CN113040839A

CN113040839A - Expansion type vertebra distraction device

Info

Publication number: CN113040839A
Application number: CN201911373985.1A
Authority: CN
Inventors: 陈立生; 赵哲扬; 高立寰
Original assignee: Baili Technology Co ltd
Current assignee: Baili Technology Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29

Abstract

The invention provides an expansion type vertebra distraction device, which comprises: an axis having a front end and a rear end; the unfolding part is sleeved outside the shaft center and comprises a blade part, a fixing part and a connecting part, wherein the blade part is provided with a plurality of blades, and the thickness of each blade gradually becomes thicker from the front end to the rear end; the fixing part is used for fixing the relative position of the unfolding part and the axis in the axial direction of the axis, but allows the axis to rotate relative to the unfolding part in the fixing part in the radial direction of the axis; the connecting part is used for connecting the lobe part and the fixing part; a support ring, which is sleeved outside the shaft center and is located between the shaft center and the unfolding part from the radial direction of the shaft center; when the expanding ring moves towards the rear end relative to the expanding part, the blades are expanded, and the effect of expanding the vertebra is achieved.

Description

Expansion type vertebra distraction device

Technical Field

The invention relates to an expansion type vertebra expansion device, in particular to a vertebra expansion device which can be expanded outwards after being implanted into a human body so as to expand vertebrae to achieve the effect of reduction treatment.

Background

When the vertebra (such as cervical vertebra, thoracic vertebra, lumbar vertebra) of the human body is subjected to Compression fracture (Compression fracture) or collapses due to poor bone density, a vertebra distraction device is required to be implanted into the vertebra of the human body to distract the vertebra body upwards and downwards so as to achieve the effect of reduction treatment. For example, see US 7,846,206B2, US 9,414,933B2, and TW I589266 for prior art vertebral distraction devices.

The invention adopts an expansion type mechanical structure different from the prior art, can omit parts in the prior art, and is easy to manufacture and assemble.

Disclosure of Invention

In one aspect, the present invention provides a deployable vertebral distraction device comprising: an axis having a front end and a rear end; the unfolding part is sleeved outside the shaft center and comprises a blade part, a fixing part and a connecting part, wherein the blade part is provided with a plurality of blades, and the thickness of each blade gradually becomes thicker from the front end to the rear end; the fixing part is used for fixing the relative position of the unfolding part and the axis in the axial direction of the axis, but allows the axis to rotate relative to the unfolding part in the fixing part in the radial direction of the axis; the connecting part is used for connecting the lobe part and the fixing part; a support ring, which is sleeved outside the shaft center and is located between the shaft center and the unfolding part from the radial direction of the shaft center; when the expanding ring moves towards the rear end relative to the expanding part, the blades are expanded, and the effect of expanding the vertebra is achieved.

In a preferred embodiment, the periphery of the body of the shaft center is provided with threads, and the interior of the expanding ring is provided with corresponding threads.

In a preferred embodiment, the rear end of the shaft is an operating end, and can be rotated by a corresponding tool, so that the shaft rotates relative to the unfolding portion inside the fixing portion.

In a preferred embodiment, the operative end is hexagonal.

In a preferred embodiment, the spreader ring includes at least one protrusion for extending into a gap created after the blades are spread, and abutting against one side of at least one blade.

In a preferred embodiment, the periphery of the shaft includes a flange, and the fixing portion is disposed outside the flange.

In a preferred embodiment, the expanding vertebral distraction device further comprises a nut that is bolted to the front end of the shaft.

In a preferred embodiment, the shaft is hollow and has inlet and outlet openings.

In a preferred embodiment, the axial core is provided with outflow openings in the radial direction.

In a preferred embodiment, each blade has a width D, and the connecting portion connects to each blade has a width D, wherein D < (1/2) D.

The purpose, technical content, features and effects of the present invention will be more readily understood through the following detailed description of specific embodiments.

Drawings

Fig. 1 illustrates a distracted state of the expanding vertebral distractor device according to one embodiment of the invention.

Fig. 2 shows an exploded view of the embodiment of fig. 1.

Fig. 3 shows a folded state of the embodiment of fig. 1.

Fig. 4 illustrates a distracted state of the expanding vertebral distractor device according to another embodiment of the invention.

Fig. 5 shows an exploded view of the embodiment of fig. 4.

Description of the symbols in the drawings

100,200 expansion type vertebra distraction device

101 axle center

101A operation terminal

101B flange

101C opening

102 expansion part

102A lobe part

102a1 thickness

102B fixed part

102C connection part

103 expanding ring

103A projection

109 nut

Detailed Description

The drawings in the present invention are schematic and are intended to show the functions of the respective structural parts and the relationship therebetween, and the shape, thickness and width of the structural parts can be adjusted and changed in practice.

Referring to fig. 1-3, one embodiment of the expanding vertebral distraction device 100 of the invention is shown. Fig. 1 shows the device of the present invention in an expanded state, fig. 2 shows the device of the present invention in an exploded view, and fig. 3 shows the device of the present invention in a collapsed state. The right end of the illustrated expanded vertebral distraction device 100 is the front end and the left end is the back end; when performing a surgical (e.g., minimally invasive) procedure to implant the expanded vertebral distraction device 100 into the body, the right end of the expanded vertebral distraction device 100 is first placed.

The expanding vertebral distraction device 100 of the present invention includes a hub 101, an expanding portion 102, and a distraction ring 103. The expansion part 102 and the expansion ring 103 are sleeved outside the shaft center 101; the expanding ring 103 is located between the shaft core 101 and the expanding portion 102 in the radial direction of the shaft core 101. The periphery of the body of the shaft center 101 is provided with threads, and the interior of the expanding ring 103 is provided with corresponding threads. The rear end (left end) of the shaft core 101 is an operation end 101A, and when the operation end 101A is rotated by the operator, the shaft core 101 is relatively rotated inside the expanding ring 103 (i.e., the expanding ring 103 is relatively rotated on the periphery of the body of the shaft core 101), and thus the shaft core 101 passes through the inside of the expanding ring 103 to perform relative linear movement (i.e., the expanding ring 103 is relatively moved in the axial direction of the shaft core 101). In the illustrated embodiment, operative tip 101A is hexagonal in shape and can be rotated by a surgical operator using a hexagonal tool; however, the present invention is not limited thereto, and the operation end 101A can be designed in any controllable rotation type, so that the operator can use the corresponding device to rotate.

The expanding portion 102 includes a lobe portion 102A, a fixing portion 102B, and a connecting portion 102C. The vane portion 102A has a plurality of vanes, and the vane thickness 102A1 gradually increases from the right to the left in the drawing, and the operation of this portion will be described later. The shape of the blade is not limited, and in the present embodiment, the axial plane projection of the blade on the shaft center 101 is rectangular, and the radial plane projection of the blade on the shaft center 101 is arc, but this is merely an example of one preferred embodiment. The fixing portion 102B fixes the relative position (in the axial direction of the shaft center 101) of the expanding portion 102 and the shaft center 101; the securing may be accomplished in any manner and the illustration of the present embodiment is merely exemplary. In this embodiment, the shaft 101 includes a flange 101B, and the fixing portion 102B is disposed outside the flange 101B and abuts against the operating end 101A. Thereby, the relative position of the expanded portion 102 and the shaft center 101 is fixed in the axial direction of the shaft center 101; however, the shaft core 101 is rotatable with respect to the expanding portion 102 inside the fixed portion 102B in the radial direction of the shaft core 101. The connecting portion 102C is used to connect the vane portion 102A and the fixing portion 102B.

When the operator rotates the shaft center 101 with respect to the expanding ring 103 (also rotates with respect to the expanding portion 102) and moves the shaft center 101 through the inside of the expanding ring 103 to the right, the expanding ring 103 moves to the left with respect to the expanding portion 102. Since the thickness 102a1 of the blade gradually increases from the right to the left in the drawing, when the expanding ring 103 moves to the left with respect to the expanding portion 102, the blade is expanded, and the vertebral body is expanded.

Referring to FIG. 2, in a preferred embodiment, the expanding ring 103 has at least one protrusion 103A, and preferably has at least as many protrusions 103A as there are blades. The protrusion 103A can extend into the gap formed after the blade is stretched and abut against one side of the blade, so that when the blade tends to be folded inward due to the resistance of the human body, the protrusion 103A abuts against one side of the blade, so that the stretching ring 103 is kept in position and cannot be easily forced to move back to the right.

In a preferred embodiment, the core 101 is hollow and has injection and outflow openings, so that after being implanted into a human body, filler, such as bone cement (bone cement) or bone graft (bone graft), can be injected from the injection openings through the hollow portion of the core 101 and then flow out of the outflow openings. For example, the filler may be injected into the human body from the left end (operation end 101A is provided with an injection opening) of the shaft 101 through the inside of the shaft 101 and from the right end (provided with an outflow opening) of the shaft 101. Referring to fig. 1 and 2, in a preferred embodiment, besides the filler is injected into the human body from the right-end outflow opening of the shaft 101 through the left-end injection opening of the shaft 101 and through the inside of the shaft 101, the shaft 101 may be provided with an outflow opening (an opening 101C is shown in fig. 1 and 2 for example) in the radial direction to increase the discharge channel of the filler. The number and size of the openings 101C are shown by way of example only, and the invention is not limited thereto.

Referring to FIG. 2, in a preferred embodiment, the width of each blade (i.e., the circumference in the radial plane) is D, and the width of the junction of the connection 102C and each blade is D, where D < D to reduce the amount of force required to open the blades, and preferably D < (1/2) D.

In a preferred embodiment, the right end of the shaft 101 may be fastened with a nut 109, or the nut 109 may be fixedly disposed to prevent the support ring 103 from completely disengaging from the shaft 101. However, if this is not a concern, nut 109 is not required and may be omitted.

Referring now to fig. 4 and 5, there is shown a distracted state and an exploded view of a spread-apart vertebral distractor device 200 according to another embodiment of the present invention. This example shows: the number of blades is not limited to two lobes but may be a greater number; the same is true of the number of projections 103A of the expanding ring 103. Referring to fig. 5, the fixing portion 102B and the connecting portion 102C are not limited to the shapes and structures shown in fig. 1-3, but may be modified; it is consistent with the spirit of the present invention that the fastening portion 102B can help to fix the relative position of the unfolding portion 102 and the shaft core 101 in the axial direction of the shaft core 101, and the connecting portion 102C can allow the blades to be unfolded.

The present invention has been described with respect to the preferred embodiments, but the above description is only for the purpose of making the content of the present invention easy to understand for those skilled in the art, and is not intended to limit the scope of the present invention. Those skilled in the art will recognize a variety of equivalent variations that are within the spirit of the invention. For example, other components may be added or at least one component described as being separate and independent in the embodiment may be integrated into a single component without affecting the main function, and for example, the fixing portion 102B and the connecting portion 102C of the expansion portion 102 may be regarded as being integrated into one part. For example, the axial plane projection of the blade on the shaft center 101 does not have to be rectangular, and the radial plane projection on the shaft center 101 does not have to be arc-shaped, and only the effect of spreading is required. Also for example, all of these can be analogized to the teachings of the present invention. Accordingly, the scope of the present invention should be determined to encompass all such equivalent variations as described above.

Claims

1. A deployment vertebral distraction device comprising:

an axis having a front end and a rear end;

the unfolding part is sleeved outside the shaft center and comprises a blade part, a fixing part and a connecting part, wherein the blade part is provided with a plurality of blades, and the thickness of each blade gradually becomes thicker from the front end to the rear end; the fixing part is used for fixing the relative position of the unfolding part and the axis in the axial direction of the axis, but allows the axis to rotate relative to the unfolding part in the fixing part in the radial direction of the axis; the connecting part is used for connecting the lobe part and the fixing part;

a support ring, which is sleeved outside the shaft center and is located between the shaft center and the unfolding part from the radial direction of the shaft center;

when the expanding ring moves towards the rear end relative to the expanding part, the blades are expanded, and the effect of expanding the vertebra is achieved.

2. The expanding vertebral distraction device of claim 1, wherein the body of the hub is threaded on the periphery and the distraction ring is correspondingly threaded on the interior.

3. The expanding vertebral distraction device of claim 2, wherein a posterior end of the hub is an operative end and is rotatable using a corresponding tool, thereby rotating the hub relative to the expanding portion within the fixation portion.

4. The expanding vertebral distractor device of claim 3, wherein the operative end is hexagonal.

5. The expanding vertebral distractor device of claim 1, wherein the distractor ring includes at least one projection configured to extend into a gap created after the leaves are expanded to abut an edge of at least one of the leaves.

6. The expanding vertebral distraction device of claim 1, wherein the periphery of the hub includes a flange, and the fixation portion is disposed about an exterior of the flange.

7. The expanding vertebral distractor device of claim 1, further comprising a nut attached to the front end of the shaft.

8. The deployment vertebrae distractor device of claim 1, wherein the shaft is hollow and has injection and outflow openings.

9. The deployment vertebral distraction device of claim 8, wherein the hub is provided with outflow openings in a radial direction.

10. The expanding vertebral distraction device of claim 1, wherein each leaf has a width D and the connection to each leaf has a width D, wherein D < (1/2) D.