WO2019148344A1

WO2019148344A1 - Expandable coil implant for minimally invasive spine surgery

Info

Publication number: WO2019148344A1
Application number: PCT/CN2018/074673
Authority: WO
Inventors: 肖志娟
Original assignee: 肖志娟
Priority date: 2018-01-31
Filing date: 2018-01-31
Publication date: 2019-08-08

Abstract

An expandable coil implant for minimally invasive spine surgery. The expandable coil implant is formed by winding a hollow tube around an axis into a spiral coil and comprises a plurality of adjacent coil rings (1). An elastic deformation notch (6) and densely distributed liquid outlet ports (4) are provided at an inner side of the coil ring (1). An anti-expansion protrusion (2) is provided at a lower surface of the coil ring (1), and an anti-expansion recess (3) is provided at an upper surface of the same. The adjacent coil rings (1) engage with each other from top to bottom by means of the anti-expansion protrusion (2) and the anti-expansion recess (3). A hollow tube opening (8) is provided inside the coil ring (1) and in communication with the liquid outlet ports (4). The expandable coil implant has a simple structure and is easy to use. The coil adopts a linear hollow tube shape when outside the body, so as to facilitate storing, and after being inserted inside the body, gradually forms a spiral coil when implanted into a vertebra body. During surgery, only a single incision is required to complete entire procedures, such as positioning, vertebral body expansion and injecting bone cement into the coil, and the injected bone cement is enclosed and surrounded by the coil in order to prevent leakage and compression on other tissues or peripheral nerves, thereby mitigating surgical risks and burdens on patients.

Description

Implantable extension coil for minimally invasive spine

Technical field

The invention relates to the technical field of medical instruments, and in particular to an implantable extension coil of a minimally invasive spine.

Background technique

Spinal vertebral collapse caused by osteoporosis is a common disease. At present, the conventional surgical treatment of spinal surgery is to adjust and control the intervertebral distance of the spine vertebral collapse, and to inject cement into the cavity to fix it. Forming. In the traditional spinal surgery method, the double-cutting operation is generally adopted, that is, two incisions are made in the posterior of the spine. First, the spine balloon is inserted from one incision, and the developable liquid is injected to expand the spinal interstitial space, and the spine spacing is basically restored. The distance to the original gap is then inserted into the bone cement perfusion device from another incision, and the bone cement is injected into the fracture of the vertebral body of the spine, and the bone cement is injected while reducing the balloon until the bone cement is solidified and repaired.

Chinese patent CN105188614A discloses a coiled spinal implant for replacement or reconstruction of an intervertebral disc, vertebral body and spinal motion segment, the coiled spinal implant comprising a plurality of loops and a gap between the loops, Wherein the ring is formed of a hollow material and has a plurality of holes or longitudinal slits extending through the sidewall of the ring to the hollow center; the coiled implant includes one or more located within the hollow center A gap between the balloon, the coil loops, and/or the central void surrounded by the coils.

However, the above-mentioned techniques have the following drawbacks: 1. The double incision increases the surgical burden; 2. When the bone cement is perfused, it is necessary to continuously reduce the size of the balloon to make room, so the spacing of the spine cannot be expanded to the original size; 3. When the bone cement is filled, there is no edge. Constrained by the limit device, the perfused bone cement easily overflows the spinal vertebral body and compresses the surrounding tissue and nerves.

Summary of the invention

In order to overcome the deficiencies in the prior art, the present invention aims to provide an implantable extension coil of a minimally invasive spine, which can enter from a single incision in a spinal vertebral body repair and form a support structure in the minimally invasive spinal vertebral body. Directional injection and wrapping of the bone cement is completed.

In order to solve the above technical problem, the present invention provides an implantable extension coil of a minimally invasive spine, which is spirally wound around a shaft by a length of hollow tube, including a plurality of adjacent coil loops; An inner side of the coil ring is provided with an elastic deformation slit and a dense liquid discharge hole. The lower surface of the coil ring is provided with an anti-expansion boss. The upper surface of the coil ring is provided with an anti-expansion groove, and the adjacent coil ring passes through The anti-expansion boss and the anti-expansion groove are vertically matched; the coil ring is provided with a hollow tube hole, and the liquid discharge hole is in communication with the hollow tube hole.

Through the above structure, the hollow tube can be prevented from being formed due to the relative slip of the adjacent coil ring when it is coiled, and the implantable extension coil is collapsed after being stressed, so that the minimally invasive spine cannot be supported. The invention can enter from a single incision in the spinal vertebral body repair, and form a support structure in the minimally invasive spinal vertebral body to complete the directional injection and wrapping of the bone cement, thereby reducing the risk of surgery and the burden on the patient.

Preferably, the front end of the implantable extension coil is provided with a bevel cut.

From above, the guide is easily inserted through the beveled cut.

Wherein, an outer side of the implantable extension coil is provided with an anti-skid curve.

Further, the four corners of the cross section of the hollow tube are rounded into an arc shape, and the hollow tube hole has a circular cross section.

From above, it facilitates the molding of the implantable extension coil and the wrapping of the bone cement.

Compared with the prior art, the beneficial effects of the present invention are:

The implantable extension coil of the minimally invasive spine of the invention has the advantages of simple structure and convenient use, and the linear hollow tube is convenient for storage in vitro, and is gradually implanted into the spine body to form a spiral coil after being inserted into the body; The entire process of positioning, vertebral body expansion and intra-arterial infusion of bone cement, while the injected bone cement has a coil enveloping package will not leak out to oppress other tissues and peripheral nerves, reducing the risk of surgery and patient burden.

DRAWINGS

In order to more clearly illustrate the technical solutions of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a schematic view showing the overall structure of an implantable extension coil of a minimally invasive spine according to an embodiment of the present invention;

2 is a perspective view of an implantable extension coil of a minimally invasive spine according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1 and FIG. 2, the embodiment relates to an implantable extension coil of a minimally invasive spine, which is spirally wound around a shaft by a hollow tube, and includes: a plurality of adjacent coil loops 1 and a coil loop. 1 is provided with a hollow tube hole 8; the inner side of the coil ring 1 is provided with an elastic deformation slit 6 and a dense liquid discharge hole 4, and the lower surface of the coil ring 1 is provided with an anti-expansion boss 2, on the coil ring 1 The surface is provided with an anti-expansion groove 3, and the adjacent coil ring 1 is fitted up and down by the anti-expansion boss 2 and the anti-expansion groove 3, so as to prevent the adjacent coil ring 1 from slipping when the hollow tube is coiled, and cannot be formed. And the implantable extension coil collapses after being forced to support the minimally invasive spine; the drain hole 4 communicates with the hollow tube hole 8 to facilitate bone cement injection and filling.

Further, the front end of the implantable extension coil of the present invention is provided with a beveled slit 5 for facilitating insertion of the guide, and an anti-slip curve 7 is provided on the outer side of the implantable extension coil. The four corners of the hollow tube are rounded into an arc shape to facilitate the molding of the implantable expansion coil and the wrapping of the bone cement; the hollow tube hole 8 preferably has a circular cross section. The number of the coil loops 1 varies depending on the size of the spine pitch to be supported.

In the invention, the head of the hollow tube is first inserted into the end hole of the guide, and the rotating coil adjusting handle screwes the hollow tube into the guide and leaves the tail of the hollow tube; then the memory alloy guiding tube is Insert the tail of the hollow tube, rotate the guide tube to adjust the handle to the sleeve of the guide tube into the sleeve at the front end of the guide, and place the sleeve in the special thermostat heater of the guide until the temperature of the guide tube rises to 37 ° C; The front end of the guide is inserted from the surgical incision into the vertebral body of the spine to be repaired, and the rotating guide tube adjusting handle rotates the guiding tube from the side hole of the sleeve at the front end of the guide, and the memory alloy guiding tube is driven when it is unscrewed. The empty tube forms a spiral implantable extension coil, and gradually expands the spine vertebral body gap until the requirement is met; finally, the rotation guide tube adjustment handle gradually withdraws the guide tube, and injects from the tail of the guide tube during the gradual withdrawal of the guide tube The bone cement and the bone cement enter the implantable expansion coil through the hollow tube hole 8 and are injected into the coil cofferdam from the liquid discharge hole 4 until the filling is completed, and the guide is taken after the bone cement is filled and solidified. Out of the body.

The above disclosure is only a few preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and thus equivalent changes made by the claims of the present invention are still within the scope of the present invention.

Claims

An implantable extension coil of a minimally invasive spine, characterized in that: the implantable extension coil is spirally wound around a shaft by a hollow tube, comprising a plurality of adjacent coil loops;

An inner side of the coil ring is provided with an elastic deformation slit and a dense liquid discharge hole, and a lower surface of the coil ring is provided with an anti-expansion boss, and an upper surface of the coil ring is provided with an anti-expansion groove, and the adjacent coil ring passes The anti-expansion boss and the anti-expansion groove are matched up and down;

A hollow tube hole is disposed in the coil ring, and the liquid discharging hole is in communication with the hollow tube hole.
The implantable expandable coil of the minimally invasive spine of claim 1 wherein the front end of the implantable expandable coil is provided with a beveled cut.
The implantable extension coil of the minimally invasive spine of claim 1 wherein the outer side of the implantable extension coil is provided with an anti-slip curve.
The implantable expandable coil of the minimally invasive spine according to claim 1, wherein the four corners of the cross section of the hollow tube are rounded into an arc shape, and the hollow tube hole has a circular cross section.