A rotation adjustment mechanism for an external fixator used for correction of limb deformity

Abstract

The present invention discloses a rotation adjustment mechanism of an external fixator for correction of limb deformity, comprising: a first fixing ring; a second fixing ring, which is arranged opposite to the first fixing ring, and a plurality of second circular holes are provided on the second fixing ring; a threaded column, which has an external thread, and one end of the threaded column is fixedly provided on the first fixing ring after passing through the first circular hole; an adjustment guide rod, one end of which has a first through hole, and the other end of which has an external thread, and the threaded column is provided in the first through hole; a clamping mechanism, which is detachably provided on the second fixing ring; a connecting plate, the upper part of which has a second through hole, and the lower part of which is fixedly provided on the second fixing ring after passing through the second circular hole; and a nut mechanism, which is matched and provided at the external thread of the adjustment guide rod. By adjusting the position of the nut mechanism on the adjustment guide rod, the connecting plate drives the second fixing ring to rotate, thereby realizing the position adjustment of the second fixing ring.

Description

Technical Field

[0001] The invention relates to a rotation mechanism, in particular to a rotation adjustment mechanism of an external fixator for correcting limb deformity. Background Art

[0002] At present, there are many deformity correction problems in orthopedic clinics. The introduction and development of Ilizarov orthopedic technology has brought about a leap forward in orthopedic deformity correction. The Ilizarov external fixator has unique advantages that are unmatched by other orthopedic devices, but its component design still has defects and a single configuration. These design defects greatly limit the application and further promotion of the Ilizarov external fixator. In the existing bone external fixators, how to compactly and concisely combine components such as intramedullary nails with the external fixator; how to rotate the hole ring angle; how to adjust the relative position of the hole ring; how to effectively apply the traction regeneration method, etc., rely more on the subjective experience of medical staff. Adjusting the bone external fixator is time-consuming and laborious, which will have a greater adverse effect on the function of the bone external fixator and the comfort of patients wearing the external fixator. Summary of the invention

[0003] The present invention designs and develops a rotation adjustment mechanism for an external fixator for correction of limb deformities. By adjusting the position of a nut mechanism on an adjusting guide rod, the clamping mechanism is loosened to cooperate with a second fixing ring, so that the connecting piece drives the second fixing ring to rotate, thereby realizing position adjustment of the second fixing ring.

[0004] Another object of the present invention is to make the linear clamping mechanism and the second fixing ring in linear contact and detachable manner by cooperating with the linear clamping piece and the fixing clip.

[0005] The technical solution provided by the present invention is:

[0006] A rotation adjustment mechanism of an external fixator for correction of limb deformity, comprising:

[0007] A first fixing ring, on which a plurality of first circular holes are circumferentially formed;

[0008] A second fixing ring, which is arranged opposite to the first fixing ring, and the second fixing ring is provided with a plurality of second circular holes along the circumferential direction;

[0009] A threaded column, one end of which passes through the first circular hole and is fixedly disposed on the first fixing ring;

[0010] An adjusting guide rod, one end of which is provided with a first through hole;

[0011] A clamping mechanism, which is detachably arranged on the second fixing ring and can move circumferentially along the second fixing ring, and the other end of the threaded column is fixed to the top of the clamping mechanism;

[0012] A connecting piece, one end of which is provided with a second through hole, and the other end of which passes through the second circular hole and is fixedly arranged on the second fixing ring;

[0013] Wherein, the other end of the threaded column passes through the first through hole and is positioned by two first positioning nuts, and the other end of the adjusting guide rod passes through the second through hole and is positioned by two second positioning nuts.

[0014] Preferably, the clamping mechanism comprises:

[0015] A linear clamping member, which is arranged on the second fixing ring, support columns are symmetrically arranged at both ends of the linear clamping member, and the second fixing ring is arranged between the support columns;

[0016] A fixing clip, which is arranged at the bottom of the second fixing ring, and third through holes are symmetrically opened at both ends of the fixing clip;

[0017] Wherein, the support column has an external thread, and the support column is positioned by a third positioning nut after passing through the third through hole.

[0018] Preferably, tapered portions are symmetrically provided at both ends of the bottom of the linear clamping member for clamping and linearly contacting the second fixing ring.

[0019] Preferably, one end of the support column is fixedly disposed on the tapered portion.

[0020] Preferably, a limiting nut is further provided on the adjusting guide rod, which is matched with the external thread of the adjusting guide rod and is located between the second positioning nut and the first through hole and close to the threaded column.

[0021] Preferably, the connecting piece further comprises:

[0022] A pressing portion, which is arranged in the middle of the connecting piece, the pressing portion is a cylindrical structure, and the diameter of the pressing portion is larger than the diameter of the second circular hole;

[0023] The external threaded portion is arranged at the lower part of the connecting piece.

[0024] Preferably, the external threaded portion passes through the second circular hole and is fixed by a fourth nut, so that the pressing portion is pressed against the second fixing ring.

[0025] Preferably, the plurality of first circular holes are arranged on the first fixing ring at equal intervals along the circumferential direction.

[0026] Preferably, the plurality of second circular holes are arranged on the second fixing ring at equal intervals along the circumferential direction.

[0027] Beneficial effects of the present invention: Based on a full analysis of the adjustment principle of the Ilizarov bone external fixator, the present invention proposes a bone external fixator rotation adjustment mechanism for limb deformity correction, which can realize the rotation of the lower end ring relative to the upper end fixed ring and the adjustment of various angles, and when two or more groups of mechanisms are used in combination, the relative positions of the two rings can be guaranteed to remain unchanged. The mechanism is cleverly designed, reliable, occupies little space, can be applied to the correction of various complex limb deformities, and has high clinical application value and good clinical application prospects.

[0028] The linear clamping member is in linear contact with the lower fixing ring, and the linear clamping mechanism can be fixed on the lower fixing ring by squeezing the fixing clip and the third positioning nut, which is convenient and flexible to install. The contact and fixing method is cleverly designed.

[0029] The adjusting guide rod can rotate freely with the change of the lower end fixing ring, and the two second positioning nuts on the adjusting guide rod can be adjusted to achieve fine adjustment of the relative rotation of the upper and lower fixing rings. Loosen the fixing clips and nuts of the clamping mechanism. During adjustment, the conical part of the linear clamp and the second fixing ring are always in linear contact, and the adjusting guide rod rotates with it. According to the change of the length of the adjusting guide rod, the relative rotation of the upper and lower fixing rings can be finely adjusted, giving a continuous, slow and stable traction force to the bone fixed on the bone needle.

[0030] When two or more sets of adjustment mechanisms are used in combination, the lower end fixing ring can ensure that the lower end fixing ring can rotate relative to the upper end fixing ring under the premise that the relative position with the upper end fixing ring remains unchanged.

[0031] The whole mechanism can realize the relative adjustment of the two fixed rings at multiple angles and in multiple ranges, and has the advantages of simple structure, convenient adjustment method and high reliability.

[0032] In complex limb correction, there is no need to disassemble the external fixator, and the mechanism can be installed and fixed through the clamping action of the linear clamp. It is easy to install and use, flexible in application, and has high clinical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a schematic diagram of the rotation adjustment mechanism of the external fixator for limb correction.

[0034] Figure 2 It is a schematic diagram of the structure of the regulating component described in the present invention.

[0035] Figure 3 It is a partial enlarged view of the clamping mechanism described in the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0037] like Figure 1-3 As shown, the present invention provides a rotation adjustment mechanism of an external fixator for correction of limb deformity, comprising: a first fixing ring 100 , a threaded column 200 , a second fixing ring 300 , an adjustment guide rod 400 , a clamping mechanism, and a connecting piece 600 .

[0038] The first fixing ring 100 and the second fixing ring 300 are arranged opposite to each other and are respectively located at the upper and lower ends of the first fixing ring 100 and the second fixing ring 300. One end of the threaded column 200 passes through and is fixed on the first fixing ring 100. One end of the adjusting guide rod 400 is provided with a first through hole and the other end has an external thread. The threaded column 200 is arranged in the first through hole. The other end of the threaded column 200 passes through the first through hole and is positioned by two first positioning nuts 410. The clamping mechanism is detachably arranged on the second fixing ring 300 and can move circumferentially along the second fixing ring. The other end of the threaded column 200 is fixedly arranged on the top of the clamping mechanism. The lower part of the connecting piece 600 passes through the second fixing ring 300 and is fixed on the second fixing ring. The upper part of the connecting piece 600 is provided with a second through hole. The other end of the adjusting guide rod 400 has an external thread. The other end of the adjusting guide rod 400 passes through the second through hole and is positioned by two second positioning nuts 430a and 430b.

[0039] The first fixing ring 100 is a circular ring structure. A plurality of first circular holes are opened in the circumferential direction on the first fixing ring 100, and the plurality of first circular holes are arranged circumferentially at equal intervals on the first fixing ring 100. The first fixing ring 100 is arranged at the upper end of the rotation adjustment mechanism and is an upper fixing ring. The second fixing ring 300 is arranged opposite to the first fixing ring 100 and is located at the lower end of the rotation mechanism and is a lower fixing ring. A plurality of second circular holes are opened in the circumferential direction on the second fixing ring 300, and the plurality of second circular holes are arranged circumferentially at equal intervals on the second fixing ring 300.

[0040] The threaded column 200 has an external thread, and one end of the threaded column 200 passes through the first circular hole and is fixedly connected to the first fixing ring 100 through a nut. One end of the adjusting guide rod 400 is provided with a first through hole, and the other end has an external thread. The other end of the threaded column 200 passes through the first through hole and is positioned between the adjusting guide rod 400 through two first positioning bolts 410.

[0041] The clamping mechanism is arranged on the second fixing ring 300, and the other end of the threaded column 200 is fixed on the clamping mechanism. The clamping mechanism includes: a linear clamping piece 510, a fixing clamping piece 520 and two third positioning nuts 530. The linear clamping piece 510 is arranged on the second fixing ring 300. Conical parts 511 are symmetrically arranged at both ends of the bottom of the linear clamping piece 510, which are respectively in linear contact with both sides of the second fixing ring 300. Support columns 540 are also arranged on the two conical parts 511, so that the second fixing ring is arranged between the support columns 540. Third through holes are respectively opened at both ends of the fixing clamping piece 520. The support columns 540 have external threads. The two support columns 540 pass through the third through holes and are positioned by two third positioning nuts 530. The clamping mechanism is stably fixed on the second fixing ring 200 through the extrusion fit of the fixing clamping piece 520 and the third positioning nuts 530.

[0042] One end of the connecting piece 600 is fixedly arranged on the second fixing ring 300, and the other end of the connecting piece 600 is provided with a second through hole. The other end of the adjusting guide rod 400 has an external thread. After the other end of the adjusting guide rod 400 passes through the second through hole, it is positioned between the connecting piece 600 through two second positioning nuts 430a and 430b. The second positioning nut 430a is arranged on one side of the connecting piece 600, close to the threaded rod 200, and the second positioning nut 430b is arranged on the other side of the connecting piece 600.

[0043] A limit nut 420 is also provided on the adjusting guide rod 400 , which is matched and arranged at the external thread of the adjusting guide rod 400 and is located between the second positioning nut 430 and the first through hole, close to one side of the threaded rod 200 .

[0044] The connecting piece 600 also includes a clamping portion and an external threaded portion. The clamping portion is arranged in the middle of the connecting piece 600. The clamping portion is a cylindrical structure. The diameter of the clamping portion is larger than the diameter of the second circular hole. The external threaded portion is arranged at the lower part of the connecting piece 600. After the external threaded portion passes through the second circular hole 300, it is positioned by the fifth positioning bolt 610 so that the clamping portion is clamped on the second fixing ring 300.

[0045] During rotation adjustment, loosen the two third positioning nuts 530, disengage the fixing relationship between the fixing clip 530, the linear clamping piece 510 and the second fixing ring 300, loosen the second positioning nut 430a on one side of the adjusting guide rod 400 in the advancing direction, and continue to tighten the second positioning nut 440b on the other side, and drive the second fixing ring 300 to rotate relative to the first fixing ring 100 through the connecting piece 600. During the adjustment process, the adjusting guide rod 400 rotates along with it, and the relative rotation of the upper and lower fixing rings is fine-tuned according to the change in the length of the adjusting guide rod 400, so as to provide a continuous, slow and stable traction force to the bone fixed on the bone needle.

[0046] When two or more groups of mechanisms are used in combination, the rotation of the lower circular ring relative to the upper fixed ring can be achieved while ensuring that the relative positions of the two rings remain unchanged.

[0047] The whole mechanism can realize the relative adjustment of the two fixed rings at multiple angles and in multiple ranges, and has the advantages of simple structure, convenient adjustment method and high reliability.

[0048] In complex limb correction, there is no need to disassemble the external fixator, and the mechanism can be installed and fixed through the clamping action of the linear clamp. It is easy to install and use, flexible in application, and has high clinical application value.

[0049] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A rotation adjustment mechanism for an external fixator for correction of limb deformity, characterized in that: include: A first fixing ring, on which a plurality of first circular holes are circumferentially formed; A second fixing ring, which is arranged opposite to the first fixing ring, and the second fixing ring is provided with a plurality of second circular holes along the circumferential direction; A threaded column, one end of which passes through the first circular hole and is fixed on the first fixing ring through a nut; An adjusting guide rod, one end of which is provided with a first through hole; A clamping mechanism, which is detachably arranged on the second fixing ring and can move circumferentially along the second fixing ring, and the other end of the threaded column is fixed to the top of the clamping mechanism; The clamping mechanism comprises: A linear clamping member, which is arranged on the second fixing ring, support columns are symmetrically arranged at both ends of the linear clamping member, and the second fixing ring is arranged between the support columns; The two ends of the bottom of the linear clamp are symmetrically provided with tapered parts for clamping the second fixing ring and making linear contact; One end of the support column is fixedly disposed on the tapered portion; A fixing clip, which is arranged at the bottom of the second fixing ring, and third through holes are symmetrically opened at both ends of the fixing clip; Wherein, the support column has an external thread, and the support column is positioned by a third positioning nut after passing through the third through hole; A connecting piece, one end of which is provided with a second through hole, and the other end of which passes through the second circular hole and is fixedly arranged on the second fixing ring; Among them, the other end of the threaded column passes through the first through hole and is positioned by two first positioning nuts, and the other end of the adjusting guide rod passes through the second through hole and is positioned by two second positioning nuts, one of the second positioning nuts is set on one side of the connecting plate, and the other second positioning nut is set on the other side of the connecting plate.

2. The rotation adjustment mechanism of the external fixator for correction of limb deformity according to claim 1, characterized in that: The adjusting guide rod is also provided with a limiting nut, which is matched and arranged at the external thread of the adjusting guide rod, and is located between the second positioning nut and the first through hole, and close to the threaded column.

3. The rotation adjustment mechanism of the external fixator for correction of limb deformity according to claim 2, characterized in that: The connecting piece also includes: A pressing portion, which is arranged in the middle of the connecting piece, the pressing portion is a cylindrical structure, and the diameter of the pressing portion is larger than the diameter of the second circular hole; The external threaded portion is arranged at the lower part of the connecting piece.

4. The rotation adjustment mechanism of the external fixator for correction of limb deformity according to claim 3, characterized in that: The external threaded portion passes through the second circular hole and is fixed by a fourth nut, so that the pressing portion is pressed against the second fixing ring.

5. The rotation adjustment mechanism of the external fixator for correction of limb deformity according to claim 4, characterized in that: The plurality of first circular holes are arranged on the first fixing ring at equal intervals along the circumferential direction.

6. The rotation adjustment mechanism of the external fixator for correction of limb deformity according to claim 5, characterized in that: The plurality of second circular holes are arranged on the second fixing ring at equal intervals along the circumferential direction.

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