The present invention generally relates to anatomical models. The invention particularly relates to anatomical models capable of mimicking articulation of the human skeletal joints, for example, the knee and hip joints.
Orthopaedic demonstration and training models are available which include facsimile human skeletal bones capable of use in surgical education, including surgeries that include bone cutting and orthopaedic prosthesis placement. The quality of such models is generally judged by the extent to which they accurately reproduce their human component counterparts, particularly with relation to properties such as anatomical accuracy, tissue response to interaction with instruments (e.g., needles, scalpels, etc.), and biomechanics. While advances continue to be made in the quality of such models, there is an ongoing desire for more accurate models. In particular, many commercially available models are limited in their ability to accurately replicate the complex kinematics of human skeletal bones, especially for skeletal joints such as the knee (genu) and hip (acetabulofemoral) joints. Therefore, it can be appreciated that it would be desirable if anatomical models were available that were capable of more accurately mimicking the complex kinematics of human skeletal bones.
The intent of this section of the specification is to briefly indicate the nature and substance of the invention, as opposed to an exhaustive statement of all subject matter and aspects of the invention. Therefore, while this section identifies subject matter recited in the claims, additional subject matter and aspects relating to the invention are set forth in other sections of the specification, particularly the detailed description, as well as any drawings.
The present invention provides anatomical models capable of mimicking a range of motion of a human skeletal joint, for example the human knee and hip joints.
According to a nonlimiting aspect of the invention, an anatomical model includes first and second facsimile bone members having adjacent interconnected portions to define a facsimile skeletal joint, and a rod assembly comprising a rod having oppositely-disposed first and second ends. The first end of the rod has a clamping assembly mounted thereto that comprises first and second clamping members for clamping a portion of the first facsimile bone member therebetween. The clamping assembly comprises a clamping mechanism operable to collapse the first and second clamping members toward each other to capture and compress the portion of the first facsimile bone member therebetween and prevent the first facsimile bone member from being removed either axially or transversely from the rod assembly, and operable to expand the first and second clamping members away from each other to release the portion of the first facsimile bone member therebetween and allow the first facsimile bone member to be removed both axially and transversely from the rod assembly.
According to another nonlimiting aspect of the invention, an anatomical model is provided that includes first and second facsimile bone members, upper and lower leg members, first and second ligament members, and a first holding assembly. The first facsimile bone member has a proximal end and a distal end wherein the distal end includes a facsimile distal portion of a human femur. The second facsimile bone member has a proximal end and a distal end wherein the proximal end includes a facsimile proximal portion of a human tibia. The upper leg member is representative of a portion of a human thigh and has proximal and distal ends. The distal end of the first facsimile bone member extends from the distal end of the upper leg member. The lower leg member is representative of a portion of a human lower leg and a human foot and has proximal and distal ends. The proximal end of the second facsimile bone member extends from the proximal end of the lower leg member. The first and second ligament members couple lateral sides of the distal end of the first facsimile bone member to the lateral sides of the proximal end of the second facsimile bone member to at least partially define a knee joint of the anatomical model. The knee joint is configured for articulation that mimics the articulation of the human knee joint. The distal end of the first facsimile bone member and the proximal end of the second facsimile bone member are aligned in a manner that mimics the anatomical alignment of the distal femur and the proximal tibia in the human knee joint during articulation of the knee joint. The first and second ligament members mimic tension properties of the human lateral and medial collateral ligaments during articulation of the knee joint. The first holding assembly is configured to be secured to a fixture, couple with the proximal end of the upper leg member, and provide a range of motion of the upper leg member that mimics the full range of motion of the human hip joint.
According to another nonlimiting aspect of the invention, a method is provided that includes coupling the second end of the first rod assembly to a fixture to provide a range of motion of the first rod assembly that mimics a range of motion of the human hip joint, optionally coupling the second end of the second rod assembly to a fixture to provide a range of motion of the first and second rod assemblies that mimics a range of motion of the human hip joint, and manually manipulating the anatomical model to adjust relative positions of the first facsimile bone member and the second facsimile bone member by articulating at least the first rod assembly to a position within a range of motion of the human hip joint and optionally articulating the second rod assembly to a position within a range of motion of the human knee joint.
Technical effects of anatomical models and methods as described above preferably include the ability to teach and/or practice anatomical, medical, and surgical concepts with accurate kinematics of the human hip and knee joints.
Other aspects and advantages of this invention will be appreciated from the following detailed description.
The intended purpose of the following detailed description of the invention and the phraseology and terminology employed therein is to describe what is shown in the drawings, which include the depiction of one or more nonlimiting embodiments of the invention, and to describe certain but not all aspects of what is depicted in the drawings, including the embodiment(s) depicted in the drawings. The following detailed description also identifies certain but not all alternatives of the embodiment(s) depicted in the drawings. As nonlimiting examples, the invention encompasses additional or alternative embodiments in which one or more features or aspects shown and/or described as part of a particular depicted embodiment could be eliminated, and also encompasses additional or alternative embodiments that combine two or more features or aspects shown and/or described as part of different depicted embodiments. Therefore, the appended claims, and not the detailed description, are intended to recite what are believed to be aspects of the invention, including certain but not necessarily all of the aspects and alternatives described in the detailed description.
Disclosed herein are anatomical models suitable for anatomical and medial education-related activities such as but not limited to surgical training activities that may include bone cutting and orthopaedic prosthesis placement. The models include components representative of various human tissues that are arranged relative to each other in anatomically accurate positions. Some or all of these components may be configured to reproduce certain properties of the human tissues represented thereby, including but not limited to tissue density, texture, color, etc. The models may further include the capability of moving or articulating these components relative to each other in manners which accurately mimic the kinematics of certain skeletal joints of the human body, such as the knee (genu), hip (acetabulofemoral), shoulder (glenohumeral), and/or elbow (articulatio cubiti: humeroulnar, humeroradial, and proximal radioulnar) joints. For convenience, certain aspects of the invention will be hereinafter described in reference to the human leg, including the hip and knee joints and tissues associated therewith. However, it should be understood that the invention is not necessarily limited to such embodiments and that the teachings herein may be more broadly applicable to other portions of the human body or portions of various animal bodies.
As used herein, the phrase “full range of motion” of a human skeletal joint refers to a maximum amount of passive movement (i.e., due to an external force) capable for a specific joint in any direction as limited by the soft and hard tissues associated with the joint and without damaging such soft and hard tissues. Since the full range of motion is based on passive movements, the full range of motion may be in excess of a “normal range of motion” of the specific joint, which is based on active movements (i.e., requiring muscle contraction). Measurements of the full range of motion are generally measured in degrees and may be based on an average human as known in the art. The full range of motion of a joint may be dependent on certain aspects such as sex, age, weight, height, etc. As nonlimiting examples based on typical human capabilities, the full range of motion for the human hip joint may be equal to or greater than 0 to 100 degrees for flexion, 0 to 30 degrees for backward extension, 0 to 40 degrees for abduction, 20 to 0 degrees for adduction, 0 to 60 degrees for lateral rotation (i.e., rotation away from the center of the body), and 0 to 40 degrees for medial rotation (i.e., rotation toward the center of the body) and the full range of motion for the human knee joint may be equal to or greater than 0 to 150 degrees for flexion and 120 to 0 degrees for extension.
Referring to
The upper leg member 22 and the lower leg member 30 are represented in the drawings as releasably supported with first and second holding assemblies 56 and 74, respectively. The first holding assembly 56 is coupled to a proximal end of the upper leg member 22 and configured to provide articulation to the upper leg member 22. Preferably, the first holding assembly 56 is configured to provide a range of motion to the upper leg member 22 that mimics a full range of motion provided by the human hip to the human thigh. The second holding assembly 74 is represented as coupled to a heel 34 of the foot 32 of the lower leg member 30. In the illustrated embodiments, the second holding assembly 74 is preferably capable of providing articulation to the lower leg member 30 to simulate the rolling of a human heel on a surface. Preferably, both of the holding assemblies 56 and 74 are capable of selectively fixing the positions of articulation of the respective leg members 22 and 30. In the embodiments shown in the drawings, the first and second holding assemblies 56 and 74 are configured to fix the position of the upper and/or lower leg members 22 and 30 such that the first and second facsimile bone members 12 and 14 are at proper anatomical orientations for the purpose of performing a surgical orthopaedic procedure. Each of the holding assemblies 56 and 74 may be configured to be rigidly secured to a fixture 100 or other equipment (
In the nonlimiting example of
The mounting rod 70 of the first holding assembly 56 is represented in
The mounting rods 70 and 86 of the first and second holding assemblies 56 and 74 may include distal ends configured to promote ease of insertion and securement within the recesses of the shaft assembly 46 and the lower leg member 30, respectively. In the embodiments represented in
The first and second facsimile bone members 12 and 14 are preferably releasably secured to the upper and lower leg members 22 and 30, respectively. In the nonlimiting embodiment represented in the drawings, the distal end of the upper leg member 22 and the proximal end of the lower leg member 30 include recesses 26 and 36, respectively, configured to receive and releasably secure proximal and distal ends of the first and second facsimile bone members 12 and 14 therein, respectively. In this example, clamping mechanisms 28 and 38 are threadably coupled to the upper and lower leg members 22 and 30 and operable via hand knobs to selectively contact and apply compressive forces on the facsimile bone members 12 and 14 within the recesses 26 and 36 to secure the ends of the facsimile bone members 12 and 14 therein, respectively.
The proximal and distal ends of, respectively, the first and second facsimile bone members 12 and 14 received within the recesses 26 and 36 of the upper and lower leg members 22 and 30, respectively, may have configurations that are facsimile portions of human bones. Alternatively, the proximal and distal ends of the first and second facsimile bone members 12 and 14, respectively, may have configurations that are not facsimile portions of human bones but instead are configured to promote ease of being received and/or secured within the recesses 26 and 36 of the upper and lower leg members 22 and 30. For example, in
As noted previously, the first and second facsimile bone members 12 and 14 are represented as coupled with the first and second ligament members 40 and 42. The first and second ligament members 40 and 42 may be rotatably and releasably or permanently secured with, for example, fasteners 44 to lateral and medial sides of the distal and proximal ends of the first and second facsimile bone members 12 and 14, respectively.
The first and second facsimile bone members 12 and 14 may be configured to couple with one or more additional components (not shown) configured to represent or reproduce other human tissues. In
In the illustrated embodiments, in which the model 10 is intended to be used for practicing surgical techniques, the first and second facsimile bone members 12 and 14 may be further configured to mimic the distal portion of the human femur and the proximal portion of the human tibia, respectively, through an entirety of cross sections of the distal and proximal ends thereof, respectively. For example,
The model 10 provides for a method of performing anatomical and medial education-related activities which may include surgical training activities. The method may include securing one or both of the first and second holding assemblies 56 and 74 to the fixture 100 or other suitable equipment, such as a table. In the illustrated embodiments, the upper leg member 22 is coupled to the first holding assembly 56 by inserting the distal end of the mounting rod 70 thereof into the recess of the shaft assembly 46 and, optionally, securing the mounting rod 70 therein. The lower leg member 30 may optionally be coupled to the second holding assembly 74 by inserting the distal end of the mounting rod 86 thereof into the recess of the heel 34 of the foot 32 and, optionally, securing the mounting rod 86 therein. The distal and proximal ends of the first and second facsimile bone members 12 and 14, respectively, are represented as inserted into and secured within the recesses 26 and 36 of the upper and lower leg members 22 and 30, respectively. In the illustrated embodiments, the first and second ligament members 40 and 42 are represented as disposed at and secured to lateral and medial sides of the distal and proximal ends of the first and second facsimile bone members 12 and 14, respectively.
The model 10 may be manually manipulated to adjust the position of the components thereof relative to one another. In examples in which the lower leg member 30 is not coupled to the second holding assembly 74, the model 10 may be manipulated to articulate the first holding assembly 56 to any position within the full range of motion provided by the human hip joint and to articulate the first and second facsimile bone members 12 and 14 to any position within the full range of motion provided by the human knee joint. In examples in which the lower leg member 30 is coupled to the second holding assembly 74, the model 10 may be manipulated to articulate the second holding assembly 74 to any position within the range of motion provided by rolling the human heel on a surface and to articulate the first holding assembly 56 to any position within the full range of motion provided by the human hip as limited by the limited movement of the lower leg member 30 due to the connection to the second holding assembly 74. The method may include decoupling one or both of the first and second holding assemblies 56 and 74 from the fixture 100 prior to manipulating the model 10 to allow from a broader range of motion relative to the first and second holding assemblies 56 and 74 being secured to the fixture 100. In such examples, manipulating the model 10 may include sliding one or both of the first and second holding assemblies 56 and 74 along the fixture 100.
Once the components of the model 10 are located in desired relative positions, the components may be fixed in such positions with one or more locking mechanisms or fasteners. In some illustrated examples, the upper and lower leg members 22 and 30 are secured to the first and second holding assemblies 56 and 74 and fixed in relative articulatory positions in a manner such that the first and second facsimile bone members 12 and 14 are positioned at proper anatomical orientations for the purpose of performing the anatomical and medial education-related activities, such as but not limited to certain surgical orthopaedic procedures.
Once fixed in the desired orientation, the model 10 may be used to assist in performing the anatomical and medial education-related activities. This may include cutting one or both of the first and second facsimile bone members 12 and 14, detaching and/or reattaching one or both of the first and second ligament members 40 and 42, and/or securing one or more orthopaedic prostheses to the model 10. If the method includes permanently modifying one or more of the components of the model 10 (e.g., the facsimile bone members 12 and 14), the method may further include removing and replacing such components. As such, the model 10 provides the capability for repeatedly performing certain education-related activities without the necessity of replacing an entirety of the model 10 between such activities.
Alternative embodiments are contemplated in addition to the embodiments(s) shown and/or described herein. For example, one or more of the components of the model 10 may be altered or have different constructions than described herein to represent, reproduce, or mimic counterpart human tissue(s) that are damaged or otherwise abnormal due to injury, illness, birth defects, genetic disorder, etc. For example, the first and/or second facsimile bone members 12 and 14 may be configured to represent fractures, deterioration, or other conditions. The first and/or second ligament members 40 and 42 may be configured to represent ligament laxity, partial tear or rupture, or other conditions. Similarly, the range of motion provided by a joint of the model 10 may be adjusted to mimic a corresponding human joint that is capable of more or less than the full or normal range of motion of a corresponding healthy human joint in order to represent a damaged or abnormal human joint (e.g., ligament rupture, inflammation, etc.).
The model 10 and its components may be fabricated using various techniques and formed of various materials including those currently used in the anatomical model industry. Fabrication techniques may include but are not limited to computer numerical control (CNC) milling, laser milling, additive manufacturing, and manual sculpting. Suitable materials may include certain polymeric, metallic, ceramic, and composite materials having various structures and consistencies. Preferably, the materials used for facsimile components are configured to precisely reproduce the feel and/or interaction response of a corresponding human tissue. For example, a facsimile component may reproduce a human tissue response to a working instrument or diagnostic equipment such as a needle, scalpel, staple, ultrasound machine, x-ray machine, or other medical devices and systems. As a specific nonlimiting example, the first and second ligament members 40 and 42 may be formed of a silicone-based polymeric material.
For purposes of illustration, the embodiment represented in
As with previous embodiments of the invention, the first holding assembly 56 utilizes the ball joint assembly 68 to enable anatomically positioning of the rod assembly 146 over three moments of rotation and enable the rod assembly 146 to be fastened/locked statically by a lever 72.
As best seen in
As best seen in
In this embodiment, a mounting assembly 281 allows the anatomical model 210 to be easily mounted to and/or adjusted on a support structure, such as a table and/or a surgical bed (not shown). The mounting assembly 281 is formed by the first holding assembly 256 and the second holding assembly 274 that are permanently mounted to opposite ends of the track 292 and allow positioning and mounting of the anatomical model 210 on the support structure. The first holding assembly 256 is permanently attached to the “femoral/hip cup assembly” end of the track 292, and the second holding assembly 274 is permanently attached to the “talus block assembly” end of the track 292. Handle bars 287 disposed on opposite ends of the track 292 allow ease of placement and removal of the mounting assembly 281 onto a table or surgical bed.
Each of the first and second holding assemblies 256 and 274 includes a mount body 279 that is attached to the track 292 and either of two mounting members, a rail clamp assembly 283 or a table clamp assembly 285, that can be interchangeably attached to the mount body 279 to allow the holding assemblies 256 and 274 to be mounted to either a table edge (table clamp assembly 285) or a rail (rail clamp assembly 283). As best seen in
The talus block assembly 290 is slidably mounted on the track 292 extending between the first and second holding assemblies 256 and 274 such that it can slide along the track 292 between the first and second holding assemblies 256 and 274. As best seen in
The first holding assembly 256 includes a femoral/hip cup assembly configured to mimic an actual femur/hip joint, such as that shown for example in
As previously noted above, though the foregoing detailed description describes certain aspects of one or more particular embodiments of the invention, alternatives could be adopted by one skilled in the art. For example, the models 10, 110, and 210 and their components could differ in appearance and construction from the embodiments described herein and shown in the figures, functions of certain components of the models 10, 110, and 210 could be performed by components of different construction but capable of a similar (though not necessarily equivalent) function, and various materials could be used in the fabrication of the models 10, 110, and 210 and/or their components. As such, and again as was previously noted, it should be understood that the invention is not necessarily limited to any embodiment described herein or illustrated in the drawings.
This application claims the benefit of U.S. Provisional Application No. 63/322,973 filed Mar. 23, 2022, and the benefit of U.S. Provisional Application No. 63/381,402 filed Oct. 28, 2022. The contents of these prior applications are incorporated herein by reference.
Number | Date | Country | |
---|---|---|---|
63322973 | Mar 2022 | US | |
63381402 | Oct 2022 | US |