TW201817395A - Spine spreading device capable of reducing the operating time and outwardly spreading two top boards in a parallel manner - Google Patents

Abstract

A spine spreading device comprises: a guide sleeve; a drive rod pivotally installed in the guide sleeve and provided with a left thread section and a right thread section; a first transmission member screwed to the left thread section of the drive rod; a second transmission member screwed to the right thread section of the drive rod; two top boards; and multiple connection bars, wherein at least one connection bar is pivotally connected between the first transmission member and a first end of each of the top boards, and at least one connection bar is pivotally connected between the second transmission member and a second end of each of the top boards. As a result, after the drive rod is driven to rotate, the first transmission member and the second transmission members are driven to move in opposite directions along an axial direction of the drive rod so as to drive each of the connection bars for respectively pushing the two top boards, which are originally in a folded condition, to the outside in a parallel manner.

Description

Spinal spreader

The invention relates to a spine spreading device, in particular to a spreading device that links left and right threads to shorten the operation time and can parallelly spread two top plates outward.

For patients whose vertebral body collapses due to accidental fracture or osteoporosis, the vertebral body can be opened and the fixation agent such as bone cement can be injected after the opening, as a new support structure to solve the vertebral body. Soreness and other discomforts caused by the collapse.

At present, the surgical method for expanding the collapsed vertebral body is usually performed by using a spreading device such as US Patent No. 8,986,386 B2, China CN 201356642 Y or US 8,734,497 A2, and then implanting it into the damaged vertebral body with a tool. Push it outwards to open and recover the collapsed vertebral body.

However, the aforementioned prior art has the following disadvantages:

1. In the US Patent No. 8,986,386 B2, the way to raise the top plate (6a, 6b) is to make the plate arms (12a, b, 13a, b) relatively close to the two ends (3a, 3b). , 14a, b, 15a, b) bending deformation, with the plate arms (12a, b, 13a, b, 14a, b, 15a, b) deformed upward, the top plate (6a, 6b) is pushed outwards, because the plate The arms (12a, b, 13a, b, 14a, b, 15a, b) cannot be accurately deformed in a predetermined direction, or can not push away the area with large resistance, and cannot push the collapsed bone to a predetermined position. And it has its shortcomings.

2. In the case of CN 201356642 Y, it is necessary to push the sliding rod (7) by rotating the nut (17) The connecting shaft (10) on the top to push the head (1) outward, but in operation, the nut (17) must be moved a very long distance to achieve the purpose of fully pushing the head outward, so the operating time is longer long.

3. In the US Patent No. 8,734,497 A2, as shown in FIG. 8A or the fifteenth figure herein, since the two top support arms (420) are pivotally connected to the link (422) at the center, the When the outer support is started to be stressed, the top support arm (420) is easily inclined, and the collapsed vertebral body cannot be lifted horizontally. In addition, in this case, the inner screw (414) was retracted inwardly to tighten the distance between the lower ends of the two connecting rods (422) to achieve the purpose of lifting the top support arm (420). (414) During the retracting process, the center point of the top support arm (420) will also be shifted. As shown in Figure 15, when the connecting rod (422) is pivotally connected with the inner screw (414), Point (b), when the internal screw (414) is retracted and moved to the position (b '), the top support arm (420) is also moved from the original point P1 (such as the dotted line position) in the X direction to point P2 ( (Such as the position of the solid line), that is, the distance moved by (S), that is, during the process of the support, the contact point of the support arm (420) and the vertebral body will change at any time and cannot be maintained at the same point. Opening the vertebral body makes the ejection process extremely unstable. Furthermore, when the inner screw (414) is retracted into the screw, the length of the inner screw (414) extending into the vertebral body is also shortened, and the loss is used as the strength of the structure.

In view of this, the creator of the present invention has made research and innovation to reveal the spinal distraction device of the present invention.

The purpose of the present invention is to provide a spinal distraction device, which includes: a guide sleeve; a driving rod, pivotally mounted in the guide sleeve, including a left thread segment and a right thread segment; a first A linkage member screwed to the left threaded section of the drive rod; a second linkage member screwed to the right threaded section of the drive rod; two top plates; and a plurality of links at the first end of each of the top plates and the At least one link is pivotally connected between the first linkage members, and at least one link is pivotally connected between the second end of each of the top plates and the second linkage member. If so, after driving the driving rod, the first linkage is linked. The two linkage members move relative to each other along the axial direction of the driving rod, and each of the connecting rods is moved in parallel to push out the two top plates that were originally in the folded state in parallel.

The spinal spreading device disclosed in the present invention, wherein the guide sleeve is provided with a guide groove in the axial direction, and the first and second linkage members are provided with a guide portion, so that the guide portion fits in the guide. Sliding in the groove is used to block the first and second linkage members from rotating in the guide sleeve, and guide the first and second linkage members to move axially along the axis of the drive shaft.

A spine spreading device disclosed in the present invention, wherein a link is pivotally connected between two sides of the first end of each top plate and the first linkage member, and is linked with the second side of the second end of the top plate. Between the components, a connecting rod is pivotally connected.

The spinal distraction device disclosed in the present invention further includes a screw penetrating through a through hole, and a connecting portion is provided at the front end, and the guiding sleeve is connected by the connecting portion.

The spinal spreading device disclosed in the present invention, wherein the screw includes: a body including a fixing screw hole, a socket is formed at the bottom of the fixing screw hole; a nail body contains a thread section, and the thread section A head is connected to the end, so that the head is pivoted in the socket of the seat; a pressing ring is placed in the seat, and the front end is placed on the head of the nail body in a fit; and A fixing screw is screwed into a fixing screw hole of the base body for forcing a connecting rod, and driving the connecting rod and the pressing ring toward the head of the nail body to fasten the connecting rod and The nail body.

The spine spreading device disclosed in the present invention is relatively axially moved by the first and second linkage members on the driving shaft, so as to drive the connecting rods pivotally connected to both ends of the top plate to move horizontally toward The two top plates are spread out, so it has the following advantages:

1. Linking the two top plates with a connecting rod, the mechanical strength of the connecting rod is much better than that of the plate arm of US 8,986,386 B2, so that the present invention can accurately displace according to a predetermined motion path and improve the uncertainty of the spreading operation.

2. The two top plates are opened outward in parallel. When the vertebral bodies are supported, each of the top plates will not tilt, which makes the operation of vertebral bodies more stable.

3. During the process of ejecting the two top plates outward, the two top plates will not produce lateral displacement, that is, the contact position with the vertebral body will not be changed, so that the operation of spreading the vertebral body is more reliable.

4. Simultaneously link the first and second linkage members with the left thread section and the right thread section to move in the opposite direction, so the operation time can be reduced by half and the time saving can be achieved.

The desirable entity of the present invention can be made clear by the following description and the accompanying drawings.

(10) ‧‧‧Opening device

(11) ‧‧‧Guide tube

(111) ‧‧‧Guide slot

(12) ‧‧‧Drive lever

(121) ‧‧‧Left thread section

(122) ‧‧‧Right thread section

(13) ‧‧‧The first linkage member

(131) ‧‧‧Guide

(14) ‧‧‧Second linkage member

(141) ‧‧‧Guide

(15a) (15b) ‧‧‧Top plate

(150a) ‧‧‧First End

(150b) ‧‧‧ second end

(151) ‧‧‧Tooth or Rough

(16) ‧‧‧ connecting rod

(20) ‧‧‧Screw

(21) ‧‧‧Body

(211) ‧‧‧Fixing screw hole

(212) ‧‧‧Chengxue

(22) ‧‧‧Nails

(221) ‧‧‧Thread Section

(222) ‧‧‧Head

(223) ‧‧‧through hole

(224) ‧‧‧Interfacing Department

(23) ‧‧‧Circle

(24) ‧‧‧Fixed screws

(25) ‧‧‧Connecting rod

(30) ‧‧‧Fixing agent

(D1) (D2) ‧‧‧Outer diameter

(T) ‧‧‧Tools

The first figure: a schematic diagram of the structure of the present invention when the two top plates are folded; the second figure: the schematic diagram of the present invention after the two top plates are opened outward; the third figure: a three-dimensional exploded schematic diagram of the present invention; the fourth Figure: is a perspective view of the invention in the collapsed state; Figure 5: is a schematic perspective view of the invention in the unfolded state; Figure 6: is a perspective exploded view of the invention in which a screw is connected to the spreading device; Figure 7: Figure 8 is a partial perspective exploded view of the embodiment shown in Figure 6; Figure 8 is a perspective view of the embodiment shown in Figure 6 in a collapsed state; Figure 9 is a schematic plan view of the embodiment shown in Figure 8; Figure 10: A perspective view showing the embodiment shown in Figure 8 in a stretched state; Figure 11: A schematic plan view of the structure of Figure 10; Figure 12: A sectional structure of the embodiment shown in Figure 8 Schematic diagram; Figure 13: Schematic diagram showing the implantation of the embodiment shown in Figure 12 in the vertebral body; Figure 14: Diagram showing the two top plates spread outward from Figure 13; and Fifteenth Figure: Schematic diagram of US8,734,497 A2 spread outwards.

Referring to the first to fifth figures, the present invention relates to a spinal spreading device (10), which includes: a guide sleeve (11); a driving rod (12), which is pivotally mounted on the shaft The guide sleeve (11) is driven by a tool (T) and contains a left thread section (121) and a right thread section (122); a first linkage member (13) is screwed on the guide member (13); A left threaded section (121) of the driving rod (12); a second linkage member (14) screwed to the right threaded section (122) of the driving rod (12); two top plates (15a, 15b); A rod (16), at least one link (16) is pivotally connected between the first end (150a) of each of the top plates (15a, 15b) and the first linkage member (13), and is connected to each of the top plates (15a, 15b) At least one link (16) is pivotally connected between the second end (150b) and the second linkage member (14). If so, after driving the driving rod (12), the first and second linkages can be linked The linkage member (13, 14) moves in the relative direction along the axial direction of the driving rod (12), and each of the connecting rods (16) is connected in parallel to parallelly retract the two top plates (15a, 15b) in the collapsed state, respectively, Push out.

As shown in the first to fifth figures, the spinal distraction device (10) disclosed in the present invention, wherein the guide sleeve (11) is axially provided with a guide groove (111), and the first and second linkage members (13, 14) is provided with a guide portion (131, 141), so that the guide portion (131, 141) slides correspondingly in the guide groove (111) for blocking the first and second linkages The component (13, 14) rotates in the guide sleeve (11) and restricts the The first and second linkages (13, 14) can be stably displaced axially along the axis of the driving rod (12).

The above-mentioned guide sleeve (11) can be composed of two separate or two components connected at one end to sandwich the first and second linkage members (13, 14) inside, and at least one hoop member (112 ) Is tightly clamped on the outer edge of the guide sleeve (11) formed by the two components mating.

The spinal distraction device (10) disclosed in the present invention, wherein the driving rod (12) is composed of two elements axially connected as shown in the third figure, such as the left thread section (121) and the right thread section (122) axially interconnected.

As shown in the third figure, the spine spreading device disclosed in the present invention can be pivotally connected between the two sides of the first end of each of the top plates (15a, 15b) and the first linkage member (13). A rod (16), and a link (16) is pivotally connected between two sides of the second end of each of the top plates (15a, 15b) and the second linkage member (14).

The spine spreading device (10) disclosed in the present invention, wherein the shape and number of each of the connecting rods (16) is not limited by the present invention; each of the connecting rods (16) can be a pin or a shaft, etc. It is mounted on the first and second linkage members (13, 14), or is otherwise pivotally connected to the first and second linkage members (13, 14). The present invention is not limited in this regard.

The spine spreading device (10) disclosed in the present invention, wherein each of the connecting rods (16) is not limited in its shape by itself; each of the connecting rods (16) can be pivotally mounted on the corresponding top plate by pins or shafts (15a, 15b), or otherwise pivotally connected to each of the corresponding top plates (15a, 15b), the present invention is not limited thereto.

The spine spreading device (10) disclosed in the present invention, wherein the outer edge of each of the top plates (15a, 15b) may be provided with a tooth portion or a rough portion (151) to abut the surface of the spread vertebral body. In order to avoid sliding or displacement during the spreading process, the operation stability of the present invention is improved.

As shown in the sixth to fourteenth figures, the spinal distraction device (10) disclosed in the present invention further includes a screw (20), the screw (20) penetrates a through hole (223), and a connection is provided at the front end. And the guide sleeve (11) is connected by the connecting portion (224).

As shown in the ninth figure, the spine spreading device (10) disclosed in the present invention, when the spreading device (10) is in the collapsed state, the outer diameter (D1) formed by the two top plates (15a, 15b) Less than or equal to the outer diameter (D2) of the screw (20). Therefore, in the application, as shown in the eighth, ninth, and thirteenth drawings, a greater than or equal to the collapse can be pre-punched on the vertebra of the patient. In the state, the outer diameter (D1) of the spreading device is smaller than the hole of the outer diameter (D2) of the screw (20), so that the spreading device (10) at the front end of the screw (20) of the present invention can be worn smoothly. Into the hole, and by rotating the screw (20), the screw (20) is locked in the vertebra, and the spreading device (10) is also moved into the vertebra that the patient needs to spread. , For vertebral body expansion.

As shown in the fourteenth figure, after the vertebral body spreading device (10) disclosed in the present invention, after the vertebral body is stretched to a predetermined position, it can follow the through hole (223) penetrated by the screw (20) or connect the guide The tool (T) of the guide cannula (11) is injected with a fixative (30) such as bone cement into the space opened by the spreading device (10), and the spreading device (10) is left in the vertebral body. After the fixing agent (30) is cured, the spreading device (10) can be fixed inside to form a structure that supports the vertebral body, or an anchor that blocks the screw (20) from sliding outward. .

As shown in Figures 6 and 7, the spine spreading device (10) disclosed in the present invention, wherein the engaging portion (224) at the front end of each screw (20) may be a screw hole to lock the spreading device ( 10) the guide sleeve (11); the screw (20) can still be connected in a pin or riveted manner, so that the joint portion (224) and the guide sleeve (11) of the spreading device (10) Combined with each other, the present invention does not limit the combination of the self-limiting screw (20) and the spreading device (10).

As shown in Figures 6 and 14, the spinal distraction device (10) disclosed in the present invention, wherein the screw (20) includes: a body (21), including a fixing screw hole (211), in the fixing screw A hole (212) is formed at the bottom of the hole (211); a nail body (22) contains a thread section (221), and a head (222) is connected to the end of the thread section (221), so that the head The part (222) is pivoted in the socket (212) of the base body (21), and the nail body (22) axially penetrates a through hole (223), and the front end of the nail body (22) forms the An engaging portion (224); a tightening ring (23) placed in the base body (21), the front end of which is fit across the head (222) of the nail body (22); and a fixing screw (24) ), Screwed into the fixing screw hole (211) of the base body (21), for pressing a connecting rod (25), and driving the connecting rod (25) and the pressing ring (23) toward the nail body The head (222) of (22) is displaced to fasten the connecting rod (25) and the nail body (22).

The spinal distraction device (10) disclosed in the present invention, wherein the thread segment (221) is a multi-thread thread, so that the present invention can shorten the time for locking the vertebra, and the above-mentioned thread segment (221) can be a three-thread thread or The four-wire thread is not limited by the present invention.

The structure and shape of the spinal distraction device disclosed in the present invention can be modified without departing from the spirit or scope of the present invention. The present invention is not limited to the above-mentioned embodiments.

Claims (10)

A spinal distraction device includes: a guide sleeve; a driving rod, pivotally mounted in the guide sleeve, including a left thread segment and a right thread segment; a first linkage member screwed on A left threaded section of the drive rod; a second linkage member screwed to the right threaded section of the drive rod; two top plates; and a plurality of links at least pivoted between the first end of each top plate and the first linkage member A link is connected, and at least one link is pivotally connected between the second end of each top plate and the second linkage member. After the driving rod is driven, the first and second linkage members are linked along the driving rod. The axial movements are in opposite directions, and each of the connecting rods is moved in parallel, and the two top plates in the collapsed state are pushed out in parallel. The spinal distraction device according to claim 1, wherein the guide sleeve is provided with a guide groove axially, and the first and second linkage members are provided with a guide portion, so that the guide portion fits in the guide portion. The guide groove is slid to prevent the first and second linkage members from rotating in the guide sleeve, and guide the first and second linkage members to move axially along the guide sleeve. The spinal distraction device according to claim 1, wherein a link is pivotally connected between the two sides of the first end of each top plate and the first linkage member, and the two sides of the second end of the top plate are connected to the first A connecting rod is pivotally connected between the two linkage members. The spinal distraction device according to claim 1, wherein the driving rod system is composed of two elements axially connected. The spinal distraction device according to claim 1, wherein a tooth portion or a rough portion is provided on an outer edge of each of the top plates. The spinal distraction device according to claim 1, wherein the guide sleeve is composed of two components that are separated or connected at one end and are used to enclose the first and second linkage members inside, and at least a hoop The piece is tightly clamped on the outer edge of the guide sleeve formed by the two components being mated. The spinal distraction device according to claim 1, further comprising a screw penetrating through a through hole, and a connecting portion is provided at the front end, and the guiding sleeve is connected with the connecting portion. The spinal distraction device according to claim 7, wherein the screw comprises: a body containing a fixing screw hole, forming a socket at the bottom of the fixing screw hole; a nail body containing a threaded section, wherein A head is connected to the end of the threaded section, so that the head is pivoted in the socket of the seat body, and the nail body is axially penetrated through the through hole, and the connecting part is formed at the front end of the nail body; A tightening ring is placed in the base body, and its front end is placed on the head of the nail body in a fit; and a fixing screw is screwed into the fixing screw hole of the base body to force a connecting rod, And the displacement of the connecting rod and the pressing ring toward the head of the nail body is driven to fasten the connecting rod and the nail body. According to the spinal distraction device described in claim 7, when the collapsed state, the outer diameter formed by the two top plates is less than or equal to the outer diameter of the screw. The spinal distraction device according to claim 7, wherein the engaging portion at the front end of each screw is a screw hole.