CA2448522C - Bone plate for the fixation of fractures of the proximal humerus - Google Patents
Bone plate for the fixation of fractures of the proximal humerus Download PDFInfo
- Publication number
- CA2448522C CA2448522C CA2448522A CA2448522A CA2448522C CA 2448522 C CA2448522 C CA 2448522C CA 2448522 A CA2448522 A CA 2448522A CA 2448522 A CA2448522 A CA 2448522A CA 2448522 C CA2448522 C CA 2448522C
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- Canada
- Prior art keywords
- bone plate
- shaft portion
- longitudinal axis
- bone
- screw holes
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Classifications
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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
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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
- A61B17/8061—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones
-
- 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
Abstract
The invention relates to a bone plate, which is used for the fixation of fractures of the proximal humerus. Said plate comprises a peduncular part (1), whose length is greater than its width x and a spoon-shaped part (2), whose width y is greater than the width x of the peduncular part (1). The peduncular part (1) and the spoon-shaped part (2) have a common longitudinal central axis (3) and are interconnected by a transition zone (26). At least 2 screw holes (9, 10, 16, 17; 24) are configured in the peduncular part (1) and the spoon-shaped part (2) respectively. At least one of the screw holes (24) in the peduncular part (1) has an at least partial internal thread (28) or partially spiralling key beds. At least one of the screw holes (9, 10, 16, 17) in the spoon-shaped part (2) has an internal thread (27) or partially spiralling key beds. The lead of the internal thread (27; 28) or the partially spiralling key beds ranges between 0.5 mm and 1.1 mm.
Description
Bone Plate For The Fixation Of Fractures Of The Proximal Humerus The invention relates to a bone plate for fixation of proximal humerus fractures.
These bone plates are used for fixation of all types of fractures on the proximal humerus, but especially for all three-part and four-part fractures and for dislocated fractures on the proximal humerus.
A frequent cause of fractures of the proximal humerus in recent years has been high energy trauma. This type of fracture increases with age since in the area of the proximal humerus the bone structure is very degraded so that only in the edge zone of the bone is there intact bone structure. In a fall on an outstretched arm at advanced age the bone then breaks preferably at this point.
A generic bone plate is already known from US-A 6,096,040 ESSER.
The disadvantages of this arrangement consist in that the plate in a spoon-like part has a hole position with which it is not possible to grip good bone structure in the edge zone of the proximal humerus, as is well known.
Moreover, the implant which is described in ESSER is a plate without angularly stable options in the plate holes. When using the plate it is pressed by bone screws against the bone. This process is called compression osteosynthesis. In doing so the forces which occur are transferred via friction between the implant and the bone, while the bone must bear most of the load. The great axial pressure to which the bone screws are exposed for relative stable retention of the plate on the bone under dynamic conditions causes the bone screws to tear out of the bone, and associated with this, a loss of the stability of the plate-bone construct.
The discussion of the prior art above serves only to explain the environment of the invention and does not mean that the cited art at the time of this application or its priority had in fact been published or was publicly known.
The invention is intended as a remedy here. The object of the invention is to devise a bone plate for fixation of proximal humerus fractures with which angularly stable osteosynthesis can be achieved. Important advantages of the invention are the angular stability of the screw holes in combination with screws with head threads, simple handling, optimum anatomic matching to the bone and no impediment to the relevant anatomic structures of the proximal humerus. By using screws with a threaded head an angularly stable bone construct is formed which can maintain the hold even under dynamic conditions.
This object is achieved with a bone plate having a handle-shaped part (1), whose length is greater than its width x, and a spoon-shaped part (2), whose width y is greater than width x of the handle-shaped part (1), with the handle-shaped part (1) and the spoon-shaped part (2) having a common longitudinal axis (3) and being connected with one another via a transition area (26), and at least 2 screw holes (9,10,16,17,24) each being disposed in the handle-shaped part (1) and in the spoon-shaped part (2), characterized in that: A) at least one of the screw holes (24) in the handle-shaped part (1) has an at least partial inside thread (28) or partially circumferential grooves; B) at least one of the screw holes (9,10,16,17) in the spoon-shaped part (2) has an inside thread (27) or partially circumferential grooves; C) the pitch of the inside threads (27,28) or the partially circumferential grooves lies in the range between 0.5 mm and 1.1 mm; and D) the thickness (7) of the bone plate is in the range between 1.7 and 2.3 mm.
The small thread pitch allows secure anchoring of the screw in the plate on a very short section, conventionally in the range from 1 to 2 mm. In this way the thickness of the plate can be made very thin without adversely affecting the stability of the plate-screw construct.
One preferred development consists in that the pitch of the inside thread or the partially peripheral wedge-shaped grooves is in the range from 0.7 to 0.9 mm; this further optimizes the described effect.
In another preferred embodiment the transition area widens from the width x of the handle-shaped part to the width y of the spoon-shaped part, preferably exponentially.
Thus, optimum matching to the unbroken human proximal humerus can be achieved.
The plate thus rests cleanly on the bone and none of the relevant anatomic structures are impeded.
The thickness of the plate is preferably in the range from 1.7 to 2.3 mm, preferably between 1.9 to 2.1 mm. The advantage of the thickness which is comparatively low compared to conventional bone plates is mainly that thin plates do not impede the relevant structures and when the arm is lifted do not hit the acromion of the shoulder.
Preferably the handle-shaped part of the plate, viewed in the direction of the central axis, is made curved in at least one component area.
In another preferred embodiment the handle-shaped part of the plate, viewed in the direction of the central axis (3), is curved at least in one component area in the form of an elliptical arc (21).
The length of the major axis (22) of the ellipse which belongs to the elliptical arc (21) is preferably in the range between 150 and 170 nun, typically in the range from 157 to 163 mm. The length of the minor axis of the ellipse which belongs to the elliptical arc is preferably in the range between 60 and 80 mm, typically in the range between 67 and 73 mm.
The free end of the handle-shaped part and of the spoon-shaped part (2) are preferably essentially in planes which are parallel to one another.
All these preferred measures have the advantage that improved matching to the unbroken human proximal humerus is possible, the plate resting cleanly on the bone, and none of the relevant anatomic structures being impeded.
In another preferred embodiment the bone plate at least in one component area has a curvature which runs transversely to the central axis, preferably with a radius of curvature in the range from 18 to 22 mm.
In another embodiment the bone plate has a curvature which runs transversely to the central axis over its entire length. The advantage which can be attained with it is that no irritation of the soft parts which are present occurs. When the arm is raised the bone plate is prevented from hitting the acromion of the shoulder.
In another preferred embodiment the free end portion of the spoon-shaped part has two holes which are located symmetrically to the central axis, with parallel hole axes, the hole axes forming an angle from 92 to 98 , preferably from 94 to 96 , with the surface which has been formed by the spoon-shaped part. In order to achieve angularly-stable repositioning, in implants from the prior art blades are necessary which are replaced by the screws which are to be inserted into the angularly-stable holes. The surgical technique of blades however requires greater time expenditure and is more complex to use than that with angularly-stable screws as in the invention. The contact angle of roughly 95 increases the contact surface with the solid bone since solid bone material is present only in the edge zones of the relatively hollow humerus head.
In another preferred embodiment the portion of the spoon-shaped part bordering the transition area has two holes which are arranged asymmetrically to the central axis and the axes of the two holes lie in planes which are parallel to one another and which are preferably orthogonal to the central axis. The projection of the one hole axis into the parallel plane which contains the other hole axis includes with the axis of the hole an angle of 40 - 60 , preferably 46 - 54 among one another.
These bone plates are used for fixation of all types of fractures on the proximal humerus, but especially for all three-part and four-part fractures and for dislocated fractures on the proximal humerus.
A frequent cause of fractures of the proximal humerus in recent years has been high energy trauma. This type of fracture increases with age since in the area of the proximal humerus the bone structure is very degraded so that only in the edge zone of the bone is there intact bone structure. In a fall on an outstretched arm at advanced age the bone then breaks preferably at this point.
A generic bone plate is already known from US-A 6,096,040 ESSER.
The disadvantages of this arrangement consist in that the plate in a spoon-like part has a hole position with which it is not possible to grip good bone structure in the edge zone of the proximal humerus, as is well known.
Moreover, the implant which is described in ESSER is a plate without angularly stable options in the plate holes. When using the plate it is pressed by bone screws against the bone. This process is called compression osteosynthesis. In doing so the forces which occur are transferred via friction between the implant and the bone, while the bone must bear most of the load. The great axial pressure to which the bone screws are exposed for relative stable retention of the plate on the bone under dynamic conditions causes the bone screws to tear out of the bone, and associated with this, a loss of the stability of the plate-bone construct.
The discussion of the prior art above serves only to explain the environment of the invention and does not mean that the cited art at the time of this application or its priority had in fact been published or was publicly known.
The invention is intended as a remedy here. The object of the invention is to devise a bone plate for fixation of proximal humerus fractures with which angularly stable osteosynthesis can be achieved. Important advantages of the invention are the angular stability of the screw holes in combination with screws with head threads, simple handling, optimum anatomic matching to the bone and no impediment to the relevant anatomic structures of the proximal humerus. By using screws with a threaded head an angularly stable bone construct is formed which can maintain the hold even under dynamic conditions.
This object is achieved with a bone plate having a handle-shaped part (1), whose length is greater than its width x, and a spoon-shaped part (2), whose width y is greater than width x of the handle-shaped part (1), with the handle-shaped part (1) and the spoon-shaped part (2) having a common longitudinal axis (3) and being connected with one another via a transition area (26), and at least 2 screw holes (9,10,16,17,24) each being disposed in the handle-shaped part (1) and in the spoon-shaped part (2), characterized in that: A) at least one of the screw holes (24) in the handle-shaped part (1) has an at least partial inside thread (28) or partially circumferential grooves; B) at least one of the screw holes (9,10,16,17) in the spoon-shaped part (2) has an inside thread (27) or partially circumferential grooves; C) the pitch of the inside threads (27,28) or the partially circumferential grooves lies in the range between 0.5 mm and 1.1 mm; and D) the thickness (7) of the bone plate is in the range between 1.7 and 2.3 mm.
The small thread pitch allows secure anchoring of the screw in the plate on a very short section, conventionally in the range from 1 to 2 mm. In this way the thickness of the plate can be made very thin without adversely affecting the stability of the plate-screw construct.
One preferred development consists in that the pitch of the inside thread or the partially peripheral wedge-shaped grooves is in the range from 0.7 to 0.9 mm; this further optimizes the described effect.
In another preferred embodiment the transition area widens from the width x of the handle-shaped part to the width y of the spoon-shaped part, preferably exponentially.
Thus, optimum matching to the unbroken human proximal humerus can be achieved.
The plate thus rests cleanly on the bone and none of the relevant anatomic structures are impeded.
The thickness of the plate is preferably in the range from 1.7 to 2.3 mm, preferably between 1.9 to 2.1 mm. The advantage of the thickness which is comparatively low compared to conventional bone plates is mainly that thin plates do not impede the relevant structures and when the arm is lifted do not hit the acromion of the shoulder.
Preferably the handle-shaped part of the plate, viewed in the direction of the central axis, is made curved in at least one component area.
In another preferred embodiment the handle-shaped part of the plate, viewed in the direction of the central axis (3), is curved at least in one component area in the form of an elliptical arc (21).
The length of the major axis (22) of the ellipse which belongs to the elliptical arc (21) is preferably in the range between 150 and 170 nun, typically in the range from 157 to 163 mm. The length of the minor axis of the ellipse which belongs to the elliptical arc is preferably in the range between 60 and 80 mm, typically in the range between 67 and 73 mm.
The free end of the handle-shaped part and of the spoon-shaped part (2) are preferably essentially in planes which are parallel to one another.
All these preferred measures have the advantage that improved matching to the unbroken human proximal humerus is possible, the plate resting cleanly on the bone, and none of the relevant anatomic structures being impeded.
In another preferred embodiment the bone plate at least in one component area has a curvature which runs transversely to the central axis, preferably with a radius of curvature in the range from 18 to 22 mm.
In another embodiment the bone plate has a curvature which runs transversely to the central axis over its entire length. The advantage which can be attained with it is that no irritation of the soft parts which are present occurs. When the arm is raised the bone plate is prevented from hitting the acromion of the shoulder.
In another preferred embodiment the free end portion of the spoon-shaped part has two holes which are located symmetrically to the central axis, with parallel hole axes, the hole axes forming an angle from 92 to 98 , preferably from 94 to 96 , with the surface which has been formed by the spoon-shaped part. In order to achieve angularly-stable repositioning, in implants from the prior art blades are necessary which are replaced by the screws which are to be inserted into the angularly-stable holes. The surgical technique of blades however requires greater time expenditure and is more complex to use than that with angularly-stable screws as in the invention. The contact angle of roughly 95 increases the contact surface with the solid bone since solid bone material is present only in the edge zones of the relatively hollow humerus head.
In another preferred embodiment the portion of the spoon-shaped part bordering the transition area has two holes which are arranged asymmetrically to the central axis and the axes of the two holes lie in planes which are parallel to one another and which are preferably orthogonal to the central axis. The projection of the one hole axis into the parallel plane which contains the other hole axis includes with the axis of the hole an angle of 40 - 60 , preferably 46 - 54 among one another.
The advantage of this means lies in that the screws which are to be inserted into these crossing holes allows the small tuberculum which often breaks in fractures of the proximal humerus to be used.
Another preferred embodiment is that at least one of the holes which are arranged symmetrically and/or asymmetrically to the central axis has an inside thread or partially peripheral wedge-shaped grooves. Here advantageously none of the axes of the holes which are arranged symmetrically and/or asymmetrically to the central axis intersect. In this way the advantage is achieved that the screws which are to be inserted into the holes do not mutually impede one another.
In another embodiment the axes of the holes which are made in the handle-shaped part are perpendicular thereto.
The inside threads are preferably multithreaded, typically double-threaded.
The bone plate as claimed in the invention can be used both for the left and also for the right humerus and is optimally matched to the shape of the healthy proximal humerus.
The invention and development of the invention are detailed below using a partial schematic of one embodiment.
Figure 1 shows an overhead view of the bone plate as claimed in the invention;
Figure 2 shows a section along the line II-II in Figure 1;
Figure 3 shows a perspective representation of the bone plate as claimed in the invention;
and Figure 4 shows a side view of the bone plate as claimed in the invention.
The bone plate which is shown in Figures 1 to 4 and which is used for fixation of proximal humerus fractures consists of a handle-shaped part I with a length which is greater than its width x, and a spoon-shaped part 2 with a width y which is greater than the width x of the handle-shaped part 1. The handle-shaped part 1 and the spoon-shaped part 2 have a common longitudinal central axis 3 and are interconnected by a transition area 26 which widens exponentially from the width x of the handle-shaped part 1 to the width y of the spoon-shaped part 2.
In the handle-shaped part 1 and also in the spoon-shaped part 2 a larger number of screw holes (9, 10, 16, 17; 24) is made. All the screw holes 24 made in the handle-shaped part 1 of the bone plate have an inside thread 28 (it could be replaced by partially peripheral wedge-shaped grooves).
Four of the screw holes (9, 10, 16, 17) which are made in the spoon-shaped part 2 of the bone plate likewise have an inside thread 27 (here the inside thread could also be replaced by partially peripheral wedge-shaped grooves).
The pitch of this inside thread 27; 28 (or the partially peripheral wedge-shaped grooves) is 0.8 mm. The thickness of the bone plate is 2 mm.
As is apparent from Figure 4, the handle-shaped part 1, viewed in the direction of the central axis 3, is made curved in a partial area, in the form of a elliptical arc 21.
The length of the major axis 22 of the ellipse which belongs to the elliptical arc 21 is 160 and the length of the minor axis 23 of the ellipse which belongs to the elliptical arc 21 is 70 mm. Due to the curvature of the handle-shaped part 1 the free end 5 of the handle-shaped part 1 and of the spoon-shaped part 2 is essentially in planes which are parallel to one another.
As is apparent from Figure 2, the bone plate over its entire length has a curvature 6 which runs transversely to the central axis 3 with a radius of curvature of 20 nun.
As is apparent from Figures 1 and 2, the free end portion 8 of the spoon-shaped part 2 has two holes 9, 10 which are arranged symmetrically to the central axis 3 with parallel hole axes, the axes 11, 12 of the holes forming an angle 13 of 95 with the surface 14 which is formed by the spoon-shaped part 2.
The portion 15 of the spoon-shaped part 2 bordering the transition area 26 moreover has two holes 16, 17 which are arranged asymmetrically to the central axis 3. The axes 18, 19 of the two holes 16, 17 lie in planes which are parallel to one another and which are orthogonal to the central axis 3. The projection of one axis 18 of a hole into the parallel plane which contains the other axis 19 of the hole includes an angle 20 of 50 with the axis 19 of the hole.
The pairs 9, 10, 16, 17 of holes which are arranged symmetrically and asymmetrically to the central axis 3 have an inside thread 27 which could also be replaced by partially peripheral wedge-shaped grooves. None of the axes 11; 12; 18; 19 of the pairs 9, 10, 16, 17 of holes which are arranged symmetrically and asymmetrically to the central axis 3 intersect. The inside threads 27, 28 are double threaded.
The axes of the holes 24 which have been made in the handle-shaped part 1 are perpendicular to the handle-shaped part 1.
Another preferred embodiment is that at least one of the holes which are arranged symmetrically and/or asymmetrically to the central axis has an inside thread or partially peripheral wedge-shaped grooves. Here advantageously none of the axes of the holes which are arranged symmetrically and/or asymmetrically to the central axis intersect. In this way the advantage is achieved that the screws which are to be inserted into the holes do not mutually impede one another.
In another embodiment the axes of the holes which are made in the handle-shaped part are perpendicular thereto.
The inside threads are preferably multithreaded, typically double-threaded.
The bone plate as claimed in the invention can be used both for the left and also for the right humerus and is optimally matched to the shape of the healthy proximal humerus.
The invention and development of the invention are detailed below using a partial schematic of one embodiment.
Figure 1 shows an overhead view of the bone plate as claimed in the invention;
Figure 2 shows a section along the line II-II in Figure 1;
Figure 3 shows a perspective representation of the bone plate as claimed in the invention;
and Figure 4 shows a side view of the bone plate as claimed in the invention.
The bone plate which is shown in Figures 1 to 4 and which is used for fixation of proximal humerus fractures consists of a handle-shaped part I with a length which is greater than its width x, and a spoon-shaped part 2 with a width y which is greater than the width x of the handle-shaped part 1. The handle-shaped part 1 and the spoon-shaped part 2 have a common longitudinal central axis 3 and are interconnected by a transition area 26 which widens exponentially from the width x of the handle-shaped part 1 to the width y of the spoon-shaped part 2.
In the handle-shaped part 1 and also in the spoon-shaped part 2 a larger number of screw holes (9, 10, 16, 17; 24) is made. All the screw holes 24 made in the handle-shaped part 1 of the bone plate have an inside thread 28 (it could be replaced by partially peripheral wedge-shaped grooves).
Four of the screw holes (9, 10, 16, 17) which are made in the spoon-shaped part 2 of the bone plate likewise have an inside thread 27 (here the inside thread could also be replaced by partially peripheral wedge-shaped grooves).
The pitch of this inside thread 27; 28 (or the partially peripheral wedge-shaped grooves) is 0.8 mm. The thickness of the bone plate is 2 mm.
As is apparent from Figure 4, the handle-shaped part 1, viewed in the direction of the central axis 3, is made curved in a partial area, in the form of a elliptical arc 21.
The length of the major axis 22 of the ellipse which belongs to the elliptical arc 21 is 160 and the length of the minor axis 23 of the ellipse which belongs to the elliptical arc 21 is 70 mm. Due to the curvature of the handle-shaped part 1 the free end 5 of the handle-shaped part 1 and of the spoon-shaped part 2 is essentially in planes which are parallel to one another.
As is apparent from Figure 2, the bone plate over its entire length has a curvature 6 which runs transversely to the central axis 3 with a radius of curvature of 20 nun.
As is apparent from Figures 1 and 2, the free end portion 8 of the spoon-shaped part 2 has two holes 9, 10 which are arranged symmetrically to the central axis 3 with parallel hole axes, the axes 11, 12 of the holes forming an angle 13 of 95 with the surface 14 which is formed by the spoon-shaped part 2.
The portion 15 of the spoon-shaped part 2 bordering the transition area 26 moreover has two holes 16, 17 which are arranged asymmetrically to the central axis 3. The axes 18, 19 of the two holes 16, 17 lie in planes which are parallel to one another and which are orthogonal to the central axis 3. The projection of one axis 18 of a hole into the parallel plane which contains the other axis 19 of the hole includes an angle 20 of 50 with the axis 19 of the hole.
The pairs 9, 10, 16, 17 of holes which are arranged symmetrically and asymmetrically to the central axis 3 have an inside thread 27 which could also be replaced by partially peripheral wedge-shaped grooves. None of the axes 11; 12; 18; 19 of the pairs 9, 10, 16, 17 of holes which are arranged symmetrically and asymmetrically to the central axis 3 intersect. The inside threads 27, 28 are double threaded.
The axes of the holes 24 which have been made in the handle-shaped part 1 are perpendicular to the handle-shaped part 1.
Claims (64)
1. A bone plate for fixation of proximal humerus fractures comprising:
an elongated shaft portion having a first width;
a head portion connected to the shaft portion and having a second width greater than the first width, the head portion and the shaft portion defining a common longitudinal axis;
at least one first screw hole located in the head portion; and at least one second screw hole located in the shaft portion;
wherein at least one of the first and second screw holes is configured to engage a head of a bone screw to form an angularly stable connection with the bone screw and the elongated perimeter of the at least one second screw hole is formed by first and second overlapping shapes of different size and wherein the plate further comprises a plurality of first screw holes in the head portion, and a plurality of second screw holes in the shaft portion, wherein the plurality of second screw holes are symmetrically arranged about the common longitudinal axis and the plurality of first screw holes are asymmetrically arranged about the common longitudinal axis wherein at least one of an upper surface and a lower surface of the bone plate is divided substantially in half by the common longitudinal axis, and wherein at least a first pair of the first holes is symmetrically disposed about the longitudinal axis, and at least a second pair of the first holes is asymmetrically disposed about the longitudinal axis.
an elongated shaft portion having a first width;
a head portion connected to the shaft portion and having a second width greater than the first width, the head portion and the shaft portion defining a common longitudinal axis;
at least one first screw hole located in the head portion; and at least one second screw hole located in the shaft portion;
wherein at least one of the first and second screw holes is configured to engage a head of a bone screw to form an angularly stable connection with the bone screw and the elongated perimeter of the at least one second screw hole is formed by first and second overlapping shapes of different size and wherein the plate further comprises a plurality of first screw holes in the head portion, and a plurality of second screw holes in the shaft portion, wherein the plurality of second screw holes are symmetrically arranged about the common longitudinal axis and the plurality of first screw holes are asymmetrically arranged about the common longitudinal axis wherein at least one of an upper surface and a lower surface of the bone plate is divided substantially in half by the common longitudinal axis, and wherein at least a first pair of the first holes is symmetrically disposed about the longitudinal axis, and at least a second pair of the first holes is asymmetrically disposed about the longitudinal axis.
2. The bone plate of claim 1, wherein at least one of the first and second screw holes is at least partially threaded.
3. The bone plate of claim 2, wherein the thread has a pitch of about 0.5 mm to about 1.1 mm.
4. The bone plate of claim 3, wherein the thread has a pitch of about 0.7 mm to about 0.9 mm.
5. The bone plate of claim 2, wherein the thread is double threaded.
6. The bone plate of claim 1, wherein at least one of the first and second screw holes includes at least a partial peripheral groove for engaging the head of the bone screw.
7. The bone plate of claim 6, wherein the peripheral groove is substantially wedge shaped.
8. The bone plate of claim 1, wherein the bone plate has a thickness ranging from about 1.9 mm to about 2.1 mm.
9. The bone plate of claim 1, wherein the head portion is connected to the shaft portion at a transition area having a third width that increases from the first width to the second width.
10. The bone plate of claim 9, wherein the third width widens exponentially.
11. The bone plate of claim 1, wherein at least a portion of the shaft portion is curved along the longitudinal axis.
12. The bone plate of claim 11, wherein the at least portion of the shaft portion is curved in the form of an elliptical arc.
13. The bone plate of claim 12, wherein the elliptical arc is defined by a portion of an ellipse having a major axis with a length in the range of between about 150 mm and about 170 mm.
14. The bone plate of claim 13, wherein the length of the major axis is in the range from about 157 mm to about 163 mm.
15. The bone plate of claim 12, wherein the elliptical arc is defined by a portion of an ellipse having a minor axis with a length in the range of between about 60 mm and about 80 mm.
16. The bone plate of claim 15, wherein the length of the minor axis is in the range of between about 67 mm and about 73 mm.
17. The bone plate of claim 1, wherein a distal end of the shaft portion lays in a first plane, and the head portion lays in a second plane that is substantially parallel to the first plane.
18. The bone plate of claim 1, wherein at least a portion of the bone plate has a curvature that runs transversely to the longitudinal axis.
19. The bone plate of claim 18, wherein the curvature has a radius of curvature in the range from about 18 mm to about 22 mm.
20. The bone plate of claim 18, wherein the shaft portion has a length and the curvature runs substantially over the entire length of the shaft portion.
21. The bone plate of claim 1, wherein the head portion is connected to the shaft portion at a transition portion, and the at least one first pair of first holes is located farther from the transition portion than is the at least one second pair of the first holes.
22. The bone plate of claim 1, wherein at least one of the second holes defines a central axis that is substantially perpendicular to the longitudinal axis.
23. The bone plate of claim 1, wherein the first and second overlapping shapes are circles.
24. The bone plate of claim 1, wherein the plate has a thickness ranging from about 1.7 mm to about 2.3 mm.
25. A bone plate for fixation of a fractured bone, the bone plate comprising:
an elongated shaft portion and a widened head portion, the shaft portion and the head portion defining a common longitudinal axis extending substantially centrally along the bone plate;
a first pair of screw holes located in the head portion, the first pair of holes include a first hole having a first central axis and a second hole having a second central axis, wherein the first and second holes are asymmetrically disposed about the longitudinal axis; and a second pair of screw holes located in the head portion, the second pair of holes include a third hole having a third central axis and a fourth hole having a fourth central axis, wherein the third and fourth holes are symmetrically disposed about the longitudinal axis;
wherein the first central axis lies in a first plane and the second central axis lies in a second plane that is substantially parallel to the first plane, further wherein when the first central axis and the second central axis are projected onto a third plane substantially orthogonal to the longitudinal axis, the first central axis and the second central axis intersect to form an acute angle.
an elongated shaft portion and a widened head portion, the shaft portion and the head portion defining a common longitudinal axis extending substantially centrally along the bone plate;
a first pair of screw holes located in the head portion, the first pair of holes include a first hole having a first central axis and a second hole having a second central axis, wherein the first and second holes are asymmetrically disposed about the longitudinal axis; and a second pair of screw holes located in the head portion, the second pair of holes include a third hole having a third central axis and a fourth hole having a fourth central axis, wherein the third and fourth holes are symmetrically disposed about the longitudinal axis;
wherein the first central axis lies in a first plane and the second central axis lies in a second plane that is substantially parallel to the first plane, further wherein when the first central axis and the second central axis are projected onto a third plane substantially orthogonal to the longitudinal axis, the first central axis and the second central axis intersect to form an acute angle.
26. The bone plate of claim 25, wherein the acute angle is between about 50° and about 60°.
27. The bone plate of claim 26, wherein the acute angle is between about 46° and about 54°.
28. The bone plate of claim 25, wherein the third and fourth central axes are substantially parallel to one another.
29. The bone plate of claim 25, wherein the bone plate includes an upper surface and a lower surface, and at least one of the third and fourth central axes forms an obtuse angle with respect to the lower surface.
30. The bone plate of claim 29, wherein the obtuse angle ranges between about 92° and about 98°.
31. The bone plate of claim 30, wherein the obtuse angle ranges between about 94° and about 96°.
32. The bone plate of claim 25, wherein at least one of the first, second, third and fourth screw holes includes a threading to engage a head of a bone screw.
33. The bone plate of claim 32, wherein the threading has a pitch of between about 0.5 mm and about 1.1 mm.
34. The bone plate of claim 32, wherein the threading is a double thread.
35. The bone plate of claim 25, wherein the bone plate has a thickness ranging from about 1.7 mm to about 2.3 mm.
36. The bone plate of claim 25, wherein at least a portion of the shaft portion is curved along the longitudinal axis in the form of an elliptical arc.
37. The bone plate of claim 36, wherein the elliptical arc is defined by a portion of an ellipse having a major axis with a length in the range of between about 150 mm and about 170 mm and a minor axis with a length in the range of between about 60 mm and about 80 mm.
38. The bone plate of claim 25, wherein at least a portion of the bone plate has a curvature that runs transversely to the longitudinal axis, the curvature having a radius of curvature in the range from about 18 mm to about 22 mm.
39. The bone plate of claim 25, wherein the head portion and the shaft portion are shaped and dimensioned to substantially match a proximal humerus.
40. The bone plate of claim 1, wherein the first screw holes in the head portion are configured differently than the second screw holes in the shaft portion.
41. The bone plate of claim 1, wherein the at least one second screw hole is elongated along the longitudinal axis of the plate.
42. The bone plate of claim 1, wherein the plate includes an upper surface, and a lower surface, and wherein at least two of the plurality of first screw holes have first and second central axes, and at least one of the first and second central axes form an obtuse angle of between about 92° and about 98° with respect to the lower surface of the plate.
43. A bone plate for fixation of proximal humerus fractures comprising:
an upper surface;
a lower surface;
an elongated shaft portion having a first width;
a head portion connected to the shaft portion and having a second width greater than the first width, the head portion and the shaft portion defining a common longitudinal axis, the longitudinal axis generally dividing at least one of the upper and lower surfaces in half;
at least one first screw hole located in the head portion; and at least one second screw hole located in the shaft portion;
wherein at least one of the first and second screw holes is at least partially threaded to engage a head of a bone screw to form an angularly stable connection with the bone screw, and further wherein at least a first pair of the at least one first screw hole is symmetrically disposed about the longitudinal axis, and at least a second pair of the at least one first screw hole is asymmetrically disposed about the longitudinal axis.
an upper surface;
a lower surface;
an elongated shaft portion having a first width;
a head portion connected to the shaft portion and having a second width greater than the first width, the head portion and the shaft portion defining a common longitudinal axis, the longitudinal axis generally dividing at least one of the upper and lower surfaces in half;
at least one first screw hole located in the head portion; and at least one second screw hole located in the shaft portion;
wherein at least one of the first and second screw holes is at least partially threaded to engage a head of a bone screw to form an angularly stable connection with the bone screw, and further wherein at least a first pair of the at least one first screw hole is symmetrically disposed about the longitudinal axis, and at least a second pair of the at least one first screw hole is asymmetrically disposed about the longitudinal axis.
44. The bone plate of claim 43, wherein the at least one first screw hole in the head portion is configured differently than the at least one second screw hole in the shaft portion.
45. A bone plate for fixation of proximal humerus fractures comprising:
an elongated shaft portion having a first width;
a head portion connected to the shaft portion and having a second width greater than the first width, the head portion and the shaft portion defining a common longitudinal axis;
a plurality of first screw holes located in the head portion;
a plurality of second screw holes located in the shaft portion;
wherein the plurality of first screw holes are arranged asymmetrically about the common longitudinal axis in a configuration that prevents any pair of the first screw holes to form a line that is perpendicular to the common longitudinal axis, and wherein the plurality of second screw holes are arranged symmetrically about the common longitudinal axis.
an elongated shaft portion having a first width;
a head portion connected to the shaft portion and having a second width greater than the first width, the head portion and the shaft portion defining a common longitudinal axis;
a plurality of first screw holes located in the head portion;
a plurality of second screw holes located in the shaft portion;
wherein the plurality of first screw holes are arranged asymmetrically about the common longitudinal axis in a configuration that prevents any pair of the first screw holes to form a line that is perpendicular to the common longitudinal axis, and wherein the plurality of second screw holes are arranged symmetrically about the common longitudinal axis.
46. The bone plate of claim 45, wherein at least one of the first and second screw holes is at least partially threaded.
47. The bone plate of claim 46, wherein the thread has a pitch of about 0.5 mm to about 1.1 mm.
48. The bone plate of claim 47, wherein the thread has a pitch of about 0.7 mm to about 0.9 mm.
49. The bone plate of claim 46, wherein the thread is double threaded.
50. The bone plate of claim 45, wherein at least one of the first and second screw holes includes at least a partial peripheral groove for engaging a head of a bone screw.
51. The bone plate of claim 50, wherein the peripheral groove is substantially wedge shaped.
52. The bone plate of claim 45, wherein the bone plate has a thickness ranging from about 1.7 mm to about 2.3 mm.
53. The bone plate of claim 45, wherein the bone plate has a thickness ranging from about 1.9 mm to about 2.1 mm.
54. The bone plate of claim 45, wherein the head portion is connected to the shaft portion at a transition area having a third width that increases from the first width to the second width.
55. The bone plate of claim 54, wherein the third width widens exponentially.
56. The bone plate of claim 45, wherein at least a portion of the shaft portion is curved along the longitudinal axis.
57. The bone plate of claim 56, wherein the at least portion of the shaft portion is curved in the form of an elliptical arc.
58. The bone plate of claim 57, wherein the elliptical arc is defined by a portion of an ellipse having a major axis with a length in the range of between about 150 mm and about 170 mm.
59. The bone plate of claim 58, wherein the length of the major axis is in the range from about 157 mm to about 163 mm.
60. The bone plate of claim 57, wherein the elliptical arc is defined by a portion of an ellipse having a minor axis with a length in the range of between about 60 mm and about 80 mm.
61. The bone plate of claim 60, wherein the length of the minor axis is in the range of between about 67 mm and about 73 mm.
62. The bone plate of claim 45, wherein a distal end of the shaft portion lays in a first plane, and the head portion lays in a second plane that is substantially parallel to the first plane.
63. The bone plate of claim 45, wherein at least a portion of the bone plate has a curvature that runs transversely to the common longitudinal axis.
64. The bone plate of claim 63, wherein the curvature has a radius of curvature in the range from about 18 mm to about 22 mm.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CH2001/000327 WO2002096309A1 (en) | 2001-05-28 | 2001-05-28 | Bone plate for the fixation of fractures of the proximal humerus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2448522A1 CA2448522A1 (en) | 2002-12-05 |
| CA2448522C true CA2448522C (en) | 2011-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2448522A Expired - Lifetime CA2448522C (en) | 2001-05-28 | 2001-05-28 | Bone plate for the fixation of fractures of the proximal humerus |
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| EP (1) | EP1389963B1 (en) |
| JP (1) | JP5049454B2 (en) |
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| CZ (1) | CZ20033212A3 (en) |
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| PT (1) | PT1389963E (en) |
| SI (1) | SI1389963T1 (en) |
| WO (1) | WO2002096309A1 (en) |
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2001
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- 2001-05-28 SI SI200130586T patent/SI1389963T1/en unknown
- 2001-05-28 KR KR1020037015663A patent/KR100787209B1/en not_active IP Right Cessation
- 2001-05-28 ES ES01931311T patent/ES2263617T3/en not_active Expired - Lifetime
- 2001-05-28 AU AU2001258138A patent/AU2001258138B2/en not_active Ceased
- 2001-05-28 CN CNB018233139A patent/CN100484490C/en not_active Expired - Fee Related
- 2001-05-28 DK DK01931311T patent/DK1389963T3/en active
- 2001-05-28 AT AT01931311T patent/ATE329540T1/en not_active IP Right Cessation
- 2001-05-28 MX MXPA03010812A patent/MXPA03010812A/en unknown
- 2001-05-28 BR BRPI0117031A patent/BRPI0117031B8/en not_active IP Right Cessation
- 2001-05-28 CA CA2448522A patent/CA2448522C/en not_active Expired - Lifetime
- 2001-05-28 JP JP2002592827A patent/JP5049454B2/en not_active Expired - Fee Related
- 2001-05-28 WO PCT/CH2001/000327 patent/WO2002096309A1/en active IP Right Grant
- 2001-05-28 DE DE20122742U patent/DE20122742U1/en not_active Expired - Lifetime
- 2001-05-28 CZ CZ20033212A patent/CZ20033212A3/en unknown
- 2001-05-28 DE DE50110189T patent/DE50110189D1/en not_active Expired - Lifetime
- 2001-05-28 EP EP01931311A patent/EP1389963B1/en not_active Expired - Lifetime
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2002
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2004
- 2004-03-01 HK HK04101507A patent/HK1058750A1/en not_active IP Right Cessation
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2009
- 2009-12-14 US US12/637,405 patent/US8460344B2/en not_active Expired - Lifetime
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| JP5049454B2 (en) | 2012-10-17 |
| CA2448522A1 (en) | 2002-12-05 |
| CN100484490C (en) | 2009-05-06 |
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| US20100145338A1 (en) | 2010-06-10 |
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| BRPI0117031B8 (en) | 2021-06-22 |
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| JP2004526551A (en) | 2004-09-02 |
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| PT1389963E (en) | 2006-10-31 |
| SI1389963T1 (en) | 2006-10-31 |
| US8460344B2 (en) | 2013-06-11 |
| US7655029B2 (en) | 2010-02-02 |
| HK1058750A1 (en) | 2004-06-04 |
| MXPA03010812A (en) | 2004-02-17 |
| DE20122742U1 (en) | 2007-06-14 |
| CN1527684A (en) | 2004-09-08 |
| KR20040016871A (en) | 2004-02-25 |
| BR0117031B1 (en) | 2011-09-20 |
| CZ20033212A3 (en) | 2004-05-12 |
| WO2002096309A1 (en) | 2002-12-05 |
| AU2001258138B2 (en) | 2004-10-28 |
| BR0117031A (en) | 2004-04-20 |
| DE50110189D1 (en) | 2006-07-27 |
| US20040167522A1 (en) | 2004-08-26 |
| EP1389963B1 (en) | 2006-06-14 |
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