Electric injector capable of controlling injection amount

Abstract

The utility model relates to the technical field of medical instruments, and provides an electric injector capable of controlling injection volume, which is used for clamping a medicine cylinder of an injector body and pushing a handle of the injector, and comprises a mounting frame with a bearing part; the first sliding device comprises a first sliding plate which is arranged on the bearing part in a sliding manner and is used for driving the cartridge to slide; the second sliding device comprises a second sliding plate provided with a push plate, the second sliding plate is slidably arranged on the bearing part and located beside the first sliding plate, the upper end of the second sliding plate is used for bearing the handle, and the push plate is used for abutting against the tail end of the handle; the rotating chuck is provided with a plurality of clamping grooves formed in the circumferential direction in an array mode, the rotating chuck is rotationally arranged on one side of the first sliding plate, and the clamping grooves are used for clamping medicine barrels. By means of the technical scheme, the problem that in the prior art, an injector cannot accurately control the injection amount of liquid medicine in the injection process is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and in particular to an electric injector capable of controlling injection volume. Background Art

[0002] At present, the syringes sold on the market and used in hospitals are composed of a barrel, a handle, and a needle. When using this type of syringe, the handle needs to be pulled or pushed manually to generate vacuum suction or pushing force in the barrel of the syringe, thereby performing the extraction or injection work.

[0003] When drawing medicine from a traditional syringe, the handle is pulled manually to suck out the medicine in the bottle. During the above process, the pulling force cannot be kept uniform, resulting in the extraction process of the medicine being fast or slow, and a large amount of air in the cartridge. After the medicine is drawn, the handle needs to be pushed manually to expel the air in the cartridge. When you want to inject the medicine into the patient, you need to push the handle manually to push the medicine out of the cartridge. During this process, the pushing force of the handle cannot be kept uniform, resulting in the handle being unable to feed the medicine into the patient at a uniform speed. At the same time, the remaining amount of the medicine in the cartridge observed by the naked eye is inaccurate, making it impossible to accurately quantify the injection amount of the medicine. Utility Model Content

[0004] The utility model provides an electric syringe capable of controlling the injection volume, which solves the problem that the syringe in the related art cannot accurately control the injection volume of the medicinal solution during the injection process.

[0005] The technical solution of the utility model is as follows:

[0006] An electric syringe capable of controlling the injection volume, used for clamping the cartridge of the syringe body and pushing the handle of the syringe, characterized in that it comprises:

[0007] A mounting frame having a load-bearing portion;

[0008] A first sliding device, wherein the first sliding device comprises:

[0009] A first slide plate, slidably disposed on the bearing portion, and used to drive the cartridge to slide;

[0010] A second sliding device, wherein the second sliding device comprises:

[0011] The second slide plate has a push plate. The second slide plate is slidably arranged on the bearing portion and is located beside the first slide plate. The upper end of the second slide plate is used to bear the handle, and the push plate is used to abut against the end of the handle.

[0012] Optionally, the first sliding device further includes:

[0013] The rotating chuck has a plurality of clamping grooves arranged in a circumferential array. The rotating chuck is rotatably arranged on one side of the first slide plate, and the clamping grooves are used to clamp the cartridge.

[0014] Optionally, it also includes:

[0015] A locking plate is arranged on one side of the push plate, and a locking groove is formed between the locking plate and the push plate, and the locking groove is used to lock the handle.

[0016] Optionally, it further comprises: a first driving device, used to drive the first sliding device to slide, and the first driving device comprises:

[0017] A first lead screw is rotatably disposed in the bearing portion and is threadedly connected to the first slide plate;

[0018] The first driving motor is arranged in the bearing portion and is used for driving the first lead screw to rotate.

[0019] Optionally, it further comprises: a second driving device, used for driving the second sliding device to slide, and the second driving device comprises:

[0020] A second lead screw is rotatably disposed in the bearing portion and is threadedly connected to the second slide plate;

[0021] The second driving motor is arranged in the bearing part and is used for driving the second lead screw to rotate.

[0022] Optionally, the second driving device further includes:

[0023] A compression spring, one end of which acts on one side of the second slide plate and the other end of which acts on the bearing portion, is used to provide a buffering force when the handle is pushed or pulled.

[0024] Optionally, the device further comprises: a drug supply device, the drug supply device comprising:

[0025] A rotating rod, one end of which is rotatably arranged on one side of the bearing portion;

[0026] A turntable, rotatably arranged at the other end of the rotating rod, the turntable having a plurality of charging holes arranged in a circumferential array, the charging holes being used to clamp a medicine bottle;

[0027] After the rotating rod rotates, the medicine loading hole is used to face the needle on the syringe body.

[0028] Optionally, the side surface of the bearing portion has two slots, and the two slots are located on the same side as the rotating rod. After the rotating rod is rotated, it is engaged with any one of the two slots.

[0029] Optionally, it also includes:

[0030] A third driving device is used to drive the turntable to rotate, and the third driving device comprises:

[0031] An outer gear sleeve, sleeved on the outer circumference of the rotating disk;

[0032] A gear, rotatably disposed on the rotating rod and meshingly connected with the outer gear sleeve;

[0033] A hand wheel, rotatably disposed on the rotating rod, and used to drive the gear to rotate;

[0034] An elastic clamping piece is provided in each of the medicine filling holes, and the elastic clamping piece is used for clamping with the medicine bottle.

[0035] Optionally, the mounting frame further comprises a hand-held portion, and the hand-held portion is located below the bearing portion; and further comprises:

[0036] a first control button, disposed on the handheld portion and communicatively connected to the first drive motor;

[0037] a second control button, disposed on the handheld portion and communicatively connected to the second drive motor;

[0038] The first control button and the second control button are used to control the operation of the first drive motor and the second drive motor respectively.

[0039] The working principle and beneficial effects of the utility model are:

[0040] In the utility model, by controlling the sliding of the second slide plate, the push plate pushes the handle, and the liquid medicine in the cartridge is injected into the patient's body, without the need for manual pushing force on the second slide plate to control the injection amount of the liquid medicine in the cartridge; the first slide plate can drive the cartridge and the needle of the syringe to move at the same time, and the distance control is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0042] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0043] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model after the rotating rod is rotated;

[0044] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model when extracting medicine;

[0045] Figure 4 for Figure 3 A local enlarged schematic diagram of point I in the middle;

[0046] Figure 5 for Figure 3 A partial enlarged schematic diagram of position II in the middle;

[0047] Figure 6 It is a cross-sectional structural schematic diagram of the utility model;

[0048] Figure 7 It is a three-dimensional structural schematic diagram of the first slide plate and the rotating chuck when assembled in the utility model;

[0049] Figure 8 It is a schematic diagram of the three-dimensional structure of the second slide plate and the clamping plate when assembled in the utility model;

[0050] In the figure, 1, syringe body; 101, cartridge; 102, handle; 103, needle; 2, mounting frame; 201, bearing part; 202, slot; 203, hand-held part; 3, first sliding device; 301, first slide plate; 302, rotating chuck; 303, snap-in slot; 4, second sliding device; 401, second slide plate; 402, push plate; 5, clamping plate; 6, clamping slot; 7, first driving device; 701, first lead screw; 702, first driving motor; 8, second driving device; 801, second lead screw; 802, second driving motor; 803, compression spring; 9, medicine supply device; 901, rotating rod; 902, turntable; 903, medicine charging hole; 10, third driving device; 1001, outer gear sleeve; 1002, gear; 1003, hand wheel; 11, elastic clamp; 12, first control button; 13, second control button. DETAILED DESCRIPTION

[0051] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0052] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0053] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0054] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0055] like Figure 1 to Figure 8 As shown, this embodiment proposes an electric syringe with controllable injection volume, which is used to clamp the cartridge 101 of the syringe body 1 and push the handle 102 of the syringe, including: a mounting frame 2, which has a bearing portion 201; a first sliding device 3, the first sliding device 3 includes: a first slide plate 301, which is slidably arranged on the bearing portion 201, and the first slide plate 301 is used to drive the cartridge 101 to slide; a second sliding device 4, the second sliding device 4 includes: a second slide plate 401, which has a push plate 402, the second slide plate 401 is slidably arranged on the bearing portion 201, and is located next to the first slide plate 301, the upper end of the second slide plate 401 is used to bear the handle 102, and the push plate 402 is used to abut against the end of the handle 102.

[0056] In this embodiment, the bearing part 201 is rectangular and has an inner cavity; the upper end of the bearing part 201 has a slide groove; the first slide plate 301 and the second slide plate 401 both pass through the slide groove and slide in the inner cavity; the operator first places the syringe on the bearing part 201, and the first slide plate 301 supports the cartridge 101 of the syringe, the second slide plate 401 carries the piston of the syringe, the push plate 402 abuts against the handle 102 of the piston, the operator can hold the medicine bottle, make the medicine bottle and the needle 103 of the syringe coaxial, and then slide the first slide plate 301 and the second slide plate 401 at the same time, at this time the syringe as a whole moves to The syringe 401 is moved forward, and when the needle 103 enters the medicine bottle, the operator keeps the first slide plate 301 still and slides the second slide plate 401 backward. At this time, the syringe draws out the liquid medicine in the medicine bottle. When the liquid medicine in the medicine bottle is drawn out, the second slide plate 401 can be slid alone to push the piston forward to discharge the air in the medicine cartridge 101. Then, the first slide plate 301 and the second slide plate 401 can be slid forward at the same time to insert the needle 103 into the patient's body. Then, the second slide plate 401 can be slid alone. According to actual needs, the sliding stroke of the second slide plate 401 can be controlled to push out the liquid medicine in the medicine cartridge 101 in a quantitative manner.

[0057] Optionally, the first sliding device 3 further includes: a rotating chuck 302 having a plurality of engaging grooves 303 arranged in a circumferential array, the rotating chuck 302 being rotatably arranged on one side of the first slide plate 301 , and the engaging grooves 303 being used for engaging the cartridge 101 .

[0058] In this embodiment, the rotating chuck 302 is disc-shaped; the clamping groove 303 is C-shaped, and there are multiple clamping grooves 303, each of which has a different diameter. The operator selects clamping grooves 303 of different diameters to clamp the cartridge 101 according to the diameter of the cartridge 101; the rotating chuck 302 has a rotating shaft, the rotating shaft has an external thread, and the first slide plate 301 has a threaded hole. The rotating chuck 302 is threadedly connected to the first slide plate 301 through the rotating shaft with an external thread and the threaded hole to form a rotation connection, and the length of the rotating shaft is greater than the thickness of the first slide plate 301. When the operator selects the engaging groove 303, the rotating chuck 302 is rotated. When the engaging groove 303 matched with the cartridge 101 is engaged with the cartridge 101, a nut matched with the rotating shaft can be used to threadably connect with the part of the rotating shaft that passes through the first slide plate 301 to fix the rotating chuck 302 and the first slide plate 301, so that the device can adapt to syringes of different diameters, increasing the scope of application of the device. At the same time, the rotating chuck 302 is engaged with the cartridge 101 of the syringe to prevent the cartridge 101 from moving during the process of drawing and pushing the medicine, resulting in inaccurate drawing and pushing of the medicine.

[0059] Optionally, it further includes: a locking plate 5 , which is arranged on one side of the push plate 402 , and a locking groove 6 is formed between the locking plate 5 and the push plate 402 , and the locking groove 6 is used to lock the handle 102 .

[0060] In this embodiment, the locking disk 5 and the push plate 402 are both in the form of discs, and the locking disk 5 has an avoidance groove. The operator can place the syringe on the device from above the device. During this process, the handle 102 enters from above the avoidance groove into the locking groove 6 between the locking disk 5 and the push plate 402. The setting of the locking disk 5 enables the syringe to be stably fixed on the device, reducing the occurrence of the syringe being detached from the device when the first slide plate 301 and the second slide plate 401 slide. At the same time, the locking disk 5 and the push plate 402 fix the handle 102 in the locking groove 6, allowing the operator to be more precise when performing liquid extraction and liquid pushing operations.

[0061] Optionally, it also includes: a first driving device 7, used to drive the first sliding device 3 to slide, the first driving device 7 includes: a first screw 701, which is rotatably arranged in the bearing part 201 and is threadedly connected to the first slide plate 301; a first driving motor 702, which is arranged in the bearing part 201 and is used to drive the first screw 701 to rotate.

[0062] In this embodiment, the first lead screw 701 is rotatably arranged on the left side of the inner cavity of the bearing part 201, and the first drive motor 702 is arranged on the left side of the inner cavity of the bearing part 201; the operator drives the first sliding device 3 to slide through the first drive device 7, and its working form is: the operator first operates the first drive motor 702, rotates the first lead screw 701, slides the first slide plate 301, slides the cartridge 101 forward or backward, and moves the needle 103 closer to or away from the medicine bottle; the end of the first lead screw 701 away from the first drive motor 702 has a first boss, and the first boss is disc-shaped. The setting of the first boss can prevent the first slide plate 301 from detaching from the first lead screw 701.

[0063] Optionally, it also includes: a second driving device 8, used to drive the second sliding device 4 to slide, the second driving device 8 includes: a second screw 801, which is rotatably set in the bearing part 201 and is threadedly connected to the second slide plate 401; a second driving motor 802, which is set in the bearing part 201 and is used to drive the second screw 801 to rotate.

[0064] In this embodiment, the second driving device 8 is arranged in the inner cavity of the bearing portion 201 and is opposite to the first driving device 7; the length of the second lead screw 801 is longer than that of the first lead screw 701, and the end of the second lead screw 801 away from the second driving motor 802 has a second boss, and the second boss has the same shape as the first boss. The setting of the second boss prevents the second slide plate 401 from detaching from the second lead screw 801.

[0065] Optionally, the second driving device 8 further includes: a compression spring 803 , one end of which acts on one side of the second slide plate 401 , and the other end of which acts on the bearing portion 201 , for providing a buffering force when the handle 102 is pushed or pulled.

[0066] In this embodiment, when the operator draws medicine from the medicine bottle, the compression spring 803 puts force on the second slide plate 401, so that the threaded connection between the second slide plate 401 and the second screw 801 is more stable, the shaking is reduced, and the buffering force when the second slide plate 401 slides backward is increased, and the second slide plate 401 is prevented from being directly drawn out of the cartridge 101, so that the control accuracy when drawing medicine is more accurate; when the operator pushes the medicine liquid in the cartridge 101, the compression spring 803 puts force on the second slide plate 401, so that the threaded connection between the second slide plate 401 and the second screw 801 is more stable, and the sliding of the second slide plate 401 when sliding is reduced, which is beneficial to improving the control accuracy when injecting and pushing medicine.

[0067] Optionally, it also includes: a medicine supply device 9, which includes: a rotating rod 901, one end of which is rotatably set on one side of the bearing part 201; a turntable 902, which is rotatably set on the other end of the rotating rod 901, and the turntable 902 has a plurality of medicine loading holes 903 arranged in a circumferential array, and the medicine loading holes 903 are used to clamp the medicine bottle; after the rotating rod 901 is rotated, the medicine loading holes 903 are used to be opposite to the needle 103 on the syringe body 1.

[0068] In this embodiment, when the operator draws medicine, the operator clamps the medicine bottle in the medicine loading hole 903, and then the operator rotates the rotating rod 901 forward to rotate the rotating rod 901 to the left side of the bearing part 201, and the rotating rod 901 is parallel to the horizontal ground. At this time, the turntable 902 is facing the left side of the bearing part 201, and the medicine loading hole 903 and the syringe axis are at the same height. One syringe corresponds to one turntable 902, and then the syringe is slid forward as a whole to make the needle 103 pierce the medicine bottle to draw medicine. When the liquid medicine in a medicine bottle is drawn out, the syringe is moved backward as a whole to make the needle 1 03 away from the medicine, and then manually rotate the turntable 902 to make the medicine bottle and needle 103 on the next clamping slot 6 face each other, and then use the same method to extract the medicine in the next medicine bottle. When the medicine in all the medicine bottles on the turntable 902 is extracted, rotate the rotating rod 901 backward. At this time, the rotating rod 901 is located on the right side of the bearing part 201. At this time, the medicine extraction process is completed and the operator can proceed to the next step; the setting of the rotating chuck 302 makes the axial center heights of syringes of different diameters consistent, so that the needles 103 of syringes of different diameters can be aligned with the loading hole 903.

[0069] Optionally, the side of the bearing portion 201 has two slots 202 , and the two slots 202 and the rotating rod 901 are located on the same side. After the rotating rod 901 rotates, it engages with any one of the two slots 202 .

[0070] In this embodiment, the card slot 202 is U-shaped, and the card slot 202 is adapted to the thickness of the rotating rod 901. The card slot 202 is used to fix the rotating rod 901 to prevent the rotating rod 901 from shaking and contacting the patient during operation, thereby improving the safety of the device.

[0071] Optionally, it also includes: a third driving device 10, used to drive the turntable 902 to rotate, and the third driving device 10 includes: an outer gear sleeve 1001, which is sleeved on the outer periphery of the turntable 902; a gear 1002, which is rotatably set on the rotating rod 901 and meshingly connected with the outer gear sleeve 1001; a hand wheel 1003, which is rotatably set on the rotating rod 901 and used to drive the gear 1002 to rotate; an elastic clip 11, and an elastic clip 11 is set in each charging hole 903, and the elastic clip 11 is used to be clamped with the medicine bottle.

[0072] In this embodiment, when the operator is performing the medicine extraction process, the hand wheel 1003 can be used to control the rotation of the gear 1002. Since the gear 1002 and the outer gear sleeve 1001 are meshed and linked, the gear 1002 drives the outer gear sleeve 1001 to rotate, so that the turntable 902 rotates, and the medicine in each medicine bottle on the turntable 902 is extracted; the setting of the elastic clip 11 makes the clamping fit between the medicine bottle and the medicine loading hole 903 more stable, thereby reducing the occurrence of the medicine bottle falling from the medicine loading hole 903.

[0073] Optionally, the mounting frame 2 also has a hand-held portion 203, which is located below the bearing portion 201; and also includes: a first control button 12, which is arranged on the hand-held portion 203 and is communicatively connected to the first drive motor 702; a second control button 13, which is arranged on the hand-held portion 203 and is communicatively connected to the second drive motor 802; the first control button 12 and the second control button 13 are respectively used to control the operation of the first drive motor 702 and the second drive motor 802.

[0074] In this embodiment, the hand-held portion 203 is located below the carrying portion 201 and is vertically arranged in the middle of the carrying portion 201. The arrangement of the hand-held portion 203 makes the device easy to take; the first control button 12 and the second control button 13 respectively control the operation of the first drive motor 702 and the second drive motor 802.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An electric syringe capable of controlling the injection volume, used for clamping the cartridge (101) of the syringe body (1) and pushing the handle (102) of the syringe, characterized in that: include: A mounting frame (2) having a bearing portion (201); A first sliding device (3), wherein the first sliding device (3) comprises: A first slide plate (301) is slidably arranged on the bearing portion (201), and the first slide plate (301) is used to drive the cartridge (101) to slide; A second sliding device (4), wherein the second sliding device (4) comprises: The second slide plate (401) has a push plate (402). The second slide plate (401) is slidably arranged on the bearing portion (201) and is located beside the first slide plate (301). The upper end of the second slide plate (401) is used to bear the handle (102), and the push plate (402) is used to abut against the end of the handle (102).

2. The electric injector with controllable injection volume according to claim 1, characterized in that: The first sliding device (3) further comprises: The rotating chuck (302) has a plurality of engaging grooves (303) arranged in a circumferential array. The rotating chuck (302) is rotatably arranged on one side of the first slide plate (301), and the engaging grooves (303) are used to engage the cartridge (101).

3. The electric injector with controllable injection volume according to claim 1, characterized in that: Also includes: A locking plate (5), the locking plate (5) being arranged on one side of the push plate (402), a locking groove (6) being formed between the locking plate (5) and the push plate (402), the locking groove (6) being used for locking the handle (102).

4. The electric injector capable of controlling injection volume according to claim 2, characterized in that: Also includes: A first driving device (7) is used to drive the first sliding device (3) to slide, and the first driving device (7) comprises: A first lead screw (701) is rotatably disposed in the bearing portion (201) and is threadably connected to the first slide plate (301); A first driving motor (702) is disposed in the bearing portion (201) and is used to drive the first lead screw (701) to rotate.

5. The electric injector capable of controlling injection volume according to claim 4, characterized in that: Also includes: A second driving device (8) is used to drive the second sliding device (4) to slide, and the second driving device (8) comprises: A second lead screw (801) is rotatably disposed in the bearing portion (201) and is threadably connected to the second slide plate (401); The second driving motor (802) is arranged in the bearing portion (201) and is used to drive the second lead screw (801) to rotate.

6. The electric injector capable of controlling injection volume according to claim 5, characterized in that: The second driving device (8) further comprises: A compression spring (803) has one end acting on one side of the second slide plate (401) and the other end acting on the bearing portion (201), and is used to provide a buffering force when the handle (102) is pushed or pulled.

7. The electric injector capable of controlling injection volume according to claim 1, characterized in that: Also includes: A medicine supply device (9), the medicine supply device (9) comprising: A rotating rod (901), one end of which is rotatably disposed on one side of the bearing portion (201); A rotating disk (902) is rotatably arranged at the other end of the rotating rod (901), and the rotating disk (902) has a plurality of charging holes (903) arranged in a circumferential array, and the charging holes (903) are used to clamp a medicine bottle; After the rotating rod (901) rotates, the medicine loading hole (903) is used to face the needle (103) on the syringe body (1).

8. The electric injector capable of controlling injection volume according to claim 7, characterized in that: The side surface of the bearing portion (201) has two slots (202), and the two slots (202) are located on the same side as the rotating rod (901). After the rotating rod (901) rotates, it is engaged with any one of the two slots (202).

9. The electric injector capable of controlling injection volume according to claim 8, characterized in that: Also includes: A third driving device (10) is used to drive the rotating disk (902) to rotate, and the third driving device (10) comprises: An outer gear sleeve (1001) is sleeved on the outer circumference of the rotating disk (902); A gear (1002) is rotatably disposed on the rotating rod (901) and meshingly connected with the outer gear sleeve (1001); A hand wheel (1003) is rotatably mounted on the rotating rod (901) and is used to drive the gear (1002) to rotate; An elastic clamp (11), wherein each of the medicine charging holes (903) is provided with an elastic clamp (11), and the elastic clamp (11) is used for clamping with a medicine bottle.

10. The electric injector capable of controlling injection volume according to claim 5, characterized in that: The mounting frame (2) further comprises a hand-held portion (203), wherein the hand-held portion (203) is located below the bearing portion (201); and further comprises: A first control button (12), arranged on the handheld portion (203) and communicatively connected to the first drive motor (702); A second control button (13), arranged on the handheld portion (203) and communicatively connected to the second drive motor (802); The first control button (12) and the second control button (13) are used to control the operation of the first drive motor (702) and the second drive motor (802) respectively.

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