A damping holding device for reduction of femoral neck fractures

Abstract

This utility model discloses a damping holding device for femoral neck fracture reduction, relating to the field of femoral neck fracture surgery. It includes: a holding needle adapter, one end of which is connected to the femoral head via a holding needle; a first ball-and-socket damping pair, connected to the other end of the holding needle adapter; a fixing rod, one end of which is connected to a passive arm, and the other end of which is connected to a second ball-and-socket damping pair; and a movable damping pair, disposed between the first and second ball-and-socket damping pairs. The damping holding device comprises two ball-and-socket damping pairs and a movable damping pair. The damping pairs are connected to the holding needle adapter. When force is applied to the holding needle adapter, if the damping pairs do not move but can move the fixing rod, fracture reduction can be achieved without generating a cutting force on the femoral head, effectively protecting the articular cartilage and bone of the femoral head.

Description

Technical Field

[0001] This utility model belongs to the field of femoral neck fracture surgery, and more specifically, relates to a damping holding device for femoral neck fracture reduction. Background Technology

[0002] Femoral neck fracture is a common fracture condition that requires surgical procedures such as reduction, observation of the reduction effect, and installation of internal fixation. For fractures with high reduction difficulty, one to two 3.5mm bone pins are usually inserted into the femoral head and the greater trochanter of the femoral shaft at both ends of the fracture. Then, the surgeon manually reduces the fracture using the bone pins. During the operation, X-rays are repeatedly taken to observe the reduction status, and the reduction is repeated until the ideal result is achieved.

[0003] However, the above surgical procedure has the following problems: 1. Repeated X-rays are required during the operation, making the procedure complicated; 2. During the reduction process, the bone pin will be subjected to a large reduction force, and the bone pin will generate a cutting force at the femoral head, thereby damaging the articular cartilage of the femoral head and the bone in the femoral head. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a damping holding device for femoral neck fracture reduction and its usage method. This damping holding device includes two ball-joint damping pairs and a movable damping pair. The damping pairs are connected to a holding pin adapter. When force is applied to the holding pin adapter, if the damping pairs do not move but can move the fixing rod, fracture reduction can be achieved without applying a cutting force to the femoral head, effectively protecting the articular cartilage and bone of the femoral head.

[0005] To achieve the above objectives, this utility model provides a damping holding device for reduction of femoral neck fractures, comprising:

[0006] The needle adapter has one end connected to the femoral head via the needle.

[0007] The first ball joint damping pair is connected to the other end of the holding pin adapter;

[0008] A fixed rod, one end of which is used to connect to the passive arm, and the other end of which is connected to the second ball joint damping pair;

[0009] A movable damping pair is disposed between the first ball joint damping pair and the second ball joint damping pair.

[0010] Optionally, the needle adapter is provided with a tracer mounting interface.

[0011] Optionally, the first ball joint damping pair includes:

[0012] A ball joint support has a receiving cavity at one end;

[0013] A spring is provided at the sealing end of the receiving cavity;

[0014] A hinge rod with a ball-shaped head, the ball-shaped head of which is rotatably disposed at the opening end of the receiving cavity, and a metal ball is disposed between the ball-shaped head and the spring;

[0015] The spring uses its own elastic force to press the metal ball against the spherical head.

[0016] Optionally, the second ball joint damping pair and the first ball joint damping pair have the same structure, the hinge rod in the first ball joint damping pair is connected to the other end of the holding pin adapter, and the hinge rod in the second ball joint damping pair is integrally formed with the other end of the fixing rod.

[0017] Optionally, the moving damping pair includes:

[0018] The slide bar sleeve has a limit guide pin in the inner sleeve.

[0019] A slide rod, one end of which is inserted into the inner sleeve of the slide rod hole sleeve, has an elongated hole along the axial direction, and the elongated hole is slidably fitted to the limiting guide pin;

[0020] Multiple pairs of ball bearings are disposed on the inner wall of the slide rod hole sleeve. Each pair of ball bearings is symmetrically arranged on the outer periphery of the slide rod, and the ball bearings abut against the slide rod with constant pressure.

[0021] Optionally, an observation hole is provided on the outer wall of the slide rod hole sleeve along the length direction. The observation hole is an oblong hole and communicates with the inner sleeve of the slide rod hole sleeve.

[0022] Optionally, the other end of the ball joint support in the first ball joint damping pair is connected to the slide rod hole sleeve, and the other end of the slide rod is connected to the other end of the ball joint support in the second ball joint damping pair.

[0023] Optionally, one end of the gripping needle adapter is provided with a mounting hole, the middle section of the gripping needle has a regular polygonal cross-section, the middle section of the gripping needle is inserted into the mounting hole, and the position of the gripping needle is locked by the gripping needle locking knob.

[0024] Optionally, the gripping pin adapter and the gripping pin locking knob are made of plastic.

[0025] This utility model also provides a method of using a damping holding device for femoral neck fracture reduction. The method of using the aforementioned damping holding device for femoral neck fracture reduction includes:

[0026] Install the gripping needle and tracer onto the gripping needle adapter, and fix the fixing rod to the passive arm.

[0027] The holding needle is inserted into the femoral head, and force is applied to the holding needle through the holding needle adapter;

[0028] When the first ball joint damping pair, the moving damping pair and the second ball joint damping pair do not move, the force applied to the holding needle adapter can be gradually increased until the passive arm is moved.

[0029] When the first ball joint damping pair, the moving damping pair, and the second ball joint damping pair move, the force applied to the holding needle adapter stops.

[0030] This utility model provides a damping holding device for femoral neck fracture reduction and its usage method. Its beneficial effects are as follows: In addition to connecting the ball joint damping pair and the moving damping pair on the holding needle adapter, the damping holding device also has a tracer installation interface on the holding needle adapter. In this way, when the femoral head is reduced by the holding needle adapter, the reduction status of the femoral head can be displayed by the tracer, which is convenient for doctors to observe during surgery and simplifies the surgical operation.

[0031] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0032] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0033] Figure 1 A schematic diagram of a damping holding device for reducing femoral neck fractures according to an embodiment of the present invention is shown.

[0034] Figure 2 An internal cross-sectional view of a damping holding device for femoral neck fracture reduction according to an embodiment of the present invention is shown.

[0035] Figure 3 A schematic diagram of the connection of a damping holding device for femoral neck fracture reduction according to an embodiment of the present invention during the fracture reduction process is shown.

[0036] Figure 4 The diagram shows the force direction at various positions during the fracture reduction process of a damping holding device for femoral neck fracture reduction according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Handling needle adapter; 2. Handling needle; 3. Femoral head; 4. First ball joint damping pair; 401. Ball joint support; 402. Steel ball; 403. Spring; 404. Hinge rod; 405. Ball head; 5. Fixing rod; 6. Second ball joint damping pair; 7. Moving damping pair; 701. Slide rod hole sleeve; 702. Limiting guide pin; 703. Slide rod; 704. Observation hole; 705. Ball bearing; 8. Tracker mounting interface; 9. Tracker; 10. Mounting hole; 11. Handling needle locking knob; 12. Acetacea; 13. Femoral shaft; 14. Fracture line. Detailed Implementation

[0039] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0040] This utility model provides a damping holding device for reduction of femoral neck fractures, comprising:

[0041] The needle adapter has one end connected to the femoral head via the needle.

[0042] The first ball joint damping pair is connected to the other end of the holding needle adapter;

[0043] A fixed rod, one end of which is used to connect to the passive arm, and the other end of which is connected to the second ball joint damping pair;

[0044] A movable damping pair is disposed between the first ball joint damping pair and the second ball joint damping pair.

[0045] Specifically, in this damping holding device, not only is the holding needle mounted on the holding needle adapter, but a first ball joint damping pair, a moving damping pair, and a second ball joint damping pair are also sequentially connected to the holding needle adapter. The distal end of the second ball joint damping pair is connected to the passive arm via a fixed rod. When the holding needle is implanted into the femoral head, applying force to the holding needle adapter moves the holding needle along with the femoral head, thus performing a repositioning operation. When there is no relative movement between the damping pairs, it indicates that the applied force will not produce a cutting force on the femoral head through the holding needle. Therefore, the force can be gradually increased until the passive arm is also moved by the holding needle adapter, indicating that the femoral head is also moved along with it. However, when a force is applied to the holding needle adapter and relative movement occurs between the damping pairs, it indicates that the force will produce a cutting force on the femoral head through the holding needle, which can damage the articular cartilage and bone within the femoral head.

[0046] Optionally, the needle adapter is provided with a tracer mounting interface.

[0047] Specifically, the needle adapter is connected to the tracer via a tracer mounting interface. When the needle adapter moves the needle and femoral head for reduction, the binocular recognition system can track the tracer and present the images of both ends of the femoral neck fracture to the doctor in real time, thus facilitating the observation of the fracture reduction status.

[0048] Optionally, the first ball joint damping pair includes:

[0049] A ball joint support has a receiving cavity at one end;

[0050] A spring is located at the sealed end of the receiving cavity;

[0051] A hinge rod with a ball head, the ball head of the hinge rod being rotatably positioned at the opening end of the receiving cavity, and a metal ball being disposed between the ball head and the spring;

[0052] The spring uses its own elastic force to press the metal ball against the spherical head.

[0053] Specifically, in the first ball-joint damping pair, the spherical head of the hinge rod is rotatably connected to the receiving cavity of the ball-joint support. A spring and a metal ball are also installed within the receiving cavity. The spring transmits its elastic force to the metal ball, which then presses against the spherical head of the hinge rod with a constant pressure, preventing the hinge rod from rotating arbitrarily. When the first ball-joint damping pair is subjected to a force transmitted by the holding pin adapter, if the force is less than the frictional force of the metal ball against the spherical head, the force gradually increases until the holding pin adapter moves the entire first ball-joint damping pair. In this case, the force will not produce a cutting force on the femoral head, while still allowing for movement of the femoral head. However, if the force exceeds the frictional force of the metal ball against the spherical head, the ball-joint support and the hinge rod in the first ball-joint damping pair will rotate relative to each other. This force will also be transmitted to the holding pin, causing damage to the femoral head. In this case, it is necessary to stop applying the force to avoid damage to the femoral head.

[0054] Optionally, the second ball joint damping pair has the same structure as the first ball joint damping pair. The hinge rod in the first ball joint damping pair is connected to the other end of the holding pin adapter, and the hinge rod in the second ball joint damping pair is integrally formed with the other end of the fixing rod.

[0055] Optionally, the other end of the ball joint support in the first ball joint damping pair is connected to the slide rod hole sleeve, and the other end of the slide rod is connected to the other end of the ball joint support in the second ball joint damping pair.

[0056] Specifically, during the repositioning of the femoral head, the holding needle in this damping holding device needs to achieve a ball-and-socket fit within the acetabulum. Therefore, the holding needle connected to the femoral head should have at least three rotational degrees of freedom and one translational degree of freedom to ensure the movement of the femoral head within the acetabulum. To increase the flexibility and range of motion, two identical ball-and-socket damping pairs are incorporated into the damping holding device, with a sliding damping pair connecting them. This creates six rotational degrees of freedom and one translational degree of freedom between the holding needle and the fixed rod, satisfying the repositioning movement requirements of the holding needle.

[0057] Optionally, the moving damping pair includes:

[0058] The slide bar sleeve has a limit guide pin in the inner sleeve.

[0059] The slide rod has one end inserted into the inner sleeve of the slide rod hole sleeve. The slide rod has an elongated hole along the axial direction, and the elongated hole is slidably fitted with the limiting guide pin.

[0060] Multiple pairs of ball bearings are set on the inner wall of the slide rod hole sleeve. Each pair of ball bearings is symmetrically arranged on the outer periphery of the slide rod, and the ball bearings abut against the slide rod with constant pressure.

[0061] Specifically, in the sliding damping pair, the slide rod extends and retracts within the inner sleeve of the slide rod hole sleeve. A limiting guide pin in the inner sleeve engages with an elongated hole on the slide rod, thus limiting the direction of movement. Multiple pairs of ball bearings are installed on the inner wall of the inner sleeve, pressing against the outer circumference of the slide rod and providing resistance to its extension and retraction within the slide rod hole sleeve. When the force applied to the holding needle adapter is less than the frictional force of the ball bearings on the slide rod, the slide rod and the slide rod hole sleeve will not move relative to each other. As the force gradually increases until the entire sliding damping pair moves, the holding needle and the femoral head move synchronously. When the force exceeds the frictional force of the ball bearings on the slide rod, the slide rod and the slide rod hole sleeve move relative to each other. This force can damage the femoral head through the holding needle.

[0062] Optionally, an observation hole is provided on the outer wall of the slide rod hole sleeve along the length direction. The observation hole is an oblong hole and is connected to the inner sleeve of the slide rod hole sleeve.

[0063] Specifically, an observation hole is provided on the slide rod hole sleeve. When the slide rod moves in extension and retraction relative to the slide rod hole sleeve, the distance the slide rod moves can be seen through the observation hole, allowing for a quick determination of whether the force applied to the holding needle adapter will cause damage to the femoral head.

[0064] Optionally, one end of the handle adapter is provided with a mounting hole, the middle section of the handle has a regular polygonal cross-section, the middle section of the handle is inserted into the mounting hole, and the position of the handle is locked by the handle locking knob.

[0065] Specifically, the outer periphery of the middle section of the holding needle is set into a polygon, so that the holding needle can be fixed in the mounting hole, and then the connection can be fixed by the holding needle locking knob.

[0066] Optionally, the needle adapter and the needle locking knob are made of plastic.

[0067] Specifically, the manipulator adapter and the manipulator locking knob work together to fix the manipulator to the manipulator adapter. When the manipulator moves the femoral head to reduce its position, since the manipulator adapter and the manipulator locking knob are made of plastic, they will not affect the imaging effect of the medical images, and the doctor can accurately judge the result of the reduction.

[0068] This utility model also provides a method of using a damping holding device for femoral neck fracture reduction. The method of using the aforementioned damping holding device for femoral neck fracture reduction includes:

[0069] Install the gripping needle and tracer onto the gripping needle adapter, and fix the fixing rod to the passive arm.

[0070] The holding needle is inserted into the femoral head, and force is applied to the holding needle through the holding needle adapter;

[0071] When the first ball joint damping pair, the moving damping pair and the second ball joint damping pair do not move, the force applied to the holding needle adapter can be gradually increased until the passive arm is moved.

[0072] When the first ball joint damping pair, the moving damping pair, and the second ball joint damping pair move, the force applied to the holding needle adapter stops.

[0073] Specifically, when using this damping holding device to reposition the femoral head, first install the holding pin and tracer on the holding pin adapter, then fix the fixed rod to the passive arm, and then apply force to the holding pin adapter to move the holding pin to reposition the femoral head. Gradually increase the force applied to the holding pin adapter, ensuring that the damping pair does not move while moving the holding pin through the holding pin adapter. In this way, the repositioning state of the femoral head can be identified by the tracer. However, when relative movement occurs inside the damping pair while applying force to the holding pin adapter, it is necessary to stop applying force to avoid the force being transmitted to the femoral head through the holding pin, which could damage the articular cartilage and bone of the femoral head.

[0074] Example

[0075] like Figures 1 to 4 As shown, this utility model provides a damping holding device for reduction of femoral neck fractures, comprising:

[0076] The needle adapter 1 is connected to the femoral head 3 at one end via the needle 2;

[0077] The first ball joint damping pair 4 is connected to the other end of the holding needle adapter 1;

[0078] The fixed rod 5 has one end for connection to the passive arm and the other end for connection to the second ball joint damping pair 6.

[0079] The movable damping pair 7 is disposed between the first ball joint damping pair 4 and the second ball joint damping pair 6.

[0080] In this embodiment, the needle adapter 1 is provided with a tracer mounting interface 8.

[0081] In this embodiment, the first ball joint damping pair 4 and the second ball joint damping pair 6 are ball joint damping pairs with identical structures, and the ball joint damping pair includes:

[0082] The ball joint support 401 has a receiving cavity at one end;

[0083] Spring 403 is disposed at the sealing end of the receiving cavity;

[0084] A hinge rod 404 with a ball head, the ball head 405 of the hinge rod 404 is rotatably disposed at the opening end of the receiving cavity 402, and a steel ball 402 is disposed between the ball head 405 and the spring 403.

[0085] Spring 403 uses its own elastic force to press steel ball 402 against spherical head 405.

[0086] In this embodiment, the second ball joint damping pair 6 and the first ball joint damping pair 4 have the same structure. The hinge rod in the first ball joint damping pair 4 is connected to the other end of the holding pin adapter 1, and the hinge rod in the second ball joint damping pair 6 is integrally formed with the other end of the fixing rod 5.

[0087] In this embodiment, the moving damping pair 7 includes:

[0088] Slide rod hole sleeve 701, with limit guide pin 702 welded in the inner sleeve;

[0089] The slide rod 703 has one end inserted into the inner sleeve of the slide rod hole sleeve 701. The slide rod 703 has an elongated hole along the axial direction. The elongated hole is in contact with the limiting guide pin 702 and slides together.

[0090] Multiple pairs of ball bearings 705 are set on the inner wall of the slide rod hole sleeve 701. Each pair of ball bearings 705 is symmetrically arranged on the outer periphery of the slide rod 703. The ball bearings 705 abut against the slide rod 703 with constant pressure.

[0091] In this embodiment, an observation hole 704 is provided on the outer wall of the slide rod hole sleeve 701 along the length direction. The observation hole 704 is an oblong hole and is connected to the inner sleeve of the slide rod hole sleeve 701.

[0092] In this embodiment, the other end of the ball joint support in the first ball joint damping pair 4 is connected to the slide rod hole sleeve 701, and the other end of the slide rod 703 is connected to the other end of the ball joint support in the second ball joint damping pair 6.

[0093] In this embodiment, one end of the holding needle adapter 1 is provided with a mounting hole 10, the middle section of the holding needle 2 has a hexagonal cross-section, the middle section of the holding needle 2 is inserted into the mounting hole 10, and the position of the holding needle 2 is locked by the holding needle locking knob 11.

[0094] In this embodiment, the needle adapter 1 and the needle locking knob 11 are made of plastic.

[0095] This utility model also provides a method of using a damping holding device for femoral neck fracture reduction. The method of using the aforementioned damping holding device for femoral neck fracture reduction includes:

[0096] Install the gripping needle 2 and the tracer 9 on the gripping needle adapter 1, and fix the fixing rod 5 to the passive arm.

[0097] The holding needle 2 is inserted into the femoral head 3, and force is applied to the holding needle 2 through the holding needle adapter 1;

[0098] When the first ball joint damping pair 4, the moving damping pair 7 and the second ball joint damping pair 6 do not move, the force applied to the holding needle adapter 1 can be gradually increased until the passive arm is moved.

[0099] When the first ball joint damping pair 4, the moving damping pair 7, and the second ball joint damping pair 6 move, the force applied to the holding needle adapter 1 stops.

[0100] In summary, when using this damping holding device for femoral neck fracture reduction surgery, firstly, the holding needle 2 is installed on the holding needle adapter 1 and locked in place using the holding needle locking knob 11. Then, the tracer 9 is connected to the tracer mounting interface 8. Next, the fixing rod 5 is connected to the passive arm, so that the first ball joint damping pair 4, the second ball joint damping pair 6, and the moving damping pair 7 all remain relatively stationary. The holding needle 2 is then implanted into the femoral head 3, and the position and orientation of the femoral head are tracked using the tracer 9, applying force to the holding needle adapter 1. Observe whether the three damping pairs move relative to each other. If the damping pairs do not slide or rotate, gradually increase the force until the femoral head is displaced in the binocular recognition system. At this time, the passive arm also moves simultaneously. According to the monitoring data of the tracer, the femoral head 3 is reset. When the force is applied to the holding needle adapter 1, the relative displacement of the three damping pairs indicates that the applied force is acting on the holding needle and will cause damage to the articular cartilage and bone of the femoral head when transmitted to the femoral head. The force needs to be removed.

[0101] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A damping holding device for reduction of femoral neck fracture, characterized by, include: A needle adapter is provided, with one end connected to one end of a needle, the other end of which is inserted into the femoral head. The first ball joint damping pair is connected to the other end of the holding pin adapter; A fixed rod, one end of which is used to connect to the passive arm, and the other end of which is connected to the second ball joint damping pair; A movable damping pair is disposed between the first ball joint damping pair and the second ball joint damping pair.

2. A damping holding device for reduction of femoral neck fracture according to claim 1, wherein The needle adapter is provided with a tracer mounting interface.

3. The damping holder device for reduction of femoral neck fracture according to claim 1, characterized in that, The first ball joint damping pair includes: A ball joint support has a receiving cavity at one end; A spring is provided at the sealing end of the receiving cavity; A hinge rod with a ball-shaped head, the ball-shaped head of which is rotatably disposed at the opening end of the receiving cavity, and a metal ball is disposed between the ball-shaped head and the spring; The spring uses its own elastic force to press the metal ball against the spherical head.

4. A damping holder device for reduction of femoral neck fractures according to claim 3, characterized in that The second ball joint damping pair has the same structure as the first ball joint damping pair. The hinge rod in the first ball joint damping pair is connected to the other end of the holding pin adapter, and the hinge rod in the second ball joint damping pair is integrally formed with the other end of the fixing rod.

5. A damping holder device for reduction of femoral neck fractures according to claim 4, characterized in that The moving damping pair includes: The slide bar sleeve has a limit guide pin in the inner sleeve. A slide rod, one end of which is inserted into the inner sleeve of the slide rod hole sleeve, has an elongated hole along the axial direction, and the elongated hole is slidably fitted to the limiting guide pin; Multiple pairs of ball bearings are disposed on the inner wall of the slide rod hole sleeve. Each pair of ball bearings is symmetrically arranged on the outer periphery of the slide rod, and the ball bearings abut against the slide rod with constant pressure.

6. A damping holder device for reduction of femoral neck fractures according to claim 5, characterized in that An observation hole is provided on the outer wall of the slide rod hole sleeve along the length direction. The observation hole is an oblong hole and is connected to the inner sleeve of the slide rod hole sleeve.

7. The damping holder device for reduction of femoral neck fracture according to claim 5, characterized in that, The other end of the ball joint support in the first ball joint damping pair is connected to the slide rod hole sleeve, and the other end of the slide rod is connected to the other end of the ball joint support in the second ball joint damping pair.

8. The damping holder device for reduction of femoral neck fracture according to claim 1, characterized in that, One end of the gripping needle adapter is provided with a mounting hole. The middle section of the gripping needle has a regular polygonal cross-section. The middle section of the gripping needle is inserted into the mounting hole, and the position of the gripping needle is locked by the gripping needle locking knob.

9. A damping holder device for reduction of femoral neck fractures according to claim 8, characterized in that The gripping needle adapter and the gripping needle locking knob are made of plastic.

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