CN111012418A - Vertebral body dilator - Google Patents

Abstract

The invention relates to a vertebral body dilator, which comprises a dilator main body and an inner core; a plurality of annular convex parts are arranged on the retaining part of the inner core; the plurality of lobes are arranged along an axial direction of the inner core; two annular inner convex parts are arranged on an inner hole of the sliding part of the expander body; the sliding part can slide in one direction relative to the stopping part, so that the bracket part of the dilator body deviates relative to the axis of the dilator body and the dilator body is expanded; the inner hole of the sliding part of the vertebral body dilator is provided with the two annular inner convex parts, so that the backstop effect can be ensured, and the axial length of the sliding part does not need to be additionally lengthened; set up a plurality of little archs and a plurality of little pits on the straight flange of the annular bellying of convex part, inner core in the annular of expander main part respectively, during a plurality of little archs just in time imbed a plurality of little pits, make the annular bellying support each other with the straight flange of convex part in the annular and lean on, stability improves, further improves the stopping effect.

Description

Vertebral body dilator

Technical Field

The invention relates to the field of medical instruments, in particular to a vertebral body expander.

Background

Percutaneous vertebroplasty/percutaneous kyphoplasty is a common mature minimally invasive spine surgery at present, and the treatment means is to inject bone cement into a vertebral body to increase the strength and stability of the vertebral body, wherein in some patients with serious vertebral body collapse, the collapsed vertebral body needs to be expanded by expandable implants such as a balloon or a dilator to form a cavity which can be filled with the bone cement.

In order to prevent the dilator from contracting again after expansion to influence the operation effect, a relative pawl structure is arranged between the dilator main body and the inner core of the existing vertebral body dilator, and although the pawl structure can ensure a certain stopping effect, the pawl structure can not ensure the stopping effect sometimes due to the problems of processing and assembling precision.

Therefore, there is a need for a safer and more reliable vertebral body dilator, which ensures the proper operation of the vertebral body dilator.

Disclosure of Invention

The invention aims to provide an implantation product of a vertebral body dilator, which is used for ensuring the dilation effect after a vertebral body forming operation and ensuring the normal work of the vertebral body dilator.

In order to solve the technical problems, the invention adopts the following specific technical scheme:

a vertebral body dilator comprises a dilator main body and an inner core; the inner core comprises an external thread end part, an inner core straight rod part and a backstop part; a plurality of discharge ports are formed in the inner core straight rod part; the retaining part is provided with a plurality of annular convex parts; the plurality of lobes are arranged along an axial direction of the inner core; the backstop portion comprises a plurality of notches to facilitate deforming movement of the dilator body; the expander main body comprises an internal thread end part, a bracket part, an expanding part and a sliding part; two annular inner convex parts are arranged on an inner hole of the sliding part; the external thread end of the inner core is in threaded connection with the internal thread end of the expander main body, and the sliding part can slide in one direction relative to the stopping part, so that the support part of the expander main body deviates relative to the axis of the expander main body, and the expander main body is expanded.

Further, the section of the annular inner convex part is trapezoidal, the side edge of the annular inner convex part close to the end part of the internal thread is a bevel edge, and the side edge far away from the end part of the internal thread is a straight edge, namely the side edge is vertical to the axis of the dilator body; the straight edge of the annular inner convex part is provided with the plurality of small bulges; the cross sections of the annular convex parts of the inner core are also trapezoidal, and the side edges of the annular convex parts, close to the end part of the external thread, are straight edges, namely are vertical to the axis of the inner core; the side edge of the screw thread far away from the end part of the external thread is a bevel edge; the straight edges of the annular convex parts are provided with a plurality of small concave pits which are matched with the small convex parts on the annular inner convex part, and the small convex parts are just embedded into the small concave pits.

Further, the section of the annular inner convex part is trapezoidal, the side edge of the annular inner convex part close to the end part of the internal thread is a bevel edge, and the side edge far away from the end part of the internal thread is a straight edge, namely the side edge is vertical to the axis of the dilator body; the straight edge of the annular inner convex part is provided with the plurality of small pits; the cross sections of the annular convex parts of the inner core are also trapezoidal, and the side edges of the annular convex parts, close to the end part of the external thread, are straight edges, namely are vertical to the axis of the inner core; the side edge of the screw thread far away from the end part of the external thread is a bevel edge; the straight edges of the annular convex parts are provided with a plurality of small bulges which are matched with the small pits on the annular inner convex part, and the small bulges are just embedded into the small pits.

The invention has the following beneficial effects: compared with the prior art, the inner hole of the sliding part of the vertebral body dilator is provided with the two annular inner convex parts, so that the backstop effect can be ensured, and the axial length of the sliding part does not need to be additionally lengthened; set up a plurality of little archs and a plurality of little pits on the straight flange of the annular bellying of convex part, inner core in the annular of expander main part respectively, during a plurality of little archs just in time imbed a plurality of little pits, make the annular bellying support each other with the straight flange of convex part in the annular and lean on, stability improves, further improves the stopping effect.

Drawings

FIG. 1: the whole structure diagram of the vertebral body expander is shown;

FIG. 2: the construction of the inner core of the invention;

FIG. 3: structure of the dilator body of the invention when not expanded:

FIG. 4: the structure of the dilator body in the process of opening;

FIG. 5: a partial enlarged view at a in fig. 3;

FIG. 6: the invention relates to a retaining structure diagram of a dilator main body and an inner core.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the drawings and the specific examples.

As shown in fig. 1, a vertebral body expander comprises an expander body 1 (shown in fig. 1 in an expanded state) and an inner core 2.

As shown in fig. 2, the inner core 2 includes an externally threaded end portion 20, an inner core straight shank portion 21, and a backstop portion 23; a plurality of discharge ports 22 are arranged on the inner core straight rod part 21; the retaining part 23 is provided with a plurality of annular convex parts 24; a plurality of bosses 24 are arranged in the axial direction of the inner core 2; the backstop 23 includes a plurality of notches 25 to facilitate the deforming movement of the dilator body 1.

As shown in fig. 3 to 4, the expander body 1 includes an internally threaded end portion 10, a stent portion 12, an expanding portion 11, and a sliding portion 13; two annular inner convex parts 14 and 15 are arranged on an inner hole of the sliding part 13; only one inner convex part is arranged in the prior art, and one inner convex part cannot ensure that the dilator body cannot shrink after being expanded; meanwhile, considering that the axial position of the sliding part is limited, the arrangement of the more than three inner convex parts cannot ensure that the sliding part and the convex parts on the inner core play a good blocking role, and therefore through design analysis, the sliding part 13 is provided with the two inner convex parts 14 and 15, so that the backstop effect can be ensured, and the axial length of the sliding part does not need to be additionally lengthened.

The external thread end part 20 of the inner core 2 is in threaded connection with the internal thread end part 10 of the dilator body 1, the sliding part 13 can slide in one direction relative to the backstop part 23, so that the bracket part 12 of the dilator body 1 deviates relative to the axis of the dilator body 1, and the dilator body 1 is expanded; at this time, the annular inner convex portions 14 and 15 of the sliding portion 13 abut against the annular convex portion 24 of the retaining portion 23, and the dilator body 1 is held in an expanded state.

As shown in fig. 5, the cross section of the annular inner convex parts 14 and 15 of the dilator body 1 is trapezoidal, the side of the inner convex part close to the internal thread end 10 is a bevel edge, and the side far away from the internal thread end 10 is a straight edge, namely, the side is perpendicular to the axis of the dilator body 1; further, a plurality of small protrusions 140,150 are provided on the straight edges of the annular inner protrusions 14, 15.

As shown in fig. 6, the cross section of the plurality of annular protrusions 24 of the inner core 2 is also trapezoidal, and the side of the annular protrusions close to the external thread end 20 is a straight side, namely, perpendicular to the axis of the inner core 2; the side remote from the end 20 of the external thread is beveled; the straight edges of the annular convex parts 24 are provided with a plurality of small concave pits 240 which are matched with the small convex parts 140 and 150 on the annular inner convex parts 14 and 15, and the small convex parts 140 and 150 are just embedded into the small concave pits 240, so that the straight edges of the annular convex parts 24 and the annular inner convex parts 14 and 15 are mutually abutted, the stability is improved, and the backstop effect is further improved.

Further, a plurality of small concave pits may be provided on the straight edges of the annular inner convex portions 14,15, a plurality of small convex portions may be provided on the straight edges of the annular convex portion 24, and the plurality of small concave pits and the plurality of small convex portions may be matched.

However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.

Claims (3)

1. A vertebral body dilator, which comprises a dilator main body (1) and an inner core (2); the method is characterized in that: the inner core (2) comprises an external thread end part (20), an inner core straight rod part (21) and a backstop part (23); a plurality of discharge ports (22) are arranged on the inner core straight rod part (21); a plurality of annular convex parts (24) are arranged on the retaining part (23); the plurality of protrusions (24) are arranged in the axial direction of the inner core (2); the backstop (23) comprises a plurality of notches (25) facilitating the deformation movement of the dilator body (1); the expander main body (1) comprises an internal thread end part (10), a bracket part (12), an expanding part (11) and a sliding part (13); two annular inner convex parts (14, 15) are arranged on the inner hole of the sliding part (13); the external thread end part (20) of the inner core (2) is in threaded connection with the internal thread end part (10) of the dilator body (1), and the sliding part (13) can slide in one direction relative to the stopping part (23) to deviate the support part (12) of the dilator body (1) relative to the axis of the dilator body (1) and expand the dilator body (1); the annular inner convex parts (14, 15) of the sliding part (13) abut against the annular convex part (24) of the retaining part (23) to keep the expander body (1) in an expanded state.

2. A vertebral body expander according to claim 1 and further comprising: the section of the annular inner convex parts (14, 15) is trapezoidal, the side edges of the annular inner convex parts close to the internal thread end part (10) are oblique edges, and the side edges far away from the internal thread end part (10) are straight edges, namely the side edges are vertical to the axis of the dilator body (1); the straight edges of the annular inner convex parts (14, 15) are provided with the plurality of small bulges (140, 150); the cross section of the annular convex parts (24) of the inner core (2) is also trapezoidal, and the side edges of the annular convex parts close to the external thread end part (20) are straight edges, namely are vertical to the axis of the inner core (2); the side edge of the screw thread far away from the end part (20) of the external thread is a bevel edge; a plurality of small pits (240) are arranged on the straight edges of the annular convex parts (24) and matched with the small bulges (140, 150) on the annular convex parts (14, 15), and the small bulges (140, 150) are just embedded into the small pits (240).

3. A vertebral body expander according to claim 1 and further comprising: the section of the annular inner convex parts (14, 15) is trapezoidal, the side edges of the annular inner convex parts close to the internal thread end part (10) are oblique edges, and the side edges far away from the internal thread end part (10) are straight edges, namely the side edges are vertical to the axis of the dilator body (1); the straight edges of the annular inner convex parts (14, 15) are provided with the small pits; the cross section of the annular convex parts (24) of the inner core (2) is also trapezoidal, and the side edges of the annular convex parts close to the external thread end part (20) are straight edges, namely are vertical to the axis of the inner core (2); the side edge of the screw thread far away from the end part (20) of the external thread is a bevel edge; the straight edges of the annular convex parts (24) are provided with a plurality of small bulges which are matched with the small pits on the annular inner convex parts (14, 15), and the small bulges are just embedded into the small pits.

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