Patent Application
20240016526
The present disclosure generally relates to bone plates. In particular, a bone plate for fixing a bone fragment to a bone is disclosed which comprises positioning means for an initial bone plate fixation and position adjustment. The bone plate may be applied for fragmented long bones, in particular for fragmented bone of the proximal humerus. The present disclosure also relates to a method for fixing a bone fragment to a bone.
To promote the healing process of a damaged or fragmented bone, bone plates are commonly attached to an outside surface of the bone. The bone plates act as stabilizing elements for the damaged area. In addition, they may help to position fragmented bone sections relative to one another.
For attaching a bone plate to a bone, various fixation techniques have been suggested. For example, screws may be applied which are inserted in through-holes of the bone plate and then screwed into an adjacent bone portion. Likewise, circumferential wires can be wrapped around a cross-section of the bone and a bone plate arranged at the bone. The wires are then tightened to secure the bone plate at the bone and to avoid a relative movement therebetween.
For a successful healing process of the damaged or fragmented bone without any subsequent movement restrictions and/or pain, it is crucial that the bone plate is correctly positioned relative to the fragmented bone. To that end, it is known to provide an oblong screw hole in the bone plate, which allows for a vertical plate adjustment using a screw. Additionally, a K-Wire may be inserted into a K-Wire opening for verifying a correct position of the bone plate by X-ray imaging. If the initially chosen position is so inaccurate that it cannot be adjusted by unscrewing the screw for releasing compression of the plate to the bone and gliding the screw in and along the oblong screw hole of the bone plate, the screw might need to be completely removed from the bone and re-placed at another, corrected position, thereby leaving a relatively large opening in the bone. Especially when treating proximal humerus fractures, one of the main surgical goals is finding the correct position of the bone plate.
From US 2013/0053899 A1, a bone plate with a hook portion having an elongated guiding opening is known. The elongated guiding opening is configured to receive a K-Wire along which the hook portion may be slid for guiding the bone plate towards a bone fragment. The height of the plate relative to the bone to which the plate is to be attached is defined by a bent portion of the hook portion configured to grasp a bone fragment.
From U.S. Pat. No. 8,936,615 B2, a bone plate with two elongated holes is known which each are configured to receive a K-Wire inserted into a respective bone segment separated by a bone gap. By applying a force to the K-Wires, at least one of the bone segments is translated with respect to the other bone segment so that the bone gap is reduced.
There is a need for a bone plate which can be reliably positioned relative to the bone fragment while minimizing the damage caused to the bone.
According to one aspect, a bone plate for fixing a bone fragment to a bone is provided which comprises a proximal bone plate portion including a proximal longitudinal end of the bone plate and a distal bone plate portion including a distal longitudinal end of the bone plate, wherein the bone plate extends from the proximal longitudinal end to the distal longitudinal end in a longitudinal direction. The proximal bone plate portion is configured to abut on the bone fragment and the distal bone plate portion is configured to abut on the bone. The proximal bone plate portion comprises a slotted positioning opening configured to receive an elongated positioning member and one or more fastening openings configured to receive a respective fastening element for fastening the bone plate to at least one of the bone and the bone fragment. The slotted positioning opening has a length extension in the longitudinal direction that is smaller than a width extension in a lateral direction perpendicular to the longitudinal direction.
The one or more fastening openings is or are positioned in a lateral direction relative to the slotted positioning opening and along the length extension of the slotted positioning opening.
The bone plate may be used for every kind of bone, in particular for fixing one or more bone fragments to a bone. The bone may be a long bone, for example a humerus or a femur. The bone plate may be laterally placed on the bone. The bone fragment may be proximally located at the bone. The proximal bone plate portion may be located more proximal than the distal bone plate portion when attached to the bone. The proximal longitudinal end may be the outer longitudinal edge of the proximal bone plate portion and the distal longitudinal end may be the outer longitudinal edge of the distal bone plate portion. A distance between the outermost point of the proximal longitudinal end and the outermost point of the distal longitudinal end may define the length extension of the bone plate, i.e. the extension of the bone plate in a longitudinal direction.
In the case of a proximal humeral bone plate, for example, the proximal bone plate portion may be configured to abut on an epiphyseal region of the bone, in particular partly on an epiphyseal region and/or on a part of the epiphyseal region. The proximal bone plate portion may be also configured to abut on a metaphyseal region of the bone. The distal bone plate portion may be configured to abut on a diaphyseal region of the bone and/or on a metaphyseal region of the bone.
The proximal bone plate portion and/or the distal bone plate portion may be anatomically pre-formed so as to conform to the outer contour of the respective region. For example, they may be pre-bent so as to conform to the outer contour of the respective region. For example, the proximal bone plate portion may be anatomically pre-formed so as to conform to a convex surface of the bone in the epiphyseal region. For that purpose, the proximal bone plate portion, when viewing the bone plate from a side, may laterally project from the distal bone plate portion.
The slotted positioning opening may be configured such that a common screw used for fastening the bone plate to the bone cannot be inserted into the slotted positioning opening. In particular, the lateral dimension of the slotted positioning opening may be too small for receiving a common fastening screw. The slotted positioning opening may have a uniform width extension over its whole length extension (with the exception of the tip portion of the slotted positioning opening, which may have a rounded shape). The slotted positioning opening may have a slot-like shape, i.e. may form a narrow elongated opening. The slotted positioning opening may be non-threaded. The slotted positioning opening may be configured to receive an elongated positioning member other than a screw. The slotted positioning opening and the elongated positioning member may be configured such that the elongated positioning member may slide along and in the slotted positioning opening. The elongated positioning member may be a rigid elongated positioning member. The elongated positioning member may be non-threaded along its longitudinal extension, with the possibly exception of a threaded tip. The elongated positioning member may be a K-Wire or a bone pin.
The slotted positioning opening and the elongated positioning member may be means for the initial bone plate fixation.
The slotted positioning opening may have a length extension substantially parallel to the longitudinal direction of the bone plate. In other implementations, the length extension of the slotted positioning opening is inclined with respect to the longitudinal direction, for example at an angle between 5° to 30°.
The slotted positioning opening is formed in the proximal bone plate portion and thus may be located at a proximal portion of the bone. The slotted positioning opening may, for example, be positioned on an epiphyseal region of the bone and/or a metaphyseal region of the bone. The slotted positioning opening may be positioned close to a calcar region of the bone. The elongated positioning member, when inserted in the slotted positioning opening and the underneath bone, may help to position the bone plate relative to the calcar region of the bone. The bone plate may comprise exactly one slotted positioning opening. The bone plate may also comprise two or more slotted positioning openings. The elongated positioning member may be adapted to both initially fix the bone plate to the bone and verify whether the bone plate is correctly positioned. The elongated positioning opening may protrude from the bone plate with an end when being inserted into the bone with the other end.
If more than one fastening opening is provided laterally to the slotted positioning opening, the fastening openings may be located on a same side of the slotted positioning opening or on both sides thereof. One or more of the one or more fastening openings may be locking openings, in particular angularly stable locking openings. A locking mechanism may be provided in the periphery of the opening itself, or may be provided by means of a locking insert inserted into the opening. The locking mechanism may be a polyaxial or monoaxial locking mechanism. A fastening opening may have a circular form. A fastening opening may also have an oblong form.
The slotted positioning opening and the one or more fastening openings may be positioned on the bone plate so as to be positioned close to bone fragment of the bone when the bone plate is attached to the bone. The one or more fastening openings lateral to the slotted positioning opening may be positioned on the bone plate so as to be positioned on a metaphyseal region and/or on an epiphyseal region of the bone when the bone plate is attached to the bone.
The bone plate may be part of a bone plate system also comprising the elongated positioning member.
In some implementations, a maximum width extension of the slotted positioning opening may amount to approximately 1.0 to 3.0 mm, in particular to approximately 1.5 to 2.5 mm (e.g., to approximately 2.0 mm). In particular, the slotted positioning opening may be configured to receive an elongated positioning member with a maximum width extension of 2.0 mm, for example with a maximum diameter of 2.0 mm. Thus, the maximum width dimension of the slotted positioning opening may be approximately 2.0 mm, in particular slightly more than 2.0 mm. Thus, the slotted positioning opening may have a width dimension that corresponds approximately to the width dimension of the elongated positioning member.
The slotted positioning opening may be configured to receive a K-Wire. As such, the elongated positioning member may be a K-Wire. The K-Wire has a smaller dimension than a common fastening screw used for fastening a bone plate to a bone. The K-Wire is adapted to both initially fix the bone plate to the bone and verify whether the bone plate is correctly positioned.
In some implementations, the distal bone plate portion may comprise an oblong opening configured to receive a fastening member and having a length extension in the longitudinal direction of the bone plate. Thus, the oblong opening may have a larger dimension in the longitudinal direction, i.e. a length, than in the lateral direction, i.e. a width. The oblong opening may function as an alternative positioning opening in case the bone quality is not sufficiently good on the region of the slotted positioning hole. The fastening member may be a screw, in particular a non-locking screw. As such, the oblong opening may be a screw opening. The non-locking screw may be a compression screw. The oblong portion may be provided in a shaft portion of the bone plate. The oblong opening may be so positioned in the bone plate that it is positioned on a diaphyseal region of the bone when the bone plate is attached to the bone.
In other implementations, a width extension of the slotted positioning opening, i.e. a width dimension, may be smaller than a width extension of the oblong opening, i.e. a width dimension.
In further implementations, the bone plate may comprise at least one of one or more further fastening openings positioned above the slotted positioning hole in the proximal bone plate portion closer to the proximal end than the slotted positioning opening, and one or more further fastening openings positioned below the slotted positioning hole closer to the distal end than the slotted positioning opening in at least one of the proximal bone plate portion and the distal bone plate portion. The one or more further fastening openings may be configured as described above with respect to the one or more fastening openings provided laterally to the slotted positioning opening. The one or more further fastening openings may be provided for fixing the proximal bone plate portion to the bone and/or one or more bone fragments. One or more of the further fastening openings may be configured to connect a targeting device for inserting the fastening members into the bone plate and bone to the bone plate.
In particular, one or more of the further fastening openings may be configured to receive a respective targeting arm. These one or more further fastening openings may be monoaxial locking openings.
In some implementations, the one or more further fastening openings positioned below the slotted positioning hole, if present, may be positioned between the slotted positioning opening and the oblong opening in at least one of the distal bone plate portion and proximal bone plate portion, and/or below the oblong opening closer to the distal end than the oblong opening in the proximal bone plate portion. Thus, a plurality of fastening openings and further fastening openings may be provided along the overall length extension of the bone plate.
In some configurations, the distal bone plate portion may be configured as not to comprise any fastening openings positioned in the lateral direction relative to the oblong opening and along the length extension of the oblong opening. Other than laterally to the slotted positioning opening where one or more fastening openings are formed, no fastening opening may be formed lateral to the oblong opening and along a length dimension of the oblong opening.
In some implementations, at least some of the further fastening openings may be locking openings. In particular, as described with respect to the fastening openings arranged laterally to the slotted positioning opening, at least some of the further fastening openings may be angularly stable locking openings.
In still further implementations, the proximal bone plate portion may comprise at least one of one or more K-Wire openings configured to receive a K-Wire and positioned above the slotted positioning hole in the proximal bone plate portion closer to the proximal end than the slotted positioning opening, and one or more K-Wire openings configured to receive a K-Wire and positioned below the slotted positioning opening closer to the distal end than the slotted positioning opening. The K-Wire openings may have a circular diameter. A K-Wire opening may have a smaller dimension, in particular a smaller diameter, than a fastening opening.
The K-Wire holes may by non-threaded. The one or more K-Wire holes may be also configured to receive suture for stabilizing the bone plate/bone system. In the proximal bone plate portion, the K-Wire holes may be distributed at a peripheral edge zone of the proximal bone plate portion.
In some implementations, one or more of the one or more K-Wire openings, in particular two of the one or more K-Wire openings, may be configured to receive a pin of a targeting device adapted to insert the fastening members into the bone plate for preventing a rotation of bone plate relative to the targeting device.
In specific implementations, the bone plate may be a proximal humeral bone plate, the proximal bone plate portion may be configured to abut on a humeral portion in a region of a greater tuberosity, and the distal bone plate portion may be configured to abut on a humeral shaft portion. Specifically, the bone plate may be a lateral proximal humeral bone plate for treating fragmented bone at a proximal end of the humerus. In the case of a proximal humeral bone plate, the slotted positioning hole may be positioned so that an elongated positioning member (such as a K-Wire) inserted in the slotted positioning hole extends in or close to a calcar region of the humerus. The elongated positioning member may act as an indicator for plate position in regards of the calcar region.
In further implementations, the proximal bone plate portion may have a width extension that is greater than the width extension of the distal bone plate portion. The proximal bone plate portion may provide a bone plate head and the distal bone plate portion may provide a bone plate shaft. The width extension of the proximal bone plate portion may tend to decrease with decreasing distance to the distal bone plate portion.
The proximal bone plate portion and the distal bone plate portion may adjoin each other. Thus, the proximal and distal bone plate portion may directly adjoin each other without an intermediate bone plate portion located inbetween.
According to a further aspect, a proximal humeral bone plate is provided which comprises a proximal bone plate portion including a proximal longitudinal end of the bone plate and a distal bone plate portion including a distal longitudinal end of the bone plate, wherein the bone plate extends from the proximal longitudinal end to the distal longitudinal end in a longitudinal direction. The proximal bone plate portion is configured to abut on a humeral portion in a region of a greater tuberosity and the distal bone plate portion is configured to abut on a humeral shaft portion. The proximal bone plate portion comprises a slotted positioning opening configured to receive a K-wire for extending in or close to a calcar region of the humerus, wherein the slotted positioning opening has a length extension in the longitudinal direction that is smaller than a width extension in a lateral direction perpendicular to the longitudinal direction.
In some implementations of the further aspect, a maximum width extension of the slotted positioning opening may amount to approximately 1.0 to 3.0 mm, in particular to approximately 1.5 to 2.5 mm (such as to approximately 2.0 mm).
In still other implementations of the further aspect, the bone plate may comprise one or more fastening openings configured to receive a respective fastening element for fastening the bone plate to the humerus, wherein the one or more fastening openings are positioned in the lateral direction relative to the slotted positioning opening and along the length extension of the slotted positioning opening.
According to a still further aspect, a method for adjusting a position of a humerus bone plate is provided, wherein the method comprises the steps of positioning a bone plate on the humerus so that a proximal bone plate portion abuts on a humeral portion in a region of a greater tuberosity and a distal bone plate portion abuts on a humeral shaft portion, inserting a K-Wire into a slotted positioning opening provided in the proximal bone plate portion so that the K-Wire extends into a calcar region of the humerus or is positioned close to the calcar region of the humerus, and verifying whether the K-Wire is correctly positioned in the calcar region or close to the calcar region. If it is determined that the K-Wire is not correctly positioned, the bone plate is moved in a longitudinal direction of the bone plate with the K-Wire gliding in the slotted positioning hole for adjusting the bone plate position. If it is determined that the K-Wire is correctly positioned, fastening screws are inserted into fastening openings in the proximal bone plate portion.
The step of verifying whether the K-Wire is correctly positioned may be a visual inspection by the surgeon. Optionally, the step of verifying the correct position may also comprise taking an image by an appropriate imaging technique, for example by taking an X-Ray image.
In some implementations of the method, the step of inserting fastening screws into fastening openings in the proximal bone plate portion may comprise inserting one or more calcar screws into respective one or more fastening openings provided in the proximal bone plate portion so as to protrude into the humerus close to the calcar region or into the calcar region of the humerus.
Further details, advantages and aspects of the present disclosure will become apparent from the following implementations of the present disclosure taken in conjunction with the drawings, wherein:
In the following, an implementation of a bone plate according to the present disclosure will be described.
The bone plate 10 illustrated in
In detail, the bone plate 10 comprises a proximal bone plate portion 12 and a distal bone plate portion 14 which are directly adjacent to each other, i.e. adjoin each other. A dashed line 16 is inserted in
The proximal bone plate portion 12 is intended to cooperate with a bone fragment or bone fragments. In particular, the proximal bone plate portion 12 is intended to contact the bone fragment or bone fragments. More particularly, the proximal bone plate portion 12 is configured to abut on a humeral portion in a region of a greater tuberosity. For that purpose, the proximal bone plate portion 12 may be anatomically pre-formed so as to conform to a convex surface of the humerus in a region of the greater tubercle. The distal bone plate portion 14 is configured to contact a humeral shaft portion, which may be separated from the region of the greater tuberosity by one or more fracture lines. In some implementations, one or more fracture lines exist between the region of the greater tuberosity and the shaft portion. Thus, the one or more fracture lines may be formed in the shaft or in a region between the shaft and greater tuberosity, i.e. in the metaphyseal region. In some implementations, one or more fracture lines are formed additionally or alternatively in the epiphyseal region, for example in a region in or close to the greater tuberosity.
The proximal bone plate portion 12 comprises a slotted positioning opening 22 configured to receive an elongated positioning member. While in the present implementation described in the following with reference to the figures the positioning member is a K-Wire, in other implementations the positioning member may be any kind of rigid elongated member configured to be inserted in the slotted positioning opening 22 for preliminarily fixing and adjusting the bone plate 10, for example a pin or a wire in general. The slotted positioning opening 22 extends along a longitudinal direction of the bone plate 10 and has a larger dimension in the longitudinal direction than in a lateral direction perpendicular to the longitudinal direction. The longitudinal direction is the direction along the height (length extension) of the bone plate 10. In the present implementation, the slotted positioning opening 22 is configured to receive a K-Wire with a maximum diameter of 2.0 mm. Thus, the maximum dimension of the slotted positioning opening in the lateral direction, i.e. a maximum width dimension of the slotted positioning opening, is approximately 2.0 mm, in particular slightly larger than 2.0 mm, for example 2.05 mm or 2.5 mm. The dimension of the slotted positioning opening in the longitudinal direction, i.e. a length dimension of the slotted positioning opening, is approximately 1 cm. In the present implementation, the slotted positioning opening 22 is non-threaded and has a smooth and non-structured peripheral surface. In other implementations, the slotted positioning opening 22 may have a thread or another non-locking structure which allows, in cooperation with the associated positioning member, a longitudinal displacement of the bone plate 10 along the positioning member in the slotted positioning opening 22.
In other indications than for the proximal humerus, the dimensions of the slotted positioning opening may be different than described above. For example, in case of a femoral bone plate, the slotted positioning opening may have a larger length dimension than described above.
The bone plate 10 of
In the present implementation, the oblong opening 24 functions as an alternative positioning opening, as will be explained below. Further in the present implementation, the oblong opening 24 has a multi-facetted structure at its periphery that is intended to cooperate with the screw head so as to exert compression forces in the bone segments in a direction corresponding to the longitudinal direction of the plate 10. The multi-facetted structure is configured such that it allows a displacement of the screw along the oblong opening 24. In other implementations, the oblong opening 24 may be non-threaded or may have a thread or another non-locking structure at its periphery. The thread or other non-locking structure may also allow, in cooperation with the associated fastening member, a longitudinal displacement of the bone plate 10 along the fastening member in the oblong opening 24.
In addition to the slotted positioning opening 22 and the oblong opening 24, the bone plate 10 of
In the proximal bone plate portion 12, laterally to the slotted positioning opening 22 and along the length extension of the slotted positioning opening 22, one or more fastening openings 26 are formed. In the bone plate of
Further fastening openings 28 are formed between the proximal end of the slotted positioning opening 22 and the proximal longitudinal end 18 of the bone plate 10, with respect to
Also in the bone plate 10 of
Thus, in the bone plate 10 of
Generally, in the implementations according to the present disclosure, one or more of the fastening openings 26, 28 may be a locking opening. The one or more locking openings comprise a locking structure for locking a bone fastener received through that opening 26, 28 at a selected angle to the bone plate 10. The locking structure can include a threaded portion or a circumferential lip (or other structure) adapted to lockingly engage the bone fastener, in particular a threaded head thereof. In one variant, the locking structure has one or more protrusions extending in a radial direction towards the centre of the fastening opening 26, 28.
A bone fastening element can be polyaxially or monoaxially insertable through the fastening opening 26, 28, such that the locking structure may receive a head portion of a fastening element for locking engagement. A fastening element may have a self-cutting portion that can be inserted into the fastening opening 26, 28 for engaging the locking structure.
In the implementation illustrated in
Multiple fastening openings 30 of the fastening openings 28 are intended for receiving calcar screws, which, with the bone plate 10 correctly positioned on the proximal humerus, are positioned with their tips in the calcar region when being inserted into the bone. In the bone plate of
Further to the above-described openings, the bone plate 10 of
In the implementation of
As will be described below, at least one of the K-Wire openings 32 is also configured to cooperate with a targeting device so as to prevent a rotation of the bone plate 10 against the targeting device.
By means of the following
The humerus 40 shown in
As is illustrated in
Then, in a next step, a K-Wire 48 is inserted in the slotted positioning hole 22 and into the bone next to the slotted positioning hole 22. Advantageously, the K-Wire 48 is inserted so as to be positioned in or close to a middle position of the slotted positioning hole 22. This step corresponds to step 310 of
In a subsequent step, as is illustrated in
The calcar region is a designated area at the base of the humerus head on its medial aspect. The humeral calcar refers to the inferomedial cortical area where the humeral head extends to the surgical neck of the humerus. For example, in
Before taking an X-ray picture, the position of the bone plate 10 may be checked by visual inspection only. If the result of the visual inspection is that the bone plate is clearly not correctly positioned, the bone plate 10 may be also adjusted by displacing the bone plate 10 in a proximal or distal direction of the humerus without before taking an X-ray picture. In other cases, i.e. if it is not obvious that the bone plate 10 is not correctly positioned and/or for additionally verifying the result of the visual inspection, an X-Ray picture is taken as described above after the visual inspection.
The above-described steps of the visual inspection and/or taking an
X-ray picture are exemplified by step 320 in
If it is concluded that the bone plate longitudinal (height) position is not correct, in a further subsequent step, the plate 10 is adjusted by displacing the bone plate 10 in a proximal or distal direction of the humerus 40, thereby gliding the K-Wire 48 in the slotted positioning opening 22. This is exemplified by steps 330 and 340 of
In some cases, the provisional alignment may be so incorrect that it cannot be adjusted by moving the K-Wire 48 along the slotted positioning opening 22 a distance pre-defined by the longitudinal dimension of the slotted positioning opening 22. In these cases, the K-Wire 48 has to be removed and re-placed at a new, corrected position.
In
The X-Ray imaging step described with reference to
If it is determined that the bone plate position is correct, in a next step, calcar screws (designated with reference numeral 70 in
These steps are exemplified by steps 330 and 350 of
Subsequently, the position of the respective calcar screw is checked, for example by fluoroscopy. In case the position and/or orientation is not correct, the calcar screw is removed and re-placed at a new, corrected position. If, for correcting the position of the calcar screw the bone plate 10 has to be moved in a longitudinal direction a distance larger than allowed by the slotted positioning hole 22, also the K-Wire 48 is removed, the bone plate height is adjusted and the K-Wire 48 is re-inserted in the slotted positioning hole at the adjusted position before the calcar screw is inserted in the respective fastening opening 28, 30 and the position of the calcar screw is re-checked.
The steps described in the last paragraph are repeated until it is determined that the calcar screw position is correct.
After that, the other screws are placed in the fastening openings 26, 28 in the proximal bone plate portion 12, in a manner commonly known. For example, before inserting the other screws, the bone plate 10 may be preliminarily fixed by inserting K-Wires in one or more of the circular K-Wire openings 32 in the proximal bone plate portion 12.
Finally, screws are placed in the fastening openings 28 in the distal bone plate portion 14, also in a manner commonly known. The oblong opening 24 may be also used as a fastening opening by inserting a screw therein and in the underneath bone.
The oblong opening 24 in the distal bone plate portion 14 functions as an alternative positioning opening in case the bone quality is not sufficiently good in the bone area where the K-Wire 48 is used in combination with the slotted positioning opening 22. The oblong opening 24 is provided at the junction of the peri-articular area of the bone plate 10 and a shaft portion located at a distal end region of the distal bone plate portion 14. If the oblong opening 24 is used as the positioning opening, the bone plate 10 is placed on the bone portion concerned as described above, and instead of inserting the K-Wire 48 in the slotted positioning opening 22, a screw, in particular a non-locking screw, is inserted in the oblong opening 24 and the bone underneath for preliminary fixation of the bone plate 10. A K-Wire may be additionally inserted in the circular K-Wire opening 32 of the distal bone plate portion 14. Then, the position of the bone plate 10 is checked by fluoroscopy, for example, and if adjustment is required, the bone plate 10 may be moved in a longitudinal direction along the screw in the oblong opening 24 (after having removed the K-Wire, if present).
When it is verified that the position is correct, fastening screws are inserted in the distal bone plate portion 14, before fixation of the proximal bone plate portion 12 by inserting screws in the proximal bone plate portion 12 in a known manner.
As is seen in these figures, the targeting device 52 has a targeting arm 54 inserted into a fastening opening of the bone plate 10′ for connecting the targeting device 52 to the bone plate 10′. A pin 56 laterally projects from the targeting arm 54 which has a pin end 58 configured to be received by one of the openings in the bone plate 10′. In this manner, a rotation of the plate against the targeting device 52 is prevented.
Further seen in
Referring now again to
Furthermore, in the bone plate 10 if
The K-Wire opening 66 is designed to allow the pin 56 limiting the rotation of the targeting device 52, which can create enormous moments/forces. To that end, in the present implementation, the K-Wire opening 66 has a larger diameter than the K-Wire openings 32.
The proximal humeral bone plate 110 structurally corresponds to the proximal humeral bone plate 10 described with reference to
Since the distal bone plate portion 112, which corresponds to a shaft portion of the bone plate 110, has a longer length extension, more further fastening openings 128 are provided in the distal bone plate portion 114 compared to the number of further fastening openings 28 in the distal bone plate portion 14 of
As in the implementation of
The bone plate according to the present disclosure has a slotted positioning opening which has a relatively small width extension and thus can be placed in a proximal portion of the bone plate. The slotted positioning opening is configured to receive an elongated positioning member, with relatively small dimensions. The elongated positioning member is both adapted to initially fix the bone plate to the bone as well as to be a verifying member whether the bone plate is correctly positioned. No other members such as screws are needed. To adjust the position, the bone plate can be moved in a longitudinal direction with the elongated positioning member gliding in the slotted positioning opening.
The elongated positioning member creates a relatively small footprint on the bone. Hence, the plate position can be changed easily, even of the position is completely wrong and the elongated positioning member has to be re-placed in the bone.
If the bone plate is a proximal humeral bone plate, the elongated positioning member inserted into the slotted positioning opening is placed close or in the calcar region, so that the bone plate position with respect to the calcar region can be verified.
