Polar coordinate positioner

Abstract

The utility model provides a polar coordinate positioner. The polar coordinate positioner comprises a plurality of radiation positioning lines which are fixedly connected and a plurality of circular positioning lines which are distributed at equal intervals, the plurality of radiation positioning lines are distributed at equal angles, one ends of the plurality of radiation positioning lines are converged at a pole, the circular positioning lines are fixedly connected with the plurality of radiation positioning lines, and the circular positioning lines are fixedly connected with the plurality of radiation positioning lines. And the circular positioning line I is arranged by taking the pole as a circle center. The polar coordinate positioner provided by the utility model is soft in material, easy to fold, high in plasticity and better in skin fitting degree; the device has the advantages of being simple in structure, good in developing effect, convenient to clean, capable of being repeatedly used, capable of completing normal position and side position positioning on one plane and capable of reducing the deviation rate.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a polar coordinate positioner. Background Technology

[0002] With the continuous development of surgery, minimally invasive surgery is advancing rapidly. For patients, minimally invasive surgery not only results in less trauma and faster recovery, but also reduces hospitalization time and medical expenses. However, orthopedic minimally invasive surgery often relies on X-ray equipment for precise preoperative positioning, allowing surgeons to operate with ease during the procedure. This positioning requires repeated X-ray examinations by both doctors and patients before surgery, resulting in exposure to a certain dose of ionizing radiation. To resolve the conflict between precise positioning and the patient's absorption of ionizing radiation from repeated X-rays, this foldable preoperative X-ray fluoroscopic positioning device was invented after repeated design and improvement.

[0003] Clinically experienced surgeons are relatively familiar with the anatomy of the surgical area, while some surgeons, due to a lack of experience, undergo repeated X-rays before and even during surgery to determine anatomical locations, increasing the radiation exposure for both patients and doctors. To achieve precise positioning in minimally invasive orthopedic surgery, some clinicians use Kirschner wires for preoperative positioning and marking, or arrange several Kirschner wires in a crisscross pattern to form a simple framework for positioning.

[0004] However, existing simple Kirschner wire locators used for preoperative orthopedic positioning can only be laid flat on the spine in a single plane, making it difficult to simultaneously capture anteroposterior and lateral radiographs. Furthermore, the X-ray images may shift, resulting in inaccurate positioning.

[0005] The simple positioning device has no scale, making it inaccurate for measuring length.

[0006] The simple positioner has no angle, and the angle measurement length is inaccurate, resulting in inaccurate screw direction;

[0007] Patients experienced poor comfort during use;

[0008] Kirschner wires are consumables. To prevent displacement during fluoroscopy, they are usually fixed to the skin with adhesive tape. As a result, the adhesive residue on Kirschner wires is obvious, difficult to clean, and cannot be reused.

[0009] Therefore, it is necessary to provide a new polar coordinate locator to solve the above-mentioned technical problems. Utility Model Content

[0010] The technical problem solved by this utility model is to provide a polar coordinate locator that is soft, easy to fold, highly malleable, and better fits the skin; has better imaging effect, is easy to clean, can be reused, can complete both orthogonal and lateral positioning on a plane, and can reduce the deviation rate.

[0011] To solve the above-mentioned technical problems, the polar coordinate locator provided by this utility model includes: a plurality of fixedly connected radial positioning lines and a plurality of equally spaced circular positioning lines. The plurality of radial positioning lines are distributed at equal angles, and one end of the plurality of radial positioning lines converges at a pole. The circular positioning lines are fixedly connected to the plurality of radial positioning lines, and the pole of the circular positioning lines is set as the center.

[0012] Preferably, the number of the radiation positioning lines is twelve, and the angle between two adjacent radiation positioning lines is thirty degrees.

[0013] Preferably, the two adjacent radial positioning lines have different thicknesses.

[0014] Preferably, the number of circular positioning lines is such that two adjacent circular positioning lines have different thicknesses.

[0015] Preferably, both the radial positioning line and the circular positioning line are made of barium wire.

[0016] Compared with related technologies, the polar coordinate positioner provided by this utility model has the following advantages:

[0017] This invention provides a polar coordinate locator, which is made of soft, foldable, and highly malleable material, and has better skin adhesion; it has better imaging effect; it is easy to clean and can be reused; it can complete both orthogonal and lateral positioning on a single plane, and can reduce the deviation rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a preferred embodiment of the polar coordinate locator provided by this utility model.

[0019] The diagram is labeled: 1. Radial positioning line, 2. Circular positioning line. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please refer to the following: Figure 1 ,in, Figure 1 This is a schematic diagram of a preferred embodiment of the polar coordinate locator provided by this utility model. The polar coordinate locator includes: a plurality of fixedly connected radial positioning lines 1 and a plurality of equally spaced circular positioning lines 2. The plurality of radial positioning lines 1 are distributed at equal angles, and one end of the plurality of radial positioning lines 1 converges at a pole. The circular positioning lines 2 are fixedly connected to the plurality of radial positioning lines 1, and the pole of the circular positioning line 2 is set as the center.

[0022] The number of radiation positioning lines 1 is twelve, and the angle between two adjacent radiation positioning lines 1 is thirty degrees.

[0023] The two adjacent radial positioning lines 1 have different thicknesses.

[0024] The number of circular positioning lines 2 is 12, and the thickness of two adjacent circular positioning lines 2 is different.

[0025] Both the radial positioning line 1 and the circular positioning line 2 are made of barium wire.

[0026] Positioning can be easily achieved using radial positioning lines 1 and circular positioning lines 2 of varying thicknesses.

[0027] The polar coordinate locator provided by this utility model is made of barium wire, which is minimally irritating to the skin. It is soft, easy to fold, highly malleable, and conforms better to the skin. By cleverly utilizing radiopaque lines, it achieves comparable radiopaque results to Kirschner wires, but with better flexibility. The silicone surface is smooth, moisture-resistant, heat-resistant, and corrosion-resistant, facilitating cleaning and disinfection.

[0028] The polar coordinate locator provided by this invention, due to its high flexibility and close fit to the skin, can complete both anterior and lateral positioning on a single plane. Compared with Kirschner wire positioning, polar coordinates provide additional angular information, allowing for accurate marking in a single positioning operation, reducing deviation rate, and making it convenient to use.

[0029] In orthopedics, the center of a joint or a fixed point on a bone can be used as the pole of the polar coordinate locator provided by this invention. For example, in hip joint research, the center of the femoral head can be used as the pole.

[0030] Then, a reference line is selected as the polar axis. For example, when studying the rotation of the femur, the anatomical or mechanical axis of the femur can be used as the polar axis. For other points or structures on the skeleton, polar coordinate locators can be used to represent their positional relationships. Here, represents the distance from the point to the pole (joint center, etc.), and represents the angle of the point relative to the polar axis.

[0031] The application principle of implant positioning in surgical localization is crucial in joint replacement surgery, such as knee replacement. Accurately placing the prosthesis in the appropriate position is key to surgical success. Taking the tibial plateau as an example, the tibial tuberosity is used as a reference point, and the polar axis can be set along the long axis of the tibia.

[0032] For the prosthetic component to be implanted, its ideal position on the tibial plateau can be determined using a polar coordinate locator. For example, the distance of the prosthesis's center position relative to the tibial tuberosity (polar point) and the angle relative to the long axis of the tibia (polar axis) need to be precisely determined. This ensures the correct force line of the prosthesis and reduces postoperative complications such as prosthesis wear and loosening.

[0033] In complex fracture reduction surgeries, such as acetabular fractures, the center of the acetabulum can be used as the pole, and a certain anatomical landmark of the acetabulum can be used as the polar axis.

[0034] The location of fracture fragments can be described using a polar coordinate locator. During reduction, by determining the changes in distance and angle of the fracture fragments relative to the pole (acetabular center), the fragments are accurately repositioned to their normal anatomical location. For example, a fracture fragment of the posterior wall of the acetabulum needs to be restored to the correct distance and angle relationship relative to the acetabular center (pole) during reduction to restore the normal shape and function of the acetabulum.

[0035] For the treatment of acetabular fractures, the center of the acetabulum is used as the pole, and a fixed anatomical landmark on the edge of the acetabulum is used as the polar axis. Polar coordinate locators can well adapt to the circular structure of the acetabulum to describe the position of the fracture fragments. Compared to rectangular coordinates, polar coordinate locators better conform to the physiological structural characteristics of these areas, enabling more precise positioning of the fracture fragments and facilitating reduction procedures for surgeons.

[0036] For example, in spinal surgery, the center of the vertebral body is set as the pole, and the midline of the spine is used as the polar axis. When using a polar coordinate locator to represent the pedicle screw insertion point, the polar diameter represents the distance from the insertion point to the center of the vertebral body, and the polar angle represents the angle relative to the midline. This representation allows surgeons to intuitively understand the positional relationship of the screw insertion point relative to the center of the vertebral body, thus improving the accuracy of screw insertion.

[0037] When assessing the range of motion of a joint, the center of the joint is taken as the pole, and a fixed anatomical direction is taken as the polar axis. For example, in shoulder joint rehabilitation assessment, the center of the humeral head is taken as the pole, and the line connecting the acromion and the humeral head is taken as the polar axis.

[0038] When the arm moves, the distance between a landmark on the arm (such as the lateral epicondyle of the humerus) and its pole (the center of the humeral head) may remain essentially constant (assuming the bone length remains constant), but the angle will change. By measuring the values ​​at different times, the range of motion of the shoulder joint can be accurately assessed, providing quantitative data for rehabilitation treatment.

[0039] In orthopedic surgery and rehabilitation, the direction of force transmission is crucial. The polar angle in a polar coordinate locator system can correspond precisely to the direction of force transmission.

[0040] Taking the knee joint as an example, in knee replacement surgery, the center of the tibial plateau is taken as the pole, and the mechanical axis of the tibia as the polar axis. When assessing the stress on the prosthesis, a polar coordinate locator can determine the components of the force in different directions based on the polar angle. This helps in selecting the appropriate prosthesis type and implantation angle to ensure that the knee joint can withstand normal physiological loads postoperatively, reducing the risk of prosthesis wear and loosening.

[0041] Polar coordinate locators offer a simple and effective measurement method for assessing joint range of motion.

[0042] In shoulder joint range of motion assessment, the center of the humeral head is taken as the pole, and the line connecting the acromion and the humeral head is taken as the polar axis. When the shoulder joint performs flexion, extension, abduction, and adduction movements, the polar angle of a certain landmark on the humerus relative to the pole changes. By measuring the range of change of the polar angle, the range of motion of the shoulder joint can be accurately assessed. This method reflects the physiological characteristics of joint movement more directly than using rectangular coordinates.

[0043] Compared with related technologies, the polar coordinate positioner provided by this utility model has the following advantages:

[0044] This invention provides a polar coordinate locator, which is made of soft, foldable, and highly malleable material, and has better skin adhesion; it has better imaging effect; it is easy to clean and can be reused; it can complete both orthogonal and lateral positioning on a single plane, and can reduce the deviation rate.

[0045] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A polar coordinate locator, characterized in that, include: Multiple fixedly connected radial positioning lines and multiple equally spaced circular positioning lines are provided. The multiple radial positioning lines are distributed at equal angles, and one end of each of the multiple radial positioning lines converges at a pole. The circular positioning lines are fixedly connected to the multiple radial positioning lines, and the pole of the circular positioning lines is set as the center of the circle.

2. The polar coordinate locator according to claim 1, characterized in that, The number of radiation positioning lines is twelve, and the angle between two adjacent radiation positioning lines is thirty degrees.

3. The polar coordinate locator according to claim 1, characterized in that, The two adjacent radial positioning lines are of different thicknesses.

4. The polar coordinate locator according to claim 1, characterized in that, The number of circular positioning lines is such that two adjacent circular positioning lines have different thicknesses.

5. The polar coordinate locator according to claim 1, characterized in that, Both the radial positioning line and the circular positioning line are made of barium wire.

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