A handheld high-efficiency in-situ dressing preparation device based on electrical field coupling

Abstract

This invention discloses a handheld, high-efficiency in-situ dressing preparation device based on electric field coupling, comprising: multiple air-guiding grooves uniformly formed along the circumference of the dressing end of an airflow guiding ring, with the air-guiding channels penetrating the airflow guiding ring; a nozzle positioned at the center of the dressing end of the airflow guiding ring; a turbine fan positioned at the end of the airflow guiding ring furthest from the nozzle; a front handle fixed to the bottom of the airflow guiding ring; a rear handle fixed to the bottom of the airflow guiding ring; and a material feeding assembly including: a syringe, a stepper screw motor, a clamping plate, and a push plate; the syringe is clamped within the clamping plate; the injection end of the syringe is connected to the nozzle; the push plate is threadedly connected to the lead screw of the stepper screw motor; and the positive terminal of a high-voltage power supply is connected to the nozzle via a wire. The device of this invention can improve the efficiency of electrospun fiber deposition, achieving efficient in-situ dressing preparation on the wound surface. Simultaneously, the device is lightweight, easy to use, and portable.

Description

Technical Field

[0001] This invention relates to the field of dressing device technology, and more specifically to a handheld, high-efficiency in-situ dressing preparation device based on electric field coupling. Background Technology

[0002] The skin, the largest organ in the human body, serves as a barrier between the body and the external environment. However, skin damage caused by various traumas or diseases seriously threatens human survival and health. Statistics show that globally, there are over 100 million surgical trauma cases annually, over 11 million burn patients, and more than 19 million external trauma cases. Regarding chronic trauma, there are 7.4 million patients with pressure ulcers globally each year, over 10 million with varicose ulcers, and as many as 13.2 million with diabetic complication ulcers annually. How to treat and repair skin damage caused by trauma, disease, large-area burns, ulcers, and skin diseases has always been a challenging problem for clinicians.

[0003] Dressings play a crucial role in wound treatment; however, existing dressings still face challenges in wound care. An ideal dressing should not only conform well to the wound but also provide a physical barrier to protect the wound from external contamination while maintaining good breathability and a moist environment to promote healing and reduce scarring. Furthermore, reducing the workload of frontline healthcare workers and improving patient comfort are also issues that should be considered in dressing development.

[0004] Recently, a method for directly depositing micro / nanofibers in situ on wound surfaces using a handheld electrospinning system has been proposed and applied in wound treatment experiments. This system, based on electrohydrodynamics, constructs a stable and controllable spatial electric field between the instrument and the wound. It utilizes charge accumulation and repulsion within the material to form a jet, transferring the material from the instrument to the wound surface and driving it to form a dressing at the wound site in submicron to millimeter-scale fiber morphology. The in-situ prepared dressing, due to its material properties, the structural characteristics resulting from the forming process, and electrostatic adsorption, can achieve excellent adhesion to wound tissue, making it more suitable for treating complex, uneven wounds compared to ordinary dressings. Its microstructure features a large specific surface area and high porosity, providing excellent breathability and softness, effectively improving the patient's treatment experience. However, the low forming efficiency of the handheld electrospinning system has become a major bottleneck restricting the application of this technology in wound treatment, especially in battlefield rescue, wilderness first aid, and large-area wound treatment scenarios.

[0005] Therefore, developing a handheld, high-efficiency in-situ dressing preparation device based on electric field coupling is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a handheld, high-efficiency in-situ dressing preparation device based on electric field coupling, which has high dressing preparation efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A handheld, high-efficiency in-situ dressing preparation device based on electric field coupling, comprising:

[0009] An airflow guide ring, wherein multiple air guide grooves are evenly provided on the dressing end of the airflow guide ring along the circumferential direction, and the air guide grooves extend into the interior of the airflow guide ring to form an air guide channel, the air guide channel penetrating the airflow guide ring;

[0010] The nozzle is located at the center of the dressing end of the airflow guide ring;

[0011] A turbine fan is disposed at the end of the airflow guide ring away from the nozzle;

[0012] The front handle is fixed to the bottom of the airflow guide ring and to one end near the dressing end; the front handle is hollow inside.

[0013] The rear handle is fixed to the bottom of the airflow guide ring and is located at the opposite end of the front handle; the rear handle is hollow inside; the front handle is inclined and tilted towards the bottom of the rear handle, and the bottom of the front handle is fixed to the bottom of the rear handle.

[0014] A material feeding assembly is fixed inside the front handle; the material feeding assembly includes: a syringe, a stepper screw motor, a clamping plate, and a push plate; the clamping plate is fixedly connected to the inner wall of the front handle, and the syringe is clamped inside the clamping plate; the injection end of the syringe is connected to the nozzle, and the piston end abuts against the push plate; the push plate is threadedly connected to the lead screw of the stepper screw motor; the stepper screw motor is fixedly connected to the inner wall of the front handle.

[0015] A high-voltage power supply is fixed inside the rear handle; the positive terminal of the high-voltage power supply is connected to the nozzle via a wire.

[0016] The beneficial effects of adopting the above technical solution are that, in this invention, the positive terminal of the high-voltage power supply is connected to the nozzle, which can apply high-voltage electrostatics to the material inside the nozzle, and form multiple electrospun jets under the action of high-voltage electrostatics. The air guide channel at the rear of the airflow guide ring is connected to the turbine fan, which can form a uniform airflow field with adjustable intensity around the electrospun jets, constrain and guide the direction of the electrospun jets, thereby converging the electrospun jet bundles and improving the electrospun fiber deposition efficiency, realizing the efficient preparation of dressings in situ on the wound surface; at the same time, the device is lightweight, easy to use, and portable.

[0017] Preferably, the airflow guide ring is connected to a duct near one end of the rear handle, the duct has open ends, and the turbine fan is fixed inside the duct; the air guide channel is connected to the inside of the duct body; and the rear handle is fixed to the bottom of the duct. The duct configuration allows for better fixation of the turbine fan.

[0018] Preferably, a filter screen is fixed inside the air duct, and the filter screen is positioned between the turbine fan and the airflow guide ring. The filter screen can filter dust and bacteria from the air.

[0019] Preferably, the surface of the nozzle's spray end is arc-shaped, and multiple liquid outlet holes are formed on the surface of the nozzle's spray end, arranged in an array. The end of the nozzle furthest from the spray end is connected to the syringe via a conduit, which passes through the sidewall of the airflow guide ring and the front handle. The arc-shaped design of the nozzle surface can reduce the weakening effect of the outer nozzles on the electric field strength of the inner nozzles, effectively improving the uniformity of the electric field distribution among different nozzles in the array.

[0020] Preferably, the nozzle and the airflow guide ring are connected by a transition fit. The transition fit between the airflow guide ring and the nozzle facilitates the assembly of the nozzle.

[0021] Preferably, a mounting port for attaching and detaching the syringe is provided on the side wall of the front handle. The mounting port facilitates the replacement of the syringe and also makes it easy to install the syringe loaded with materials inside the front handle.

[0022] Preferably, the surface of the rear handle is provided with an LCD display, a start button, and a stop button. The LCD display can display the current process parameters, and the LCD display also has buttons for setting the process parameters.

[0023] Preferably, the bottom ends of the front handle and the rear handle are fixed with a base, and the base is hollow inside.

[0024] Preferably, the base houses a battery and a controller; the battery, LCD display, stepper motor, turbine fan, start button, and stop button are all connected to the controller via wires; the LCD display, stepper motor, and turbine fan are also connected to the battery via wires. The battery provides power to the controller, LCD display, stepper motor, and turbine fan.

[0025] Preferably, the base is provided with an external power socket, which is connected to the battery, controller, LCD display and stepper motor via wires.

[0026] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a handheld high-efficiency in-situ dressing preparation device based on electric field coupling, the beneficial effects of which are:

[0027] (1) In this invention, the gas field is used to gather multiple electrospinning jets, which can effectively improve the fiber deposition efficiency and achieve efficient preparation of dressings;

[0028] (2) A variable air field intensity can be provided by the airflow guide ring and the turbine fan to control the deposition position of the electrospinning jet and improve the uniformity of electrospinning fiber deposition.

[0029] (3) Using an array of nozzles can form multiple electrospinning jets, which greatly increases the amount of fiber deposited per unit time.

[0030] (4) Using a turbine fan instead of an external air source can greatly reduce the size and weight of the device and improve its portability;

[0031] (5) The airflow guide ring, turbine fan, front handle, rear handle and base are integrated into one design, which provides structural rigidity to the device while reducing the size of the device and the number of parts, thus reducing the complexity of the device. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 An internal cross-sectional view of the dressing device provided by the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the airflow guide ring dressing end provided by the present invention.

[0035] In the figure,

[0036] 1-Airflow guide ring;

[0037] 11-Air guide groove; 12-Air guide channel;

[0038] 2- Nozzle;

[0039] 21-Liquid outlet hole;

[0040] 3- Turbine fan; 4- Front handle; 5- Rear handle;

[0041] 6-Material feed assembly;

[0042] 61-Instrument; 62-Stepper screw motor; 63-Clamping plate; 64-Push plate;

[0043] 7-High voltage power supply; 8-Air duct; 9-Filter screen; 10-Conduit; 011-LCD display; 012-Start button; 013-Stop button; 014-Base; 015-Battery; 016-Controller; 017-External power socket. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1:

[0046] This invention discloses a handheld, high-efficiency in-situ dressing preparation device based on electric field coupling, comprising:

[0047] The airflow guide ring 1 has multiple air guide grooves 11 evenly opened along the circumferential direction at the dressing end of the airflow guide ring 1. The air guide grooves 11 extend into the interior of the airflow guide ring 1 to form an air guide channel 12, which passes through the airflow guide ring 1.

[0048] Nozzle 2 is located at the center of the dressing end of the airflow guide ring 1;

[0049] Turbine fan 3 is located at the end of airflow guide ring 1 away from nozzle 2;

[0050] The front handle 4 is fixed to the bottom of the airflow guide ring 1 and to one end near the dressing end; the front handle 4 is hollow inside.

[0051] The rear handle 5 is fixed to the bottom of the airflow guide ring 1 and is located at the opposite end of the front handle 4; the rear handle 5 is hollow inside; the front handle 4 is inclined and tilted towards the bottom of the rear handle 5, and the bottom of the front handle 4 is fixed to the bottom of the rear handle 5.

[0052] Material feeding assembly 6 is fixed inside the front handle 4. Material feeding assembly 6 includes: syringe 61, stepper screw motor 62, clamping plate 63, and push plate 64. Clamping plate 63 is fixedly connected to the inner wall of front handle 4, and syringe 61 is clamped in clamping plate 63. The injection end of syringe 61 is connected to nozzle 2, and the piston end abuts against push plate 64. Push plate 64 is threadedly connected to the lead screw of stepper screw motor 62. Stepper screw motor 62 is fixedly connected to the inner wall of front handle 4.

[0053] A high-voltage power supply 7 is fixed inside the rear handle 5; the positive terminal of the high-voltage power supply 7 is connected to the nozzle 2 via a wire. The syringe 61 contains natural or synthetic polymer materials suitable for wound treatment. The syringe 61 is a disposable syringe. The air guide groove 11 is annular. Both the syringe 61 and the nozzle 2 must be replaced after each use.

[0054] To further optimize the above technical solution, an airflow guide ring 1 is connected to a wind tunnel 8 near the rear handle 5. The wind tunnel 8 has open ends, and the turbine fan 3 is fixed inside the wind tunnel 8. The air guide channel 12 is connected to the inside of the tube 8. The rear handle 5 is fixed to the bottom of the wind tunnel 8. The air from the turbine fan 3 is ejected from the air guide channel, which can form a uniform airflow field with adjustable intensity around the electrospinning jet, constraining and guiding the direction of the electrospinning jet.

[0055] To further optimize the above technical solution, a filter screen 9 is fixed inside the air duct 8, and the filter screen 9 is placed between the turbine fan 3 and the airflow guide ring 1.

[0056] To further optimize the above technical solution, the surface of the nozzle 2's spray end is arc-shaped, and multiple liquid outlet holes 21 are formed on the surface of the nozzle 2's spray end, arranged in an array. The end of the nozzle 2 furthest from the spray end is connected to the syringe 61 via a conduit 10, which passes through the airflow guide ring 1 and the side wall of the front handle 4. Five liquid outlet holes 21 are provided, such as... Figure 2 As shown, there is one liquid outlet hole 21 in the middle and four liquid outlet holes 21 around the perimeter.

[0057] To further optimize the above technical solution, the nozzle 2 and the airflow guide ring 1 adopt a transitional connection method.

[0058] To further optimize the above technical solution, an installation port for disassembling and assembling the syringe 61 is opened on the side wall of the front handle 4.

[0059] To further optimize the above technical solution, the surface of the rear handle 5 is equipped with an LCD display 011, a start button 012, and a stop button 013. The start button 012 and the stop button 013 each have two working modes: long press and short press. When the start button 012 is pressed for a long press, the push plate 64 advances rapidly; when pressed for a short press, the push plate 64 moves according to the set parameters and simultaneously starts the high-voltage power supply 7 and the turbine fan 3. When the stop button 013 is pressed for a long press, the push plate 64 retracts rapidly; when pressed for a short press, the push plate 64 stops moving and simultaneously stops the high-voltage output of the high-voltage power supply 7 and turns off the turbine fan 3.

[0060] To further optimize the above technical solution, a base 014 is fixed to the bottom of the front handle 4 and the rear handle 5, and the base 014 is hollow inside.

[0061] To further optimize the above technical solution, the base 014 contains a battery 015 and a controller 016. The battery 015, LCD display 011, stepper motor 62, turbine fan 3, start button 012, and stop button 013 are all connected to the controller 016 via wires. The LCD display 011, stepper motor 62, turbine fan 3, and battery 015 are also connected via wires. The battery 015 is a lithium battery.

[0062] To further optimize the above technical solution, the base 014 is provided with an external power socket 017, which is connected to the controller 016, the LCD display 011, and the stepper motor 62 via wires.

[0063] Work process:

[0064] First, insert the syringe 61 containing electrospun material into the clamp 63 of the front handle 4, and insert the nozzle 2 into the airflow guide ring 1. Then, check and set the process parameters on the LCD display 011 to match the material being used. Press and hold the start button 012, and the stepper screw motor 62 will push the push plate 64 to advance rapidly, pushing the material in the syringe 61 into the nozzle 2. Visually observe that a small amount of material is squeezed out at the nozzle 2, and release the start button 012. Aim the nozzle 2 at the wound site to be treated, press the start button 012 briefly, and the stepper screw motor 62 will drive the push plate 64 to squeeze out the material at the preset feed speed. At the same time, the high-voltage power supply 7 and the turbine fan 3 will start. The high-voltage power supply 7 will apply high voltage static electricity to the nozzle 2. Under the combined action of the extrusion force, the static force and the external air field, the material forms an electrospun jet, which forms a fibrous film dressing at high speed at the wound site. After the dressing is applied, briefly press the stop button 013 to stop the material feeding, cut off the high-voltage power supply 7 and turn off the turbine fan 3. Finally, press and hold the stop button 013 to quickly retract the push plate 6 and remove the syringe 61.

[0065] Example 2:

[0066] Polyvinyl butyral (PVB) was dissolved in anhydrous ethanol and stirred at room temperature for 4 hours to prepare an 8% (w / v) PVB solution. This solution was then added to syringe 61. The syringe 61 containing the PVB solution was inserted into clamp 63, and nozzle 2 was inserted into airflow guide ring 1. The high-voltage power supply 7 was set to output voltage of 12kV, feed rate of 10mL / h, and turbine fan 3 input voltage of 12V. The start button 012 was pressed and held, causing push plate 64 to advance rapidly, pushing the material from syringe 61 into nozzle 2. A small amount of material was visually extruded from nozzle 2. The start button 012 was then released. Aim nozzle 2 at the wound site requiring treatment, briefly press start button 012, stepper screw motor 62 drives push plate 64 to extrude material at a preset feed speed, simultaneously high voltage power supply 7 and turbine fan 3 start, high voltage power supply 7 applies high voltage static electricity to nozzle 2, under the combined action of extrusion force, static force and external air field, the material forms an electrospun jet, forming a fibrous film dressing at high speed on the wound site; after dressing is completed, briefly press stop button 013 to stop material feeding, cut off high voltage power supply 7 and turn off turbine fan 3, finally press stop button 013 for a long time, push plate 64 quickly retracts, remove syringe 61.

[0067] The other technical solutions in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0068] Example 3:

[0069] Polyvinyl alcohol (PVA) was added to deionized water and stirred at 80°C for 2 hours to prepare a 7.5% (w / v) PVA solution. After the PVA solution cooled to room temperature, it was added to syringe 61 and clamped into clamp 63. The nozzle 2 was then inserted into the airflow guide ring 1. The high-voltage power supply 7 was set to output voltage of 12kV, feed rate of 3mL / h, and turbine fan 3 input voltage of 12V. The start button 012 was pressed and held, the push plate 64 advanced rapidly, pushing the material in syringe 61 into nozzle 2. A small amount of material was visually extruded from nozzle 2. The start button 012 was then released. The nozzle 2 was aligned with the wound area to be treated, and the start button 012 was pressed briefly. The lead screw motor 62 drives the push plate 64 to extrude material at a preset working speed. At the same time, the high-voltage power supply 7 and the turbine fan 3 are started. The high-voltage power supply 7 applies high-voltage static electricity at the nozzle 2. Under the combined action of extrusion force, static force and external air field, the material forms an electrospun jet, which forms a fibrous film dressing at high speed on the wound site. After the dressing is completed, press the stop button 013 briefly to stop the material feeding, cut off the supply of high-voltage power supply 7 and turn off the turbine fan 3. Finally, press the stop button 013 for a long time, and the push plate 64 will quickly retract to remove the syringe 61.

[0070] The other technical solutions in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0071] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0072] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A handheld, high-efficiency in-situ dressing preparation device based on electric field coupling, characterized in that, include: An airflow guide ring (1) has multiple air guide grooves (11) evenly opened along the circumferential direction at the dressing end of the airflow guide ring (1). The air guide grooves (11) extend into the interior of the airflow guide ring (1) to form an air guide channel (12), and the air guide channel (12) passes through the airflow guide ring (1). The nozzle (2) is located at the center of the dressing end of the airflow guide ring (1); the surface of the spray end of the nozzle (2) is an arc surface, and multiple liquid outlet holes (21) are opened on the surface of the spray end of the nozzle (2), and the multiple liquid outlet holes (21) are arranged in an array. Turbine fan (3), the turbine fan (3) is located at one end of the airflow guide ring (1) away from the nozzle (2); the wind from the turbine fan (3) is ejected from the air guide channel to form a uniform airflow field with adjustable intensity around the electrospinning jet, constraining and guiding the direction of the electrospinning jet; The front handle (4) is fixed to the bottom of the airflow guide ring (1) and close to the dressing end; the front handle (4) is hollow inside. The rear handle (5) is fixed to the bottom of the airflow guide ring (1) and located at the opposite end of the front handle (4); the rear handle (5) is hollow inside; the front handle (4) is inclined and tilted towards the bottom of the rear handle (5), and the bottom of the front handle (4) is fixed to the bottom of the rear handle (5). A material feeding assembly (6) is fixed inside the front handle (4); the material feeding assembly (6) includes: a syringe (61), a stepper screw motor (62), a clamping plate (63), and a push plate (64); the clamping plate (63) is fixedly connected to the inner wall of the front handle (4), and the syringe (61) is clamped in the clamping plate (63); the injection end of the syringe (61) is connected to the nozzle (2), and the piston end abuts against the push plate (64); the push plate (64) is threadedly connected to the lead screw of the stepper screw motor (62); the stepper screw motor (62) is fixedly connected to the inner wall of the front handle (4); A high-voltage power supply (7) is fixed inside the rear handle (5); the positive terminal of the high-voltage power supply (7) is connected to the nozzle (2) through a wire.

2. The handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to claim 1, characterized in that, The airflow guide ring (1) is connected to a duct (8) at one end near the rear handle (5). The two ends of the duct (8) are open, and the turbine fan (3) is fixed inside the duct (8). The air guide channel (12) is connected to the inside of the cylinder (8). The rear handle (5) is fixed to the bottom of the duct (8).

3. The handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to claim 2, characterized in that, A filter screen (9) is fixed inside the air duct (8), and the filter screen (9) is placed between the turbine fan (3) and the airflow guide ring (1).

4. A handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to any one of claims 1-3, characterized in that, The nozzle (2) is connected to the syringe (61) at the end away from the injection end via a conduit (10), which passes through the side wall of the airflow guide ring (1) and the front handle (4).

5. The handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to claim 4, characterized in that, The nozzle (2) and the airflow guide ring (1) are connected by a transition fit.

6. The handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to claim 5, characterized in that, An installation port for assembling and disassembling the syringe (61) is provided on the side wall of the front handle (4).

7. The handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to claim 1, characterized in that, The surface of the rear handle (5) is provided with a liquid crystal display (011), a start button (012) and a stop button (013).

8. The handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to claim 7, characterized in that, The front handle (4) and the rear handle (5) are fixed with a base (014) at their bottom ends, and the base (014) is hollow inside.

9. A handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to claim 8, characterized in that, The base (014) is equipped with a battery (015) and a controller (016); the battery (015), liquid crystal display (011), stepper screw motor (62), turbine fan (3), start button (012), and stop button (013) are all connected to the controller (016) by wires; the liquid crystal display (011), stepper screw motor (62), and turbine fan (3) are connected to the battery (015) by wires.

10. A handheld high-efficiency in-situ dressing preparation device based on electric field coupling according to claim 9, characterized in that, The base (014) is provided with an external power socket (017), which is connected to the battery (015), controller (016), liquid crystal display (011), and stepper screw motor (62) via wires.

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