A new type of surgical knife with replaceable blades

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, especially, relate to a novel scalpel of replaceable cutter, including casing and the cutter assembly that sets up in the casing, the cutter assembly includes blade and handle, the blade sets up in one end of handle, the other end of handle is detachably inserted in the inside of casing, handle circumference side is equipped with radial telescopic part, the inside of casing is equipped with the limit slot that is compatible with radial telescopic part, when handle is inserted in the casing, radial telescopic part is clamped in corresponding limit slot. The utility model whole structure is simple and ingenious, has improved the connection stability between blade assembly and casing, has guaranteed the work reliability of scalpel, convenient to dismount simultaneously.

Description

Technical Field

[0001] This application belongs to the technical field of medical devices, and in particular relates to a novel surgical scalpel with replaceable blades. Background Technology

[0002] A scalpel is a common medical instrument. An ultrasonic scalpel is a surgical instrument that converts high-frequency mechanical vibrations into longitudinal vibration energy of the blade via a piezoelectric ceramic transducer. It utilizes the heat generated by the vaporization of water within tissue cells to achieve cutting and coagulation. Ultrasonic scalpels have become an important tool in minimally invasive surgery.

[0003] In existing technologies, scalpels typically employ a one-piece blade design. Replacing the blade requires replacing the entire instrument. While some technologies allow for individual blade replacement, these usually use threaded connections, making replacement cumbersome and compromising connection stability. This results in low energy transfer efficiency and compromises operational reliability. Therefore, existing technologies require further improvement. Utility Model Content

[0004] This application provides a novel surgical scalpel with replaceable blades to solve at least one technical problem in the existing related technologies: surgical scalpels usually adopt an integral blade design, and if the blade needs to be replaced during use, the entire instrument needs to be replaced. There are also some related technologies that allow the blade to be replaced separately, but they usually use threaded connections, which makes the replacement operation cumbersome and cannot guarantee the stability of the connection, resulting in low energy transmission efficiency and affecting the reliability of work.

[0005] This application provides a novel surgical knife with replaceable blades, including a housing and a blade assembly disposed within the housing. The blade assembly includes a blade and a handle. The blade is disposed at one end of the handle, and the other end of the handle is detachably inserted into the housing. A radial telescopic member is provided around the handle, and a limiting groove adapted to the radial telescopic member is provided inside the housing. When the handle is inserted into the housing, the radial telescopic member is locked in the corresponding limiting groove.

[0006] Optionally, the radial telescopic member includes an annular spring bead disposed on the periphery of the tool holder, the limiting groove is an annular groove adapted to the annular spring bead, and the housing is provided with a power component for driving the tool holder to rotate around its own axis.

[0007] Optionally, the power assembly includes a motor for driving the tool holder to rotate about its own axis relative to the housing.

[0008] Optionally, the power assembly further includes a drive shaft, one end of which is coaxially connected to the output end of the motor, and the other end of which is coaxially connected to the end of the tool holder away from the blade.

[0009] Optionally, the end of the tool holder away from the blade is provided with a spline shaft, and the end of the drive shaft near the tool holder is provided with a spline groove adapted to the spline shaft, and the spline shaft is inserted into the spline groove.

[0010] Optionally, the end of the handle away from the blade is provided with a first magnetic attraction element, and the housing is provided with a second magnetic attraction element for attracting the first magnetic attraction element.

[0011] Optionally, the blade is equipped with an ultrasonic module, and the housing integrates a transducer, a main board, and a power supply that are electrically connected to each other. The transducer is used to provide ultrasonic waves to the ultrasonic module.

[0012] Optionally, the blade is integrated with a pressure sensor electrically connected to the motherboard, used to collect pressure data generated by the blade during operation and feed it back to the motherboard.

[0013] Optionally, the handle has a wire inside, and a first metal contact is provided at the end of the handle away from the blade. One end of the wire is electrically connected to the pressure sensor on the blade, and the other end of the wire is electrically connected to the first metal contact. The housing has a second metal contact and a data transmission shaft. One end of the data transmission shaft is electrically connected to the second metal contact, and the other end of the data transmission shaft is electrically connected to the motherboard. When the handle is inserted into the housing, the first metal contact and the second metal contact make contact to achieve electrical connection.

[0014] Optionally, the radial telescopic member includes an annular spring bead disposed on the periphery of the tool holder, the limiting groove is an annular groove adapted to the annular spring bead, and the housing is provided with a power component for driving the tool holder to rotate around its own axis.

[0015] The handle and the housing are respectively provided with a first magnetic attractor and a second magnetic attractor that attract each other. The first magnetic attractor includes a ring-shaped neodymium magnet and is sleeved on the end of the handle away from the blade. The second magnetic attractor includes a ring-shaped neodymium magnet with a larger aperture than the first magnetic attractor and is fixed inside the housing at a position corresponding to the first magnetic attractor. When the handle is inserted into the housing, the second magnetic attractor is sleeved on the outer ring of the first magnetic attractor.

[0016] The blade is equipped with an ultrasonic module, and the housing integrates a transducer, a main board, and a power supply that are electrically connected to each other; the blade is also integrated with a pressure sensor that is electrically connected to the main board, which is used to collect the pressure data generated by the blade during operation and feed it back to the main board;

[0017] The power assembly includes a motor and a drive shaft. The motor is electrically connected to the power source. One end of the drive shaft is coaxially connected to the output end of the motor. The end of the tool holder away from the blade is provided with a spline shaft. The end of the drive shaft near the tool holder is provided with a spline groove adapted to the spline shaft. The spline shaft is inserted into the spline groove.

[0018] The handle has a wire inside, and a first metal contact is provided at the end of the handle away from the blade. One end of the wire is electrically connected to the pressure sensor on the blade, and the other end of the wire is electrically connected to the first metal contact. The housing has a second metal contact and a data transmission shaft. One end of the data transmission shaft is electrically connected to the second metal contact, and the other end of the data transmission shaft is electrically connected to the motherboard. When the handle is inserted into the housing, the first metal contact and the second metal contact make contact to achieve electrical connection.

[0019] In this embodiment, the blade assembly is detachably mounted on the housing by the combined action of the radial telescopic member and the limiting groove. When the blade assembly needs to be replaced, simply hold the part of the handle outside the housing and apply a certain pulling force. The radial telescopic member is then squeezed through the inner wall of the housing until it slides out of the limiting groove, thus removing the blade assembly from the housing. The overall structure is simple and ingenious, ensuring the connection stability between the blade assembly and the housing, guaranteeing the working reliability of the scalpel, and facilitating disassembly and assembly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0022] Figure 1 This is a perspective view of a novel surgical scalpel with replaceable blades, as described in an embodiment of this application.

[0023] Figure 2 for Figure 1A schematic diagram of the internal structure of a new type of surgical scalpel with replaceable blades.

[0024] Figure 3 This is a front view of a novel surgical knife with replaceable blades, as described in an embodiment of this application.

[0025] Figure 4 for Figure 3 A cross-sectional view along line AA of a novel replaceable surgical scalpel.

[0026] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0027] Figure 6 This is an exploded view of a novel surgical scalpel with replaceable blades, as described in an embodiment of this application.

[0028] Figure 7 This is an exploded view of the cutting tool assembly in the embodiments of this application.

[0029] Figure 8 for Figure 7 Enlarged view of section C.

[0030] Figure 9 This is a schematic diagram of the transmission component, transducer, motherboard, and other structures in the embodiments of this application.

[0031] Figure 10 for Figure 9 Enlarged view of section D in the middle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Housing; 101. Limiting groove; 1011. Annular groove; 110. Grip part; 111. Silicone grip; 120. Display module; 121. Display screen; 122. Button; 130. First magnetic component;

[0034] 200. Tool assembly; 210. Insert; 220. Tool holder; 230. Ultrasonic module; 240. Radial telescopic component; 241. Annular spring ball; 250. Second magnetic component; 260. Second metal contact; 270. Splined shaft;

[0035] 300, Power assembly; 310, Motor; 320, Drive shaft; 321, Spline groove; 330, Data transmission shaft; 400, Transducer; 500, Mainboard; 600, Power supply; 610, Battery; 620, Charging module. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0037] This application provides a novel swing-arm scalpel and a sorting system using the swing-arm scalpel to solve the technical problems existing in the prior art: Surgical scalpels typically use an integral blade design, requiring a complete replacement of the instrument if the blade needs to be changed. While some technologies allow for individual blade replacement, these usually employ threaded connections, making replacement cumbersome and compromising connection stability, resulting in low energy transmission efficiency and affecting operational reliability. The following description, in conjunction with the accompanying drawings, will illustrate this.

[0038] Reference Figure 1 and Figure 2 , Figure 1 This is a perspective view of a novel surgical scalpel with replaceable blades, as described in an embodiment of this application. Figure 2 for Figure 1 This application provides a schematic diagram of the internal structure of a novel scalpel with replaceable blades. The novel scalpel with replaceable blades includes a housing 100 and a blade assembly 200 disposed within the housing 100. The blade assembly 200 includes a blade 210 and a handle 220. The blade 210 is disposed at one end of the handle 220, and the other end of the handle 220 is detachably inserted into the housing 100. A radial telescopic member 240 is provided around the handle 220, and a limiting groove 101 adapted to the radial telescopic member 240 is provided inside the housing 100. When the handle 220 is inserted into the housing 100, the radial telescopic member 240 is locked in the corresponding limiting groove 101.

[0039] By adopting the above technical solution, under the combined action of the radial telescopic member 240 and the limiting groove 101, the blade assembly 200 is detachably mounted on the housing 100. When the blade assembly 200 needs to be replaced, simply hold the part of the handle 220 located outside the housing 100 and apply a certain pulling force. The radial telescopic member 240 is squeezed through the inner wall of the housing 100 until it slides out of the limiting groove 101, and the blade assembly 200 can be removed from the housing 100. The overall structure is simple and ingenious, ensuring the connection stability between the blade assembly 200 and the housing 100, ensuring the working reliability of the scalpel, and facilitating disassembly and assembly.

[0040] Specifically, refer to Figure 3 and Figure 4 , Figure 3This is a front view of a novel surgical knife with replaceable blades according to an embodiment of this application. Figure 4 for Figure 3 A cross-sectional view along line AA of a novel replaceable scalpel. The housing 100 can be configured in a shape suitable for gripping, for example, configured as... Figure 1 The streamlined shape shown can be complemented by a grip portion 110 located at a suitable position on the outside of the housing 100. For example, the grip portion 110 can be configured as follows: Figure 1 The silicone grip 111 shown has textured anti-slip contacts. The housing 100 may have a chamber adapted to fit the handle 220.

[0041] The blade 210 and the handle 220 are detachably connected via screws or other fasteners, facilitating manual replacement of the blade. The handle 220 can be cylindrical, with the diameter of the end near the blade 310 being smaller than the diameter of the end of the handle 220 inserted into the housing 100. Specifically, in some embodiments, the radial telescopic member 240 can be an annular spring bead 241. Specifically, the spring bead can be a silicon nitride ceramic bead, with multiple spring beads evenly arranged in a ring around the larger diameter end of the handle 220. The spring beads have a predetermined spring stiffness. The limiting groove 101 can be an annular groove 1011 adapted to the annular spring bead. The maximum radius of the annular groove 1011 is slightly larger than the outer diameter of the end of the handle 220 located inside the housing 100. When the handle 220 is not inserted into the housing 100... During the insertion of the blade handle 220 into the housing 100, the annular spring bead 241 is initially compressed by the inner wall of the housing 100, resulting in a contracted state. When the annular spring bead 241 enters the annular groove 1011, the compression of the inner wall of the housing 100 is released, and the annular spring bead 241 is in its extended state. An interference fit is achieved between the annular spring bead 241 and the annular groove 1011, thereby detachably and relatively securely mounting the blade handle 220 to a predetermined position on the housing 100. Furthermore, the blade handle 220 can rotate relative to the housing 100 around its own axis, allowing adjustment of the angle of the blade 210 to improve the convenience of surgical operation.

[0042] Furthermore, refer to Figure 5 and Figure 6 , Figure 5 for Figure 4 Enlarged view of part B in the middle. Figure 6This is an exploded view of a novel surgical scalpel with replaceable blades according to an embodiment of this application. To facilitate adjustment of the blade 210 angle during use, a power assembly 300 for driving the handle 220 to rotate around its own axis can be provided within the housing 100. The power assembly 300 includes a motor 310 capable of driving the handle 220 to move relative to the housing 100 around its own axis. Specifically, the power assembly 300 may also include a drive shaft 320, one end of which is coaxially connected to the output end of the motor 310, and the other end of which is coaxially connected to the end of the handle 220 away from the blade 210. During use, the motor 310 drives the handle 220 to rotate, thereby precisely controlling the angle of the blade 210 and facilitating surgical operations.

[0043] Specifically, refer to Figures 7 to 10 , Figure 7 This is an exploded view of the cutting tool assembly in the embodiments of this application. Figure 8 for Figure 6 Enlarged view of section C, Figure 9 This is a schematic diagram of the transmission component, transducer, motherboard, and other structures in the embodiments of this application. Figure 10 for Figure 8 Enlarged view of section D. A splined shaft 270 can be provided at the end of the handle 220 away from the blade 210, and a splined groove 321 adapted to the splined shaft 270 can be provided at the end of the drive shaft 320 near the handle 220, so that the splined shaft 270 is inserted into the splined groove 321, thereby realizing detachable transmission between the motor 310 and the handle 220, and the axial displacement fluctuation of the drive shaft 320 is relatively small, which further helps to improve the installation stability of the handle 220. More specifically, chambers for accommodating the drive shaft 320 and the motor 310 can be provided in the housing 100, respectively. The inner diameter of the chamber where the drive shaft 320 is located can be set to be smaller than the inner diameter of the chamber where the handle 220 is located or the inner diameter of the chamber where the motor 310 is located, respectively. So when the handle 220 is pulled out of the housing 100, it can play a certain limiting role for the motor 310 and other components, preventing the motor 310 and other components from being pulled out together, which helps to ensure the working reliability of the scalpel.

[0044] Furthermore, refer to Figure 4 and Figure 5In some embodiments, to further improve the installation stability of the tool assembly 200, a first magnetic chuck 130 and a second magnetic chuck 250 that attract each other can be provided. Specifically, the first magnetic chuck 130 is provided at the end of the tool holder 220 away from the blade 210. The first magnetic chuck 130 can be set as an annular neodymium magnet. The tool holder 220 is provided with a matching annular notch at a corresponding position. The first magnetic chuck 130 is fixedly sleeved on the annular notch of the tool holder 220. The second magnetic chuck 250 is fixed inside the housing 100 at a position corresponding to the first magnetic chuck 130. The second magnetic chuck 250 can also be a ring-shaped neodymium magnet, and the aperture of the second magnetic chuck 250 is larger than the aperture of the first magnetic chuck 130. When the handle 220 is inserted into the housing 100, the second magnetic chuck 250 fits perfectly on the outer ring of the first magnetic chuck 130. Thus, under the action of magnetic force, combined with the mechanical limiting effect between the radial telescopic member 240 and the limiting groove 101, the knife assembly 200 is double-fixed, further improving the connection stability between the handle 220 and the housing 100, thereby helping to ensure the working reliability of the scalpel.

[0045] Furthermore, in some embodiments, an ultrasonic module 230 can be provided on the blade, while a transducer 400, a main board 500, and a power supply 600, which are electrically connected to each other, are integrated within the housing 100, thereby making this application applicable to ultrasonic surgical scalpels. Specifically, the power supply 600 is electrically connected to the motor 310 and the main board 500. The transducer 400 can be a piezoelectric ceramic transducer commonly used in the art. The transducer 400 is electrically connected to the motor 310, which can be a high-speed micro motor commonly used in the art. The transducer 400 forms a mechanical resonant coupling with the drive shaft 320, and the high-frequency vibration is transmitted to the ultrasonic module 230 on the blade 210 through the drive shaft 320 for ultrasonic surgery.

[0046] Furthermore, in some embodiments, a pressure sensor (not shown in the figure) electrically connected to the motherboard 500 can be integrated on the blade 210. Specifically, the pressure sensor is preferably a flexible thin-film sensor. Vibration frequency compensation algorithms and motor torque angle adjustment algorithms (algorithms from existing related technologies) can also be integrated on the motherboard 500. The pressure sensor collects pressure data from the blade 210 in real time and feeds it back to the motherboard 500. The motherboard 500 can adjust the power of the ultrasonic module 230 and the torque angle of the motor 310 based on the pressure data, thereby adjusting the vibration frequency, working posture, and working angle of the blade 210 in real time to facilitate surgical operations. Furthermore, a wireless transmission module (not shown in the figure) can also be integrated on the motherboard 500 to transmit relevant pressure data to other devices for monitoring and review of the surgery.

[0047] Specifically, in some embodiments, the power supply 600 includes a battery 610 and a charging module 620 for charging the battery 610. The battery 610 is used to provide power, and the charging module 620 may be configured as a wireless charging module. To achieve electrical connection between the pressure sensor on the blade 210 and components such as the motherboard 500 and power supply 600, a wire can be installed inside the handle 220. A first metal contact (not shown in the figure) is installed at the end of the handle 220 away from the blade 210. One end of the wire is electrically connected to the pressure sensor on the blade 210, and the other end of the wire is electrically connected to the first metal contact. At the same time, a second metal contact 260 and a data transmission shaft 330 are installed inside the housing 100. The data transmission shaft 330 can be arranged along the drive shaft 320. One end of the data transmission shaft 330 is electrically connected to the second metal contact 260, and the other end of the data transmission shaft 330 is electrically connected to the motherboard 500. When the handle 220 is inserted into the housing 100, the first metal contact and the second metal contact 260 contact to achieve electrical connection, thereby realizing the electrical connection between the pressure sensor on the blade 210 and components such as the motherboard 500 and power supply 600. The overall structure is compact and ingenious, facilitating quick assembly and disassembly of the blade assembly 200.

[0048] Furthermore, in some embodiments, to facilitate real-time observation of the scalpel's working data and switching of the scalpel's working mode, a display module 120 can be integrated on the housing 100. Specifically, the display module 120 is electrically connected to the motherboard 500, and includes a display screen 121 embedded outside the housing 100 and a button 122 for switching modes. The display screen 121 can be a capacitive touchscreen, supporting touch operation under thick latex gloves, thereby allowing the user to view and adjust the scalpel's operation through the display screen 121.

[0049] In summary, the embodiments of this application provide a novel surgical scalpel with a quick-change blade, which can integrate ultrasonic modes, such as ultrasonic cutting mode or ultrasonic coagulation mode. The overall structure is simple and ingenious, which improves the ease of use and reliability of the surgical scalpel, and helps to ensure surgical precision and efficiency.

[0050] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0051] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0052] The above provides a detailed description of a novel surgical knife with replaceable blades according to the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A novel surgical scalpel with replaceable blades, comprising a housing and a blade assembly disposed within the housing, characterized in that, The cutting tool assembly includes a blade and a handle. The blade is disposed at one end of the handle, and the other end of the handle is detachably inserted into the housing. A radial telescopic member is provided around the handle, and a limiting groove adapted to the radial telescopic member is provided inside the housing. When the handle is inserted into the housing, the radial telescopic member is locked in the corresponding limiting groove.

2. The novel surgical scalpel with replaceable blades according to claim 1, characterized in that, The radial telescopic component includes an annular spring bead disposed around the circumference of the tool holder, the limiting groove is an annular groove adapted to the annular spring bead, and the housing is provided with a power component for driving the tool holder to rotate around its own axis.

3. A novel surgical scalpel with replaceable blades according to claim 2, characterized in that, The power unit includes a motor for driving the tool holder to rotate about its own axis relative to the housing.

4. A novel surgical scalpel with replaceable blades according to claim 3, characterized in that, The power assembly also includes a drive shaft, one end of which is coaxially connected to the output end of the motor, and the other end of which is coaxially connected to the end of the tool holder away from the blade.

5. A novel surgical scalpel with replaceable blades according to claim 4, characterized in that, The end of the tool holder away from the blade is provided with a spline shaft, and the end of the drive shaft near the tool holder is provided with a spline groove adapted to the spline shaft, and the spline shaft is inserted into the spline groove.

6. A novel surgical scalpel with replaceable blades according to any one of claims 1 to 5, characterized in that, The end of the handle away from the blade is provided with a first magnetic attraction element, and the housing is provided with a second magnetic attraction element for attracting the first magnetic attraction element.

7. A novel surgical scalpel with replaceable blades according to claim 6, characterized in that, The blade is equipped with an ultrasonic module, and the housing integrates a transducer, a main board, and a power supply that are electrically connected to each other. The transducer is used to provide ultrasonic waves to the ultrasonic module.

8. A novel surgical scalpel with replaceable blades according to claim 7, characterized in that, The blade has an integrated pressure sensor that is electrically connected to the motherboard, which is used to collect pressure data generated by the blade during operation and feed it back to the motherboard.

9. A novel surgical scalpel with replaceable blades according to claim 8, characterized in that, The handle has a wire inside, and a first metal contact is provided at the end of the handle away from the blade. One end of the wire is electrically connected to the pressure sensor on the blade, and the other end of the wire is electrically connected to the first metal contact. The housing has a second metal contact and a data transmission shaft. One end of the data transmission shaft is electrically connected to the second metal contact, and the other end of the data transmission shaft is electrically connected to the motherboard. When the handle is inserted into the housing, the first metal contact and the second metal contact make contact to achieve electrical connection.

10. A novel surgical scalpel with replaceable blades according to claim 1, characterized in that: The radial telescopic member includes an annular spring bead disposed on the periphery of the tool holder, the limiting groove is an annular groove adapted to the annular spring bead, and the housing is provided with a power component for driving the tool holder to rotate around its own axis. The handle and the housing are respectively provided with a first magnetic attractor and a second magnetic attractor that attract each other. The first magnetic attractor includes a ring-shaped neodymium magnet and is sleeved on the end of the handle away from the blade. The second magnetic attractor includes a ring-shaped neodymium magnet with a larger aperture than the first magnetic attractor and is fixed inside the housing at a position corresponding to the first magnetic attractor. When the handle is inserted into the housing, the second magnetic attractor is sleeved on the outer ring of the first magnetic attractor. The blade is equipped with an ultrasonic module, and the housing integrates a transducer, a main board, and a power supply that are electrically connected to each other; the blade is also integrated with a pressure sensor that is electrically connected to the main board, which is used to collect the pressure data generated by the blade during operation and feed it back to the main board; The power assembly includes a motor and a drive shaft. The motor is electrically connected to the power source. One end of the drive shaft is coaxially connected to the output end of the motor. The end of the tool holder away from the blade is provided with a spline shaft. The end of the drive shaft near the tool holder is provided with a spline groove adapted to the spline shaft. The spline shaft is inserted into the spline groove. The handle has a wire inside, and a first metal contact is provided at the end of the handle away from the blade. One end of the wire is electrically connected to the pressure sensor on the blade, and the other end of the wire is electrically connected to the first metal contact. The housing has a second metal contact and a data transmission shaft. One end of the data transmission shaft is electrically connected to the second metal contact, and the other end of the data transmission shaft is electrically connected to the motherboard. When the handle is inserted into the housing, the first metal contact and the second metal contact make contact to achieve electrical connection.

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