A blunt end represents the most simple cannulas end. It results from a clean and precise cut. Blunt ends are often associated with reduced cylindrical tip for liquid pipetting and sampling probes.
We are able to cut the tube or wire in pieces of length varying between 0.2 and 2'000 [mm] and may guarantee, upon request, a tolerance of ± 0,02 [mm]. Our standard tolerances however are as follows;
- ± 0,5 [mm] for lengths up to 300 [mm]
- ± 1 mm for lengths longer than 300 [mm].
A.1 Blunt end – square cut
Our standard cutting and deburring process slightly takes the sharpness off the cutting edge, resulting in an slightly radiused edge of about R 0.02 mm
With the most advanced grinding and controlled deformation techniques, Unimed is able to offer you the conical tips shown below. The conical ends may be obtained:
- by grinding, removing some material, and thus reducing the wall thickness (A.4 & A.5)
- by reducing, through deformation, keeping the wall thickness constant. (B.2.2)
A.4 Blunt end – conical (tapered)
This will leave a small portion of the tube wall (not a sharp edge).
A.5 Conical end with sharp edge
To achieve the cutting edge we propose a standard grinding angle of about 20°
The common points shown below are the most commonly found on the market. As a specialized manufacturer of medical needles and sampling probes, Unimed may offer and grind, according to your specifications, each of the geometries shown below:
A.9 Non-coring bevel
In order to reduce the effect of coring the tissue or material during penetration, the heel of the bevel is blunted by grit blasting. This anti-coring treatment can be applied to any type of bevel.
In addition to the common points, Unimed has highly diversified its production apparatus and technologies in order to be able to manufacture, to your needs, the most complex and less usual ends geometries as follows;
B.2.1 Reduced Cylindrical Tip
Often used in liquid handling applications, tip openings can be as small as 0.1 mm with a standard precision of as tight as +/- 0.02 mm
B.2.3 Spherical Tip
Tube ends can be partly or fully closed, either with constant wall thickness (hollow end) or with tubing end filled inside.
B.3.1 Normal Flare End
We can also provide Set Flare Ends with a specific conical configuration, for sealing, when the cone has to fit into a corresponding matching part
B.3.2 Flanged End
90° flanged tubes create a relatively accurate OD stop, e.g for insertion into another tube or part. Allow for a radius of about 0.2 mm under the flange.
Tubular parts can be supplied with one end, or indeed any location, flattened. The flattened section can be on the center line of the tube, or offset. The resulting flat width and thickness are relative to the tubing size. Flats can be provided with pierced holes.