Micro-transfer device for high-viscosity preparation

Abstract

The utility model relates to the technical field of pipettors, in particular to a high-viscosity preparation trace transfer device which comprises a pipe body, a piston rod arranged in the pipe body and a rubber piston arranged at the end of the piston rod, the pipe body is provided with a liquid taking opening and a mounting opening, and a plurality of limiting rings at equal intervals are arranged on the inner wall of the pipe body. Protruding columns are symmetrically arranged on the two sides of the outer circumferential wall of the piston rod, receding notches allowing the protruding columns to penetrate through are symmetrically formed in the two sides of the limiting rings, and the positions of the receding notches in the adjacent limiting rings are arranged in a staggered mode. The pipettor has the advantages that the problem that the single suction volume of the pipettor is not fixed is solved, and the precision of the liquid taking volume is improved.

Description

Technical Field

[0001] The present application relates to the technical field of pipettes, and in particular to a micro-transfer device for high-viscosity preparations. Background Art

[0002] A pipette is a device used to transfer liquids quantitatively. It can transfer small or trace amounts of liquids when conducting analytical testing. When the blood transfusion department of a hospital performs blood typing and cross-matching, it usually uses a pipette to transfer blood samples so that the samples can be analyzed in different instruments.

[0003] In the related art, the pipette includes a tube body, a piston rod placed in the tube body, and a rubber piston arranged at the end of the piston rod. The tube body has a liquid extraction port with a smaller diameter and a mounting port for the piston rod to be installed, and the outside of the tube body is marked with scale lines. The piston rod extends into the tube body at the mounting port and the rubber piston is pressed against the inner wall of the tube body. The rubber piston is driven by the piston rod to slide up and down in the tube. The operator aligns the liquid extraction port of the tube body with the liquid to be transferred and pulls the piston rod, and the liquid to be transferred can be sucked into the tube body by atmospheric pressure.

[0004] Regarding the above-mentioned related technologies, since the pipette cannot control the amount of liquid aspirated at a time, the operator needs to observe the scale line marked on the tube body at any time to accurately grasp the amount of liquid taken. Since the operating angle of view is higher than the tube body, it is impossible to always keep the horizon and the scale line horizontal, which easily leads to less liquid being taken, and the accuracy of liquid taking is low. Utility Model Content

[0005] In order to improve the problem of non-fixed single aspiration volume of a pipette and enhance the accuracy of liquid extraction, the present application provides a micro-transfer device for high-viscosity preparations.

[0006] The present application provides a high viscosity preparation micro-transfer device using the following technical solution:

[0007] A high-viscosity preparation micro-transfer device comprises a tube body, a piston rod placed in the tube body and a rubber piston arranged at the end of the piston rod, the tube body has a liquid intake port and a mounting port, a plurality of equally spaced limiting rings are arranged on the inner wall of the tube body, convex columns are symmetrically arranged on both sides of the outer peripheral wall of the piston rod, and clearance notches for the convex columns to pass through are symmetrically opened on both sides of the limiting rings, and the clearance notches on adjacent limiting rings are arranged in staggered positions.

[0008] By adopting the above technical solution, the limit rings set at equal intervals are equivalent to materializing the scale lines, so as to preset the single liquid extraction volume. The piston rod is rotated axially so that the boss is aligned with the clearance notch of the limit ring so that the piston rod can be pulled inside the tube body. Since the clearance notches on adjacent limit rings are staggered, the boss on the piston rod will be blocked by the adjacent limit rings. The distance between the two limit rings is defined as one unit. When the rubber piston rises one unit, it means that one unit of liquid to be transferred is absorbed in the tube. This allows the operator to accurately control the liquid extraction volume without frequently observing the scale lines, thereby improving the accuracy of liquid extraction.

[0009] Furthermore, a slot for the boss to be inserted into is provided on the limiting ring at a position adjacent to the clearance notch, and the inner wall of the slot on the side away from the adjacent clearance notch is inclined from the bottom of the slot to the side away from the adjacent clearance notch to form a first guide surface to guide the boss to slide out.

[0010] By adopting the above technical solution, the slot is set at the position adjacent to the clearance notch, and the protrusion is locked into the slot by rotating the piston rod to prevent the protrusion from falling into the adjacent clearance notch, bringing a locking effect to the piston rod, preventing the device from shaking during transportation or operation and causing the piston rod to be triggered incorrectly. The inner wall of the slot away from the adjacent clearance notch is inclined from the bottom of the slot to the side away from the adjacent clearance notch, forming a first guide surface for guiding the protrusion to slide out, so that when the piston rod needs to be moved, the protrusion can slide out of the slot more smoothly and enter the clearance notch of the next limit ring.

[0011] Furthermore, the limiting ring is provided with a second guiding surface along the length direction on one side close to the liquid intake port for guiding the protruding column to slide into the clearance notch on the opposite side.

[0012] By adopting the above technical solution, the setting of the second guide surface enables the protrusion to move smoothly along the limit ring after sliding out of the slot, thereby entering the clearance gap on the opposite side. The smooth transition reduces the jamming and resistance during the operation and improves the overall smoothness of the operation.

[0013] Furthermore, a limiting protrusion is provided on the limiting ring, and the limiting protrusion is located at an adjacent position of a side of the clamping slot where the first guiding surface is provided.

[0014] By adopting the above technical solution, the limiting protrusion is arranged at the connecting position of the second guide surface and the first guide surface, which is equivalent to providing an additional limiting structure at the initial position of the second guide surface after the boss slides out of the slot along the first guide surface. This can prevent the device from shaking during transportation or operation and causing erroneous triggering of the piston rod, and can also generate a certain resistance or feedback during the sliding of the boss. This tactile change helps the operator to perceive the position change of the boss, thereby more accurately controlling the movement of the piston rod.

[0015] Furthermore, the piston rod includes a movable portion for a user to push and pull and a mounting portion for mounting the rubber piston, and the movable portion and the mounting portion are coaxially arranged and rotationally connected.

[0016] By adopting the above technical solution, the movable part and the mounting part are rotationally connected. When the operator rotates the movable part of the piston rod, the rubber piston on the mounting part will not rotate relative to the inner wall of the tube body, which is conducive to ensuring a close fit with the inner wall of the tube body and improving the sealing performance.

[0017] Furthermore, the rubber piston has a connecting portion for cooperating with the mounting portion and an abutting portion abutting against the inner wall of the tube body, the abutting portion is coaxially and integrally arranged with the connecting portion, and the diameter of the abutting portion is greater than the diameter of the connecting portion;

[0018] The mounting portion is provided with a protrusion for clamping the rubber piston at one end away from the movable portion, and the connecting portion is provided with a mounting groove on the side wall for the protrusion to be installed, and the mounting groove is opened from the outer side wall of the connecting portion to the central axis position of the connecting portion.

[0019] By adopting the above technical solution, the matching setting of the protrusion and the installation groove enables the protrusion to smoothly enter the installation groove of the rubber piston during the installation process of the rubber piston, forming a tight fit with the connecting part, preventing the rubber piston from falling off or shifting during use, and improving the stability of the installation.

[0020] Furthermore, a plurality of ridges are provided on the outer wall of the abutting portion at intervals along the length direction, and each of the ridges abuts tightly against the inner wall of the tube body.

[0021] By adopting the above technical solution, the ridges increase the contact area between the abutting portion and the inner wall of the tube body and form more sealing points. During the liquid transfer process, the ridges can more effectively prevent liquid from leaking from the gap between the rubber piston and the tube body, thereby improving the sealing performance of the device.

[0022] Furthermore, the tube body includes an operating tube provided with the limiting ring and a liquid collection tube for accommodating the liquid to be transferred, the operating tube is coaxially arranged with the liquid collection tube and is detachably connected, and the length of the operating tube is greater than the length of the liquid collection tube.

[0023] By adopting the above technical solution, since the liquid collection tube is used to absorb a small amount or a trace amount of liquid, the length does not need to be too long. The operation tube and the liquid collection tube are detachably connected, which is convenient for the operator to separate the two, so as to clean and disinfect the inside of the liquid collection tube, or directly use disposable materials and discard them after a single use. The length of the operation tube is greater than the length of the liquid collection tube, so that the operator can have a larger operating space when pushing and pulling the piston rod, thereby improving the comfort and stability of the operation.

[0024] Furthermore, the operating tube is provided with a sealing cap at one end away from the liquid collection tube.

[0025] By adopting the above technical solution, the cover is used to close the open end of the operating tube to prevent dust, impurities or other contaminants from entering the interior of the operating tube, which is conducive to maintaining the cleanliness and sterility of the interior of the device when handling liquids that require highly clean conditions such as high-viscosity preparations. When the device is not in use, the cover can ensure that the operating tube is in a closed state to prevent the piston rod from accidentally slipping out or liquid leakage.

[0026] Furthermore, the length of the piston rod is greater than the length of the tube body and the piston rod protrudes from the installation port, and a pressing block is provided at the end of the piston rod away from the rubber piston. A spring is sleeved on the outer wall of the movable part of the piston rod, and the spring is pressed between the pressing block and the sealing cover.

[0027] By adopting the above technical solution, the setting of the spring enables the convex column on the piston rod to automatically fill the position. When the piston rod is rotated or pushed and pulled, the spring is tensioned between the pressing block and the cover, thereby achieving the effect of pulling the convex column on the movable part to press against the limit ring. When the piston rod is in a non-operating state, due to the compression of the spring, the cover will not fall off the operating tube, thereby enhancing the sealing of the device.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The limit rings set at equal intervals cooperate with the convex column on the piston rod to achieve the preset and precise control of the single liquid extraction volume, without the need to frequently observe the scale line, improving the accuracy and efficiency of liquid extraction. The card slot can limit the convex column to prevent it from falling into the wrong gap. The setting of the first guide surface makes it easier for the convex column to slide out of the card slot, and the second guide surface allows the convex column to slide smoothly along the surface of the limit ring when the piston rod rotates, reducing the jamming and resistance during operation and improving the overall fluency and convenience of operation;

[0030] 2. The rotating connection design between the movable part and the mounting part ensures that the rubber piston will not rotate relative to the inner wall of the tube body, which is conducive to maintaining a close fit with the inner wall of the tube body. The matching of the bump and the mounting groove and the design of the convex ridges enhance the connection stability and sealing between the rubber piston and the tube body to prevent liquid leakage;

[0031] 3. The detachable connection between the operating tube and the liquid collection tube facilitates the cleaning and disinfection of the operating tube. It also supports the use of disposable materials for the operating tube, improving the flexibility of use and hygiene standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of a micro-transfer device for high-viscosity preparations according to an embodiment of the present application.

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of a micro-transfer device for a high-viscosity preparation according to an embodiment of the present application.

[0034] Figure 3 The overall structure of the limiting ring in the embodiment of the present application is shown in FIG. Figure 1 .

[0035] Figure 4 The overall structure of the limiting ring in the embodiment of the present application is shown in FIG. Figure 2 .

[0036] Figure 5 It is a schematic diagram of the cross-sectional structure of the limit ring in the embodiment of the present application.

[0037] Figure 6 yes Figure 2 Schematic diagram of the enlarged structure of part A.

[0038] Figure 7 It is a schematic diagram of the overall structure of the rubber piston in the embodiment of the present application.

[0039] Explanation of the reference numerals: 1. tube body; 11. operating tube; 111. mounting port; 112. limiting ring; 1121. clearance gap; 1122. slot; 1123. first guide surface; 1124. second guide surface; 1125. limiting protrusion; 1126. sealing cover; 12. liquid collection tube; 121. liquid collection port; 2. piston rod; 21. movable part; 211. boss; 212. pressing block; 213. spring; 22. mounting part; 221. protrusion; 3. rubber piston; 31. connecting part; 311. mounting groove; 32. abutting part; 321. convex ridge. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-7 And embodiments, the present application is further described in detail.

[0041] The present application discloses a high-viscosity preparation micro-transfer device. The words such as "upper" and "lower" used to express the positional relationship in the present application are determined with reference to the placement and installation position of the high-viscosity preparation micro-transfer device in a normal use state.

[0042] Reference Figure 1 and Figure 2 The high viscosity preparation micro-transfer device comprises a tube body 1, a piston rod 2 and a rubber piston 3. The piston rod 2 is installed inside the tube body 1, and the rubber piston 3 is installed at the end of the piston rod 2, and the outer wall of the rubber piston 3 is pressed against the inner wall of the tube body 1.

[0043] The tube body 1 includes an operating tube 11 and a liquid collection tube 12 which are coaxially arranged and detachably connected. The liquid collection tube 12 has a liquid collection port 121 for sucking a trace amount of liquid sample, and the end of the operating tube 11 away from the liquid collection tube 12 has a mounting port 111 for inserting the piston rod 2. Since the liquid collection tube 12 is considered to be contaminated after contacting blood, it needs to be disposable. The detachable connection between the liquid collection tube 12 and the operating tube 11 in this embodiment is a threaded connection, which is convenient for the operator to remove and replace the liquid collection tube 12.

[0044] Reference Figure 2 and Figure 3 The piston rod 2 is provided with a pressing block 212 at one end away from the rubber piston 3, and the pressing block 212 is threadedly connected to the piston rod 2. The operating tube 11 is provided with a cover 1126 in the installation opening 111, which is in contact with the inner wall of the operating tube 11, and the piston rod 2 is inserted at the central axis position of the cover 1126. The piston rod 2 is provided with a spring 213 on the outside, and the spring 213 is tightly pressed between the cover 1126 and the pressing block 212.

[0045] The inner wall of the operating tube 11 is evenly spaced with a plurality of stop rings 112, and each stop ring 112 is fixedly connected to the operating tube 11. Two symmetrically arranged bosses 211 are vertically fixedly connected to the side wall of the piston rod 2. The stop rings 112 are symmetrically provided with clearance notches 1121 for the bosses 211 to pass through on both sides, and the clearance notches 1121 on adjacent stop rings 112 are staggered. The operator rotates the piston rod 2 axially half a circle to align the bosses 211 with the clearance notches 1121, and pulls up the piston rod 2 to absorb the liquid. When the bosses 211 rise a certain distance and are blocked by the adjacent stop rings 112.

[0046] Reference Figure 4 and Figure 5The lower side of the limiting ring 112 is provided with a slot 1122 for the boss 211 to be placed at a position adjacent to the clearance notch 1121, and a limiting portion formed by the limiting ring 112 body is left between the slot 1122 and the clearance notch 1121. When the piston rod 2 is axially rotated, the setting of the slot 1122 can prevent the boss 211 from sliding into the clearance notch 1121 at the adjacent position. The inner wall of the slot 1122 and the side away from the adjacent clearance notch 1121 is provided with a first guide surface 1123 for guiding the boss 211 to slide out. The limiting ring 112 is provided with a limiting protrusion 1125 at a position adjacent to the slot 1122, and the limiting protrusion 1125 is close to the side of the slot 1122 where the first guide surface 1123 is provided. A second guiding surface 1124 for guiding the boss 211 to enter the opposite side clearance gap 1121 is provided on the limiting ring 112 at a position adjacent to the limiting protrusion 1125 . The second guiding surface 1124 is inclined in a spiral shape on the limiting ring 112 .

[0047] Reference Figure 6 and Figure 7 The piston rod 2 has a movable portion 21 for rotation and pushing and pulling and a mounting portion 22 connected to the rubber piston 3. The movable portion 21 and the mounting portion 22 are coaxially arranged and rotationally connected. The pressing block 212 and the boss 211 are both arranged on the movable portion 21. The mounting portion 22 is integrally connected with a convex block 221 for clamping with the rubber piston 3 at one end away from the movable portion 21.

[0048] The rubber piston 3 includes a connecting portion 31 for connecting with the mounting portion 22 of the piston rod 2 and an abutting portion 32 for abutting against the inner wall of the liquid collection tube 12. The connecting portion 31 and the abutting portion 32 are coaxially arranged and integrally connected. The diameter of the abutting portion 32 is larger than the diameter of the connecting portion 31. A plurality of ridges 321 are arranged at intervals along the thickness direction on the outer wall of the abutting portion 32. Each ridge 321 abuts against the inner wall of the liquid collection tube 12.

[0049] The connecting portion 31 is provided with a mounting groove 311 for the protrusion 221 to be installed therein. The mounting groove 311 is formed through the side wall of the connecting portion 31 to the central axis of the connecting portion 31 .

[0050] The implementation principle of a high-viscosity preparation micro-transfer device in an embodiment of the present application is as follows: by axially rotating the movable portion 21 of the piston rod 2, the boss 211 on the movable portion 21 is aligned with the clearance notch 1121 of the limit ring 112 on the inner wall of the operating tube 11. The piston rod 2 is pulled upward to make the rubber piston 3 rise in the liquid collection tube 12, thereby sucking the required amount of liquid sample. Since the clearance notches 1121 on adjacent limit rings 112 are staggered in position, the boss 211 will be blocked by the adjacent limit rings 112 during the rising process, thereby achieving the preset single liquid collection amount. Rotating the piston rod 2 allows the boss 211 to enter the groove 1122 on the limit ring 112. The groove 1122 can prevent the boss 211 from sliding into the adjacent clearance notch 1121 during transportation or operation, thereby achieving the locking of the piston rod 2. When it is necessary to continue moving the piston rod 2, rotate the piston rod 2 again, and the boss 211 slides out of the slot 1122 under the guidance of the first guide surface 1123, and moves along the second guide surface 1124 to the opposite side of the clearance gap 1121 to achieve unlocking and continue moving. The movable part 21 is rotatably connected to the mounting part 22 to ensure that the rubber piston 3 will not rotate relative to the inner wall of the tube body 1 during rotation, thereby maintaining the sealing performance. The spring 213 sleeved on the outside of the piston rod 2 provides elastic force between the sealing cover 1126 and the pressing block 212, so that the piston rod 2 can be reset when not affected by external force. The liquid collection tube 12 and the operating tube 11 are detachably connected, which is convenient for replacing the new liquid collection tube 12 after the liquid collection tube 12 is contaminated, supports disposable use, and improves the hygiene standard and flexibility of the device.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for transferring a high-viscosity preparation in micro-amounts, comprising a tube body (1), a piston rod (2) disposed in the tube body (1), and a rubber piston (3) disposed at the end of the piston rod (2), wherein the tube body (1) has a liquid extraction port (121) and an installation port (111), and is characterized in that: The inner wall of the tube body (1) is provided with a plurality of equally spaced limiting rings (112); the outer wall of the piston rod (2) is symmetrically provided with protruding columns (211) on both sides; the limiting rings (112) are symmetrically provided with clearance notches (1121) on both sides for the protruding columns (211) to pass through; and the clearance notches (1121) on adjacent limiting rings (112) are arranged in staggered positions.

2. A high viscosity preparation micro-transfer device according to claim 1, characterized in that: The limiting ring (112) is provided with a slot (1122) for the protruding column (211) to be inserted into at a position adjacent to the clearance notch (1121), and the inner wall of the slot (1122) on the side away from the adjacent clearance notch (1121) is inclined from the bottom of the slot (1122) to the side away from the adjacent clearance notch (1121) to form a first guiding surface (1123) for guiding the protruding column (211) to slide out.

3. A high viscosity preparation micro-transfer device according to claim 2, characterized in that: The limiting ring (112) is provided with a second guiding surface (1124) along the length direction on one side close to the liquid intake port (121) for guiding the protruding column (211) to slide into the clearance notch (1121) on the opposite side.

4. A high viscosity preparation micro-transfer device according to claim 3, characterized in that: The limiting ring (112) is provided with a limiting protrusion (1125), and the limiting protrusion (1125) is located at an adjacent position on a side of the clamping groove (1122) where the first guide surface (1123) is provided.

5. A high viscosity preparation micro-transfer device according to claim 1, characterized in that: The piston rod (2) comprises a movable portion (21) for a user to push and pull, and a mounting portion (22) for mounting the rubber piston (3); the movable portion (21) and the mounting portion (22) are coaxially arranged and rotationally connected.

6. A high viscosity preparation micro-transfer device according to claim 5, characterized in that: The rubber piston (3) comprises a connecting portion (31) for cooperating with the mounting portion (22) and an abutting portion (32) abutting against the inner wall of the tube body (1); the abutting portion (32) is coaxially arranged with the connecting portion (31) and the diameter of the abutting portion (32) is greater than the diameter of the connecting portion (31); The mounting portion (22) is provided with a protrusion (221) for clamping the rubber piston (3) at one end away from the movable portion (21); the connecting portion (31) is provided with a mounting groove (311) on a side wall for the protrusion (221) to be installed; the mounting groove (311) is formed from the outer side wall of the connecting portion (31) to the central axis of the connecting portion (31).

7. A high viscosity preparation micro-transfer device according to claim 6, characterized in that: A plurality of ridges (321) are provided at intervals along the length direction on the outer wall of the abutting portion (32), and each of the ridges (321) abuts tightly against the inner wall of the tube body (1).

8. A high viscosity preparation micro-transfer device according to claim 1, characterized in that: The tube body (1) comprises an operating tube (11) provided with the limiting ring (112) and a liquid collection tube (12) for containing the liquid to be transferred, the operating tube (11) and the liquid collection tube (12) being coaxially arranged and detachably connected, and the length of the operating tube (11) is greater than the length of the liquid collection tube (12).

9. A high viscosity preparation micro-transfer device according to claim 8, characterized in that: The operating tube (11) is provided with a sealing cap (1126) at one end away from the liquid extraction tube (12).

10. A high viscosity preparation micro-transfer device according to claim 9, characterized in that: The length of the piston rod (2) is greater than the length of the tube body (1) and the piston rod (2) protrudes from the installation port (111). The piston rod (2) is provided with a pressing block (212) at the end away from the rubber piston (3). The piston rod (2) is provided with a spring (213) on the outer wall of the movable part (21), and the spring (213) is pressed between the pressing block (212) and the sealing cover (1126).

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