A humeral support device

Abstract

This invention provides a humeral support device, relating to the field of medical devices. The support device includes a first support portion, a second support portion, and a connecting portion, with the first and second support portions fixedly connected via the connecting portion. The first support portion has multiple first through holes, and the second support portion has multiple second through holes. A first fastener secures the first support portion to the lesser tubercle of the humerus through the first through holes, and a second fastener secures the second support portion to the anteromedial aspect of the humerus through the second through holes. The implantation direction of the first and / or second fasteners intersects the plane of motion of the humerus rotating about the sagittal axis relative to the shoulder joint. By limiting the implantation direction of the fasteners to intersect with the direction of the rotator cuff traction force, it can directly support the medial aspect of the humerus and effectively resist the humeral inversion force caused by the rotator cuff, reducing the risk of secondary humeral displacement caused by rotator cuff traction and improving postoperative stability.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a support device for the humerus. Background Technology

[0002] Humeral fractures are a common type of fracture in clinical practice, especially in the elderly and patients with high-energy trauma. Proximal humeral fractures, in particular, involve key anatomical structures such as the humeral head, greater tuberosity, lesser tuberosity, and humeral metaphysis, significantly impacting shoulder joint function and making treatment more challenging. Conservative treatment can be used for fractures with minimal displacement or stability, but surgical intervention is usually required for fractures with significant displacement or instability.

[0003] Currently, commonly used internal fixation methods in clinical practice include locking plates and intramedullary nails, among which locking plates have become the main treatment method due to their strong fixation ability and wide applicability. However, existing locking plates still have certain limitations in application, such as insufficient fixation strength, postoperative loss of reduction, and insufficient medial support. Especially in cases of medial comminuted fracture, additional autologous or allogeneic bone grafting is required to enhance support, but this may bring additional trauma or infection risks. Utility Model Content

[0004] The purpose of this application is to provide a humeral support device that addresses at least one of the aforementioned existing technical problems. By defining the implantation direction of the fastener as intersecting with the direction of the rotator cuff traction force, it can directly support the medial humeral distance and effectively resist the humeral inversion force caused by the rotator cuff.

[0005] This application provides a support device for the humerus, the support device including a first support part, a second support part and a connecting part, wherein the first support part and the second support part are fixedly connected by the connecting part;

[0006] The first support portion is provided with a plurality of first through holes, and the second support portion is provided with a plurality of second through holes. The first fastener fixes the first support portion to the lesser tubercle of the humerus through the first through holes, and the second fastener fixes the second support portion to the anteromedial side of the humerus through the second through holes.

[0007] The implantation directions of the first fastener and / or the second fastener intersect the plane of motion of the humerus rotating about the sagittal axis relative to the shoulder joint.

[0008] In a possible implementation, the first support portion has a first contact surface, and the second support portion has a second contact surface;

[0009] The first contact surface and the second contact surface are disposed facing the humerus, the first contact surface and the second contact surface are arc-shaped, and the first contact surface and the second contact surface can fit against the humerus.

[0010] In a possible implementation, the connecting portion is a strip-shaped structure, and the width of at least one of the first support portion and the second support portion is greater than the width of the connecting portion.

[0011] In a possible implementation, the included angle between the first support portion and the second support portion is 30°-50°.

[0012] In a possible implementation, the first support portion and / or the second support portion are arc-shaped structures.

[0013] In a possible implementation, the first support portion, the second support portion, and the connecting portion are integrally formed.

[0014] In a possible implementation, the length of the first support portion is less than or equal to the length of the second support portion.

[0015] In a possible implementation, the diameter of the first through hole is the same as the diameter of the second through hole.

[0016] In a possible implementation, the support device includes at least one of the following features:

[0017] Multiple first through holes are evenly spaced on the first support portion;

[0018] Multiple second through holes are evenly spaced on the second support portion.

[0019] In a possible implementation, the support device includes at least one of the following features:

[0020] The length of the support device along the direction from the proximal end to the distal end of the humerus is 20mm-80mm;

[0021] The length of the support device along the direction from the medial side of the humerus to the lateral side of the humerus is 8.0-10.0 mm;

[0022] The thickness of the support device is 1.2-2.5 mm.

[0023] The humeral support device provided in this application has the following beneficial effects:

[0024] This application provides a humeral support device, comprising a first support portion, a second support portion, and a connecting portion. The first and second support portions are fixedly connected via the connecting portion. The first support portion has multiple first through holes, and the second support portion has multiple second through holes. A first fastener is fixedly connected to the lesser tubercle of the humerus via the first through holes, and a second fastener is fixedly connected to the anteromedial aspect of the humerus via the second through holes. The implantation direction of the first and / or second fasteners intersects the plane of motion of the humerus rotating about the sagittal axis relative to the shoulder joint. By limiting the implantation direction of the fasteners to intersect with the direction of the rotator cuff traction force, the device can directly support the medial aspect of the humerus and effectively resist the humeral inversion force caused by the rotator cuff, reducing the risk of secondary humeral displacement caused by rotator cuff traction and improving postoperative stability. Attached Figure Description

[0025] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the support device in an embodiment of the present utility model;

[0027] Figure 2 This is a first-view structural schematic diagram of the support device in an embodiment of this utility model;

[0028] Figure 3 This is a second-view structural schematic diagram of the support device in an embodiment of this utility model;

[0029] Figure 4 This is a schematic diagram of the support device in an embodiment of the present utility model;

[0030] Figure 5 This is a structural schematic diagram of the support device in an embodiment of this utility model.

[0031] The following is supplementary explanation of the attached figures:

[0032] 1. First support part; 11. First through hole; 2. Second support part; 21. Second through hole; 22. Second contact surface; 3. Connecting part; 4. Lesser tubercle of humerus. Detailed Implementation

[0033] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] As used herein, "an embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of this application, it should be understood that the terms "upper," "lower," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] The following describes a humeral support device provided in the embodiments of this application with reference to the accompanying drawings. This support device is particularly suitable for applications involving the treatment of proximal medial humeral fractures.

[0036] The following describes a humeral support device provided in the embodiments of this application with reference to the accompanying drawings. This support device is particularly suitable for applications involving the treatment of proximal medial humeral fractures.

[0037] Please refer to Figures 1-5 This application provides a humeral support device, comprising a first support portion 1, a second support portion 2, and a connecting portion 3. The first support portion 1 and the second support portion 2 are fixedly connected by the connecting portion 3. The first support portion 1 is provided with a plurality of first through holes 11, and the second support portion 2 is provided with a plurality of second through holes 21. A first fastener is fixedly connected to the lesser tubercle 4 of the humerus through the first through holes 11, and a second fastener is fixedly connected to the anteromedial aspect of the humerus through the second through holes 21. The implantation direction of the first fastener and / or the second fastener intersects the plane of motion of the humerus rotating about the sagittal axis relative to the shoulder joint. By limiting the implantation direction of the fastener to intersect with the direction of the rotator cuff traction force, it can directly support the medial aspect of the humerus and effectively resist the humeral inversion force caused by the rotator cuff, reducing the risk of secondary humeral displacement caused by rotator cuff traction and improving postoperative stability.

[0038] Understandably, a proximal humeral fracture refers to a fracture occurring at the proximal end of the humerus, which is close to the shoulder joint. Proximal humeral fractures involve structures such as the humeral head, greater tuberosity, lesser tuberosity, and metaphysis. Proximal humeral fractures in the elderly and osteoporotic patients are often caused by low-energy trauma, while those in younger individuals are often caused by high-energy trauma. For stable, eversion-type proximal humeral fractures, conservative treatment can be used. However, unstable proximal humeral fractures with significant displacement often require surgical treatment. Surgical treatment options vary depending on the degree of fracture comminutedness and bone quality, including plates, intramedullary nails, hemi-shoulder replacement, and reverse shoulder replacement. Intramedullary nailing effectively addresses the deficiency of insufficient support in medial comminuted fractures. However, intramedullary nailing requires a high level of surgical skill and is currently mainly used for two-part fractures. For severely comminuted three- or four-part fractures, plate treatment remains the primary method and is currently the most widely used surgical treatment for proximal humeral fractures, although some problems and challenges still exist.

[0039] Specifically, traditional lateral locking plates for the proximal humerus have the following design flaws in the treatment of proximal humeral fractures: First, the direction of the plate screws is consistent with the direction of the varus stress after the proximal humeral fracture, which is difficult to effectively counteract the varus stress after fracture reduction. Therefore, in some cases, there is loss of reduction after plate fixation, which manifests as aggravation of varus deformity of the proximal humerus. Secondly, the plate is placed on the lateral side of the proximal humerus. For comminuted proximal humeral fractures with medial distal humeral spurs, existing solutions often use autologous or allogeneic iliac or fibular bone grafts to address the problem of insufficient medial support. Bone grafting may bring additional damage or risks associated with allogeneic bone grafting. Existing solutions also lack a fixation plate specifically designed to conform to the anatomy of the medial proximal humerus. To address the shortcomings of traditional PHILOS plates for proximal humeral fixation, some solutions employ double-plate techniques to add a medial support plate to the medial humerus, such as distal radius fixation plates, reconstruction plates, and T-plates. However, based on current clinical reports, the medial support plates used are not specifically designed to conform to the anatomy of the medial humerus.

[0040] Specifically, the first and second fasteners are medical screws, the first through hole 11 and the second through hole 21 are locking holes, the first support part 1 is fixed to the lesser tubercle of the humerus 4, and the first fastener enhances the holding force, providing a proximal fixation point for the device, and the second support part 2 is fixed to the anteromedial side of the humerus, providing medial support, preventing the fracture ends from sinking, and resisting the rotator cuff traction force.

[0041] Specifically, when the humerus rotates in the coronal plane relative to the shoulder joint around the sagittal axis, i.e. during abduction and adduction of the humerus, the rotator cuff tissue exerts a traction force on the humerus. The implantation direction of the first fastener and / or the second fastener is relative to the direction of the traction force.

[0042] Preferably, the implantation direction of the first fastener and / or the second fastener is perpendicular to the plane of motion of the humerus rotating about the sagittal axis relative to the shoulder joint.

[0043] Specifically, such as Figure 2 and Figure 3 As shown, the first support portion 1 has a first contact surface, and the second support portion 2 has a second contact surface 22. The first and second contact surfaces 22 are oriented towards the humerus, and both are arc-shaped, allowing them to conform closely to the humerus. This conforming arc-shaped structure reduces the gap between the support device and the bone, creating a more stable contact and lowering the risk of rotation, slippage, or loosening of the support device during or after surgery. The larger contact area effectively disperses stress, preventing localized stress concentration, thereby reducing the risk of bone damage at the screw fixation point and improving long-term fixation.

[0044] Specifically, the first contact surface has a first curvature that matches the anatomical shape of the lesser tubercle of the humerus 4; the second contact surface 22 has a second curvature that matches the anatomical shape of the medial side of the humeral shaft.

[0045] Specifically, in the embodiments of this specification, the connecting part 3 is a strip-shaped structure, and the width of at least one of the first supporting part 1 and the second supporting part 2 is greater than the width of the connecting part 3. Thus, the elongated strip-shaped structure of the connecting part 3 allows for personalized shaping and adjustment during surgery according to the patient's fracture morphology and skeletal anatomy, making the support device fit the proximal humerus more closely and improving the fixation effect.

[0046] Preferably, the connecting part 3 has a long and thin strip-shaped structure.

[0047] Specifically, the connecting part 3 does not have a fastener through hole.

[0048] Specifically, the included angle between the first support portion 1 and the second support portion 2 is 30°-50°. In this way, the first support portion 1 is fixed to the lesser tubercle 4 of the humerus, and the second support portion 2 is fixed to the anteromedial side of the humerus, forming a reliable triangular support structure. This structure effectively supports the humerus, prevents further collapse of the humerus, and better adapts to the biomechanical structure of the humerus, resulting in a more even distribution of force on the implant, reducing stress concentration, and lowering the risk of postoperative implant loosening or fracture re-displacement.

[0049] Specifically, the extension direction of the connecting part 3 is consistent with the extension direction of the second support part 2, and the included angle between the first support part 1 and the connecting part 3 is 30°-50°.

[0050] Specifically, the support device formed by the first support part 1, the connecting part 3, and the second support part 2 is "7-shaped".

[0051] Specifically, the first support portion 1 and / or the second support portion 2 are arc-shaped structures. The arc-shaped support portion can better wrap around and support the medial talus region of the humerus, providing more even stress support during fracture healing, preventing postoperative displacement or collapse of the fracture ends, and improving the stability of medial fixation. The arc-shaped structure conforms more closely to the bone and does not form protruding edges, thereby reducing irritation to surrounding soft tissues, decreasing postoperative foreign body sensation, and improving patient comfort.

[0052] In one embodiment, both the first support portion 1 and the second support portion 2 are arc-shaped structures, and the inner and outer edges of the first support portion 1 and the second support portion 2 are arc-shaped structures.

[0053] Specifically, the first support part 1, the second support part 2, and the connecting part 3 are integrally formed. In this way, the integrally formed support device has high overall strength, can transmit the load more evenly when under stress, improve the stability of the support device when fixing proximal humeral fractures, and reduce the risk of deformation or loosening due to long-term use.

[0054] Specifically, the support device is made of titanium alloy.

[0055] In one embodiment, the support device includes a first support for the left humerus and a second support for the right humerus, the first and second supports being axially symmetrically arranged, and the molds for the first and second supports being axially symmetrically arranged.

[0056] Specifically, the length of the first support portion 1 is less than or equal to the length of the second support portion 2. Since the bone in the lesser tubercle region is relatively small, and the anteromedial support portion needs to provide greater stress support, the shorter length of the first support portion 1 reduces interference with the rotator cuff tissue, while the longer length of the second support portion 2 helps to enhance the overall fixation stability of the support device and improve the mechanical properties of the medial humeral support.

[0057] In one embodiment, the spacing between adjacent first through holes 11 of the first support portion 1 is the same as the spacing between adjacent second through holes 21 of the second support portion 2.

[0058] Specifically, the first support part 1 is provided with four first through holes 11, and the second support part 2 is provided with five second through holes 21.

[0059] Specifically, the diameter of the first through hole 11 is the same as the diameter of the second through hole 21. In this way, the uniform hole diameter reduces the problem of fastener specification matching, avoids the error of screw selection due to different hole diameters, improves the success rate of implantation, and eliminates the need for operators to frequently change screws of different specifications during the operation, reducing operation steps, improving surgical efficiency, and shortening operation time.

[0060] Specifically, the first through hole 11 and the second through hole 21 are both circular through holes, and the first fastener and the second fastener are standard medical fasteners.

[0061] Specifically, the support device includes at least one of the following features:

[0062] Multiple first through holes 11 are evenly spaced on the first support part 1; multiple second through holes 21 are evenly spaced on the second support part 2. The evenly spaced through holes allow the fasteners to be more evenly distributed on the bone tissue during fixation, avoiding excessive load on a single area and reducing the risk of fractures or deformation of the support device caused by stress concentration.

[0063] Understandably, for patients with comminuted fractures or severe bone defects, fasteners cannot be effectively implanted in certain areas, and multiple evenly distributed through holes provide more available fixation options, improving the applicability of the support device under different surgical conditions.

[0064] In one embodiment, the number of first fasteners and first through holes 11 are the same, and the number of second fasteners and second through holes 21 are the same.

[0065] Specifically, the support device includes at least one of the following features:

[0066] The length of the support device along the proximal to distal humerus is 20mm-80mm; the length along the medial to lateral aspect of the humerus is 8.0-10.0mm; and the thickness of the support device is 1.2-2.5mm. In this way, the support device can adapt to different fracture extents, balancing stability and minimal invasiveness, while also reducing interference with soft tissues, ensuring sufficient support strength for the humerus, and improving postoperative comfort.

[0067] Specifically, the length of the support device along the humerus from the end near the shoulder joint to the end near the elbow joint is 20mm-80mm, the length of the support device along the side near the body centerline to the side away from the body centerline is 8.0-10.0mm, the length of the support device along the side near the body centerline to the side away from the body centerline is 8.0-10.0mm, the length of the first support part 1 is 8.0mm-10.0mm, and the sum of the lengths of the second support part 2 and the connecting part 3 is 20mm-80mm.

[0068] Preferably, the length of the support device along the proximal to distal end of the humerus is 30mm-60mm.

[0069] Specifically, the thickness of at least one of the first support portion 1 or the second support portion 2 is less than the thickness of the connecting portion 3.

[0070] The following describes the working process of the humeral support device in a preferred embodiment of this application, using a specific application scenario as an example:

[0071] S1, Perform pre-implantation preparation and expose the proximal medial structures of the humerus;

[0072] S2, the support device is placed on the medial side of the proximal humerus, the first support part 1 fits the region of the lesser tubercle 4 of the humerus, the second support part 2 fits the anteromedial region of the humerus, and the connecting part 3 crosses the medial side of the humerus.

[0073] S3. Select a suitable bone screw position through the first through hole 11, temporarily fix it with a guide pin, and after confirming that the position is correct, implant the first fastener in sequence to fix the first support part 1 to the lesser tubercle of the humerus 4.

[0074] S4. Select a suitable fixation point through the second through hole 21, use a guide pin for temporary fixation, and then implant the second fastener so that the second support part 2 is close to the anterior medial side of the humerus.

[0075] S5. Check the fixation of the support device to the humerus, and confirm that the direction of the screw in the support device is perpendicular to the direction of the rotator cuff traction force, and the implantation direction of the first fastener and the second fastener is perpendicular to the plane of motion of the humerus rotating around the sagittal axis.

[0076] The following describes specific embodiments of this application based on the above technical solution.

[0077] Example 1

[0078] See Figures 1-5 Example 1 provides a humeral support device, which includes a first support part 1, a second support part 2, and a connecting part 3. The first support part 1 and the second support part 2 are fixedly connected by the connecting part 3. The first support part 1 is provided with a plurality of first through holes 11, and the second support part 2 is provided with a plurality of second through holes 21. A first fastener is fixedly connected to the lesser tubercle 4 of the humerus through the first through holes 11, and a second fastener is fixedly connected to the anteromedial side of the humerus through the second through holes 21. The implantation directions of the first fastener and / or the second fastener intersect the motion plane of the humerus rotating about the sagittal axis relative to the shoulder joint.

[0079] The support device is made of titanium alloy. The implantation direction of the first fastener and / or the second fastener is perpendicular to the plane of motion of the humerus rotating about the sagittal axis relative to the shoulder joint. The first support portion 1 has a first contact surface, and the second support portion 2 has a second contact surface 22; the first contact surface and the second contact surface 22 are oriented towards the humerus, and the first contact surface and the second contact surface 22 have an arcuate structure, and the first contact surface and the second contact surface 22 can fit against the humerus. The connecting portion 3 has a strip-shaped structure, and the width of both the first support portion 1 and the second support portion 2 is greater than the width of the connecting portion 3. The connecting portion 3 has a slender strip-shaped structure.

[0080] The included angle between the first support part 1 and the second support part 2 is 30°-50°. The support device formed by the first support part 1, the connecting part 3, and the second support part 2 is "7" shaped. The first support part 1 and the second support part 2 are arc-shaped structures. The first support part 1, the second support part 2, and the connecting part 3 are integrally formed structures.

[0081] The length of the support device along the proximal to distal humerus is 20mm-80mm; the length of the support device along the medial to lateral side of the humerus is 8-10mm; the thickness of the support device is 1.2-2.5mm. The thickness of at least one of the first support portion 1 or the second support portion 2 is less than the thickness of the connecting portion 3.

[0082] Example 2

[0083] The difference between Embodiment 2 and Embodiment 1 is that multiple first through holes 11 are evenly spaced on the first support portion 1; and multiple second through holes 21 are evenly spaced on the second support portion 2. The length of the first support portion 1 is less than or equal to the length of the second support portion 2. The first support portion 1 is provided with four first through holes 11, and the second support portion 2 is provided with five second through holes 21. The diameter of the first through holes 11 is the same as the diameter of the second through holes 21.

[0084] The above-disclosed embodiments are merely several preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A support device for the humerus, characterized in that, The support device includes a first support part (1), a second support part (2) and a connecting part (3), wherein the first support part (1) and the second support part (2) are fixedly connected by the connecting part (3); The first support part (1) is provided with a plurality of first through holes (11), and the second support part (2) is provided with a plurality of second through holes (21). The first fastener fixes the first support part (1) to the lesser tubercle of the humerus (4) through the first through holes (11), and the second fastener fixes the second support part (2) to the anteromedial side of the humerus through the second through holes (21). The implantation directions of the first fastener and / or the second fastener intersect the plane of motion of the humerus rotating about the sagittal axis relative to the shoulder joint.

2. The support device according to claim 1, characterized in that, The first support part (1) has a first contact surface, and the second support part (2) has a second contact surface (22). The first contact surface and the second contact surface (22) are disposed facing the humerus. The first contact surface and the second contact surface (22) are arc-shaped structures and can fit against the humerus.

3. The support device according to claim 1, characterized in that, The connecting part (3) is a strip structure, and the width of at least one of the first support part (1) and the second support part (2) is greater than the width of the connecting part (3).

4. The support device according to any one of claims 1-3, characterized in that, The included angle between the first support part (1) and the second support part (2) is 30°-50°.

5. The support device according to any one of claims 1-3, characterized in that, The first support part (1) and / or the second support part (2) are arc-shaped structures.

6. The support device according to any one of claims 1-3, characterized in that, The first support part (1), the second support part (2) and the connecting part (3) are integrally formed structures.

7. The support device according to any one of claims 1-3, characterized in that, The length of the first support part (1) is less than or equal to the length of the second support part (2).

8. The support device according to any one of claims 1-3, characterized in that, The diameter of the first through hole (11) is the same as the diameter of the second through hole (21).

9. The support device according to any one of claims 1-3, characterized in that, The support device includes at least one of the following features: Multiple first through holes (11) are evenly spaced on the first support part (1); Multiple second through holes (21) are evenly spaced on the second support part (2).

10. The support device according to any one of claims 1-3, characterized in that, The support device includes at least one of the following features: The length of the support device along the direction from the proximal end to the distal end of the humerus is 20mm-80mm; The length of the support device along the direction from the medial side of the humerus to the lateral side of the humerus is 8.0-10.0 mm; The thickness of the support device is 1.2-2.5 mm.

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