CN109276301B

CN109276301B - Intramedullary and extramedullary combined electric bone lengthening device

Info

Publication number: CN109276301B
Application number: CN201810905062.5A
Authority: CN
Inventors: 刘济源; 刘学广; 周日同; 周求湛; 刘萍萍; 王俊
Original assignee: Yancheng Risheng Yueheng Intelligent Technology Co ltd
Current assignee: Yancheng Risheng Yueheng Intelligent Technology Co ltd
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2020-12-18
Anticipated expiration: 2038-08-09
Also published as: CN109276301A

Abstract

An intramedullary and extramedullary combined electric bone lengthening device relates to an orthopedic medical instrument. Two guide arms slidable mounting have fixed bone union piece one, activity bone union piece and gear box, the lead screw has connect the intramedullary screw thread sleeve soon, the lead screw link end rotates and passes intramedullary axle bed and fixed mounting has driven gear, be equipped with drive gear in the gear box, drive gear sets up with driven gear meshing, fixed bone union piece two is fixed with motor support, motor support is fixed with step motor, step motor output shaft outer end fixed mounting has drive gear and sets up with drive gear meshing, fixed bone union piece one, activity bone union piece, gear box and fixed bone union piece two are equipped with many bone nails respectively, the bone nail that corresponds with activity bone union piece can be fixed intramedullary screw thread sleeve, the bone nail that corresponds with gear box can be fixed intramedullary axle bed. Can prolong the extension of the skeleton in real time, shorten the treatment time and relieve the pain of patients.

Description

Intramedullary and extramedullary combined electric bone lengthening device

Technical Field

The invention relates to an orthopedic medical instrument, in particular to an intramedullary and extramedullary combined electric bone lengthening device.

Background

Bone lengthening is an effective method for treating limb shortening deformity and recovering or improving limb functions at present. The long tubular metaphyseal callus extension is a common osteotomy extension method which has the advantages of large extension length, quick bone healing, less damage, less relative complications, simplicity and feasibility. The term "means that the periosteum is preserved after metaphysis bone, and mesenchymal cells with strong osteogenesis ability in the periosteum can heal the bone through forming callus, and at the moment, a slow and continuous traction force is applied through the bone lengthening device, so that the callus formed at the osteotomy part can be lengthened slowly, and the purpose of bone lengthening is achieved.

Currently, external skin fixation is commonly adopted for bone lengthening devices, such as Ilizarov external fixation frames, single-arm external fixation frames, annular external fixation frames, combined external fixation frames and the like developed and derived from Ilizarov external fixation frames, which are connected with heavy external fixation devices through percutaneous penetrating needles (nails), so that the bone lengthening devices are inconvenient to move after being worn for a long time, and sequelae such as joint stiffness, needle (nail) tract infection, secondary osteomyelitis and the like are easily caused.

The utility model discloses a patent of utility model in the name of "bone extension internal fixation device" through bone nail snap-on backbone surface, has overcome through percutaneous needle (nail) external fixation's defect, alleviates patient's misery, has certain moulding ability in granted notice No. CN205458975U, granted notice day 2016 8 month 17. However, the device cannot control the extension length in real time when being adjusted, the extension length has great randomness, and once the extension length is too long or too short, the callus formation time can be prolonged, so that the treatment time of a patient is prolonged, the efficiency is low, and the reliability and the controllability are poor.

Disclosure of Invention

In order to solve the defects in the background technology, the invention provides an intramedullary and extramedullary combined electric bone lengthening device.

The invention adopts the following technical scheme: an intramedullary and extramedullary combined electric bone lengthening device comprises a first fixed bone combining part, a movable bone combining part, a gear box, a screw rod, a second fixed bone combining part, a stepping motor and two guide rods, wherein the first fixed bone combining part, the movable bone combining part and the gear box are arranged in parallel and are slidably installed on the two guide rods, the movable bone combining part is positioned between the first fixed bone combining part and the gear box, the screw rod is arranged between the two guide rods along the length direction, the screw rod is screwed with an intramedullary thread sleeve, the intramedullary thread sleeve is arranged corresponding to the movable bone combining part, the connecting end of the screw rod rotatably penetrates through an intramedullary shaft seat and is fixedly provided with a driven gear, the intramedullary shaft seat is arranged corresponding to the gear box, a transmission gear is arranged in the gear box, the transmission gear is meshed with the driven gear and is rotatably connected with a gear shaft, the second fixed bone combining part is fixed with a motor support, the motor support is fixed with a stepping motor, the outer end of an output shaft of the stepping motor is fixedly provided with a driving gear and is meshed with the driving gear, the first fixed bone combining part, the movable bone combining part, the gear box and the second fixed bone combining part are respectively provided with a plurality of bone nails, the plurality of bone nails corresponding to the movable bone combining part can fix the intramedullary thread sleeve, and the plurality of bone nails corresponding to the gear box can fix the intramedullary shaft seat.

Compared with the prior art, the invention has the beneficial effects that: the bone lengthening device has the advantages that the minimum lengthening length can reach 0.1mm, the precision is high, the stepping motor is controlled by the external driver, the bone can be stretched and lengthened constantly, stimulation can be increased, the treatment time is greatly shortened, the intramedullary and extramedullary device is detached after the lengthening is finished by adopting a fixing mode of combining intramedullary and extramedullary, the structure is compact, the applicability is high, extradermal fixation is not needed, and the pain of a patient is relieved.

Drawings

FIG. 1 is an isometric view of the overall construction of the intramedullary and extramedullary combination powered bone lengthening device of the present invention;

FIG. 2 is a schematic front view of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

fig. 4 is an isometric view of the transmission structure of the stepping motor and the lead screw of the invention.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.

The first embodiment is as follows: as shown in fig. 1 to 4, the invention discloses an intramedullary and extramedullary combined electric bone lengthening device, which comprises a first fixed bone combining part 2, a second movable bone combining part 3, a gear box 4, a screw rod 5, a second fixed bone combining part 7, a stepping motor 8 and two guide rods 1, wherein the first fixed bone combining part 2, the second movable bone combining part 3 and the gear box 4 are arranged in parallel and slidably arranged on the two guide rods 1, the movable bone combining part 3 is positioned between the first fixed bone combining part 2 and the gear box 4, the screw rod 5 is arranged between the two guide rods 1 along the length direction, the screw rod 5 is screwed with an intramedullary thread sleeve 5-1, the intramedullary thread sleeve 5-1 is arranged corresponding to the movable bone combining part 3, the connecting end of the screw rod 5 rotatably penetrates through an intramedullary shaft seat 6 and is fixedly provided with a driven gear 5-2, the intramedullary shaft seat 6 is arranged corresponding to the gear, a transmission gear 4-1 is arranged in the gear box 4, the transmission gear 4-1 is meshed with the driven gear 5-2, and is rotationally connected with a gear shaft 4-2 fixed at a corresponding position in the gear box 4, a motor bracket 7-1 is fixed on the fixed bone combining part II 7, a stepping motor 8 is fixed on the motor bracket 7-1, a driving gear 8-1 is fixedly arranged at the outer end of an output shaft of the stepping motor 8 and is meshed with the transmission gear 4-1, the fixed bone combining part I2, the movable bone combining part 3, the gear box 4 and the fixed bone combining part II 7 are respectively provided with a plurality of bone nails 9, wherein, a plurality of bone nails 9 corresponding to the movable bone combining part 3 can fix the intramedullary thread sleeve 5-1, and a plurality of bone nails 9 corresponding to the gear box 4 can fix the intramedullary shaft seat 6.

The second embodiment is as follows: as shown in fig. 1, in this embodiment, a first embodiment is further described, a wire guiding drum 7-2 is fixedly communicated with the motor support 7-1, the stepping motor 8 is controlled by an external driver, and a connecting wire connecting the stepping motor 8 and the external driver penetrates out of the wire guiding drum 7-2.

The third concrete implementation mode: as shown in fig. 4, in this embodiment, the first embodiment or the second embodiment is further described, the step angle of the stepping motor 8 is 1.8 °, the pitch of the lead screw 5 is 2mm, and the gear ratio between the driving gear 8-1 and the driven gear 5-2 is 1: 2.

The fourth concrete implementation mode: as shown in fig. 1, the present embodiment is further described with respect to the first embodiment, two ends of the two guide rods 1 are respectively provided with a through hole and are inserted with a positioning pin 1-1, and the positioning pin 1-1 can prevent the first fixed bone connector 2, the first movable bone connector 3 and the gear box 4 from slipping out of the two guide rods 1.

When the invention is used, firstly, a gap is transversely cut on the bone wall of a broken bone 12 at one side of a patient (the gap size is required to meet the effective meshing between a transmission gear 4-1 and a driven gear 5-2), the connecting end of a screw rod 5, together with the driven gear 5-2 and an intramedullary shaft seat 6, is inserted into the gap of the broken bone 12 at one side, wherein the driven gear 5-2 corresponds to the gap position, a bone cutting section 11 is sleeved on an intramedullary thread sleeve 5-1, then a gear box 4 and a fixed bone combining piece two 7 are respectively fixed on the broken bone 12 at one side by using bone nails 9, a movable bone combining piece 3 is fixed on the bone cutting section 11, a fixed bone combining piece one 2 is fixed on a broken bone 10 at the other side, the transmission effect among the driving gear 8-1, the transmission gear 4-1 and the driven gear 5-2 is ensured, and the intramedullary thread sleeve 5-1 and the intramedullary shaft seat 6 are respectively fixed by the, when the screw rod 5 rotates, the intramedullary thread sleeve 5-1 can drive the osteotomy segment 11 to axially move, the osteotomy segment 11 and the other side osteotomy 10 are arranged at a gap at the beginning, the two guide rods 1 can prevent the osteotomy segment 11 from angular displacement in the process of extension, the stepping motor 8 is well connected with an external driver outside the body through a connecting line (the external driver is provided with a power supply), the stepping angle of the stepping motor 8 is 1.8 degrees, the thread pitch of the screw rod 5 is 2mm, and the gear ratio of the driving gear 8-1 to the driven gear 5-2 is 1:2, therefore, if 20 pulses are given by the external driver, the stepping motor 8 drives the driving gear 8-1 to rotate 36 degrees, the screw rod 5 rotates 18 degrees, the intramedullary thread sleeve 5-1 drives the osteotomy segment 11 to move 0.1mm back to the other side osteotomy 10 to gradually realize the bone extension effect, and has higher precision, the reliability is high, the lead screw 5, the intramedullary thread sleeve 5-1, the driven gear 5-2 and the intramedullary shaft seat 6 form an intramedullary device, the other components form an extramedullary device, and the extramedullary device is completely removed after the elongation is finished.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An intramedullary and extramedullary combined electric bone lengthening device is characterized in that: the bone fracture fixation device comprises a first fixed bone combining part (2), a movable bone combining part (3), a gear box (4), a lead screw (5), a second fixed bone combining part (7), a stepping motor (8) and two guide rods (1), wherein the first fixed bone combining part (2), the movable bone combining part (3) and the gear box (4) are arranged in parallel and are slidably installed on the two guide rods (1), the movable bone combining part (3) is positioned between the first fixed bone combining part (2) and the gear box (4), the lead screw (5) is arranged between the two guide rods (1) along the length direction, the lead screw (5) is screwed with an intramedullary thread sleeve (5-1), the intramedullary thread sleeve (5-1) and the movable bone combining part (3) are correspondingly arranged, and the connecting end of the lead screw (5) rotatably penetrates through an intramedullary shaft seat (6) and is fixedly provided with a driven gear (5-, the intramedullary shaft seat (6) is arranged corresponding to the gear box (4), a transmission gear (4-1) is arranged in the gear box (4), the transmission gear (4-1) is meshed with the driven gear (5-2) and is rotationally connected with a gear shaft (4-2) fixed at a corresponding position in the gear box (4), a motor bracket (7-1) is fixed on the fixed bone connector II (7), a stepping motor (8) is fixed on the motor bracket (7-1), a driving gear (8-1) is fixedly arranged at the outer end of an output shaft of the stepping motor (8) and is meshed with the transmission gear (4-1), the fixed bone connector I (2), the movable bone connector (3), the gear box (4) and the fixed bone connector II (7) are respectively provided with a plurality of bone nails (9), wherein, a plurality of bone nails (9) corresponding to the movable bone joint (3) can fix the intramedullary thread sleeve (5-1), and a plurality of bone nails (9) corresponding to the gear box (4) can fix the intramedullary shaft seat (6).

2. The intramedullary and extramedullary combined electric bone lengthening device according to claim 1, wherein: the motor support (7-1) is fixedly communicated with a wire guide cylinder (7-2), the stepping motor (8) is controlled by an external driver, and a connecting wire for connecting the stepping motor (8) and the external driver penetrates out of the wire guide cylinder (7-2).

3. An intramedullary and extramedullary combined electric bone lengthening device according to claim 1 or 2, characterized in that: the stepping angle of the stepping motor (8) is 1.8 degrees, the thread pitch of the lead screw (5) is 2mm, and the gear ratio of the driving gear (8-1) to the driven gear (5-2) is 1: 2.

4. The intramedullary and extramedullary combined electric bone lengthening device according to claim 1, wherein: two ends of the two guide rods (1) are respectively provided with a through hole and are fixedly inserted with positioning pins (1-1), and the positioning pins (1-1) can prevent the fixed bone combination piece I (2), the movable bone combination piece (3) and the gear box (4) from sliding out of the two guide rods (1).