CN109276300B

CN109276300B - Intramedullary and extramedullary combined bevel gear bone lengthening device

Info

Publication number: CN109276300B
Application number: CN201810904459.2A
Authority: CN
Inventors: 周日同; 周求湛; 刘济源; 刘学广; 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: CN109276300A

Abstract

An intramedullary and extramedullary combined bevel gear bone lengthening device relates to an orthopedic medical instrument. Two guide rods are fixed between a first fixed bone combining part and a gear box, a movable bone combining part slides on the two guide rods, a screw is screwed with an intramedullary thread sleeve, the connecting end of the screw penetrates through an intramedullary shaft seat and is fixed with a driven gear, a lower transmission gear in the gear box is meshed with the driven gear, a second fixed bone combining part is fixed with a bevel gear driving box, a transmission shaft rotates between the bevel gear driving box and the gear box, one end of the transmission shaft positioned in the gear box is fixed with an upper transmission gear, the upper transmission gear is meshed with the lower transmission gear, one end of the transmission shaft positioned in the bevel gear driving box is fixed with a transverse bevel gear, the transverse bevel gear is meshed with a vertical bevel gear, the upper end of the bevel gear driving box is fixedly communicated with a shaft barrel, a driving shaft rotates in the shaft barrel, and the. Can prolong the extension of the skeleton at any time and shorten the treatment time.

Description

Intramedullary and extramedullary combined bevel gear bone lengthening device

Technical Field

The invention relates to an orthopedic medical instrument, in particular to an intramedullary and extramedullary combined bevel gear 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 bone lengthening device for intramedullary and extramedullary combined bevel gears.

The invention adopts the following technical scheme: a marrow inside and outside combined bevel gear 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 bevel gear driving box and two guide rods, wherein the two guide rods are fixed between the first fixed bone combining part and the gear box in parallel, the movable bone combining part is slidably mounted on the two guide rods, the screw rod is arranged between the two guide rods along the length direction and is screwed with an intramedullary thread sleeve, 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, a lower transmission gear is arranged in the gear box and is rotatably connected with a gear shaft fixed in the gear box and is meshed with the driven gear, a bevel gear driving box is fixedly mounted on the second fixed bone combining part, and a transmission shaft is rotatably arranged between the bevel gear driving box and the gear box, the one end fixed mounting that is located the transmission shaft in the gear box has last drive gear, go up drive gear and lower drive gear meshing setting, the one end fixed mounting that is located the transmission shaft in the bevel gear drive box has horizontal bevel gear, horizontal bevel gear meshing has vertical bevel gear, and the fixed intercommunication in bevel gear drive box upper end has a shaft barrel, the shaft barrel internal rotation is provided with the driving shaft, the driving shaft lower extreme with vertical bevel gear rigid coupling, driving shaft upper end fixed mounting have handheld swing handle, fixed bone union piece one, activity bone union piece, gear box and fixed bone union piece two are equipped with many bone nails respectively, and wherein, many bone nails that correspond with activity bone union piece can fix the marrow internal thread sleeve, and many bone nails that correspond with the gear box can fix the marrow internal shaft seat.

Compared with the prior art, the invention has the beneficial effects that: the invention adjusts the skeleton extension length by the bevel gear driving box combined with the gear box driving screw rod mechanism, the minimum extension length can reach 0.1mm, the precision is high, the rotating handle is held by hand, the skeleton can be conveniently stretched and extended for a patient at any time, the stimulation can be conveniently increased, the treatment time can be 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 bevel gear 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 bevel gear drive housing and lead screw drive arrangement of the present invention;

FIG. 5 is a schematic view of the drive shaft and shaft cartridge of the present invention in a locked condition.

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 5, the invention discloses a marrow inside and outside combined bevel gear bone lengthening device, which comprises a fixed bone combining part I2, a movable bone combining part 3, a gear box 4, a screw rod 5, a fixed bone combining part II 7, a bevel gear driving box 8 and two guide rods 1, wherein the two guide rods 1 are fixed between the fixed bone combining part I2 and the gear box 4 in parallel, the movable bone combining part 3 is slidably arranged on the two guide rods 1, 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 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, a lower transmission gear 4-1 is arranged in the gear box 4, the lower transmission gear 4-1 is rotatably connected with a gear shaft 4-2 fixed in the gear box 4, the bevel gear driving box is fixedly arranged on the fixed bone combining part II 7, a transmission shaft 14 is rotatably arranged between the bevel gear driving box 8 and the gear box 4, an upper transmission gear 4-3 is fixedly arranged at one end of the transmission shaft 14 positioned in the gear box 4, the upper transmission gear 4-3 is meshed with a lower transmission gear 4-1, a transverse bevel gear 8-3 is fixedly arranged at one end of the transmission shaft 14 positioned in the bevel gear driving box 8, a vertical bevel gear 8-2 is meshed with the transverse bevel gear 8-3, a shaft barrel 8-1 is fixedly communicated with the upper end of the bevel gear driving box 8, a driving shaft 13 is rotatably arranged in the shaft barrel 8-1, the lower end of the driving shaft 13 is fixedly connected with the vertical bevel gear 8-2, and a handheld rotary handle 15 is fixedly arranged at the upper end of the driving shaft 13, 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 bone nails 9 corresponding to the movable bone combining part 3 can fix the intramedullary thread sleeve 5-1, and the 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 and 5, in this embodiment, a scale disc 15-1 is coaxially and fixedly mounted on the handheld rotary handle 15, and a scale indication arrow 8-4 is arranged on the upper end surface of the shaft cylinder 8-1.

The third concrete implementation mode: as shown in fig. 5, in this embodiment, a second specific embodiment is further described, the scale disk 15-1 is made of transparent plastic, ten radial scale marks are uniformly arranged on the scale disk 15-1 at equal angles, and the ten radial scale marks are sequentially provided with numbering marks.

The fourth concrete implementation mode: as shown in fig. 5, the third embodiment is further described, the upper end surface of the driving shaft 13 is larger than the connecting end of the handheld rotating handle 15, and a plurality of inserting holes 13-1 are uniformly formed in the circumference of the upper end surface of the driving shaft 13.

The fifth concrete implementation mode: as shown in fig. 5, in this embodiment, a fourth specific embodiment is further described, the number of the plurality of inserting holes 13-1 on the upper end surface of the driving shaft 13 is 10, and the inserting holes are arranged in one-to-one correspondence with ten radial scale marks on the scale disc 15-1.

The sixth specific implementation mode: as shown in fig. 5, in this embodiment, a fifth embodiment is further described, the driving shaft 13 and the shaft cylinder 8-1 can be locked, a positioning hole is formed on the upper end surface of the shaft cylinder 8-1, and the positioning hole and any one of the insertion holes 13-1 of the driving shaft 13 can be inserted and locked by an n-shaped bolt 16.

The seventh embodiment: as shown in fig. 4, this embodiment is a further description of the first embodiment, the gear ratio of the upper transmission gear 4-3 to the driven gear 5-2 is 1:3, and the pitch of the lead screw 5 is 3 mm.

When the invention is used, firstly, a gap (the gap size is required to meet the effective meshing between the lower transmission gear 4-1 and the driven gear 5-2) is transversely cut on the bone wall of the broken bone 12 at one side of a patient, the connecting end of the screw rod 5, the driven gear 5-2 and the intramedullary shaft seat 6 are inserted into the gap of the broken bone 12 at one side, wherein the driven gear 5-2 corresponds to the gap position, the intramedullary thread sleeve 5-1 is sleeved with the osteotomy section 11, then the gear box 4 and the fixed bone combining piece 7 are respectively fixed on the broken bone 12 at one side by the bone nail 9, the movable bone combining piece 3 is fixed on the osteotomy section 11, the fixed bone combining piece 2 is fixed on the broken bone 10 at the other side, the transmission efficiency among the bevel gear driving box 8, the gear box 4 and the screw rod 5 is ensured, and the intramedullary thread sleeve 5-1 and the intramedullary shaft seat 6 are respectively fixed by the corresponding bone nails 9, the hand-held rotary handle 15 is positioned outside the skin of a patient, the gap between the osteotomy section 11 and the osteotomy 10 on the other side is arranged initially, the hand-held rotary handle 15 can control the screw rod 5 to rotate, the intramedullary thread sleeve 5-1 can drive the osteotomy section 11 to move axially when the screw rod 5 rotates, the two guide rods 1 can prevent the osteotomy section 11 from angular displacement in the extension process, the gear ratio of the upper transmission gear 4-3 to the driven gear 5-2 is 1:3, the screw pitch of the screw rod 5 is 3mm, the screw pitch of the single thread is equal to the lead, and the lead of the screw rod 5 is 3mm, therefore, if the hand-held rotary handle 15 is rotated by 360 degrees manually, the upper transmission gear 4-3 is rotated by 360 degrees (the vertical bevel gear 8-2 is the same as the transverse bevel gear 8-3), the driven gear 5-2 is rotated by 120 degrees, namely, the screw rod 5 rotates by 120 degrees, and the intramedullary, the scale disc 15-1 is uniformly provided with ten radial scale marks at equal angles, namely, the intramedullary thread sleeve 5-1 drives the osteotomy section 11 to move for 0.1mm when the handheld rotary handle 15 rotates for one scale angle, so that the bone lengthening effect is realized, the high precision is achieved, the driving shaft 13 and the shaft barrel 8-1 can be inserted and positioned through the n-shaped bolt 16, the reliability is high, the moving direction of the intramedullary thread sleeve 5-1 can be changed by reversely rotating the handheld rotary handle 15, the problem of excessive lengthening caused by misoperation can be conveniently adjusted, the screw rod 5, the intramedullary thread sleeve 5-1, the driven gear 5-2 and the intramedullary shaft seat 6 form an intramedullary device, the rest parts form an extramedullary device, and the extramedullary device can be completely disassembled after the lengthening 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. The utility model provides an intramedullary and extramedullary awl gear bone extension fixture that combines 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 bevel gear driving box (8) and two guide rods (1), wherein the two guide rods (1) are fixed between the first fixed bone combining part (2) and the gear box (4) in parallel, 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 connecting end of the lead screw (5) rotatably penetrates through an intramedullary shaft seat (6) and is fixedly provided with a driven gear (5-2), a lower transmission gear (4-1) is arranged in the gear box (4), and the lower transmission gear (4-1) is rotatably connected with a gear shaft (4-2) fixed in the gear box (4), meanwhile, the bevel gear driving box is meshed with the driven gear (5-2), a bevel gear driving box (8) is fixedly mounted on the fixed bone combining part II (7), a transmission shaft (14) is rotatably arranged between the bevel gear driving box (8) and the gear box (4), an upper transmission gear (4-3) is fixedly mounted at one end of the transmission shaft (14) positioned in the gear box (4), the upper transmission gear (4-3) is meshed with the lower transmission gear (4-1), a transverse bevel gear (8-3) is fixedly mounted at one end of the transmission shaft (14) positioned in the bevel gear driving box (8), the transverse bevel gear (8-3) is meshed with a vertical bevel gear (8-2), the upper end of the bevel gear driving box (8) is fixedly communicated with a shaft barrel (8-1), and a driving shaft (13) is rotatably arranged in the shaft barrel (8-1), the lower end of the driving shaft (13) is fixedly connected with the vertical bevel gear (8-2), a handheld rotating handle (15) is fixedly mounted at the upper end of the driving shaft (13), 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 fix the intramedullary thread sleeve (5-1), and the plurality of bone nails (9) corresponding to the gear box (4) can fix the intramedullary thread sleeve (6).

2. The intramedullary and extramedullary combined bevel gear bone lengthening device according to claim 1, wherein: the handheld rotating handle (15) is coaxially and fixedly provided with a scale disc (15-1), and the upper end face of the shaft cylinder (8-1) is provided with a scale indication arrow (8-4).

3. The intramedullary and extramedullary combined bevel gear bone lengthening device according to claim 2, wherein: the scale disc (15-1) is made of transparent plastic, ten radial scale marks are uniformly arranged on the scale disc (15-1) at equal angles, and the ten radial scale marks are sequentially provided with numbering marks.

4. The intramedullary and extramedullary combined bevel gear bone lengthening device according to claim 3, wherein: the upper end face of the driving shaft (13) is larger than the connecting end of the handheld rotating handle (15), and a plurality of inserting holes (13-1) are uniformly formed in the periphery of the upper end face of the driving shaft (13) in the circumferential direction.

5. The intramedullary and extramedullary combined bevel gear bone lengthening device according to claim 4, wherein: the number of the plurality of inserting holes (13-1) on the upper end face of the driving shaft (13) is 10, and the inserting holes are arranged in one-to-one correspondence with the ten radial scale marks on the scale disc (15-1).

6. The intramedullary and extramedullary combined bevel gear bone lengthening device according to claim 5, wherein: the driving shaft (13) and the shaft barrel (8-1) can be locked, a positioning hole is formed in the upper end face of the shaft barrel (8-1), and the positioning hole and any one insertion hole (13-1) of the driving shaft (13) can be locked through insertion of an n-shaped bolt (16).

7. The intramedullary and extramedullary combined bevel gear bone lengthening device according to claim 1, wherein: the gear ratio of the upper transmission gear (4-3) to the driven gear (5-2) is 1:3, and the screw pitch of the screw rod (5) is 3 mm.