KR-20260065986-A - Spinal implants for dynamic stabilization

Abstract

An intervertebral implant for stabilizing adjacent first and second spinous processes. The implant comprises a spacer having a latch housing wall that extends from a first surface to a second surface and forms a latch housing within the spacer. Additionally, the spacer has first and second sides configured to engage with each of the adjacent first and second spinous processes. The spacer may form multiple slots configured to accommodate portions of a flexible strap that encloses the adjacent first and second spinous processes. The latch may be configured to rotate about a latch axis between a first rotational position and a second rotational position within the latch housing.

Inventors

• 바셀리 크리스띠앙
• 세네까스 야꾸에스

Assignees

• 컴패니언 스파인 프랑스

Dates

Publication Date

20260512

Application Date

20240307

Priority Date

20230307

Claims (20)

1. As an intervertebral implant for stabilizing adjacent first and second spinous processes, the implant is: A spacer having a first surface on the opposite side of a second surface, wherein the spacer has a latch housing wall extending from the first surface to the second surface to form a latch housing within the spacer, and The above spacer has a first side on the opposite side of the second side, and the first side and the second side are each configured to engage with each of the respective first and second pole protrusions among the adjacent pole protrusions. The spacer also forms first, second, and third slots extending through the spacer from the first side to the second side, and each of the first, second, and third slots is configured to accommodate portions of a flexible strap that surrounds the adjacent first and second pole projections; and A latch fixed within the latch housing and configured to rotate about a latch axis between a first rotational position and a second rotational position within the latch housing, comprising the latch having a first surface and a second surface located at different distances from the axis. When the latch is in the first rotational position, the first surface of the latch faces the latch housing wall at a distance from the latch housing wall greater than the thickness of the flexible strap, thereby allowing the strap to move freely between the first surface of the latch and the latch housing wall, and An additional implant that, when the latch is in the second rotational position, the second face of the latch faces the latch housing wall at a distance from the latch housing wall that is smaller than the thickness of the flexible strap, thereby restricting the strap from moving between the second face of the latch and the latch housing wall.
2. In paragraph 1, An intervertebral implant, wherein the above latch includes a head forming a tool receiving opening at a first end, and the tool receiving opening is configured to be engaged by a tool to rotate the latch between a first rotational position and a second rotational position.
3. In paragraph 1, An intervertebral implant, wherein the head of the above latch comprises a head surface having at least one notch formed internally.
4. In paragraph 3, An intervertebral implant further comprising a locking mechanism retained within the spacer, wherein when the latch is in the first rotational position, the locking mechanism engages with the head surface without entering the notch, and when the latch is in the second rotational position, the locking mechanism enters the notch to prevent the latch from rotating further, and the locking mechanism is movable within the spacer.
5. In paragraph 4, The above locking mechanism is an intervertebral implant, wherein one end of the spring rod is fixed within the spacer and the other end of the spring rod is movable into the notch.
6. In paragraph 5, The above locking mechanism comprises two spring rods disposed on opposite sides of the latch housing, an intervertebral implant.
7. In paragraph 6, An intervertebral implant, wherein the latch head comprises a plurality of notches formed around the circumference, and the spring rods can move to any one of the plurality of notches to lock the latch to a plurality of different rotational positions relative to the latch housing.
8. In paragraph 1, The above latch is an intervertebral implant comprising a ferrule that retains the latch within the latch housing at the opposite end of the head.
9. In paragraph 1, The first surface of the above latch is a flat intervertebral implant.
10. In Paragraph 9, The above latch comprises two flat first latch surfaces disposed on opposite sides of the latch, and the two flat latch surfaces are at a first latch surface distance from each other, an intervertebral implant.
11. In Paragraph 10, The first and second slots are spaced apart from each other by a slot distance, and The first and second slots above intersect with the latch housing, and An intervertebral implant, wherein the distance of the first latch surface is less than or equal to the distance of the first slot, so that the flexible strap moves freely across all of the first flat latch surfaces.
12. In paragraph 1, An intervertebral implant in which the second surface of the latch and the latch wall are both curved to be complementary to each other.
13. As an intervertebral implant for stabilizing adjacent first and second spinous processes, the implant is: A spacer having a first side on the opposite side of a second side, wherein the first side and the second side are each configured to engage with each of the respective first and second pole protrusions among the adjacent pole protrusions, and The spacers have first and second surfaces facing each other and perpendicular to the first and second sides, and the spacers have a latch housing wall extending from the first surface to the second surface to form a latch housing within the spacers. The spacer forms at least one slot extending from the first side to the second side through the spacer, the at least one slot intersects the latch housing, and the at least one slot is configured to accommodate a portion of a flexible strap for wrapping each of the adjacent first and second pole projections; The latch is located within the latch housing and is configured to rotate about a latch axis between a first rotational position in which the strap can move freely between a first surface of the latch and a wall of the latch housing, and a second rotational position in which the movement of the strap is restricted between a second surface of the latch and a wall of the latch housing; and An intervertebral implant comprising a locking mechanism retained within the spacer and configured to selectively engage with the latch to prevent the latch from rotating within the latch housing when the latch is in the second rotational position.
14. In Paragraph 13, The above latch has a head adjacent to the first surface of the spacer, and the head forms a notch, an intervertebral implant.
15. In Paragraph 14, The above locking mechanism is an intervertebral implant, wherein one end of the spring rod is fixed within the spacer and the other end of the spring rod is movable into the notch.
16. In paragraph 15, The above spacer limits the channel where the spring load remains, and An intervertebral implant, wherein when the latch is rotated to a position where the notch is aligned with the channel, at least a portion of the spring rod moves from the channel to the notch to prevent the latch from rotating further within the latch housing.
17. In Paragraph 16, The above locking mechanism comprises two spring rods disposed on opposing sides of the latch housing, an intervertebral implant.
18. In Paragraph 17, An intervertebral implant, wherein the latch head comprises a plurality of notches formed around the circumference, and the spring rods can move to any one of the plurality of notches to lock the latch to a plurality of different rotational positions relative to the latch housing.
19. In Paragraph 13, The above latch has a first surface and a second surface located at different distances from the axis, respectively, and Since the first surface of the latch faces the latch housing wall at a distance from the latch housing wall greater than the thickness of the flexible strap, when the latch is in the first rotational position, the strap can move freely between the first surface of the latch and the latch housing wall, and Additionally, an intervertebral implant in which, because the second surface of the latch faces the latch housing wall at a distance from the latch housing wall that is smaller than the thickness of the flexible strap, when the latch is in the second rotational position, the strap is restricted from moving between the second surface of the latch and the latch housing wall.
20. In Paragraph 13, The above at least one slot includes two slots, and the flexible strap has a first portion extending through one slot and a second portion extending through another slot, and An intervertebral implant, wherein both parts of the flexible strap extending through the two slots are configured to be restricted from moving between the second faces of the latch and the latch housing wall.

Description

Spinal implants for dynamic stabilization The present disclosure relates to the field of implants used in spinal surgery, more specifically to a spinal implant for stabilizing adjacent first and second interspinous processes. Surgeries in the field of spinal surgery may involve the cervical (neck), thoracic spine, or more frequently, the lumbar region. Spinal stabilization devices may be used when there is instability, such as a vertebra slipping against an adjacent vertebra. Such spinal stabilization devices may include an intervertebral implant composed of a stabilization spacer, a flexible fabric braid-type strap, a movable assembly, and a locking member. The stabilization spacer is intended to be positioned between the spinous processes of two consecutive, i.e., adjacent vertebrae to be stabilized. The flexible strap (e.g., fabric braid) surrounds the vertebral processes. The movable assembly is configured to engage with the stabilization spacer to lock the flexible strap in place against the stabilization spacer. This is achieved by threading the flexible strap between the movable assembly and the stabilization spacer. The locking member (e.g., a screw) is configured to lock the flexible strap by locking the connection between the movable assembly and the stabilization spacer. An example of such an implant can be found, for instance, in EP 1009311 B1. In the device of EP 1009311, a spacer is fitted with a flexible strap that forms a loop. The flexible strap is locked by a quarter-swivel rotary latch that can be operated inside the spacer. However, this device does not guarantee accurate locking of the flexible strap, especially when the rotary latch is a flat strap that can slide and pivot, because the rotary latch is not properly secured in the locking position. Another example of an intervertebral implant is described in FR 3047657 A1 filed in the name of the present applicant. In this device, an implant is described comprising a stabilizing spacer configured to be fixed between the spinous processes of a vertebra to stabilize at least two adjacent vertebrae together. The spacer comprises a recess having a longitudinal axis and radially accommodates at least a portion of a flexible strap on at least one side of the recess. The flexible strap secures the stabilizing spacer to the spinous process of the vertebra to be stabilized. The implant comprises a blocking pin having a profile substantially complementary to the longitudinal axis and the shape of the recess. The blocking pin is designed to be displaced along the longitudinal axis within the recess and locks the strap by inserting it between the blocking pin and the inner wall of the recess. This device also includes a locking screw coaxial with the blocking pin. The locking screw must be inserted into the recess after the flexible strap has already been positioned in the recess. Additional features, details, and benefits will become clear through the detailed description below and the analysis of the attached drawings. FIG. 1a shows an exploded perspective view of an implant according to various embodiments of the present disclosure. Figure 1b shows a front view of the implant of Figure 1a in the locking position. Figure 1c shows a front view of the implant of Figure 1a in the unlocked position. Figure 2 shows a side view of the implant of Figure 1a. Figure 3 shows a side cross-sectional view of the implant of Figure 1a in the unlocked position. Figure 4 shows a side cross-sectional view of the implant of Figure 1a in the locking position. Figure 5 shows a side cross-sectional view of the implant of Figure 1a in the release position. Figure 6 shows a cross-sectional view of the implant of Figure 1a in the locking position. Now, specific embodiments illustrated in the accompanying drawings will be referred to in detail. In the following detailed description, many specific details are provided to provide a thorough understanding. However, those skilled in the art will understand that the embodiments can be practiced without these specific details. In other cases, known methods, procedures, and/or components have not been described in detail to avoid unnecessarily obscuring the aspects of the embodiments. Now, refer to FIG. 1a, which illustrates an intervertebral implant (5) for dynamic spinal stabilization, more specifically for stabilizing adjacent first and second spinous processes (not shown in FIG. 1a but shown in FIG. 1b). According to this embodiment, the implant (5) comprises a spacer (10), a rotational latch (20), and a strap (50) (shown by a dashed line). According to some embodiments, the spacer (10) may be formed of a biocompatible polymer such as PEEK, and the latch (20) may be formed of stainless steel or titanium. The spacer (10) includes a first surface (11) on the opposite side of a second surface (12) (e.g., best illustrated in FIG. 2). Additionally, the spacer (10) has a latch housing wall (16) (e.g., also illustrated in FIG. 5) th