CN109276298B - Intramedullary and extramedullary combined rope sheave bone lengthening device - Google Patents

Abstract

An intramedullary and extramedullary combined rope pulley bone lengthening device relates to an orthopedic medical instrument. Two guide rods are fixed between the first fixing bone combining piece and the gear box. The movable bone combining part slides on the two guide rods, the screw rod is screwed with an intramedullary thread sleeve, the screw rod connecting end penetrates through the intramedullary shaft seat and is fixed with a driven gear, a hollow seat is fixed on the second fixed bone combining part, a rope pulley transmission frame is fixed on the hollow seat, a gear shaft is arranged between the gear box and the hollow seat in a rotating mode, one end of the gear shaft located in the gear box is fixedly provided with a transmission gear, the transmission gear is meshed with the driven gear, the rope pulley transmission frame can drive one end of the gear shaft located in the hollow seat to rotate, 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 intramedullary thread sleeve is fixed. 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 rope sheave bone lengthening device

Technical Field

The invention relates to an orthopedic medical instrument, in particular to a intramedullary and extramedullary combined rope 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 8month 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 marrow inside and outside combined rope wheel bone lengthening device.

The invention adopts the following technical scheme: a cord wheel and bone lengthening device combining inside and outside marrow comprises a first fixed bone combining part, a second movable bone combining part, a gear box, a lead screw, a second fixed bone combining part, a hollow seat, a cord wheel transmission frame 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 lead screw is arranged between the two guide rods along the length direction, the lead screw 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 lead screw 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 hollow seat, the cord wheel transmission frame is fixedly arranged on the hollow seat and is matched with the gear box, and, the one end fixed mounting that is located the gear box has drive gear, drive gear with driven gear meshing sets up, the rope sheave drive frame can drive the one end rotation that is located the gear shaft of hollow seat, fixed bone conjunction one, activity bone conjunction, gear box and fixed bone conjunction two are equipped with many bone nails respectively, and wherein, many bone nails that correspond with activity bone conjunction can be fixed the marrow internal thread sleeve, and many bone nails that correspond with the gear box can be fixed axle seat in the marrow.

Compared with the prior art, the invention has the beneficial effects that: the invention adjusts the skeleton extension length by combining the rope pulley transmission frame with a mechanism of a gear box driving screw rod, the minimum extension length can reach 0.2mm, the precision is high, the hand-rotating rope rod is convenient for stretching and extending the skeleton of a patient at any time, the stimulation is convenient to increase, the rapid extension is convenient, the treatment time is greatly shortened, a marrow inside and outside combined fixing mode is adopted, the marrow outside device is detached after the extension is finished, the structure is compact, the applicability is strong, the skin outside 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 combination sheave bone lengthening device of the present invention;

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

fig. 3 is an axonometric view of the transmission structure of the rope pulley transmission frame and the lead screw of the invention;

fig. 4 is an isometric view of the sheave drive frame of the present invention with the locking device in the locked condition;

fig. 5 is an isometric view of the sheave drive frame of the present invention with the locking device disengaged;

fig. 6 is an isometric view of two wire ropes of the sheave drive frame of the present 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 6, the invention discloses a marrow inside and outside combined rope 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, ahollow seat 8, a rope pulley transmission frame 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, thehollow seat 8 is fixedly arranged on the fixed bone combining part II 7, a rope wheel transmission frame is fixedly arranged on thehollow seat 8 and is matched with thegear box 4, a gear shaft 4-2 is rotatably arranged between thegear box 4 and thehollow seat 8, one end of the gear shaft 4-2 positioned in thegear box 4 is fixedly provided with a transmission gear 4-1, the transmission gear 4-1 is meshed with the driven gear 5-2, the rope wheel transmission frame can drive one end of a gear shaft 4-2 positioned in thehollow seat 8 to rotate, the fixed bone combining part I2, the movablebone combining part 3, thegear box 4 and the fixed bone combining part II 7 are respectively provided with a plurality ofbone nails 9, wherein, a plurality ofbone nails 9 corresponding to the movablebone combining part 3 can fix the intramedullary thread sleeve 5-1, and a plurality ofbone nails 9 corresponding to thegear box 4 can fix theintramedullary shaft seat 6.

The second embodiment is as follows: as shown in fig. 2, 3 and 4, in this embodiment, a first specific embodiment is further described, the sheave transmission frame includes arope drum 13, a manualrotation rope rod 14 and twosteel wire ropes 15, the bottom end of therope drum 13 is fixedly communicated with thehollow seat 8, the top end of therope drum 13 is fixedly provided with a rope rod shaft seat 13-1, the middle position of the manualrotation rope rod 14 is rotatably connected with the rope rod shaft seat 13-1, one end of each of the twosteel wire ropes 15 is respectively fixed and tightly wound on two sides of the manualrotation rope rod 14, the other end of each of the twosteel wire ropes 15 penetrates into thehollow seat 8 through therope drum 13, and is respectively fixed and tightly wound on a corresponding position of one end of the gear shaft 4-2 located in thehollow seat 8, and the diameters of the manualrotation rope rod 14, the gear shaft 4-2 and the.

The third concrete implementation mode: as shown in fig. 6, in this embodiment, the twowire ropes 15 are respectively wound in a spring shape in the directions of both sides, the winding directions of the same ends of the twowire ropes 15 are opposite, and the winding directions of both ends of eachwire rope 15 are the same.

The fourth concrete implementation mode: as shown in fig. 4 and 5, this embodiment is a further description of the second embodiment, and the hand-rotatedrope rod 14 is provided with anti-slip threads.

The fifth concrete implementation mode: as shown in fig. 3, 4 and 5, in this embodiment, a third or fourth embodiment is further explained, ascale disc 16 is fixedly sleeved on the position of the hand-rotatedrope lever 14 adjacent to the rope lever shaft seat 13-1, and thescale disc 16 and the rope lever shaft seat 13-1 can be locked by a locking device.

The sixth specific implementation mode: as shown in fig. 4 and 5, in this embodiment, a fifth embodiment is further described, the locking device includes apositioning pin 17 and alocking pressing piece 18, thescale disc 16 is uniformly provided with a plurality of positioning insertion holes at equal angles along the circumferential direction, any one of the positioning insertion holes of the rope shaft seat 13-1 and thescale disc 16 is correspondingly provided with a positioning pin through hole, the middle of the positioningpin 17 is slidably inserted into a mounting hole formed in the rope shaft seat 13-1, one end of thepositioning pin 17 is reversely bent to form an insertion head and can insert and position any one of the positioning insertion holes of thescale disc 16 and the positioning pin through hole of the rope shaft seat 13-1, and thelocking pressing piece 18 is mounted on the rope shaft seat 13-1 through a locking screw and can press thepositioning pin 17.

The seventh embodiment: as shown in fig. 3 and 5, in this embodiment, a sixth embodiment is further described, where the number of the plurality of positioning insertion holes of thescale disk 16 is 10, and the scale disk is sequentially provided with a number mark.

The specific implementation mode is eight: as shown in fig. 3, 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, together with the driven gear 5-2 and anintramedullary shaft seat 6, is 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 rope pulley transmission frame, 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 the corresponding bone, the manualrotation rope rod 14 is positioned outside the skin of a patient, the gap between theosteotomy section 11 and theother side osteotomy 10 is arranged initially, the manualrotation rope rod 14 can control thescrew rod 5 to rotate, the intramedullary thread sleeve 5-1 can drive theosteotomy section 11 to move axially 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 to the driven gear 5-2 is 2:1, the thread pitch of thescrew rod 5 is 1mm, the thread pitch of a single thread is equal to the lead, and the lead of thescrew rod 5 is 1mm, therefore, if the manualrotation rope rod 14 rotates the transmission gear 4-1 by 360 degrees (the diameters of the manualrotation rope rod 14, the gear shaft 4-2 and thescrew rod 5 are the same), the driven gear 5-2 rotates 720 degrees, namely, thescrew rod 5 rotates 720 degrees, and the intramedullary thread sleeve 5-1 moves 2mm axially, thescale disc 16 is evenly provided with 10 positioning jacks along the circumferential direction at equal angles, namely, the intramedullary thread sleeve 5-1 drives theosteotomy section 11 to move for 0.2mm when the hand-rotatedrope rod 14 rotates one hole, thereby realizing the bone lengthening function, having higher precision, positioning thescale disc 16 and the rope rod shaft seat 13-1 through the locking device, the intramedullary device has the advantages that the reliability is high, the winding directions of the same ends of the twosteel wire ropes 15 are opposite, the winding directions of the two ends of eachsteel wire rope 15 are the same, the effect is that the manualrotary rope rod 14 can be rotated in the forward and reverse directions, so that the moving direction of the intramedullary thread sleeve 5-1 is changed, 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 base 6 form the intramedullary device, the rest of the components form the extramedullary device, and the extramedullary device is completely detached after the extension is.

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 (8)

1. The utility model provides an intramedullary and extramedullary combination rope sheave 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 hollow seat (8), a rope pulley transmission frame 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 internal marrow thread sleeve (5-1), the internal marrow thread sleeve (5-1) is arranged corresponding to the movable bone combining part (3), the connecting end of the lead screw (5) rotatably penetrates through an internal marrow shaft seat (6) and is fixedly provided with a driven gear (5-2), the internal marrow shaft seat (6) is arranged corresponding to the gear box (4), a hollow seat (8) is fixedly installed on the second fixed bone combining part (7), a rope pulley transmission frame is fixedly installed on the hollow seat (8) and is matched with the gear box (4), a gear shaft (4-2) is rotatably arranged between the gear box (4) and the hollow seat (8), one end of the gear shaft (4-2) positioned in the gear box (4) is fixedly provided with a transmission gear (4-1), the transmission gear (4-1) is meshed with the driven gear (5-2), the rope pulley transmission frame can drive one end of the gear shaft (4-2) positioned in the hollow seat (8) to rotate, the first fixed bone combining part (2), the movable bone combining part (3), the gear box (4) and the second fixed bone combining part (7) are respectively provided with a plurality of bone nails (9), wherein the plurality of bone nails (9) corresponding to the movable bone combining part (3) can complement the internal thread sleeve (5) 1) The bone nails (9) corresponding to the gear box (4) can fix the intramedullary shaft seat (6).

2. The intramedullary and extramedullary combined rope wheel bone lengthening device according to claim 1, wherein: the rope wheel transmission frame comprises a rope drum (13), a hand-rotating rope rod (14) and two steel wire ropes (15), the bottom end of the rope drum (13) is fixedly communicated with a hollow seat (8), a rope rod shaft seat (13-1) is fixedly installed at the top end of the rope drum (13), the middle position of the hand-rotating rope rod (14) is rotatably connected with the rope rod shaft seat (13-1), one ends of the two steel wire ropes (15) are respectively fixed and tightly wound on two sides of the hand-rotating rope rod (14), the other ends of the two steel wire ropes (15) penetrate into the hollow seat (8) through the rope drum (13), the other ends of the two steel wire ropes are respectively fixed and tightly wound on a gear shaft (4-2) to be located at the corresponding position of one end in the hollow seat (8), and the diameters of the hand-rotating rope rod (14), the gear shaft (4.

3. The intramedullary and extramedullary combined rope wheel bone extension device of claim 2, wherein: the two steel wire ropes (15) are respectively wound in a spring shape towards the directions of two sides, the same ends of the two steel wire ropes (15) are opposite in winding direction, and the winding directions of the two ends of each steel wire rope (15) are the same.

4. The intramedullary and extramedullary combined rope wheel bone extension device of claim 2, wherein: the hand-rotating rope rod (14) is provided with anti-skidding lines.

5. An intramedullary and extramedullary combined rope wheel bone lengthening device according to claim 3 or 4, characterized in that: a scale disc (16) is fixedly sleeved at the position of the hand-rotating rope rod (14) adjacent to the rope rod shaft seat (13-1), and the scale disc (16) and the rope rod shaft seat (13-1) can be locked through a locking device.

6. The intramedullary and extramedullary combined rope wheel bone extension device of claim 5, wherein: the locking device comprises a positioning pin (17) and a locking pressing sheet (18), the scale disc (16) is uniformly provided with a plurality of positioning jacks at equal angles along the circumferential direction, any one of the positioning jacks of the rope rod shaft seat (13-1) and the scale disc (16) is correspondingly provided with a positioning pin perforation, the middle of the positioning pin (17) is inserted into a mounting hole formed in the rope rod shaft seat (13-1) in a sliding manner, one end of the positioning pin (17) is reversely bent to be provided with a plug-in connector and can position any one of the positioning jacks of the scale disc (16) and the positioning pin perforation of the rope rod shaft seat (13-1) in a plug-in manner, and the locking pressing sheet (18) is installed on the rope rod shaft seat (13-1) through a locking screw and can compress the positioning pin (17).

7. The intramedullary and extramedullary combined rope wheel bone extension device of claim 6, wherein: the number of the positioning jacks of the scale disc (16) is 10, and serial number marks are sequentially arranged on the positioning jacks.

8. The intramedullary and extramedullary combined rope wheel 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.

Images