Dustproof medical lifting device

Abstract

The embodiment of the application provides a dustproof medical lifting device, which comprises a lifting assembly capable of being telescoped; a fixing cylinder having a mounting cavity and an opening provided along the length direction of the fixing cylinder, the opening being communicated with the mounting cavity, and the lifting assembly being mounted in the mounting cavity; a mounting frame partially extending into the mounting cavity from the opening and being fixedly connected with the lifting assembly; a dustproof assembly comprising a dustproof belt, an upper roller set and a lower roller set, the upper roller set and the lower roller set being arranged in the mounting cavity, the dustproof belt being arranged around the upper roller set and the lower roller set and capable of covering the opening, the mounting frame being further fixedly connected with the dustproof belt, and the dustproof belt being moved around the roller set along with the up-down movement of the mounting frame; the upper roller set and the lower roller set each comprising at least three rollers, so that the bending angle of the dustproof belt is obtuse; and a tensioning mechanism being capable of moving at least one roller, so as to adjust the tightness of the dustproof belt. The dustproof medical lifting device in the embodiment can solve the problems of dustproof, cleaning and disinfection of the medical lifting device.

Description

Technical Field

[0001] The embodiments of this application belong to the field of medical device lifting and mobility applications, and particularly relate to the field of dustproof ECMO lifting. Background Technology

[0002] In clinical practice, extracorporeal membrane oxygenation (ECMO) is used to provide continuous extracorporeal respiratory and circulatory support for critically ill patients with severe cardiopulmonary failure, thus buying precious time for emergency treatment. The core components of ECMO are an artificial lung (also known as a membrane lung or oxygenator) and an artificial heart-lung machine (also known as a blood pump or power pump). Due to the increasing sophistication of artificial lung and heart technologies, ECMO can be maintained for longer periods, providing the necessary foundation for its application in the treatment of cardiopulmonary failure patients. This is especially true for patients with severe cardiopulmonary failure caused by COVID-19; if ECMO can sustain life for several days, dozens of days, or even longer, it will save many more lives.

[0003] The existing ECMO equipment has large gaps in its operation and support structure due to the design of the lifting function. During use, dust and debris can easily enter through these gaps, causing dust and foreign objects to accumulate inside the equipment. This makes cleaning and disinfection difficult or affects the lifting function of the ECMO equipment.

[0004] Existing dustproof devices are mostly designed as pleated curtains (with pleated strips of cloth or non-woven fabric) or steel strips or PU strips. For example, patent CN115323911A, a modular bridge expansion joint, uses pleated curtains as dustproof devices. The pleats in the grooves are prone to accumulating dust and dirt, making it inconvenient to clean and disinfect. In some cases, it is even necessary to remove the dustproof device or choose to replace it with a new one. This not only makes cleaning inconvenient but also increases the cost of use.

[0005] Existing technologies employ dustproof belts that rotate and wrap around a rolling roller for dust prevention. For example, patent CN116113195A describes an oil well control cabinet with a self-cleaning function, which uses an electric device for dust removal and self-cleaning. However, its structure is complex and it cannot be used without power. Another example is patent CN115674178A, which describes a pneumatic telescopic mechanism and a pneumatic robot. In this latter case, the dustproof belt is bent at a 90-degree angle, resulting in significant stress on the steel belt at the bend. This leads to high friction between the steel belt and the roller, causing noise problems.

[0006] In the field of ECMO, the lifting device houses core components of the ECMO system, such as artificial lungs and artificial hearts. During clinical use, height adjustments are frequently required, necessitating extremely high reliability of the lifting device to prevent any malfunctions from disrupting its operation. Therefore, a highly reliable dustproof device is essential to prevent dust from entering and affecting the lifting mechanism. Furthermore, the artificial heart, artificial lungs, and tubing within the lifting platform contain blood drawn directly from the patient. Consequently, the surrounding environment must be kept under control to prevent bacterial contamination and infection of patients via the bloodstream. Regular disinfection of the area around the artificial heart, artificial lungs, and tubing is necessary. Conventional dustproof devices using a curtain structure made of pleated, flexible material are insufficient for easy cleaning and must withstand the corrosion caused by frequent chemical disinfection. Using a rotating steel belt as a dustproof device can lead to deformation noise or sharp noises from friction with surrounding obstructions. Additionally, the steel belt is prone to loosening during assembly, causing sliding noises from the rollers or sidewalls, and potentially increasing friction and shortening its lifespan. Summary of the Invention

[0007] To address the issues of dust prevention, cleaning, disinfection, and noise in medical lifting devices, this invention provides a dustproof medical lifting device, which includes:

[0008] A lifting assembly, which is retractable;

[0009] A fixed cylinder having a mounting cavity and an opening along the length of the fixed cylinder, the opening communicating with the mounting cavity, and the lifting assembly being installed in the mounting cavity;

[0010] The mounting bracket extends partially from the opening into the mounting cavity and is fixedly connected to the lifting assembly. The mounting bracket moves as the lifting assembly rises and falls.

[0011] A dustproof assembly includes a dustproof belt, an upper roller assembly, and a lower roller assembly. The upper roller assembly and the lower roller assembly are disposed within the mounting cavity. The dustproof belt surrounds the upper roller assembly and the lower roller assembly and covers the opening. The mounting frame is fixedly connected to the dustproof belt. As the mounting frame moves up and down, the dustproof belt moves around the upper roller assembly and the lower roller assembly.

[0012] The tensioning mechanism is capable of moving at least one of the rollers to adjust the tension of the dustproof belt.

[0013] As a further improvement of the embodiments of this invention, both the upper roller group and the lower roller group include at least three rollers so that the bending angle of the dustproof belt is an obtuse angle.

[0014] As a further improvement of the embodiments of this invention, the roller is provided with a groove, and the inner side of the dustproof belt is provided with raised patterns corresponding to the groove.

[0015] As a further improvement of the embodiments of this invention, the locking assembly includes a locking screw, and the mounting bracket or the dustproof belt is provided with screw holes.

[0016] As a further improvement of the embodiments of this invention, the locking assembly includes a pin, a first elastic member, and a pulling member. The first elastic member connects the pin and the fixing cylinder to allow the pin to be inserted into the groove. The pulling member is connected to the other end of the pin, and pulling the pulling member can move the pin out of the groove.

[0017] As a further improvement of the embodiments of this invention, a pin, a first elastic member, and a pulling member are also provided. The first elastic member connects the pin and the fixing cylinder to allow the pin to be inserted into the groove. The pulling member is connected to the other end of the pin, and pulling the pulling member can move the pin out of the groove.

[0018] As a further improvement of the embodiments of this invention, the tensioning mechanism includes an adjusting screw screwed to the fixed cylinder, and at least one of the rollers is disposed on the adjusting screw screw, and the position of the rollers is changed by rotating the adjusting screw screw.

[0019] As a further improvement of the embodiments of this invention, a second elastic element is also included, which is disposed between the fixed cylinder and the adjusting screw to prevent the adjusting screw from becoming loose.

[0020] As a further improvement of the embodiments of this invention, the fixing cylinder is provided with an upper cover and a lower cover, and opening the upper cover or the lower cover can enable the mounting cavity to communicate with the outside.

[0021] As a further improvement of the embodiments of the present invention, the dustproof strip includes a first layer and a second layer, wherein the first layer and the second layer are adhered and fixedly connected.

[0022] As a further improvement of the embodiments of this invention, the first layer is a steel strip and the second layer is composed of polyurethane material.

[0023] Compared to existing technologies, the dustproof assembly of this invention includes a dustproof belt, an upper roller assembly, and a lower roller assembly. The dustproof belt moves up and down with the mounting frame, always covering the opening, preventing dust from entering the interior of the medical lifting device. A tensioning mechanism can move one of the rollers to adjust the tension of the dustproof belt and prevent slippage. Implementing the dustproof medical lifting device of this embodiment can solve problems related to dust prevention, cleaning, disinfection, and noise in ECMO equipment. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. Some specific embodiments of this application will be described in detail below with reference to the accompanying drawings in an exemplary and non-limiting manner. The same reference numerals in the drawings designate the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0025] Figure 1 This diagram shows an overall structural schematic of a dustproof medical lifting device according to an embodiment of the present invention.

[0026] Figure 2 An exploded view of a dustproof medical lifting device according to an embodiment of the present invention is shown;

[0027] Figure 3 This diagram shows another exploded view of a dustproof medical lifting device according to an embodiment of the present invention;

[0028] Figure 4 A longitudinal cross-sectional schematic diagram of a dustproof medical lifting device according to an embodiment of the present invention is shown;

[0029] Figure 5 It shows Figure 4 A magnified view of a section at point A in the middle;

[0030] Figure 6 It shows Figure 4 A magnified view of a section at point B in the middle;

[0031] Figure 7 A cross-sectional schematic diagram of the transverse aspect of a dustproof medical lifting device according to an embodiment of the present invention is shown.

[0032] Figure 8 A schematic diagram of the usage state of a locking component according to an embodiment of the present invention is shown;

[0033] Figure 9 A schematic diagram of the structure of a roller according to an embodiment of the present invention is shown.

[0034] Fixed cylinder-20; mounting cavity-210; opening-220; mounting bracket-30; dustproof component-40; dustproof belt-410; upper roller assembly-420; lower roller assembly-430; roller-423; groove-4230; raised texture-4110; tensioning mechanism-50; adjusting screw-510; second elastic element-520; locking assembly-60; upper cover-230; lower cover-240; pin-630; first elastic element-640; pulling element-650; locking screw-660. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0036] This invention provides a dustproof medical lifting device; please refer to [the relevant documentation]. Figure 1 - Figure 7 shows that the dustproof medical lifting device includes:

[0037] A lifting assembly (not shown in the figure) is extendable;

[0038] The fixed cylinder 20 has a mounting cavity 210 and an opening 220 along the length of the fixed cylinder 20, the opening 220 communicating with the mounting cavity 210, and the lifting assembly is installed in the mounting cavity 210.

[0039] Mounting bracket 30 extends partially from opening 220 into mounting cavity 210 and is fixedly connected to lifting assembly (not shown). Mounting bracket 30 moves along with the lifting assembly (not shown).

[0040] The dustproof assembly 40 includes a dustproof belt 410, an upper roller assembly 420, and a lower roller assembly 430. The upper roller assembly 420 and the lower roller assembly 430 are disposed in the mounting cavity 210. The dustproof belt 410 is arranged around the upper roller assembly 420 and the lower roller assembly 430 and can cover the opening 220. The mounting frame 30 is fixedly connected to the dustproof belt 410. As the mounting frame 30 moves up and down, the dustproof belt 410 moves around the upper roller assembly 420 and the lower roller assembly 430.

[0041] Tensioning mechanism 50, which is capable of moving at least one roller 423 to adjust the tension of dust belt 410.

[0042] Compared to existing technologies, the dustproof assembly 40 of the present invention includes a dustproof belt 410, an upper roller assembly 420, and a lower roller assembly 430. The dustproof belt 410 moves up and down with the mounting bracket 30, always covering the opening 220, thus preventing dust from entering the interior of the medical lifting device. The tensioning mechanism 50 can move one of the rollers 423 to adjust the tension of the dustproof belt 410 and prevent it from slipping. Implementing the dustproof medical lifting device of this embodiment can solve problems related to dust prevention, cleaning, disinfection, and noise in ECMO equipment.

[0043] The lifting assembly can be driven by a lead screw, a pneumatic telescopic rod, or a combination of gears and racks, etc. The function of the lifting assembly is to drive the mounting bracket 30 to move up and down.

[0044] The fixed cylinder 20 is generally made of metal profile. The mounting cavity 210 mainly houses the lifting components, and the opening 220 mainly facilitates the connection of the mounting frame 30. The mounting frame 30 can be used to support ECMO system equipment.

[0045] In a preferred embodiment, both the upper roller assembly 420 and the lower roller assembly 430 include at least three rollers 423 such that the bending angle of the dustproof belt 410 is an obtuse angle.

[0046] The upper roller assembly 420 and the lower roller assembly 430 are usually configured as a set, and they are generally composed of multiple rollers 423 already assembled. The reason why one large roller is not used to replace multiple small rollers is that the space inside the fixed cylinder 20 is small, and it is not possible to install a large roller. The fixed cylinder 20 in medical lifting devices is required to occupy as little space as possible.

[0047] Both the upper roller assembly 420 and the lower roller assembly 430 include at least three rollers 423, which ensures that the bending angle of the dustproof belt 410 is an obtuse angle. This avoids excessive bending of the dustproof belt 410, which could lead to the risk of breakage.

[0048] In a more preferred embodiment, please refer to Figure 5 , Figure 8 and Figure 9 The roller 423 is provided with a groove 4230, and the inner side of the dustproof belt 410 is provided with a raised texture 4110 corresponding to the groove 4230.

[0049] In this embodiment, the grooves 4230 on the roller 423 and the raised patterns 4110 on the dustproof belt 410 cooperate with each other, thereby further preventing slippage between the dustproof belt 410 and the roller 423. Furthermore, it can reduce the noise generated by the dustproof belt 410 and prevent friction caused by relative movement between the dustproof belt 410 and the roller 423. Multiple rollers 423 allow the dustproof belt to bend at an obtuse angle, reducing stress concentration at the bending points, reducing noise generated during operation, and extending the service life of the dustproof belt 410.

[0050] In a more preferred embodiment, a locking component 60 is also included, which is fixedly disposed on the fixed cylinder 20 and can lock the fixed cylinder 20 and the mounting bracket 30 or the dustproof belt 410.

[0051] In this embodiment, the locking component 60 can take many forms. For example, it can be similar to a bicycle brake system, using a moving and pressing motion to increase the friction between the fixed cylinder 20 or the mounting bracket 30 to achieve a braking effect. Any structure that can lock the fixed cylinder 20 and the mounting bracket 30 or the dustproof strip 410 falls within the protection scope of this invention.

[0052] In a preferred embodiment, the locking assembly 60 includes a locking screw 660, and the mounting bracket 30 or dustproof strip 410 is provided with screw holes (not shown).

[0053] In this embodiment, the locking screw 660 passes through a screw hole (not shown) on the mounting bracket 30 or dustproof strip 410, thereby achieving the locking effect between the fixing cylinder 20 and the mounting bracket 30 or dustproof strip 410. In fact, the locking screw 660 and the screw hole are not necessarily screwed together; they can also be connected by a pin.

[0054] Specifically, it can be described as similar to a belt used for wearing trousers, with some screw holes spaced apart on the dustproof belt 410 for locking the screw 660 to connect with the screw hole pin.

[0055] In a more preferred embodiment, please refer to Figure 8 and Figure 9 It also includes a pin 630, a first elastic element 640, and a puller 650. The first elastic element 640 connects the pin 630 and the fixing cylinder 20 so that the pin 630 is inserted into the groove 4230. The puller 650 is connected to the other end of the pin 630. Pulling the puller 650 can move the pin 630 out of the groove 4230.

[0056] ECMO systems are crucial medical devices for maintaining patients' cardiopulmonary function, thus requiring extremely high safety standards for their lifting mechanisms. During ECMO system operation, it is essential that the system be reliably and stably secured, preventing accidental lifting or movement. Otherwise, strain on the tubing could lead to disconnection of tubing connectors and serious injury. In this embodiment, the pin 630 is always inserted into the groove 4230 under the elastic force of the first elastic element 640, thereby preventing the roller 423 from rotating and ultimately braking the mounting bracket 30. When the height of the mounting bracket 30 needs adjustment, the pulling element 650 is pulled. The pulling element 650 causes the pin 630 to overcome the elastic force of the first elastic element 640 and move out of the groove 4230, thereby releasing the braking state of the mounting bracket 30.

[0057] In this embodiment, one end of the pull member 650 is generally linked to the switch of the lifting assembly. When the switch is pressed, the pull member 650 is automatically pulled, thereby achieving one-step adjustment of the position of the mounting bracket 30.

[0058] Specifically, a pressing element (not shown) can be provided at a certain point on the pulling member 650. After the pulling member 650 is pulled, the pressing element contacts the start button of the lifting assembly (not shown), at which point the pin 630 separates from the groove 4230. When the pulling member 650 is released, under the action of the first elastic member 640, the pin 630 returns to the groove 4230, separating the pressing element from the button, thereby releasing the movement of the lifting assembly.

[0059] In a preferred embodiment, the tensioning mechanism 50 includes an adjusting screw 510 screwed to the fixed cylinder 20, and at least one roller 423 is disposed on the adjusting screw 510, and the adjusting screw 510 is rotated to change the position of the roller 423.

[0060] The tensioning mechanism 50 mainly adjusts the pressure between the roller assembly (including the upper roller assembly 420 and the lower roller assembly 430) and the dustproof belt 410 to prevent slippage. It also prevents the dustproof belt 410 from becoming loose and scraping against the surrounding side walls, which could cause noise and excessive friction.

[0061] At this time, the adjusting screw 510 and the roller 423 set on the adjusting screw 510 are equivalent to a lead screw mechanism. Rotating the adjusting screw 510 can change the pressure between the roller 423 and the dustproof belt 410, thereby adjusting the tightness of the connection between the roller 423 and the dustproof belt 410 during factory setting.

[0062] In a more preferred embodiment, a second elastic element 520 is also included, which is disposed between the fixed cylinder 20 and the adjusting screw 510 to prevent the adjusting screw 510 from becoming loose.

[0063] In this embodiment, the second elastic element 520 is disposed between the fixed cylinder 20 and the adjusting screw 510 to prevent the adjusting screw 510 from becoming loose. This is because the lifting assembly moves the dustproof assembly 40 during the lifting process, which may cause the adjusting screw 510 to become loose.

[0064] In a preferred embodiment, the fixing cylinder 20 is provided with an upper cover 230 and a lower cover 240, and opening the upper cover 230 or the lower cover 240 can enable the mounting cavity 210 to communicate with the outside.

[0065] In this embodiment, the general process of manufacturing the fixed cylinder 20 is to use an aluminum extrusion die to heat and extrude the aluminum ingot into a profile with the designed cross-sectional shape.

[0066] Then, the mounting bracket 30, lifting assembly, and dustproof assembly 40 are assembled together and inserted into the mounting cavity 210 inside the fixed cylinder 20. Next, the tensioning mechanism 50 is installed and fixed in the mounting cavity 210. Finally, the upper cover 230 and the lower cover 240 are placed on the upper and lower ends of the lifting assembly to achieve a sealing effect.

[0067] It should be noted that the adjusting screw 510 is screwed together with the lower cover 240, and the adjusting part of the adjusting screw 510 is located on the outside of the lower cover 240.

[0068] In a preferred embodiment, the dustproof strip 410 includes a first layer and a second layer, which are bonded and fixedly connected.

[0069] In this embodiment, a two-layer dustproof strip 410 is used, which can increase the strength of the dustproof strip 410 while reducing noise and avoiding affecting the doctor's operation at the surgical site.

[0070] In a preferred embodiment, the first layer is a steel strip and the second layer is composed of polyurethane material.

[0071] Normally, the dustproof tape 410 can be made of a very thin steel tape, which can also achieve the effect of the present invention.

[0072] The steel strip and polyurethane can be bonded together using chemical agents, or the steel strip and polyurethane can be integrally molded using a mold extrusion process, or the polyurethane material can be treated into a liquid state and sprayed onto the steel strip multiple times to form and fix it.

[0073] Polyurethane (PU), short for polyurethane foam, is a polymer compound. It was first developed in 1937 by Otto Bayer and others. Polyurethanes are broadly classified into polyester and polyether types. They can be used to make polyurethane plastics (mainly foamed plastics), polyurethane fibers (known as spandex in China), polyurethane rubber, and elastomers. Flexible polyurethane primarily has a thermoplastic linear structure, offering better stability, chemical resistance, resilience, and mechanical properties than PVC foam, with less compression deformation. It provides good thermal insulation, sound insulation, shock absorption, and toxicity protection. Therefore, it is used for packaging, sound insulation, and filtration materials. Rigid polyurethane plastics are lightweight, have excellent sound and thermal insulation properties, are chemically resistant, have good electrical properties, are easy to process, and have low water absorption.

[0074] The steel belt increases strength, and the polyurethane provides sound insulation, allowing it to withstand disinfection and cleaning of the medical lifting device before and after surgery. The steel side of the dustproof belt 410 faces the outside of the mounting cavity 210, while the polyurethane side faces the inside. This allows the outer steel belt to withstand disinfectant wiping well, while the elastic polyurethane side contacts the rollers, increasing friction to prevent slippage and providing excellent noise reduction.

[0075] Finally, please refer to the following: Figure 9 The groove 4230 on roller 423 can be of one type or two types. The groove 4230 can simultaneously engage the dustproof strip and, in conjunction with the pin 630, brake roller 4230. See also [reference needed]. Figure 9 The roller 423 is designed with two grooves 4230 for respectively engaging the dustproof belt and cooperating with the pin 630 to brake the roller 4230. Figure 9 In the roller 423, there are two sets of grooves 4230. One set near the two edges is used to engage with the raised texture 4110 to prevent the dustproof strip 410 from slipping on the roller 423 and causing abnormal noise. The middle set is used to engage with the pin 630 to achieve braking. The two sets of grooves 4230 can also be designed with grooves 4230 of the same shape to achieve the same effect.

[0076] The roller 423 has sidewalls at both ends, which generally prevent the dustproof belt 410 from moving off the roller 423.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A dustproof medical lifting device, characterized in that, include: A lifting assembly, wherein the lifting assembly is retractable; A fixed cylinder having a mounting cavity and an opening along the length of the fixed cylinder, the opening communicating with the mounting cavity, and the lifting assembly being installed in the mounting cavity; The mounting bracket extends partially from the opening into the mounting cavity and is fixedly connected to the lifting assembly. The mounting bracket moves as the lifting assembly rises and falls. A dustproof assembly includes a dustproof belt, an upper roller assembly, and a lower roller assembly. The upper and lower roller assemblies are disposed within the mounting cavity. The dustproof belt surrounds the upper and lower roller assemblies and covers the opening. A mounting frame is fixedly connected to the dustproof belt. As the mounting frame moves up and down, the dustproof belt moves around the upper and lower roller assemblies. Both the upper and lower roller assemblies include at least three rollers, such that the bending angle of the dustproof belt is an obtuse angle. The rollers are provided with grooves, and the inner side of the dustproof belt is provided with raised patterns corresponding to the grooves. The tensioning mechanism is capable of moving at least one of the rollers to adjust the tension of the dustproof belt. The tensioning mechanism includes an adjusting screw screwed to the fixed cylinder, and at least one of the rollers is mounted on the adjusting screw. Rotating the adjusting screw changes the position of the roller. The dustproof strip includes a first layer and a second layer, which are bonded and fixedly connected; the first layer is a steel strip and the second layer is made of polyurethane material.

2. The dustproof medical lifting device as described in claim 1, characterized in that, It also includes a locking assembly, which is fixedly mounted on the fixed cylinder and is capable of locking the fixed cylinder and the mounting bracket or the dustproof belt.

3. The dustproof medical lifting device as described in claim 2, characterized in that, The locking assembly includes a locking screw, and the mounting bracket or the dustproof belt is provided with screw holes.

4. The dustproof medical lifting device as described in claim 2, characterized in that, The locking assembly includes a pin, a first elastic element, and a pull element. The first elastic element connects the pin and the fixing cylinder to allow the pin to be inserted into the groove. The pull element is connected to the other end of the pin, and pulling the pull element can move the pin out of the groove.

5. The dustproof medical lifting device as described in claim 1, characterized in that, It also includes a second elastic element, which is disposed between the fixed cylinder and the adjusting screw to prevent the adjusting screw from becoming loose.

6. The dustproof medical lifting device as described in claim 1, characterized in that, The fixing cylinder is provided with an upper cover and a lower cover. Opening the upper cover or the lower cover can connect the mounting cavity to the outside.

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