CN113274108A - External fixing support - Google Patents

Abstract

The invention provides an external fixing bracket which is used for osteotomy of a tubular bone, the external fixing bracket at least comprises two fixing needle groups, two groups of supporting rods and two oppositely arranged bases, each base comprises a body, a needle holding group and a rod fixing group, and each fixing needle group comprises at least two fixing needles which are used for connecting and fixing the external fixing bracket and the tubular bone. Each needle holding piece group comprises at least two needle holding pieces for clamping the fixing needle so that the fixing needle is fixed on the base. The support rod is positioned between the two bases and is used for connecting the two bases. The support rod comprises a first support rod and a second support rod. The fixed rod pieces in the fixed rod piece group are used for connecting and fixing the supporting rod and the base. The distance between the two bases is adjusted by adjusting the distance between the first supporting rod and the second supporting rod, and the bases drive the fixing needle group to prop open or compress the osteotomy line, so that the proximal joint end and the distal joint end of the tubular bone have an included angle, and the correction of the limb force line is realized.

Description

External fixing support

Technical Field

The invention relates to the technical field of medical instruments, in particular to an external fixing support.

Background

With the age-old age of China, the bone joint diseases increase year by year, and particularly, the pathological changes of a patellofemoral joint and an inner tibiofemoral joint are more. The varus and valgus deformity of knee joint osteoarthritis can cause abnormal distribution of joint load stress, such as the varus deformity of the knee joint, so that the stress concentration on the inner side of the knee joint is caused, and the degeneration of the joint on the inner side is accelerated. When the knee joint is everted and deformed, the stress on the outer side of the joint is concentrated, so that the degeneration of the outer joint is accelerated.

Among the treatment methods of osteoarticular diseases, the rate of artificial joint replacement is decreasing year by year, and joint maintenance treatment is increasingly preferred. For example, more than 40% of patients with knee osteoarthritis can be treated with High Tibial Osteotomy (HTO) to achieve satisfactory clinical efficacy.

The high tibial osteotomy is used for treating a tubular bone lesion, such as arthritis of a knee joint bone, and can be used for treating the tubular bone lesion through a high tibial osteotomy. Arthritis of the knee bones can often be accompanied by varus or valgus deformity. In knee varus, stress is concentrated in the medial portion of the knee and accelerates the progression of degenerative changes that occur inside the knee. Conversely, when the knee joint is deformed in valgus position, these changes occur in the lateral portion of the knee joint. The primary purpose of osteotomies is to improve knee joint function by correcting the knee joint axis and increasing the stability of the joint. However, the high tibial osteotomy has the problems that the operative wound is large, and the accurate control of the force line correction is difficult to achieve.

Disclosure of Invention

The invention aims to provide an external fixing bracket which can more accurately correct limb force lines in a tubular osteotomy and avoid internal fixing.

In order to achieve the above object, the present invention provides an external fixation bracket for osteotomy of tubular bone, the external fixation bracket comprising at least two fixation needle sets, at least two sets of support rods and two oppositely disposed bases, one fixation needle set corresponding to one base, and two sets of support rods both located between the two bases to connect the two bases;

each base comprises a body, a needle holding group and a rod fixing group, each needle fixing group comprises at least two fixing needles, each needle holding group comprises at least two needle holding pieces, the fixing needles correspond to the needle holding pieces, each rod fixing group comprises at least two rod fixing pieces, and the rod fixing pieces are arranged at the connecting positions of the body and the supporting rods to realize the connection and the fixation of the body and the supporting rods;

the fixing needle passes through the corresponding body and extends into the tubular bone, and the needle holding piece extends into the corresponding body to clamp the corresponding fixing needle;

each group of the supporting rods corresponds to the rod fixing piece, two ends of each supporting rod are connected with the body through the corresponding rod fixing pieces respectively, and the supporting rods are used for adjusting the distance between the two bases.

Optionally, each set of the support rods includes a first support rod and a second support rod, the first support rod is a hollow tube with an internal thread, the second support rod is a first screw rod, the second support rod is screwed into the first support rod to form the support rod, and the first support rod and/or the second support rod are/is rotated to achieve the stretching of the support rod.

Optionally, each group of support rods includes a first support rod, a second support rod and a hollow sleeve, the first support rod and the second support rod are second screws with the same length and the same diameter, two ends of the hollow sleeve are provided with reverse internal threads, the first support rod and the second support rod are respectively screwed into two ends of the hollow sleeve to form the support rods, and the hollow sleeve is rotated to achieve the extension and retraction of the support rods.

Optionally, each group of the support rods includes a first support rod, a second support rod and a stop piece, the first support rod and the second support rod are both semicircular rods with the same diameter, the first support rod has a slide rail, the second support rod has a slide groove, the first support rod is embedded into the second support rod to form the support rod, and the stop piece is used for fixing the first support rod and the second support rod and sliding the first support rod and/or the second support rod to achieve the extension and retraction of the support rod.

Optionally, the two ends of the supporting rod are both provided with a ball head, so that the fixing rod piece is rotatably connected with the supporting rod, and the fixing rod piece is further used for fixing the ball head, so that the supporting rod is fixedly connected with the fixing rod piece.

Optionally, the rod fixing member includes:

the surface, which is fixed on the body and faces the supporting rod, of the fixed rod structure is a concave spherical surface, and the ball head is matched with the spherical surface;

the locking piece is nested outside the ball head and used for fixing the ball head.

Optionally, the base further includes reinforcement sets, each reinforcement set includes at least two reinforcements, one reinforcement corresponds to one support rod, each reinforcement extends out of the body after penetrating through the body, a portion of the reinforcement extending out of the body is the rod fixing structure, a surface of the rod fixing structure facing the support rod is a concave spherical surface, and the ball head is matched with the spherical surface;

the locking piece is nested outside the ball head and used for fixing the ball head.

Optionally, the fixed rod structure is cylindrical, threads are arranged on the outer wall of the fixed rod structure, the locking piece is a fastening nut, and the fixed rod structure is in threaded connection with the fastening nut.

Optionally, the reinforcement set further includes a first threaded hole penetrating through the body, the reinforcement is a first bolt, and the first bolt penetrates through the first threaded hole and protrudes out of the body.

Optionally, the needle holding piece set further includes a second threaded hole formed in the body, the needle holding piece is a second bolt, and the second bolt penetrates through the second threaded hole to extend into the corresponding body to clamp the corresponding fixing needle.

The external fixation stent of the present invention is used for osteotomy of tubular bones. And the fixing needle of the fixing needle group is used for fixedly connecting the outer fixing bracket with the tubular bone. The needle holding piece of the needle holding piece group is used for clamping the fixing needle, so that the base clamps the fixing needle. The supporting rod is positioned between the two bases and is used for connecting the two bases. The supporting rods comprise a first supporting rod and a second supporting rod along the Z axis, and the rod fixing pieces of the rod fixing piece group are used for connecting the supporting rods with the base. After the first supporting rod and the second supporting rod are in threaded connection, the distance between the two bases can be adjusted by rotating the first supporting rod and/or the second supporting rod. Therefore, the base drives the fixing needle group to open or compress the osteotomy line, so that the proximal joint end and the distal joint end of the tubular bone form an included angle, and limb force line correction is realized.

In addition, one end of the support rod connected with the rod fixing piece is provided with a ball head, and the ball head is rotatably connected with the corresponding rod fixing piece, so that the direction and the angle of the support rod and the base can be changed. The outer fixing bracket of the invention has larger adjustable space.

In addition, the fixed rod structure is cylindrical, threads are arranged on the outer wall of the fixed rod structure, the locking piece is a fastening nut, and the fixed rod structure is in threaded connection with the fastening nut. Therefore, the ball head can be fastened or loosened by rotating the fastening nut, and the support rod and the base are further fixed. Make the user can be more convenient fixed the bracing piece with the base is favorable to more accurate correction limbs power line.

Drawings

FIG. 1 is a schematic view of the external fixation frame and the tibia according to a first embodiment of the present invention;

FIG. 2 is a schematic view of an external fixation frame according to a first embodiment of the present invention;

FIG. 3 is an exploded view of an external fixation frame according to one embodiment of the present invention;

FIG. 4 is a schematic view of a base according to a second embodiment of the present invention;

FIG. 5 is an exploded view of a base according to a second embodiment of the present invention;

fig. 6 is an exploded view of a support rod according to a third embodiment of the present invention;

FIG. 7 is a schematic view of a support bar according to a fourth embodiment of the present invention;

FIG. 8 is a schematic view of a first support bar according to a fourth embodiment of the present invention;

FIG. 9 is a schematic view of a first support bar according to a fourth embodiment of the present invention;

FIG. 10 is a schematic view of a second support bar according to a fourth embodiment of the present invention; wherein the reference numbers are as follows:

100-fixing the needle; 100A-a first set of fixed needles; 100B-a second set of fixed needles;

200-a support bar; 210-a first support bar; 211-a slide rail; 220-a second support bar; 221-a chute; 230-ball head; 240-hollow cannula; 250-a stop;

300A-a first base; 300B-a second base; 310-needle holding group; 311-a second threaded hole; 312-a needle holder; 320-a rod fixing member; 321-a rod fixing structure; 321A-spherical surface; 321B-the outer wall of the rod-fixing structure; 322-a locking member; 330-reinforcement group; 331-a reinforcement; 331A-through hole; 332-a first threaded hole;

b-tubular bone; b01-osteotomy line; b02-proximal joint end; b03-distal joint end; b04-fixation holes;

L-Limb line of force.

Detailed Description

The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

Example one

Tibial high osteotomy (HTO) is an important technique for treating knee osteoarthritis. Weight bearing loads are transferred from the osteoarthritic to the relatively unaffected parts by the tibial high osteotomy limb line of force. The osteotomy is also used to resolve congenital and traumatic deformities of the limbs, such as the O-legs, etc.

In this embodiment, taking the treatment of knee osteoarthritis as an example, generally, the HTO adopts a medial open osteotomy, that is, a cut is made at the proximal joint part of the tibia to form an osteotomy line, two sides of the osteotomy line are divided into a proximal joint end and a distal joint end, and the proximal joint end and the distal joint end are spread to form a wedge-shaped opening, so as to realize the force line correction. To avoid the change of the opening, a support spacer, such as a wedge-shaped osteotomy block, is added. Internal or external fixation is required to avoid displacement of the osteotomy block of the osteotomy portion, occurrence of fracture, and change of force line.

While the medial open wedge osteotomy provides great benefit to the patient, the surgical trauma is large, incisions of more than 10cm and large areas of subcutaneous tissue dissection increase the chances of bleeding, infection and tissue necrosis. In addition, internal fixation is required to be performed in order to increase the postoperative stability, and finally, the internal fixation piece needs to be taken out through a secondary operation, so that not only are the operation trauma and the cost increased, but also the accurate control of the force line correction has higher difficulty, and the clinical curative effect is possibly influenced.

Based on this, this embodiment provides an external fixation support, cooperates the absorbable wedge implant, can greatly reduce HTO's operation wound, can more accurate correction limbs line of force.

Fig. 1 is a schematic view of a positional relationship between an external fixation frame and a tibia in this embodiment, and fig. 2 is a schematic view of the external fixation frame in this embodiment.

As shown in fig. 1 and 2, an external fixation bracket is used for osteotomy of a tubular bone B. The outer fixed support comprises at least two fixed needle groups, at least two groups of supporting rods 200 and two oppositely arranged bases, wherein one fixed needle group corresponds to one base, and each fixed needle group at least comprises two fixed needles 100. The two support rods 200 are located between the two bases to connect the two bases.

A tubular bone B, such as a tibia, comprises a osteotomy line B01, a proximal joint end B02 and a distal joint end B03 of the tubular bone B are distributed on two sides of the osteotomy line B01, a plurality of fixing holes B04 are respectively formed on the proximal joint end B02 and the distal joint end B03 of the tubular bone B, fixing needles 100 in a fixing needle group extend into the fixing holes B04 and are fixedly connected with a proximal joint end B02 and a distal joint end B03 of the tubular bone B, an outer fixing bracket is used for clamping the fixing needles 100 and adjusting the relative positions of the fixing needles 100 to open the osteotomy line B01, after the osteotomy line B01 is opened, openings are formed on the proximal joint end B02 and the distal joint end B03, the openings have an included angle, the outer fixing bracket further adjusts the relative positions of the fixing needles 100 to change the angle of the tubular bone B, so that the proximal joint end B86525 and the distal joint end B53936 of the tubular bone B are located at a desired position 03, so that the limb line of force L is corrected.

With continued reference to fig. 1 and 2, in the present embodiment, the outer fixing bracket includes two fixing needle groups, a first fixing needle group 100A and a second fixing needle group 100B. Wherein the first fixing needle group 100A corresponds to the proximal joint end B02 of the tubular bone B, and the second fixing needle group 100B corresponds to the distal joint end B03 of the tubular bone B. Wherein the fixation needle 100 extends along the X-axis into a fixation hole B04 in the tubular bone B. In this way, the fixing pins 100 of the fixing pin set are fixed to the tubular bone B, and the base is fixed to the proximal joint end B02 and the distal joint end B03 of the tubular bone B by clamping the fixing pins 100. It should be noted that in one embodiment of this embodiment, the number of the fixing pins 100 is two, one of which is fixed to the proximal joint end B02 of the tubular bone B and the other of which is fixed to the distal joint end B03 of the tubular bone B. In another embodiment of this embodiment, the number of the fixing pins 100 is four, two of which are fixed to the proximal joint end B02 of the tubular bone B and the other two of which are fixed to the distal joint end B03 of the tubular bone B. It should be understood that the number of the fixing pins may be five, six or seven, which are not listed here.

The fixation needle 100 needs to be drilled into the tubular bone B to a certain length and cannot reach the joint cavity. Generally, the fixing needle 100 is implanted by drilling a fixing hole B04 on the tubular bone B by a user, knocking the fixing needle 100 to make the fixing needle 100 enter the fixing hole B04, and the fixing needle 100 is in interference fit with the fixing hole B04 to realize a fixed connection.

Optionally, the fixation needle 100 is at least partially threaded. In one embodiment of the present embodiment, the fixing pin 100 has threads distributed on the entire outer circumference thereof. In another embodiment of this embodiment, the portion of the fixation needle 100 that enters the tubular bone B is threaded.

In specific implementation, the portion of the fixing pin 100 extending into the tubular bone B is a tip, and the tip portion of the fixing pin 100 is provided with a thread. In this way, when the fixing pin 100 is fixedly coupled to the tubular bone B, the user rotates the fixing pin 100 to drive the fixing pin 100 to be inserted into the fixing hole B04 of the tubular bone B. Compared with the fixing needle 100 without threads, when the fixing needle 100 with threads is used, a user does not need to knock the fixing needle 100 into the fixing hole B04, so that the working strength of the user can be reduced, and secondary injury to the tubular bone B caused by knocking the fixing needle 100 can be avoided.

With continued reference to fig. 1 and 2, the outer fixing bracket further includes two oppositely disposed first and second bases 300A and 300B. In this embodiment, the first fixed needle group 100A corresponds to the first base 300A, and the second fixed needle group 100B corresponds to the second base 300B. The fixing pins 100 of the first fixing pin group 100A pass through the first base 300A and extend into the tubular bone B, and the first base 300A clamps the first fixing pin group 100A to fixedly connect the first base 300A with the proximal joint end B02 of the tubular bone B. The fixing needles 100 of the second fixing needle group 100B pass through the second base 300B and extend into the tubular bone B, and the second base 300B clamps the second fixing needle group 100B to fixedly connect the second base 300B with the distal joint end B03 of the tubular bone B. As such, the relative position between the fixing needle 100 can be adjusted by adjusting the relative position between the first base 300A and the second base 300B so that the proximal joint end B02 and the distal joint end B03 in the tubular bone B are located at a desired position.

In the present embodiment, the fixing needles 100 of the first fixing needle group 100A pass through the first base 300A along the X-axis and extend into the tubular bone B, and the fixing needles 100 of the second fixing needle group 100B pass through the second base 300B along the X-axis and extend into the tubular bone B. It should be appreciated that the orientation of the fixation pins 100 may also be non-uniform.

With continued reference to fig. 1 and 2, each base includes a body (not numbered) and a needle holder set 310, each needle holder set 310 includes at least two needle holders 312, the fixing needle 100 corresponds to the needle holders 312, and the needle holders 312 extend into the corresponding base body along the Y-axis to clamp the corresponding fixing needle 100.

Further, the needle holder set 310 further includes a second screw hole 311, and the second screw hole 311 is opened on the body of the base along the Y axis. The needle holding member 312 is a second bolt passing through the second threaded hole 311 to extend into the bodies of the first and second bases 300A and 300B to clamp the corresponding fixing needle 100.

In this embodiment, each of the fixing pins 100 in the first fixing pin group 100A corresponds to one of the pin holding members 312 in the first base 300A, and a second threaded hole 311 is formed along the Y axis at a position of the first base 300A corresponding to the fixing pin 100. The needle holder 312 passes through the second threaded hole 311 and abuts against the fixing needle 100 to clamp the fixing needle 100.

Fig. 3 is an exploded view of the outer fixing bracket in this embodiment. As shown in fig. 1 to 3, the external fixing bracket further includes at least two sets of support rods 200, and each base further includes a set of fixing rods. Wherein, two said bracing pieces 200 are located between two said bases, in order to connect two said bases. The rod fixing group on the base comprises at least two rod fixing pieces 320, and the rod fixing pieces 320 are arranged at the joint of the body of the base and the supporting rod 200 to realize the connection and fixation of the body of the base and the supporting rod 200.

Furthermore, each group of supporting rods 200 corresponds to a rod fixing member 320, two ends of each supporting rod 200 are respectively connected with the body of the base through the corresponding rod fixing members 320, and the supporting rods 200 are used for adjusting the distance between the two bases.

Optionally, each set of support rods 200 includes two first support rods 210 and two second support rods 220 along the Z axis, the fixing rod 320 corresponds to the support rods 200, after the first support rods 210 and the second support rods 220 are connected by threads, two ends of the fixing rod 320 are connected to the body of the base through the corresponding fixing rod, and the first support rods 210 or the second support rods 220 are rotated to adjust the distance between the bases. It should be appreciated that the first support bar 210 and the second support bar 220 may also be rotated simultaneously when adjusting the spacing between the two bases.

Optionally, the first support bar 210 and the second support bar 220 are nested to achieve a threaded connection. In a specific embodiment, the first support rod 210 is a hollow tube with internal threads, i.e., a sleeve rod, and the second support rod 220 is a screw rod. Screwing the first support bar 210 into the second support bar 220 to form the support bar 200, and rotating the first support bar 210 and/or the second support bar 220 to achieve the extension and contraction of the support bar 200.

Optionally, one end of the support rod 200 connected to the rod fixing member 320 is provided with a ball head 230, and the support rod 200 is rotatably or fixedly connected to the corresponding rod fixing member 320 through the ball head 230. Further, the rod fixing member 320 includes a rod fixing structure 321 and a locking member 322, the rod fixing structure 321 is fixed on one surface of the base body facing the support rod 200, one surface of the rod fixing structure 321 facing the support rod 200 is an inwardly recessed spherical surface 321A, and the ball head 230 is matched with the spherical surface 321A. The locking member 322 is nested outside the ball head 230 and used for fastening or loosening the ball head 230 so as to enable the support rod 200 to be rotatably or fixedly connected with the rod fixing member 320.

In this embodiment, the rod fixing structure 321 is integrated with the body of the base. The rod fixing structure 321 may be integrally formed with the body of the base, or the rod fixing structure 321 may be welded and fixed with the body of the base after being separately processed.

Further, gu the pole structure 321 is cylindricly, just the outer wall 321B of pole structure 321 is provided with the screw thread, retaining member 322 is the fastening nut, gu the pole structure 321 through outer wall 321B with fastening nut threaded connection. In this way, the ball head 230 can be fastened or loosened by rotating the fastening nut, so that the support rod 200 is rotatably or fixedly connected with the rod fixing member 320.

In specific implementation, the ball head 230 of the supporting rod 200 and the spherical surface 321A of the rod fixing structure 321 can rotate in multiple directions and angles. Thereby, a relative position between the support bar 200 and the base has a larger adjustment space. There is more choice in the relative position between the first base 300A and the second base 300B. When the relative position between the first base 300A and the second base 300B is adjusted to a desired position, the ball 230 is fastened by rotating the locking member 322, so that the support rod 200 is fixedly connected with the first base 300A and the second base 300B, and the relative position between the bases is maintained at the desired position. The ball head 230 is fastened by the locking member 322 for fixing, so that the fixing support rod 200 and the base are convenient for a user.

Therefore, the outer fixing bracket of the invention has a larger adjusting space, and can fix the supporting rod 200 and the base more conveniently. Therefore, the included angle between the proximal joint end B02 and the distal joint end B03 can be adjusted more accurately by the user, and the limb force line L can be corrected more accurately.

Example two

The same parts of the external fixing bracket provided in this embodiment as those in the first embodiment will not be described again, and only different points will be described below.

Fig. 4 is a schematic view of a base in an embodiment of the present invention, fig. 5 is an exploded schematic view of the base in the embodiment of the present invention, and fig. 6 is a schematic view of an external fixing bracket in the embodiment of the present invention. As shown in fig. 4 to 6, the difference between the present embodiment and the first embodiment is: the base further comprises reinforcement groups 330, each reinforcement group 330 comprises at least two reinforcements 331, one reinforcement 331 corresponds to one support rod 200, each reinforcement 331 extends out of a body (not numbered in the figure) of the base after penetrating through the body along a Z-axis, a part of the reinforcement 331 extending out of the body of the base is a rod fixing structure 321, one surface of the rod fixing structure 321 facing the support rod 200 is an inwardly concave spherical surface 321A, and the ball head 230 is matched with the spherical surface 321A; a retaining member 322 is nested outside the ball head 230 for fastening or releasing the ball head 230.

Further, the reinforcement set 330 further includes a first threaded hole 332 penetrating through the body along the Z-axis, and the reinforcement 331 is a first bolt extending out of the body through the first threaded hole 332. The part of the first bolt extending out of the body of the base is a rod fixing structure 321. That is, in the present embodiment, the rod fixing structure 321 is not integrated with the body of the base, and the rod fixing structure 321 is a part of the reinforcing member 331.

Further, the stiffness of the stiffener is greater than the stiffness of the body of the base. It will be appreciated that in this embodiment the first bolt is harder than the body of the base.

Further, the fixing pin 100 passes through the body of the base and the reinforcement 331 along the X-axis and extends into the tubular bone B.

It will be appreciated that the addition of the reinforcement 331 in the body of the base is due to the fact that in practice, the body of the base is typically made of stainless steel. Due to the low hardness of stainless steel, the position of the fixing pin 100 passing through the base may be deformed when the limb line of force L is adjusted. This results in the base not having the effect of gripping the retaining pin 100. Based on this, the inventor adds the stiffness of the reinforcing member 331 for elevating the position where the fixing pin 100 passes through the base body. Therefore, the base can better clamp the fixing needle.

In specific implementation, the body of the base is provided with a first threaded hole 332 along the Z axis, and the first bolt has a length long enough to extend out of the body of the base through the first threaded hole 332. The portion of the first bolt extending out of the body of the base is threadedly coupled to a locking member 322. For fastening or loosening the ball head 230 of the support bar 200 so that the support bar 200 is rotatably or fixedly connected to the first bolt. A through hole 331A for the fixing needle 100 to pass through is formed in the shaft of the first bolt, and when the first bolt is fixed on the base, the through hole 331A is just located in the X-axis direction.

EXAMPLE III

The same portions of the external fixation bracket provided in this embodiment as those of the first and second embodiments will not be described here, and only different points will be described below.

Fig. 7 is an exploded view of the support rod according to the embodiment of the present invention. As shown in fig. 7, the supporting rod 200 further includes a hollow sleeve 240, opposite internal threads are disposed at two ends of the hollow sleeve 240, the first supporting rod 210 and the second supporting rod 220 are both screws, and the first supporting rod 210 and the second supporting rod 220 are screws with the same diameter and the same length. The first support rod 210 and the second support rod 220 are respectively screwed into both ends of the hollow sleeve 240 to form the support rod 200, and the hollow sleeve 240 is rotated to achieve the extension and contraction of the support rod 200. Specifically, since the opposite threads are provided at both ends of the inner wall of the hollow sleeve 240, the support rod 200 may be extended or shortened by rotating the hollow sleeve 240 to adjust the relative position between the first base 300A and the second base 300B. Relative to the supporting rod 200 of the first embodiment, the supporting rod 200 of the first embodiment can be used for adjusting the relative position of the base in two directions by rotating the hollow sleeve 240. Preferably, the outer circumference of the hollow sleeve 240 is configured to match a wrench. Thus, the user can adjust the relative positions of the first base 300A and the second base 300B conveniently by using a wrench.

Example four

The same portions of the external fixing bracket provided in this embodiment as those of the first, second and third embodiments will not be described here, and only different points will be described below.

Fig. 8 is an exploded view of a support rod according to an embodiment of the present invention, fig. 9 is a view illustrating a first support rod according to a fourth embodiment of the present invention, and fig. 10 is a view illustrating a second support rod according to the fourth embodiment of the present invention. As shown in figures 8 to 10 of the drawings,

each of the support bars 200 includes a first support bar 210, a second support bar 220, and a stopper 250, wherein the first support bar 210 and the second support bar 220 are both semicircular bars with the same diameter, the first support bar 210 has a slide rail 211, the second support bar 220 has a slide groove 221, the first support bar 210 is fitted into the second support bar 220 to form the support bar 200, and the stopper 250 is used for fixing the first support bar 210 and the second support bar 220, and sliding the first support bar 210 and the second support bar 220 to achieve the extension and retraction of the support bar 200. It should be appreciated that the first support bar 210 or the second support bar 220 can also be slid to achieve the extension and contraction of the support bar 200.

The bracing piece 200 all includes two first bracing piece 210 and the second bracing piece 220 along the Z axle, gu the member 320 with the bracing piece 200 is corresponding, first bracing piece 210 and second bracing piece 220 sliding connection back, both ends are respectively through corresponding gu the member 320 with this body coupling of base slides first bracing piece 210 or second bracing piece 220 is in order to adjust two interval between the base.

Further, a slide rail 211 is arranged on the first support rod 210, a slide groove 221 is arranged on the second support rod 220, the first support rod 210 and the second support rod 220 are connected in a sliding manner through the slide rail 211 and the slide groove 221, and a stop piece 250 is further arranged on the first support rod 210 or the second support rod 220 and used for fixing the first support rod 210 and the second support rod 220. It should be appreciated that the stopper 250 may also be provided on both the first support bar 210 and the second support bar 220. The two stoppers 250 are used for stopping the first support bar 210 and the second support bar 220 at the same time, and have a better stopping effect.

More preferably, the slide rail 211 is a trapezoidal slide rail, and the slide groove 221 is a trapezoidal slide groove, it should be understood that the size of the trapezoidal slide rail matches the shape of the trapezoidal slide groove, so that the trapezoidal slide rail can be embedded into the trapezoidal slide groove, and the trapezoidal slide rail and the trapezoidal slide groove can be tightly matched, thereby preventing the first support rod 210 and the second support rod 220 from shaking, and meanwhile, enabling the first support rod 210 and the second support rod 220 to normally slide. In addition, in the supporting rod 200 of the present embodiment, the first supporting rod 210 and the second supporting rod 220 have relatively equal mechanical strength, which is beneficial to the supporting strength of the external fixing bracket.

In summary, an embodiment of the present invention provides an external fixation bracket for osteotomy of a tubular bone, the external fixation bracket includes two fixation needle sets, two sets of support rods, and two bases disposed oppositely, one fixation needle set corresponds to one base, and the two support rods are disposed between the two bases to connect the two bases. Each base comprises a body, a needle holding group and a rod fixing group, each needle fixing group comprises at least two fixing needles, each needle holding group comprises at least two needle holding pieces, the fixing needles correspond to the needle holding pieces, each rod fixing group comprises at least two rod fixing pieces, and the rod fixing pieces are arranged at the joints of the bodies and the supporting rods so as to fix the bodies and the supporting rods. The fixing needles penetrate through the corresponding bodies along an X axis and extend into the tubular bones, and the needle holding pieces extend into the corresponding bodies along a Y axis to clamp the corresponding fixing needles. Every the bracing piece all includes two first bracing pieces and the second bracing piece along the Z axle, gu the member with the bracing piece is corresponding, behind first bracing piece and the second bracing piece threaded connection, both ends are respectively through corresponding gu the member with this body coupling rotates first bracing piece and/or the second bracing piece can be adjusted two interval between the base. Therefore, the base drives the fixing needle group to prop open the osteotomy line, so that the proximal joint end and the distal joint end of the tubular bone form an included angle, and the correction of the limb force line is realized. In addition, one end of the supporting rod connected with the rod fixing piece is provided with a ball head, and the supporting rod is rotatably connected with the corresponding rod fixing piece through the ball head. This enables multi-directional, multi-angle rotation between the support bar and the base. The outer fixing bracket of the invention has larger adjustable space. In addition, the fixed rod structure is cylindrical, threads are arranged on the outer wall of the fixed rod structure, the locking piece is a fastening nut, and the fixed rod structure is in threaded connection with the fastening nut. Therefore, the ball head can be fastened or loosened by rotating the fastening nut, and the support rod and the base are further fixed. The supporting rod and the base can be fixed more conveniently by a user, and more accurate limb force line correction is facilitated.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An external fixing bracket for osteotomy of tubular bones is characterized by comprising at least two fixing needle groups, at least two groups of supporting rods and two oppositely arranged bases, wherein one fixing needle group corresponds to one base, and the two groups of supporting rods are positioned between the two bases so as to connect the two bases;

each base comprises a body, a needle holding group and a rod fixing group, each needle fixing group comprises at least two fixing needles, each needle holding group comprises at least two needle holding pieces, the fixing needles correspond to the needle holding pieces, each rod fixing group comprises at least two rod fixing pieces, and the rod fixing pieces are arranged at the connecting positions of the body and the supporting rods to realize the connection and the fixation of the body and the supporting rods;

the fixing needle passes through the corresponding body and extends into the tubular bone, and the needle holding piece extends into the corresponding body to clamp the corresponding fixing needle;

each group of the supporting rods corresponds to the rod fixing piece, two ends of each supporting rod are connected with the body through the corresponding rod fixing pieces respectively, and the supporting rods are used for adjusting the distance between the two bases.

2. The external fixation frame as claimed in claim 1, wherein each set of the support bars comprises a first support bar and a second support bar, the first support bar is a hollow tube with internal threads, the second support bar is a first screw, the second support bar is screwed into the first support bar to form the support bar, and the first support bar and/or the second support bar are/is rotated to achieve the extension and contraction of the support bars.

3. The external fixation bracket of claim 1, wherein each set of the support rods comprises a first support rod, a second support rod and a hollow sleeve, the first support rod and the second support rod are second screws with the same length and the same diameter, two ends of the hollow sleeve are provided with reverse internal threads, the first support rod and the second support rod are respectively screwed into two ends of the hollow sleeve to form the support rods, and the hollow sleeve is rotated to achieve the extension and contraction of the support rods.

4. The external fixation bracket of claim 1, wherein each set of support bars comprises a first support bar, a second support bar, and a stop member, wherein the first support bar and the second support bar are semi-circular bars with the same diameter, the first support bar has a slide rail, the second support bar has a slide groove, the first support bar is wedged into the second support bar to form the support bars, and the stop member is used for fixing the first support bar and the second support bar and sliding the first support bar and/or the second support bar to achieve the extension and retraction of the support bars.

5. The external fixation bracket of claim 1, wherein the two ends of the support rod are provided with bulbs, so that the rod fixing member is rotatably connected with the support rod, and the rod fixing member is further used for fixing the bulbs, so that the support rod is fixedly connected with the rod fixing member.

6. The external fixation bracket of claim 5 wherein the rod securing member comprises:

the surface, which is fixed on the body and faces the supporting rod, of the fixed rod structure is a concave spherical surface, and the ball head is matched with the spherical surface;

the locking piece is nested outside the ball head and used for fixing the ball head.

7. The external fixation bracket of claim 5, wherein said base further comprises a plurality of reinforcement sets, each of said plurality of reinforcement sets comprising at least two reinforcement members, one of said reinforcement members corresponding to one of said support rods, each of said reinforcement members extending through said body and out of said body, said reinforcement members extending out of said body being in the form of said rod-securing structure, a surface of said rod-securing structure facing said support rods being a concave spherical surface, said ball head being matched to said spherical surface;

the locking piece is nested outside the ball head and used for fixing the ball head.

8. The external fixation bracket of claim 6 or 7, wherein the rod fixing structure is cylindrical and has threads on an outer wall, the locking member is a fastening nut, and the rod fixing structure is in threaded connection with the fastening nut.

9. The external fixation bracket of claim 1, wherein the set of reinforcement members further comprises a first threaded hole extending through the body, and wherein the reinforcement member is a first bolt extending through the first threaded hole and out of the body.

10. The external fixation bracket of claim 1, wherein the needle holder set further comprises a second threaded hole formed in the body, and the needle holder is a second bolt passing through the second threaded hole to extend into the corresponding body to clamp the corresponding fixation needle.

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