In-vitro sighting device for femoral trochanter fracture
By designing an external aiming device for femoral trochanter fractures, the position of the guide needle is indicated by a contrast needle in the guide tube under fluoroscopy, which solves the problem of guide needle placement deviation and improves the accuracy and safety of the operation.
Patent Information
- Application Number
- CN202422726732.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-11-08
AI Technical Summary
In the surgery for intertrochanteric fractures of the femur, the current PFNA procedure has problems with the guide pin being placed too high or too low, leading to multiple fluoroscopy sessions and tissue damage.
An external aiming device for femoral trochanter fractures was designed, including a mating frame, an extension structure, a guide tube, and a contrast needle. The contrast needle in the guide tube indicates the position of the guide needle under fluoroscopy, thus avoiding positional errors.
This reduces guide needle placement errors, avoids multiple fluoroscopy sessions and tissue damage, and improves the accuracy and safety of the surgery.
Smart Images
Figure CN223614917U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of surgical instruments for fractures, specifically to an external aiming device for femoral trochanteric fractures. Background Technology
[0002] PFNA is a novel proximal femoral internal fixation system, which is an improved system based on the existing PFN (proximal femoral intramedullary nail). It retains the advantages of the original PFN, has the same biomechanical characteristics, and provides more effective fixation and simpler operation.
[0003] PFNA internal fixation is mainly used to treat intertrochanteric fractures, and is suitable for intertrochanteric fractures caused by osteoporosis in the elderly. The surgery needs to be performed under combined spinal-epidural anesthesia or general anesthesia. During the operation, a lower limb traction table and C-arm fluoroscopy are required. First, the fracture ends are tractioned and reduced under the traction table, and the position is confirmed to be good using C-arm fluoroscopy. Then, the affected limb is disinfected and draped with sterile towels. A lateral longitudinal incision is made with the tip of the greater trochanter as the center. The entry point of the PFNA is the tip of the greater trochanter. When it enters the bone, C-arm fluoroscopy is used, and then the medullary canal is reamed and the PFNA is implanted. After implantation, the position is also determined using C-arm fluoroscopy, and the proximal and distal locking screws are locked. After locking, the fracture position and internal fixation position are still determined using C-arm fluoroscopy, and then the layers are sutured to the skin.
[0004] In summary, the current PFNA surgical procedure has the following technical problems: In the surgery for intertrochanteric fractures of the femur, after inserting the PFNA main nail at the apex of the greater trochanter, an insertion handle needs to be installed, and an aiming arm is connected to one end of the insertion handle. The guide pin is inserted through the aiming arm. After the guide pin is inserted, the lateral skin and soft tissue need to be dissected before other instruments are inserted along the guide pin. The correct insertion of the guide pin should reach the midline of the femoral neck. However, in actual operation, because the connection position between the aiming arm and the insertion handle is estimated by the surgeon based on experience and visual estimation, the insertion position of the guide pin is too high or too low under fluoroscopic observation. This requires removing the guide pin, adjusting the position of the aiming arm, re-inserting the needle, and re-incising and dissecting the soft tissue, causing multiple unnecessary iatrogenic injuries to the patient's tissues and bones. Utility Model Content
[0005] To address the aforementioned problems in the existing technology, this utility model provides an external aiming device for femoral trochanter fractures.
[0006] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:
[0007] An external aiming device for femoral trochanter fracture includes a mating frame, an extension structure, a guide tube, and a contrast needle. The mating frame is U-shaped with right-angled corners. The mating frame is positioned with its opening facing one of the two sides. A mating hole is formed in the middle plate between the two side plates of the mating frame. An extension structure is provided on the upper side of the mating frame, extending away from the mating frame. A guide tube is provided on the extension structure, positioned along the opening direction of the mating frame. A sliding hole is formed at the central axis of the guide tube, and a contrast needle is slidably connected within the sliding hole of the guide tube.
[0008] Furthermore, the mating hole is consistent with the aiming hole of the existing PFNA, avoiding interference with the entry of other instruments.
[0009] Furthermore, the extension structure is a connecting rod, and the connecting rod is 10cm in length.
[0010] Furthermore, the extended structure includes a fixed cylinder, a sliding column, and a locking pin. The fixed cylinder is fixedly connected to the mating frame, and the sliding column is slidably connected inside the fixed cylinder. A guide cylinder is fixedly connected to the sliding column. A locking pin is threadedly connected to the upper side of the fixed frame, and the locking pin abuts against the sliding column. The fixed cylinder is non-circular, and the center structure of the sliding column and the fixed cylinder is consistent to prevent the sliding column from deflecting relative to the fixed cylinder and to ensure that there is no angular deflection between the guide cylinder and the mating frame.
[0011] Furthermore, a side plate is fixedly connected to the right side of the mating frame in the opening direction, and a frame edge is fixedly connected to the left side of the mating frame in the opening direction. The inner edge of the frame edge extends towards the center of the mating frame. A screw is threadedly connected to the side plate. A control button is fixedly connected to the screw on the side away from the mating frame. A tightening plate is fixedly connected to the end of the screw away from the control button. After the mating frame and the sight are fitted together, the control button is rotated through the tightening plate and the side plate. The screw engages with the side plate, and the tightening plate and the side plate tighten the sight, preventing interference with the angle between the guide tube and the sight due to loosening.
[0012] Furthermore, the guide cylinder is provided with an arc rod near the opening of the mating frame. The upper end of the arc rod is rotatably connected to the horizontal radial position of the guide cylinder, and the lower end of the arc rod is provided with a bracket. The axial direction of the bracket is parallel to the axial direction of the guide cylinder, and an infrared component, which is an infrared emitter, is clamped inside the bracket.
[0013] The beneficial effects of this utility model are:
[0014] An external aiming device for femoral trochanteric fractures uses a frame that mates with the aiming device. By extending the height of the extension structure, the imaging needle in the guide tube is positioned higher than the front of the thigh, aligning it with the guide needle to be inserted through the aiming device. The guide needle position is indicated under fluoroscopy, avoiding the harm caused to the patient by incorrect guide needle placement and repeated insertions.
[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.
[0017] Figure 1 This is a schematic diagram of the overall structure of the external aiming device for femoral trochanter fracture according to an embodiment of the present invention;
[0018] Figure 2 This is a schematic diagram showing the structural connection of the mating frame, connecting rod, and guide cylinder according to an embodiment of the present utility model;
[0019] Figure 3 This is a schematic diagram of the overall structure of another structure of the external aiming device for femoral trochanter fracture described in this embodiment of the present invention;
[0020] Figure 4 This is a schematic diagram of the extended structure described in an embodiment of the present utility model;
[0021] Figure 5 This is a structural schematic diagram of the vehicle body fitting frame, side plate, and frame edge as described in an embodiment of this utility model;
[0022] Figure 6 This is a cross-sectional structural diagram of the mating frame, side plate, and frame edge according to an embodiment of the present utility model;
[0023] Figure 7 This is a schematic diagram of the structure of the control button, screw, and clamping plate described in an embodiment of the present invention;
[0024] Figure 8 This is a schematic diagram of the structure of the guide cylinder and the arc rod described in an embodiment of the present utility model;
[0025] Figure 9 This is a schematic diagram of the arc rod described in an embodiment of the present utility model.
[0026] The attached diagram lists the components represented by each number as follows:
[0027] 1-Matching frame, 101-Matching hole, 102-Connecting rod, 110-Fixing cylinder, 111-Sliding column, 112-Locking pin, 120-Side plate, 121-Frame edge, 122-Control button, 123-Screw, 124-Tightening plate, 2-Guide cylinder, 201-Sliding hole, 211-Arc rod, 212-Card holder, 213-Infrared assembly, 3-Developing needle. Detailed Implementation
[0028] 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 skilled in the art without creative effort are within the protection scope of the present utility model.
[0029] Example 1
[0030] like Figure 1-2 As shown
[0031] An external aiming device for femoral trochanter fracture includes a mating frame (1), an extension structure, a guide tube (2), and a contrast needle (3). The mating frame (1) is U-shaped, and the corners of the mating frame (1) are right-angled. The mating frame (1) is placed with its opening facing one of the two sides. The mating frame (1) has a mating hole (101) on the middle plate between the two side plates (120). The mating frame (1) has an extension structure on its upper side, which extends away from the mating frame (1). The extension structure has a guide tube (2) which is set along the opening direction of the mating frame (1). The guide tube (2) has a sliding hole (201) at the central axis position of the guide tube (2), and the contrast needle (3) is slidably connected in the sliding hole (201) of the guide tube (2).
[0032] The mating hole (101) is consistent with the aiming hole of the existing PFNA, so as to avoid interfering with the entry of other instruments;
[0033] The extension structure is a connecting rod (102), and the length of the connecting rod (102) is 10cm;
[0034] Example 2
[0035] like Figure 3-7 As shown
[0036] The extension structure includes a fixed cylinder (110), a sliding column (111), and a locking pin (112). The fixed cylinder (110) is fixedly connected to the mating frame (1). The sliding column (111) is slidably connected inside the fixed cylinder (110). A guide cylinder (2) is fixedly connected to the sliding column (111). A locking pin (112) is threadedly connected to the upper side of the fixed frame. The locking pin (112) abuts against the sliding column (111). The fixed cylinder (110) is non-circular. The sliding column (111) and the fixed cylinder (110) have the same central structure to prevent the sliding column (111) from deflecting relative to the fixed cylinder (110) and to ensure that there is no angular deflection between the guide cylinder (2) and the mating frame (1).
[0037] The mating frame (1) is fixedly connected to a side plate (120) on the right side of the opening direction, and a frame edge (121) is fixedly connected to the left side of the opening direction. The inner edge of the frame edge (121) extends toward the center of the mating frame (1). The side plate (120) is threadedly connected to a screw (123). The screw (123) is fixedly connected to a control button (122) on the side away from the mating frame (1). The screw (123) is fixedly connected to a top plate (124) at the end away from the control button (122). After the mating frame (1) is fitted with the sight, the control button (122) is rotated through the top plate (124) and the side plate (120). The screw (123) engages with the side plate (120), and the top plate (124) and the side plate (120) tighten the sight, so as to avoid interference with the angle between the guide tube (2) and the sight due to loosening.
[0038] Example 3
[0039] like Figure 8-9 As shown
[0040] The guide cylinder (2) is provided with an arc rod (211) near the opening of the mating frame (1). The upper end of the arc rod (211) is rotatably connected to the horizontal radial position of the guide cylinder (2). The lower end of the arc rod (211) is provided with a bracket (212). The axial direction of the bracket (212) is parallel to the axial direction of the guide cylinder (2). An infrared component (213) is clamped in the bracket (212). The infrared component (213) is an infrared emitter.
[0041] In summary, this utility model provides an external aiming device for femoral trochanteric fractures. By using a matching frame and aiming device, and by extending the height of the extension structure, the imaging needle in the guide tube is positioned higher than the front of the thigh, aligning it with the position of the guide needle to be inserted through the aiming device. Under fluoroscopy, the position of the guide needle is indicated, avoiding the harm caused to the patient by incorrect placement and repeated insertion of the guide needle.
[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0043] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. An external aiming device for femoral trochanteric fracture, characterized in that: The device includes a mating frame, an extension structure, a guide tube, and a developing needle. The mating frame is U-shaped with right-angled corners. The mating frame is positioned with its opening facing one of the two sides. A mating hole is formed in the middle plate between the two side plates of the mating frame. An extension structure is provided on the upper side of the mating frame, extending away from the mating frame. A guide tube is provided on the extension structure, and the guide tube is positioned along the opening direction of the mating frame. A sliding hole is formed at the central axis position of the guide tube, and a developing needle is slidably connected in the sliding hole of the guide tube.
2. The external aiming device for femoral trochanter fracture as described in claim 1, characterized in that: The mating hole is consistent with the aiming hole of the existing PFNA.
3. The external aiming device for femoral trochanter fracture as described in claim 1, characterized in that: The extension structure is a connecting rod, and the connecting rod is 10cm long.
4. The external aiming device for femoral trochanter fracture as described in claim 1, characterized in that: The extension structure includes a fixed cylinder, a sliding column, and a locking pin. The fixed cylinder is fixedly connected to the mating frame. The sliding column is slidably connected inside the fixed cylinder. A guide cylinder is fixedly connected to the sliding column. A locking pin is threadedly connected to the upper side of the fixed cylinder. The locking pin abuts against the sliding column. The fixed cylinder is non-circular. The central structure of the sliding column and the fixed cylinder is consistent.
5. The external aiming device for femoral trochanter fracture as described in claim 1, characterized in that: The mating frame has a side plate fixedly connected to the right side in the opening direction, and a frame edge fixedly connected to the left side in the opening direction. The inner edge of the frame edge extends towards the center of the mating frame. The side plate is threadedly connected to a screw. A control button is fixedly connected to the screw on the side away from the mating frame. A tightening plate is fixedly connected to the end of the screw away from the control button.
6. The external aiming device for femoral trochanter fracture as described in claim 1, characterized in that: The guide cylinder is provided with an arc rod near the opening of the mating frame. The upper end of the arc rod is rotatably connected to the horizontal radial position of the guide cylinder. The lower end of the arc rod is provided with a bracket. The axial direction of the bracket is parallel to the axial direction of the guide cylinder. An infrared component, which is an infrared emitter, is clamped inside the bracket.