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1. (WO2019009778) SERINGUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. A syringe (100) comprising a barrel (102) with a needle (101) arranged at a distal end (110) of the barrel (102), said barrel (102) being adapted to contain a drug, the barrel (102) having a tubular wall extending proximally from said distal end (110), whereby the barrel (102) extends along an axis (1000), the syringe (100) further comprising:

a plunger stopper (103) disposed within the barrel (102), said plunger stopper (103) being adapted to be in fluid-tight engagement with the tubular wall of the barrel (102), wherein said plunger stopper (103) having a thread profile (105b); and

a plunger rod (104) extending along the axis (1000), wherein said plunger rod (104) having a thread profile (105a) engaging with the thread profile (105b) of the plunger stopper (103);

whereby said engaged plunger stopper (103) and plunger rod (104) are being displaceable along the axis (1000) within said barrel (102), whereby said engagement of the thread profiles (105a, 105b) is configured such that the axial separation force (B) between the plunger stopper (103) and the plunger rod (104) in a proximal direction being less than a liquid suction force (A) through the needle (101).

2. The syringe (100) according to claim 1 , wherein the syringe (100) contains the drug.

3. The syringe (100) according to claim 1 or 2, wherein the pitch (p) of the thread profiles (105a, 105b) is 1,6 mm.

4. The syringe (100) according to any of claims 1 to 3, wherein the plunger stopper (103) is made of an elastomer having a Young's modulus within the interval 25 MPa to 200 MP a.

5. The syringe (100) according to any of the preceding claims, wherein the plunger rod (104) is made of a ihermoplastic polymer having a Young's modulus within the interval 900 MPa to 2000 MPa.

6. The syringe (100) according to any of the preceding claims, wherein a thread angle (a) of the thread profile (105a) for the plunger rod (104) is larger than 30°.

7. The syringe (100) according to any of the preceding claims, wherein a separation angle (β) of the thread profile (105a) for the plunger rod (104) is larger than a threaded drive angle (γ) of the thread profile (105a) for the plunger rod (104).

8. The syringe (100) according to claim 7, wherein the separation angle (β) is within the interval 45 "± 25 °.

9. The syringe (100) according to any of claims 5 to 8, wherein the threaded drive angle (γ) of the thread profile (105a) for the plunger rod (104) is 15 °.

10. The syringe (100) according to any of claims 5 to 9, wherein the separation angle (β) of the thread profile (105a) for the plunger rod (104) is different from the separation angle (β) of the thread profile (105b) for the plunger stopper (103).

11. The syringe (100) according to any of claims 5 to 10, wherein the depth (d) of the thread is 0.5 mm.

12. The syringe (100) according to any of claims 1 to 4, wherein the form of the thread is hemispherical.

13. The syringe (100) according to claim 12, wherein the depth (d) of the thread is 0.S mm.