An endoprosthesis connector for reconstruction of a stump of a hemipelvectomy patient
By designing an internal prosthetic connector suitable for patients with hemipelvic amputations, and employing multiple fixation mechanisms and an adjustable design, the problem of residual function reconstruction in patients with hemipelvic amputations has been solved, restoring limb function and improving their quality of life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- PEOPLES HOSPITAL PEKING UNIV
- Filing Date
- 2026-02-09
- Publication Date
- 2026-06-05
AI Technical Summary
Current technology cannot effectively reconstruct the residual function of patients with hemipelvic amputation, resulting in patients being unable to achieve basic functions such as balanced sitting and standing independently.
An integrated prosthesis connector was designed, including a prosthesis base, a first conical connector, and a second conical connector. Through multiple fixation mechanisms and an adjustable design, it can adapt to the pelvic stump after hemipelvic amputation, achieving effective connection and functional recovery.
It enables the connection of an internal prosthesis for patients with hemipelvic amputation, restoring some limb function, significantly improving quality of life, and reducing the risk of prosthesis loosening and infection.
Smart Images
Figure CN122140423A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of medical device technology, and more specifically, it relates to an internal prosthetic connector for stump reconstruction in patients with hemipelvic amputation. Background Technology
[0002] Amputation, as a surgical treatment to remove limbs that have lost their vitality or whose lives are severely threatened by local diseases, directly impacts the patient's quality of life through postoperative stump functional reconstruction. In the human musculoskeletal system, skeletal muscle contraction provides the power for movement, bones act as levers, and joints serve as the pivots of movement; these three work together to complete various motor functions. For amputees, the compensatory function after wearing a prosthesis relies on the residual limb's muscle strength as the power source, while the residual limb itself acts as the active part of movement and a lever structure, achieving motor function through coordinated movements with the prosthesis. Therefore, an ideal residual limb should have appropriate length and good soft tissue coverage to ensure sufficient leverage and muscle control strength; simultaneously, it should retain the physiological function of the remaining joints, have no tenderness or bony deformities at the stump, and have good skin condition.
[0003] The pelvis, as a key structure connecting the spine and lower limbs, is responsible for transmitting the weight of the trunk to the lower limbs. It serves as the biomechanical transfer center during sitting and walking, playing a crucial role in supporting the trunk and maintaining balance in a sitting position. The pelvis is formed by the sacrococcygeal vertebrae and the bilateral iliac bones through the sacroiliac joint to form the posterior ring, and by the anterior ring formed by the pubic symphysis. Its main functions include bearing and transmitting body weight, protecting pelvic organs, and providing attachment points for muscles.
[0004] Although advancements in neoadjuvant chemotherapy and surgical techniques have enabled most pelvic tumor patients to achieve good prognoses through limb-sparing treatment, hemipelvic amputation remains the standard and often the only surgical option for addressing these clinical problems, particularly in cases of tumor recurrence, large tumors invading one side of the pelvis and major blood vessels and nerves of the lower limb, severe infections that are difficult to control, and pelvic destruction caused by high-energy trauma.
[0005] In the field of limb stump reconstruction, traditional cavity-type prostheses achieve force transmission and functional compensation through the containment relationship between the stump and the prosthesis socket. In recent years, significant progress has been made in in-situ prosthesis connector technology, with representative solutions including Sweden's OPRA (Osseointegrated Prosthesis for the Rehabilitation of Amputees), the UK's OPL (Osseointegrated Prosthetic Limb), and the US's Compress system. The design principles of these existing solutions are all based on the press-fitting and anchoring of the connector's medullary needle to the patient's residual tubular medullary cavity to achieve osseointegration, and then connecting to the external prosthesis via the connector's percutaneous end. This design can improve the coordination between the patient's gait speed and the prosthesis's swing speed, effectively improving stump function.
[0006] However, for patients with hemipelvic amputations, stump reconstruction faces drastically different anatomical and technical challenges: First, there is no tubular stump after a hemipelvic amputation, making it impossible to use the most widely used cavity-type prostheses; second, due to the loss of the hip joint and iliopsoas muscle power system, existing prostheses cannot maximize the original limb function; third, existing built-in prosthesis connectors rely on mechanical riveting to the tubular medullary cavity, while the pelvic stump after a hemipelvic amputation lacks the tubular bone structure available for riveting the prosthesis's medullary nail, rendering existing techniques such as OPRA, OPL, and Compress unsuitable for stump reconstruction after hemipelvic amputations. These technical limitations prevent patients from achieving basic postoperative functions such as balanced sitting and standing, severely impacting their quality of life.
[0007] To date, no reports have been found in patent or non-patent literature regarding built-in prosthetic connectors or osseointegrated prostheses that can be used for functional reconstruction of limb stumps after hemipelvic amputation. Therefore, developing novel prosthetic devices that can adapt to the anatomical characteristics of non-tubular bone stumps and achieve effective fixation and percutaneous connection of the pelvic stumps to address the reconstruction of sitting balance and standing function in hemipelvic amputation patients has become an urgent clinical technical challenge in this field. Summary of the Invention
[0008] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides an internal prosthetic connector for stump reconstruction in patients with hemipelvic amputations, aiming to solve the technical problem in the prior art where patients with hemipelvic amputations cannot effectively reconstruct stump function.
[0009] To achieve the above objectives, the present invention adopts the following technical solution: an internal prosthesis connector for stump reconstruction in patients with hemipelvic amputation, comprising: a prosthesis base, which is the basic component of the entire internal prosthesis connector and serves to connect the stump bone bed and other components; the distal end of the prosthesis base extends vertically to form a first conical handle; a first conical body, the proximal end of which is conically connected to the distal end of the prosthesis base, the distal end of which extends along the sacroiliac force line to form a second conical handle; and a second conical body, which is conically connected to the distal end of the first conical body, the distal end of which is connected to the distal prosthesis via a prosthesis adapter.
[0010] Preferably, a revolute joint is formed between the proximal end of the first conical connector and the distal end of the prosthesis base, such that the first conical connector can rotate on the prosthesis base along a vertical axis to adjust the flexion-extension position of the distal prosthesis connection.
[0011] Preferably, the device further includes a first tapered screw for locking the first tapered body to the prosthesis base, and the first tapered screw penetrates the prosthesis base vertically to press and fix the prosthesis base to the large segment of bone.
[0012] Preferably, a rotational joint is also formed between the proximal end of the second conical connector and the distal end of the first conical connector, so that the second conical connector can rotate along the sacroiliac force line on the first conical connector to adjust the internal and external positions of the distal prosthesis connection.
[0013] Preferably, it also includes a second tapered screw, which is screwed into the second tapered body and the first tapered body along the direction of the sacroiliac force transmission line to achieve secondary pressure fixation of the prosthesis base.
[0014] Preferably, two universal screws are installed on the proximal outer side of the prosthesis base. The spherical head of the universal screw can rotate freely in the groove of the prosthesis base to achieve multi-directional fixation. The two universal screws are connected and locked to the pedicle screws by titanium rods.
[0015] Preferably, the prosthesis base is provided with multiple fixing holes for installing compression screws, and the multiple compression screws securely fix the prosthesis base to the residual bone bed through compression fitting.
[0016] Preferably, the interface between the prosthesis base and the bone is processed into a dense metal porous structure using 3D printing technology.
[0017] Preferably, the prosthesis base adopts an L-shaped structure that can fit snugly against the residual bone bed.
[0018] The present invention has the following advantages due to the adoption of the above technical solutions:
[0019] 1. A pioneering solution to the problem of stump reconstruction in patients with hemipelvic amputation. Unlike existing technologies such as OPRA, OPL, and Compress, which are only applicable to limb stump reconstruction after long tubular bone amputations, this invention is specifically designed to address the pelvic stump reconstruction problem in patients after hemipelvic amputations, filling a technological gap in this field both domestically and internationally. This targeted design enables hemipelvic amputees to achieve, for the first time, an effective connection between the built-in prosthetic connector and the amputation stump, thereby restoring some limb function, regaining the ability to bear weight, and significantly improving their quality of life.
[0020] 2. Innovative design of multiple fixing mechanisms This invention employs a triple fixation mechanism—vertical compression fixation, sacroiliac force line compression fixation, and spinal connection—to provide comprehensive mechanical support and reduce the risk of prosthesis loosening.
[0021] 3. Adjustable design During the procedure, the specific position of the prosthesis connection, i.e., the anterior-posterior or lateral position of the lower limb, can be adjusted by loosening the first and second tapered screws. This adjustability allows the surgeon to make personalized adjustments according to the patient's specific situation, optimize the functional effect of the prosthesis, and improve patient satisfaction. Attached Figure Description
[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the built-in prosthesis connector provided in an embodiment of the present invention; Figure 2 This is a side view of the built-in prosthesis connector provided in this embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the application of the built-in prosthesis connector provided in this embodiment of the invention in the human pelvic region. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.
[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0029] This invention provides an internal prosthetic connector for stump reconstruction in patients with hemipelvic amputations, comprising: a prosthesis base, which is the basic component of the entire internal prosthetic connector and serves to connect the stump bone bed and other components; the distal end of the prosthesis base extends vertically to form a first conical handle; a first conical body, the proximal end of which tapers to the distal end of the prosthesis base, the distal end of which extends along the sacroiliac line to form a second conical handle; and a second conical body, which tapers to the distal end of the first conical body, the distal end of which connects to the distal prosthesis via a prosthetic adapter. This invention enables hemipelvic amputees to achieve an effective connection between the internal prosthetic connector and the amputation stump for the first time, thereby restoring some limb function, regaining weight-bearing ability, and significantly improving their quality of life.
[0030] The following is a detailed description, with reference to the accompanying drawings, of the built-in prosthetic connector for stump reconstruction in patients with hemipelvic amputation provided by an embodiment of the present invention.
[0031] Please see Figures 1 to 3 This embodiment provides an internal prosthesis connector for stump reconstruction in patients with hemipelvic amputation, comprising: a prosthesis base 1, which is the basic component of the entire internal prosthesis connector and serves to connect the stump bone bed and other components; the distal end of the prosthesis base 1 extends vertically to form a first conical handle; a first conical body 2, the proximal end of which is conically connected to the distal end of the prosthesis base 1; the distal end of the first conical body 2 extends along the sacroiliac line to form a second conical handle; and a second conical body 3, which is conically connected to the distal end of the first conical body 2; the distal end of the second conical body 3 is connected to the distal prosthesis (not shown in the figure) via a prosthesis adapter.
[0032] In the above embodiments, preferably, a rotating joint is formed between the proximal end of the first conical connector 2 and the distal end of the prosthesis base 1, so that the first conical connector 2 can rotate on the prosthesis base 1 along the vertical axis to adjust the flexion and extension position of the distal prosthesis connection; it also includes a first conical screw 4 for locking the first conical connector 2 to the prosthesis base 1, and the first conical screw 4 penetrates the prosthesis base 1 in the vertical direction to press and fix the prosthesis base 1 to the large segment of bone vertically.
[0033] In the above embodiments, preferably, a revolute joint is also formed between the proximal end of the second conical connector 3 and the distal end of the first conical connector 2, allowing the second conical connector 3 to rotate along the sacroiliac force line on the first conical connector 2 to adjust the internal and external positions of the distal prosthesis connection; it also includes a second conical screw 5, which is screwed into the second conical connector 3 and the first conical connector 2 along the sacroiliac force line transmission direction to achieve secondary pressure fixation of the prosthesis base. Thus, the dual adjustability of the first conical connector 2 and the second conical connector 3 allows the surgeon to make personalized adjustments according to the patient's specific situation, optimizing the functional effect of the distal prosthesis.
[0034] In the above embodiments, preferably, two universal screws 6 are installed on the proximal outer side of the prosthesis base 1. The spherical head of the universal screw 6 can rotate freely in the groove of the prosthesis base 1 to achieve multi-directional fixation. The two universal screws 6 are connected and locked to the pedicle screws 8 through the titanium rod 7. This connection method realizes the stable connection between the prosthesis base 1 and the spine, provides additional mechanical support for the prosthesis base 1, and realizes the early stability of the prosthesis base 1.
[0035] In the above embodiments, preferably, the interface between the prosthesis base 1 and the bone is processed into a dense metal porous structure using 3D printing technology. When the amputation stump muscle is fixed to the prosthesis connector, the soft tissue such as muscle can grow into the metal pores, forming a blood-rich bioactive layer on the surface of the prosthesis connector. This bioactive layer can reduce the risk of implant infection and reduce the stimulation of the skin tissue by the prosthesis connector deep in the skin, thereby reducing the problem of prosthesis connector wound complications.
[0036] In the above embodiments, preferably, the prosthesis base 1 is provided with multiple fixing holes for installing compression screws 9. The multiple compression screws 9 firmly fix the prosthesis base 1 to the residual bone bed through compression fitting, thereby increasing the long-term healing of the prosthesis base 1 and the residual bone bed.
[0037] In the above embodiments, preferably, the prosthesis base 1 adopts an L-shaped structure that can fit closely to the residual bone bed to reduce the volume of the prosthesis base and thus reduce the risk of infection.
[0038] This invention employs a staged surgical approach for stump reconstruction after hemipelvic amputation. The first stage involves hemipelvic amputation, followed by bony reconstruction of the remaining femur or tibia according to the degree of pelvic structural defects, providing a prerequisite for the second-stage prosthesis placement. Simultaneously, the blood supply to the gluteal flap can be observed after the amputation to determine the timing of the second-stage surgery. It is recommended that the second-stage surgery be performed 6-8 weeks after the first-stage surgery, once CT scans show significant bone healing at the pelvic stump. In the second-stage surgery, the prosthesis base 1 is fixed perpendicularly to the large bone segment using a first tapered screw 4, while a second tapered screw 5 is screwed in along the sacroiliac force line for secondary pressure fixation. This dual fixation method ensures the initial stability of the prosthesis base 1, creating favorable conditions for subsequent osseointegration.
[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. An internal prosthetic connector for stump reconstruction in patients with hemipelvic amputation, characterized in that, include: The prosthesis base is the basic component of the entire built-in prosthesis connector, which is responsible for connecting the residual bone bed and other components. The distal end of the prosthesis base extends vertically to form a first conical handle. A first conical connector, the proximal end of which is conically connected to the distal end of the prosthesis base, and the distal end of the first conical connector extending along the sacroiliac force line to form a second conical handle; The second conical connector is located at the distal end of the first conical connector, and the distal end of the second conical connector is connected to the distal prosthesis via a prosthesis adapter.
2. The built-in prosthetic connector according to claim 1, characterized in that, A revolute joint is formed between the proximal end of the first conical connector and the distal end of the prosthesis base, such that the first conical connector can rotate on the prosthesis base along a vertical axis to adjust the flexion-extension position of the distal prosthesis connection.
3. The built-in prosthetic connector according to claim 2, characterized in that, It also includes a first tapered screw for locking the first tapered body to the prosthesis base, and the first tapered screw penetrates the prosthesis base vertically to press and fix the prosthesis base to the large segment of bone.
4. The built-in prosthetic connector according to claim 3, characterized in that, A rotational joint is also formed between the proximal end of the second conical connector and the distal end of the first conical connector, so that the second conical connector can rotate along the sacroiliac force line on the first conical connector to adjust the internal and external position of the distal prosthesis connection.
5. The built-in prosthetic connector according to claim 4, characterized in that, It also includes a second tapered screw, which is screwed into the second tapered body and the first tapered body along the direction of the sacroiliac force transmission line to achieve secondary pressure fixation of the prosthesis base.
6. The built-in prosthetic connector according to claim 1, characterized in that, Two universal screws are installed on the proximal outer side of the prosthesis base. The spherical head of the universal screw can rotate freely in the groove of the prosthesis base to achieve multi-directional fixation. The two universal screws are connected and locked to the pedicle screws by titanium rods.
7. The built-in prosthetic connector according to claim 1, characterized in that, The prosthesis base is provided with multiple fixing holes for installing compression screws. The multiple compression screws securely fix the prosthesis base to the residual bone bed through a pressing action.
8. The built-in prosthetic connector according to any one of claims 1 to 7, characterized in that, The interface between the prosthesis base and the bone is processed into a dense metal porous structure using 3D printing technology.
9. The built-in prosthetic connector according to any one of claims 1 to 7, characterized in that, The prosthesis base adopts an L-shaped structure that can fit snugly against the residual bone bed.