CN219250383U - Memory alloy finger metacarpal bone internal fixer - Google Patents

Abstract

The utility model belongs to the technical field of orthopedic internal fixation medical instruments, and particularly relates to a memory alloy metacarpal bone internal fixator. The two-end encircling arm type lifting device comprises a ridge plate and encircling arms, wherein 2-6 pairs of encircling arms are radially arranged along the ridge plate, the encircling arms arranged at two end parts of the ridge plate are vertically arranged with the ridge plate, and the encircling arms between the encircling arms at two end parts of the central part of the ridge plate are obliquely arranged. The fixer comprises a ridge plate, an encircling arm and a pressurizing arm; the encircling arm is mainly used for encircling the metacarpal bones of the fingers and plays a role in restraining the fractured metacarpals of the fingers together in the axial direction; the compression arm is axially compressed to the fracture axis through the two axial ends to promote quick healing of the fracture axis, a Kirschner wire is required to be used for drilling holes at the corresponding positions of the metacarpal compression arm during installation, and the compression arm is implanted into the corresponding holes after being expanded in an ice-water mixture to deform the compression arm, so that a better fixing and compression effect is achieved.

Description

Memory alloy finger metacarpal bone internal fixer

Technical Field

The utility model belongs to the technical field of orthopedic internal fixation medical instruments, and particularly relates to a medical device for dislocation or fracture of phalanges and metacarpals, which is made of a titanium-nickel shape memory alloy material.

Background

The fracture of the metacarpal bones is a common fracture type in hand injuries, and the intra-operative fixation treatment can restore good anatomical alignment and promote early movement of the fracture and restore the functions of the hand.

The traditional treatment mode for the fracture is to assist external fixation such as phalangeal splints or plaster supports on the basis of manual reduction, but the method has the determination that the fracture part is fixed inaccurately, free fracture blocks are not effectively pressurized, the interphalangeal joints are easily affected after the fixation time is too long, and the like. Another treatment method is to clinically fix the fracture of the metacarpal bone by using a metacarpal bone plate, incise the skin of the fracture part in the operation process, and in order to reduce the wound area and achieve the purpose of minimally invasive, usually incise a smaller wound on the skin, insert the required metacarpal bone plate, then fix by using a matched bone screw, which has great damage to the human body and longer operation time.

The prior art discloses a encircling structure for fracture of metacarpal bones, metatarsal bones and digits of orthopaedics, and application (patent) number: CN202020578113.0, filing date: 2020.04.17, grant bulletin number: CN213075872U, comprising: the steel plate body is a strip-shaped plate body with a smooth arc-shaped section, a plurality of fixing strips are arranged on two sides of the steel plate body, the free ends of the fixing strips face the same direction, a plurality of screw holes are formed in the steel plate body and the fixing strips, and the screws penetrate through the screw holes to fix the steel plate body and bones. The utility model discloses a hand and foot metacarpal bone, metatarsal bone and phalangeal bone fracture encircling structure which can effectively reposition the hand and foot metacarpal bone, metatarsal bone and phalangeal bone fracture. However, the hands and feet are important movement organs of the human body, and the problem that the encircling structure is not firm in actual application and certain in falling off exists, so that the later use is affected, and the subsequent rehabilitation and treatment effects are seriously affected.

Disclosure of Invention

The utility model aims at solving the problems in the prior art, fully utilizes the shape deformation-restorable characteristic of the memory alloy, and provides the memory alloy metacarpal bone fixator which has simple process modeling, is easy to deform and put in, is stable to install after being subjected to the restoration and can be continuously pressurized to heal fracture lines.

The memory alloy finger metacarpal bone fixator of the utility model adopts the integral type: a memory alloy finger metacarpal bone fixer comprises a plurality of pairs of encircling arms in the radial direction, pressing arms on two axial sides, and a main body ridge plate of the fixer.

The memory alloy finger metacarpal bone fixator provided by the utility model is provided with a plurality of pairs of encircling arms which are radially distributed, the number of pairs of encircling arms is 2-6, each middle encircling arm is conical, the conical angle is 3-15 degrees, when the conical angle is close to 3 degrees, the length change from a ridge plate to the farthest end of the encircling arm is smaller, the encircling arm width is thicker, and the encircling force mechanical property is better; on the contrary, when the taper angle is close to 15 degrees, the length change from the ridge plate to the most distal end of the encircling arm is larger, the encircling arm is narrower in width, the encircling force mechanical property is weak, but the implantation is easy during operation; the minimum width is not less than 1mm; each encircling arm at the two ends is parallel and perpendicular to the ridge plate. The 2 pairs of encircling arms are most suitable for internal fixation of phalangeal fracture, and the 6 pairs of encircling arms are most suitable for internal fixation of metacarpal fracture or near interphalangeal fracture.

The memory alloy finger metacarpal bone fixator of the utility model is provided with 2 pairs of pressurizing arms, the two ends are axially distributed, the width is 1-3 mm, and the memory alloy finger metacarpal bone fixator is folded inwards by 70-85 degrees towards the axial center position; the product with the inward fold of 70 degrees is suitable for the affected bones with the broken lines of 10mm, and the product with the inward fold of 85 degrees is suitable for the affected bones with the broken lines of less than 10 mm; because of different inclination angles, the applied pressure is different, the axial pressurization effect is achieved, and the healing of fracture lines is promoted.

The memory alloy finger metacarpal bone fixator is manufactured by adopting the titanium-nickel memory alloy plate, and the titanium-nickel memory alloy has the excellent characteristics of corrosion resistance, wear resistance, high damping, super elasticity and the like.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a left side view of the present utility model;

wherein: 1. a spine panel; 2. encircling the arm; 3. a pressing arm.

Detailed Description

The memory alloy refers to a metacarpal bone internal fixator which is characterized by comprising a spine plate 1 and encircling arms 2, wherein 2-6 pairs of encircling arms 2 are radially arranged along the spine plate 1, the encircling arms 2 arranged at two ends of the spine plate 1 are vertically arranged with the spine plate 1, the end encircling arms 2 are vertically arranged to facilitate observation and positioning in operation, the encircling arms 2 between the encircling arms 2 at two ends of the center part of the spine plate 1 are obliquely arranged, the encircling arm fixing strength is improved, and loosening or falling caused by palm movement in the later recovery period of operation installation equipment is prevented.

The encircling arm 2 is conical, the root of the encircling arm is conical from the tip to the root of the encircling arm, and the conical angle is 3-15 degrees. One side arm of the encircling arm 2 arranged at the two ends of the ridge plate 1 is vertically arranged with the ridge plate 1, and the side arm of the encircling arm 2 arranged at the two ends of the ridge plate 1 can be used as a reference surface in operation, so that the installation reference position can be easily observed and confirmed in operation. The other side arm is arranged at a conical angle with the ridge plate 1, the encircling arms 2 between the encircling arms 2 at the two ends of the central part of the ridge plate 1 are obliquely arranged, so that multipoint stress is effectively realized, and meanwhile, the multidirectional oblique arrangement of the encircling arms 2 effectively realizes moment locking and improves the fixing strength.

The device also comprises a pressurizing arm 3, wherein the pressurizing arm 3 is positioned at the side part of the ridge plate 1, the width is 1-3 mm, and the pressurizing arm is folded inwards by 70-85 degrees towards the axial center position. The pressurizing arms 3 are inwards folded through two side ends to apply force to effectively lock the axial displacement of the ridge plate 1, the pressurizing arms 3 are conical, the root parts of the encircling arms are conical angles to the tip parts, the conical angles are 3-15 degrees, and the installation firmness is improved.

The following is a supplementary explanation in connection with the specific embodiment: the utility model is described in further detail below with reference to the examples of the drawings.

1. The memory alloy finger/palm bone fixer consists of a ridge plate, an encircling arm and a pressurizing arm.

2. As shown, a memory alloy metacarpal bone fixator includes a spine, embracing arms, and pressing arms; the encircling arm is mainly used for encircling the metacarpal bones of the fingers and plays a role in restraining the fractured metacarpals of the fingers together in the axial direction; the compression arm is axially compressed to the fracture axis through the two axial ends to promote quick healing of the fracture axis, a Kirschner wire is required to be used for drilling holes at the corresponding positions of the metacarpal compression arm during installation, and the compression arm is implanted into the corresponding holes after being expanded in an ice-water mixture to deform the compression arm, so that a better fixing and compression effect is achieved.

3. The utility model is used for solving the problem of minimally invasive surgery for dislocation of metacarpal bones or internal fixation of fracture, designs a plurality of middle specifications of different models according to the size of affected bones of patients, and selects a fixer with proper specification for installation in the surgery for dislocation of phalanges, metacarpals or near interphalangeal bones or fracture. Firstly, sterilizing the product by high-temperature high-pressure steam, then placing the product in sterile ice brine at 0-5 ℃ for 3-5 minutes, fully cooling the product, and then using a spreading clamp to spread each encircling arm and each pressurizing arm in the ice brine, so that the opening of each encircling arm is slightly larger than the diameter of a bone. During installation, holes are drilled at corresponding positions of the metacarpal and metacarpal bone pressurizing arms, then the encircling arms of the shaped memory alloy metacarpal and metacarpal bone fixator are implanted, the pressurizing arms are implanted into the corresponding holes, then the memory alloy metacarpal bone fixator is fomented by gauze soaked in hot salt water with the temperature of about 45 ℃, the memory alloy metacarpal bone fixator has a shape memory effect, and the encircling arms and the pressurizing arms are reset to firmly hold the metacarpal and metacarpal bone. The memory alloy refers to the shape memory effect of the metacarpal bone fixator at the body temperature of a human body, and the metacarpal bone fixator is restored to a shape customized for a patient when leaving a factory, so that the patient is continuously pressurized. And (5) suturing the incision, and completing the operation.

The fixator is integrally formed by TiNi material, has a shape memory function, has good biocompatibility, is safe, nontoxic and free of rejection after being implanted into a human body, is easy to deform and mount, is convenient to implant and take out in the operation process, shortens the operation time, has better treatment effect of the operation, and is easier to heal the affected bone.

Claims (5)

1. The memory alloy refers to a metacarpal bone internal fixator which is characterized by comprising a spine (1) and encircling arms (2), wherein 2-6 pairs of encircling arms (2) are radially arranged along the spine (1), the encircling arms (2) arranged at two ends of the spine (1) are vertically arranged with the spine (1), and the encircling arms (2) between the encircling arms (2) at two ends of the center part of the spine (1) are obliquely arranged.

2. The memory alloy intra-phalanx fixer according to claim 1, characterized in that the embracing arm (2) is tapered, the embracing arm root to tip is tapered angle, the tapered angle is 3 ° to 15 °.

3. The memory alloy intra-phalanx fixer according to claim 2, characterized in that one side arm of the encircling arms (2) arranged at two ends of the spine (1) is arranged perpendicular to the spine (1), and the other side arm is arranged at a taper angle with the spine (1).

4. The memory alloy metacarpal and phalangeal internal fixator of claim 1 further comprising a pressing arm (3), the pressing arm (3) being located at the side of the spine (1) and having a width of 1 to 3mm and being folded inward by 70 ° to 85 ° toward the axial center.

5. The memory alloy metacarpal and phalangeal internal fixator as claimed in claim 4 wherein the pressure arm (3) is tapered, embracing the arm root to tip at a taper angle of 3 ° to 15 °.

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