Why Does a New Syringe Have an Open Piston?

  • Context: High School 
  • Thread starter Thread starter Leodoc
  • Start date Start date
  • Tags Tags
    Piston Syringe
Click For Summary

Discussion Overview

The discussion revolves around the design of new syringes, specifically why the piston is not completely closed. Participants explore potential reasons for this design choice, considering both practical and scientific explanations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants suggest that the open piston may prevent adhesion to the front wall of the syringe.
  • One participant questions whether the open piston is a consistent feature across all new syringes, noting variability in design.
  • Another participant shares personal experience, indicating that leaving syringes partly open can prevent sticking, although they are unsure if this applies to new syringes.
  • Concerns are raised about the potential for contamination affecting the functionality of the piston seal.
  • One participant emphasizes that their use of syringes is not for medical purposes, but rather for inks and photographic solutions.

Areas of Agreement / Disagreement

Participants express differing views on the reasons for the open piston design, with no consensus reached on whether it is a standard feature or its implications for functionality.

Contextual Notes

There is uncertainty regarding the consistency of the open piston design across different syringe types, as well as the effects of contamination and user experience on the performance of the piston.

Who May Find This Useful

Individuals interested in syringe design, practical applications in photography, or those curious about the mechanics of syringes may find this discussion relevant.

Leodoc
Messages
2
Reaction score
2
Why the piston in a new syringe is not completely closed,,?
Is it just because of to differentiate from New one or it just have a scientific reason
 
Physics news on Phys.org
I am just guessing, but it may be to prevent adhesion to the front wall.
 
Dale said:
I am just guessing, but it may be to prevent adhesion to the front wall.
May be,, because even after not completely closed it well tight..
 
Last edited by a moderator:
Leodoc said:
Why the piston in a new syringe is not completely closed,,?

Are you sure that this is always the case?
 
Leodoc said:
Why the piston in a new syringe is not completely closed,,?
Is it just because of to differentiate from New one or it just have a scientific reason
Welcome to the PF.

Can you say more about your question? Using Google Images or Google Shopping, I see new syringes that are fully closed and some that are open a little.

https://cdn-1.au.xmsymphony.com/4d9c396d11102d97ff4226a2e42b15a4/contents/V00064/insulin-syringe.jpg

insulin-syringe.jpg
 

Attachments

  • insulin-syringe.jpg
    insulin-syringe.jpg
    20.8 KB · Views: 563
I leave syringes partly open because they sometimes stick. I don't know if this would happen with new ones, or whether it is due to slight contamination remaining after use. (Despite washing.)
My reason, based on experience of not doing it, is that I can press hard and break the seal/bond, but if I pull the rubber gets pulled off the plastic plunger.

Just in case PC PF people are worried, I do not use these for medicines nor anything like that! Mainly inks and aqueous solutions for photographic processes.
 
  • Like
Likes   Reactions: berkeman

Similar threads

Plumbing Syringe/Stepper Motor Pump Design
  • · Replies 9 ·
Replies
9
Views
7K
Graduate Difficulty extracting fluid from balloon via syringe
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Work in hydrostatic system in cylinder with piston: P_int or P_ext?
  • · Replies 5 ·
Replies
5
Views
2K
Fluid Dynamics: Calculating Speed and Force in Syringe Experiments"
  • · Replies 2 ·
Replies
2
Views
4K
High School Vacuum Audio Failure: Solutions & Tips
  • · Replies 26 ·
Replies
26
Views
3K
Undergrad Trying to wrap my head around gas turbine thermodynamics
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad Irreversible adiabatic processes & entropy change (clarification needed)
  • · Replies 22 ·
Replies
22
Views
6K
Automatic Window Opener - how does it work?
  • · Replies 11 ·
Replies
11
Views
6K
Undergrad Why work is PdV and not (P+dP)dV in an isothermal process?
  • · Replies 6 ·
Replies
6
Views
938
Modeling Air Compression Cylinder
  • · Replies 45 ·
2
Replies
45
Views
7K