A femoral intramedullary nail guide wire guide

Abstract

This utility model relates to the field of orthopedic medical devices, specifically to a femoral intramedullary nail guide wire guide, comprising: a curved portion, a first rod, a second rod, and a handle. The first and second rods are connected by the curved portion, positioning them at a certain angle. The handle is connected to the free end of the first rod. By positioning the first and second rods at a certain angle, a clearance space is created between the operating handle and the patient's anatomical structures, facilitating instrument insertion into the medullary cavity and fundamentally preventing the risk of the guide wire protruding from the medial side of the fracture site, thus improving surgical safety.

Description

Technical Field

[0001] This utility model relates to the field of orthopedic medical devices, specifically to a femoral intramedullary nail guide needle. Background Technology

[0002] In closed reduction surgery with intramedullary nailing for femoral and tibial shaft fractures, the guide pin is a crucial auxiliary instrument for ensuring precise placement of the long guide pin at the distal fracture site. Current techniques generally employ a straight tubular guide pin, which has significant drawbacks in practical operation: First, when the guide pin is inserted to a greater depth, the handle is easily obstructed by the patient's soft tissues, particularly the anterior superior iliac spine. This phenomenon is especially pronounced in obese patients or those with well-developed muscles, often making it difficult to maintain the correct angle. Second, the straight tubular design makes it difficult to maintain parallelism with the physiological axis of the long bone, resulting in a high probability that the guide pin tip will pierce through the medial cortex of the fracture site during its movement. This accidental piercing not only compromises the stability of the fracture reduction but may also damage adjacent femoral arteries and veins and their branches, causing serious iatrogenic complications. Although current techniques attempt to improve these issues by adjusting the surgical technique, the structural characteristics of the instrument itself limit the incidence of guide pin mis-piercing in clinical practice, with a rate of approximately 12%-18%.

[0003] Therefore, there is an urgent need to develop a new type of guide that can effectively avoid anatomical obstruction and ensure the axial stability of the guide needle. Summary of the Invention

[0004] The purpose of this invention is to provide a femoral intramedullary nail guide, which improves the traditional straight tubular structure into a bent structure with a specific angle, making it easier to insert the operating instrument into the medullary cavity and preventing the risk of the guide needle protruding from the inside of the fracture site.

[0005] The technical solution provided by this utility model is: A femoral intramedullary nail guide wire guide device, comprising: The curved portion is constructed as a rigid arc-shaped tubular structure; The first rod extends linearly from one end of the curved portion, and has a handle at its free end. A first guide needle channel is provided inside the first rod near the curved portion. The first guide needle channel extends from the side wall of the first rod toward the curved portion and communicates with the inner cavity of the curved portion. The second rod extends linearly from the other end of the curved portion, forms a certain angle with the first rod, and has a length greater than that of the first rod. The second rod has a second guide needle channel extending along its length. The second guide needle channel is connected to the inner cavity of the curved portion and together with the first guide needle channel, they form a continuous guide needle channel.

[0006] This utility model discloses a guide needle guide. During surgery, the second rod extends into the body, with the curved portion near the end of the second rod also extending into the body, while the curved portion near the end of the first rod remains outside the body. The first rod is positioned outside the body. By setting the first and second rods at a certain angle, a clearance space is created between the handle on the first rod and the patient's anatomical structure, ensuring that the second rod remains parallel to the physiological axis of the long tubular bone as it extends into the bone. This prevents the guide needle tip from deviating during its movement, effectively preventing the risk of the guide needle protruding from the medial side of the fracture site.

[0007] Preferably, the angle α between the second member and the first member is 120° to 140°.

[0008] Preferably, the tube wall at the free end of the second rod extends forward to form a semi-open baffle, the top surface of which is configured as an inclined structure.

[0009] Preferably, the top surface of the baffle is selected from any one of a continuous inclined plane, a stepped inclined plane, or a stepped arc surface.

[0010] Preferably, the curved portion, the first rod, and the second rod are integrally formed from medical-grade stainless steel or titanium alloy.

[0011] The beneficial effects of this utility model's guide needle guide are: By modifying the straight tubular structure into a bent structure with a certain angle, a clearance space is created between the operating handle and the patient's surface anatomy, making it easier to insert the instrument into the medullary cavity and fundamentally preventing the risk of the guide needle protruding from the inside of the fracture site, thus effectively improving the safety of the surgery. This guide needle guide is particularly suitable for obese or muscular patients. Attached Figure Description

[0012] Figure 1 A three-dimensional structural diagram of the femoral intramedullary nail guide needle guide of this utility model; Figure 2 This is a partially enlarged schematic diagram of different inclined surface structures on the top surface of the baffle. Figure 3 A schematic diagram of the cross-sections of the first member, the second member, and the bent section; In the figure, 1 is the curved part, 2 is the first rod, 21 is the first guide needle channel, 22 is the insertion hole, 3 is the second rod, 31 is the second guide needle channel, 4 is the handle, 5 is the guide needle channel, 6 is the semi-open baffle, and 7 is the top surface. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the guide needle guide of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit this utility model.

[0014] like Figure 1 and Figure 3 As shown, this utility model discloses a femoral intramedullary nail guide needle, which is made of one-piece molded medical stainless steel or titanium alloy and consists of a curved part 1, a first rod 2, and a second rod 3. Specifically: the curved part 1 is a rigid arc-shaped tubular structure with a preset radius of curvature, generally within the range of 15-30 mm. One end of the curved part 1 extends straight to form the first rod 2, and its free end is connected to a cylindrical handle 4. A first guide needle channel 21 is provided inside the first rod 2 near the side of the curved part 1. The first guide needle channel 21 extends from the side wall of the first rod 2 towards the curved part 1 and communicates with the inner cavity of the curved part 1.

[0015] The other end of the curved portion 1 extends in a straight line to form a second rod 3, forming an angle α (120°≤α≤140°, preferably 130°) with the first rod 2. The length of the second rod 3 is generally adapted to the length of the femoral intramedullary nail, and its length is greater than that of the first rod 2. The second rod 3 has a second guide needle channel 31 extending along its length, making the second rod 3 a tubular structure. The second guide needle channel 31 communicates with the inner cavity of the curved portion 1, and together with the first guide needle channel 21, forms a continuous guide needle channel 5. The diameter of the guide needle channel 5 is adapted to a standard guide needle. Because the second rod 3 and the curved portion 1 extend into the body, their diameters are smaller than the femoral medullary cavity. To ensure that the insertion hole 22 of the guide needle channel 5 is always outside the body, the insertion hole 22 of the guide needle channel 5 is located on the first rod 2. The insertion hole 22 can be located at any position on the circumferential sidewall of the first rod 2 near the curved portion.

[0016] In some preferred embodiments, the free end of the second rod 3 extends forward to form a semi-open baffle 6, the top surface 7 of which is configured as an inclined surface. The inclined surface can be a continuous inclined surface, a stepped inclined surface, or a stepped arc surface (e.g., Figure 2 (As shown). The design of baffle 6 is to reduce resistance and facilitate the passage of the guide needle through the fracture ends.

[0017] This guide needle is simple to manufacture, made by bending a one-piece medical stainless steel or titanium alloy tube.

[0018] The surgical application method of this utility model's guide needle guide is as follows: First, during the operation, the second rod 3 is inserted into the medullary cavity through the incision at the apex of the greater trochanter of the proximal femur. The first rod 2 and the second rod 3 are designed at an angle so that the handle 4 is located on the lateral side of the anterior superior iliac spine, completely avoiding soft tissue obstruction, and the second rod 3 can continue to extend into the medullary cavity. Then, the axis of the second rod 3 is confirmed to coincide with the long axis of the femur by using a C-arm X-ray machine. Finally, the guide needle is placed into the guide needle guide device through the guide needle channel 5.

[0019] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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 femoral intramedullary nail guide wire guide device, characterized in that, include: The curved portion is constructed as a rigid arc-shaped tubular structure; The first rod extends linearly from one end of the curved portion, and has a handle at its free end. A first guide needle channel is provided inside the first rod near the curved portion. The first guide needle channel extends from the side wall of the first rod toward the curved portion and communicates with the inner cavity of the curved portion. The second rod extends linearly from the other end of the curved portion, forms a certain angle with the first rod, and has a length greater than that of the first rod. The second rod has a second guide needle channel extending along its length. The second guide needle channel is connected to the inner cavity of the curved portion and together with the first guide needle channel, they form a continuous guide needle channel.

2. The femoral intramedullary nail pin guide of claim 1, wherein, The angle α between the second member and the first member is 120° to 140°.

3. The femoral intramedullary nail pin guide of claim 1, wherein, The free end of the second rod extends forward to form a semi-open baffle, the top surface of which is set as an inclined structure.

4. The intramedullary nailing guide of claim 3, wherein, The top surface of the baffle is selected from any one of a continuous inclined plane, a stepped inclined plane, or a stepped arc surface.

5. The femoral intramedullary nail pin guide of claim 1, wherein: The curved section, the first rod, and the second rod are integrally formed from medical-grade stainless steel or titanium alloy.

Images