US6893443B2 — Angle-adjustable bone screw and fixation device

Claim 1

Independent Claim 143 words

A bone fixation assembly comprising: a bone fastener comprising a head, a shank sized and configured to be anchored into bone, and at least one collar arranged in-between the head and shank, the at least one collar having a top surface, a bottom surface and a lateral sidewall extending between the top surface and the bottom surface, the intersection of the lateral sidewall with the bottom surface forming a substantially sharp edge; and a receiving member comprising at least one bore that defines an inner surface having a first portion and a second portion, the first portion has a substantially constant diameter and the second portion is substantially concave; wherein the sharp edge of the at least one collar contacts the concave second portion of the receiving member so that the bone fastener can he variably positioned with respect to the receiving member.

Claim 2

Dependent Claim 143 words

A bone fixation assembly comprising: a bone fastener comprising a head, a shank sized and configured to be anchored into bone, and at least one collar arranged in-between the head and shank, the at least one collar having a top surface, a bottom surface and a lateral sidewall extending between the top surface and the bottom surface, the intersection of the lateral sidewall with the bottom surface forming a substantially sharp edge; and a receiving member comprising at least one bore that defines an inner surface having a first portion and a second portion, the first portion has a substantially constant diameter and the second portion is substantially concave; wherein the sharp edge of the at least one collar contacts the concave second portion of the receiving member so that the bone fastener can he variably positioned with respect to the receiving member.

Claim 3

Dependent Claim 40 words

The bone fixation assembly of claim 1 , wherein the concave portion has a radius of curvature and the ratio of half the diameter of the first portion to the radius of curvature is between about 0.5 and about 1.0.

Claim 4

Dependent Claim 31 words

The bone fixation assembly of claim 2 , wherein the ratio of half the diameter of the first portion to the radius of curvature is between about 0.85 and about 0.95.

Claim 5

Dependent Claim 31 words

The bone fixation assembly of claim 1 , wherein the fastener has a longitudinal axis and the at least one collar has a generally circular cross-section transverse to the longitudinal axis.

Claim 6

Dependent Claim 19 words

The bone fixation assembly of claim 4 , wherein the at least one collar has a substantially constant diameter.

Claim 7

Dependent Claim 25 words

The bone fixation assembly of claim 5 , wherein the at least one collar has a diameter between about 4 mm and about 10 mm.

Claim 8

Dependent Claim 26 words

The bone fixation assembly of claim 5 , wherein the at least one collar has a combined thickness between about 0.5 mm and about 2 mm.

Claim 9

Dependent Claim 19 words

The bone fixation assembly of claim 1 , wherein the fastener head is convex with respect to the shank.

Claim 10

Dependent Claim 20 words

The bone fixation assembly of claim 8 , wherein at least a portion of the fastener head is substantially semispherical.

Claim 11

Dependent Claim 18 words

The bone fixation assembly of claim 1 , wherein the fastener head is integrally formed with the shank.

Claim 12

Dependent Claim 18 words

The bone fixation assembly of claim 1 , wherein the fastener head is removably attached to the shank.

Claim 13

Dependent Claim 34 words

The bone fixation assembly of claim 1 , further comprising a clamping member, wherein the clamping member is capable of locking the bone fastener with respect to the receiving member in a fixed configuration.

Claim 14

Dependent Claim 16 words

The bone fixation assembly of claim 12 , wherein the clamping member is a grub screw.

Claim 15

Dependent Claim 28 words

The bone fixation assembly of claim 12 , wherein the clamping member is releasably associated with the receiving member for releasably locking the assembly in a fixed configuration.

Claim 16

Dependent Claim 19 words

The bone fixation assembly of claim 12 , wherein the clamping member is threadably associated with the receiving member.

Claim 17

Dependent Claim 33 words

The bone fixation assembly of claim 1 , wherein the inner surface comprises a deformable material such that a form-fit connection is obtainable between the at least one collar and the receiving member.

Claim 18

Dependent Claim 35 words

The bone fixation assembly of claim 1 , wherein the receiving member further comprises a channel extending transverse to a central axis of the bore, the channel configured and dimensioned to receive a longitudinal support.

Claim 19

Dependent Claim 20 words

The bone fixation assembly of claim 1 , wherein the first portion is cylindrical and the concave portion is spherical.

Claim 20

Dependent Claim 16 words

The bone fixation assembly of claim 1 , wherein the receiving member is a bone plate.

Claim 21

Dependent Claim 58 words

The bone fixation assembly of claim 19 , wherein the bore formed in the bone plate includes an internally threaded portion for receiving a grub screw so that rotation of the grub screw presses the grub screw against the head of the bone fastener to fix the position of the bone fastener with respect to the bone plate.

Claim 22

Dependent Claim 21 words

The bone fixation assembly of claim 1 , wherein the receiving member interconnects the bone fastener to a longitudinal spinal rod.

Claim 23

Dependent Claim 41 words

The bone fixation assembly of claim 21 , wherein the receiving member further includes a transverse channel for receiving the longitudinal spinal rod and clamping means for fixing the position of the longitudinal spinal rod with respect to the bone fastener.

Claim 24

Dependent Claim 23 words

The bone fixation assembly of claim 1 , wherein the head of the fastener is removably attached to the shank of the fastener.

Claim 25

Dependent Claim 40 words

The bone fixation assembly of claim 23 , wherein the head of the fastener includes a conical peg and the shank of the fastener includes a bore so that the head is attached to the shank by a cone connection.

Claim 26

Dependent Claim 41 words

The bone fixation assembly of claim 23 , wherein the head of the fastener includes a threaded peg and the shank of the fastener includes a threaded bore so that the head is attached to the shank by a screw connection.

Claim 27

Dependent Claim 55 words

The bone fixation assembly of claim 23 , wherein the head of the fastener includes a peg with a radially protruding pin and the shank of the fastener includes a bore with a groove sized and configured to receive the pin so that the head is attached to the shank by a bayonet type connection.

Claim 28

Dependent Claim 34 words

The bone fixation assembly of claim 1 , wherein the fastener includes a plurality of collars, each collar being arranged in-between the head of the bone fastener and the shank of the bone fastener.

Claim 29

Dependent Claim 38 words

The bone fixation assembly of claim 27 , wherein each collar is circular with a diameter and the shank of the fastener has a diameter, the diameters of the collar being greater than the diameter of the shank.

Claim 30

Dependent Claim 46 words

The bone fixation assembly of claim 28 , wherein the collars are arranged so that the diameter of the collars decrease as one moves from the head of the fastener towards the shank of the fastener so that the collars form a plurality of stepped edges.

Claim 31

Dependent Claim 20 words

The bone fixation assembly of claim 29 , wherein the stepped edges of the collars form an imaginary convex surface.

Claim 32

Dependent Claim 34 words

The bone fixation assembly of claim 28 , wherein the concave portion of the bore has a diameter D so that the diameter of the collars are less than diameter D of the bore.

Claim 33

Dependent Claim 27 words

The bone fixation assembly of claim 31 , wherein the ratio of the diameters of the collars to the diameter D of the bore 0.5 to 1.0.

Claim 34

Dependent Claim 28 words

The bone fixation assembly of claim 32 , wherein the ratio of the diameters of the collars to the diameter D of the bore is 0.85 to 0.95.

Claim 35

Independent Claim 104 words

A device for osteosynthetic bone fixation comprising: a bone fastener comprising a plurality of collars and a shank sized and configured to be anchored into bone, each collar having a top planar surface, a bottom planar surface and a lateral sidewall extending between the top surface and the bottom surface, the intersection of the lateral sidewall with the bottom surface forming a substantially sharp edge; and a receiving member comprising at least one bore that defines an inner surface with a first cylindrical portion and a second non-cylindrical portion, wherein the sharp edges of the collar abuts the non-cylindrical portion at a selectable angle.

Claim 36

Independent Claim 104 words

A device for osteosynthetic bone fixation comprising: a bone fastener comprising a plurality of collars and a shank sized and configured to be anchored into bone, each collar having a top planar surface, a bottom planar surface and a lateral sidewall extending between the top surface and the bottom surface, the intersection of the lateral sidewall with the bottom surface forming a substantially sharp edge; and a receiving member comprising at least one bore that defines an inner surface with a first cylindrical portion and a second non-cylindrical portion, wherein the sharp edges of the collar abuts the non-cylindrical portion at a selectable angle.

Claim 37

Dependent Claim 25 words

The device of claim 34 , wherein the bone fastener has a longitudinal axis and the collar are disposed generally concentric to the longitudinal axis.

Claim 38

Dependent Claim 18 words

The device of claim 35 , wherein the sharp edges are disposed generally concentric to the longitudinal axis.

Claim 39

Dependent Claim 26 words

The device of claim 36 , wherein the sharp edges form a substantially circular line and wherein each edge is disposed along an imaginary convex surface.

Claim 40

Dependent Claim 13 words

The device of claim 37 , wherein the imaginary convex surface is spherical.

Claim 41

Dependent Claim 14 words

The device of claim 35 , wherein each collar has a substantially constant diameter.

Claim 42

Dependent Claim 19 words

The device of claim 39 , wherein the diameters are is between about 4 mm and about 10 mm.

Claim 43

Dependent Claim 21 words

The device of claim 35 , wherein the collars have a combined thickness between about 0.5 mm and about 2 mm.

Claim 44

Dependent Claim 22 words

The device of claim 35 , wherein the bone fastener further comprises a head that is convex with respect to the shank.

Claim 45

Dependent Claim 17 words

The device of claim 42 , wherein at least a portion of the head is substantially semispherical.

Claim 46

Dependent Claim 15 words

The device of claim 42 , wherein the head is integrally formed with the shank.

Claim 47

Dependent Claim 16 words

The device of claim 42 , wherein the fastener head is removably attached to the shank.

Claim 48

Dependent Claim 33 words

The device of claim 35 , wherein the receiving member further comprises a channel extending transverse to a central axis of the bore, the channel configured and dimensioned to receive a longitudinal support.

Claim 49

Dependent Claim 21 words

The device of claim 34 , further comprising a clamping member, wherein the collar is releasably lockable by the clamping member.

Claim 50

Dependent Claim 14 words

The device of claim 47 , wherein the clamping member is a grub screw.

Claim 51

Dependent Claim 13 words

The device of claim 47 , wherein the clamping member is a nut.

Claim 52

Dependent Claim 127 words

A bone fixation system comprising: a bone screw having a longitudinal axis, a head; a shank; and a collar disposed between the head and shank and comprising a top portion and a plurality of lower portions, at least two adjacent lower portions forming at least one edge generally concentric to a longitudinal axis of the bone screw, wherein each edge is disposed along an imaginary convex surface that is generally spherical; and a receiving member comprising at least one bore having a longitudinal axis, the bore defining an inner surface having an upper portion and a lower generally spherical portion for contacting the imaginary convex surface for permitting the longitudinal axis of the bone screw to be angulated with respect to the longitudinal axis of the bore.

Claim 53

Dependent Claim 127 words

A bone fixation system comprising: a bone screw having a longitudinal axis, a head; a shank; and a collar disposed between the head and shank and comprising a top portion and a plurality of lower portions, at least two adjacent lower portions forming at least one edge generally concentric to a longitudinal axis of the bone screw, wherein each edge is disposed along an imaginary convex surface that is generally spherical; and a receiving member comprising at least one bore having a longitudinal axis, the bore defining an inner surface having an upper portion and a lower generally spherical portion for contacting the imaginary convex surface for permitting the longitudinal axis of the bone screw to be angulated with respect to the longitudinal axis of the bore.

Claim 54

Dependent Claim 13 words

The bone screw of claim 50 , wherein the collar has two edges.

Claim 55

Dependent Claim 18 words

The bone screw of claim 51 , wherein at least a portion of the head is substantially semispherical.

Claim 56

Dependent Claim 16 words

The bone screw of claim 52 , wherein the head is integrally formed with the shank.

Claim 57

Dependent Claim 15 words

The bone screw of claim 52 , wherein the head and shank are separately formed.

Claim 58

Dependent Claim 16 words

The bone screw of claim 54 , wherein the head is releasably associated with the shank.

Claim 59

Dependent Claim 16 words

The bone screw of claim 54 , wherein the head is threadably associated with the shank.

Claim 60

Dependent Claim 39 words

The bone screw of claim 54 , wherein the head is connected to the shank by a conical peg that is received in a conical bore, with the conical peg and conical bore being disposed along the longitudinal axis.

Claim 61

Dependent Claim 19 words

The bone screw of claim 54 , wherein the head is connected to the shank by a bayonet lock.

Claim 62

Dependent Claim 19 words

The bone screw of claim 52 , wherein the bead further comprises a zenith disposed on the longitudinal axis.

Claim 63

Dependent Claim 29 words

The bone screw of claim 50 , wherein each edge has a diameter, and the diameters of the edges decrease as a function of increasing distance from the head.

Claim 64

Dependent Claim 12 words

The bone screw of claim 60 , wherein the collar is disk-shaped.

Claim 65

Dependent Claim 17 words

The bone screw of claim 50 , wherein the head is convex with respect to the shank.

Claim 66

Dependent Claim 26 words

The bone screw of claim 50 , wherein each edge forms a generally circular shape having a diameter between about 4 mm and about 10 mm.

Claim 67

Dependent Claim 26 words

The bone screw of claim 50 , wherein each edge forms a generally circular shape having a diameter between about 8 mm and about 10 mm.

Claim 68

Dependent Claim 30 words

The bone screw of claim 50 , wherein the collar has a thickness defined between a top surface and a bottom surface between about 0.5 mm and about 2 mm.

Claim 69

Dependent Claim 22 words

The bone screw of claim 50 , wherein the shank has an external diameter between about 3 mm and about 6 mm.

Claim 70

Dependent Claim 15 words

The bone screw of claim 50 , wherein each edge forms a substantially circular shape.

Claim 71

Dependent Claim 13 words

The bone screw of claim 50 , wherein each edge is substantially sharp.

Claim 72

Dependent Claim 130 words

A bone fixation assembly comprising; a bone fastener comprising a head, a shank having threads to be anchored into bone, and a plurality of disk-shape collars, each collar having a top surface, a bottom surface and a lateral sidewall extending between the top surface and the bottom surface, the intersection of the lateral sidewall with the bottom surface forming a substantially sharp edge; and a receiving member comprising at least one bore that defines an inner surface with a first cylindrical portion and a second non-cylindrical portion, wherein the diameters of the collars are sized and configured so that they decrease from the head to the shank so that the sharp edges of the collars form an imaginary convex surface, each of the sharp edges containing the second non-cylindrical portion.

Claim 73

Dependent Claim 130 words

A bone fixation assembly comprising; a bone fastener comprising a head, a shank having threads to be anchored into bone, and a plurality of disk-shape collars, each collar having a top surface, a bottom surface and a lateral sidewall extending between the top surface and the bottom surface, the intersection of the lateral sidewall with the bottom surface forming a substantially sharp edge; and a receiving member comprising at least one bore that defines an inner surface with a first cylindrical portion and a second non-cylindrical portion, wherein the diameters of the collars are sized and configured so that they decrease from the head to the shank so that the sharp edges of the collars form an imaginary convex surface, each of the sharp edges containing the second non-cylindrical portion.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2008-05-16	2008-11-15	2009-05-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2012-05-16	2012-11-15	2013-05-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2016-05-16	2016-11-15	2017-05-17	$7700.00	Window Closed / Lapsed

Angle-adjustable bone screw and fixation device

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