Method and device for producing cannulas
A technology of needles and equipment, which is applied in the field of manufacturing needles and can solve problems such as inability to rotate needles
Inactive Publication Date: 2017-08-18
RENA
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
However, this solution has the disadvantage that the needle cannot be rotated in the device in order to be able to grind it laterally on both sides in the front section of the needle hole by so-called facet grinding in addition to bevel grinding.
Another obvious disadvantage of the method described is that the machining step is carried out by using abrasive discs and brushes.
For this purpose, the needle is soiled on the inside with abrasives and is also mechanically stressed by direct contact with the abrasive disk or the bristles of the brush, thus requiring additional processing steps
Method used
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Embodiment Construction
[0031] exist figure 1 The known steps for producing a needle tip 2 from a tube segment 1 are shown in . To fabricate the peak tip grinding, single grinding 3 (side view on the left, top view on the right) is first performed, and then facet grinding 4 (left) and 5 (right) are introduced from both sides of the single grinding. To produce a single grind 3, the tube segment 1 is in zero position with respect to its longitudinal axis, while to produce two facet grinds 4 and 5, the tube segment is each rotated around its own axis at a defined angle, but in opposite directions of rotation. Rotation of the longitudinal axis, wherein the angle can be between 10° and 90° from the zero position and can be selected according to customer requirements.
[0032] exist figure 2 The working principle of electrochemical ablation (ECM) is schematically shown in . exist figure 2 A tube segment 1 shown on the left as workpiece 8 is polarized as an anode, which is polarized by means of an ele...
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The present invention relates to a method for producing cannulas as well as cannulas that have been produced by applying the method. Furthermore, the invention relates to a device which is suitable for producing cannulas by applying the method. The method relates to the production of a cannula from a hollow tube segment (1), comprising an oblique penetrating end which has a front penetrating part and a rear opening part, wherein the front penetrating part has a beveled surface, which extends rearward from a penetrating tip and has internal lateral edges, and wherein the rear opening part has a beveled surface, which extends rearward from the beveled surface of the front part and has internal lateral edges as well as a rounded rear edge (10, 12), wherein the rounding of the rear edge (10, 12) is made by electrochemical machining (ECM) in the presence of an electrolyte.
Description
technical field [0001] The invention relates to a method for producing needles and needles produced by the method. The invention also relates to equipment suitable for the manufacture of needles using this method. Background technique [0002] The needle usually has a sharp point and an outer cut edge, but it can also be configured without a sharp point and without an outer cut edge, as is the case, for example, with epidural needles. The rear end of the pinhole, also commonly referred to as the heel end or eyelet, is generally oval in shape. Because the inner side edges of the eyelets and the rear oval edges are sharp, in particular medical needles that pierce the skin or other material always have a tendency to detach the punched particles from the skin or other material. [0003] Various techniques are known in the prior art, such as glass bead and fine sand blasting and in particular needle grinding, by means of which the stamping tendency can be reduced. [0004] DE-...
Claims
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IPC IPC(8): B23H9/08B23H3/00
CPCB23H9/08B23H3/00A61M5/3286A61B17/3421A61B2017/00526A61B2017/3456B23H1/00
Inventor P·鲍尔S·库尔W·绍乐F·沈乐M·韦伯R·泽沙勒
Owner RENA