This patent application has not been assigned to a company or institution.
The following quote was obtained by the news editors from the background information supplied by the inventors: "This application relates to surgery for repair of injured articulating joints between bones in mammals, and to a method and a device for use therein.
"The caudal and cranial cruciate ligaments are the primary stabilizers of the stifle joint in mammals such as canines. The caudal cruciate ligament originates from the lateral side of the medial femoral condyle and inserts on the medial aspect of the popliteal notch of the tibia. The cranial cruciate ligament originates from the medial side of the lateral femoral condyle and inserts on the cranial medial tibial plateau. In canines, the stifle joint is normally capable of flexion and extension with a 110 degree range of motion, varus and valgus angulation, and internal and external rotation. The stifle is extended by the quadriceps muscle group. Injury to a cruciate ligament will commonly result in destabilization of the joint. The joint must be surgically stabilized following such an injury.
"Current surgical techniques for anterior cruciate ligament replacement and/or stabilization in canine knee or stifle joints are grouped into extracapsular procedures and intracapsular procedures. Intracapsular procedures require a graft from an adjacent tissue such as the straight patellar tendon or the fascia lata, which is detached from its origin and inserted or repositioned through tunnels bored in the distal femur and/or proximal tibia. This surgery is done inside the joint capsule, with both ends of the transplant being fixed to the walls of the tunnels and/or adjacent bone. Extracapsular procedures use tissues or suture implants placed outside of the joint capsule in order to stabilize the joint.
"Determination of the isometric relationship between location of the origin and location of the insertion of a ligament repair structure forms the foundations of intracapsular surgical repair of ligaments in humans. These same isometric relationships may be determined and used for extracapsular repair of cruciate or other ligament failure in the joints of any mammal. However, current extracapsular surgical procedures have not addressed the optimal placement of transplant tissue or suture at the isometric points.
"What is needed then is a surgical device and procedure for repair of a ligament that provides for the determination of optimal points for the attachment of graft, transplant, or other tissues or tension-bearing materials in an extracapsular procedure."
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventor's summary information for this patent application: "As a first aspect of a method according to the disclosure herein, a device and method for determining spatial relationships in a joint of a mammal comprises obtaining two-dimensional images of the joint in flexed and extended positions, finding a reference point on one bone of the joint and at least approximately locating an isometric point on another bone in the joint by using the two dimensional images, and thereafter using a measuring and positioning device to locate those points in the mammal joint.
"According to another aspect of the disclosure herein a locating and positioning device is provided by means of which a reference point can be marked on a first bone of a joint and an isometric point can be located and verified. As another aspect of the method disclosed the locating and positioning device can be used to aid in establishing a hole in at least the second bone to receive a tissue anchor as part of a graft-forming procedure.
"In accordance with an aspect of the device, the locating and positioning device can be adjusted and fastened to measure spacing between a pair of locating portions.
"As a feature of one embodiment of the device the locating portions are carried as the distal ends of respective area of a pair of arms adjustably pivotable with respect to each other, and at least one of the locating portions is adjustable with respect to the arm on which it is carried.
"In accordance with one aspect of a method of using the locating and positing device one locating portion can be fastened to one of a pair of bones that meet in an articulating joint, and the other locating portion can be moved relative to the first to find and verify the location of an axis of rotation of a joint that can move in a hinge-like fashion, in order to determine where to place an external fixation device for use in supporting such a joint during the process of healing after an injury to the joint.
"The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description, taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
"FIG. 1 is a view of a radiograph of a canine stifle joint in a fully flexed position, showing use of a pair of dividers to measure a distance between respective points on the tibia and femur shown in the radiograph.
"FIG. 2 is a view of a radiograph of the same stifle joint shown in the radiograph depicted in FIG. 1, with the stifle joint in its fully extended position, showing use of a divider to measure between a selected point on the tibia and a point on the femur shown in the radiograph.
"FIG. 3 is an isometric view of a measuring and positioning device which is an exemplary embodiment of one aspect of the present invention.
"FIG. 4 is a top plan view of the device shown in FIG. 3.
"FIG. 5 is a bottom plan view of the device shown in FIG. 3.
"FIG. 6 is an isometric view of a measuring and positioning device which is another exemplary embodiment of an aspect of the disclosure herein.
"FIG. 7 is a side elevational view of the device shown in FIG. 6.
"FIG. 8 is a top plan view of the device shown in FIG. 6.
"FIG. 9 is an elevational view taken from the outer end of the device shown in FIGS. 6, 7, and 8.
"FIG. 10 is an isometric view of a measuring and positioning device which is another embodiment of an aspect of the present invention.
"FIG. 11 is a simplified frontal view of a partially dissected stifle joint of a left leg of a canine, with the skin and other superficial tissue removed for the sake of clarity together with the device shown in FIGS. 3, 4, and 5 in use in connection with surgical repair of the stifle joint.
"FIG. 12 is a simplified lateral view of the stifle joint of the leg shown in FIG. 11, with the skin and other superficial tissue removed for the sake of clarity, and showing the device shown in FIGS. 3, 4, and 5 in use with the stifle in a fully flexed position.
"FIG. 13 is a simplified lateral view of the stifle joint of the left leg of a canine, with the skin and other superficial tissue removed for the sake of clarity, and showing the device shown in FIGS. 3, 4, and 5 in use with the stifle in a fully extended position.
"FIG. 14 is a lateral view of the stifle joint of the left leg of a canine, with skin and other superficial tissues removed for clarity, and showing use of the device shown in FIGS. 3, 4, and 5 in connection with forming an autograft to repair an injury in the joint.
"FIG. 15 is a view of a portion of a stifle joint, showing a tissue anchor in place in the femur and sutures connected with the anchor being used to attach a portion of the fascia lata to the tissue anchor.
"FIG. 16 is a view of the same area of the canine stifle that is shown in FIG. 15, at a subsequent step of the preparation of an autograft as part of a repair procedure.
"FIG. 17 is a rear elevational view of a canine hock, showing use of the device shown in FIGS. 3, 4, and 5 to identify the location of an axis of rotation of the hock joint.
"FIG. 18 is a view of the hock joint and the device shown in FIG. 17, with the device being used to identify the location of the axis of rotation of the hock."
URL and more information on this patent application, see: White,
Keywords for this news article include: Patents, Surgery, Autograft,
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