A handheld exfoliated cell extraction device

Abstract

This utility model discloses a handheld exfoliated cell extraction device, relating to the field of trace biological information extraction. It includes a housing with a first chamber and a second chamber inside. A negative pressure generating component is installed in the first chamber and connected to the second chamber via a pipe. A detachable filter capsule is installed in the second chamber, opening with the direction of negative pressure. The second chamber is connected to the outside, and a suction head is threadedly connected to the connection point. The rear end of the suction head pierces into the filter capsule. This utility model innovatively uses a filter capsule instead of the filter membrane in traditional exfoliated cell extraction devices, preventing exfoliated cells from escaping. This utility model is convenient to use and effectively prevents exfoliated cells from escaping, making it highly practical and worthy of widespread application.

Description

Technical Field

[0001] This utility model relates to the field of microbial information extraction, and in particular to a handheld exfoliated cell extraction device. Background Technology

[0002] With the continuous development of technology, criminals' counter-investigation awareness and capabilities are gradually increasing, leaving fewer and fewer fingerprints and footprints at crime scenes, making effective trace evidence collection increasingly difficult. DNA testing technology is an indispensable tool for police in solving cases. One advantage of using DNA testing technology is that wherever a criminal has been at the scene, their shed cells will inevitably be left on the places they touched, facilitating evidence collection. Another advantage is that the accuracy rate of DNA testing technology has reached 99.999%; as long as the DNA profile curve is detected, criminals can be identified and located, reducing the occurrence of wrongful convictions. Therefore, the use of DNA testing technology is the current trend in criminal investigation technology. Extracting shed cells from criminals is a major step in DNA testing technology.

[0003] Commonly used methods for collecting exfoliated cells from the surface of physical evidence include wiping, adhesion, cutting, negative pressure adsorption, and shaking rinse. Negative pressure adsorption uses an adsorption device to scan the evidence. It has a wide range of applications, such as collecting exfoliated cells from clothing, bed sheets, plastic items, and metal objects. However, the collected exfoliated cells adhere to the filter membrane via electrostatic adsorption, so some cells may detach, affecting the test results. Utility Model Content

[0004] The present invention aims to provide a handheld exfoliated cell extraction device to solve the problem that the collected exfoliated cells rely on electrostatic adsorption on the filter membrane and may detach.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A handheld exfoliated cell extraction device includes a housing. The housing contains a first cavity and a second cavity. A negative pressure generating component is installed in the first cavity. The negative pressure generating component is connected to the second cavity via a pipe. A removable filter capsule is installed in the second cavity. The filter capsule opens unidirectionally with the direction of negative pressure. The second cavity is connected to the outside. A suction head is threadedly connected to the connection point of the second cavity to the outside. The rear end of the suction head pierces into the filter capsule.

[0007] Furthermore, the negative pressure generating component includes a power supply, a motor, and a vacuum pump. The power supply and the motor are electrically connected, the motor and the vacuum pump are power-connected, and the vacuum pump is connected to the second chamber through a pipe.

[0008] Furthermore, the filter capsule includes a cavity with one open end and a cap. The cap covers the opening of the cavity. One-way flaps are provided on both the end of the cavity away from the cap and the cap. The opening direction of the one-way flaps is consistent with the negative pressure direction. A filter membrane is provided inside the filter capsule. A protruding tube is provided at the rear end of the suction head. The protruding tube pierces the one-way flap on the cap.

[0009] Furthermore, the bladder cavity and the bladder cap are fitted together by a threaded connection or an interference fit.

[0010] Furthermore, the filter membranes are arranged in 2-3 pieces inside the filter capsule, and the filter membranes are connected by support rods. The filter capsule is provided with a protruding ring for holding the filter membranes in place.

[0011] Furthermore, the surface of the housing is provided with a switch to turn the negative pressure generating component on or off.

[0012] Furthermore, the unidirectional flap is made of elastic medical rubber material.

[0013] The principle and beneficial effects of this technical solution:

[0014] This invention innovatively uses a filter capsule instead of the filter membrane in traditional exfoliated cell extraction devices. The capsule's cap and rear end of the capsule cavity are equipped with one-way flaps. When not in use, the flaps are normally closed, protecting the internal filter membrane from contamination. When in use, the filter capsule is installed into the second cavity, followed by the suction head. The protrusion at the rear end of the suction head pierces the one-way flap on the capsule cap. At this point, the negative pressure generating component can be opened to extract exfoliated cells from the target surface. Because the opening direction of the one-way flap is consistent with the direction of negative pressure, the flap automatically opens when negative pressure is generated, sucking up the exfoliated cells. The filter membrane inside the capsule intercepts the exfoliated cells. After suction is completed, the one-way flap at the rear end of the capsule cavity automatically closes. Simultaneously, the suction head is carefully removed, and the protrusion is separated from the one-way flap on the capsule cap. The one-way flap on the capsule cap also closes, sealing the filter capsule and preventing the exfoliated cells inside from escaping. This invention is convenient to use and effectively prevents the escape of exfoliated cells, making it highly practical. Attached Figure Description

[0015] Figure 1 A schematic diagram of a handheld exfoliated cell extraction device;

[0016] Figure 2 An exploded cross-sectional view of a handheld exfoliated cell extraction device;

[0017] Figure 3 This is a partial cross-sectional view of a handheld exfoliated cell extraction device.

[0018] The reference numerals in the accompanying drawings include:

[0019] 1. Housing; 101. First cavity; 102. Second cavity; 2. Negative pressure generating assembly; 201. Power supply; 202. Motor; 203. Vacuum pump; 204. Pipeline; 3. Filter capsule; 301. Capsule cavity; 302. Capsule cover; 303. One-way membrane flap; 304. Filter membrane; 305. Support rod; 306. Protruding ring; 4. Suction head; 401. Protruding tube; 5. Switch. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0021] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0022] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, element, or component, but does not exclude the presence or addition of one or more other features, elements, or components.

[0023] In the following description, embodiments of the present invention will be illustrated with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts.

[0024] refer to Figures 1 to 3 A handheld exfoliated cell extraction device includes a housing 1, which can be made of plastic or metal, serving to protect internal components and facilitate handheld operation. The housing 1 contains a first cavity 101 and a second cavity 102. A negative pressure generating component 2 is installed in the first cavity 101 and connected to the second cavity 102 via a pipe 204. A removable filter capsule 3 is installed in the second cavity 102. The second cavity 102 is connected to the outside environment, and a suction head 4 is threadedly connected to the connection point. The suction head 4 is the part that contacts the sample and is typically circular or elliptical. It is worth noting that the suction head 4 can also be connected in other conventional ways without affecting the implementation of the device. The rear end of the suction head 4 penetrates into the filter capsule 3.

[0025] The negative pressure generating component 2 includes a power supply 201, a motor 202, and a vacuum pump 203. The power supply 201 and the motor 202 are electrically connected. The power supply 201 can be a built-in battery or connected to an external power supply 201 via a power supply line. If battery powered, a charging interface and a power indicator light can also be provided. The motor 202 and the vacuum pump 203 are power-connected. The output shaft of the motor 202 is connected to the input shaft of the vacuum pump 203, providing power to the vacuum pump 203. Powered by the power supply 201, the vacuum pump 203 is driven to operate. The vacuum pump 203 is connected to the second chamber 102 via a pipe 204. The vacuum pump 203 is the core component of the adsorption device. Driven by the motor 202, it generates negative pressure, thereby creating a vacuum at the suction head to aspirate detached cells from the sample. A switch 5 is provided on the surface of the housing 1 to open or close the negative pressure generating component 2, used to control the start and stop of the motor 202 and adjust the suction force. Typically, a control circuit board is provided for control.

[0026] The filter capsule 3 includes a cavity 301 with one end open and a cap 302. The cap 302 covers the opening of the cavity 301. Both the end of the cavity 301 away from the cap 302 and the cap 302 are provided with one-way flaps 303. The one-way flaps 303 are made of elastic medical rubber. The opening direction of the one-way flaps 303 is consistent with the negative pressure direction, so that the filter capsule 3 can open with the negative pressure direction. The filter capsule 3 is provided with a filter membrane 304 inside. The rear end of the suction head 4 is provided with a protruding tube 401, which punctures the one-way flap 303 on the cap 302.

[0027] The cavity 301 and the cap 302 are fitted together by a threaded connection or an interference fit. It is worth noting that the connection between the cavity 301 and the cap 302 can also be other conventional fitting connections, which does not affect the implementation of this device.

[0028] Two to three filter membranes 304 are arranged inside the filter capsule 3. Multiple filter membranes 304 can increase the success rate of cell interception. The filter membranes 304 are connected by support rods 305. A protruding ring 306 is provided inside the filter capsule 3 to hold the filter membranes 304 in place. The protruding ring 306 fixes the filter membranes 304 in the cavity 301 of the filter capsule 3 to prevent negative pressure from changing the position of the filter membranes 304.

[0029] This invention innovatively uses a filter capsule 3 instead of the filter membrane 304 in traditional exfoliated cell extraction devices. The filter capsule 3 has a one-way flap 303 at both its cap 302 and the rear end of its cavity 301. When not in use, the flap is normally closed, protecting the internal filter membrane 304 from contamination. When in use, the filter capsule 3 is installed into the second cavity 102, and then the suction head 4 is installed. The protrusion 401 at the rear end of the suction head 4 pierces the one-way flap 303 on the cap 302. At this time, the negative pressure generating component 2 can be opened to extract exfoliated cells from the target surface. Since the opening direction of the one-way flap 303 is consistent with the negative pressure direction, the flap automatically opens when negative pressure is generated, allowing for suction. Exfoliated cells are intercepted by the filter membrane 304 inside the filter capsule 3. After the aspiration process is completed, the one-way flap 303 at the rear end of the capsule cavity 301 automatically closes. At the same time, carefully remove the aspiration head 4 and separate the convex tube 401 from the one-way flap 303 on the capsule cover 302. The one-way flap 303 on the capsule cover 302 also closes, sealing the filter capsule 3 and preventing the exfoliated cells inside from being contaminated or escaping during the testing process. After the filter capsule 3 is sent for testing, the capsule cover 302 can be opened to remove the filter membrane 304 and test the exfoliated cells intercepted on the filter membrane 304. At the same time, the method of replacing the aspiration head 4 can prevent interference between samples collected from different batches.

[0030] This invention is easy to use and can prevent detached cells from escaping. It is highly practical and worth promoting.

[0031] In this invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or in place of features of other embodiments.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. For those skilled in the art, various modifications and variations can be made to the embodiments of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A handheld exfoliated cell extraction device, characterized by: The device includes a housing (1), inside which are a first cavity (101) and a second cavity (102). A negative pressure generating component (2) is installed in the first cavity (101). The negative pressure generating component (2) is connected to the second cavity (102) through a pipe (204). A detachable filter capsule (3) is installed in the second cavity (102). The filter capsule (3) opens unidirectionally with the direction of negative pressure. The second cavity (102) is connected to the outside. A suction head (4) is threadedly connected to the connection point of the second cavity (102) to the outside. The rear end of the suction head (4) is inserted into the filter capsule (3).

2. A handheld exfoliated cell extraction device according to claim 1, wherein: The negative pressure generating component (2) includes a power supply (201), a motor (202) and a vacuum pump (203). The power supply (201) and the motor (202) are electrically connected, and the motor (202) and the vacuum pump (203) are power connected. The vacuum pump (203) is connected to the second chamber (102) through a pipe (204).

3. The handheld exfoliated cell extraction device of claim 1, wherein: The filter capsule (3) includes a cavity (301) and a cap (302) with one end open. The cap (302) covers the opening of the cavity (301). One-way flaps (303) are provided on both the end of the cavity (301) away from the cap (302) and the cap (302). The opening direction of the one-way flaps (303) is consistent with the negative pressure direction. A filter membrane (304) is provided inside the filter capsule (3). A protrusion tube (401) is provided at the rear end of the suction head (4). The protrusion tube (401) pierces into the one-way flap (303) on the cap (302).

4. A handheld exfoliative cytology device according to claim 3, wherein: The cavity (301) and the cap (302) are connected by a threaded connection or an interference fit.

5. The handheld exfoliating cell extraction device of claim 3, wherein: The filter membrane (304) is arranged in 2-3 pieces inside the filter capsule (3). The filter membranes (304) are connected by a support rod (305). The filter capsule (3) is provided with a protruding ring (306) for holding the filter membrane (304).

6. The handheld exfoliating cell extraction device of any one of claims 1-5, wherein: The housing (1) surface is provided with a switch (5) for opening or closing the negative pressure generating component (2).

7. The handheld exfoliating cell extraction device of claim 3, wherein: The one-way flap (303) is made of elastic medical rubber.

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