Cannula Point Styles

The casing is a stainless steel tube with a blunt back end (proximal end) and a pointed/machined "business" end (distal end). Blank ends blunt. The needle (kit) is produced by connecting the casing to the hub (kit). High quality tubing is essential for successful casing and needles. Welded and plug - drawn, fully hard tempered tubes maximize the hardness, tensile strength and surface finish of the casing. In addition, this manufacturing process is critical to obtaining the best quality parts when the casing is cold-worked a second time, such as pipe forging, bending, flaring, diameter grinding, or forming. Here are some common casing tip styles. Ask for more details or request a casing style change. Some casings have size limitations.

Common Point Styles of Cannulas

Graphical description. Actual appearance may vary depending on pipe/line sizes and customer specifications. Marked tubes are not standard, customer needs to provide product specifications if required.

Bias Grind

A single grind or cut point. Angle must be specified and is measured from longitudinal axis unless otherwise noted.

Vet Point

Point is sharpened on back and side of lumen. Primarily for life science and industrial applications with loose tolerances. Gauges smaller than 22 (.028" OD) or thin walls less than .005" cannot be effectively hand sharpened. Also commonly known as lab point style #4 or reverse grind. Primary bevels are machine ground and small volumes are hand sharpened without tolerances. Larger quantities are machine ground and have tolerances applied to primary bevels and rotation angles. Standards: Regular Bevel: 12-15° primary bevel angle, Short Bevel: 18-20°, Quincke Bevel: 25-30°.

Lancet Point

CNC ground. Sharpened on front of lumen. Consistent geometry and cost effective at volume. Standards: Regular (A) Bevel: 12-15° primary bevel angle, Short (B) Bevel: 18-20°, Quincke (C) Bevel 25-30°. Custom primary angles and angles of rotation available.

Bias Grind

Vet Point

Lancet Point

Deflected Point (Anti-Coring)

Mainly used to reduce diaphragm penetration when coring. The "Huber" point is approximately parallel to the vertical axis after the main inclined plane is deflected to the cavity.

Pencil Point

The rotary mold is pressed to the smallest plane, then sharpened and polished. Applicable size limits. Some geometry may require custom tools to create and incur modest engineering costs. Typically, the customer will specify a hole or slot near the nozzle for the liquid or gas to pass through.

Closed End Consistent Wall

Forming sealing spherical end. Typically, the customer will specify a hole or slot near the nozzle for the liquid or gas to pass through.

Bullet Point

Tapered, non-sharp point. A variation of a swaged (reduced) but not closed end is also possible.

Razor Edge

Proprietary technology provides a vastly superior sharp edge, often used for biopsies or precision dispensing.

Trocar

Three faces form a sharp point. For applications with tubing, a two piece welded assembly is typical.

Trephine

Primarily used for bone biopsies, tube is ground on three sides to create a sharp tip as diagrammed. This variation is also available with two sides (double bevel) or 4 faces.

Menghini

CNC ground with a primary bevel between 20º and 40º, and a secondary bevel formed 360º around the lumen. Primarily used for liver biopsy equipment or similar applications in order to permit sample removal without device rotation.

Ball End

Hermetically sealed spherical end. Usually selected for cost or when consistent wall is not available due to size limitations.

Depending on the style, the normal delivery time may vary from a few days to a few weeks. As an option for rapid prototyping and small batch production, Manners can produce the desired tip style in 1-2 weeks or less, depending on needle size and availability of the machine operator. Please let us know if delivery time is of utmost importance to you and we will quote according to your delivery requirements.