CA2367088C - Bone plate with conical screw threads - Google Patents
Bone plate with conical screw threads Download PDFInfo
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- CA2367088C CA2367088C CA002367088A CA2367088A CA2367088C CA 2367088 C CA2367088 C CA 2367088C CA 002367088 A CA002367088 A CA 002367088A CA 2367088 A CA2367088 A CA 2367088A CA 2367088 C CA2367088 C CA 2367088C
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
- A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8004—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for distracting or compressing the bone or bones
- A61B17/8014—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for distracting or compressing the bone or bones the extension or compression force being caused by interaction of the plate hole and the screws
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- Orthopedic Medicine & Surgery (AREA)
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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Abstract
The bone plate comprises a top side (1), an underside (2) to make contact with the bone, and several holes (4) mounted along the longitudinal plate axis (3) and connecting the top side and the underside (1) and (2) to receive bone screws (11).
The diameter DL of at least one of these holes (4) is larger along the longitudinal plate axis (3) than this hole's diameter DQ transverse to the longitudinal plate axis (3). At least one of these holes (4) is fitted with an inside thread (5). This inside thread (5) tapers conically toward the bone plate's underside.
The bone plate allows application as a compression plate and as a so-called inner affixation system without entailing tradeoffs.
The diameter DL of at least one of these holes (4) is larger along the longitudinal plate axis (3) than this hole's diameter DQ transverse to the longitudinal plate axis (3). At least one of these holes (4) is fitted with an inside thread (5). This inside thread (5) tapers conically toward the bone plate's underside.
The bone plate allows application as a compression plate and as a so-called inner affixation system without entailing tradeoffs.
Description
BONE PLATE WITH CONICAL SCREW THREADS
FIELD OF THE INVENTION
The present invention relates generally to devices for fixation of parts of a fractured bone and more specifically, to bone plates and systems for stabilization and/or compression of parts of a fractured bone.
BACKGROUND OF THE INVENTION
Bone plates may generally be utilized to carry out two different types of osteosynthesis, namely "rigid osteosynthesis" and "flexible osteosynthesis."
Rigid osteosynthesis is used for medical care of joint fractures, simple shaft fractures (where nailing is impossible) as well as for osteotomies. Aside from the possibility of anatomical repositioning, the bone itself supports and stabilizes the osteosynthesis, which allows for the possibility of putting stress on the extremity earlier and without pain.
Additional advantages of the medical care of stable fractures can be observed when the blood circulation in the bone is greatly diminished due to trauma. For treating "nonunions" or in the case of existing infection, the fracture must be kept stable in order to make bone healing possible and so as not to irritate the infection further by instability of the fracture gap.
Flexible osteosynthesis, also known as "biological osteosynthesis," may be desirable in the medical treatment of comminuted fractures in the shaft region of tubular bones. In the case of these fractures, it is an objective to maintain the proper length of the bone and to fix the bone ends (joints) in their proper anatomic positions with respect to one another. With flexible osteosynthesis, the fracture zone is not directly affixed or manipulated, and consequently, the blood circulation in this area is not inhibited. Bone plates designed for flexible osteosynthesis thus operate similarly to a locking, intramedullary nail, which is anchored only in the metaphyses.
Since fractures cannot always be treated with one type of osteosynthesis, surgeons must frequently compromise because a bone plate, which allows him to combine the two types of osteosynthesis discussed above, is not available. Such a combination would be beneficial, for example, when a joint fracture can be compressed with traction screws through the bone plate and the whole of the joint may be connected to the diaphysis over an internal fixative with angularly stable screws. Another illustrative application concerns porotic bones, where a bone plate with axially and angularly stable screws can be anchored in the metaphysial fragment, with a stable plate-affixation being undertaken in the diaphyseal range with the assistance of a plate traction screw through the fracture. A
primary fracture stabilization can be achieved by this type of procedure.
This situation has led to the development and marketing of bone implants for both types of osteosynthesis. The two types of implant group, however, are designed specifically for their respective method. Thus, the disadvantages of these two systems lies in the difficulty in combining them.
Thus, a need exists for improved bone plates that provide for both rigid and flexible osteosynthesis.
SUMMARY OF THE INVENTION
The present invention is directed to a bone plate that is adapted to be used for both rigid and flexible osteosynthesis, without compromising the plates ability to be used for either type of osteosynthesis. Accordingly, the bone plate of the present invention may be used as a compression plate or as an internal fixative.
According to one embodiment of the invention, the bone plate includes an upper surface, a bone contacting surface, and a plurality of holes extending through the upper and bone contacting surfaces. At least one of the holes is elongated in a direction substantially aligned with a longitudinal axis of the plate, and includes a threaded portion and a non-threaded portion. The threaded portion may extend over a range of greater than about 180 with respect to a central axis of the hole. The threaded portion of the hole is dimensioned and configured to engage a threaded head of a bone screw, and fix the bone screw at a predetermined angle with respect to the bone plate. Preferably, the threaded portion extends through the full thickness of the bone plate, i.e., from the upper surface to the bone contacting surface, thus maximizing the stability of the bone screw to bone plate interface.
With the threaded screw head fixed in the threaded portion of the elongated hole, the bone plate may be used as an internal fixative. Use in this configuration, however, creates high stresses at the interface of the bone plate and screw head because the plate is not forced against the bone, and therefore, the bone fracture is fixed primarily by friction between the plate and the bone. This increase in stress is taken into account by the threaded portion of the hole extending over a range of at least about 180 with respect to a central axis of the hole, and thereby enclosing the screw head in at least this angular range.
This feature of the bone plate is especially advantageous where thin bone plates are involved. Preferably, the threaded portion is disposed on one of the two longitudinal ends of the hole. This positioning allows for the threaded portion to extend over a larger angular range. For example, the threaded portion may extend over a range of between about 190 and about 280 , and preferably over a range of between about 200 to 250 , thus maximizing the strength of the bone screw to bone plate interface.
According to another embodiment of the present invention, at least one of the holes may include a threaded portion that is angled or tapered with respect to a central axis of the hole. More specifically, the threaded portion may conically taper inward towards the bone-contacting surface of the bone plate. A bone screw to be rigidly fixed to the bone plate may include a threaded screw head that is tapered to substantially match the tapered shape of the threaded portion of the hole. Thus, the bone screw may be rigidly fixed to the bone plate by engagement between the matching conical threads.
This method of attachment is especially advantageous when self-drilling screws are to be used since, due to the conical shape of the matching threads, the screw may be inserted into the bone independently of the plate. More specifically, the screw head becomes rigidly clamped to the plate only as the threaded screw head penetrates the threaded portion of the hole.
Despite any initial misalignment between the threads on the screw head (the position of which are initially dictated by the orientation of the bone screw in the bone) and the threads on the bone plate, the conical shape of the mating threads ensures that the threads on the screw head will ultimately align with the threaded portion of the hole.
When the conical thread screw head is tightened into the threaded portion of the hole, the screw head creates radial forces in the plate hole. Thus, the bone plate must be dimensioned and configured to withstand these high radial forces, e.g., to withstand flexing of the walls of the screw holes in the bone plate.
The threaded portion preferably tapers at a cone angle of between about 5 and about 20 . Preferably, the thread tapers at a cone angle of about 10 .
In the case where the threaded portion of the hole is tapered, as discussed above, the threaded portion may extend through a different angle when measured at the upper surface than when measured at the bone-contacting surface. For example, when measured at the upper surface, the threaded portion may extend through a first angle of between about 200 and about 270 , while when measured at the bone-contacting surface, the threaded portion may extend through a second angle of between about 180 and about 230 .
According to another aspect of the present invention, at least one of the holes may be dimensioned and configured to receive a ball shaped head of a bone screw and provide for compression of two fractured bone fragments. For example, according to one embodiment, the non-threaded portion of the elongated hole, discussed above, may include a concave, substantially spherical recess at the upper surface. The recess may be dimensioned and configured to accommodate the spherical head of a conventional bone screw. Such an arrangement may be especially useful when the bone screw is put in place eccentrically with respect to the hole, as is necessary for attaining compression of a fracture. Additionally, the non-threaded portion of the hole may flare outward in the area of the bone contacting surface to provide for increased angulation of the bone screw with respect to the bone plate.
The threaded portion of the hole may be positioned closer to the end of the elongated hole that is closer to the center of the plate, thus avoiding any undesirable effects on the compression capability of the non-threaded portion. Thus, when the bone plate is used as a compression plate, the geometry of the non-threaded portion (compression portion) is not adversely affected by the presence of the threaded portion.
As discussed above, the hole may be elongated. Thus, the elongated hole may define first and second dimensions on the bone contacting surface, wherein the first dimension DL is substantially parallel to the longitudinal axis of the bone plate and the second dimension DQ is substantially perpendicular to the longitudinal axis.
The ratio of DL/DQ may be within the range of about 1.1 to 3, and preferably is in the range of about 1.1 to 1.5. This ratio follows from the combination of the threaded portion (locking portion) with the non-threaded portion (compression portion), which requires a clamping path for the screw head. This ration of DL/DQ represents a preferred compromise between compression and plate weakening due to the presence of the hole.
According to another embodiment of the invention, the underside of the bone plate may be concave, thus allowing the plate to conform to the rounded cross-section of the tibia, femur, humerus, lower arm bone, and other bones with which the present invention may be used. The concave configuration of the underside also allows a conventional bone screw to be inserted obliquely through the plate hole. This feature may be especially important when gripping a small bone fragment, which must be pulled up to the plate.
The present invention is also directed to a bone plating system including at least one bone screw having a screw head with a thread disposed thereon, the thread being configured and dimensioned to engage the threaded portion of the above-described bone plate holes. Preferably, the bone screw is self-tapping and/or self-drilling.
FIELD OF THE INVENTION
The present invention relates generally to devices for fixation of parts of a fractured bone and more specifically, to bone plates and systems for stabilization and/or compression of parts of a fractured bone.
BACKGROUND OF THE INVENTION
Bone plates may generally be utilized to carry out two different types of osteosynthesis, namely "rigid osteosynthesis" and "flexible osteosynthesis."
Rigid osteosynthesis is used for medical care of joint fractures, simple shaft fractures (where nailing is impossible) as well as for osteotomies. Aside from the possibility of anatomical repositioning, the bone itself supports and stabilizes the osteosynthesis, which allows for the possibility of putting stress on the extremity earlier and without pain.
Additional advantages of the medical care of stable fractures can be observed when the blood circulation in the bone is greatly diminished due to trauma. For treating "nonunions" or in the case of existing infection, the fracture must be kept stable in order to make bone healing possible and so as not to irritate the infection further by instability of the fracture gap.
Flexible osteosynthesis, also known as "biological osteosynthesis," may be desirable in the medical treatment of comminuted fractures in the shaft region of tubular bones. In the case of these fractures, it is an objective to maintain the proper length of the bone and to fix the bone ends (joints) in their proper anatomic positions with respect to one another. With flexible osteosynthesis, the fracture zone is not directly affixed or manipulated, and consequently, the blood circulation in this area is not inhibited. Bone plates designed for flexible osteosynthesis thus operate similarly to a locking, intramedullary nail, which is anchored only in the metaphyses.
Since fractures cannot always be treated with one type of osteosynthesis, surgeons must frequently compromise because a bone plate, which allows him to combine the two types of osteosynthesis discussed above, is not available. Such a combination would be beneficial, for example, when a joint fracture can be compressed with traction screws through the bone plate and the whole of the joint may be connected to the diaphysis over an internal fixative with angularly stable screws. Another illustrative application concerns porotic bones, where a bone plate with axially and angularly stable screws can be anchored in the metaphysial fragment, with a stable plate-affixation being undertaken in the diaphyseal range with the assistance of a plate traction screw through the fracture. A
primary fracture stabilization can be achieved by this type of procedure.
This situation has led to the development and marketing of bone implants for both types of osteosynthesis. The two types of implant group, however, are designed specifically for their respective method. Thus, the disadvantages of these two systems lies in the difficulty in combining them.
Thus, a need exists for improved bone plates that provide for both rigid and flexible osteosynthesis.
SUMMARY OF THE INVENTION
The present invention is directed to a bone plate that is adapted to be used for both rigid and flexible osteosynthesis, without compromising the plates ability to be used for either type of osteosynthesis. Accordingly, the bone plate of the present invention may be used as a compression plate or as an internal fixative.
According to one embodiment of the invention, the bone plate includes an upper surface, a bone contacting surface, and a plurality of holes extending through the upper and bone contacting surfaces. At least one of the holes is elongated in a direction substantially aligned with a longitudinal axis of the plate, and includes a threaded portion and a non-threaded portion. The threaded portion may extend over a range of greater than about 180 with respect to a central axis of the hole. The threaded portion of the hole is dimensioned and configured to engage a threaded head of a bone screw, and fix the bone screw at a predetermined angle with respect to the bone plate. Preferably, the threaded portion extends through the full thickness of the bone plate, i.e., from the upper surface to the bone contacting surface, thus maximizing the stability of the bone screw to bone plate interface.
With the threaded screw head fixed in the threaded portion of the elongated hole, the bone plate may be used as an internal fixative. Use in this configuration, however, creates high stresses at the interface of the bone plate and screw head because the plate is not forced against the bone, and therefore, the bone fracture is fixed primarily by friction between the plate and the bone. This increase in stress is taken into account by the threaded portion of the hole extending over a range of at least about 180 with respect to a central axis of the hole, and thereby enclosing the screw head in at least this angular range.
This feature of the bone plate is especially advantageous where thin bone plates are involved. Preferably, the threaded portion is disposed on one of the two longitudinal ends of the hole. This positioning allows for the threaded portion to extend over a larger angular range. For example, the threaded portion may extend over a range of between about 190 and about 280 , and preferably over a range of between about 200 to 250 , thus maximizing the strength of the bone screw to bone plate interface.
According to another embodiment of the present invention, at least one of the holes may include a threaded portion that is angled or tapered with respect to a central axis of the hole. More specifically, the threaded portion may conically taper inward towards the bone-contacting surface of the bone plate. A bone screw to be rigidly fixed to the bone plate may include a threaded screw head that is tapered to substantially match the tapered shape of the threaded portion of the hole. Thus, the bone screw may be rigidly fixed to the bone plate by engagement between the matching conical threads.
This method of attachment is especially advantageous when self-drilling screws are to be used since, due to the conical shape of the matching threads, the screw may be inserted into the bone independently of the plate. More specifically, the screw head becomes rigidly clamped to the plate only as the threaded screw head penetrates the threaded portion of the hole.
Despite any initial misalignment between the threads on the screw head (the position of which are initially dictated by the orientation of the bone screw in the bone) and the threads on the bone plate, the conical shape of the mating threads ensures that the threads on the screw head will ultimately align with the threaded portion of the hole.
When the conical thread screw head is tightened into the threaded portion of the hole, the screw head creates radial forces in the plate hole. Thus, the bone plate must be dimensioned and configured to withstand these high radial forces, e.g., to withstand flexing of the walls of the screw holes in the bone plate.
The threaded portion preferably tapers at a cone angle of between about 5 and about 20 . Preferably, the thread tapers at a cone angle of about 10 .
In the case where the threaded portion of the hole is tapered, as discussed above, the threaded portion may extend through a different angle when measured at the upper surface than when measured at the bone-contacting surface. For example, when measured at the upper surface, the threaded portion may extend through a first angle of between about 200 and about 270 , while when measured at the bone-contacting surface, the threaded portion may extend through a second angle of between about 180 and about 230 .
According to another aspect of the present invention, at least one of the holes may be dimensioned and configured to receive a ball shaped head of a bone screw and provide for compression of two fractured bone fragments. For example, according to one embodiment, the non-threaded portion of the elongated hole, discussed above, may include a concave, substantially spherical recess at the upper surface. The recess may be dimensioned and configured to accommodate the spherical head of a conventional bone screw. Such an arrangement may be especially useful when the bone screw is put in place eccentrically with respect to the hole, as is necessary for attaining compression of a fracture. Additionally, the non-threaded portion of the hole may flare outward in the area of the bone contacting surface to provide for increased angulation of the bone screw with respect to the bone plate.
The threaded portion of the hole may be positioned closer to the end of the elongated hole that is closer to the center of the plate, thus avoiding any undesirable effects on the compression capability of the non-threaded portion. Thus, when the bone plate is used as a compression plate, the geometry of the non-threaded portion (compression portion) is not adversely affected by the presence of the threaded portion.
As discussed above, the hole may be elongated. Thus, the elongated hole may define first and second dimensions on the bone contacting surface, wherein the first dimension DL is substantially parallel to the longitudinal axis of the bone plate and the second dimension DQ is substantially perpendicular to the longitudinal axis.
The ratio of DL/DQ may be within the range of about 1.1 to 3, and preferably is in the range of about 1.1 to 1.5. This ratio follows from the combination of the threaded portion (locking portion) with the non-threaded portion (compression portion), which requires a clamping path for the screw head. This ration of DL/DQ represents a preferred compromise between compression and plate weakening due to the presence of the hole.
According to another embodiment of the invention, the underside of the bone plate may be concave, thus allowing the plate to conform to the rounded cross-section of the tibia, femur, humerus, lower arm bone, and other bones with which the present invention may be used. The concave configuration of the underside also allows a conventional bone screw to be inserted obliquely through the plate hole. This feature may be especially important when gripping a small bone fragment, which must be pulled up to the plate.
The present invention is also directed to a bone plating system including at least one bone screw having a screw head with a thread disposed thereon, the thread being configured and dimensioned to engage the threaded portion of the above-described bone plate holes. Preferably, the bone screw is self-tapping and/or self-drilling.
BRIEF DESCRIPTION OF THE DRAWINGS
To facilitate an understanding of the characteristics, structure and operation of the invention, preferred features of the invention are described in the accompanying discussion, wherein similar reference characters denote similar elements throughout the several views or embodiments, and wherein:
FIG. 1 is a top view of a segment of a bone plate according to one embodiment of the present invention;
FIG. 2 is a top view of a segment of a bone plate according to another embodiment of the present invention;
FIG. 3 is a longitudinal cross-sectional view showing a threaded hole of the bone plate of FIG. 1;
FIG. 4 is a longitudinal cross-sectional view of a partially-threaded, elongated hole of the bone plate of FIG. 2; and FIG. 5 is a perspective view of the segment of the bone plate of FIG. 2, with a bone screw inserted into the partially-threaded, elongated hole.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
One embodiment of a bone plate according to the present invention is shown in FIG. 1. The bone plate includes an upper surface 1, a bone-contacting surface 2, and defines a longitudinal axis 3. The bone plate further includes two holes 4A and 4B, which are generally located along the longitudinal axis 3, and extend through the bone plate from upper surface 1 to bone-contacting surface 2. Holes 4A and 4B are dimensioned and configured to receive the heads of bone screws. As shown in FIG. 1, arrow 7 indicates a longitudinal direction toward one end of the bone plate and arrow 8 indicates a longitudinal direction toward a central portion of the bone plate.
Still referring to FIG. 1, hole 4A, which is located closer to the central portion of the bone plate, is elongated along the longitudinal axis 3 of the bone plate.
More specifically, hole 4A defines first and second dimensions on bone-contacting surface 2. First dimension DL is substantially parallel to longitudinal axis 3, and second dimension DQ is substantially perpendicular to longitudinal axis 3. First dimension DL
is preferably larger than second dimension DQ. According to one preferred embodiment, DL is 5.2 mm and DQ is 3 mm, however other dimensions are possible. Elongated hole 4A may be provided with a concave and preferably spherical recess 6 near upper surface 1. Recess 6 may be dimensioned to receive a bone screw having a substantially spherical-shaped head.
Hole 4B, which is located closer to one end of the bone plate, includes a thread 5 which extends through an angle of 360 around the hole 4B. As shown in the schematical representation of FIG. 1, hole 4B assumes the shape of a cone tapering inward in a direction toward bone contacting surface 2, and accordingly thread 5 also tapers inward toward bone contacting surface 2. As shown in FIG. 3, hole 4B and thread 5 preferably taper inward with respect to central axis 20 of hole 4B by a cone angle 22 of about 10 , however other value of cone angle 22 are possible. In addition, thread 5 is preferably a double thread. As shown in FIG. 3, thread 5 of hole 4B may run along the full thickness of the bone plate from the upper surface 1 to the bone-contacting surface 2.
In one preferred embodiment of the invention shown in FIGS. 2 and 4, the two bone-plate holes 4A and 4B of FIG. 1 may be combined to form a combination hole 4C. The combination hole 4C is thus provided with a threaded portion which includes a thread 5, and a non-threaded portion which has no threads disposed thereon.
The threaded portion is preferably located at the end of the hole 4C which is nearer to the central portion of the bone plate.
With reference to FIG. 2, when measured at upper surface 1, the threaded portion (thread 5) extends over a first angle 9 with respect to the central axis of hole 4C, and when measured at bone-contacting surface 2, the threaded portion (thread 5) extends over a second angle 10 with respect to the central axis. Preferably, first angle 9 is about 223 and second angle 10 is about 256 , however other values of first and second angles 9, 10 are possible.
The table below displays, for illustrative purposes only, preferred parameters which may be used depending on the diameter of thread 5.
Thread Diameter 3.0 mm 4.0 mm 5.0 mm Double Thread yes yes yes Thread Pitch 0.7 mm 0.9 mm 1.0 mm Thread Depth (measured as'h of outside/inside 0.2025 mm 0.2575 mm 0.2810 mm diameter-d ifferential ) Angular Range (at upper surface) 200 200 190 Angular Range (at bone-contacting surface) 260 240 250 Shape of Threaded Portion Conical Conical Conical Referring to FIG. 5, combination hole 4C is shown with a bone screw 11 received therein. The bone screw preferably has a screw head 13 with a thread disposed thereon. As shown in FIG. 5, thread 12 may substantially match thread 5 of combination hole 4C. Preferably, bone screw 11 is self-drilling and/or self-tapping.
While preferred embodiments and features of the present invention have been disclosed herein, it will be appreciated that numerous modifications and embodiments may be devised by those skilled in the art. It is intended that the appended claims cover all such modifications and embodiments as fall within the true spirit and scope of such claims and that the claims not be limited to or by such preferred embodiments or features.
To facilitate an understanding of the characteristics, structure and operation of the invention, preferred features of the invention are described in the accompanying discussion, wherein similar reference characters denote similar elements throughout the several views or embodiments, and wherein:
FIG. 1 is a top view of a segment of a bone plate according to one embodiment of the present invention;
FIG. 2 is a top view of a segment of a bone plate according to another embodiment of the present invention;
FIG. 3 is a longitudinal cross-sectional view showing a threaded hole of the bone plate of FIG. 1;
FIG. 4 is a longitudinal cross-sectional view of a partially-threaded, elongated hole of the bone plate of FIG. 2; and FIG. 5 is a perspective view of the segment of the bone plate of FIG. 2, with a bone screw inserted into the partially-threaded, elongated hole.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
One embodiment of a bone plate according to the present invention is shown in FIG. 1. The bone plate includes an upper surface 1, a bone-contacting surface 2, and defines a longitudinal axis 3. The bone plate further includes two holes 4A and 4B, which are generally located along the longitudinal axis 3, and extend through the bone plate from upper surface 1 to bone-contacting surface 2. Holes 4A and 4B are dimensioned and configured to receive the heads of bone screws. As shown in FIG. 1, arrow 7 indicates a longitudinal direction toward one end of the bone plate and arrow 8 indicates a longitudinal direction toward a central portion of the bone plate.
Still referring to FIG. 1, hole 4A, which is located closer to the central portion of the bone plate, is elongated along the longitudinal axis 3 of the bone plate.
More specifically, hole 4A defines first and second dimensions on bone-contacting surface 2. First dimension DL is substantially parallel to longitudinal axis 3, and second dimension DQ is substantially perpendicular to longitudinal axis 3. First dimension DL
is preferably larger than second dimension DQ. According to one preferred embodiment, DL is 5.2 mm and DQ is 3 mm, however other dimensions are possible. Elongated hole 4A may be provided with a concave and preferably spherical recess 6 near upper surface 1. Recess 6 may be dimensioned to receive a bone screw having a substantially spherical-shaped head.
Hole 4B, which is located closer to one end of the bone plate, includes a thread 5 which extends through an angle of 360 around the hole 4B. As shown in the schematical representation of FIG. 1, hole 4B assumes the shape of a cone tapering inward in a direction toward bone contacting surface 2, and accordingly thread 5 also tapers inward toward bone contacting surface 2. As shown in FIG. 3, hole 4B and thread 5 preferably taper inward with respect to central axis 20 of hole 4B by a cone angle 22 of about 10 , however other value of cone angle 22 are possible. In addition, thread 5 is preferably a double thread. As shown in FIG. 3, thread 5 of hole 4B may run along the full thickness of the bone plate from the upper surface 1 to the bone-contacting surface 2.
In one preferred embodiment of the invention shown in FIGS. 2 and 4, the two bone-plate holes 4A and 4B of FIG. 1 may be combined to form a combination hole 4C. The combination hole 4C is thus provided with a threaded portion which includes a thread 5, and a non-threaded portion which has no threads disposed thereon.
The threaded portion is preferably located at the end of the hole 4C which is nearer to the central portion of the bone plate.
With reference to FIG. 2, when measured at upper surface 1, the threaded portion (thread 5) extends over a first angle 9 with respect to the central axis of hole 4C, and when measured at bone-contacting surface 2, the threaded portion (thread 5) extends over a second angle 10 with respect to the central axis. Preferably, first angle 9 is about 223 and second angle 10 is about 256 , however other values of first and second angles 9, 10 are possible.
The table below displays, for illustrative purposes only, preferred parameters which may be used depending on the diameter of thread 5.
Thread Diameter 3.0 mm 4.0 mm 5.0 mm Double Thread yes yes yes Thread Pitch 0.7 mm 0.9 mm 1.0 mm Thread Depth (measured as'h of outside/inside 0.2025 mm 0.2575 mm 0.2810 mm diameter-d ifferential ) Angular Range (at upper surface) 200 200 190 Angular Range (at bone-contacting surface) 260 240 250 Shape of Threaded Portion Conical Conical Conical Referring to FIG. 5, combination hole 4C is shown with a bone screw 11 received therein. The bone screw preferably has a screw head 13 with a thread disposed thereon. As shown in FIG. 5, thread 12 may substantially match thread 5 of combination hole 4C. Preferably, bone screw 11 is self-drilling and/or self-tapping.
While preferred embodiments and features of the present invention have been disclosed herein, it will be appreciated that numerous modifications and embodiments may be devised by those skilled in the art. It is intended that the appended claims cover all such modifications and embodiments as fall within the true spirit and scope of such claims and that the claims not be limited to or by such preferred embodiments or features.
Claims (52)
1. A bone plate having a longitudinal plate axis and comprising:
an upper surface;
a lower surface;
at least one first type of hole, the first type of hole being elongated and extending through the upper and lower surfaces, and having a central axis and a longitudinal hole axis, wherein the first type of hole includes a threaded portion and a non-threaded portion, and the threaded portion extends through an angle of between about 190° and about 280° with respect to the central axis; and at least a second type of hole extending through the upper and lower surfaces, the second type of hole including an internal thread configured and dimensioned for engaging a threaded portion of a screw head.
an upper surface;
a lower surface;
at least one first type of hole, the first type of hole being elongated and extending through the upper and lower surfaces, and having a central axis and a longitudinal hole axis, wherein the first type of hole includes a threaded portion and a non-threaded portion, and the threaded portion extends through an angle of between about 190° and about 280° with respect to the central axis; and at least a second type of hole extending through the upper and lower surfaces, the second type of hole including an internal thread configured and dimensioned for engaging a threaded portion of a screw head.
2. The bone plate of claim 1, wherein the plate comprises a plurality of holes of the first type and a plurality of holes of the second type.
3. The bone plate of claim 2, wherein the plurality of holes of the first type are located closer to a first end of the plate and the plurality of holes of the second type are located closer to a second end of the plate.
4. The bone plate of claim 1, wherein the longitudinal hole axis of at least one first type of hole is substantially aligned with the longitudinal plate axis.
5. The bone plate of claim 1, wherein the second type of hole has an outer perimeter that is substantially circular.
6. The bone plate of claim 5, wherein the second type of hole is conically tapered inward from the upper surface towards the lower surface of the plate.
7. The bone plate of claim 6, wherein the second type of hole conically tapers at a cone angle of between about 5° and about 20°.
8. The bone plate of claim 6, further comprising at least a third type of hole extending through the upper and lower surfaces, wherein the third type of hole is substantially non-threaded.
9. The bone plate of claim 8, wherein a plurality of holes of the first type and at least one hole of the second type or third type are located closer to a first end of the plate and a plurality of holes of at least the second type are located closer to a second end of the plate.
10. The bone plate of claim 5, wherein the second type of hole has a first opening on the upper surface of the bone plate and a second opening on the bottom surface of the bone plate, and the first and second openings have substantially the same dimensions.
11. The bone plate of claim 10, further comprising at least a third type of hole extending through the upper and lower surfaces, wherein the third type of hole is substantially non-threaded.
12. The bone plate of claim 11, wherein a plurality of holes of the first type and at least one hole of the second type or third type are located closer to a first end of the plate and a plurality of holes of at least the second type are located closer to a second end of the plate.
13. The bone plate of claim 1, wherein the threaded portion of the first type of hole extends through an angle of between about 200° and about 250° with respect to the central axis.
14. The bone plate of claim 1, wherein:
the threaded portion of the first type of hole extends through a first angle at the upper surface;
the threaded portion of the first type of hole extends through a second angle at the lower surface; and the first angle is larger than the second angle.
the threaded portion of the first type of hole extends through a first angle at the upper surface;
the threaded portion of the first type of hole extends through a second angle at the lower surface; and the first angle is larger than the second angle.
15. The bone plate of claim 14, wherein the first angle is between about 200° and about 270°, and the second angle is between about 180° and about 230°.
16. The bone plate of claim 1, wherein the first type of hole has first and second ends spaced apart along the longitudinal hole axis, and the threaded portion is disposed adjacent one of the ends.
17. The bone plate of claim 1, wherein the threaded portion of the first type of hole is located closer to a central portion of the bone plate than to an end portion of the bone plate.
18. The bone plate of claim 1, wherein the non-threaded portion of the first type of hole is configured and dimensioned to engage a substantially spherical screw head and provide compression of fractured bone fragments.
19. The bone plate of claim 18, further including a screw having a head, wherein the screw head is substantially smooth.
20. The bone plate of claim 18, further including a screw having a head, wherein the screw head is at least partially threaded.
21. The bone plate of claim 1, wherein the non-threaded portion of the first type of hole includes a concave recessed portion in the upper surface.
22. The bone plate of claim 21, wherein the recessed portion is substantially spherical.
23. The bone plate of claim 1, wherein:
the first type of hole has a first dimension on the lower surface that is substantially parallel to the longitudinal hole axis;
the first type of hole has a second dimension on the lower surface that is substantially perpendicular to the longitudinal hole axis; and the first dimension is between 1.1 and 3 times larger than the second dimension.
the first type of hole has a first dimension on the lower surface that is substantially parallel to the longitudinal hole axis;
the first type of hole has a second dimension on the lower surface that is substantially perpendicular to the longitudinal hole axis; and the first dimension is between 1.1 and 3 times larger than the second dimension.
24. The bone plate of claim 1, wherein the threaded portion of the first type of hole tapers inward in a direction from the upper surface towards the lower surface.
25. The bone plate of claim 1, wherein at least a portion of the non-threaded portion of the first type of hole tapers inward from the upper surface to the lower surface to form at least one ramp surface for engagement with a screw head.
26. The bone plate of claim 25, wherein the ramp surface is located on one end of the first type of hole to provide compression in a single direction.
27. A bone plate having a longitudinal plate axis and comprising:
an upper surface;
a lower surface;
at least one first type of hole, the first type of hole being elongated and extending through the upper and lower surfaces, and having a central axis and a longitudinal hole axis, wherein the first type of hole includes a threaded portion and a non-threaded portion, and the threaded portion extends through an angle of between about 190° and about 280° with respect to the central axis; and at least a second type of hole extending through the upper and lower surfaces, wherein the second type of hole is substantially non-threaded.
an upper surface;
a lower surface;
at least one first type of hole, the first type of hole being elongated and extending through the upper and lower surfaces, and having a central axis and a longitudinal hole axis, wherein the first type of hole includes a threaded portion and a non-threaded portion, and the threaded portion extends through an angle of between about 190° and about 280° with respect to the central axis; and at least a second type of hole extending through the upper and lower surfaces, wherein the second type of hole is substantially non-threaded.
28. The bone plate of claim 27, wherein the plate comprises a plurality of holes of the first type and a plurality of holes of the second type.
29. The bone plate of claim 28, wherein the plurality of holes of the first type are located closer to a first end of the plate and the plurality of holes of the second type are located closer to a second end of the plate.
30. The bone plate of claim 27, wherein the longitudinal hole axis of at least one first type of hole is substantially aligned with the longitudinal plate axis.
31. The bone plate of claim 27, wherein the second type of hole has an outer perimeter that is substantially circular.
32. The bone plate of claim 31, wherein the second type of hole is conically tapered inward from the upper surface towards the lower surface of the plate.
33. The bone plate of claim 32, wherein the second type of hole conically tapers at a cone angle of between about 5° and about 20°.
34. The bone plate of claim 32, further comprising at least a third type of hole extending through the upper and lower surfaces, wherein the third type of hole includes an internal thread configured and dimensioned for engaging a threaded portion of a screw head.
35. The bone plate of claim 34, wherein a plurality of holes of the first type and at least one hole of the second type or third type are located closer to a first end of the plate and a plurality of holes of at least the third type are located closer to a second end of the plate.
36. The bone plate of claim 31, wherein the second type of hole has a first opening on the upper surface of the bone plate and a second opening on the bottom surface of the bone plate, and the first and second openings have substantially the same dimensions.
37. The bone plate of claim 36, further comprising at least a third type of hole extending through the upper and lower surfaces, wherein the third type of hole includes an internal thread configured and dimensioned for engaging a threaded portion of a screw head.
38. The bone plate of claim 37, wherein a plurality of holes of the first type and at least one hole of the second type or third type are located closer to a first end of the plate and a plurality of holes of at least the third type are located closer to a second end of the plate.
39. The bone plate of claim 27, wherein the threaded portion of the first type of hole extends through an angle of between about 200° and about 250° with respect to the central axis.
40. The bone plate of claim 27, wherein:
the threaded portion of the first type of hole extends through a first angle at the upper surface;
the threaded portion of the first type of hole extends through a second angle at the lower surface; and the first angle is larger than the second angle.
the threaded portion of the first type of hole extends through a first angle at the upper surface;
the threaded portion of the first type of hole extends through a second angle at the lower surface; and the first angle is larger than the second angle.
41. The bone plate of claim 40, wherein the first angle is between about 200° and about 270°, and the second angle is between about 180° and about 230°.
42. The bone plate of claim 27, wherein the first type of hole has first and second ends spaced apart along the longitudinal hole axis, and the threaded portion is disposed adjacent one of the ends.
43. The bone plate of claim 27, wherein the threaded portion of the first type of hole is located closer to a central portion of the bone plate than to an end portion of the bone plate.
44. The bone plate of claim 27, wherein the non-threaded portion of the first type of hole is configured and dimensioned to engage a substantially spherical screw head and provide compression of fractured bone fragments.
45. The bone plate of claim 44, further including a screw having a head, wherein the screw head is substantially smooth.
46. The bone plate of claim 44, further including a screw having a head, wherein the screw head is at least partially threaded.
47. The bone plate of claim 27, wherein the non-threaded portion of the first type of hole includes a concave recessed portion in the upper surface.
48. The bone plate of claim 47, wherein the recessed portion is substantially spherical.
49. The bone plate of claim 27, wherein:
the first type of hole has a first dimension on the lower surface that is substantially parallel to the longitudinal hole axis;
the first type of hole has a second dimension on the lower surface that is substantially perpendicular to the longitudinal hole axis; and the first dimension is between 1.1 and 3 times larger than the second dimension.
the first type of hole has a first dimension on the lower surface that is substantially parallel to the longitudinal hole axis;
the first type of hole has a second dimension on the lower surface that is substantially perpendicular to the longitudinal hole axis; and the first dimension is between 1.1 and 3 times larger than the second dimension.
50. The bone plate of claim 27, wherein the threaded portion of the first type of hole tapers inward in a direction from the upper surface towards the lower surface.
51. The bone plate of claim 27, wherein at least a portion of the non-threaded portion of the first type of hole tapers inward from the upper surface to the lower surface to form at least one ramp surface for engagement with a screw head.
52. The bone plate of claim 51, wherein the ramp surface is located on one end of the first type of hole to provide compression in a single direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2626694A CA2626694C (en) | 1999-03-09 | 1999-03-09 | Bone plate with conical screw threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CH1999/000107 WO2000053111A1 (en) | 1999-03-09 | 1999-03-09 | Bone plate with conical screw threads |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2626694A Division CA2626694C (en) | 1999-03-09 | 1999-03-09 | Bone plate with conical screw threads |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2367088A1 CA2367088A1 (en) | 2000-09-14 |
| CA2367088C true CA2367088C (en) | 2008-07-15 |
Family
ID=4551663
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002367088A Expired - Lifetime CA2367088C (en) | 1999-03-09 | 1999-03-09 | Bone plate with conical screw threads |
| CA2626694A Expired - Lifetime CA2626694C (en) | 1999-03-09 | 1999-03-09 | Bone plate with conical screw threads |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2626694A Expired - Lifetime CA2626694C (en) | 1999-03-09 | 1999-03-09 | Bone plate with conical screw threads |
Country Status (17)
| Country | Link |
|---|---|
| EP (1) | EP1158916B1 (en) |
| JP (1) | JP4276386B2 (en) |
| KR (1) | KR100604451B1 (en) |
| CN (1) | CN1149057C (en) |
| AT (1) | ATE270526T1 (en) |
| AU (1) | AU756798B2 (en) |
| CA (2) | CA2367088C (en) |
| DE (1) | DE59909921D1 (en) |
| DK (1) | DK1158916T3 (en) |
| ES (1) | ES2223163T3 (en) |
| HK (1) | HK1039266B (en) |
| MY (1) | MY125262A (en) |
| NZ (1) | NZ513747A (en) |
| PT (1) | PT1158916E (en) |
| TW (1) | TW580379B (en) |
| WO (1) | WO2000053111A1 (en) |
| ZA (1) | ZA200001217B (en) |
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-
1999
- 1999-03-09 CA CA002367088A patent/CA2367088C/en not_active Expired - Lifetime
- 1999-03-09 EP EP99906010A patent/EP1158916B1/en not_active Expired - Lifetime
- 1999-03-09 CA CA2626694A patent/CA2626694C/en not_active Expired - Lifetime
- 1999-03-09 DE DE59909921T patent/DE59909921D1/en not_active Expired - Lifetime
- 1999-03-09 WO PCT/CH1999/000107 patent/WO2000053111A1/en active IP Right Grant
- 1999-03-09 CN CNB99816450XA patent/CN1149057C/en not_active Expired - Lifetime
- 1999-03-09 ES ES99906010T patent/ES2223163T3/en not_active Expired - Lifetime
- 1999-03-09 JP JP2000603602A patent/JP4276386B2/en not_active Expired - Lifetime
- 1999-03-09 KR KR1020017011363A patent/KR100604451B1/en not_active IP Right Cessation
- 1999-03-09 AT AT99906010T patent/ATE270526T1/en not_active IP Right Cessation
- 1999-03-09 PT PT99906010T patent/PT1158916E/en unknown
- 1999-03-09 NZ NZ513747A patent/NZ513747A/en unknown
- 1999-03-09 AU AU26072/99A patent/AU756798B2/en not_active Ceased
- 1999-03-09 DK DK99906010T patent/DK1158916T3/en active
-
2000
- 2000-03-07 TW TW089104040A patent/TW580379B/en not_active IP Right Cessation
- 2000-03-09 ZA ZA200001217A patent/ZA200001217B/en unknown
- 2000-03-09 MY MYPI20000909A patent/MY125262A/en unknown
-
2002
- 2002-02-04 HK HK02100839.3A patent/HK1039266B/en not_active IP Right Cessation
Also Published As
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| KR100604451B1 (en) | 2006-07-26 |
| TW580379B (en) | 2004-03-21 |
| CN1149057C (en) | 2004-05-12 |
| ES2223163T3 (en) | 2005-02-16 |
| JP2003516167A (en) | 2003-05-13 |
| AU2607299A (en) | 2000-09-28 |
| ZA200001217B (en) | 2000-09-26 |
| EP1158916A1 (en) | 2001-12-05 |
| CA2626694C (en) | 2011-08-02 |
| EP1158916B1 (en) | 2004-07-07 |
| DK1158916T3 (en) | 2004-10-04 |
| HK1039266A1 (en) | 2002-04-19 |
| DE59909921D1 (en) | 2004-08-12 |
| CN1337864A (en) | 2002-02-27 |
| JP4276386B2 (en) | 2009-06-10 |
| NZ513747A (en) | 2002-12-20 |
| PT1158916E (en) | 2004-11-30 |
| AU756798B2 (en) | 2003-01-23 |
| CA2626694A1 (en) | 2000-09-14 |
| MY125262A (en) | 2006-07-31 |
| ATE270526T1 (en) | 2004-07-15 |
| CA2367088A1 (en) | 2000-09-14 |
| KR20010108322A (en) | 2001-12-07 |
| HK1039266B (en) | 2004-12-03 |
| WO2000053111A1 (en) | 2000-09-14 |
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