CN108309418B - A magnetic traction device - Google Patents

Abstract

The invention belongs to the technical field of medical equipment, and mainly relates to a magnetic traction device, which includes an intramedullary rod arranged in the bone cavity and an intramedullary nail for fixing the bone and the intramedullary rod. Both ends of the magnetic traction device are provided with The first snap ring and the second snap ring, one end of the first snap ring and the second snap ring are hinged, and the other end is provided with a fixed ear plate, and a connecting hole is opened on the fixed ear plate, and the first snap ring The outer wall of the ring and the second snap ring is radially provided with a threaded through hole, and an adjusting screw is arranged in the threaded through hole, and the adjusting screw has a positioning card on the ball hinge in the ring where the first snap ring is located. The magnetic force A cylindrical guide rod and a threaded guide rod with equal outer diameters are connected between the first snap rings at both ends of the traction device. Between the second snap rings, it reduces the burden on the patient and avoids the problem of infection in the puncture hole. The traction is more convenient. And not easy to cause discomfort.

Description

A magnetic traction device

technical field

The invention belongs to the technical field of medical equipment, and in particular relates to a magnetic traction device.

Background technique

The intramedullary nail is an internal fixation device in the bone marrow cavity of the human body, and is a commonly used medical device for the treatment of fractures. The intramedullary nail is located in the bone marrow cavity and connects the fractured long tubular bone through the intramedullary nail body and the locking nail. It has the functions of aligning the fracture fragments, fixing them, and supporting a certain gravity, so as to facilitate the growth of callus and fracture healing. . Intramedullary nails are difficult to fix well in large bone defects, and do not have the ability of bone traction. It is often necessary to use bone transfer to fix each segment of bone from the outside. Osteotomy is done through trauma, slow pulling every day, and new long bone is used to repair the original bone defect. However, there are many needle holes and infection is easy to occur. At the same time, the bone is moved and fixed on the patient's body surface, which has a great impact on the daily life of the patient, and it is easy to increase the physical and mental burden of the patient. Not conducive to rehabilitation medicine. The traditional tractable intramedullary nail is fixed by thread connection, and the bone needs to be forcibly pulled during adjustment, which makes the patient prone to discomfort and the adjustment is inconvenient.

Contents of the invention

Based on the problems mentioned in the above background technology, the present invention provides a magnetic traction device, which reduces the burden on patients and avoids the problem of infection of puncture holes. The traction is more convenient and less likely to cause discomfort.

The technical scheme that the present invention adopts is as follows:

A magnetic traction device, comprising an intramedullary rod arranged in a bone cavity, and an intramedullary nail for fixing the bone and the intramedullary rod, both ends of the magnetic traction device are provided with a first clasp and a second clasp, One end of the first snap ring and the second snap ring is hinged, and the other end is provided with a fixed lug plate, and a connection hole is opened on the fixed lug plate, and the average diameter of the outer wall of the first snap ring and the second snap ring is A threaded through hole is provided in the direction, and an adjusting screw is arranged in the threaded through hole. The adjusting screw is provided with a positioning card in the ball hinge of the ring where the first snap ring is located. Between the first snap rings at both ends of the magnetic traction device A cylindrical guide rod and a threaded guide rod with equal outer diameters are connected, a first electromagnet is slidably sleeved on the cylindrical guide rod and the threaded guide rod between the first snap ring, and the second snap rings at both ends of the magnetic traction device Two cylindrical guide rods are connected between the rings, and a second electromagnet is slidingly sleeved on the two cylindrical guide rods between the second snap ring, and the first electromagnet and the second electromagnet are connected with pulse power supply.

It is further defined that both the first electromagnet and the second electromagnet are semi-circular structures, the two ends of the first electromagnet are provided with rectangular protrusions, and the two ends of the second electromagnet are provided with rectangular grooves , the width dimension of the rectangular protrusion is equal to the width dimension of the rectangular groove, and the length dimension of the rectangular protrusion is smaller than the length dimension of the rectangular groove.

It is further defined that an adjustment mechanism is screwed on the threaded guide rod, and the adjustment mechanism includes an adjustment ring, a connecting column and a connection ring, and the adjustment ring is axially provided with a threaded hole that matches the threaded guide rod. The ring and the connecting ring are fixedly connected by a connecting column, the cross section of the connecting ring is circular, and the right end of the first electromagnet is provided with a connecting groove matching the connecting ring at the corresponding position of the adjustment mechanism, and the groove wall of the connecting groove section is located The arc is a minor arc.

Further defined, the surface of the cylindrical guide rod is provided with a length scale.

It is further defined that the hinged end of the first clasp is provided with a hinged block, the hinged end of the second clasp is provided with two hinged lugs, and the hinged block is set between the hinged lugs and hinged by a hinge column, The inner wall of the connection hole of the fixed ear plate on the second snap ring is axially provided with a connecting pin, and the end of the connecting pin passing through the fixed ear plate on the first snap ring is provided with a ball plunger. The opening of one end of the connecting hole close to the second clasp has a rounded structure.

A kind of traction method of magnetic force traction device among the present invention, comprises the following steps:

a. Intramedullary fixation: Insert the intramedullary rod into the bone cavity so that the two ends of the intramedullary rod are respectively located in the broken bones at both ends, and then the broken bones at both ends of the intramedullary rod are respectively connected to the two ends of the intramedullary rod through intramedullary nails. Fix, and then perform minimally invasive osteotomy on one end of the intramedullary rod to form a distraction bone, and fix the traction magnet in the distraction bone;

b. Timing traction: by connecting a power timer between the first electromagnet, the second electromagnet and the power supply, the first electromagnet and the second electromagnet are controlled to work within a specified time period;

c. Oscillating traction: connect the pulse power supply in series between the first electromagnet, the second electromagnet and the timing switch, and form a pulse current through the pulse power supply, so that the strength of the magnetic field strength of the first electromagnet and the second electromagnet is alternating Changes, and then form a changing gravitational force on the traction magnet fixed inside the bone, realize the vibration traction on the bone, and make the osteotomy area grow new bone.

It is further defined that the power supply parameters of the pulse power supply in step c are: within one T, the amplitude at the initial moment is 20V, the amplitude at the T moment is 24V, and it is 20V at the T moment, and the amplitude at the T moment is 20V. It is 16V, and it is 20V at 1T moment.

The beneficial effect that the present invention possesses:

1. By forming a magnetic field with an external electromagnet, the traction magnetic block fixed in the osteotomy is pulled to guide the growth of new bone in the osteotomy area. It is easy to disassemble and install, and it is convenient for patients to use;

2. The magnetic traction device is set outside the body and does not need to puncture the body tissue, which reduces the burden on the patient and avoids the problem of infection in the puncture hole;

3. The use period can be freely selected through the power timer to achieve better traction effect;

4. The electromagnet is connected to the pulse power supply, and the pulse current formed by the pulse power supply makes the magnetic field strength of the electromagnet in a changing state, and then makes the traction force of the electromagnet on the traction magnetic block in a state of change, and enhances the stimulating effect of the traction force on the osteotomy area to improve traction effect;

5. Adjust the position of the positioning card by changing the penetration depth of the adjusting screw, eliminating the influence of individual differences on the use requirements, and then matching the use of different groups of people;

6. There is a length mark on the cylindrical guide rod, and an adjustment mechanism connected to the electromagnet is screwed on the thread guide rod. The position of the electromagnet can be changed by rotating the adjustment mechanism, and the position of the electromagnet can be adjusted according to the growth of new bone. Adjust to further improve the traction effect.

Description of drawings

The present invention can be further illustrated by the non-limiting examples given by the accompanying drawings:

Fig. 1 is the structural representation of a kind of magnetic traction device embodiment of the present invention;

Fig. 2 is the schematic diagram of the enlarged structure of place A in Fig. 1;

Fig. 3 is a schematic structural view of a deployed state of a magnetic traction device embodiment of the present invention;

Fig. 4 is a structural schematic diagram of some elements of the electromagnet in a magnetic traction device embodiment of the present invention;

Fig. 5 is a partial structural schematic diagram of some elements of the electromagnet in an embodiment of a magnetic traction device of the present invention

Fig. 6 is a schematic diagram of an enlarged structure at C in Fig. 5;

The main component symbols are explained as follows:

The first snap ring 11, the second snap ring 12, the connecting pin 121, the ball plunger 122, the adjusting screw 13, the positioning card 14, the fixed ear plate 15, the connecting hole 16, the hinge block 17, the hinge ear plate 18, the second An electromagnet 21, a second electromagnet 22, a via hole 23, a connecting groove 24, a cylindrical guide rod 3, a threaded guide rod 4, an adjustment mechanism 5, an adjustment ring 51, a connecting ring 52, a connecting column 53, and a threaded hole 54.

Detailed ways

In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Example

As shown in Figures 1 to 6, a magnetic traction device includes an intramedullary rod arranged in the bone cavity, and an intramedullary nail for fixing the bone and the intramedullary rod. Both ends of the magnetic traction device are provided with a first clasp 11 and the second snap ring 12, one end of the first snap ring 11 and the second snap ring 12 are hinged, and the other end is provided with a fixed ear plate 15, and a connection hole 16 is provided on the fixed ear plate 15, and the first snap ring 11 and The outer wall of the second snap ring 12 is radially provided with a threaded through hole, and the threaded through hole is provided with an adjusting screw 13, and the adjusting screw 13 has a positioning card 14 at the ball hinge in the ring where the first snap ring 11 is located, and the magnetic traction device is two A cylindrical guide rod 3 and a threaded guide rod 4 with the same outer diameter are connected between the first snap rings 11 at the end, and a first electromagnet is provided slidingly on the cylindrical guide rod 3 and the threaded guide rod 4 between the first snap rings 11. 21. Two cylindrical guide rods 3 are connected between the second snap rings 12 at both ends of the magnetic traction device, and a second electromagnet 22 is provided on the two cylindrical guide rods 3 between the second snap rings 12. The electromagnet 22 is provided with a via hole 23 that matches the cylindrical guide rod 3, and the first electromagnet 21 and the second electromagnet 22 are both connected with a pulse power supply. Such a structural design allows the traction device to be fixed outside the patient's body when traction is required. The first electromagnet 21 and the second electromagnet 22 are supplied with pulse current through the pulse power supply, and the changing magnetic field is generated through the pulse current, and the pulling of the broken bone is completed through the pulling of the pulling magnetic block. Traction stimulates the osteotomy, thereby promoting new bone growth in the osteotomy area.

The steps used in this example are as follows:

1. Intramedullary fixation: Insert the intramedullary rod into the bone cavity so that the two ends of the intramedullary rod are respectively located in the broken bones at both ends, and then the broken bones at both ends of the intramedullary rod are respectively connected to the two ends of the intramedullary rod through intramedullary nails. Fix, and then perform minimally invasive osteotomy on one end of the intramedullary rod to form a distraction bone, and fix the traction magnet in the distraction bone;

2. Timing traction: by connecting a power timer between the first electromagnet 21 and the second electromagnet 22 and the power supply, the first electromagnet 21 and the second electromagnet 22 are controlled to work within a specified time period;

3. Oscillating traction: connect the pulse power supply in series between the first electromagnet 21, the second electromagnet 22 and the timing switch, and form a pulse current through the pulse power supply to make the magnetic field strength of the first electromagnet 21 and the second electromagnet 22 stronger. Weakness changes alternately, and then forms a changing gravitational force on the traction magnetic block fixed inside the bone, realizing vibration traction on the bone, and making new bone grow in the osteotomy area.

Preferably, the power supply parameters of the pulse power supply in step c are: within one T, the amplitude at the initial moment is 20V, the amplitude at the time T is 24V, the amplitude at the time T is 20V, and the amplitude at the time T is 16V, 20 at 1T time.

Preferably, the first electromagnet 21 and the second electromagnet 22 are semi-circular ring structures, the two ends of the first electromagnet 21 are provided with rectangular protrusions, the two ends of the second electromagnet 22 are provided with rectangular grooves, and the rectangular protrusions The width dimension of the protrusion is equal to the width dimension of the rectangular groove, and the length dimension of the rectangular protrusion is smaller than the length dimension of the rectangular groove. Such a structural design facilitates the mutual cooperation of the first electromagnet 21 and the second electromagnet 22 during use. Easy to install.

Preferably, the threaded guide rod 4 is screwed with an adjustment mechanism 5, the adjustment mechanism 5 includes an adjustment ring 51, a connecting column 53 and a connection ring 52, and the adjustment ring 51 is provided with a threaded hole 54 matched with the threaded guide rod 4 in the axial direction. The ring 51 and the connecting ring 52 are fixedly connected through the connecting column 53. The cross section of the connecting ring 52 is circular. The right end of the first electromagnet 21 is provided with a connecting groove 24 matching the connecting ring 52 at the corresponding position of the adjusting mechanism 5. The cross section of the connecting groove 24 is The circular arc where the groove wall is located is an inferior arc. With such a structural design, the first electromagnet 21 and the second electromagnet 22 can be driven to move by rotating the adjusting ring 51 to make the adjusting ring 51 slide along the threaded guide rod 4, which simplifies operation and is convenient to use.

Preferably, a length scale is provided on the surface of the cylindrical guide rod 3. With such a structural design, when adjusting the first electromagnet 21 and the second electromagnet 22, the length scale is used as a reference to make the adjustment accuracy better.

Preferably, the hinged end of the first snap ring 11 is provided with a hinged block 17, and the hinged end of the second snap ring 12 is provided with two hinged lugs 18, and the hinged block 17 is clamped between the hinged lugs 18 and passes through the hinged column 19. Hinged, the inner wall of the connection hole 16 of the fixed ear plate 15 on the second snap ring 12 is provided with a connecting pin 121 in the axial direction, and the connecting pin 121 passes through the first snap ring 11. One end of the fixed ear plate 15 is provided with a ball plunger 122. The connection hole 16 of the first snap ring 11 is a rounded structure near the opening of the second snap ring 12. With such a structural design, the first snap ring 11 and the second snap ring 12 can be directly buckled during installation. Press the ball plunger 122 to pull the first snap ring 11 and the second snap ring 12 to both ends to complete the separation, which is convenient to use and has good practicability.

A magnetic traction device provided by the present invention has been introduced in detail above. The description of specific embodiments is only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (7)

1. A magnetic traction device, comprising an intramedullary rod arranged in the bone cavity and an intramedullary nail that fixes the bone and the intramedullary rod, it is characterized in that: both ends of the magnetic traction device are provided with a first snap ring (11) and the second snap ring (12), one end of the first snap ring (11) and the second snap ring (12) are hinged, and the other end is provided with a fixed lug (15), and the fixed lug ( 15) are provided with connecting holes (16), and the outer walls of the first snap ring (11) and the second snap ring (12) are radially provided with threaded through holes, and the threaded through holes are provided with adjusting screw rods. (13), the adjusting screw (13) has a positioning card (14) on the spherical hinge in the ring where the first snap ring (11) is located, and the first snap ring (11) at the two ends of the magnetic traction device is connected with a A cylindrical guide rod (3) and a threaded guide rod (4) with equal outer diameters, and a first snap ring (11) is provided with a sliding sleeve between the cylindrical guide rod (3) and the threaded guide rod (4). An electromagnet (21), two cylindrical guide rods (3) are connected between the second snap rings (12) at both ends of the magnetic traction device, and the two cylindrical guide rods are connected between the second snap rings (12). (3) The upper sliding sleeve is provided with a second electromagnet (22), the first electromagnet (21) and the second electromagnet (22) are connected with a pulse power supply, and the magnetic traction device also includes a traction magnet , the traction magnetic block is attracted to the first electromagnet (21) and the second electromagnet (22) with opposite sexes. 2. A kind of magnetic traction device according to claim 1, is characterized in that: described first electromagnet (21) and second electromagnet (22) are semi-circular structure, and described first electromagnet ( The two ends of 21) are provided with rectangular protrusion, and the two ends of described second electromagnet (22) are provided with rectangular groove, and the width dimension of described rectangular protrusion is equal to the width dimension of rectangular groove, the length of rectangular protrusion The dimension is smaller than the length dimension of the rectangular groove. 3. A magnetic traction device according to claim 2, characterized in that: the threaded guide rod (4) is screwed with an adjustment mechanism (5), and the adjustment mechanism (5) includes an adjustment ring (51) , connecting column (53) and connecting ring (52), described adjusting ring (51) is axially provided with threaded hole (54) matching with threaded guide rod (4), described adjusting ring (51) and connecting ring (52) is fixedly connected by the connecting column (53), the section of the connecting ring (52) is circular, and the right end of the first electromagnet (21) is provided with the connecting ring (52) at the corresponding position of the adjusting mechanism (5). For the matching connecting groove (24), the circular arc where the groove wall of the section of the connecting groove (24) is located is a minor arc. 4. A magnetic traction device according to claim 3, characterized in that: the surface of the cylindrical guide rod (3) is provided with a length scale. 5. A magnetic traction device according to claim 4, characterized in that: the inner wall of the connecting hole (16) of the fixed ear plate (15) on the second snap ring (12) is axially provided with a connecting pin (121 ), the connecting pin (121) passes through the first snap ring (11) and one end of the fixed ear plate (15) is provided with a ball plunger (122), and the connecting hole (16 of the first snap ring (11) ) near the opening at one end of the second snap ring (12) is a rounded structure. 6. A magnetic traction device according to any one of claims 1 to 5, further comprising a magnetic traction method, characterized in that: comprising the following steps: a. Intramedullary fixation: Insert the intramedullary rod into the bone cavity so that the two ends of the intramedullary rod are respectively located in the broken bones at both ends, and then the broken bones at both ends of the intramedullary rod are respectively connected to the two ends of the intramedullary rod through intramedullary nails. Fix, and then perform minimally invasive osteotomy on one end of the intramedullary rod to form a distraction bone, and fix the traction magnet in the distraction bone; b. Timing traction: by connecting a power timer between the first electromagnet (21) and the second electromagnet (22) and the power supply, the first electromagnet (21) and the second electromagnet (22) are controlled at a specified time. work within the segment; c, oscillating traction: connect the pulse power supply in series between the first electromagnet (21), the second electromagnet (22) and the timing switch, form a pulse current by the pulse power supply, make the first electromagnet (21) and the second electromagnet The intensity of the magnetic field in (22) changes alternately, and then forms a changing gravitational force on the traction magnetic block fixed inside the bone, realizing the vibration traction to the bone. 7. A kind of magnetic traction device according to claim 6, characterized in that: the power supply parameters of the pulse power supply in step c are: within one T, the amplitude at the initial moment is 20V, moment amplitude is 24V, at moment is 20V, at The amplitude at the moment is 16V, and it is 20V at the moment of 1T.