CN-115484883-B - Improved external fixing support

CN115484883BCN 115484883 BCN115484883 BCN 115484883BCN-115484883-B

Abstract

The present disclosure relates to an improved external fixation strut comprising an elongated body comprising first and second hollow tubular shafts, opposite connectors coupled to ends of the first or second shafts, respectively, and each comprising a ball joint, one shaft having an inner diameter slightly larger than an outer diameter of the other shaft for slidably receiving the other shaft inside in a telescoping manner, the first and second shafts of the strut being realized from synthetic radiolucent plastic material, clamping elements disposed near overlapping ends of the first and second shafts for providing a quick clamping action against telescoping sliding movement of the one shaft within the other shaft, manually operated fixation elements acting on the clamping elements for applying the quick clamping action, a sleeve disposed around a central portion of the strut where the first and second shafts overlap, and a clamping band surrounding the sleeve and comprising opposing and facing clamping portions connected by threaded connectors. Also disclosed is a fixation system comprising at least first and second fixation rings and/or at least one fixation arch interconnected by at least one of the above mentioned fixation struts.

Inventors

Danielle venturini
Andre Otoboni
Gianluca Milan
John David Ross Jr
Karen Devita Standfield
Mikhail Samkuk
Alexander Cherkashellon

Assignees

奥瑟菲克斯有限公司
德克萨斯苏格兰礼仪儿童医院

Dates

Publication Date: 20260512
Application Date: 20210318
Priority Date: 20200323

Claims (4)

1. An improved external fixation strut (200), comprising: -an elongated body comprising a first hollow tubular shaft (210) and a second hollow tubular shaft (220); -opposite connectors (201; 202) coupled to the end of the first hollow tubular shaft (210) or the end of the second hollow tubular shaft (220), respectively, and each comprising a ball-and-socket joint; -the second hollow tubular shaft (220) has an inner diameter slightly larger than the outer diameter of the first hollow tubular shaft (210) so as to house the first hollow tubular shaft (210) internally in a slidable telescopic manner; -the first hollow tubular shaft (210) and the second hollow tubular shaft (220) of the strut (200) are realized of synthetic radiolucent plastic material; -a gripping element, provided near the overlapping ends of the first hollow tubular shaft (210) and the second hollow tubular shaft (220), for providing a quick gripping action to prevent telescopic sliding of the first hollow tubular shaft (210) within the second hollow tubular shaft (220), the gripping element being a gripping band (204); -a manually operated securing element acting on the clamping element for applying the quick clamping action, the manually operated securing element being a threaded connection; Characterized by further comprising a sleeve (230) disposed around a central portion of the strut (200) where the first hollow tubular shaft (210) and the second hollow tubular shaft (220) overlap, and The clamping band (204) surrounds the sleeve and comprises opposite and facing clamping portions (205; 206), the clamping portions (205; 206) being connected by the threaded connection.
2. The improved external fixation post (200) of claim 1, wherein the threaded connection is a clamping bolt (260), the clamping bolt (260) passing through a through hole (211) of the clamping portion (205; 206) and being received within a nut (207).
3. The improved external fixation post (200) of claim 2, wherein the clamping bolt (260) has a head (261) coupled to a removable manual butterfly wrench (250).
4. The improved external fixation strut (200) of claim 2, wherein the sleeve (230) is configured with a first sleeve portion (225) having an inner diameter substantially corresponding to an outer diameter of the first hollow tubular shaft (210) and a second sleeve portion (235) having an inner diameter substantially corresponding to an outer diameter of the second hollow tubular shaft (220), the clamping band (204) surrounding the second sleeve portion (235).

Description

Improved external fixing support Background The present disclosure relates to an improved structure for external fixation systems and devices, and more particularly, to an improved external fixation strut. The invention is described in connection with external fixation means, in particular connecting struts and rods. In general, external fixation devices are commonly used in a variety of surgical procedures, including limb fractures, limb extension, and deformity correction. The procedure involves a rigid frame, including several rings or arches, placed externally around the limb and attached to the bone segments using wires and half pins (half pins) inserted into the bone segments and connected to the relevant parts of the external rigid frame. The rings of the rigid frame that are opposite each other are interconnected directly by threads and/or telescoping rods or in combination with a single-or multi-plane hinge, which enables the surgeon to adjust the position of the rings relative to each other longitudinally, rotationally, horizontally or angularly over a period of time. For example, in limb extension, bone is surgically divided into two sections, with wires and half-needles inserted into the bone sections above and below the bone surgical incision and attached to the loops of a rigid frame interconnected by struts or telescoping connection rods. For limb extension, the opposing rings are directly interconnected by at least three or four threads or telescoping rods, the length of which are periodically adjusted and a gradual longitudinal separation of the bone segments is achieved. The rigid frame is used to gradually longitudinally separate two bone segments over a period of time (e.g., one millimeter per day). This achieves a gradual bone formation in the gaps between the bone segments created by this separation technique. Once the desired amount of extension (e.g., 5-6 cm) is achieved, the external device is stabilized to a fixed position and left on the bone segments until the newly formed bone is fully mineralized (e.g., 3-6 months, depending on the pathological nature and amount of extension). Similarly, in deformity correction, bone is surgically divided into two sections (typically at the apex of the deformity), and then wires and half-needles are inserted into the bone sections above and below the bone surgical incision and attached to the ring of the rigid frame. In this case, the opposing rings of the rigid frame are also connected together by a threaded rod with an attachment hinge and an angle distractor for gradually angularly separating the two bone segments over a period of time. Prior Art One common fixation device is a circular metal structure known as an Ilizarov device. The Ilizarov device, when used for limb extension or deformity correction, consists of several rings or arches that are placed externally around the limb and attached to surgically isolated bone segments using wires and half-needles. For correction of angular deformities, the opposing rings of the Ilizarov device are connected by a pair of hinges that provide the axis of rotation for the bone segments and an angular distractor that progressively separates the two rings from the associated bone segments. Another common external fixation device is known as Taylor space scaffold (Taylor SPATIAL FRAME), which is a hexapod-type external fixation device based on the so-called Stewart platform, but has many of the components and features of the Ilizarov device. The taylor space scaffold includes two external fixation rings that are attached to the bone segments by wires and half-needles and are connected together by five or six telescoping struts with multi-planar hinges at both ends of the struts. Each strut may be lengthened or shortened as needed to pull the two interconnected ring segments toward each other or push them apart. Each leg of the taylor space frame has a threaded rod partially disposed within a hollow shaft that includes an adjustment nut that mates with the threaded rod. However, rapid or gradual adjustments of the strut length are time consuming and often require changing the strut to a longer one during treatment. Furthermore, if no external support or other stabilization mechanism is used to support the rest of the frame, replacement or removal of the struts of the taylor spatial scaffold during treatment is not possible, as if one is removed from the frame, the frame will become unstable and collapse. Other examples of such fixtures are commercially known as TrueLok and Sheffield, the last of which is shown in fig. 1, reference numeral 100. These solutions are often used to address bone trauma situations, and it is important for the surgeon to quickly reposition the fracture and examine the results of the reduction by radiography. Both of the above products enable the installation of a post that can be quickly connected to the corresponding ring, thereby quickly releasing the second ring relative to