CN109259836B - Intramedullary and extramedullary combined belt pulley bone lengthening device - Google Patents

Abstract

An intramedullary and extramedullary combined belt pulley bone lengthening device relates to an orthopedic medical instrument. The two guide rods are fixed between the first fixed bone combining piece and the gear box, the movable bone combining piece slides on the two guide rods, the screw rod is screwed with an intramedullary thread sleeve, the connecting end of the screw rod penetrates through the intramedullary shaft seat in a rotating mode and is fixed with a driven gear, a belt pulley driving box is fixed on the second fixed bone combining piece, a gear shaft is arranged between the gear box and the belt pulley driving box in a rotating mode, a transmission gear and a lower transmission wheel are fixed on the gear shaft and meshed with the driven gear, a handheld rotary rod is arranged at the top end of the belt pulley driving box in a rotating mode, an upper transmission wheel is fixed on the handheld rotary rod, a transmission belt is sleeved on the lower transmission wheel and the upper transmission wheel, the first fixed bone combining piece, the movable bone combining piece, the gear box and the second. 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 belt pulley bone lengthening device

Technical Field

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

The invention adopts the following technical scheme: a intramedullary and extramedullary combined belt pulley 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 belt pulley driving box and two guide rods, wherein the two guide rods are arranged side by side and fixedly arranged between the first fixed bone combining part and the gear box, the movable bone combining part is slidably arranged on the two guide rods, 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 penetrates through an intramedullary shaft seat in a rotating manner and is fixedly provided with a driven gear, the intramedullary shaft seat is arranged corresponding to the gear box, the second fixed bone combining part is fixedly provided with the belt pulley driving box, the belt pulley driving box is arranged in a matching manner with the gear box, and a, the bone screw comprises a gear shaft, a driven gear, a belt wheel driving box, a flange plate shaft hole, a handheld rotating rod, a transmission wheel, a transmission belt, a first fixed bone combining piece, a movable bone combining piece, a gear box and a second fixed bone combining piece, wherein the two ends of the gear shaft are respectively and fixedly provided with the transmission gear and a lower transmission wheel, the transmission gear is arranged in the gear box and meshed with the driven gear, the top end of the belt wheel driving box is fixedly provided with the flange plate, the flange plate shaft hole is rotatably provided with the handheld rotating rod, the inner end of the handheld rotating rod is fixedly provided with the transmission wheel, the lower transmission wheel is arranged in the belt wheel driving box and is tightly sleeved with the transmission belt between the upper transmission wheel, the first fixed bone combining piece, the.

Compared with the prior art, the invention has the beneficial effects that: the invention adjusts the skeleton extension length by the belt wheel driving box combined with the gear box driving screw rod mechanism, the minimum extension length can reach 0.2mm, the precision is high, the rotating rod is held by hand, the skeleton can be conveniently stretched and extended for the patient at any time, the stimulation can be conveniently increased, the quick extension is convenient, the treatment time is greatly shortened, the intramedullary and extramedullary combined fixing mode is adopted, the extramedullary device is detached after the extension is finished, the structure is compact, the applicability is strong, the extradermal fixation is not needed, and the pain of the patient is relieved.

Drawings

FIG. 1 is an isometric view of the overall construction of the intramedullary and extramedullary binding pulley 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 drive arrangement for the hand-held screw and lead screw of the present invention;

FIG. 5 is a schematic view of the locking device of the scale disk and the flange plate of the present invention;

fig. 6 is a schematic view showing the structure of the locking device of the scale disk and the flange plate of the present invention when unlocked.

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 figures 1 to 6, the invention discloses a marrow inside and outside combined belt pulley bone lengthening device, which comprises a fixed bone combining part I2, a movablebone combining part 3, agear box 4, ascrew rod 5, a fixed bone combining part II 7, a beltpulley driving box 8 and twoguide rods 1, wherein the twoguide rods 1 are arranged in parallel and fixedly arranged between the fixed bone combining part I2 and thegear box 4, the movablebone combining part 3 is slidably arranged on the twoguide rods 1, thescrew rod 5 is arranged between the twoguide rods 1 along the length direction, thescrew rod 5 is screwed with an intramedullary thread sleeve 5-1, the intramedullary thread sleeve 5-1 is arranged corresponding to the movablebone combining part 3, the connecting end of thescrew rod 5 rotatably penetrates through anintramedullary shaft seat 6 and is fixedly provided with a driven gear 5-2, theintramedullary shaft seat 6 is arranged corresponding to thegear box 4, the beltpulley driving box 8 is fixedly arranged on the fixed bone combining part II 7, the beltwheel driving box 8 is matched with thegear box 4, a gear shaft 4-2 is rotatably arranged between thegear box 4 and the beltwheel driving box 8, two ends of the gear shaft 4-2 are respectively and fixedly provided with a transmission gear 4-1 and a lower transmission wheel 8-4, the transmission gear 4-1 is positioned in thegear box 4 and is meshed with the driven gear 5-2, the top end of the beltwheel driving box 8 is fixedly provided with a flange 8-1, a shaft hole of the flange 8-1 is rotatably provided with a handheld rotating rod 8-2, the inner end of the handheld rotating rod 8-2 is fixedly provided with an upper transmission wheel 8-3, the lower transmission wheel 8-4 is positioned in the beltwheel driving box 8 and is tightly sleeved with a transmission belt 8-5 between the lower transmission wheel and the upper transmission wheel 8-3, and the firstfixed bone connector 2, The movablebone combining part 3, thegear box 4 and the fixed bone combining part two 7 are respectively provided with a plurality ofbone nails 9, wherein thebone nails 9 corresponding to the movablebone combining part 3 can fix the intramedullary thread sleeve 5-1, and thebone nails 9 corresponding to thegear box 4 can fix theintramedullary shaft seat 6.

The second embodiment is as follows: as shown in fig. 3, 5 and 6, this embodiment is further described as a first embodiment, and the scale disc 8-6 is fixedly sleeved on the handheld rotary rod 8-2 outside the flange 8-1.

The third concrete implementation mode: as shown in fig. 5 and 6, in this embodiment, a locking device is further described with respect to the second embodiment, the locking device is disposed between the scale disc 8-6 and the flange 8-1, the locking device includes alocking bolt 14 and alocking pressing sheet 15, the scale disc 8-6 is uniformly provided with a plurality ofpositioning insertion holes 13 at equal angles along its circumferential direction, the outer surface of the flange 8-1 and the plurality ofpositioning insertion holes 13 are provided with a plurality of positioning blind holes in one-to-one correspondence, the edge of the outer surface of the flange 8-1 is provided with a bolt hole and a locking screw is installed at an adjacent position, thelocking bolt 14 is n-shaped, one end of thelocking bolt 14 is rotatably inserted into the bolt hole, the other end of thelocking bolt 14 is inserted into any one of thepositioning insertion holes 13 and the corresponding positioning blind hole, so as to position the scale disc 8-6 and the flange 8-1, one end of the locking pressingpiece 15 is rotatably arranged on the locking screw, and the other end of thelocking pressing piece 15 can be tightly pressed on thelocking bolt 14 to prevent falling off.

The fourth concrete implementation mode: as shown in fig. 5 and 6, in the present embodiment, a third specific embodiment is further described, the number of the plurality ofpositioning insertion holes 13 of the scale disc 8-6 and the number of the plurality of positioning blind holes of the flange plate 8-1 are 10, and the plurality ofpositioning insertion holes 13 of the scale disc 8-6 are sequentially provided with a number mark.

The fifth concrete implementation mode: as shown in fig. 4, the first embodiment is further described, the gear ratio of the transmission gear 4-1 to the driven gear 5-2 is 2:1, and the pitch of thelead screw 5 is 1 mm.

When the invention is used, firstly, a gap is transversely cut on the bone wall of abroken 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 ascrew rod 5, the driven gear 5-2 and anintramedullary shaft seat 6 are inserted into the gap of thebroken bone 12 at one side, wherein the driven gear 5-2 corresponds to the gap position, abone cutting section 11 is sleeved on an intramedullary thread sleeve 5-1, then agear box 4 and a fixedbone combining piece 7 are respectively fixed on thebroken bone 12 at one side by usingbone nails 9, a movablebone combining piece 3 is fixed on thebone cutting section 11, a fixedbone combining piece 2 is fixed on abroken bone 10 at the other side, the transmission efficiency among a beltwheel driving box 8, thegear box 4 and thescrew rod 5 is ensured, and the intramedullary thread sleeve 5-1 and theintramedullary shaft seat 6 are respectively fixed by thecorresponding bone nails 9, the top end of the beltwheel driving box 8 is positioned outside the skin of a patient, theosteotomy section 11 and theosteotomy 10 at the other side are arranged at a gap initially, the manual rotation of the hand-held rotary rod 8-2 can control the rotation of thescrew rod 5, the intramedullary thread sleeve 5-1 can drive theosteotomy section 11 to axially move when thescrew rod 5 rotates, the twoguide rods 1 can prevent theosteotomy section 11 from angular displacement in the extension process, the gear ratio of the transmission gear 4-1 and the driven gear 5-2 is 2:1, therefore, if the manual rotation of the hand-held rotary rod 8-2 at 180 degrees enables the transmission gear 4-1 to rotate at 180 degrees (the size of the upper transmission wheel 8-3 is consistent with that of the lower transmission wheel 8-4), the driven gear 5-2 rotates at 360 degrees, namely thescrew rod 5 rotates at 360 degrees, the screw pitch of thescrew rod 5 is 1mm, the screw pitch of a single thread is, the intramedullary thread sleeve 5-1 moves 1mm axially, and the scale disk 8-6 is divided into 10 number marks corresponding to thepositioning insertion holes 13, namely, when the hand-held rotating rod 8-2 rotates for an angle of a numbered mark, the intramedullary thread sleeve 5-1 drives theosteotomy segment 11 to move for 0.2mm, thereby realizing the bone extension function, having higher precision, positioning the scale disc 8-6 and the flange plate 8-1 through the locking device, the intramedullary device is high in reliability, the moving direction of the intramedullary thread sleeve 5-1 can be changed by changing the steering of the handheld rotary rod 8-2, the problem of excessive extension caused by misoperation can be conveniently adjusted, thelead screw 5, the intramedullary thread sleeve 5-1, the driven gear 5-2 and theintramedullary shaft seat 6 form the intramedullary device, the other components form the extramedullary device, and the extramedullary device is completely detached after extension 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 (5)

1. The utility model provides an intramedullary and extramedullary combination belt pulley bone extension fixture which characterized in that: 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 belt pulley driving box (8) and two guide rods (1), wherein the two guide rods (1) are arranged in parallel and fixedly arranged between the first fixed bone combining part (2) and the gear box (4), the movable bone combining part (3) is slidably arranged on the two guide rods (1), 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) is arranged corresponding to the movable bone combining part (3), the connecting end of the lead screw (5) rotatably passes through an intramedullary shaft seat (6) and is fixedly provided with a driven gear (5-2), and the intramedullary shaft seat (6) is arranged corresponding to the gear box (4), a belt pulley driving box (8) is fixedly installed on the fixed bone connector II (7), the belt pulley driving box (8) is matched with the gear box (4), a gear shaft (4-2) is rotatably arranged between the gear box (4) and the belt pulley driving box (8), two ends of the gear shaft (4-2) are respectively and fixedly provided with a transmission gear (4-1) and a lower transmission wheel (8-4), the transmission gear (4-1) is positioned in the gear box (4) and meshed with the driven gear (5-2), a flange plate (8-1) is fixedly installed at the top end of the belt pulley driving box (8), a hand-held rotary rod (8-2) is rotatably installed in a shaft hole of the flange plate (8-1), and an upper transmission wheel (8-3) is fixedly installed at the inner end of the hand-held rotary rod (8-2), the lower transmission wheel (8-4) is positioned in the belt pulley driving box (8) and is tightly sleeved with a transmission belt (8-5) between the upper transmission wheel (8-3), the fixed bone combining piece I (2), the movable bone combining piece (3), the gear box (4) and the fixed bone combining piece II (7) are respectively provided with a plurality of bone nails (9), wherein the bone nails (9) corresponding to the movable bone combining piece (3) can fix the intramedullary thread sleeve (5-1), and the bone nails (9) corresponding to the gear box (4) can fix the intramedullary thread sleeve (6).

2. The intramedullary and extramedullary combined pulley bone lengthening device according to claim 1, wherein: the scale disc (8-6) is fixedly sleeved on the outer side of the flange plate (8-1) of the handheld rotary rod (8-2).

3. The intramedullary and extramedullary combined pulley bone lengthening device according to claim 2, wherein: a locking device is arranged between the scale disc (8-6) and the flange plate (8-1), the locking device comprises a locking bolt (14) and a locking pressing sheet (15), the scale disc (8-6) is uniformly provided with a plurality of positioning jacks (13) at equal angles along the circumferential direction, the outer surface of the flange plate (8-1) and the plurality of positioning jacks (13) are provided with a plurality of positioning blind holes in a one-to-one correspondence manner, the edge of the outer surface of the flange plate (8-1) is provided with a bolt hole, a locking screw is arranged at the adjacent position of the bolt hole, the locking bolt (14) is n-shaped in appearance, one end of the locking bolt (14) is rotatably inserted into the bolt hole, the other end of the locking bolt (14) can be inserted into any positioning jack (13) and the corresponding positioning blind hole thereof, so as to position the scale disc (8-6) and the flange plate (8-1, one end of the locking pressing piece (15) is rotatably arranged on the locking screw, and the other end of the locking pressing piece (15) can be tightly pressed on the locking bolt (14) to prevent falling off.

4. The intramedullary and extramedullary combined pulley bone lengthening device according to claim 3, wherein: the number of the positioning jacks (13) of the scale disc (8-6) and the number of the positioning blind holes of the flange plate (8-1) are 10, and the positioning jacks (13) of the scale disc (8-6) are sequentially provided with numbering marks.

5. The intramedullary and extramedullary combined pulley bone lengthening device according to claim 1, wherein: the gear ratio of the transmission gear (4-1) to the driven gear (5-2) is 2:1, and the screw pitch of the lead screw (5) is 1 mm.

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