A thermoplastic absorbable fracture fixation material

Abstract

The present invention relates to an absorbable fracture fixation material thermoplastic device, comprising a cylindrical conveying chamber, a rotating shaft axially connected to the conveying chamber, a spiral conveying sheet fixedly connected to the rotating shaft, and a motor driving the rotating shaft to rotate, wherein the spiral conveying sheet is fixedly connected with an elastic rubber strip that fits the inner wall of the conveying chamber along the outer edge, the liquid inlet and liquid outlet sides of the conveying chamber are respectively provided with a liquid inlet and a liquid outlet, the liquid outlet is provided with an injection tube, the diameter of one end of the conveying chamber close to the liquid outlet becomes smaller, a heating chamber connected to the liquid inlet is provided above the conveying chamber, a heating tube is provided in the heating chamber, and a heat preservation heating sheet is provided on the outer wall of the conveying chamber, by placing the material to be heated in the heating chamber and heating it through the heating tube, the melted material flows into the conveying chamber through the liquid inlet, is cooled to the glass transition temperature in the conveying chamber, and finally is driven by the spiral conveying sheet to be conveyed toward the liquid outlet and flows out from the injection tube.

Description

Technical Field

[0001] The invention relates to the field of fluid transport, in particular to an absorbable fracture fixation material thermoplastic device. Background Art

[0002] PLGA (polylactic acid-glycolic acid copolymer) is a biodegradable functional polymer organic compound formed by random polymerization of two monomers, lactic acid and glycolic acid, with good biocompatibility, non-toxicity, and good capsule and film-forming properties. The degradation products of PLGA are lactic acid and glycolic acid, which are also by-products of human metabolic pathways. Therefore, when it is used in medicine and biomaterials, it will not have toxic side effects. Therefore, it is widely used in the biomedical field, such as surgical sutures, fracture internal fixation materials, tissue repair materials, etc. Its glass transition temperature is between 40-70 °C, and its melting point is between 135~200 °C. In fracture internal fixation surgery, the heated and vitrified PLGA needs to be injected into the interior of the fracture site. Summary of the invention

[0003] The invention aims at the deficiencies of the prior art and provides a safe, reliable and easy-to-operate absorbable fracture fixation material thermoplastic device.

[0004] The present invention is achieved through the following technical scheme, which provides an absorbable fracture fixation material thermoplastic device, including a cylindrical conveying chamber, a rotating shaft axially connected to the inside of the conveying chamber, a spiral conveying sheet fixedly connected to the rotating shaft, and a motor driving the rotating shaft to rotate, wherein the spiral conveying sheet is fixedly connected to an elastic rubber strip that fits the inner wall of the conveying chamber along the outer edge, the liquid inlet and liquid outlet sides of the conveying chamber are respectively provided with a liquid inlet and a liquid outlet, an injection tube is installed on the liquid outlet, the diameter of one end of the conveying chamber close to the liquid outlet becomes smaller, a heating chamber connected to the liquid inlet is installed above the conveying chamber, a heating tube is installed in the heating chamber, and a heat preservation heating sheet is installed on the outer wall of the conveying chamber.

[0005] The material to be heated is placed in the heating chamber and heated by the heating tube. The melted material flows into the conveying chamber through the liquid inlet, is cooled to the glass transition temperature in the conveying chamber, and is maintained at the glass transition temperature by the heat-insulating heating plate. Finally, the material is driven by the spiral conveying plate to be conveyed toward the liquid outlet and flows out of the injection tube. The elastic rubber strip can seal the spiral conveying plate and the inner wall of the conveying chamber, and can also support the spiral conveying plate.

[0006] As an optimization, a groove is provided on the end surface of the outer edge of the spiral conveyor sheet along the length direction, and the elastic rubber strip is fixedly connected to both sides of the spiral conveyor sheet and extends into the groove. The groove provided in this solution can increase the contact area between the elastic rubber strip and the spiral conveyor sheet, and increase the fixing strength between the elastic rubber strip and the spiral conveyor sheet.

[0007] As an optimization, a shell is installed outside the delivery chamber to wrap the delivery chamber and the heat preservation and heating plate. An inner temperature sensor is installed near the liquid outlet in the shell, and an outer temperature sensor is installed away from the liquid outlet and the heat preservation and heating plate in the shell. The shell in this solution plays a role of heat insulation and can prevent the heat preservation and heating plate from scalding the operator. The inner temperature sensor is used to detect the temperature at the liquid outlet, and the outer temperature sensor is used to detect the lowest temperature in the shell.

[0008] As an optimization, the injection tube is connected to the liquid outlet through a thread, and an elastic bending portion is provided on the injection tube, and a spring is sleeved on the elastic bending portion. The elastic bending portion in this solution can prevent the vibration of the thermoplasticizer from being transmitted to the end of the injection tube, and can also be used to change the angle between the end of the injection tube and the delivery chamber for easy operation, and the spring is used to protect the elastic bending portion.

[0009] As an optimization, the liquid inlet is connected to the bottom of the heating chamber, and a solenoid valve is installed on the liquid inlet. The liquid inlet is connected to the bottom of the heating chamber, so that the liquid in the heating chamber flows into the conveying chamber from the liquid inlet, and the solenoid valve is used to control the switch of the liquid inlet.

[0010] As an optimization, the heating tube is spiral and has two layers, the upper and lower layers. The heating tube is spiral and has two layers, which is convenient for heating the material in the heating chamber.

[0011] As an optimization, a baffle is fixed to the bottom surface of each layer of heating tubes, and a plurality of drip holes are opened on the baffle, and the drip holes on the upper baffle and the lower baffle are arranged in a staggered manner, and the heating tube and the baffle are provided with rounded corners at the joint. The baffle in this scheme is used to receive solid materials, and the melted materials fall from the drip holes. The drip holes on the upper baffle and the lower baffle are arranged in a staggered manner to prevent the solid materials from falling into the liquid inlet, and the heating tube and the baffle are provided with rounded corners at the joint to prevent the materials from accumulating in the gap between the heating tube and the baffle.

[0012] As an optimization, an irradiation lamp is installed on the end surface of the housing close to the injection tube. The irradiation lamp in this solution is used to illuminate the operating part during operation.

[0013] The beneficial effects of the present invention are as follows: the absorbable fracture fixation material thermoplastic device of the present invention places the material to be heated in the heating chamber and heats it through the heating tube. The melted material flows into the conveying chamber through the liquid inlet, is cooled to the glass transition temperature in the conveying chamber, and finally is driven by the spiral conveying sheet to convey the material toward the liquid outlet and flows out of the injection tube. The device can prevent solid materials from being injected into the body and is safe, reliable and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the injection tube structure of the present invention;

[0016] Figure 3 It is a cross-sectional view of the AA surface of the present invention;

[0017] Figure 4 It is a cross-sectional view of the BB surface of the present invention;

[0018] Figure 5 It is a cross-sectional view of the CC surface of the spiral conveyor sheet of the present invention;

[0019] As shown in the figure:

[0020] 1. Conveying chamber, 2. Screw conveying plate, 3. Rotating shaft, 4. Insulating heating plate, 5. Liquid outlet, 6. Liquid inlet, 7. Shell, 8. Injection tube, 9. Motor, 10. Sealing ring, 11. Inner temperature sensor, 12. Outer temperature sensor, 13. Irradiation lamp, 14. Solenoid valve, 15. Heating chamber, 16. Heating tube, 17. Baffle, 18. Feeding port, 19. Switch, 20. Elastic rubber strip, 801, Elastic bending part, 802, Spring. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0022] like Figures 1 to 5 As shown, an absorbable fracture fixation material thermoplastic device of the present invention includes a cylindrical conveying chamber 1, a rotating shaft 3 axially connected to the inside of the conveying chamber 1, a spiral conveying sheet 2 fixedly connected to the rotating shaft 3, and a motor 9 for driving the rotating shaft 3 to rotate, the spiral conveying sheet 2 is fixedly connected to an elastic rubber strip 20 that fits the inner wall of the conveying chamber 1 along the outer edge, and a sink groove is opened on the end face of the outer edge of the spiral conveying sheet 2 along the length direction, and the elastic rubber strip 20 is fixedly connected to both sides of the spiral conveying sheet 2 and extends into the sink groove.

[0023] The motor 9 is a reduction motor with an output speed of 10 to 60 rpm. The motor 9 is installed outside the conveying chamber 1 and is arranged at one end on the liquid inlet side. The rotating shaft 3 extends out of the conveying chamber 1 and is fixedly connected to the motor shaft. A sealing ring 10 is installed at the position where the rotating shaft 3 passes through the conveying chamber 1. A motor cover is installed outside the motor, and a switch 19 for controlling the motor is installed on the motor cover.

[0024] The liquid inlet side and the liquid outlet side of the conveying chamber 1 are respectively provided with a liquid inlet 6 and a liquid outlet 5. The liquid inlet 6 is arranged on the side of the liquid inlet side. The liquid inlet 6 is equipped with a solenoid valve 14, which is switched synchronously with the motor 9.

[0025] An injection tube 8 is installed on the liquid outlet 5, and the injection tube 8 is connected to the liquid outlet 5 through a thread. An elastic bending portion 801 is provided on the injection tube 8, and the elastic bending portion 801 is a silicone tube. A spring 802 is sleeved on the elastic bending portion 801. The diameter of the end of the conveying chamber 1 close to the liquid outlet 5 becomes smaller, and the outer diameter of the spiral conveying sheet becomes smaller synchronously.

[0026] A heating chamber 15 connected to the liquid inlet 6 is arranged above the conveying chamber 1, and the liquid inlet 6 is connected to the bottom of the heating chamber 15. A heating tube 16 is arranged in the heating chamber 15. A feed port 18 is arranged at the top of the heating chamber 15. An insulating layer is arranged outside the heating chamber 15 to prevent scalding of the operator.

[0027] An observation hole is vertically arranged on the heating chamber 15 , and a transparent glass plate is installed on the observation hole, which can be used to observe the residual amount of liquid inside the heating chamber 15 .

[0028] The heating tube 16 is spiral and has two layers, each layer of the heating tube 16 has a baffle 17 fixedly connected to its bottom surface, the baffle 17 has a plurality of drip holes, and the drip holes on the upper baffle 17 and the lower baffle 17 are arranged alternately, and a rounded corner is provided at the joint between the heating tube 16 and the baffle 17.

[0029] The outer wall of the conveying chamber 1 is provided with a heat preservation heating plate 4 .

[0030] A shell 7 is installed on the outside of the conveying chamber 1 to wrap the conveying chamber 1 and the thermal insulation heating plate 4. An inner temperature sensor 11 is installed near the liquid outlet 5 in the shell 7, and an outer temperature sensor 12 is installed in the shell away from the liquid outlet 5 and the thermal insulation heating plate 4. An irradiation lamp 13 is installed on the end face of the shell near the injection tube 8.

[0031] The method of using the present invention is as follows: when in use, a certain amount of solid material is placed in the heating chamber 15 through the feed port 18, the power is turned on, the heating tube 16 melts the material and flows it to the bottom of the heating chamber 15, after the material is completely melted, the solenoid valve 14 is opened, the melted material flows into the conveying chamber 1, and is allowed to stand for a certain period of time to cool the material in the conveying chamber 1 to 50-60 degrees, and then the heat preservation heating plate 4 is started to heat and keep the conveying chamber 1 warm.

[0032] Insert the end of the injection tube 8 into the position where injection is required, turn on the switch 19, and the motor 9 drives the spiral conveying plate 2 to rotate, convey the material toward the liquid outlet 5, and inject it from the injection tube 8 to the position where injection is required. The heat preservation heating plate 4 insulates the conveying chamber 1 to keep the liquid temperature in the conveying chamber 1 at the glass transition temperature of 50 to 60 degrees.

[0033] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An absorbable fracture fixation material thermoplastic device, characterized in that: The invention comprises a cylindrical conveying chamber (1), a rotating shaft (3) axially connected to the inside of the conveying chamber (1), a spiral conveying sheet (2) fixedly connected to the rotating shaft (3), and a motor (9) for driving the rotating shaft (3) to rotate, wherein the spiral conveying sheet (2) is fixedly connected to an elastic rubber strip (20) along the outer edge thereof and in contact with the inner wall of the conveying chamber (1), a groove is formed on the end surface of the outer edge of the spiral conveying sheet (2) along the length direction, and the elastic rubber strip (20) is fixedly connected to both sides of the spiral conveying sheet (2) and extends into the groove; the liquid inlet side and the liquid outlet side of the conveying chamber (1) are respectively provided with a liquid inlet (6) and a liquid outlet (5), and the liquid outlet (5) is provided with an injection tube (8), the diameter of one end of the conveying chamber (1) close to the liquid outlet (5) becomes smaller, a heating chamber (15) connected to the liquid inlet (6) is arranged above the conveying chamber (1), a heating tube (16) is arranged in the heating chamber (15), and a heat preservation heating plate (4) is arranged on the outer wall of the conveying chamber (1); the heating tube (16) is spiral and has two layers, upper and lower; a baffle (17) is fixedly connected to the bottom surface of each layer of the heating tube (16), a plurality of drip holes are opened on the baffle (17), and the drip holes on the upper baffle (17) and the lower baffle (17) are arranged in a staggered manner, and a rounded corner is arranged at the joint between the heating tube (16) and the baffle (17).

2. The absorbable fracture fixation material thermoplastic device according to claim 1, characterized in that: A shell (7) is installed outside the conveying chamber (1) and encloses the conveying chamber (1) and the heat-insulating heating plate (4); an inner temperature sensor (11) is installed at a position close to the liquid outlet (5) in the shell (7); and an outer temperature sensor (12) is installed at a position away from the liquid outlet (5) and the heat-insulating heating plate (4) in the shell.

3. The absorbable fracture fixation material thermoplastic device according to claim 1, characterized in that: The injection tube (8) is connected to the liquid outlet (5) via a thread, and an elastic bending portion (801) is provided on the injection tube (8), and a spring (802) is sleeved on the elastic bending portion (801).

4. The absorbable fracture fixation material thermoplastic device according to claim 1, characterized in that: The liquid inlet (6) is connected to the bottom of the heating chamber (15), and a solenoid valve (14) is installed on the liquid inlet (6).

5. The absorbable fracture fixation material thermoplastic device according to claim 2, characterized in that: An irradiation lamp (13) is mounted on the end surface of the housing close to the injection tube (8).

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