Radiotherapy protective agent smearing instrument

Abstract

The invention discloses a radiotherapy protective agent smearing instrument, relates to the technical field of medical instruments, is mainly used for uniformly smearing a protective agent on the skin surface of a patient, and is particularly suitable for parts with complex skin forms, such as the head and the neck. The device comprises a grab handle, a coating assembly, a feeding assembly and a driving assembly. The grab handle is of a hollow structure, the bottom of the grab handle is an open end, and the coating assembly is arranged at the end of the grab handle and comprises a coating piece made of flexible silica gel. When the coating tool is used, an operator can adjust the shape of the coating piece through the micro air pump, it is ensured that the coating piece is well attached to the skin, and the problem that due to the fixed shape of a traditional coating tool, a protective agent is stacked or missed to be coated is solved. The protective agent is uniformly coated through rotation and sliding of the coating piece, meanwhile, skin absorption is promoted through friction massage, and the treatment effect is enhanced. The design can flexibly cope with the form change of different skin parts, improves the coating effect and operation experience, and is especially suitable for skin protection in the treatment process of radiotherapy and the like.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a radiotherapy protective agent application device. Background Art

[0002] Radiotherapy is one of the core technologies for the treatment of malignant tumors. Cancer patients need to receive radiotherapy. However, while high-energy rays kill tumor cells, they also cause damage to skin tissue in the irradiated area. Most patients will experience radiation dermatitis, which can cause ulcers or even interruption of treatment in severe cases. Medical protective agents can reduce the incidence of skin damage through film-forming isolation, moisturizing and repairing functions, but their protective effect is highly dependent on the uniform coating and targeted bonding capabilities of the device for the protective agent. There are many existing coating devices such as hand-held scraper-type applicators, which use a single-plane silicone head and rely on manual pressure to complete the coating, roller-type coating devices, which distribute the protective agent by rotating a micro roller, and pre-formed sponge patches, which pre-load the protective agent on a non-woven fabric of a specific shape; However, flat scrapers and rollers may not be able to effectively fit recessed areas of the human body, such as the neck and groin, and may result in drug accumulation or incomplete coverage.

[0003] To this end, we propose a radiotherapy protective agent application device. Summary of the invention

[0004] The purpose of the present invention is to provide a radiotherapy protective agent application device to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: a radiotherapy protective agent application device, comprising: A handle, wherein the handle is a hollow structure, and the bottom of the handle is an open end; A coating assembly, the coating assembly is arranged at the end of the handle, and the coating assembly comprises: A shell, the shell is cylindrical, and the upper and lower ends of the shell are open; A coating member, the edge of which is fixedly connected to the outer wall of the shell, the coating member is made of a flexible material, the cross section of the coating member is arc-shaped, a through hole is provided on the handle, a micro air pump is provided on the handle, an air pipe on the micro air pump is connected to the through hole on the handle, and the micro air pump expands or contracts the coating member by inflating or exhausting air; A feeding assembly, the feeding assembly is arranged in the handle, and the feeding assembly is used to squeeze the protective agent out from the surface of the coating member; A driving assembly is used to drive the shell to rotate.

[0005] Preferably, the feeding assembly comprises: A material rod 1, wherein the material rod 1 is arranged in the middle of the coating member, the bottom of the material rod 1 is fixedly connected to the coating member, and the coating member is a hollow structure; A hose, which is arranged in the coating member and arranged in a circumferential array about the material rod, and a plurality of material discharging pipes are opened on the hose, and the material discharging pipes pass through the bottom of the coating member and are connected to the outside; The second material rod is rotatably connected with the first material rod, the handle is provided with a slide groove, the two ends of the material rod are fixedly connected with a slider which can slide in the slide groove, and the slider is provided with a feeding port for feeding.

[0006] Preferably, the coating assembly further comprises: The limiting plate is fixedly connected to the inner wall of the shell, the cross section of the limiting plate is arc-shaped, and a ventilation groove is opened through the limiting plate.

[0007] Preferably, a cylinder is fixedly connected to the middle part of the limit plate, and the material rod 1 is slidably connected to the cylinder. A limit groove is provided on the material rod 1, and the limit groove is arc-shaped, and the extension lines of both ends are collinear with the material rod 1. A limit block is fixedly connected to the cylinder, and the limit block is arranged in the limit groove.

[0008] Preferably, grooves are provided on both the upper and lower surfaces of the coating member, and a plurality of grooves are provided in a circumferential array about the coating member.

[0009] Preferably, the bottom of the handle is rotatably connected to a rotating shell, and the rotating shell is threadedly connected to the housing; The bearing component is sleeved on one end of the material rod, and an elastic component is fixedly connected to the outer wall of the bearing component, and the elastic component is clamped with the second end of the material rod.

[0010] Preferably, the driving assembly comprises: A micro motor, wherein the micro motor housing is fixedly connected to the inside of the handle, the inner wall of the rotating shell is provided with teeth, the rotating shell is provided with a gear 1 meshing with the teeth, a connecting rod is fixedly connected to the middle of the gear 1, the connecting rod is rotatably connected to the handle, the connecting rod is fixedly connected to the end away from the gear 1 with the gear 2, and the end of the internal rotating shaft of the micro motor is fixedly connected to the gear 3 meshing with the gear 2.

[0011] The present invention has at least the following beneficial effects: The user can flexibly adjust the shape of the coating member according to the actual shape of the skin of different parts of the patient, thereby increasing the contact area between the coating member and the skin, and ensuring that the feeding component can extrude the protective agent evenly, so that the protective agent can achieve an ideal coating effect on the patient's skin; By connecting the feed port on the slider with the discharge port of a peristaltic pump (the peristaltic pump belongs to the prior art and will not be described in detail here) filled with the protective agent, the protective agent is automatically supplied. When the peristaltic pump is started, the protective agent is pumped in through the feed port, and successively enters the material rod one along the material rod two, and then the material rod one disperses the protective agent into the hose, and finally is evenly discharged to the surface of the coating part through the discharge pipe; When the micro air pump starts to extract the gas in the shell, the coating piece will shrink back into the shell accordingly. At this time, the limit plate with an arc design and close fit to the coating piece can impose a certain restriction on its shape during the shrinkage process of the coating piece, thereby preventing the coating piece from being excessively sunken due to excessive gas extraction. In this way, even under extreme operation, it can ensure that the shrinkage shape of the coating piece will not deviate from expectations, so that it can still maintain a good fit with the raised parts of the skin, ensuring that the protective agent can be evenly and effectively covered on the patient's skin. Through this design, not only the adaptability and stability of the device in various usage scenarios are improved, but also a more reliable technical guarantee is provided for the uniform coating of the protective agent. By designing and opening grooves on the upper and lower surfaces of the coating, when the coating is subjected to a pulling force toward the center, these grooves can automatically close, thereby playing a compensating and regulating role, effectively offsetting the uneven deformation caused by pulling, further reducing the generation of surface wrinkles, and keeping the coating flatter and smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of another viewing angle of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the coating assembly of the present invention; Figure 4 It is a schematic diagram of the structure of the limit block of the present invention; Figure 5 This is a schematic diagram of the hose structure of the present invention; Figure 6 This is a structural schematic diagram of a material rod of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 8 This is a schematic diagram of the concave structure of the coating member of the present invention; Fig. 9 This is a schematic diagram of the planar structure of the coating member of the present invention; Fig.10 This is a schematic diagram of the convex structure of the coating member of the present invention; Fig.11 It is a schematic diagram of the structure of the leak plate of the present invention.

[0013] In the figure: 10, handle; 20, coating component; 21, shell; 22, coating part; 23, through hole; 24, micro air pump; 30, feeding component; 40, driving component; 31, material rod one; 32, hose; 33, discharging pipe; 34, material rod two; 36, slide groove; 37, slider; 35, feed port; 211, limit plate; 212, ventilation groove; 221, cylinder; 222, limit groove; 223, limit block; 231, groove; 51, rotating shell; 52, bearing part; 53, elastic part; 41, micro motor; 42, teeth; 43, gear one; 44, connecting rod; 45, gear two; 46, gear three. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Example 1: Please refer to Figure 1-11 The present invention provides a technical solution: a radiotherapy protective agent application device, comprising: A handle 10, wherein the handle 10 is a hollow structure with an open bottom; The coating assembly 20 is disposed at the end of the handle 10 and includes: A housing 21, wherein the housing 21 is cylindrical and has open ends at the top and bottom; A coating member 22, the edge of which is fixedly connected to the outer wall of the shell 21, the coating member 22 is made of a flexible material, the coating member 22 is made of silicone, the cross section of the coating member 22 is arc-shaped, a through hole 23 is opened on the handle 10, a micro air pump 24 is provided on the handle 10, an air pipe on the micro air pump 24 is connected to the through hole 23 on the handle 10, and the micro air pump 24 expands or contracts the coating member 22 by pumping or exhausting air; A feeding assembly 30, wherein the feeding assembly 30 is disposed in the handle 10 and is used to extrude the protective agent from the surface of the coating member 22; A driving assembly 40, wherein the driving assembly 40 is used to drive the housing 21 to rotate; It should be noted that when using the device, the user should first hold the handle 10 and accurately align the coating assembly 20 with the skin surface of the area to be coated. Depending on the different forms of the skin, corresponding gas control operations can be taken: Concave part of the skin: Start the micro air pump 24 to pump gas into the housing 21 through the through hole 23 on the handle 10, so that the coating member 22 is fully expanded and the cross section presents a convex arc shape; Flat part of the skin: only part of the gas needs to be pumped in to keep the coating 22 in a nearly flat state to ensure good fit with the skin; Skin protrusions: The gas in the shell 21 is pumped out to form a certain negative pressure, so that the coating member 22 is retracted back into the shell 21 .

[0016] This design allows the user to flexibly adjust the shape of the coating member 22 according to the actual shape of the skin of different parts of the patient, thereby increasing the contact area between the coating member 22 and the skin, and ensuring that the supply assembly 30 can extrude the protective agent evenly, so that the protective agent can achieve an ideal coating effect on the patient's skin; It is worth noting that the user can flexibly adjust the shape of the coating member 22 according to the actual shape of the skin of different parts of the patient, thereby increasing the contact area between the coating member 22 and the skin, and ensuring that the supply assembly 30 can extrude the protective agent evenly, so that the protective agent can achieve an ideal coating effect on the patient's skin; For example, for the head and neck areas that are commonly used for radiotherapy (such as nasopharyngeal carcinoma treatment), the patient's cheekbones, mandibles and other raised parts coexist with the sunken area of ​​the neck. The operator can quickly adjust the concave and convex shape of the coating piece 22 through the air pump to ensure the synchronous adaptation and coating of the raised part of the Adam's apple, avoiding the accumulation or missing coating of the protective agent caused by the fixed shape of the traditional brush head.

[0017] . In addition, it should be noted that the driving assembly 40 plays a key role in the entire operation process: it drives the housing 21 to rotate smoothly, thereby causing the coating member 22 to rotate synchronously; at the same time, the handle 10 also drives the coating member 22 to slide along the patient's skin surface when moving. In this way, not only can the protective agent be evenly applied, but the friction and massage effect between the coating member 22 and the skin can also promote the skin's absorption of the protective agent. In actual operation, the user can adjust the amount and speed of the pumped gas in time according to the skin condition to ensure that the expected coating and absorption effect is achieved, thereby improving the overall use experience and treatment effect.

[0018] Further as Figure 5 , Figure 6 and Figure 7 As shown, it is worth to explain in detail that the feeding assembly 30 includes: A material rod 31, wherein the material rod 31 is disposed in the middle of the coating member 22, and the bottom of the material rod 31 is fixedly connected to the coating member 22, and the coating member 22 is a hollow structure; A hose 32, the hose 32 is arranged in the coating member 22 and arranged in a circumferential array about the material rod 31, and a plurality of material discharging pipes 33 are opened on the hose 32, and the material discharging pipes 33 pass through the bottom of the coating member 22 and are connected to the outside; The second material rod 34, the first material rod 31 is rotatably connected to the second material rod 34, the handle 10 is provided with a slide groove 36, the end of the second material rod 34 is fixedly connected with a slider 37 that can slide in the slide groove 36, and the slider 37 is provided with a feeding port 35 for feeding; It should be noted that the automatic supply of the protective agent is achieved by connecting the feed port 35 on the slider 37 with the discharge port of a peristaltic pump (the peristaltic pump belongs to the prior art and will not be described in detail here). When the peristaltic pump is started, the protective agent is pumped in through the feed port 35, and sequentially enters the material rod 1 31 along the material rod 2 34, and then the material rod 1 31 disperses the protective agent into the hose 32, and finally is evenly discharged to the surface of the coating member 22 through the discharge pipe 33; In addition, during the protective agent coating process, the user can also flexibly control the relative positions of the material rod 1 31 and the material rod 2 34 inside the handle 10 by adjusting the position of the slider 37. In this way, not only can the shape of the coating member 22 be adjusted to better adapt to the different curves of the skin surface, but also the distribution effect of the protective agent can be further optimized, thereby achieving more uniform and more effective coating. This design fully considers the convenience and variability in actual use, and provides users with higher operational flexibility and better use experience. For example, when a large area of ​​the chest and abdomen is radiotherapy (such as postoperative radiotherapy for breast cancer), the length of the material rod can be extended by adjusting the slider 37 to make the coating member 22 form a wide flat state. With the continuous feeding of the automatic peristaltic pump, a large area can be evenly covered in a short time, which significantly improves the work efficiency of medical staff, saves time and reduces the waste of medicine compared to traditional manual application.

[0019] Further as Figure 2 , Figure 3 and Figure 4 As shown, it is worth noting that the coating assembly 20 further includes: A limit plate 211, the limit plate 211 is fixedly connected to the inner wall of the housing 21, the limit plate 211 has an arc-shaped cross section, and a venting groove 212 is formed through the limit plate 211; It should be noted that the venting groove 212 on the limiting plate 211 facilitates the passage of gas through the limiting plate 211; It is worth noting that when the micro air pump 24 begins to extract the gas in the shell 21, the coating member 22 will shrink back into the shell 21 accordingly. At this time, the limiting plate 211 with an arc design and tightly fitting with the coating member 22 can impose a certain restriction on the shape of the coating member 22 during the shrinkage process, thereby preventing the coating member 22 from being excessively sunken due to excessive gas extraction. In this way, even under extreme operations, it can be ensured that the contracted shape of the coating member 22 will not deviate from expectations, so that it can still maintain a good fit with the raised parts of the skin, ensuring that the protective agent can be evenly and effectively covered on the patient's skin. Through this design, not only the adaptability and stability of the equipment in various usage scenarios are improved, but also a more reliable technical guarantee is provided for the uniform coating of the protective agent.

[0020] Further as Figure 5 As shown, it is worth specifically explaining that a cylinder 221 is fixedly connected to the middle of the limiting plate 211, the material rod 31 is slidably connected to the cylinder 221, a limiting groove 222 is provided on the material rod 31, the limiting groove 222 is arc-shaped, and the extension lines of both ends thereof are collinear with the material rod 31, a limiting block 223 is fixedly connected to the cylinder 221, and the limiting block 223 is arranged in the limiting groove 222; It should be noted that when the micro air pump 24 is started and the pressure in the shell 21 is adjusted by pumping in or out gas, when the coating member 22 tends to a planar state, the material rod 31 will be driven to undergo a corresponding displacement. At the same time, the limiting groove 222 provided on the material rod 31 rotates under the guidance of the limiting block 223, so that the material rod 31 applies a pulling force to the coating member 22 along its center part. This design ensures that when the coating member 22 reaches a planar state, the surface can be evenly stressed and flattened, thereby eliminating wrinkles or irregularities that may occur on the surface. Finally, when the coating member 22 presents a planar state, its surface will be smoother and more regular, providing conditions for the uniform coating of the protective agent, ensuring that the protective agent can be evenly covered on the patient's skin surface, thereby achieving a better therapeutic effect.

[0021] Further as Fig.11 As shown, it is worth to explain in detail that the coating member 22 has grooves 231 on both the upper and lower surfaces, and the grooves 231 are arranged in a plurality of arrays around the circumference of the coating member 22; It should be noted that by designing and opening grooves 231 on the upper and lower surfaces of the coating member 22, when the coating member 22 is subjected to a pulling force toward the center, these grooves 231 can automatically close, thereby playing a compensating and regulating role, effectively offsetting the uneven deformation caused by pulling, further reducing the generation of surface wrinkles, and keeping the coating member 22 in a more flat and smooth state.

[0022] In addition, it is worth noting that when the coating member 22 is concave due to reasons such as gas pumping out, the groove 231 at its edge can significantly increase local air circulation, effectively preventing the coating member 22 from being excessively adsorbed on the skin surface due to negative pressure. Such a design not only ensures that the coating member 22 can maintain a suitable shape in various states, but also helps to achieve uniform distribution of the protective agent on the skin surface, thereby improving the overall coating effect and usage experience.

[0023] Further as Figure 7 As shown, it is worth to explain in detail that the bottom of the handle 10 is rotatably connected with a rotating shell 51, and the rotating shell 51 is threadedly connected with the housing 21; A bearing member 52, wherein the bearing member 52 is sleeved on the end of the material rod 1 31, and an elastic member 53 is fixedly connected to the outer wall of the bearing member 52, and the elastic member 53 is clamped with the material rod 2 34; It should be noted that in order to ensure that the device can be thoroughly cleaned after each use and avoid the risk of cross infection, the user can disassemble and clean the device according to the following steps: First, after the operation is completed, the user only needs to press the rotating shell 51 and rotate the shell 21 at the same time to separate the shell 21 from the handle 10; then, the elastic member 53 on the material rod 1 31 and the material rod 2 34 are easily detached. In this way, each major component can be disassembled separately, which is convenient for thorough cleaning and disinfection of the internal channels and contact surfaces. This design not only greatly simplifies the cleaning operation, but also effectively removes the residual protective agent, ensuring that the device is in a safe and hygienic state when it is used next time, thereby effectively preventing cross infection problems caused by residual contamination.

[0024] Further as Figure 7 As shown, it is worth to explain in detail that the driving assembly 40 includes: A micro motor 41, wherein the shell of the micro motor 41 is fixedly connected to the inside of the handle 10, the inner wall of the rotating shell 51 is provided with teeth 42, the rotating shell 51 is provided with a gear 1 43 meshing with the teeth 42, a connecting rod 44 is fixedly connected to the middle of the gear 1 43, the connecting rod 44 is rotatably connected to the handle 10, a gear 2 45 is fixedly connected to the end of the connecting rod 44 away from the gear 1 43, and a gear 3 46 meshing with the gear 2 45 is fixedly connected to the end of the internal rotating shaft of the micro motor 41; It should be noted that when the micro motor 41 is started, the gear 2 45 connected to the end of the internal shaft starts to rotate at a high speed, and drives the gear 3 46 to rotate synchronously. The gear 3 46 transmits the rotational power to the gear 1 43 through the connecting rod 44 firmly connected thereto, so that it runs smoothly; then, the gear 1 43 drives the teeth 42 thereon to rotate continuously. Finally, the movement of the teeth 42 causes the rotating shell 51 to rotate, thereby driving the shell 21 and the coating member 22 assembled thereon to achieve uniform and stable rotation.

[0025] This transmission mechanism is ingeniously designed and transmits power layer by layer, so that the coating member 22 can evenly distribute the protective agent during the rotation process, which not only improves the uniformity of the protective agent coating, but also helps the protective agent to be better absorbed by the skin through the friction generated by the rotation, thereby improving the overall treatment effect. In this way, the entire system shows efficient and stable performance in operation, providing users with a more convenient and accurate coating experience.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A radiotherapy protective agent application device, characterized in that: include: A handle (10), the handle (10) being of a hollow structure with an open end at the bottom; A coating assembly (20), the coating assembly (20) being arranged at the end of the handle (10), the coating assembly (20) comprising: A shell (21), the shell (21) is cylindrical, and the upper and lower ends of the shell (21) are both open; A coating member (22), the edge of which is fixedly connected to the outer wall of the shell (21), the coating member (22) being made of a flexible material, the cross section of which is arc-shaped, the handle (10) being provided with a through hole (23), the handle (10) being provided with a micro air pump (24), the air pipe on the micro air pump (24) being connected to the through hole (23) on the handle (10), the micro air pump (24) expanding or contracting the coating member (22) by pumping or exhausting air; A material supply assembly (30), the material supply assembly (30) being arranged in the handle (10), and the material supply assembly (30) being used to extrude the protective agent from the surface of the coating member (22); A driving assembly (40), wherein the driving assembly (40) is used to drive the housing (21) to rotate.

2. A radiotherapy protective agent application device according to claim 1, characterized in that: The feeding assembly (30) comprises: A material rod (31), the material rod (31) being arranged in the middle of the coating member (22), the bottom of the material rod (31) being fixedly connected to the coating member (22), and the coating member (22) being a hollow structure; A hose (32), the hose (32) being arranged in the coating member (22) and arranged in a circular array about the material rod (31), the hose (32) being provided with a plurality of material discharging pipes (33), the material discharging pipes (33) penetrating the bottom of the coating member (22) and being in communication with the outside; The second material rod (34) is rotatably connected to the first material rod (31), the handle (10) is provided with a slide groove (36), the end of the second material rod (34) is fixedly connected with a slider (37) that can slide in the slide groove (36), and the slider (37) is provided with a feed port (35) for feeding.

3. A radiotherapy protective agent coating device according to any one of claims 1 or 2, characterized in that: The coating assembly (20) further comprises: A limit plate (211), the limit plate (211) is fixedly connected to the inner wall of the shell (21), the limit plate (211) has an arc-shaped cross section, and a ventilation groove (212) is provided through the limit plate (211).

4. A radiotherapy protective agent coating device according to claim 3, characterized in that: A cylinder (221) is fixedly connected to the middle of the limiting plate (211), the material rod (31) is slidably connected to the cylinder (221), a limiting groove (222) is provided on the material rod (31), the limiting groove (222) is arc-shaped, and the extension lines of both ends thereof are collinear with the material rod (31), a limiting block (223) is fixedly connected to the cylinder (221), and the limiting block (223) is arranged in the limiting groove (222).

5. A radiotherapy protective agent application device according to claim 4, characterized in that: The coating member (22) is provided with grooves (231) on both the upper and lower surfaces, and a plurality of grooves (231) are provided in a circular array around the coating member (22).

6. A radiotherapy protective agent application device according to claim 2, characterized in that: A rotating shell (51) is rotatably connected to the bottom of the handle (10), and the rotating shell (51) is threadedly connected to the housing (21); A bearing member (52) is sleeved on an end of the first material rod (31), an outer wall of the bearing member (52) is fixedly connected to an elastic member (53), and the elastic member (53) is clamped with the second material rod (34).

7. A radiotherapy protective agent application device according to claim 6, characterized in that: The driving assembly (40) comprises: A micro motor (41), wherein the housing of the micro motor (41) is fixedly connected to the inside of the handle (10), the inner wall of the rotating shell (51) is provided with teeth (42), the rotating shell (51) is provided with a gear 1 (43) meshing with the teeth (42), the middle of the gear 1 (43) is fixedly connected with a connecting rod (44), the connecting rod (44) is rotatably connected to the handle (10), the end of the connecting rod (44) away from the gear 1 (43) is fixedly connected with a gear 2 (45), and the end of the internal rotating shaft of the micro motor (41) is fixedly connected with a gear 3 (46) meshing with the gear 2 (45).

Images