A smear device

Abstract

This utility model discloses a test smear applicator, belonging to the field of clinical medical technology. It includes a base, a slide stage, and a smear assembly. The slide stage is horizontally positioned and slidably engaged with the base. A fixing unit for securing glass slides is provided on the slide stage. The smear assembly includes a rotatable cylinder, a smear unit, a ratchet locking unit, and a ratchet advancing unit. The smear unit includes a rotating sleeve and multiple smear pads detachably connected to the outside of the sleeve. The cylinder is inserted into the rotating sleeve. The ratchet locking unit is located at one end of the cylinder to prevent forward rotation. The locking smear pads can smear samples on the forward-feeding slide stage. The ratchet advancing unit is located at the other end of the cylinder, allowing the reverse-feeding slide stage to be pushed by the ratchet advancing unit to rotate the cylinder in the opposite direction by a certain angle for smear pad replacement. This utility model enables automatic smear preparation and improves smear efficiency.

Description

Technical Field

[0001] This utility model relates to the field of clinical medical technology, and in particular to a test smear applicator. Background Technology

[0002] Clinical laboratory testing involves examining specimens such as blood, body fluids, secretions, excretions, and shed tissues from patients using visual observation, physical, chemical, instrumental, or molecular biological methods. It emphasizes strict quality management measures throughout the entire testing process (pre-analysis, analysis, and post-analysis) to ensure the quality of testing, thereby providing valuable experimental data for clinicians and patients.

[0003] When preparing test specimens, it is usually necessary to smear the samples. The existing smear method mainly involves staff applying the smear with cotton swabs, which is not only cumbersome and cannot guarantee the uniformity of the smear, but also greatly reduces the efficiency of smearing when multiple samples are needed for batch testing. Utility Model Content

[0004] In view of this, it is necessary to provide an inspection smear applicator to solve the problems of uneven smears and low efficiency in existing smears.

[0005] This utility model provides a test smear applicator, comprising:

[0006] Base;

[0007] A slide stage is set horizontally and is slidably engaged with the base. The slide stage is provided with a fixing unit for fixing the glass slide.

[0008] A smear assembly includes a rotatable drum, a smear unit, a ratchet locking unit, and a ratchet advancing unit. The smear unit includes a rotating sleeve and multiple smears detachably connected to the outside of the rotating sleeve. The drum is inserted into the rotating sleeve. The ratchet locking unit is located at one end of the drum to prevent the drum from rotating forward. The smears are locked relative to the drum and can be used to apply samples to the forward-feeding slide stage. The ratchet advancing unit is located at the other end of the drum, and the reverse-feeding slide stage can be pushed by the ratchet advancing unit to rotate the drum in the opposite direction by a certain angle for replacing the smears.

[0009] Furthermore, the ratchet propulsion unit includes a rack, a gear, a slider, a rotatable first pawl, and a first ratchet fixedly connected to the plate stage. The first ratchet is fixedly connected to one end of the rotating cylinder, one end of the first pawl engages with the first ratchet, and the other end of the first pawl is rotatably connected to the slider. The slider is slidably engaged with the gear, and the gear can drive the slider to reciprocate along the base. The rack meshes with the gear, and the forward and reverse movement of the plate stage can drive the gear to rotate in both directions.

[0010] Furthermore, the gear is provided with a drive shaft positioned relatively to the outside, and the slider has a vertically positioned drive groove in the middle. The drive shaft is inserted into the drive groove, and the gear can drive the slider to reciprocate linearly.

[0011] Furthermore, a torsion spring is provided between the first pawl and the slider, and the torsion spring can drive the first pawl to engage the first ratchet.

[0012] Furthermore, the ratchet locking unit includes a rotatable second pawl and a second ratchet. The second ratchet is fixedly connected to the other end of the rotating drum. One end of the second pawl engages with the second ratchet, and the other end of the first pawl is rotatably connected to the frame. A torsion spring is provided between the second pawl and the frame, and the torsion spring can drive the second pawl to engage with the second ratchet.

[0013] Furthermore, the plurality of smear pads are equidistantly arranged around the rotating sleeve, and the arc between two adjacent smear pads is consistent with the arc of the first ratchet wheel rotating once driven by the first pawl.

[0014] Furthermore, the outer side of the rotating sleeve is provided with multiple slots, and the smearing pad is slidably engaged in the slots.

[0015] Furthermore, the fixing unit includes a snap-fit ​​component protruding from the slide stage, and the multiple snap-fit ​​components enclose a space for snapping the glass slide.

[0016] Furthermore, it also includes a titration assembly, which includes a titration holder that spans the base and has a burette at the top, with the opening of the burette positioned relative to the glass slide.

[0017] Furthermore, a handle for driving the slide stage to move is provided on one side of the slide stage.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This utility model discloses a sample preparation device, comprising a sample preparation assembly. The assembly includes a rotatable drum, a sample preparation unit, a ratchet locking unit, and a ratchet advancing unit. The sample preparation unit includes a rotating sleeve and multiple smears detachably connected to the outside of the sleeve. The smears can be replaced as needed to prevent excessive wear. The drum is inserted into the rotating sleeve and drives the sleeve to rotate synchronously, switching the smears and maintaining the scraping effect. The ratchet locking unit restricts the forward rotation of the drum, ensuring that a specific smear is applied to the sample on a forward-moving glass slide, improving application efficiency. The ratchet advancing unit converts the reverse linear motion of the slide stage into the intermittent rotational motion of the drum, with each rotation angle corresponding to the spacing between adjacent smears, achieving automatic smear switching. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the ratchet propulsion unit in this utility model;

[0024] Figure 4 This is a schematic diagram of the connection structure between the transfer cylinder and the coating unit of this utility model;

[0025] Figure 5 This is a schematic diagram of the connection structure between the transfer cylinder and the coating unit of this utility model;

[0026] Figure 6 This is a schematic diagram of the coating unit in this utility model;

[0027] Figure 7 This is a schematic diagram of the connection structure between the base and the slide stage in this utility model.

[0028] In the diagram, 100 represents the base.

[0029] 200. Stage; 210. Fixing unit; 211. Snap-fit ​​connector; 220. Handle;

[0030] 300, Patch assembly; 310, Rotary drum; 320, Patch unit; 321, Rotating sleeve; 321a, Slot; 322, Patch; 330, Ratchet locking unit; 331, Second pawl; 332, Second ratchet; 340, Ratchet drive unit; 341, Rack; 342, Gear; 342a, Drive shaft; 343, Slider; 343a, Drive groove; 344, First pawl; 345, First ratchet;

[0031] 400. Titration assembly; 410. Titration stand. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0033] This embodiment of a medical slide applicator relates to the field of medical testing technology. It solves the problems of slide positioning and automatic feeding, avoiding time-consuming manual adjustments. By setting a structure with replaceable applicator components, the smear slide 322 can be replaced, optimizing the applicator effect. Simultaneously, combining the mechanical principle of converting linear motion into rotational motion, a linkage mechanism is conceived that drives the rotating cylinder 310 to rotate via the reciprocating movement of the slide stage 200, achieving automatic switching of the smear slide 322.

[0034] Please see Figures 1 to 7 As shown, an inspection smear device in this embodiment includes a base 100, a slide stage 200, and a smear assembly 300. The base 100 is a rigid platform that supports the moving parts and can provide effective support for the slide stage 200 and the smear assembly 300.

[0035] The slide stage 200 is horizontally positioned and slidably connected to the base 100. The slide stage 200 is provided with a fixing unit 210 for fixing the glass slide. The fixing unit 210 can fix the glass slide to prevent the glass slide from shifting during the coating process, which would affect the coating quality.

[0036] The smear assembly 300 includes a rotatable drum 310, a smear unit 320, a ratchet locking unit 330, and a ratchet advancing unit 340. The smear unit 320 includes a rotating sleeve 321 and multiple smears 322 detachably connected to the outside of the rotating sleeve 321. The smears 322 can be replaced as needed to prevent excessive wear. The drum 310 is inserted into the rotating sleeve 321 and can drive the rotating sleeve 321 to rotate synchronously, thereby switching the smears 322 and maintaining the smearing effect. The ratchet locking unit 330 can restrict the forward rotation of the drum 310, allowing a specific smear 322 to smear the sample on the forward-moving glass slide, improving smearing efficiency. The ratchet advancing unit 340 can convert the reverse linear motion of the slide stage 200 into the intermittent rotational motion of the drum 310, with each rotation angle corresponding to the spacing of adjacent smears 322, realizing automatic switching of the smears 322.

[0037] During use, when the operator pushes the slide stage 200 forward, the glass slide fixed on it moves accordingly. At this time, the ratchet locking unit 330 prevents the rotating cylinder 310 from rotating, and the specific smearing pad 322 mounted on the rotating sleeve 321 contacts the sample surface at a fixed angle, uniformly smearing the sample during the movement. When the slide stage 200 reverses and resets, the ratchet pushing unit 340 converts the linear motion into the rotational power of the rotating cylinder 310, driving the rotating sleeve 321 to rotate by a predetermined angle so that the next smearing pad 322 reaches the working position.

[0038] It should be noted that: the base 100 is a frame with a hollow center, and the slide stage 200 is embedded in the center of the base 100. The slide stage 200 and the base 100 are connected by a sliding groove, and the slide stage 200 is slidably engaged in the base 100. The base 100 can restrict the movement direction of the slide stage 200, allowing the slide stage 200 to move along the length of the base 100.

[0039] In some embodiments, please refer to Figure 1 and Figure 3As shown, the ratchet propulsion unit 340 includes a rack 341, a gear 342, a slider 343, a rotatable first pawl 344, and a first ratchet 345, all fixedly connected to the slide stage 200. The first ratchet 345 is fixedly connected to one end of the rotating cylinder 310. One end of the first pawl 344 engages with the first ratchet 345, and the other end of the first pawl 344 is rotatably connected to the slider 343. The slider 343 is slidably engaged with the gear 342, which drives the slider 343 to reciprocate along the base 100. The rack 341 meshes with the gear 342. The forward and reverse movement of the slide stage 200 drives the gear 342 to rotate in both directions. The forward and reverse rotation of the gear 342 drives the first pawl 344 to move in either direction. The forward movement of the first pawl 344 skips teeth relative to the first ratchet 345, thereby maintaining the relative locking of the rotating cylinder 310 and facilitating the application of the spreading plate 322 onto the glass slide. The first pawl 344 moves in the opposite direction, pushing the first ratchet 345 to rotate by the corresponding arc, thereby switching the smearing pad 322.

[0040] In practical implementation, rack 341 is a bar-shaped transmission component rigidly connected to the stage 200. It can be implemented using a metal strip with a toothed structure, and its teeth mesh with gear 342 to transmit motion. Gear 342 is a rotary transmission component meshing with rack 341, and can be implemented using a spur gear structure. It drives the rack 341 to rotate forward and backward via linear motion. Slider 343 is a linear motion component slidably connected to gear 342. It can be implemented using a metal block with guide grooves, and its motion is converted from the rotation of gear 342 into linear reciprocating motion.

[0041] Specifically, when the slide stage 200 moves forward, the rack 341 drives the gear 342 to rotate clockwise. The gear 342 pushes the slider 343 to one side via the drive shaft 342a. At this time, the first pawl 344 slides on the ratchet tooth surface and cannot push the rotating cylinder 310. When the slide stage 200 moves in the reverse direction, the rack 341 drives the gear 342 to rotate counterclockwise. The gear 342 drives the slider 343 to move to the other side. The first pawl 344, under the action of the torsion spring, engages with the ratchet teeth of the first ratchet 345, pushing the rotating cylinder 310 to rotate in the opposite direction at a fixed angle, so that the next smear 322 is aligned with the glass slide.

[0042] Compared with existing technologies, traditional smearing devices require manual replacement of smearing tools. However, this solution uses the meshing transmission of rack 341 and gear 342 to transform the reciprocating movement of the slide stage 200 into the intermittent rotation of the ratchet mechanism, thereby achieving automatic switching of the smearing tablets 322 and avoiding efficiency loss caused by manual intervention.

[0043] In some embodiments, please refer to Figure 3As shown, the gear 342 is provided with a drive shaft 342a positioned relatively externally, and the slider 343 is provided with a vertically positioned drive groove 343a in the middle. The drive shaft 342a is inserted into the drive groove 343a. The gear 342 can drive the slider 343 to move back and forth in a linear motion. The rotational motion of the drive shaft 342a with the gear 342 can be converted into vertical and horizontal motion. The drive groove 343a can counteract the vertical motion of the drive shaft 342a, thereby transmitting the horizontal motion to the slider 343, achieving the purpose of driving the slider 343 to move horizontally back and forth.

[0044] In practical implementation, the drive shaft 342a is a cylindrical component fixed to the outside of the gear 342. It can be a metal shaft or a high-strength plastic shaft. The drive shaft 342a is integrally connected to the gear 342 or connected by bolts, converting the rotational motion of the gear 342 into the linear displacement of the slider 343. The drive groove 343a is a vertical guide structure located in the middle of the slider 343. It can be a rectangular groove or a U-shaped groove, formed by machining or stamping, and is used to restrict the movement trajectory of the drive shaft 342a, ensuring that the slider 343 can only move linearly along the base 100.

[0045] Specifically, when the stage 200 moves in the reverse direction, the rack 341 drives the gear 342 to rotate in the reverse direction, and the drive shaft 342a moves along a circumferential path as the gear 342 rotates. Since the drive shaft 342a is embedded in the drive groove 343a of the slider 343, its circumferential motion is constrained by the groove wall and converted into the linear reciprocating motion of the slider 343. The linear movement of the slider 343 drives the first pawl 344 to push the first ratchet 345 to rotate in the reverse direction by a fixed angle, thereby driving the rotating drum 310 to rotate synchronously, realizing the automatic replacement of the application sheet 322. Through the cooperation of the drive shaft 342a and the drive groove 343a, the rotational motion of the gear 342 is precisely converted into the linear displacement of the slider 343, ensuring that the ratchet rotates only a predetermined angle each time.

[0046] Compared with existing technologies, the linkage between gear 342 and slider 343 in traditional coating devices often adopts a connecting rod or cam structure, which has the problems of a large number of parts and complex motion trajectories. This solution simplifies the transmission structure and reduces the number of kinematic pairs by directly cooperating the drive shaft 342a and the drive groove 343a. At the same time, it avoids positioning deviations caused by friction and improves the stability and repeatability of ratchet rotation.

[0047] As a further embodiment, a torsion spring is provided between the first pawl 344 and the slider 343. The torsion spring can drive the first pawl 344 to engage the first ratchet 345. The torsion spring can drive the first pawl 344 to jump teeth relative to the first ratchet 345 and then reset, ensuring that the first pawl 344 always maintains engagement with the first ratchet 345 and preventing the first ratchet 345 from rotating relative to it.

[0048] In practical implementation, a torsion spring is a mechanical component that generates elastic force through its own torsion. It can be made of spiral metal wire, with its two ends fixed to the connecting shaft of the pawl and slider 343, respectively. The torsion spring accumulates elastic potential energy when the pawl disengages from the ratchet, and releases this potential energy to push the pawl back to its original position when engagement is required. Engagement refers to the state where the end of the pawl forms mechanical contact with the ratchet tooth groove. This can be achieved by designing the end of the pawl as a wedge-shaped structure, which, under the action of the spring, embeds into the ratchet tooth groove to form a one-way lock.

[0049] Specifically, when the stage 200 moves in the reverse direction, the gear 342 drives the slider 343 to slide along the base 100 via the drive shaft 342a. At this time, the torsion spring is in a compressed state, and its elastic force forces the first pawl 344 to rotate around the axis, so that the end of the pawl is always in close contact with the tooth surface of the first ratchet 345. When the slider 343 moves to the limit position, the pawl engages with the adjacent tooth groove of the ratchet under the action of the spring, pushing the rotating cylinder 310 to complete the rotation of the predetermined angle.

[0050] When the stage 200 moves forward, the slider 343 slides in the reverse direction, causing the pawl to disengage from the ratchet. At this time, the torsion spring is recompressed to store elastic potential energy for the next engagement action.

[0051] Compared to existing technologies, this solution utilizes a torsion spring that acts directly on the rotation axis, achieving stable torque output within a limited space and avoiding energy loss caused by sliding friction. Furthermore, the spring preload can be adjusted according to different loads, for example, by changing the spring wire diameter or the number of coils to match different ratchet mechanisms.

[0052] In some embodiments, please refer to Figure 2 The locking unit includes a rotatable second pawl 331 and a second ratchet 332. The second ratchet 332 is fixedly connected to the other end of the rotating drum 310. One end of the second pawl 331 is engaged with the second ratchet 332. The other end of the first pawl 344 is rotatably connected to the frame. The first pawl 344 can lock the second ratchet 332 in one direction, preventing the second ratchet 332 from rotating in the forward direction.

[0053] A torsion spring is provided between the second pawl 331 and the frame. The torsion spring can drive the second pawl 331 to engage with the second ratchet 332. The torsion spring can also drive the second pawl 331 to jump back and reset relative to the second ratchet 332, ensuring that the second pawl 331 always maintains engagement with the second ratchet 332 and preventing the first ratchet 345 from rotating relative to it.

[0054] In practical implementation, the second pawl 331 is a rotatable locking component used to engage with the second ratchet 332 to restrict the forward rotation of the rotating drum 310. It can be implemented using a metal stamping process, with its end designed as a hook to fit the ratchet teeth. The second ratchet 332 is a disc component with unidirectional teeth, fixedly connected to the rotating drum 310. Specifically, it can be fixed to the end of the rotating drum 310 via keyway fitting or welding, and its teeth match the hook-shaped structure of the second pawl 331.

[0055] Among them, the torsion spring refers to the elastic element that provides rotational elastic force to maintain the meshing state between the second pawl 331 and the second ratchet 332. Specifically, it can be a helical spring or leaf spring structure, with one end fixed to the frame and the other end acting on the rotation axis of the second pawl 331.

[0056] Specifically, when the stage 200 moves forward, the second pawl 331 is engaged with the second ratchet 332 under the action of the torsion spring, preventing the rotating drum 310 from rotating forward with the gear 342, and ensuring that the smearing pad 322 remains stationary during the sample application process; when the stage 200 moves in the reverse direction, the ratchet pusher unit 340 drives the rotating drum 310 to rotate in the reverse direction. At this time, the second pawl 331 temporarily disengages under the push of the ratchet teeth, overcoming the elasticity of the torsion spring, allowing the rotating drum 310 to rotate a certain angle to switch the smearing pad 322.

[0057] In some embodiments, please refer to Figures 4 to 6 As shown, multiple smear pads 322 are equidistantly arranged around the rotating sleeve 321, and the arc between two adjacent smear pads 322 is consistent with the arc of one rotation of the first ratchet 344 driving the first ratchet 345. When the slide stage 200 moves in the reverse direction, the rack 341 drives the gear 342 to move the slider 343, and the first ratchet 344 pushes the first ratchet 345 to rotate at a fixed angle. Since the spacing between adjacent smear pads 322 corresponds to the single rotation angle of the ratchet, after each rotation of the rotating sleeve 321, the new smear pad 322 automatically aligns with the surface of the glass slide.

[0058] The smear pads 322 can be arranged in a ring array, equidistantly surrounding the rotating sleeve 321, so that each smear pad 322 can reach the working position at the same interval after rotation. The central angle between the center points of adjacent smear pads 322 is equal to the rotation angle of the ratchet pushed by the pawl each time. This can be achieved by calculating the ratio between the ratchet tooth pitch and the circumference of the rotating sleeve 321, ensuring that the rotating sleeve 321 switches to the working position of the next smear pad 322 exactly after each ratchet rotation.

[0059] In some examples, if the ratchet rotates 30 degrees at a time, and the outer circumference of the rotating sleeve 321 is provided with 12 equidistant applicator pads 322, then after each ratchet rotation, the rotating sleeve 321 switches to the next applicator pad 322. The arc between two adjacent applicator pads 322 is consistent with the arc of the first ratchet 344 driving the first ratchet 345 to rotate once, so that the applicator pads 322 can be automatically replaced without manual intervention after each applicator operation, while ensuring that the switching angle of each applicator pad 322 is perfectly matched with the motion trajectory of the mechanical drive system.

[0060] Please refer to the following: Figure 6 As shown, the rotating sleeve 321 has multiple slots 321a on its exterior. The applicator 322 is slidably engaged in the slots 321a, which facilitates the assembly and disassembly of the applicator 322. The slots 321a are groove structures set on the outer surface of the rotating sleeve 321, which can be formed by milling or stamping processes. Their function is to provide positioning and fixed support for the applicator 322, ensuring that the applicator 322 remains stable during rotation.

[0061] The slots 321a on the outside of the card sleeve 321 are evenly distributed circumferentially, and the size of each slot 321a matches the mounting end of the applicator 322. When the applicator 322 needs to be installed, it slides laterally into the slot 321a until it is fully fitted; when it needs to be replaced, the applicator 322 is pulled out in the opposite direction of sliding along the slot 321a. Through the limiting effect of the slots 321a, the applicator 322 will not be displaced or shifted during rotation, thus ensuring the stability of the scraping action.

[0062] In some embodiments, please refer to Figure 7 As shown, the fixing unit 210 includes a snap-fit ​​member 211 protruding from the slide stage 200. Multiple snap-fit ​​members 211 surround each other to form a space for snapping the glass slide, which can effectively position and fix the glass slide.

[0063] The snap-fit ​​component 211 is a component with a protruding structure that is fixed on the slide stage 200. It can be made of an elastic material such as rubber or plastic, and generates clamping force through deformation to fix the slide. The snap-fit ​​component 211 can accommodate slides of different thicknesses and prevents the slide from sliding during the movement of the slide stage 200.

[0064] Multiple snap-fit ​​pieces 211 form a limiting area that matches the edge of the slide through their positional distribution and shape matching. Specifically, four snap-fit ​​pieces 211 arranged symmetrically can form a rectangular frame. The protruding parts of the snap-fit ​​pieces 211 restrict the lateral displacement of the slide, while allowing the slide to be quickly inserted or removed in the vertical direction.

[0065] The slide is placed within a space enclosed by multiple locking elements 211. The elastic protrusions of the locking elements 211 apply a clamping force to the edge of the slide through deformation, thereby fixing the position of the slide. When the slide stage 200 moves forward or backward, the friction between the locking elements 211 and the slide can resist inertia and prevent the slide from shifting.

[0066] In some examples, the snap-fit ​​211 can be designed as an L-shaped metal sheet, with its vertical portion embedded inside the slide stage 200 and its horizontal portion extending outward to form a flange. The glass slide is placed in the area enclosed by the flange and is stably clamped by elastic deformation.

[0067] Compared to existing technologies, traditional fixing methods typically rely on grooves on the slide stage 200. The fixed size of these grooves makes them incompatible with slides of different sizes, and the lack of an active clamping structure within the grooves allows the slides to easily slide during movement. This solution uses a deformable snap-fit ​​component 211 to actively clamp the slides, providing not only greater compatibility but also effectively preventing displacement and improving the stability of the smearing operation.

[0068] In some embodiments, please refer to Figure 1 and Figure 2 As shown, a test smear applicator includes a titration assembly 400, which includes a titration frame 410. The titration frame 410 is disposed across a base 100. A burette is provided on the top of the titration frame 410. The opening of the burette is positioned relative to the glass slide, and the burette can be used to add test solution relative to the glass slide.

[0069] In the specific implementation process, the titration rack 410 refers to the support structure used to fix the burette. Specifically, it can be implemented by a gantry frame structure made of metal or polymer materials, which forms a stable support by spanning above the base 100.

[0070] Among them, a burette is a container used to store and release test reagents. It can be made of glass or plastic tubular structure, with the tube opening facing down and aligned with the glass slide to facilitate accurate reagent dripping.

[0071] The setting of the opening relative to the glass slide means that the liquid outlet of the burette is vertically aligned with the surface of the glass slide. This can be achieved by adjusting the height or angle of the burette holder 410 to ensure that the reagent covers the target area of ​​the glass slide when it drips.

[0072] Specifically, the burette holder 410, by spanning the base 100, allows the burette to cover the processing area where the glass slide is located. When the glass slide is moved under the burette via the slide stage 200, the reagent can drip vertically from the burette opening onto the surface of the glass slide. Because the burette holder 410 is fixedly connected to the base 100, its positional stability prevents displacement during the dripping process, thereby ensuring the consistency of the reagent coverage area.

[0073] In some embodiments, please refer to Figure 7 A handle 220 is provided on one side of the stage 200. The handle 220 can drive the stage 200 to move forward or backward, realizing a semi-automatic driving mode and improving the coating efficiency.

[0074] In practice, the handle 220 is a metal or high-strength plastic handle. The handle 220 is connected to the slide stage 200 by bolts, or the handle 220 is integrated with the slide stage 200.

[0075] Specifically, the operator can manually hold the handle 220 to push the slide stage 200 forward or backward as the driving force for coating. Alternatively, the slide stage 200 can be moved by adding automated drive devices such as cylinders, electric push rods, or lead screws.

[0076] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A smear testing device, characterized in that, include: Base; A slide stage is set horizontally and is slidably engaged with the base. The slide stage is provided with a fixing unit for fixing the glass slide. A coating assembly, comprising a rotatable drum, a coating unit, a ratchet locking unit, and a ratchet advancing unit, wherein the coating unit comprises a rotating sleeve and a plurality of coating pieces detachably connected to the outside of the rotating sleeve, and the drum is inserted into the rotating sleeve; The ratchet locking unit is located at one end of the rotating drum to prevent the rotating drum from rotating in the forward direction; the relative locking of the smear allows the sample on the forward-feeding slide stage to be applied; the ratchet pushing unit is located at the other end of the rotating drum, and the reverse-feeding slide stage can be pushed by the ratchet pushing unit to rotate the rotating drum in the reverse direction by a certain angle for replacing the smear.

2. The smear tester according to claim 1, characterized in that, The ratchet propulsion unit includes a rack, a gear, a slider, a rotatable first pawl, and a first ratchet, all fixedly connected to the plate stage. The first ratchet is fixedly connected to one end of the rotating drum. One end of the first pawl engages with the first ratchet, and the other end of the first pawl is rotatably connected to the slider. The slider is slidably engaged with the gear. The gear can drive the slider to reciprocate along the base. The rack meshes with the gear, and the forward and reverse movement of the plate stage can drive the gear to rotate in both directions.

3. The smear tester according to claim 2, characterized in that, The gear is provided with a drive shaft positioned relative to the outside, and the slider is provided with a vertically positioned drive groove in the middle. The drive shaft is inserted into the drive groove, and the gear can drive the slider to move back and forth in a linear motion.

4. The smear tester according to claim 3, characterized in that, A torsion spring is provided between the first pawl and the slider, and the torsion spring can drive the first pawl to engage the first ratchet.

5. A smear tester according to claim 2, characterized in that, The ratchet locking unit includes a rotatable second pawl and a second ratchet. The second ratchet is fixedly connected to the other end of the rotating drum. One end of the second pawl engages with the second ratchet, and the other end of the first pawl is rotatably connected to the frame. A torsion spring is provided between the second pawl and the frame, and the torsion spring can drive the second pawl to engage with the second ratchet.

6. A smear tester according to claim 2, characterized in that, The multiple smear pads are equidistantly arranged around the rotating sleeve, and the arc between two adjacent smear pads is consistent with the arc of the first ratchet wheel rotating once driven by the first pawl.

7. A smear tester according to claim 6, characterized in that, The outer side of the rotating sleeve is provided with multiple slots, and the smearing pad is slidably engaged in the slots.

8. The smear tester according to claim 1, characterized in that, The fixing unit includes a snap-fit ​​component protruding from the slide stage, and the multiple snap-fit ​​components enclose a space for snapping the glass slide.

9. A smear tester according to claim 1, characterized in that, It also includes a titration assembly, which includes a titration holder that is positioned across the base, and a burette at the top of the titration holder with its opening facing the glass slide.

10. A smear tester according to claim 1, characterized in that, A handle for driving the slide stage to move is provided on one side of the slide stage.

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