Femoral greater trochanter vertex positioning guider
By designing an arc-shaped femoral greater trochanter apex positioning guide, and using multiple through-holes to accurately position Kirschner wires on the body surface, the problems of prolonged X-ray exposure and skin incision infection caused by fluoroscopic confirmation of position in existing technologies are solved, thus achieving safe and efficient femoral trochanter apex surgery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-04-07
AI Technical Summary
Current techniques for femoral trochanter tip surgery require fluoroscopy to confirm the location of the Kirschner wires, resulting in prolonged X-ray exposure, increased radiation and bleeding, and increased risk of bacterial infection due to the external incision.
A curved femoral greater trochanter apex positioning guide was designed. By positioning it outside the body surface, multiple through-holes ensure accurate positioning of the Kirschner wire, avoiding external incisions. The material is made of plastic to reduce weight and facilitate surgical operation.
This method enables precise positioning of Kirschner wires outside the body surface, shortening surgical time, reducing radiation and bleeding, lowering the risk of bacterial infection, and improving the safety and efficiency of the surgery.
Smart Images
Figure CN224085430U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical devices, specifically a positioning guide for the apex of the greater trochanter of the femur. Background Technology
[0002] The greater trochanter of the femur is a square-shaped protrusion located on the lateral aspect of the hip joint, at the junction of the femoral neck and shaft. It is a bony prominence that can be felt by hand. During surgery for intertrochanteric fractures of the femur, Kirschner wires are typically used for fixation. The fixation method involves blindly inserting a Kirschner wire at the greater trochanter apex. The wire is then observed under fluoroscopy in both anteroposterior and lateral views. Because the Kirschner wire is quite thin, repeated fluoroscopy is required to ensure the tip is positioned near the greater trochanter apex. The intramedullary nail is then inserted along the Kirschner wire. However, this fluoroscopy process can sometimes take up to half an hour to ensure accurate placement of the Kirschner wire. During this time, the X-ray exposure is high, increasing radiation exposure for both the patient and the surgeon. Furthermore, the prolonged surgical time increases the risk of blood loss for the patient.
[0003] Patent CN218960957U discloses a positioning device for locating the apex of the greater trochanter during surgery. The device includes a wearable positioning plate and an index finger connected to it. An inclined positioning plate is fixedly installed at the bottom of the wearable positioning plate to facilitate contact with the outer knuckle of the index finger, and a columnar positioning plate is fixedly connected at the top to facilitate direct contact with the inner end of the index finger. During use, the index finger is inserted into the trochanter of the femur inside the patient's body, and the tip of the index finger touches the apex of the greater trochanter. Then, a Kirschner wire is driven into the apex of the greater trochanter through a positioning slot opened inside the wearable positioning plate using an electric or hand-cranked drill. This solves the problems of increased surgical time, increased radiation, and increased bleeding caused by blindly inserting Kirschner wires.
[0004] However, when using the device described in the aforementioned patent, an incision must first be made on the patient's skin to allow the index finger to be inserted into the femoral tuberosity inside the patient's body. This operation can damage the patient's skin barrier and increase the risk of bacterial infection. Utility Model Content
[0005] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a femoral greater trochanter apex positioning guide, so as to ensure accurate insertion of Kirschner wires without the need for surface incisions.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] A positioning guide for the greater trochanter of the femur includes a positioning body with an arc-shaped structure. One end of the positioning body is a first positioning end, and the other end is a second positioning end. The horizontal distance between the first positioning end and the second positioning end is greater than or equal to the horizontal distance between the greater trochanter apex and the highest point on the outer side of the greater trochanter. The vertical distance between the first positioning end and the second positioning end is greater than or equal to the vertical distance between the greater trochanter apex and the highest point on the outer side of the greater trochanter. The first positioning end is provided with a plurality of first needle holes, the central axis of which is perpendicular to the first positioning end. The second positioning end is provided with a plurality of second needle holes, the central axis of which is perpendicular to the second positioning end.
[0008] A handle is fixed on the outer arc of the positioning body that defines this utility model.
[0009] As a further limitation of this utility model: the positioning body and the handle are both made of plastic.
[0010] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:
[0011] This invention includes a positioning body with an arc-shaped structure. One end of the positioning body is a first positioning end, which has multiple first needle-passing holes. The other end of the positioning body is a second positioning end, which has multiple second needle-passing holes. In use, the invention is placed on the skin near the greater trochanter of the femur, with the inner arc of the positioning body close to the femur. After placement, the first positioning end contacts the highest point on the outer side of the greater trochanter, and the second positioning end contacts the apex of the greater trochanter. A Kirschner wire is inserted through the first needle-passing hole, and its position is observed under fluoroscopy. If the position is not suitable, the Kirschner wire is inserted through another first needle-passing hole. If the position is suitable, a second Kirschner wire is inserted through a second needle-passing hole. The position is also observed under fluoroscopy after insertion. If the position is not suitable, it is inserted through another second needle-passing hole. If the position is suitable, the positioning is accurate, and the invention can be removed. This invention ensures accurate Kirschner wire insertion even outside the body surface, solving the problems of skin barrier damage and increased bacterial infection risk caused by incisions on the patient's skin surface in existing technologies.
[0012] In summary, this invention can accurately locate the apex of the greater trochanter, thus ensuring the accurate insertion of the Kirschner wire, without damaging the body surface, and can also shorten the operation time, reduce radiation and bleeding. This invention is applicable to clinical medicine for locating the apex of the greater trochanter of the femur. Attached Figure Description
[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0015] Figure 2 for Figure 1 An enlarged schematic diagram of section C;
[0016] Figure 3 for Figure 1 An enlarged schematic diagram of section D in the middle;
[0017] Figure 4 This is a schematic diagram of the application structure of an embodiment of the present utility model.
[0018] In the figure: 1-positioning body, 11-inner arc, 12-outer arc, 2-first positioning end, 3-second positioning end, 4-first needle hole, 5-second needle hole, 6-handle, 7-Kirschner wire one, 8-Kirschner wire two, 9-femur. Detailed Implementation
[0019] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. It should be understood that the femoral greater trochanter apex positioning guide described herein is a preferred embodiment and is only used for illustration and explanation of this utility model, and does not constitute a limitation thereof.
[0020] The directional terms or positional relationships such as "up," "down," "left," and "right" used in the embodiments are based on the drawings in this utility model specification. Figure 4 The orientation relationships are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model.
[0021] The structure of femur 9 is a well-known technique, such as Figure 4 As shown, point A is the apex of the greater trochanter, and point B is the highest point on the outer side of the greater trochanter. In this embodiment, the action is applied to points A and B.
[0022] like Figure 1 As shown, this embodiment includes a positioning body 1, which has an arc-shaped structure. The positioning body 1 includes an inner arc 11 and an outer arc 12. In use, the inner arc 11 is positioned close to the femur 9. One end of the positioning body 1 is the first positioning end 2, and the other end is the second positioning end 3, as shown. Figure 4 As shown, the horizontal distance L1 between the first positioning end 2 and the second positioning end 3 is greater than or equal to the horizontal distance between the apex A of the trochanter and the highest point B on the outer side of the trochanter, and the vertical distance L2 between the first positioning end 2 and the second positioning end 3 is greater than or equal to the vertical distance between the apex A of the trochanter and the highest point B on the outer side of the trochanter, in order to prevent the horizontal and vertical distances between the first positioning end 2 and the second positioning end 3 from being too close, which would cause the first positioning end 2 to fail to reach the highest point B on the outer side of the trochanter and the second positioning end 3 to fail to reach the apex A of the trochanter.
[0023] like Figure 1 , 2 As shown in Figure 3, the first positioning end 2 is provided with multiple first needle holes 4, and the second positioning end 3 is provided with multiple second needle holes 5. In this embodiment, the number of first needle holes 4 and second needle holes 5 is three each, which is only for illustration. The number can be adjusted according to actual application. The central axis of the first needle hole 4 is set perpendicular to the first positioning end 2, and the central axis of the second needle hole 5 is set perpendicular to the second positioning end 3. In other words, the central axis of the first needle hole 4 is along the left and right direction so that the Kirschner wire 7 can be driven horizontally into the highest point B on the outer side of the greater trochanter; the central axis of the second needle hole 5 is along the up and down direction so that the Kirschner wire 8 can be driven vertically into the apex A of the greater trochanter.
[0024] like Figure 1 As shown, a handle 6 is fixed on the outer arc 12 of the positioning body 1. The handle 6 has a T-shaped structure, which makes it easy to hold and operate this embodiment.
[0025] The positioning body 1 and the handle 6 are both made of plastic, which is lightweight, making the overall weight of this embodiment relatively light.
[0026] When using this embodiment, as Figure 4 As shown, the device is placed on the skin near the greater trochanter of the femur, with the inner arc 11 of the positioning body 1 placed close to the femur 9. The first positioning end 2 contacts the highest point B on the outer side of the greater trochanter, and the second positioning end 3 contacts the apex A of the greater trochanter. A Kirschner wire 7 is inserted through one of the first needle holes 4, and its position is observed under fluoroscopy. If the position is not suitable, the Kirschner wire 7 is inserted through the other first needle hole 4. If the position is suitable, the next step is to insert a Kirschner wire 8 through one of the second needle holes 5. After the Kirschner wire 8 is inserted, its position is also observed under fluoroscopy. If the position is not suitable, it is inserted through the other second needle hole 5. If the position is suitable, it means that the position is accurate, and the device can be removed.
[0027] In this embodiment, the first positioning end 2 and the second positioning end 3 serve a positioning function, which improves the success rate of insertion and reduces fluoroscopy time and bleeding compared to traditional blind Kirschner wire insertion. Furthermore, this embodiment allows for accurate positioning of point A at the apex of the greater trochanter outside the body surface, ensuring accurate Kirschner wire insertion. The intramedullary nail is then inserted along the Kirschner wire. This embodiment does not damage the body surface and can also shorten surgical time, reduce radiation, and decrease bleeding.
[0028] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A positioning guide for the apex of the greater trochanter of the femur, characterized in that, The system includes a positioning body, which has an arc-shaped structure. One end of the positioning body is a first positioning end, and the other end is a second positioning end. The horizontal distance between the first positioning end and the second positioning end is greater than or equal to the horizontal distance between the apex of the trochanter and the highest point on the outer side of the trochanter. The vertical distance between the first positioning end and the second positioning end is greater than or equal to the vertical distance between the apex of the trochanter and the highest point on the outer side of the trochanter. The first positioning end is provided with a plurality of first pin holes, the central axis of which is perpendicular to the first positioning end. The second positioning end is provided with a plurality of second pin holes, the central axis of which is perpendicular to the second positioning end.
2. The femoral greater trochanter apex positioning guide according to claim 1, characterized in that, A handle is fixed on the outer arc of the positioning body.
3. The femoral greater trochanter apex positioning guide according to claim 2, characterized in that, Both the positioning body and the handle are made of plastic.