Forged femoral stem width and thickness profile tolerance detection tool

Abstract

The utility model provides a forge piece femoral stem width and thickness profile tolerance detection gauge, and belongs to the technical field of medical instrument manufacturing and detection. Comprising a width detection module, a thickness detection module, a connection fixing mechanism and a detection assembly. The width detection module comprises a width detection tool base matched with the back outline of the femoral stem; the thickness detection module comprises a thickness detection tool matched with the side contour of the femoral stem; the connecting and fixing mechanism is used for positioning and fixedly connecting the thickness gauge and the width gauge base during thickness profile tolerance detection; the detection assembly includes a stopper rod for measuring a profile deviation. According to the utility model, a modular design is adopted, the width and thickness profile tolerance of a femoral stem product can be rapidly and accurately detected by combining the width detection tool and the thickness detection tool and cooperating with the stopper for measurement, and the device has the advantages of simple structure, convenient operation and high detection precision, and is especially suitable for the quality detection of the forged femoral stem product.

Description

Technical Field

[0001] This utility model belongs to the field of medical device manufacturing and testing technology, specifically relating to a testing fixture for the width and thickness profile of forged femoral stems. Background Technology

[0002] As an important component in total hip arthroplasty, the femoral stem's contour accuracy directly affects the surgical outcome and patient recovery. After the femoral stem is finished, the width and thickness contours of the product are measured. The width and thickness contours are defined as the allowable deviation range between the actual contours and the ideal design contours in the two dimensions of product width and thickness, and are usually controlled by contour tolerance. The role of contour: (1) Matching: It needs to be highly matched with the anatomical shape of the patient's femoral medullary cavity to ensure initial stability after implantation. (2) Stress distribution: Excessive contour deviation will lead to stress concentration, accelerating bone resorption around the prosthesis or prosthesis fracture. (3) Biomechanical properties: It affects the load transmission path and needs to conform to the biomechanical characteristics of the natural human femur. Clinical significance of width and thickness contours: (1) Osteointegration and long-term stability: Excessive contour deviation will lead to uneven contact between the prosthesis and the medullary cavity, uneven distribution of bone cement or biological coating, and affect bone cell ingrowth (osteointegration). If the distal end of the femoral stem is too thick, it may compress the medullary cavity, leading to intraoperative fracture or postoperative prosthesis subsidence. (2) Avoid stress shielding and bone resorption: The femoral stem is designed with a gradient profile (wider at the proximal end and narrower at the distal end) to balance stress transmission and bone preservation. If the femoral stem profile is too rigid (e.g., too wide at the proximal end), it will shield normal bone stress, leading to osteoporosis and prosthesis loosening. (3) Surgical fit and revision risk: Errors in the width and thickness profile may cause the prosthesis to not be fully embedded in the medullary cavity, requiring repeated adjustments and prolonging the operation time.

[0003] Currently, the width and thickness profile of the femoral stem requires rigorous inspection after finishing. Traditional inspection methods suffer from problems such as complex operation, low efficiency, and insufficient accuracy. Existing technologies lack dedicated tooling for inspecting the profile of forged femoral stems, resulting in a time-consuming and labor-intensive inspection process that struggles to guarantee consistent accuracy. Therefore, an improvement is proposed. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a tool for detecting the width and thickness profile of forged femoral stems. The purpose of this utility model is to provide a tool for detecting the width and thickness profile of forged femoral stems that is simple in structure, easy to operate, and has high detection accuracy.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A fixture for measuring the width and thickness profile of forged femoral stems, including a width measurement module, a thickness measurement module, a connecting and fixing mechanism, and measurement components;

[0007] The width detection module includes a width gauge base that matches the dorsal profile of the femoral stem;

[0008] The thickness detection module includes a thickness gauge that matches the lateral profile of the femoral stem;

[0009] The connecting and fixing mechanism is used to position and fix the thickness gauge and the width gauge base during thickness profile detection.

[0010] The detection component includes a stopcock for measuring profile deviation.

[0011] Further defining the above scheme, the width gauge base is provided with a back reverse contour groove for matching the back contour of the femoral stem, one side of the back reverse contour groove is a positioning reference surface I for positioning the femoral stem; a gap is formed between the a side of the back reverse contour groove and the corresponding surface of the femoral stem for inserting a stopper rod to detect the width contour.

[0012] Further defining the above scheme, the thickness gauge is provided with a side reverse contour groove for matching the side profile of the femoral stem, one side of the side reverse contour groove is a positioning reference surface II for positioning the femoral stem; a gap is formed between the b side of the side reverse contour groove and the corresponding surface of the femoral stem for inserting a stopper rod to detect the thickness profile.

[0013] As a further limitation of the above scheme, both the width gauge base and the thickness gauge are made of aluminum alloy.

[0014] Further defining the above scheme, the connecting and fixing mechanism includes a positioning pin hole I and a screw hole I provided on the width gauge base, and a positioning pin hole II and a screw hole II provided on the thickness gauge; the thickness gauge is positioned and connected to the width gauge base through two positioning pins and corresponding positioning pin holes, and the thickness gauge is fixedly connected to the width gauge base through at least two fastening screws and corresponding screw holes.

[0015] As a further limitation of the above scheme, the stopper rod includes stopper rods of different specifications.

[0016] Advantages of this utility model compared to the prior art:

[0017] 1. This solution adopts a modular design. By combining width gauges and thickness gauges with stopper rod measurement, it can quickly and accurately detect the width and thickness profile of femoral stem products. It has the advantages of simple structure, convenient operation and high detection accuracy, and is particularly suitable for quality inspection of forged femoral stem products.

[0018] 2. The inspection fixture in this solution is made of aluminum alloy, which has the advantages of being lightweight, highly accurate, and having a long service life. It can achieve quick clamping and accurate measurement, greatly improving the inspection efficiency and accuracy, and ensuring the product qualification rate. Attached Figure Description

[0019] Figure 1 : A schematic diagram of the structure of the width gauge base in this utility model;

[0020] Figure 2 This utility model Figure 1 AA section view in the middle;

[0021] Figure 3 : A schematic diagram of the thickness gauge structure in this utility model;

[0022] Figure 4 This utility model Figure 3 BB section view in the middle;

[0023] Figure 5 : A schematic diagram of the width profile detection status in this utility model;

[0024] Figure 6 : Schematic diagram of thickness profile detection status in this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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. Therefore, they should not be construed as limitations on this utility model.

[0027] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] Please see Figure 1-6 The embodiments of this utility model are described in detail below.

[0029] Example 1: A fixture for detecting the width and thickness profile of forged femoral stems, including a width detection module, a thickness detection module, a connecting and fixing mechanism, and detection components;

[0030] The width detection module includes a width gauge base 1 that matches the dorsal contour of the femoral stem 5;

[0031] The thickness detection module includes a thickness gauge 2 that matches the side profile of the femoral stem 5;

[0032] The connecting and fixing mechanism is used to position and fix the thickness gauge 2 and the width gauge base 1 during thickness profile detection.

[0033] The detection assembly includes a stopper rod for measuring profile deviation, and the stopper rod comprises stoppers of different specifications.

[0034] For details, please refer to Figure 1 and 2 As shown, the width gauge base 1 is provided with a back reverse contour groove 1-1 for matching the back contour of the femoral stem 5. One side of the back reverse contour groove 1-1 is a positioning reference surface I1-2 for positioning the femoral stem 5. A gap is formed between the a side of the back reverse contour groove 1-1 and the corresponding surface of the femoral stem 5 for inserting a stopper rod to detect the width contour.

[0035] For details, please refer to Figure 3 and 4 As shown, the thickness gauge 2 is provided with a side reverse contour groove 2-1 for matching the side profile of the femoral stem 5. One side of the side reverse contour groove 2-1 is a positioning reference surface II 2-2 for positioning the femoral stem 5. A gap is formed between the b side of the side reverse contour groove 2-1 and the corresponding surface of the femoral stem 5 for inserting a stopper rod to detect the thickness profile.

[0036] Preferably, both the width gauge base 1 and the thickness gauge 2 are made of aluminum alloy.

[0037] Example 2: The connecting and fixing mechanism includes positioning pin holes I1-3 and screw holes I1-4 provided on the width gauge base 1 and positioning pin holes II2-3 and screw holes II2-4 provided on the thickness gauge 2; the thickness gauge 2 is positioned and connected to the width gauge base 1 through two positioning pins 3 and corresponding positioning pin holes, and the thickness gauge 2 is fixedly connected to the width gauge base 1 through at least two fastening screws 4 and corresponding screw holes.

[0038] During testing: (1) First, place the femoral stem 5 product on the width gauge base 1, refer to Figure 5 As shown, ensure that its back is tightly against the positioning reference surface I1-2, then insert a suitable gauge rod into the gap between surface a and the corresponding surface of the femoral stem 5, and measure the contour deviation in the width direction of the product; (2) Next, install and fix the thickness gauge 2, see reference Figure 6 As shown, a suitable gauge stopper is then inserted into the gap between surface b and the corresponding surface of the femoral stem 5 to measure the profile deviation in the thickness direction.

[0039] This utility model adopts a modular design. By combining width gauges and thickness gauges with stopper rod measurement, it can quickly and accurately detect the width and thickness profile of femoral stem products. It has the advantages of simple structure, convenient operation and high detection accuracy, and is particularly suitable for quality inspection of forged femoral stem products.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A forging femoral stem width and thickness profile detection gauge, characterized by: The application relates to a femoral stem width and thickness detection device. The width detection module comprises a width detection base (1) matched with the back profile of the femoral stem (5). The thickness detection module comprises a thickness detection base (2) matched with the side profile of the femoral stem (5). The connecting and fixing mechanism is used for positioning and fixedly connecting the thickness detection base (2) and the width detection base (1) during thickness profile detection. The detection assembly comprises a plug rod used for measuring profile deviation.

2. The wrought femoral stem width and thickness profile gage of claim 1, wherein: The width detection base (1) is provided with a back reverse profile groove (1-1) matched with the back profile of the femoral stem (5), one side of the back reverse profile groove (1-1) is a positioning reference surface I (1-2) used for placing and positioning the femoral stem (5), and a gap used for inserting the plug rod to detect the width profile is formed between the a side of the back reverse profile groove (1-1) and the corresponding surface of the femoral stem (5).

3. The wrought femoral stem width and thickness profile gage of claim 1, wherein: The thickness detection base (2) is provided with a side reverse profile groove (2-1) matched with the side profile of the femoral stem (5), one side of the side reverse profile groove (2-1) is a positioning reference surface II (2-2) used for placing and positioning the femoral stem (5), and a gap used for inserting the plug rod to detect the thickness profile is formed between the b side of the side reverse profile groove (2-1) and the corresponding surface of the femoral stem (5).

4. The wrought femoral stem width and thickness profile gage of claim 1, wherein: The width detection base (1) and the thickness detection base (2) are made of aluminum alloy materials.

5. The wrought femoral stem width and thickness profile gage of claim 1, wherein: The connecting and fixing mechanism comprises a positioning pin hole I (1-3) and a screw hole I (1-4) arranged on the width detection base (1), and a positioning pin hole II (2-3) and a screw hole II (2-4) arranged on the thickness detection base (2); the thickness detection base (2) is positioned and connected with the width detection base (1) through two positioning pins (3) and corresponding positioning pin holes, and the thickness detection base (2) is fixedly connected with the width detection base (1) through at least two fastening screws (4) and corresponding screw holes.

6. The wrought femoral stem width and thickness profile gage of claim 1, wherein: The plug rod comprises plug rods of different specifications.

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