CN111134823A

CN111134823A - Adjustable intramedullary nail

Info

Publication number: CN111134823A
Application number: CN202010035295.1A
Authority: CN
Inventors: 虞佩
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-05-12

Abstract

The invention discloses an adjustable intramedullary nail, which comprises an upper nail body, a lower nail body and a sliding rack, wherein the upper nail body is fixed on the upper nail body; a driving cavity is arranged inside the upper section nail body, and a driving gear, a speed reducing device, a driving motor and a battery are arranged in the driving cavity; the battery is connected with the driving motor and provides power for the driving motor; the driving motor drives the driving gear to rotate through a speed reducing device; the bottom end of the sliding rack is fixed in the lower section nail body, and the upper end of the sliding rack is inserted into the driving cavity and meshed with the driving gear; the upper end of the upper section nail body and the lower end of the lower section nail body are respectively provided with a fixing nail penetrating through the nail body. The scheme adopts minimally invasive implantation, effectively prolongs the affected limb of a patient through external control, bears load in early stage, and ensures that the straight growth of a bone is prolonged by intramedullary fixation maintaining force.

Description

Adjustable intramedullary nail

Technical Field

The invention relates to the field of medical instruments, in particular to an adjustable intramedullary nail.

Background

When the condition such as unequal limb length or abnormal limb development caused by congenital or acquired disease is treated, the method of prolonging the affected limb is usually adopted. However, the existing methods for extending the affected limb are very limited, and not only have poor curative effect, but also are unstable.

The existing methods for extending the affected limb mainly comprise the following two methods:

one is to fix the support outside through illzarov, this method is not only very inconvenient to use, the patient is easy to infect when using, and can't guarantee to prolong bone and keep growing straightly, can't function exercise early, the scar is more, so although can lengthen limbs, the function is very poor, even serious infects the person and leads to amputation.

The other method is that the Masquelet technology is used for treating bone defects, bone cement and intramedullary nail technology are used after bone cutting, and limbs are lengthened through a membrane bone formation technology, but the method needs to take autologous ilia of a patient as bone filling materials, the mode of dismantling the east wall and filling the west wall can cause defects of iliac regions, besides, the mode is that the lower limbs are lengthened once, nerve vessels are easily stretched quickly to cause damage, the incisions are large, and the operation frequency is large.

Therefore, a better method for extending the affected limb is urgently needed.

Disclosure of Invention

The purpose of the invention is: the utility model provides an adjustable intramedullary nail, it can be through the length of built-in driving motor adjustment nail body, and driving motor passes through external control, and the operation number of times is few, is difficult for infecting, and recovery effect is better.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an adjustable intramedullary nail comprises an upper nail body, a lower nail body and a sliding rack; a driving cavity is arranged inside the upper section nail body, and a driving gear, a speed reducing device, a driving motor and a battery are arranged in the driving cavity; the battery is connected with the driving motor and provides power for the driving motor; the driving motor drives the driving gear to rotate through a speed reducing device; the bottom end of the sliding rack is fixed in the lower section nail body, and the upper end of the sliding rack is inserted into the driving cavity and meshed with the driving gear; the upper end of the upper section nail body and the lower end of the lower section nail body are respectively provided with a fixing nail penetrating through the nail body.

According to the technical scheme, the driving motor is provided with a wireless remote control switch, and the wireless remote control switch is connected with the driving motor and controls the driving motor to work or stop.

According to the technical scheme, the inner wall of the upper section nail body is fixedly provided with a plurality of sliding rails, and the sliding racks are mounted on the sliding rails.

According to the technical scheme, the lower section of nail body is further fixedly provided with a sliding connecting rod, the bottom end of the sliding connecting rod is fixedly connected with the lower section of nail body, and the upper portion of the sliding connecting rod is arranged on a sliding rail in the upper section of nail body.

According to the technical scheme, the front face of the sliding rack is provided with tooth marks, the back face of the sliding rack is provided with a rack sliding groove, and the side face of the sliding rack is provided with a rack limiting column.

Further optimize technical scheme, the bottom both sides of slide rail are equipped with two stopper.

Further optimize technical scheme, the both ends of staple are equipped with respectively and are followed closely perpendicular enhancement nail with it.

The invention has the beneficial effects that:

1. the length of the intramedullary nail can be adjusted at will: this scheme provides power for driving motor through built-in battery, through the length of slip rack extension intramedullary nail to make the affected limb extension.

2. Minimally invasive implantation: compared with the traditional intramedullary nail, the scheme adopts a minimally invasive inlet, is convenient to implant, does not need an additional incision during rehabilitation, and has fewer scars and more attractive appearance after rehabilitation.

3. And (3) implantation safety: the intramedullary nail is fixed in the medullary, and a nail channel communicated with the outside does not exist, so that the infection probability is greatly reduced, the adjustment straight line of the intramedullary nail is prolonged, and the limb deformation or complete risk can not occur.

4. The influence is little: through intramedullary fixation, the weight can be loaded in early stage, and the function exercise of the limbs in early stage is allowed, thereby having little influence on the daily life.

Drawings

Fig. 1 is a schematic view of the external structure of the present invention.

Fig. 2 is a schematic view of the internal structure of the present invention.

Fig. 3 is a schematic cross-sectional view of the shank.

Fig. 4 is a schematic view of the reduction gear structure.

Fig. 5 is a schematic view of a first rotor structure.

Fig. 6 is a schematic view of a second rotor structure.

Fig. 7 is a schematic view of a third rotor structure.

Fig. 8 is a schematic view of the structure of the sliding rack.

Fig. 9 is a schematic structural view of the slide link.

In the figure: 10-upper section nail body, 20-lower section nail body, 30-sliding rack, 40-sliding connecting rod, 50-fixing nail and 51-reinforcing nail; 11-driving gear, 12-speed reducer, 13-driving motor, 14-battery, 15-sliding rail and 16-limiting block; 31-tooth marks, 32-rack sliding grooves and 33-rack limiting columns; 1211-first rotor upper gearwheel, 1212-first rotor lower gearwheel, 1221-second rotor lower gearwheel, 1222-second rotor upper gearwheel, 123-third rotor.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, one embodiment of the adjustable intramedullary nail of the present invention comprises an upper nail body 10 and a lower nail body 20; wherein, the upper section nail body 10 and the lower section nail body 20 are connected through a sliding rack 30 and a sliding connecting rod 40. The upper end of the upper nail body 10 and the lower end of the lower nail body 20 are respectively provided with a fixing nail 50 penetrating through the nail body.

As shown in fig. 2, the upper staple body 10 is provided with a driving chamber therein, and a driving gear 11, a driving motor 13, a speed reducer 12, a battery 14 and a slide rail 15 are provided in the driving chamber.

The battery 14 is connected to the drive motor 13 to supply power thereto.

The driving motor 13 is connected with the power input end of the speed reducing device 12, and the power output end of the speed reducing device 12 is connected with the driving gear 11; therefore, the driving motor 13 rotates the driving gear 11 after the rotational speed is reduced by the reduction gear 12.

The driving gear 11 is engaged with the sliding rack 30, the sliding rack 30 is mounted on the sliding rail 15, and the sliding rack 30 is driven to slide up and down by the rotation of the driving gear 11.

Wherein, the slide rail 15 includes 2, and the symmetry is fixed on the inner wall of upper segment nail body 10.

Wherein, the upper end of the sliding rack 30 is installed on the sliding rail 15, and the lower end thereof is fixedly connected with the lower section nail body 20.

The lower end of the sliding connecting rod 40 is fixed in the lower nail body 20, and the top end thereof is mounted on the sliding rail 15 opposite to the sliding rack 30 in the upper nail body 10.

As shown in fig. 3, reinforcing nails 51 perpendicular to the fixing nails 50 are provided at both ends thereof, respectively. The reinforced nail can strengthen the holding force on the bone, thereby enhancing the support and preventing the proximal rotation.

There are various transmissions capable of achieving this function in the related art regarding the structure of the reduction gear 12, and the present embodiment exemplifies only one of the simplest structures, and as shown in fig. 4, the reduction gear 12 includes a first rotor 121, a second rotor 122, and a third rotor 123.

Specifically, as shown in fig. 5-7, the first rotor 121 includes a first rotor upper gear 1211 and a first rotor lower gear 1212. The second rotor 122 includes a second rotor upper gear 1221 and a second rotor lower gear 1222. The third rotor 123 is coaxial with the drive gear 11, and the drive gear 11 is located at an upper portion thereof. The first rotor upper gear 1211 is engaged with a gear on the rotation shaft of the driving motor, the first rotor lower gear 1212 is engaged with the second rotor lower gear 1222, the second rotor upper gear 1221 is engaged with a gear of the third rotor 123, and the driving gear 11 is engaged with the sliding rack 30. Further, the number of teeth of the first rotor upper gear 1211 is smaller than that of the first rotor lower gear 1212, and the number of teeth of the second rotor upper gear 1221 is larger than that of the second rotor lower gear 1222; the number of teeth of the drive gear 11 is larger than that of the third rotor 123.

As shown in fig. 8, the sliding rack 30 has a tooth trace 31 on the top surface, a rack runner 32 on the back surface, and a rack stopper 33 on the side surface. Two limiting blocks 16 are arranged on two sides of the bottom of the sliding rail 15, and when the sliding rack 30 slides to a certain position, the rack limiting column 31 is abutted against the limiting blocks 16, so as to limit the further sliding of the sliding rack, and the maximum adjusting length of the intramedullary nail is adjusted.

As shown in fig. 9, the sliding link 40 has a structure similar to that of the sliding rack 30 except that the top surface thereof is not provided with teeth marks, i.e., the back surface thereof is provided with a link sliding groove 41 and the side surface thereof is provided with a link stopper 42. The sliding link 40 is mounted on the slide rail 15 opposite the sliding rack 30.

In addition, the driving motor 13 is also provided with a wireless remote control switch which controls the telescopic length of the nail body by receiving a control signal of an external control console.

The adjustable intramedullary nail designed by the inventor utilizes the minimally invasive implantation of the intramedullary nail, bears load in the early stage and ensures that the intramedullary fixation maintains the force line to prolong the linear growth of the bone energy. Meanwhile, an electromagnetic battery technology is adopted, an electromagnetic principle is applied, the rotation force is converted into the propelling force by controlling the motor of the intramedullary nail in the body to rotate in vitro, the intramedullary nail is pushed to stretch, the skeleton per se is slowly lengthened, the skeleton per se is stretched into the bone, the growth of the new bone is induced, and the purpose of lengthening the affected limb is achieved. Through the novel adjustable intramedullary nail, minimally invasive implantation, in-vitro control, early bearing, early function rehabilitation exercise can safely and effectively prolong the affected limb of a patient. The device has wide application prospect.

The basic principles and the main features of the solution and the advantages of the solution have been shown and described above. It will be understood by those skilled in the art that the present solution is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principles of the solution, but that various changes and modifications may be made to the solution without departing from the spirit and scope of the solution, and these changes and modifications are intended to be within the scope of the claimed solution. The scope of the present solution is defined by the appended claims and equivalents thereof.

Claims

1. An adjustable intramedullary nail is characterized by comprising an upper nail body, a lower nail body and a sliding rack; a driving cavity is arranged inside the upper section nail body, and a driving gear, a speed reducing device, a driving motor and a battery are arranged in the driving cavity; the battery is connected with the driving motor and provides power for the driving motor; the driving motor drives the driving gear to rotate through a speed reducing device; the bottom end of the sliding rack is fixed in the lower section nail body, and the upper end of the sliding rack is inserted into the driving cavity and meshed with the driving gear; the upper end of the upper section nail body and the lower end of the lower section nail body are respectively provided with a fixing nail penetrating through the nail body.

2. The adjustable intramedullary nail of claim 1, wherein said drive motor has a wireless remote switch connected to said drive motor.

3. The adjustable intramedullary nail of claim 1, wherein a plurality of sliding rails are fixed to an inner wall of the upper nail body, and the sliding rack is mounted on the sliding rails.

4. The adjustable intramedullary nail of claim 3, wherein a sliding link is further fixed to the lower nail body, a bottom end of the sliding link is fixedly connected to the lower nail body, and an upper portion of the sliding link is mounted on a sliding rail in the upper nail body.

5. The adjustable intramedullary nail of claim 3, wherein two stops are provided on either side of the bottom of the rail.

6. The adjustable intramedullary nail of claim 1, wherein the sliding rack has teeth marks on a front surface thereof, a rack sliding groove on a back surface thereof, and a rack retaining post on a side surface thereof.

7. The adjustable intramedullary nail of claim 1, wherein the fixation pin is provided with a reinforcing pin at each end perpendicular thereto.