Endoscopic surgery planer

Abstract

The utility model belongs to the technical field of medical instruments, and discloses an endoscopic surgery planer. The planing device for the endoscopic surgery comprises a tool bit, a power handle and a main machine. Wherein a driving part is arranged in the power handle, the driving part is in transmission connection with the tool bit, a plurality of switch keys are arranged on the power handle, and the switch keys are used for controlling the rotating state of the driving part; the driving part is electrically connected with the host, the switch button is in signal connection with the host only through a wire, and the rotation state switching of the driving part is completed through the on-off operation of the switch button. According to the utility model, the problem that the maintenance cost is increased due to the fact that the key circuit board is easy to damage under high-temperature, high-pressure and high-humidity conditions at present is solved, the compactness of the whole handle structure is improved, and the surgical operation of a doctor is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially, relate to endoscope operation planer. BACKGROUND

[0002] In endoscope operation, the doctor needs to cut the soft tissue and bone tissue in joint, and the planer is a kind of commonly used surgical instrument, and it is designed especially for wear joint arthroplasty, synovectomy and cutting and scraping in joint. Specifically, in the operation process, the doctor uses the planer to clean and shape the synovial membrane, meniscus, cartilage and other tissues in joint or to remove and shape the osteophyte and articular surface in joint to reach the treatment purpose.

[0003] In the prior art, the cutter head of the planer is installed on one end of the power handle, and a motor and other structures are arranged inside the power handle to provide power for the cutter head, and in addition, circuit board and other components are also arranged inside the power handle.

[0004] The power handle is a reusable component, and after each operation, the power handle needs to be sterilized. At present, the main sterilization condition is high temperature, high pressure and high humidity sterilization. Specifically, sterilization is carried out at a temperature of 134 DEG C and 2 atmospheres for 10 minutes. Under the condition of high temperature, high pressure and high humidity, the key circuit board is easy to be damaged, thereby increasing the maintenance cost. On the other hand, the overall length of the current power handle is large and the compactness is poor, and the convenience of operation is low when the doctor uses it. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an endoscope operation planer, which is used to solve the problem that the key circuit board is easy to be damaged under the condition of high temperature, high pressure and high humidity, thereby increasing the maintenance cost, and to improve the compactness of the overall power handle structure and facilitate the operation of the doctor.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The endoscope operation planer comprises:

[0008] A cutter head;

[0009] A power handle, a driving member is arranged in the power handle, the driving member is in transmission connection with the cutter head, a plurality of switch keys are arranged on the power handle, and the plurality of switch keys are used to control the rotation state of the driving member;

[0010] A main machine, the driving member is electrically connected with the main machine, the main machine is only connected with the switch key through wire signal, and the rotation state switching of the driving member is completed through the on operation and off operation of the switch key.

[0011] As an alternative to an endoscopic surgical shaving device, the cutting head includes an inner blade and an outer blade, the inner blade being drivenly connected to the drive unit, and the outer blade being engaged with the end of the power handle.

[0012] As an alternative to an endoscopic surgical shaving device, the outer blade is provided with a slot, and the end of the power handle is provided with a locking protrusion, which is inserted into and engaged with the slot.

[0013] As an alternative to an endoscopic surgical shaving device, multiple switches are connected in parallel, with a recognition resistor connected to a branch of each switch. The branches of the multiple switches are all connected to a main wire and then connected to the main unit through the main wire.

[0014] As an alternative solution for an endoscopic surgical shaving device, multiple switches are connected in parallel, and multiple branches with the switches are respectively connected to the main unit.

[0015] As an alternative to an endoscopic surgical shaving device, the power handle includes a housing, and the switch button is located on the outer wall of the housing. The switch button includes a button and a contact plate, and the switch button is activated by pressing the button and squeezing the contact plate.

[0016] As an alternative to an endoscopic surgical shaving device, the power handle includes a housing with an internal suction channel for connecting a negative pressure suction tube to allow tissue to be suctioned out through the suction channel; the suction channel includes a connection hole formed on the end face of the housing, and the negative pressure suction tube is inserted into the connection hole.

[0017] As an alternative to an endoscopic surgical shaving device, the suction channel has a curved strip-shaped cross-section, and the curved profile of the suction channel matches the outer wall profile of the drive component.

[0018] As an alternative to an endoscopic surgical shaving device, the endoscopic surgical shaving device also includes a cable, through which the power handle is electrically connected to the main unit, and the power handle is connected to the cable via a first plug, which is an aviation plug.

[0019] As an alternative to an endoscopic surgical shaving device, the end of the cable away from the power handle is electrically connected to the main unit via a second plug, which is an aviation plug.

[0020] Beneficial effects:

[0021] In this invention, compared to existing power handles where the switch button is typically integrated into a button circuit board located inside the power handle and electrically connected to the main unit, the endoscopic surgical shaving device eliminates the internal button circuit board of existing power handles. The switch button and the main unit are electrically connected only via wires, and the rotation of the drive component is controlled by a simple on / off circuit. This solves the problem of the button circuit board being damaged by high temperature, high pressure, and high humidity during high-temperature, high-pressure, and high-humidity sterilization environments, while also saving on maintenance costs. Furthermore, the elimination of the button circuit board saves space, allowing for a smaller size and length, thus improving the overall compactness of the power handle and facilitating the surgeon's operation during surgery. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the power handle in the endoscopic surgical shaving device provided in this embodiment of the utility model;

[0023] Figure 2 This is a side view of the power handle in the endoscopic surgical shaving device provided in this embodiment of the utility model;

[0024] Figure 3 yes Figure 2 Sectional view at section AA;

[0025] Figure 4 This utility model embodiment provides a circuit diagram of a first type of parallel switch button;

[0026] Figure 5 This utility model provides a circuit diagram for a second type of parallel switch button.

[0027] In the picture:

[0028] 1. Power handle; 11. Switch button; 12. Locking protrusion; 13. Main wire; 14. Housing; 141. Suction channel; 142. Connection hole; 15. Identification resistor; 16. First plug;

[0029] 2. Driving components;

[0030] 3. Host computer. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] Please see the appendix Figure 1 -Appendix Figure 3 This embodiment relates to an endoscopic surgical shaving device (hereinafter referred to as "shaving device"), which includes a blade head, a power handle 1, and a main unit 3. The power handle 1 contains a drive component 2, which is connected to the blade head via a transmission mechanism. The power handle 1 has multiple switch buttons 11, which are used to control the rotation state of the drive component 2. The drive component 2 is electrically connected to the main unit 3, and the switch buttons 11 are connected to the main unit 3 only via wire signals. The rotation state of the drive component 2 is switched by turning the switch buttons 11 on and off.

[0036] Specifically, the blade head comprises two parts: an inner blade and an outer blade. Both the inner and outer blades are made of stainless steel tubing. Each blade has a handle on its side furthest from the working end. The handle of the inner blade is located inside the handle of the outer blade, and the body of the inner blade is located inside the body of the outer blade. The outer blade is fixedly positioned relative to the power handle 1, allowing the inner blade to rotate relative to the outer blade from within the outer blade. Specifically, the inner blade is connected to a drive unit 2, which rotates the inner blade. The shear difference between the inner and outer blades allows for the cutting of the target lesion tissue.

[0037] The blade is a single-use component and should be removed and disposed of in a medical waste recycling bin after the surgery.

[0038] The power handle 1 is the object that the doctor holds during surgery. The outer wall of the power handle 1 is shaped as a curved surface to facilitate the doctor's grip, usually a cylindrical surface or a closed curved surface that is close to a cylinder. The power handle 1 is rod-shaped, with one end connected to the blade and the other end connected to the main unit 3. The drive unit 2 can be a DC brushless motor, and the power handle 1 is also equipped with multiple switch buttons 11 for controlling the DC brushless motor.

[0039] For example, this embodiment is provided with three switch buttons 11, which are used to control the forward rotation, reverse rotation, and reciprocating rotation of the drive component 2, respectively. The host 3 is equipped with a controller and a power supply, which are used to output status adjustment signals to the drive component 2 and provide electrical energy.

[0040] In existing power handles 1, the switch button 11 is typically integrated into a button circuit board, which is located inside the power handle 1 and electrically connected to the main unit 3. This planer eliminates the existing button circuit board, and the switch button 11 and the main unit 3 are electrically connected only by wires. The rotation of the drive component 2 is controlled by a simple on / off circuit, thus solving the problem of the button circuit board being damaged when the power handle 1 is subjected to high temperature, high pressure, and high humidity sterilization, while also saving on maintenance costs. Furthermore, the elimination of the button circuit board in the entire power handle 1 saves internal space, allowing for a smaller size and length, thus improving the overall compactness of the power handle 1 and facilitating operation during surgery. By reducing the size and length of the power handle 1, doctors can hold it in a pen-like posture during tissue removal surgery, avoiding the inconvenience caused by a grasping posture when the power handle 1 is perpendicular to the tissue.

[0041] Optionally, the outer blade is engaged with the end of the power handle 1.

[0042] In one implementation of this embodiment, the end of the power handle 1 is provided with an annular groove, and the handle of the outer blade is provided with multiple elastic buckles along the circumference. The handle of the outer blade can be directly inserted into the groove, and simultaneously engaged with the inner wall of the groove through the elastic buckles. The snap-fit ​​connection method can improve the connection efficiency of the outer blade and the power handle 1, and the detachable connection method can also facilitate the doctor to perform connection and disassembly operations on both.

[0043] Optionally, the outer blade is provided with a slot, and the end of the power handle 1 is provided with a locking protrusion 12, which is inserted into and locked into the slot.

[0044] In another implementation of this embodiment, the end of the power handle 1 is formed with a cylindrical locking protrusion 12. Adaptively, a slot is provided at the handle of the outer blade, and the locking protrusion 12 is directly inserted into the slot and engaged inside the slot. There are various specific forms of engagement, and this embodiment does not limit them. For example, a buckle or annular protrusion can be provided in the circumferential direction of the locking protrusion 12. When the outer blade and the power handle 1 are inserted together, the buckle or annular protrusion can be smoothly engaged inside the buckle or annular groove inside the slot.

[0045] By providing a slot on the handle of the outer blade, and correspondingly providing a locking protrusion 12 at the end of the power handle 1, the connection between the outer blade and the power handle 1 is achieved through interlocking. Compared to the aforementioned solution of providing a slot at the end of the power handle 1, this method can further shorten the length of the power handle 1. The depth of the slot depends on the length of the outer blade's handle; a greater slot depth results in a greater overall length of the power handle 1, and the two are positively correlated. Even if the length of the outer blade's handle can be adaptively reduced, it is difficult to reduce it significantly. However, by providing a locking protrusion 12 at the end of the power handle 1, which is only used for connecting with the outer blade, the length of the locking protrusion 12 can be significantly reduced. Therefore, compared to the aforementioned solution of providing a slot at the end of the power handle 1, providing a locking protrusion 12 at the end results in a shorter overall length of the power handle 1 and a more compact structure.

[0046] Please see the appendix Figure 4 Optionally, multiple switch buttons 11 are connected in parallel, and each switch button 11 has a recognition resistor 15 connected to its branch. The branches of multiple switch buttons 11 are all connected to the main wire 13 and connected to the host 3 through the main wire 13.

[0047] In one implementation of this embodiment, each switch button 11 is connected as a branch in the circuit, and all branches are electrically connected to the host 3 through the main wire 13. In addition, each branch is provided with an identification resistor 15, so as to ensure that each branch controls the rotation state of a driving component 2.

[0048] Specifically, taking three switch buttons 11 as an example, by triggering the first switch button 11 to connect the first branch, the host 3 can recognize that the branch with the first identification resistor 15 is connected, and thus the host 3 outputs a forward rotation control signal to the drive unit 2; when the second switch button 11 is triggered to connect the second branch, the host 3 can recognize that the branch with the second identification resistor 15 is connected, and thus the host 3 outputs a reverse rotation control signal to the drive unit 2; when the third switch button 11 is triggered to connect the third branch, the host 3 can recognize that the branch with the third identification resistor 15 is connected, and thus the host 3 outputs a reciprocating rotation control signal to the drive unit 2.

[0049] In this embodiment, the three branch circuits are connected to a single main conductor 13, which in turn connects to the main unit 3. The main conductor 13 serves as the confluence of the three branch circuits, and a single connecting cable is used to run inside the power handle 1. This single cable occupies less space inside the power handle 1, allowing for a smaller radial dimension. However, if the main conductor 13 malfunctions, all three branch circuits will fail.

[0050] Please see the appendix Figure 5 Optionally, multiple switches 11 are connected in parallel, and multiple branches with switches 11 are respectively connected to the host 3.

[0051] In another implementation of this embodiment, the three branches are connected to the host 3 respectively. Even if one branch fails, the function of the other two branches will not be affected. Since the connecting cables of the branches are laid around the drive unit 2 and the connecting cables extend from the switch button 11 to the tail end of the power handle 1, and the connecting cables of the three branches need to be laid at the same time, they will occupy more internal space of the power handle 1, thereby causing the radial dimension of the power handle 1 to increase to a certain extent.

[0052] Optionally, the power handle 1 includes a housing 14, and a switch button 11 is disposed on the outer wall of the housing 14. The switch button 11 includes a button and a contact plate. The switch button 11 is turned on by pressing the button and squeezing the contact plate.

[0053] Specifically, the housing 14 has an internal mounting cavity, which is a cylindrical cavity to accommodate the cylindrical structure of the drive component 2. The drive component 2 is placed inside the mounting cavity, and the switch button 11 is located on the outer wall of the housing 14 to facilitate the doctor to hold the power handle 1 and press the corresponding switch button 11. In this embodiment, the switch button 11 only has the functions of connecting and disconnecting. The switch button 11 includes a button and a bridge-shaped contact plate. When the button is pressed, the button squeezes the contact plate to connect the corresponding branch. Of course, in other embodiments, the switch button 11 can also have other forms. For example, the switch button 11 can include a slider and an elastic contact piece. The connection and disconnection are achieved through the interaction between the slider and the elastic contact piece. The surface in contact with the slider and the elastic contact piece can be a wedge-shaped surface, or the part in contact with the slider and the elastic contact piece can be provided with an arc-shaped boss. During the process of pressing or pushing the slider, the wedge-shaped surface or boss of the slider can squeeze the elastic contact piece to deform. The elastic contact piece is an elastic metal sheet. After deformation, it can be used to connect the circuit. When the slider is lifted, the reverse elastic recovery of the elastic contact piece can be used to disconnect the circuit, and at the same time, the slider is squeezed to reset.

[0054] In this embodiment, the overall structure of the switch button 11 is simple and reliable.

[0055] Optionally, the power handle 1 includes a housing 14, and the housing 14 has a suction channel 141 inside. The suction channel 141 is used to connect a negative pressure suction tube so that tissue can be sucked out through the suction channel 141.

[0056] In this embodiment, the lesion tissue cut by the blade can enter the grooves of the inner and outer blades. The grooves are connected to one side of the suction channel 141 inside the housing 14, and the other end of the suction channel 141 is connected to a negative pressure suction tube, through which the lesion tissue can be suctioned out. Specifically, the suction channel 141 can be directly formed in the structure of the housing 14. Alternatively, a tubular component can be placed inside the mounting cavity of the housing 14, and the suction channel 141 can be formed inside the tubular component. Those skilled in the art can choose between the two forms of the suction channel 141 based on the ease of processing and economic considerations. This embodiment does not impose a specific limitation.

[0057] Furthermore, the suction channel 141 includes a connection hole 142 formed on the end face of the housing 14, and a negative pressure suction tube is inserted into the suction hole.

[0058] In this embodiment, the connecting hole 142 is connected to the suction channel 141. The connecting hole 142 is directly formed on the end face of the housing 14. When the connecting hole 142 is used with the negative pressure suction tube, the tip of the negative pressure suction tube is directly inserted into the connecting hole 142, so that the connecting hole 142 and the negative pressure suction tube fit tightly together. Through the above arrangement, it can be ensured that the end of the suction channel 141 does not extend excessively beyond the end face of the housing 14, thereby making the entire power handle 1 shorter and more compact, further facilitating the doctor's gripping and operation or performing surgical operations in a pen-holding posture. The overall power handle 1 is small and flexible while also enabling the expansion of various surgical methods.

[0059] Optionally, the cross-section of the attraction channel 141 is a curved strip, and the curved profile of the attraction channel 141 matches the outer wall profile of the drive member 2.

[0060] Specifically, the cross-section of the suction channel 141 is a curved strip. For example, the suction channel 141 has an arched structure. Without changing the cross-sectional area of ​​the entire suction channel 141, the radial dimension of the suction channel 141 can be reduced, thereby making the suction channel 141 slightly flat in appearance. This ensures that the structure of the suction channel 141 and the structure of the drive component 2 occupy less space inside the entire housing 14, reducing the radial dimension and volume of the overall housing 14 and improving the compactness of the entire power handle 1.

[0061] In this embodiment, by optimizing the structure of the suction channel 141, the outer wall of the entire housing 14 can form a regular cylindrical curved surface structure, which makes it easier for doctors to hold.

[0062] Optionally, the planer also includes a cable, with the power handle 1 electrically connected to the main unit 3 via the cable. The power handle 1 is connected to the cable via a first plug 16, which is an aviation plug.

[0063] In this embodiment, the cable is used to electrically connect the power handle 1 and the main unit 3. When the drive component 2 is a brushless DC motor, the cable not only provides power to the brushless DC motor from the main unit 3, but also transmits control signals to the brushless DC motor, thereby enabling multiple state switching of the drive end of the brushless DC motor. Therefore, for the entire power handle 1, setting the first plug 16 as an aviation plug allows for a plug-and-play connection between the brushless DC motor and the cable, directly eliminating the connection end at the end of the power handle 1, avoiding complex soldering processes, further saving space in the power handle 1, and reducing the overall length of the power handle 1, making it easier for doctors to grip and operate or to perform surgical operations in a pen-like manner.

[0064] Furthermore, the end of the cable away from the power handle 1 is electrically connected to the main unit 3 via a second plug, which is an aviation plug.

[0065] Specifically, the other end of the cable is electrically connected to the main unit 3 via a second plug. Similarly, the second plug can also be an aviation plug to ensure the universality and replaceability of the interface with the main unit 3.

[0066] The existing power handle 1 is usually about 200mm long. Through this application, the improved power handle 1 can be shortened to about 100mm in length, and the overall volume will also be reduced accordingly, which greatly improves the compactness of the entire power handle 1 structure, thereby making it easier for doctors to expand the gripping methods during surgery.

[0067] The operating steps for this planer are as follows:

[0068] ① Before the surgery begins, the power handle 1 needs to be disinfected at 134°C and 2 standard atmospheres for 10 minutes.

[0069] ② When starting the surgery, first remove the sterile packaging and take out the blade. The end of the inner blade is connected to the drive end inside the power handle 1, and the outer blade is engaged with the end of the power handle 1.

[0070] ③ Insert one end of the negative pressure suction tube into the connection hole 142, connect the other end of the negative pressure suction tube to the negative pressure suction device, and start the negative pressure suction device.

[0071] ④ After completing other surgical preparations, the surgery begins. Under the guidance of endoscopic imaging, the blade is placed below the lesion. Negative pressure is used to draw the lesion tissue into the grooves of the inner and outer blades. The main unit 3 controls the internal drive component 2 of the power handle 1 to rotate the inner blade. The doctor can also transmit electrical signals to the main unit 3 through the switch button 11. The main unit 3 will adjust the rotation state of the drive component 2 according to the feedback information to perform adaptive resection. After the cutting is completed, the lesion tissue is discharged sequentially through the suction channel 141, the connecting hole 142 and the negative pressure suction tube.

[0072] ⑤ After the surgery, remove the incision head and discard it into the medical waste recycling bin.

[0073] ⑥ The power handle 1 is cleaned and sent to the sterilization center for sterilization in preparation for subsequent surgeries.

[0074] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An endoscopic surgical shaver characterized by, It includes: The tool bit; The power handle (1) is provided with a driving member (2) inside, the driving member (2) is in transmission connection with the tool bit, a plurality of switch keys (11) are arranged on the power handle (1), and the plurality of switch keys (11) are used for controlling the rotation state of the driving member (2); The driving member (2) is electrically connected with the main machine (3), the switch key (11) is connected with the main machine (3) only through a wire signal, and the rotation state switching of the driving member (2) is completed through the on operation and off operation of the switch key (11).

2. The endoscopic surgical shaver according to claim 1, wherein, The tool bit includes an inner cutter and an outer cutter, the inner cutter is in transmission connection with the driving member (2), and the outer cutter is clamped with the end of the power handle (1).

3. The endoscopic surgical shaver according to claim 2, wherein, The outer cutter is provided with a slot, and the end of the power handle (1) is provided with a clamping convex (12), the clamping convex (12) is inserted and clamped in the slot.

4. The endoscopic surgical shaver according to claim 1, wherein, A plurality of switch keys (11) are arranged in parallel with each other, and an identification resistor (15) is connected on the branch of each switch key (11). The branches of a plurality of switch keys (11) are connected to a total wire (13) and connected to the main machine (3) through the total wire (13).

5. The endoscopic surgical shaver according to claim 1, wherein, A plurality of switch keys (11) are arranged in parallel, and the branches with the switch keys (11) are connected with the main machine (3) respectively.

6. The endoscopic surgical shaver according to claim 1, wherein, The power handle (1) includes a shell (14), the switch key (11) is arranged on the outer wall of the shell (14), the switch key (11) includes a button and a contact plate, and the switch key (11) is turned on by pressing the button and extruding the contact plate.

7. The endoscopic surgical shaver according to claim 1, wherein, The power handle (1) includes a shell (14), the shell (14) is provided with an attraction channel (141) inside, the attraction channel (141) is used for connecting a negative pressure suction pipe, so that the tissue is sucked out through the attraction channel (141); The attraction channel (141) includes a connecting hole (142) formed in the end face of the shell (14), and the negative pressure suction pipe is inserted into the connecting hole (142).

8. The endoscopic surgical shaver according to claim 7, wherein, The cross section of the attraction channel (141) is curved strip, and the curved surface profile of the attraction channel (141) matches the outer wall profile of the driving member (2).

9. The endoscopic surgical shaver according to claim 1, wherein, The endoscope surgery planer also includes a cable, the power handle (1) is electrically connected with the main machine (3) through the cable, the power handle (1) is connected with the cable through a first plug (16), and the first plug (16) is an aviation plug.

10. The endoscopic surgical shaver according to claim 9, wherein, The end of the cable away from the power handle (1) is electrically connected with the main machine (3) through a second plug, and the second plug is an aviation plug.

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