A modular prosthetic socket design method

Abstract

The present invention relates to a modular prosthetic limb socket design method, belonging to the technical field of prosthetic limb design. S1: constructing a standard socket model including multiple dynamic modules; S2: constructing a residual limb model including bones, muscles, and skin; S3: locating the positions of the dynamic modules one by one according to the best fit method; S4: adjusting the nodes of the dynamic modules so that the surfaces of the dynamic modules and the surfaces of the residual limb model coincide; S5: adjusting the nodes of the dynamic modules. The present invention modularizes and parameterizes the socket and digitizes the residual limb to accurately achieve the fitting of the socket and the mathematical model of the residual limb, strictly following the requirements of mechanics, making the socket design reasonable, accurate, efficient, and highly adaptable, and having high practicality and promotion value.

Description

Technical Field

[0001] The present invention relates to the technical field of prosthetic limb design, and in particular to a modular prosthetic limb socket design method. Background Art

[0002] Prostheses are used to support and assist the patient's residual limbs to achieve the restoration of certain functions. The degree of fit between the prosthetic socket and the shape of the residual limb affects the assistance effect and comfort. At the same time, the stress state when the function is realized must also be taken into account. Therefore, not only the fit problem is considered during design. The existing technology realizes the design of the socket by polishing the plaster model. The main method is: the prosthesis technician observes and touches the residual limb, and polishes the plaster socket by feeling, then applies dye or powder, inserts the residual limb into the socket, takes it out after fitting, and checks whether the color or powder of the socket is uniform. If not, it is repeatedly reshaped until it is uniform. At the same time, it is also necessary to consider the overlap of force lines, interference when the function is realized, and re-polishing of some unnecessary full contact areas to finally complete the modeling.

[0003] While this method ultimately achieves design, it has one significant drawback: it cannot accurately reflect the abnormal bone structure of a particular patient, potentially impacting limb function recovery and comfort. Another issue is the significant manual effort required by experienced technicians. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a modular prosthetic socket design method, which modularizes, parameterizes and digitizes the socket, realizes fitting with the residual limb model through dynamic adjustment of the module, and establishes a socket model to solve the problems of the existing technology that abnormal bone structure cannot accurately reflect the impact on functional realization and requires manual operation by experienced technicians, resulting in low efficiency and poor adaptability.

[0005] The present invention is achieved through the following technical solutions:

[0006] A modular prosthetic socket design method comprises the following steps:

[0007] S1. Construct a standard model of the socket including multiple dynamic modules;

[0008] S2, construct a residual limb model including bones, muscles and skin;

[0009] S3, locating the positions of the dynamic modules one by one according to the best fitting method;

[0010] S4, adjusting the dynamic module nodes to make the dynamic module surface coincide with the residual limb model surface;

[0011] S5. Adjust the nodes of the dynamic module so that the surface of the dynamic module meets the force requirements of the residual limb bones and muscles.

[0012] Furthermore, step 2 employs CT scanning.

[0013] Furthermore, the prosthesis includes an upper limb.

[0014] Furthermore, the prosthesis includes a lower limb.

[0015] Furthermore, the dynamic modules include ten.

[0016] Furthermore, the ten dynamic modules are patellar ligament, tibial crest, fibular head, lateral tibia, medial tibia, lateral femoral condyle, medial femoral condyle, popliteal fossa, hamstrings, and terminal region.

[0017] Furthermore, the bones include femur, tibia, patella, and fibula.

[0018] Furthermore, the dynamic module is a curved thin block, and the curved thin block is provided with a plurality of adjustment nodes.

[0019] The beneficial effects of the present invention are:

[0020] The present invention modularizes the receiving cavity to make it highly repeatable and less affected by human factors. It can be selectively adjusted according to actual conditions without having to adjust all of it. At the same time, the module is parameterized and the parameters are manually adjusted to make its shape adjustable to match the residual limbs of different people. In addition, a residual limb model including bones, muscles and skin is established, with clear positions of bones and muscles and accurate positioning. While taking care of the fit, the overlap of force lines is also considered, which is conducive to functional recovery.

[0021] In summary, the present invention modularizes and parameterizes the receiving cavity and digitizes the residual limb to accurately fit the mathematical model of the receiving cavity and the residual limb, strictly follows the requirements of mechanics, and makes the design of the receiving cavity reasonable, accurate, efficient, and adaptable, with high practicality and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the standard model diagram of the receiving cavity;

[0023] Figure 2 This is the first-person perspective of the dynamic module of the lower leg residual limb;

[0024] Figure 3 This is another perspective of the dynamic module of the lower leg residual limb;

[0025] Figure 4 This is a model diagram of the lower leg stump;

[0026] Figure 5 Extract the module graph for the lower leg residual limb.

[0027] Description of reference numerals:

[0028] 1- socket model; 2- patellar ligament; 3- tibial crest; 4- fibular head; 5- lateral tibia; 6- medial tibia; 7- lateral femoral condyle; 8- medial femoral condyle; 9- popliteal fossa; 10- hamstring muscle; 11- terminal region; 12- residual limb model; 13- node. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the above description of the present invention, it should be noted that the terms "one side," "the other side," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0033] Furthermore, the term "identical" and similar terms do not necessarily require that the components be absolutely identical; slight variations are permitted. The term "perpendicular" simply refers to the positional relationship between components being more perpendicular than "parallel," not that the structure must be perfectly vertical; rather, it can be slightly tilted.

[0034] In order to solve the problems in the background technology and improve the quality of life of patients with residual limbs, the present invention proposes a modular prosthetic socket design method, comprising the following steps:

[0035] S1. Build a standard socket model suitable for a certain weight range with reference to existing socket models. Based on the most clinically relevant areas of the socket, extract multiple curved thin blocks from the corresponding areas of the standard socket model. Set the extracted curved thin blocks as dynamic modules, i.e., adjust them into curved surface blocks defined by a combination of multiple adjustment nodes, parameterize them, and form a dynamic module database by inputting parameters or manually adjusting them, which can be directly called upon when needed.

[0036] S2. Perform a CT scan on the patient's residual limb to obtain the skeleton and external contour information of the residual limb, and set the area between the skeleton and the external contour as muscle and skin, thereby establishing a residual limb model including the skeleton, muscle and skin;

[0037] S3. Retrieve the corresponding module from the database, first locate the module position using the best fit method, then fine-tune it by translation and rotation until it is placed in the appropriate position, completing the positioning operation of the dynamic module. Similarly, complete the positioning of all dynamic modules;

[0038] S4, adjusting the dynamic module nodes to make the dynamic module surface coincide with the residual limb model surface;

[0039] S5. Adjust the dynamic module nodes so that the dynamic module surface and the residual limb bone meet the mechanical requirements.

[0040] The standard socket model of this embodiment can be set in multiple specifications according to weight or height for selection by different groups of people, making it more adaptable.

[0041] The artificial limb of this embodiment can be an upper limb or a lower limb. When it is an upper limb, it particularly refers to the wrist joint area and the elbow joint area; when it is a lower limb, it particularly refers to the knee joint area and the ankle joint area.

[0042] By modularizing the receiving cavity, it is made highly repeatable, with little human influence, and can be selectively adjusted according to actual conditions without having to adjust all of them. At the same time, the module is parameterized and the parameters are manually adjusted to make its shape adjustable to match the residual limbs of different people. In addition, a residual limb model including bones, muscles and skin is established, with clear skeletal muscle positions and accurate positioning. While taking care of the fit, the overlap of force lines is also considered, which is conducive to functional recovery.

[0043] By modularizing and parameterizing the receiving cavity and digitizing the residual limb, the receiving cavity and the mathematical model of the residual limb are accurately fitted, strictly following the requirements of mechanics, making the receiving cavity design reasonable, accurate, efficient, and adaptable, with high practicality, bringing good news to residual limb patients in improving their quality of life.

[0044] The following is an example of a patient with lower leg amputation:

[0045] The patient had a lower-tibial amputation below the knee.

[0046] The first step is to build a cavity model 1, such as Figure 1 As shown;

[0047] In the second step, 10 arc-shaped thin blocks were cut according to the most concerned parts in clinical practice, namely, patellar ligament 2, tibial crest 3, fibular head 4, lateral tibia 5, medial tibia 6, lateral femoral condyle 7, medial femoral condyle 8, popliteal fossa 9, hamstring muscle 10, and terminal area 11, as shown in FIG. Figure 2 As shown, the intercepted 10 arc-shaped thin blocks are set as adjustment surfaces with nodes 13 being 6*6 or 9*9, that is, dynamic modules, forming a dynamic module database;

[0048] The third step is to perform a CT scan on the patient's lower leg stump to obtain information about the femur, tibia, patella, fibula, and external contours. The areas between the femur, tibia, patella, fibula, and external contours are set as muscle and skin, thus establishing a stump model including bones, muscles, and skin.12

[0049] The fourth step is to retrieve the patellar ligament from the database, first locate the module position using the best fit method, and then fine-tune it by translation and rotation until it is placed in the appropriate position. This completes the positioning operation of the patellar ligament. Similarly, the positioning of other dynamic modules is completed.

[0050] Step 5: Adjust the patellar ligament nodes to make the patellar ligament surface coincide with the residual limb model surface. Similarly, complete the adjustment of other modules.

[0051] The sixth step is to adjust the fibular head node so that the fibular head surface is connected to the corresponding area of ​​the residual limb model on all sides, with a certain interval in the middle, which meets the mechanical requirements. Similarly, the adjustment of the terminal area module is completed.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A modular prosthetic socket design method, characterized by: The following steps are involved: S1. Constructing a standard model of a receiving cavity including a plurality of dynamic modules, wherein the dynamic module is a thin arc-shaped block provided with a plurality of adjustment nodes; S2, construct a residual limb model including bones, muscles and skin; S3, locating the positions of the dynamic modules one by one according to the best fitting method; S4, adjusting the dynamic module nodes to make the dynamic module surface coincide with the residual limb model surface; S5. Adjust the nodes of the dynamic module so that the surface of the dynamic module meets the force requirements of the residual limb bones and muscles.

2. The modular prosthetic socket design method according to claim 1, characterized in that: Step 2 uses a CT scan.

3. The modular prosthetic socket design method according to claim 1, characterized in that: The prosthesis includes an upper limb.

4. The modular prosthetic socket design method according to claim 1, characterized in that: The prosthesis includes a lower limb.

5. The modular prosthetic socket design method according to claim 4, characterized in that: The dynamic modules include ten.

6. The modular prosthetic socket design method according to claim 5, characterized in that: The ten dynamic modules are patellar ligament, tibial crest, fibular head, lateral tibia, medial tibia, lateral femoral condyle, medial femoral condyle, popliteal fossa, hamstrings, and terminal region.

7. The modular prosthetic socket design method according to claim 4, characterized in that: The bones include femur, tibia, patella and fibula.

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