|Publication number||US20060149245 A1|
|Application number||US 11/349,763|
|Publication date||Jul 6, 2006|
|Filing date||Feb 8, 2006|
|Priority date||Jun 9, 2004|
|Also published as||EP1761180A2, EP1761180A4, US7744635, US8617209, US20050277931, US20110004251, US20140135928, WO2005122965A2, WO2005122965A3|
|Publication number||11349763, 349763, US 2006/0149245 A1, US 2006/149245 A1, US 20060149245 A1, US 20060149245A1, US 2006149245 A1, US 2006149245A1, US-A1-20060149245, US-A1-2006149245, US2006/0149245A1, US2006/149245A1, US20060149245 A1, US20060149245A1, US2006149245 A1, US2006149245A1|
|Original Assignee||Spinal Generations, Llc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (17), Classifications (32), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This is a continuation-in-part of application Ser. No. 11/071,604, filed Mar. 3, 2005, which is a continuation-in-part of application Ser. No. 10/864,673, filed Jun. 9, 2004, both of which are incorporated herein by reference herein.
The present invention relates to instrumentation and methods used in the installation of bone screws, alone or in combination with other implantable orthopedic devices. In particular, the present invention relates to a bone fixation system and related surgical methods.
The bones of the human skeletal system may be compromised in various ways, including by disease or defect, such as a tumor, or an injury, such as a bone fracture. The resulting defects or abnormalities in the skeletal system often require treatment to ensure proper functioning of the skeletal system and the avoidance of undue pain and discomfort.
Various treatments exist for the treatment of bone fractures and/or bone or skeletal abnormalities. These treatments include, among others, the use of internal bone fixation devices, such as bone screws, used alone or in combination with other implantable orthopedic devices. Used alone, one or more bone screws may be employed to treat a bone fracture by stabilizing various bone pieces together and providing support during the healing process. Bone screws may also be used to fuse bones that are otherwise normally separate by screwing directly through one bone into a second bone. Used in combination with other implantable devices, bone screws may be used to secure a fixation device directly or indirectly onto bone fracture pieces or separate bones intended to be fused.
Conventionally, bone screws are installed by performing one or more of a number of steps. First, a pilot hole to receive the bone screw may need to be drilled and tapped to accommodate the appropriate screw thread type. A guide wire is often installed along the desired insertion path of the bone screw. The bone screw is screwed over the guide wire into place using a driver, and the guide wire is subsequently removed. The insertion of the bone screw may or may not additionally involve the securing of some type of fixation device to the bone material, either directly to the surface of the bone or though attachment to one or more exposed portions of bone screws.
One challenge associated with the use of bone screws in bone fixation procedures is the number of steps involved in the process. As discussed above, certain procedures may involve, for each bone screw, drilling a hole, tapping the hole, inserting a guide wire into the hole, driving a bone screw over the guide wire, and removing the guide wire. Ideally, the number of steps involved in the process should be minimized to reduce the overall time of the surgical procedure.
Ideally, a bone fixation system should also be configured for use with a minimally invasive surgical approach, such as one that utilizes smaller access apertures or ports rather than a large incision along the entire portion of the bone or bones being treated.
An additional challenge is minimizing the number of sharp or pointed objects that remain within a fixated region of a patient after surgery. Such sharp or pointed objects may contribute to producing undesirable conditions related to bone structure or bone function. Ideally, the number of sharp or pointed objects remaining within fixated bone regions of patients after surgery should be minimized.
There is also a need to be able to deliver fluids directly to the site of a bone fixation procedure. Certain bone fixations heal more slowly than others, and the healing process may be facilitated by the delivery of certain fluids to the fixated region. It is therefore desirable to have a vehicle for easy delivery of fluids to fixated regions of bone.
It would be desirable to provide a system and/or method that provides one or more of these or other advantageous features or addresses one or more of the above-identified needs. Other features and advantages will be made apparent from the present specification. The teachings disclosed extend to those embodiments that fall within the scope of the appended claims, regardless of whether they accomplish one or more of the above-identified needs.
The invention relates to a bone fixation system having a bone screw with a longitudinal axis and a passage in the bone screw extending along the longitudinal axis, the passage having a proximal opening at a proximal end of the screw and a distal opening at a distal end of the screw. A drill extends through the passage, a first end of the drill extending out the distal opening, whereby the combination of the bone screw and the drill is self-drilling.
The invention further relates to a bone fixation instrumentation kit having a bone screw with a passage extending along a longitudinal axis, the passage having a proximal opening at a proximal end of the screw and a distal opening at a distal end of the screw. The kit further contains a driver adapted to extend through the passage, whereby the combination of the bone screw and the driver is self-drilling.
The invention further relates to a method for connecting a bone screw to a bone. The method includes the steps of opening an aperture in a patient to permit access to a bone, providing a bone screw having a passage extending along a longitudinal axis of the screw, the passage having a keyed portion, a proximal opening at a proximal end of the screw, and a distal opening at a distal end of the screw. The method further includes the steps of providing a drill having a shaft, a cutting tip, and a keyed segment configured to interlock with the keyed portion, inserting the drill into the passage such that the cutting tip protrudes from the distal opening and the keyed segment interlocks with the keyed portion, and rotating the drill and screw to simultaneously drill a pilot hole and screw the bone screw into the bone. The method further includes the step of removing the drill from the bone screw without also removing the bone screw from the bone.
The invention further relates to a method for attaching a bone screw to a plurality of bone segments. The method includes opening an aperture in a patient to permit access to a first bone segment and a second bone segment, providing a bone screw having a passage extending along a longitudinal axis of the bone screw, the passage having a proximal opening at a proximal end of the bone screw and a distal opening at a distal end of the bone screw, providing a driver, inserting the driver into the passage, driving the screw into and through the first bone segment and onto the second bone segment, and removing the driver from the passage without removing the bone screw from the first and second bone segments.
The invention is capable of other embodiments and of being practiced or being carried out in various ways. Alternative exemplary embodiments relate to other features and combinations of features as may be generally recited in the claims.
The invention will become more fully understood from the following detailed description, taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like elements, in which:
Drill 28 includes a shaft 30 sized to fit within a passage 22 (see
Further referring to
Further referring to
Further referring to
Note that the collet 56 may be locked onto post 18 at any position along the longitudinal axis of post 18, affording flexibility in the placement of the coupling mechanism components. In other bone screw embodiments, the collet may engage with the threaded portion of the bone screw. The flexibility in placement of the collet is important due to the variability in placement of the bone screw 10 depending on the anatomy of the patient. Once the receiver 46, collar 52, and collet 56 are locked into place onto bone screw 10, the fixation plate 42 may be linked to the bone screw 10 by placing retainer rings 66, 68 over the post 18 on either side of the fixation plate 42 and locking the fixation plate 42 into place by threading upper set screw 70 into receiver 46 to complete the assembly.
Further referring to
Further referring to
The various bone fixation or instrumentation systems described herein as exemplary embodiments of the invention may be utilized in the performance of bone fixation procedures using a streamlined method that is intended to simplify and shorten conventional bone fixation procedures. Prior to operating, imaging of the patient may be utilized to determine the number and locations of bone screws that will be required as part of the procedure. Further, an image guidance system may be utilized as part of the procedure to aid in the placement of the various components. In the case of an open procedure, an entry site is created in the patient along the portion of the bone into which the bone screws will be inserted. In the case of a minimally invasive procedure, individual entry ports may be utilized for implantation of individual bone screws. Certain embodiments of the invention described herein are particularly suited to a minimally invasive approach because the coupling components are placed upon the screw from the top, allowing insertion and connection of the components via the small percutaneous aperture created for the screw itself in contrast to other designs requiring the use of coupling components that are not in line with the longitudinal axis of the screw, which may require an open procedure.
After creating the entry site and determining the point of insertion of a bone screw, the drill may be inserted into the bone screw, using the holding device to hold the drill in place, if desired, and utilized to drill into the bone simultaneously with the bone screw.
In addition to the embodiment of the invention shown in use on a portion of the spine in
If a fixation plate is to be installed, a portion of each of the bone screws is left exposed outside of the bone material as shown in
In the embodiments described herein, drill 28 is provided with drill tip 34 to make the combination of bone screw 10 and drill 28 self-drilling. It should be noted that after insertion of bone screw 10, drill 28 may be removed, thereby ensuring that no sharp or pointed objects (e.g., drill tip 34) remain within the patent.
While the detailed drawings and specific examples given herein describe various exemplary embodiments, they serve the purpose of illustration only. It is to be understood that the invention is not limited in its application to the details of construction and arrangements of components set forth in the preceding description or illustrated in the drawings. It should be noted that the components and/or assemblies of the bone fixation system may be constructed from various materials known in the art. Further, while several examples show the invention in the context of various skeletal regions, the invention is applicable to surgical procedures involving other regions not described in the embodiments contained herein. Further, the order of performance of the method steps described with respect to bone fixation procedures utilizing the various embodiments of the present invention may vary. Furthermore, other substitutions, modifications, changes and omissions may be made in the design, operating conditions, and arrangements of the exemplary embodiments without departing from the scope of the invention as expressed in the appended claims.
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|U.S. Classification||606/279, 606/900, 606/286, 606/304, 606/916|
|International Classification||A61B17/86, A61B17/80, A61F2/30, A61B17/70, A61B17/16|
|Cooperative Classification||A61B17/7032, A61B17/8047, A61B17/7041, A61F2/4455, A61B17/701, A61B17/7037, A61B17/8685, A61B17/7007, A61F2002/30909, A61B17/7011, A61B17/704, A61B17/7005, A61B17/863, A61B17/1671|
|European Classification||A61B17/70B2, A61B17/70B1C2, A61B17/70B1E, A61B17/16S4, A61B17/70B6, A61B17/70B1C4, A61B17/80D6, A61B17/70B5B|
|Feb 8, 2006||AS||Assignment|
Owner name: SPINAL GENERATIONS, LLC, ILLINOIS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SWEENEY, PATRICK J.;REEL/FRAME:017551/0561
Effective date: 20060207