US20050038438A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distraction screw
Assignee: DePuy Spine LLC
•
Filing: 2003-08-11
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Granted: —
•
Expires: 2023-08-11
Abstract
Abstract A simple, safe implantable bone screw, and a method for distracting two bone segments, is provided. In general, the bone screw includes a shank having a threaded proximal portion and a distal portion with a major diameter that is less than a minor diameter of the threaded proximal portion. A transitional region of decreasing diameter can be disposed between the threaded proximal portion and the distal portion, and a driver receiving element is preferably disposed on a proximal end of the bone screw. In use, the proximal and distal portions of the bone screw are adapted to engage two segments of bone, and to create a distraction force between the two segments of bone.
Inventors
- 👤 David Anderson
- 👤 Conor McCrea
- 👤 Christopher Ramsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:46
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61B17/863; A61B17/70; A61B17/7071; A61B17/8635; A61B2017/00004
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
66 words
1 . A bone screw for distracting two segments of bone, comprising a shank having a threaded proximal portion and a distal portion, the distal portion having a major diameter that is less than a minor diameter of the threaded proximal portion, wherein the proximal and distal portions of the shank are configured to create a distraction force therebetween when inserted into two segments of bone.
Claim 2
Dependent Claim
66 words
1 . A bone screw for distracting two segments of bone, comprising a shank having a threaded proximal portion and a distal portion, the distal portion having a major diameter that is less than a minor diameter of the threaded proximal portion, wherein the proximal and distal portions of the shank are configured to create a distraction force therebetween when inserted into two segments of bone.
Claim 3
Dependent Claim
18 words
2 . The bone screw of claim 1 , wherein the distal portion has a thread formed thereon.
Claim 4
Dependent Claim
33 words
3 . The bone screw of claim 1 , wherein the thread on the distal portion has a pitch that is less than a pitch of the thread on the threaded proximal portion.
Claim 5
Dependent Claim
17 words
4 . The bone screw of claim 1 , wherein the bone screw is self-tapping and/or self-drilling.
Claim 6
Dependent Claim
29 words
5 . The bone screw of claim 1 , wherein the thread on the threaded proximal portion has a pitch that varies along a length of the proximal portion.
Claim 7
Dependent Claim
54 words
6 . The bone screw of claim 1 , wherein the proximal and distal portions of the shank are removably mated to one another, and wherein the proximal portion is adapted to mate to the distal portion such that at least a portion of the distal portion expands upon engagement by the proximal portion.
Claim 8
Dependent Claim
22 words
7 . The bone screw of claim 1 , wherein a major diameter of the distal portion decreases in a proximal-to-distal direction.
Claim 9
Dependent Claim
27 words
8 . The bone screw of claim 1 , wherein the distal portion has a stepped diameter such that the diameter incrementally decreases in a proximal-to-distal direction.
Claim 10
Dependent Claim
25 words
9 . The bone screw of claim 1 , wherein the distal portion includes at least one barb protruding therefrom and adapted to engage bone.
Claim 11
Dependent Claim
27 words
10 . The bone screw of claim 1 , further comprising a transitional region of decreasing diameter disposed between the threaded proximal portion and the distal portion.
Claim 12
Dependent Claim
15 words
11 . The bone screw of claim 10 , wherein the transitional region is unthreaded.
Claim 13
Dependent Claim
15 words
12 . The bone screw of claim 10 , wherein the transitional region is tapered.
Claim 14
Dependent Claim
14 words
13 . The bone screw of claim 1 , wherein the shank is cannulated.
Claim 15
Dependent Claim
24 words
14 . The bone screw of claim 1 , wherein at least a portion of the screw is coated with a bone growth-promoting material.
Claim 16
Dependent Claim
33 words
15 . The bone screw of claim 14 , wherein the bone growth-promoting material is selected from the group consisting of hydroxyapatite, calcium phosphate, bioactive glasses, plasmas, ceramics, porous materials, and combinations thereof.
Claim 17
Dependent Claim
24 words
16 . The bone screw of claim 1 , wherein at least a portion of the screw is made from a cortical bone graft.
Claim 18
Dependent Claim
24 words
17 . The bone screw of claim 1 , further comprising a driver receiving element disposed on a proximal end of the bone screw.
Claim 19
Dependent Claim
30 words
18 . The bone screw of claim 17 , wherein the driver receiving element comprises a hexagonally-shaped socket formed in the proximal-most end of the proximal portion of the shank.
Claim 20
Dependent Claim
30 words
19 . The bone screw of claim 17 , wherein the driver receiving element comprises a hexagonally-shaped head formed in the proximal-most end of the proximal portion of the shank.
Claim 21
Dependent Claim
68 words
20 . A bone screw comprising: a shank having a threaded proximal portion and a threaded distal portion, the threaded distal portion including at least one thread having a pitch that is less than a pitch of a thread of the threaded proximal portion, at least a portion of the distal portion having a major diameter that is less than a minor diameter of the threaded proximal portion.
Claim 22
Dependent Claim
68 words
20 . A bone screw comprising: a shank having a threaded proximal portion and a threaded distal portion, the threaded distal portion including at least one thread having a pitch that is less than a pitch of a thread of the threaded proximal portion, at least a portion of the distal portion having a major diameter that is less than a minor diameter of the threaded proximal portion.
Claim 23
Dependent Claim
89 words
21 . A bone screw comprising: a shank having a proximal portion having at least one thread formed thereon, the at least one thread having a first pitch in a proximal region of the proximal portion and a second pitch in a distal region of the proximal portion, and a distal portion having at least one thread formed thereon, the at least one thread having a third pitch; wherein the second pitch is proximate in size to the third pitch and is distinct in size from the first pitch.
Claim 24
Dependent Claim
89 words
21 . A bone screw comprising: a shank having a proximal portion having at least one thread formed thereon, the at least one thread having a first pitch in a proximal region of the proximal portion and a second pitch in a distal region of the proximal portion, and a distal portion having at least one thread formed thereon, the at least one thread having a third pitch; wherein the second pitch is proximate in size to the third pitch and is distinct in size from the first pitch.
Claim 25
Dependent Claim
19 words
22 . The bone screw of claim 21 , wherein the third pitch is less than the first pitch.
Claim 26
Dependent Claim
28 words
23 . The bone screw of claim 21 , wherein the second pitch is greater than or equal to the third pitch and less than the first pitch.
Claim 27
Dependent Claim
38 words
24 . The bone screw of claim 21 , wherein the at least one thread in the distal region of the proximal portion is shaped to inhibit back-out of the screw when the screw is implanted in bone.
Claim 28
Dependent Claim
34 words
25 . The bone screw of claim 21 , wherein the at least one thread on the proximal portion comprises a single thread extending between the proximal and distal regions of the proximal portion.
Claim 29
Dependent Claim
45 words
26 . The bone screw of claim 21 , wherein the at least one thread on the proximal portion comprises a first thread formed on the proximal region of the proximal portion and a second thread formed on the distal region of the proximal portion.
Claim 30
Dependent Claim
63 words
27 . A bone screw for distracting two segments of bone, comprising: a shank having a thread formed thereon and extending between a proximal end and a distal end, the thread having a pitch that gradually decreases in a proximal-to-distal direction along a length of the shank; and a driver receiving element formed on or coupled to a proximal end of the shank.
Claim 31
Dependent Claim
63 words
27 . A bone screw for distracting two segments of bone, comprising: a shank having a thread formed thereon and extending between a proximal end and a distal end, the thread having a pitch that gradually decreases in a proximal-to-distal direction along a length of the shank; and a driver receiving element formed on or coupled to a proximal end of the shank.
Claim 32
Dependent Claim
95 words
28 . A method of expanding the spinal canal, comprising: providing a bone screw having a shank including proximal and distal portions that are configured to create a distraction force therebetween when inserted into two segments of bone; forming a hole in the pedicle of a vertebral body adjacent to the spinous process; cutting the pedicle across the hole and adjacent to the vertebral body to form two bone portions; advancing the bone screw into the hole, wherein the proximal and distal portions of the bone screw expand the distance between the two bone portions.
Claim 33
Dependent Claim
95 words
28 . A method of expanding the spinal canal, comprising: providing a bone screw having a shank including proximal and distal portions that are configured to create a distraction force therebetween when inserted into two segments of bone; forming a hole in the pedicle of a vertebral body adjacent to the spinous process; cutting the pedicle across the hole and adjacent to the vertebral body to form two bone portions; advancing the bone screw into the hole, wherein the proximal and distal portions of the bone screw expand the distance between the two bone portions.
Claim 34
Dependent Claim
23 words
29 . The method of claim 28 , wherein at least one of the proximal and distal portions includes a thread formed thereon.
Claim 35
Dependent Claim
44 words
30 . The method of claim 28 , wherein the proximal and distal portions each include a thread formed thereon, and wherein the thread on the distal portion has a pitch that is less than a pitch of the thread on the proximal portion.
Claim 36
Dependent Claim
30 words
31 . The method of claim 28 , wherein the proximal portion includes a thread formed thereon that has a pitch that varies along a length of the proximal portion.
Claim 37
Dependent Claim
27 words
32 . The method of claim 28 , wherein at least a portion of the bone screw is coated with or formed from a bone growth-promoting material.
Claim 38
Dependent Claim
30 words
33 . The method of claim 28 , wherein the bone screw further includes a driver receiving element located on a proximal end of the proximal portion of the shank.
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