A pipetting device for medical testing

Abstract

The utility model discloses a medical detection is with pipette equipment, pipette main part, damping structure is fixedly connected on the surface of the shell of pipette main part, connecting structure, one end is connected with the movable part of damping structure, and the other end is movably connected with the button of pipette main part, damping structure provides first damping force when the button is pressed, provides second damping force greater than first damping force when the button rebounds, to make button steady rebound. The utility model discloses through setting up damping structure, and through connecting structure, it is linked with button, makes damping force small when button is pressed, and rebound damping force is big, so that button can slowly, steady rebound, avoid the liquid surface out of control problem caused by the rapid rebound of spring because of the operation hand feeling hard, reduces the operation threshold and long -time use's hand fatigue, improves user experience and work efficiency.

Description

Technical Field

[0001] This application relates to the field of pipetting equipment technology, and more particularly to a pipetting device for medical testing. Background Technology

[0002] Medical testing is a series of scientific methods that analyze human samples to obtain information related to disease diagnosis, health status assessment, and disease monitoring. To ensure accurate and reliable test results, pipetting equipment must be used to precisely process microliters or even nanoliters of samples and reagents, eliminating human error.

[0003] Existing pipetting devices generally include an air displacement system, a volume adjustment mechanism, a pipette tip connection, and a retraction mechanism. During operation, after pressing the button to the first stop point and immersing the pipette tip in the liquid, the button must be slowly and steadily released by hand, relying on the rebound force of the piston spring to draw in the liquid. This rebound process entirely depends on the user's technique to control the speed, and the operational effect depends entirely on the user's experience and feel, making it difficult to guarantee consistency. Therefore, a pipetting device for medical testing is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a pipetting device for medical testing to solve the problems mentioned in the background art.

[0005] The embodiments of this application adopt the following technical solutions: A pipetting device for medical testing includes: a pipette body; a damping structure fixedly connected to the surface of the outer shell of the pipette body; and a connecting structure, one end of which is connected to a movable part of the damping structure, and the other end of which is movably connected to a button on the pipette body; the damping structure provides a first damping force when the button is pressed and a second damping force greater than the first damping force when the button rebounds, so as to make the button rebound smoothly.

[0006] Preferably, the damping structure includes: a cylinder, fixedly connected to the surface of the outer shell; a piston, which slides and seals with the inner wall of the cylinder, and divides the interior of the cylinder into an upper chamber and a lower chamber; a push handle, fixedly connected to the top of the piston, with its end away from the piston connected to a button via a connecting structure; and a damping channel, formed inside the piston, which connects the upper chamber and the lower chamber.

[0007] Preferably, the damping channel includes a main throttling orifice that penetrates the body of the piston, and its orifice diameter is configured to generate the second damping force.

[0008] Preferably, the damping flow channel further includes an auxiliary flow channel, which is arranged in parallel with the main throttling orifice, and a one-way valve is fixedly connected inside the auxiliary flow channel, which allows fluid to flow unidirectionally from the lower chamber to the upper chamber.

[0009] Preferably, the top of the cylinder is sealed by an end cap, the push handle slides through the end cap, and a rod sealing ring is provided between the push handle and the end cap.

[0010] Preferably, the cylinder is filled with hydraulic oil or silicone oil as a damping medium.

[0011] Preferably, at least one piston sealing ring is provided between the piston and the inner wall of the cylinder.

[0012] Preferably, the connecting structure is a connecting ring, the surface of which is fixedly connected to one end of the push handle, and the inner wall of which is rotatably connected to the surface of the button.

[0013] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects: In this invention, by setting a damping structure and linking it with the button through a connecting structure, the damping force is small when the button is pressed down and large when it rebounds, so that the button can rebound slowly and smoothly. This avoids the problem of liquid level loss caused by the rapid rebound of the spring due to a stiff operating feel, reduces the operating threshold and hand fatigue during long-term use, and improves user experience and work efficiency. Attached Figure Description

[0014] 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. In the drawings: Figure 1 Here is a three-dimensional structural schematic diagram of this utility model; Figure 2 Here is a cross-sectional view of the cylindrical body of this utility model; Figure 3 Here is a three-dimensional structural diagram of the piston of this utility model; Figure 4 See: A cross-sectional view of the piston of this utility model.

[0015] In the diagram: 1. Pipette body; 11. Outer shell; 12. Button; 2. Damping structure; 21. Cylinder; 211. Upper chamber; 212. Lower chamber; 22. Piston; 23. Push handle; 24. Damping flow channel; 241. Main throttling orifice; 242. Auxiliary flow channel; 25. Check valve; 26. End cap; 3. Connection structure. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0018] Please see Figure 1-4 This utility model provides a technical solution for a pipetting device for medical testing: A pipetting device for medical testing includes: a pipette body 1 (existing technology, not described in detail here); a damping structure 2, fixedly connected to the surface of the outer shell 11 of the pipette body 1, for providing damping force for the rebound of the button 12 to ensure its slow and smooth rebound; and a connecting structure 3, one end of which is connected to the movable part of the damping structure 2, and the other end of which is movably connected to the button 12 of the pipette body 1; the damping structure 2 provides a first damping force when the button 12 is pressed, and provides a second damping force greater than the first damping force when the button 12 rebounds, so that the button 12 rebounds smoothly.

[0019] Specifically, by setting up a damping structure 2 and linking it with the button 12 through a connecting structure 3, the damping force is small when the button 12 is pressed down and large when it rebounds, so that the button 12 can rebound slowly and smoothly. This avoids the problem of liquid surface loss caused by the rapid rebound of the spring due to a stiff operating feel, reduces the operating threshold and hand fatigue during long-term use, and improves user experience and work efficiency.

[0020] The damping structure 2 includes: a cylinder 21, fixedly connected to the surface of the outer shell 11; a piston 22, which slides and seals against the inner wall of the cylinder 21, dividing the interior of the cylinder 21 into an upper chamber 211 and a lower chamber 212; a push handle 23, fixedly connected to the top of the piston 22, with its end away from the piston 22 connected to the button 12 via a connecting structure 3; and a damping flow channel 24, which is opened inside the piston 22, connecting the upper chamber 211 and the lower chamber 212. The piston 22 divides the interior of the cylinder 21 into the upper chamber 211 and the lower chamber 212. When the piston 22 moves downward, the volume of the lower chamber 212 decreases and the pressure increases, while the volume of the upper chamber 211 increases and the pressure decreases, forcing the damping fluid to flow from the lower chamber 212 to the upper chamber 211. By setting the damping flow channel 24, a damping force is generated during fluid flow, thereby slowing down the piston 22.

[0021] The damping channel 24 includes a main throttling orifice 241 that penetrates the body of the piston 22 and is configured to generate a second damping force, which is responsible for generating the large damping force required when the button 12 rebounds. Preferably, the orifice diameter of the main throttling orifice 241 is 0.2 mm to 0.4 mm.

[0022] The damping flow channel 24 also includes an auxiliary flow channel 242, which is connected in parallel with the main throttling orifice 241. A one-way valve 25 is fixedly connected inside the auxiliary flow channel 242. The one-way valve 25 allows fluid to flow unidirectionally from the lower chamber 212 to the upper chamber 211, enabling the fluid to flow from the lower chamber 212 to the upper chamber 211 at a faster speed, thus reducing the resistance when the button 12 is pressed down. Specifically, when the user presses the button 12, the button 12 drives the push handle 23 downwards via the connecting structure 3. The push handle 23 drives the piston 22 downwards, increasing the pressure in the lower chamber 212. The one-way valve 25 is opened under pressure, opening the auxiliary flow channel 242 and allowing most of the damping fluid to pass through the lower chamber 212. The auxiliary flow channel 242 of the resistance flows rapidly into the upper chamber 211. At this time, although the main throttling orifice 241 also participates in the flow, the overall flow resistance is very small, so the first damping force is small and the user can press down easily. When the button 12 rebounds, it drives the piston 22 to move upward, the pressure in the upper chamber 211 increases, the one-way valve 25 is tightly closed under the reverse pressure, the auxiliary flow channel 242 is cut off, and all fluid is forced to squeeze through the tiny main throttling orifice 241, generating huge viscous resistance. This resistance is the large second damping force, which makes the button 12 only rebound slowly and uniformly. The one-way valve 25 is preferably a diaphragm one-way valve 25. Of course, in other embodiments, it can also be a spring ball valve.

[0023] The top of the cylinder 21 is sealed by the end cap 26 to prevent fluid from leaking from the top when the push handle 23 slides up and down, and to block external contaminants from entering. The push handle 23 slides through the end cap 26, and a rod sealing ring is provided between the push handle 23 and the end cap 26 to ensure a tight seal between the piston 22 and the cylinder 21.

[0024] The cylinder 21 is filled with hydraulic oil or silicone oil as a damping medium to ensure that the inside of the damping structure 2 is a closed hydraulic system filled with working medium.

[0025] At least one piston seal ring is provided between the piston 22 and the inner wall of the cylinder 21 to prevent pressure crosstalk between the upper chamber 211 and the lower chamber 212, and to maintain normal pressure difference and damping force.

[0026] The connecting structure 3 is a connecting ring. The surface of the connecting ring is fixedly connected to one end of the push handle 23. The inner wall of the connecting ring is rotatably connected to the surface of the button 12. When the pipette body 1 is in use, the button 12 needs to be rotated to adjust the volume. The connecting ring is rotatably connected to the mounting, which can avoid interference with the rotation of the button 12 when the two are linked.

[0027] Working Principle: When using this medical testing pipetting device, the user first sets the volume and installs the pipette tip. Then, holding the pipette vertically and gripping the main body 1, the user presses button 12 to the first stop point, just like operating a regular pipette. During this process, button 12 drives the push handle 23 downward through the connecting structure 3. The push handle 23 drives the piston 22 downward, increasing the pressure in the lower chamber 212. The one-way valve 25 is opened under pressure, opening the auxiliary flow channel 242. Most of the damped fluid flows rapidly into the upper chamber 211 through the low-resistance auxiliary flow channel 242. At this time, although the main throttling orifice 241 also participates in the flow, the overall flow resistance is very small, so the first damping force is small, the user's downward pressure is easy, and the damping structure 2 generates almost no additional resistance. Then, the pipette... When the tip of the pipette is submerged below the liquid surface, releasing button 12 eliminates the need for deliberate speed control as with traditional pipettes. Button 12 automatically and uniformly rebounds under the control of the damper, and the liquid is smoothly drawn into the pipette tip. During this process, button 12 moves piston 22 upward, increasing the pressure in the upper chamber 211. The one-way valve 25 is tightly closed under the reverse pressure, cutting off the auxiliary flow channel 242. All fluid is forced through the tiny main throttling orifice 241, generating significant viscous resistance. This resistance is the substantial second damping force, causing button 12 to rebound only slowly and uniformly. Subsequent operation can proceed in the same manner as with ordinary pipettes. This reduces the operational threshold and hand fatigue during prolonged use of this medical testing pipetting device, improving user experience and work efficiency.

[0028] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A pipetting device for medical testing, characterized in that, include: Pipette body (1); Damping structure (2) is fixedly connected to the surface of the outer shell (11) of the pipette body (1); The connecting structure (3) is connected at one end to the movable part of the damping structure (2) and at the other end to the button (12) of the pipette body (1). The damping structure (2) provides a first damping force when the button (12) is pressed and a second damping force greater than the first damping force when the button (12) rebounds, so that the button (12) rebounds smoothly.

2. The pipetting device for medical testing according to claim 1, characterized in that: The damping structure (2) includes: The cylindrical body (21) is fixedly connected to the surface of the outer shell (11); The piston (22) slides and seals with the inner wall of the cylinder (21), and divides the interior of the cylinder (21) into an upper chamber (211) and a lower chamber (212). The push handle (23) is fixedly connected to the top of the piston (22), and its end away from the piston (22) is connected to the button (12) through the connecting structure (3); A damping channel (24) is provided inside the piston (22), and the damping channel (24) connects the upper chamber (211) and the lower chamber (212).

3. A pipetting device for medical testing according to claim 2, characterized in that: The damping channel (24) includes a main throttling orifice (241) that penetrates the body of the piston (22) and whose orifice diameter is configured to generate the second damping force.

4. A pipetting device for medical testing according to claim 3, characterized in that: The damping flow channel (24) also includes an auxiliary flow channel (242), which is arranged in parallel with the main throttling orifice (241), and a one-way valve (25) is fixedly connected inside the auxiliary flow channel (242), which allows fluid to flow unidirectionally from the lower chamber (212) to the upper chamber (211).

5. A pipetting device for medical testing according to claim 2, characterized in that: The top of the cylinder (21) is sealed by the end cap (26), the push handle (23) slides through the end cap (26), and a rod sealing ring is provided between the push handle (23) and the end cap (26).

6. A pipetting device for medical testing according to claim 2, characterized in that: The cylinder (21) is filled with hydraulic oil or silicone oil as a damping medium.

7. A pipetting device for medical testing according to claim 2, characterized in that: At least one piston sealing ring is provided between the piston (22) and the inner wall of the cylinder (21).

8. A pipetting device for medical testing according to claim 2, characterized in that: The connecting structure (3) is a connecting ring body. The surface of the connecting ring body is fixedly connected to one end of the push handle (23), and the inner wall of the connecting ring body is rotatably connected to the surface of the button (12).

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