic screw system of claim 3, wherein the screw threads of the inner screw increase in width from the first shaft end toward the second shaft end, such that the inner screw as a whole maintains a constant diameter as the shaft of the inner screw tapers to a smaller diameter from the first shaft end toward the second shaft end. |
| Claim: |
5. The orthopedic screw system of claim 2, wherein the outer member tapers to a smaller diameter from the first end of the outer member toward the second end of the outer member. |
| Claim: |
6. The orthopedic screw system of claim 2, wherein about 30% to about 60% of the length of the inner screw extends beyond the second end of the outer member when the inner screw and the outer member are fully engaged with one another. |
| Claim: |
7. The orthopedic screw system of claim 2, wherein the screw threads of the inner screw have a first screw thread pitch proximate to the first shaft end and a second screw thread pitch proximate to the second shaft end. |
| Claim: |
8. The orthopedic screw system of claim 7, wherein the second screw thread pitch is coarser than the first screw thread pitch. |
| Claim: |
9. The orthopedic screw system of claim 2, wherein the outer member is generally cylindrical, and the inner channel is generally cylindrical. |
| Claim: |
10. The orthopedic screw system of claim 2, wherein the first end and the second end of the outer member are generally parallel. |
| Claim: |
11. The orthopedic screw system of claim 1, wherein the inner screw or the outer member further comprises a head constructed and adapted to secure an orthopedic implant. |
| Claim: |
12. A pedicle screw system, comprising: a generally cylindrical outer member having a first end, a second end, and an exterior circumferential surface with a set of outer screw threads formed thereon, the set of outer screw threads being constructed and arranged to engage at least a portion of the pedicle of a vertebra so as to secure the outer member in a fixed position within the pedicle of the vertebra oriented such that the second end of the outer member is oriented toward the vertebral body of the vertebra, the outer member also having a generally longitudinal, generally cylindrical inner channel defined therein, the inner channel extending between and being open at the first and second ends and having inner screw threads formed on an inner circumferential surface of the channel, the inner channel having sufficient diameter to act as a passageway for surgical instruments; an elongate inner screw, the inner screw having a shaft with a first shaft end, a second shaft end opposite the first shaft end, and screw threads formed on the exterior of the shaft, the screw threads on the shaft being constructed and arranged to engage with the inner screw threads of the outer member so as to bring the inner screw into engagement with the outer member when the inner screw is within the inner channel of the outer member; wherein the outer member and the inner screw are sized and proportioned relative to one another such that when they are in an operative position with the inner screw within the channel of the outer member, at least 30% of the length of the inner screw extends beyond the second end of the outer member when the outer member and the inner screw are fully engaged with one another and, with the outer member in the fixed position within the pedicle of the vertebra, at least the inner screw extends into the vertebral body of the vertebra. |
| Claim: |
13. The pedicle screw system of claim 12, wherein the diameter of the inner screw decreases from the first shaft end toward the second shaft end. |
| Claim: |
14. The pedicle screw system of claim 13, wherein the screw threads increase in width from the first shaft end toward the second shaft end, such that the inner screw as a whole maintains a constant diameter from the first end to the second end. |
| Claim: |
15. The pedicle screw system of claim 12, wherein about 30% to about 60% of the length of the inner screw extends beyond the second end of the outer member when the inner screw and the outer member are fully engaged with one another. |
| Claim: |
16. The pedicle screw system of claim 12, wherein the outer member tapers from its first end toward its second end. |
| Claim: |
17. The pedicle screw system of claim 12, wherein the screw threads of the inner channel extend substantially the entirety of the length of the inner channel, such that when the inner screw and outer member are in operative engagement, they are engaged over substantially the entirety of the length of the inner channel. |
| Claim: |
18. A method of performing a vertebral augmentation procedure with pedicle screw insertion, comprising: placing an outer member such that at least a portion of the outer member is within the pedicle of a vertebra, the outer member having an exterior sidewall, a first end, a second end opposite the first end, and a longitudinal inner channel that extends between and is open at the first and second ends, the inner channel defining an interior sidewall, the exterior and interior sidewalls of the outer member being provided with screw threads, the screw threads on the exterior sidewall engaging the vertebral pedicle to secure the outer member; directing bone cement into the vertebral body of the vertebra using the inner channel in the outer member; and placing an inner screw within the inner channel such that screw threads of the inner screw engage with the screw threads of the interior sidewall such that, when the inner screw and the outer member are in full engagement, at least about 30% of the length of the inner screw extends beyond the second end of the outer member, with at least a portion of the length of the inner screw extending into the bone cement. |
| Claim: |
19. The method of claim 18, further comprising, before directing bone cement into the vertebral body: inserting a balloon catheter into the vertebral body through the inner channel in the outer member; and inflating the balloon of the balloon catheter to create a cavity in the vertebral body. |
| Claim: |
20. The method of claim 19, wherein directing bone cement into the vertebral body comprises directing cement into the cavity in the vertebral body. |
| Claim: |
21. The method of claim 18, wherein placing the outer member comprises placing the outer member with the inner screw engaged within it and then removing the inner screw from the outer member. |
| Claim: |
22. An orthopedic screw system, comprising: an elongate outer member, the outer member having an exterior sidewall, a first end, a second end opposite the first end, and a longitudinal inner channel that extends between and is open at the first and second ends, the inner channel defining an interior sidewall, the exterior and interior sidewalls of the outer member being provided with screw threads, the screw threads of the exterior sidewall being adapted to engage bone, the outer diameter of the outer member decreasing from the first end toward the second end; and an elongate inner screw having a shaft with a first shaft end proximate to the head and a second shaft end opposite the first shaft end, the shaft including screw threads constructed and adapted to engage the screw threads of the interior sidewall of the outer member so as to bring the outer member and the inner screw into engagement, the screw threads of the shaft increasing in width from the first shaft end toward the second shaft end; wherein the outer member and the inner screw are sized and proportioned relative to one another such that in an operative position, at least a portion of the length of the inner screw extends beyond the second end of the outer member when the inner screw and the outer member are fully engaged with one another. |
| Claim: |
23. The orthopedic screw system of claim 22, wherein the diameter of the shaft decreases from the first shaft end toward the second shaft end. |
| Claim: |
24. The orthopedic screw system of claim 23, wherein with the diameter of the shaft decreasing from the first shaft end toward the second shaft end and the width of the shaft screw threads increasing from the first shaft end toward the second shaft end, the inner screw as a whole maintains a constant diameter. |
| Claim: |
25. The orthopedic screw system of claim 22, wherein an outer diameter of the outer member decreases from the first end toward the second end. |
| Claim: |
26. The orthopedic screw system of claim 22, wherein at least about 30% of the length of the inner screw extends beyond the second end of the outer member when the inner screw and the outer member are fully engaged with one another. |
| Claim: |
27. The orthopedic screw system of claim 22, wherein about 30% to about 60% of the length of the inner screw extends beyond the second end of the outer member when the inner screw and the outer member are fully engaged with one another. |
| Claim: |
28. The orthopedic screw system of claim 22, wherein the length of the outer member is about 50% of the length of the inner screw. |
| Claim: |
29. A method of performing orthopedic surgery, comprising: fixing an outer member in a bone, the outer member having: an exterior sidewall, a first end, a second end opposite the first end, and a longitudinal inner channel that extends between and is open at the first and second ends, the inner channel defining an interior sidewall, the exterior and interior sidewalls of the outer member being provided with screw threads, the screw threads of the exterior sidewall being adapted to engage bone, the outer diameter of the outer member decreasing from the first end toward the second end; and securing an inner screw within the outer member such that screw threads of the inner screw engage the screw threads of the interior sidewall of the outer member, and when the inner screw and the outer member are fully engaged, at least about 30% of the length of the inner screw extends beyond the second end of the outer member. |
| Claim: |
30. The method of claim 29, further comprising, before securing the inner screw, accessing an interior portion of the bone through the inner channel. |
| Claim: |
31. The method of claim 29, wherein fixing the outer member in the bone comprises fixing the outer member, at least in part, in cortical bone, such that the first end of the outer member is fixed proximate to the outer surface of the bone. |
| Claim: |
32. The method of claim 31, wherein, when the inner screw and the outer member are fully engaged, the inner screw extends into cancellous bone. |
| Claim: |
33. The method of claim 32, wherein fixing the outer member in the bone comprises fixing the outer member with the inner screw secured within the outer member and then removing the inner screw from the outer member. |
| Claim: |
34. A method of fixing an orthopedic screw into weakened bone, comprising: fixing an outer member, at least in part, in cortical bone, such that a first end of the outer member is fixed proximate to an outer surface of the weakened bone, the outer member having an exterior sidewall, a second end opposite the first end, and a longitudinal inner channel that extends between and is open at the first and second ends, the inner channel defining an interior sidewall, the exterior and interior sidewalls of the outer member being provided with screw threads, the screw threads of the exterior sidewall being adapted to engage bone, the outer diameter of the outer member decreasing from the first end toward the second end; depositing bone cement into the weakened bone through the inner channel; and securing an inner screw within the outer member such that screw threads of the inner screw engage the screw threads of the interior sidewall of the outer member, and when the inner screw and the outer member are fully engaged, at least a portion of the length of the inner screw extends beyond the second end of the outer member and into surrounding structures. |
| Current U.S. Class: |
606/73 |
| Current International Class: |
61 |
| رقم الانضمام: |
edspap.20070213732 |
| قاعدة البيانات: |
USPTO Patent Applications |
