A breakable mortise and tenon structure orthopedic plate system and non-thermal trigger separation method

Abstract

This invention belongs to the field of medical device technology and provides a fractureable mortise and tenon structure orthopedic steel plate system and a non-thermal triggered separation method. This invention uses external mechanical vibration to target the brittle ceramic layer, inducing fatigue fracture and achieving separation from the magnesium alloy pins. This results in the loss of the original mortise and tenon structure, causing the two steel plates to separate and lose their original mechanical properties. This invention solves the problem of traditional internal fixation plates requiring a second surgery for removal and has the advantages of no thermal damage, precise triggering, and good biocompatibility.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a fractureable tenon-and-mortise structure orthopedic steel plate system and a non-thermal-triggered separation method. Background Technology

[0002] Currently, orthopedic plates are commonly used internal fixation devices in orthopedic surgery, mainly used to fix and support fracture segments and help the fracture site heal. Traditional one-piece orthopedic plates often require a second surgery to remove after bone healing, which can cause secondary damage to the patient's already healed soft and bone tissues. This not only increases the patient's pain and treatment costs, but may also lead to complications such as postoperative infection and incisional hernia. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a fracture-resistant tenon-and-mortise structure orthopedic steel plate system and a non-thermally triggered separation method, thereby resolving the issues in the prior art. The technical solution adopted by this invention is as follows: A fractured tenon-and-mortise orthopedic plate system includes pins and two separate plates; A brittle ceramic layer is provided at the four corners of both ends of the pin, and the brittle ceramic layer at both ends of the pin forms a dovetail tenon structure. One end of each of the two separate steel plates is provided with a dovetail groove that is compatible with the dovetail tenon structure. The pin is used to engage with the dovetail grooves of the two split steel plates through the dovetail tenon structure at both ends, thereby connecting the two split steel plates. The homogeneous brittle ceramic layer is designed to fracture under targeted external mechanical vibration, thereby separating the two separate steel plates.

[0004] Furthermore, the pin is a Mg alloy pin.

[0005] A non-thermally triggered separation method for fractured tenon-and-mortise orthopedic steel plates includes the following steps: S1: Implantable fracture-resistant mortise and tenon structure orthopedic plate system, two separate plates connected to pins via dovetail tenons and dovetail grooves; S2: After bone healing, high-frequency mechanical vibration of 20-50kHz is applied in vitro. The mechanical vibration is transmitted to the brittle ceramic layer and causes resonance fracture. S3: After the brittle ceramic layer fractures, the two separate steel plates separate under physiological load.

[0006] The present invention has the following beneficial effects: This invention designs a split steel plate structure with mortise and tenon joints, using a brittle ceramic layer as the weak structure that triggers fracture. Compared with traditional one-piece steel plates, it can be removed with only a minimally invasive surgery later, without the need for secondary incision and exposure, which greatly reduces secondary damage to the patient's tissues and reduces patient pain and treatment complications. Attached Figure Description

[0007] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a schematic diagram of an automatic detection device for geometric defects in blades. Detailed Implementation

[0008] The following will be described in conjunction with embodiments of the present invention. Figures 1-2 The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0009] This invention proposes a fractured tenon-and-mortise orthopedic plate system, comprising a pin and two separate plates; A brittle ceramic layer is provided at the four corners of both ends of the pin, and the brittle ceramic layer at both ends of the pin forms a dovetail tenon structure. One end of each of the two separate steel plates is provided with a dovetail groove that is compatible with the dovetail tenon structure. The pin is used to engage with the dovetail grooves of the two split steel plates through the dovetail tenon structure at both ends, thereby connecting the two split steel plates. The homogeneous brittle ceramic layer is designed to fracture under targeted external mechanical vibration, thereby separating the two separate steel plates.

[0010] like Figure 1 The pin includes a base, marked E, and four brittle ceramic layers, namely A, B, C, and D, are set at the four ends of the base E. Each brittle ceramic layer is a wedge-shaped structure, and the two brittle ceramic layers at the ends of the base E together form a dovetail structure.

[0011] This invention utilizes external high-frequency mechanical vibration to target a brittle ceramic layer, inducing fatigue fracture and separating it from the magnesium alloy pin. This results in the loss of the original tenon-and-mortise structure, causing the two steel plates to separate and lose their original mechanical properties. This invention solves the problem of traditional internal fixation plates requiring a second surgery for removal and offers advantages such as no thermal damage, precise triggering, and good biocompatibility.

[0012] Furthermore, the pin is a Mg alloy pin. The brittle ceramic layer can be made of Al2O3 short fiber reinforced PEEK composite material, with a fiber volume fraction of 30-50%.

[0013] A non-thermally triggered separation method for fractured tenon-and-mortise orthopedic steel plates includes the following steps: S1: Implantable fracture-resistant mortise and tenon structure orthopedic plate system, two separate plates connected to pins via dovetail tenons and dovetail grooves; S2: After bone healing, high-frequency mechanical vibration of 20-50kHz is applied in vitro. The mechanical vibration is transmitted to the brittle ceramic layer and causes resonance fracture. The amplitude of the high-frequency vibration is 20-100kHz and the duration is 1-10 minutes. In addition, the human body is more sensitive to low-frequency vibration and less sensitive to high-frequency vibration, especially the ultrasound frequency band greater than 20kHz: it usually does not directly cause pain.

[0014] S3: After the brittle ceramic layer fractures, the two separate steel plates separate under physiological load.

[0015] Finally, the separated steel plate and pin fragments were removed through a minimally invasive incision.

[0016] In this invention, the brittle fracture layer can be pre-programmed with a crack-guiding structure, causing it to undergo controllable segmental fracture under vibration, forming macroscopic fragments that can be grasped by surgical instruments. The fractured pin fragments are then removed through the original locking channel or minimally invasive channel, under visual or image-guided conditions using grasping instruments or negative pressure devices.

[0017] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, alterations, or substitutions made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A fracture-resistant tenon-and-mortise structure orthopedic steel plate system, characterized in that, Includes a pin and two separate steel plates; A brittle ceramic layer is provided at the four corners of both ends of the pin, and the brittle ceramic layer at both ends of the pin forms a dovetail joint structure. One end of each of the two separate steel plates is provided with a dovetail groove that is compatible with the dovetail tenon structure. The pin is used to engage with the dovetail grooves of the two split steel plates through the dovetail tenon structure at both ends, thereby connecting the two split steel plates. The homogeneous brittle ceramic layer is designed to fracture under targeted external mechanical vibration, thereby separating the two separate steel plates.

2. The fracture-resistant tenon-and-mortise structure orthopedic plate system according to claim 1, characterized in that, The pin is a Mg alloy pin.

3. A non-thermally triggered separation method for a fractured mortise and tenon joint orthopedic plate, based on the fractured mortise and tenon joint orthopedic plate system of claim 1, characterized in that, Includes the following steps: S1: Implantable fracture-resistant mortise and tenon structure orthopedic plate system, two separate plates connected to pins via dovetail tenons and dovetail grooves; S2: After bone healing, high-frequency mechanical vibration of 20-50kHz is applied in vitro. The mechanical vibration is transmitted to the brittle ceramic layer and causes resonance fracture. S3: After the brittle ceramic layer fractures, the two separate steel plates separate under physiological load.

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