A guide plate for ulna olecranon tension band kirschner wire insertion
By designing a tension band Kirschner wire placement guide plate for the olecranon of the ulna, and utilizing imaging examinations and high-precision manufacturing technology, precise positioning of the Kirschner wire was achieved. This solved the problems of inaccurate positioning and insufficient individualized adaptation in existing technologies, and improved surgical efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- THE 1ST AFFILIATED HOSPITAL OF SHIHEZI UNIVERSITY
- Filing Date
- 2025-04-09
- Publication Date
- 2026-06-02
AI Technical Summary
In existing technologies, Kirschner wires are not accurately positioned when treating olecranon fractures of the ulna and complex elbow fractures. The operation relies on the surgeon's experience, and there is a high risk of accidental insertion into the joint surface, resulting in a high incidence of complications and a lack of individualized adaptation, leading to high surgical risks.
A tension band Kirschner wire placement guide for the olecranon of the ulna was designed. Through preoperative imaging and three-dimensional reconstruction, the guide was designed using ulnar anatomical landmarks to provide precise needle insertion point positioning. The guide was then manufactured using high-precision machine tools to ensure accurate Kirschner wire placement.
It improves the accuracy and efficiency of Kirschner wire placement, reduces surgical risks and complications, and shortens surgical time.
Smart Images
Figure CN224307390U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical device technology, and in particular relates to a tension band Kirschner wire placement guide plate for the olecranon process of the ulna. Background Technology
[0002] Ulnar olecranon fractures and complex elbow fractures require tension band wire (TBW) fixation after olecranon osteotomy, which necessitates the use of Kirschner wires to compress the bone fragments. Traditionally, Kirschner wires are typically placed in two ways: Intramedullary placement: The Kirschner wire is inserted into the medullary cavity along the long axis of the ulna, but this method is prone to low fixation strength, loosening and dislodgement, protrusion of the wire tail, skin irritation, infection, and the need for secondary surgery. Transcortical placement: The Kirschner wire penetrates the proximal anterior cortex of the ulna for bicortical fixation to enhance stability (AO recommendation), but this method relies heavily on the surgeon's experience and is prone to errors in insertion angle, such as the Kirschner wire accidentally penetrating the articular surface, leading to surgical failure.
[0003] Therefore, the main defects of the existing technology include: 1) Inaccurate positioning, it is difficult to ensure the parallelism of the Kirschner wire and the consistency of the insertion point by manual operation, which increases the number of intraoperative fluoroscopy and radiation exposure; 2) High incidence of complications, such as the Kirschner wire being accidentally inserted into the joint surface, requiring the patient to have a second surgery to remove the metal implant; 3) Lack of individualized adaptation, the universal guide plate cannot match the patient's anatomical variations, such as the olecranon morphology and the difference in the position of the trochlear notch. Utility Model Content
[0004] The purpose of this invention is to provide a Kirschner wire placement guide plate for the olecranon of the ulna. This guide plate can be obtained preoperatively and provides assistance for precise placement of Kirschner wires in the bicortical region, reducing surgical time, improving surgical efficiency, and reducing risks.
[0005] To achieve the above objectives, the technical solution of this utility model is to design a tension band Kirschner wire placement guide plate for the olecranon of the ulna, including a covering plate and a connecting rod; the covering plate is a plate-shaped structure designed using the anatomical landmarks of the dorsal and lateral U-shaped areas of the olecranon of the ulna; the connecting rod extends from the covering plate to the proximal end of the ulna, and one end of the connecting rod located at the proximal end of the ulna is provided with a guide hole; the axis of the guide hole is collinear with the needle insertion path at the proximal end of the ulna.
[0006] Furthermore, there are two guide holes, located one-third of the way down from the trochlear notch on the left and right, respectively, parallel to the joint surface.
[0007] Furthermore, the connecting rod has a guide block at one end near the ulna, and the guide block has a through hole that is coaxial with the guide hole.
[0008] Manufacturing process of the ulnar olecranon tension band Kirschner wire placement guide plate: 1) Perform imaging examination (computed tomography, CT scan) on the patient's ulna, and reconstruct the ulnar data in three dimensions, accurately including detailed information of bones and tendons, thereby reconstructing the ulnar model; 2) On the reconstructed ulna, using anatomical landmarks such as the olecranon, triceps brachii tendon, and trochlear notch, design a design scheme for a precisely matched needle insertion point guide plate; 3) Export the drawing file of the design scheme and manufacture the solid guide plate using a high-precision machine tool to ensure its structural consistency with the design; 4) After cleaning and sterilizing the guide plate, it can be used in surgery to treat the patient, providing precise needle insertion point positioning, thereby improving the accuracy and safety of the surgery.
[0009] The guide hole is designed according to the Kirschner wire specifications, while taking into account the machining accuracy of the machine tool and the assembly clearance, and appropriate tolerances should be reserved.
[0010] How to use the olecranon tension band Kirschner wire placement guide plate: During the operation, the covering surface of the plate is attached to the U-shaped area on the dorsal side of the olecranon of the ulna. At this time, the guide hole is collinear with the needle entry point at the proximal end of the ulna. Insert the Kirschner wire into the needle entry point of the ulna along the guide hole.
[0011] The advantages and beneficial effects of this utility model are as follows: the olecranon tension band Kirschner wire placement guide plate of this utility model can be obtained before operation, providing precise assistance for the insertion of needles for bicortical fixation of olecranon fractures, reducing operation time, improving operation efficiency, and reducing risks. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of Example 1.
[0013] Figure 2 This is a schematic diagram of the structure of Example 2.
[0014] Figure 3 A diagram showing the state of a guide plate used for placing Kirschner wires on the olecranon tension band of the ulna.
[0015] Figure 4 This is a CT scan image of a case study.
[0016] Figure 5 This is a computer simulation diagram of the coronal plane for the surgical plan.
[0017] Figure 6 This is a schematic diagram of the sagittal plane in a computer simulation of the surgical plan.
[0018] Figure 7 This is a schematic diagram of the horizontal plane in a computer simulation of the surgical plan.
[0019] Figure 8 This is a diagram showing the insertion distance of the first Kirschner wire.
[0020] Figure 9 This is a schematic diagram showing the insertion distance of the second Kirschner wire.
[0021] Figure 10 This is a diagram illustrating the verification of the actual needle insertion point and the standard needle insertion point.
[0022] Among them, the covering plate 1, connecting rod 2, guide hole 3, guide block 4, Kirschner wire 5, and ulna B are included. Detailed Implementation
[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model. Example 1
[0024] like Figure 1 As shown, a tension band Kirschner wire placement guide plate for the olecranon of the ulna includes a covering plate 1 and a connecting rod 2. The covering plate 1 is a plate-shaped structure designed using the anatomical landmarks of the dorsal and lateral U-shaped regions of the olecranon of the ulna, and the covering surface of the covering plate 1 matches the U-shaped region of the olecranon of the ulna.
[0025] One end of the connecting rod 2 is connected to the covering plate 1, and the other end of the connecting rod 2 extends to the upper part of the proximal end of the ulna. The connecting rod 2 above the proximal end of the ulna is provided with a guide hole 3 that is collinear with the needle insertion point at the proximal end of the ulna. Example 2
[0026] like Figure 2 As shown, a tension band Kirschner wire placement guide plate for the olecranon of the ulna includes a covering plate 1 and a connecting rod 2. The covering plate 1 is a plate-shaped structure designed using the anatomical landmarks of the dorsal and lateral U-shaped regions of the olecranon of the ulna, and the covering surface of the covering plate 1 matches the U-shaped region of the olecranon of the ulna.
[0027] One end of the connecting rod 2 is connected to the covering plate 1, and the other end of the connecting rod 2 extends to the upper part of the proximal end of the ulna. A guide block 4 is provided on the connecting rod 2 above the proximal end of the ulna. A guide hole 3 is provided on the guide block 4 that is collinear with the needle insertion point at the proximal end of the ulna.
[0028] like Figure 3 As shown, a method for using a tension band Kirschner wire placement guide plate for the olecranon of the ulna is described. During surgery, the covering surface of the covering plate 1 is applied to the olecranon region of the ulna. At this time, the guide hole 3 is collinear with the needle insertion point at the proximal end of the ulna. The Kirschner wire 5 is inserted into the needle insertion point of the ulna along the guide hole 3.
[0029] Case Studies:
[0030] like Figure 4As shown, the patient underwent CT and MRI examinations before surgery. The examination conditions were as follows: CT required a slice no larger than 1.5 mm with data format DICOM; MRI required a slice no larger than 5 mm with data format DICOM.
[0031] like Figure 5 , Figure 6 , Figure 7 As shown, the surgical plan for the patient was simulated by computer, and schematic diagrams were obtained in the coronal, sagittal and horizontal planes, respectively.
[0032] like Figure 8 , Figure 9 As shown, the lengths of the two Kirschner wires inside the bone are 37.015 mm and 34.479 mm, respectively.
[0033] like Figure 10 As shown, due to slight deformation of the guide plate material during sterilization, the thickness of the periosteum on the bone surface of the overlay plate 1 and the U-shaped area of the olecranon in the ulna may cause slight errors in actual surgery. Therefore, a CT scan of the olecranon is performed postoperatively to verify the needle insertion, and the standard needle insertion point is simulated and confirmed by combining the preoperative data to obtain the offset data between the actual needle insertion point and the standard needle insertion point.
[0034] The data are as follows: On the side closer to the radius: the distance between the center point of the standard needle insertion point and the center point of the actual needle insertion point is 1.757 mm; On the side farther from the radius: the distance between the center point of the standard needle insertion point and the center point of the actual needle insertion point is 1.642 mm.
[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A tension band Kirschner wire placement guide plate for the olecranon process, characterized in that: It includes a covering plate and a connecting rod; the covering plate is a plate-shaped structure designed using the anatomical landmarks of the dorsal and lateral U-shaped areas of the olecranon of the ulna; the connecting rod extends from the covering plate to the proximal end of the ulna, and one end of the connecting rod located at the proximal end of the ulna is provided with a guide hole; the axis of the guide hole is collinear with the needle insertion path at the proximal end of the ulna.
2. The olecranon tension band Kirschner wire placement guide plate according to claim 1, characterized in that: There are two guide holes, located one-third of the way down from the trochlear notch on the left and right, respectively, parallel to the joint surface.
3. The olecranon tension band Kirschner wire placement guide plate according to claim 1, characterized in that: The connecting rod has a guide block at one end near the ulna, and the guide block has a through hole that is coaxial with the guide hole.