RU241116U1 - Surgical serrated hook for temporary retention of bone fragments - Google Patents

Abstract

The utility model relates to medical equipment, specifically to a surgical serrated hook for the temporary retention of bone fragments during repositioning. The surgical serrated hook for the temporary retention of bone fragments during repositioning is designed as a metal rod comprising an oval handle on one end and a hook curved at an angle of 45° to the rod axis on the other. The lower surface of the hook is convex, and the upper surface is flat. A row of transverse teeth 10 mm long is located on the convex surface of the hook. A row of transverse teeth 10 mm long is located on the flat surface of the hook. The rows of teeth are offset relative to each other along the length of the row. Use of the utility model ensures minimally invasiveness and atraumaticity with respect to vascular-nerve bundles and surrounding tissues, improving the outcome of the surgical treatment stage of patients. 2 fig.

Description

The utility model relates to medicine, namely to traumatology and orthopedics, and can be used in the complex surgical treatment of improperly consolidated fractures of the epiphyses and diaphyses of the bones of the upper and lower extremities.

Minimally invasive fracture reduction is known to be atraumatic, achieving high functional results early in treatment, and does not require additional access to the fracture site. A single-pronged hook and awl have a similar effect; however, these instruments tend to slip off the bone during reduction, risking damage to the vascular and nerve bundles and surrounding soft tissues.

A disposable surgical hook (Russian Federation Patent for Utility Model No. 165214, IPC A61 B17/02, published October 10, 2016) is known. It consists of a two-part housing and a removable C-shaped hook. The proximal end of the housing has three rounded projections located in the projection of the vertices of an isosceles triangle; and the removable C-shaped hook has three rounded grooves. This device can be used to displace tissue and perform surgeries with various surgical approaches. However, this device is not completely atraumatic with respect to surrounding soft tissues.

The objective of the utility model is to create a convenient tool that combines the process of capturing and controlling bone fragments during repositioning.

The technical result of the claimed solution is the achievement of minimally invasiveness and atraumaticity in relation to the vascular-nerve bundles and surrounding tissues, improving the outcome of the surgical treatment stage of patients.

This technical result is achieved by proposing a toothed device for the temporary retention of bone fragments during repositioning. The device consists of a curved metal rod with an oval handle on the proximal side and a hook on the distal side, curved at an angle of 45° to the rod's main axis. The hook's lower surface is convex, while the upper surface is flat. The flat surface of the hook contains a row of small transverse teeth, spaced 1 mm apart, extending 10 mm. The convex surface of the hook also contains a row of transverse teeth, extending 10 mm. The teeth in both rows are offset relative to each other along the row. This technical result is achieved through the use of toothed surfaces, which prevent the instrument from slipping off the bone surfaces, thereby enhancing the stability of the temporary fixation of fragments during repositioning.

The essence of the claimed utility model is explained by the drawings, where Fig. 1 shows a general view of the claimed toothed device for temporarily holding bone fragments in three planes: a - side view; b - front view; c - rear view. Fig. 2 - the working part of the instrument in an enlarged form.

The instrument is made in the form of a curved metal rod 1, with a solid metal oval handle with a ribbed surface 2 on the proximal side of the instrument, passing into the distal part of the instrument with a conical thickening 3, which is a curved hook 4 at an angle of 45° to the main plane of the instrument with a row of small transversely lying teeth along the flat surface 5 and on the opposite side on the bending line 6, shifted relative to each other along the length of the row.

The device is used as follows.

The distal end, containing a serrated surface, is inserted into the fracture zone beneath the bone fragment through the loosely formed callus at the site of the malunion fracture. Pressure exerted through the lever on the proximal end of the device aligns the fragments along their length and fracture axis and holds them in place until final fixation is achieved.

Example of device implementation

The toothed device for temporary fixation for temporary retention of bone fragments is a curved metal rod made of stainless steel, with a total length of 25 cm, containing on the proximal side a solid metal oval handle with a ribbed surface, 10 cm long and 3 cm in diameter with a cone difference from 3 cm to 0.5 cm, and on the distal side a rod, 0.5 cm in diameter, turning into a plate curved at the end at an angle of 45°, 3 cm long, 0.5 cm wide and 0.3 cm thick with 10 small transverse teeth, with a step of 0.1 cm along the flat surface and on the opposite side on the bending line.

The technical and economic effect of the proposed device is that it provides the possibility of repositioning in a minimally invasive and atraumatic manner, which helps to reduce the incidence of infectious complications and improve the treatment results for patients with this pathology.

CLINICAL CASE #1

Child M., 12 years old, was admitted to the Traumatology and Orthopedics Department #1 of the State Budgetary Institution of the Rostov Region "City Clinical Hospital #20" in Rostov-on-Don on August 18, 2025. He was diagnosed with a malunion fracture of the middle third of the right radius. History: the child was injured in the street - he fell on his right hand. First aid was provided on the day of admission - closed manual reduction, immobilization with a plaster cast. Control radiographs revealed secondary displacement with an overlap of the fragment along the width of the cortical layer and an angular displacement of 22°, the angle is open to the back. The surgery was performed under general anesthesia - closed reduction, intramedullary metal osteosynthesis using a surgical serrated hook for temporary hold of bone fragments without technical difficulties. The postoperative period was uneventful. The child was discharged on the fourth day. No late postoperative complications or sequelae were identified.

CLINICAL CASE #2

Child S., 7 years old, was admitted to the Traumatology and Orthopedics Department #1 of the State Budgetary Institution of the Rostov Region "City Clinical Hospital #20" in Rostov-on-Don on October 9, 2025. She was diagnosed with a malunion fracture of the middle third of both bones of the left forearm. Past medical history: the child was injured during a physical education lesson - she fell on her left hand. Initially, closed manual reduction was performed, immobilization with a plaster cast. Control radiographs revealed secondary displacement with an angular displacement of 24°, the angle was open outward. The surgery was performed under general anesthesia - closed reduction, intramedullary metal osteosynthesis using a surgical serrated hook for temporary hold of bone fragments without technical difficulties. The postoperative period was uneventful. The child was discharged on the 6th day. No remote postoperative complications or consequences were identified.

Claims (1)

A surgical toothed hook for temporary retention of bone fragments during repositioning, made in the form of a metal rod containing an oval handle on one side and a hook on the other side, bent at an angle of 45° to the axis of the rod, wherein the lower surface of the hook is convex, and the upper surface is flat, on the convex surface of the hook there is a row of transverse teeth with a length of 10 mm, on the flat surface of the hook there is a row of transverse teeth with a length of 10 mm, wherein the rows of teeth are offset relative to each other along the length of the row.