EP4568788A1 - Embout pour pipette de prelevement - Google Patents
Embout pour pipette de prelevementInfo
- Publication number
- EP4568788A1 EP4568788A1 EP23787159.5A EP23787159A EP4568788A1 EP 4568788 A1 EP4568788 A1 EP 4568788A1 EP 23787159 A EP23787159 A EP 23787159A EP 4568788 A1 EP4568788 A1 EP 4568788A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- walls
- tip
- wall portion
- interior surface
- pipette
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/0275—Interchangeable or disposable dispensing tips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0848—Specific forms of parts of containers
- B01L2300/0858—Side walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/16—Surface properties and coatings
- B01L2300/161—Control and use of surface tension forces, e.g. hydrophobic, hydrophilic
- B01L2300/165—Specific details about hydrophobic, oleophobic surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/16—Surface properties and coatings
- B01L2300/161—Control and use of surface tension forces, e.g. hydrophobic, hydrophilic
- B01L2300/165—Specific details about hydrophobic, oleophobic surfaces
- B01L2300/166—Suprahydrophobic; Ultraphobic; Lotus-effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/08—Regulating or influencing the flow resistance
- B01L2400/084—Passive control of flow resistance
- B01L2400/086—Passive control of flow resistance using baffles or other fixed flow obstructions
Definitions
- the invention lies in the field of sampling pipettes, also called laboratory pipettes or liquid transfer pipettes, for taking and distributing a sample of a liquid into containers or the like.
- the invention relates to a pipette tip, suitable for manually operated pipettes, motorized pipettes, or automatic pipetting machines.
- a surface can have hydrophobic, superhydrophobic, oleophobic or superoleophobic characteristics under static measurement conditions, but can be hydrophilic, superhydrophilic, oleophilic or superoleophilic under conditions of use, in the state immersed in liquid present in the pipette tip.
- the invention aims to remedy at least partly the disadvantages mentioned above relating to the techniques of the prior art.
- the invention relates to a tip for a pipette, comprising at least one wall of conical shape of revolution of axis R.
- the wall portion comprises, on at least part of an interior surface, at least a first wall extending projecting from a base in contact with said interior surface to a vertex at an angle between 40° and 140° relative to said wall.
- the invention proposes a new and inventive approach making it possible to resolve at least in part some of the disadvantages of the prior art by the fact that the tip has, on at least part of an interior surface of a portion of conical wall, a microtextured surface with protuberances making it possible to trap pockets of air near the deformations, and thus the liquid circulating in the nozzle is at least partially in contact with the air and not entirely with the walls of the tip.
- the interactions between the liquid and the walls of the tip are limited and, consequently, the risks of liquid retention on the interior surface of the wall of the tip are limited.
- the at least one first wall extends over the entire perimeter of the interior surface of the wall portion.
- the at least one first wall can have a circular shape, that is to say form a circle around a periphery of the interior surface of the wall portion.
- the end piece may comprise, on at least part of an interior surface of said wall, several walls forming a plurality of circles spaced longitudinally, over the length of the tip.
- the tip may comprise a wall forming a spiral on the interior surface of the tip, along a longitudinal axis of the tip.
- said at least one first wall has a height h between said base and said top, less than 80pm, preferably between lpm and 50pm, still preferably between 5pm and 8 p.m.
- said at least one first wall has a first width at the location of said base of between 1 pm and 20 pm, and a second width at the location of said summit between 0.1 pm and 10 pm.
- this makes it possible to implement a triangular-shaped wall making it easier to unmold when making the end piece.
- This also makes it possible to implement different triangular shapes depending on the uses.
- the end piece has a plurality of first walls, the vertex S of each of the first walls being spaced from the vertex S of an adjacent wall by a distance less than 200pm, preferably between 10pm and 80pm.
- the end piece comprises at least one channel, each channel being delimited by the spacing between two first walls.
- the end piece comprises, on at least part of an interior surface of said wall portion, a plurality of second walls extending projecting from a base in contact with said interior surface up to a vertex along generators of the tip, said second walls intersecting said first walls, thus forming a plurality of cavities, each cavity being delimited by the intersection between two adjacent first walls and two adjacent second walls .
- said first walls are distributed around the perimeter of said interior surface of said wall portion and said second walls are distributed around the perimeter of said interior surface of said wall portion, each cavities comprising a volume between lOOpm 3 and 3,200*10 3 pm 3 .
- said first walls are uniformly distributed around the periphery of said interior surface of said wall portion and said second walls are uniformly distributed around the periphery of said interior surface of said wall portion , each of the cavities having a uniform volume between lOOpm 3 and 3,200*10 3 pm 3 .
- the invention also relates to a spindle for an injection mold configured for the plastic injection molding of a pipette tip according to one of the aforementioned embodiments, said spindle comprising a wall portion of conical shape of revolution of axis R comprising, on at least a first conical section of an exterior surface, at least a first groove dug from said exterior surface to a bottom at an angle between 40 and 140° relative to said exterior surface, on the periphery of the exterior surface.
- said spindle comprises at least a second groove dug from said exterior surface to a bottom along the generating lines of the spindle.
- the invention also relates to a method of manufacturing a spindle for an injection mold according to one of the aforementioned embodiments, the method comprising a step of forming at least one groove by micro electro-erosion, by laser, by micro-milling, by ion beam, or by 3D printing.
- the invention also relates to a method of manufacturing a pipette tip according to one of the aforementioned embodiments, by plastic injection using a plastic injection mold carrying at least one conical pin according to one of the aforementioned embodiments.
- Figure 1 is a perspective view of a pipette according to one embodiment of the invention.
- Figure 2 is a perspective view of a pipette tip according to one embodiment of the invention.
- Figure 3 is a side sectional view of the end piece of Figure 2;
- Figure 4a is another side sectional view of the end piece of Figure 2;
- Figure 4b is a detailed view of part of the tip of Figure 4a;
- Figure 4c is a detailed view of part of the tip of Figure 4b;
- Figure 5 is a detailed view of part of the tip of Figure 4c;
- Figure 6 is a detailed view of a part of a tip according to a second embodiment
- Figure 7 is a detailed view of a cavity according to the embodiment of Figure 6;
- Figure 8a is a view of a pin according to a first embodiment of the invention.
- Figure 8b is a detailed view of part of the pin of Figure 8a;
- Figure 9a is a view of a pin according to a second embodiment of the invention.
- Figure 9b is a detailed view of part of the pin of Figure 9a.
- the general principle of the invention is based on the implementation of non-point protuberances on a periphery of at least part of an interior surface of the wall of a pipette tip so as to maintain a so-called Cassie-Baxter state. , and therefore so that the drops of liquid remain at the top of the protuberances during dynamic movement of the liquid.
- Manual pipettes are intended to be held in the hand by an operator, during liquid sampling and dispensing operations.
- these operations are carried out by setting in motion a pipetting control button, obtained by applying actuation pressure to this same button which is mechanically transferred to a control rod.
- the operator's control pressure on the control button generates a signal which is transmitted to the pipette control unit, so that it triggers the movement of the control rod by using a motor embedded in the pipette.
- the pipetting machines they are placed on the laboratory bench and a control system generates the signal which is transmitted to the control unit of the machine, so that it triggers the movement of the unit. pipetting using a motor.
- pipettes whether manual, motorized, or automatic, can be air displacement pipettes or positive displacement pipettes.
- Positive displacement pipettes are used with syringe-style tips where the liquid is in direct contact with the plunger. In this case, the piston is part of the tip and is thrown away after use.
- Figure 1 illustrates a mechanical manual air displacement pipette 100 having a body 101 surmounted by a pipetting control button 103.
- the body 101 is extended by a pipetting head 102 carrying, at its end, a tip 1.
- the end piece illustrated more particularly in Figures 2 to 6, comprises a portion of wall 2 of conical shape of revolution of axis R.
- this wall portion has a section decreasing towards an outlet end 3 of the liquid from the pipette.
- the entire wall of the tip could be conical in shape.
- the wall portion 2 of the nozzle 1 has an exterior surface, and an interior surface intended to be in contact with the liquid taken or to be distributed.
- the end piece 1 comprises at least a first wall 20 developing around a periphery of at least part of the interior surface of the wall portion 2.
- This first wall 20 extends projecting from a base 200 in contact with the interior surface to a vertex 201 at an angle of between 40° and 140° relative to the wall portion 2.
- the first wall 20 extends projecting from a base 200 in contact with the interior surface of the wall portion 2 to a vertex 201 at an angle substantially equal to 90° relative to wall 2.
- such a tip 1 for a pipette makes it possible to trap pockets of air near the first wall 20, and thus the liquid circulating in the tip is at least partially in contact with the air and not entirely with the surface. interior of the tip.
- the interactions between the liquid and the walls of the tip are limited and, consequently, the risks of liquid retention on the interior surface of the wall portion 2 of the tip 1 are limited.
- the interior surface of the wall portion 2 comprises several first walls 20, two of which are shown in Figure 5.
- each of the first walls 20 has a height h, between the base 200 and the top 201, between 5pm and 20pm.
- each of the first walls has a height, between the base and the top, of less than 80 pm, preferably between lpm and 50 pm.
- each of the first walls 20 has a first width b of between 1 pm and 20 pm, and a second width c at the location of the vertex 201 of between 0.01 pm and 10 pm.
- each of the first walls 20 has a third width at half height a, corresponding to a height at 0.5h, between 0.1b and 0.6b.
- the first walls have a substantially triangular profile.
- the advantage of having such a shape for the first walls is that during manufacturing, for example by plastic injection molding, demoulding operations are facilitated.
- the first walls could be provided with a rectangular or trapezoidal shape.
- Each of these first walls 20 extends over the entire perimeter of the interior surface of the wall portion 2, and has a circular shape.
- the interior surface has a plurality of first walls spaced longitudinally and forming circles of different diameters on the interior surface of the wall portion 2.
- the longitudinal spacing f between two first walls can be considered as the spacing between two vertices 201 of two first adjacent walls, and can preferably be between lOpm and 80pm.
- the end piece comprises at least one channel, each channel being delimited by the spacing between two first walls 20.
- the top 201 of each of the first walls 20 is spaced from the top 201 of an adjacent wall by a distance less than 200 pm.
- such a longitudinal spacing f allows the liquid, during dynamic displacement, to come into contact with the first walls and soak a height d of the first walls, avoiding coming into contact with the interior surface of the wall portion 2.
- This longitudinal spacing therefore makes it possible to have a height m between the top 201 of the wall and the bottom of the meniscus which is less than 0.99h.
- the liquid meniscus forming between two walls has a height m less than the height h so as not to touch the interior surface of the wall portion 2.
- the tip could comprise a single first wall forming a spiral on the interior surface of the tip, along a longitudinal axis of the tip.
- the end piece could comprise several portions of first walls aligned on the same altitude of the periphery of the interior surface of the end piece.
- the tip l' for pipette comprising a wall portion 2' of conical shape of revolution of axis R, with, as for the first embodiment, several first walls 20' developing on a periphery of a part of an interior surface of the wall 2', the first wall extending projecting from a base in contact with the interior surface to a vertex at an angle between 40° and 140° relative to the wall 2'.
- the end piece further comprises, on at least part of an interior surface of the wall portion 2', a plurality of second walls 21' extending projecting from a base 210' in contact with the interior surface up to a peak 211' along the generators of the tip, these second walls intersecting the first walls 20'.
- the end piece comprises a plurality of cavities 23', each cavity being delimited by the intersection between two adjacent first walls 20' and two adjacent second walls 21'.
- first walls 20' are not distributed uniformly around the perimeter of the interior surface of the wall portion 2' and the second walls 21' are distributed uniformly around the perimeter of the interior surface of the wall 2'.
- a 24' central strip remains free of any wall.
- each of the cavities 23' comprises a substantially equal volume of between 1OOpm 3 and 3,200*10 3 pm 3 .
- first walls 20' could be distributed uniformly around the perimeter of the interior surface of the wall portion 2' and/or the second walls could be distributed uniformly around the perimeter of the interior surface of the wall portion 2'. wall 2'.
- this pin comprises a wall portion of conical shape of revolution of axis R comprising, on at least a first section 90 of an exterior surface at least a first groove 91 dug from the exterior surface to a bottom according to an angle between 40 and 140° relative to the exterior surface, around the perimeter of the exterior surface. More particularly, in this embodiment, this pin comprises a plurality of first grooves 91 dug from the exterior surface to a bottom at an angle of between 40 and 140° relative to the exterior surface.
- this pin 9' comprises a wall portion of conical shape of revolution of axis R comprising, on at least a first section 90' of an exterior surface at least a first groove 91' dug from the exterior surface up to at a bottom at an angle between 40 and 140° relative to the exterior surface, around the perimeter of the exterior surface.
- this pin comprises a plurality of first grooves 91' dug from the exterior surface to a bottom at an angle of between 40 and 140° relative to the exterior surface.
- the spindle of this second embodiment comprises on at least a first conical section of an exterior surface at least one second groove 92' dug from the exterior surface to a bottom at an angle of between 40 and 140° relative to the exterior surface, along the generators of the spindle.
- the spindle comprises a plurality of second grooves 92' dug from said exterior surface to a bottom along generators of the spindle.
- Such a pin according to one of the embodiments described above makes it possible to implement a method of manufacturing a pipette tip by plastic injection using a plastic injection mold comprising at least one pin.
- this spindle for an injection mold can be manufactured by means of a process comprising a step of forming at least one groove by micro electro-erosion, by laser, by micro-milling, by ion beam, or by 3D printing.
Landscapes
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Devices For Use In Laboratory Experiments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2210760A FR3140779A1 (fr) | 2022-10-18 | 2022-10-18 | Embout pour pipette de prelevement |
| PCT/FR2023/051460 WO2024084146A1 (fr) | 2022-10-18 | 2023-09-22 | Embout pour pipette de prelevement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4568788A1 true EP4568788A1 (fr) | 2025-06-18 |
Family
ID=84488870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23787159.5A Pending EP4568788A1 (fr) | 2022-10-18 | 2023-09-22 | Embout pour pipette de prelevement |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4568788A1 (fr) |
| FR (1) | FR3140779A1 (fr) |
| WO (1) | WO2024084146A1 (fr) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011517773A (ja) * | 2008-03-28 | 2011-06-16 | バイオティクス, インコーポレイテッド | サンプル調製デバイスおよび分析物の処理方法 |
| KR101981556B1 (ko) * | 2017-07-18 | 2019-05-23 | 포항공과대학교 산학협력단 | 피펫 팁 및 이를 제조하는 방법 |
-
2022
- 2022-10-18 FR FR2210760A patent/FR3140779A1/fr active Pending
-
2023
- 2023-09-22 EP EP23787159.5A patent/EP4568788A1/fr active Pending
- 2023-09-22 WO PCT/FR2023/051460 patent/WO2024084146A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024084146A1 (fr) | 2024-04-25 |
| FR3140779A1 (fr) | 2024-04-19 |
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Legal Events
| Date | Code | Title | Description |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
Effective date: 20250314 |
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| AK | Designated contracting states |
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Free format text: CASE NUMBER: APP_30590/2025 Effective date: 20250626 |
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