EP3215294A1 - Procede et dispositif de fabrication de canules - Google Patents

Procede et dispositif de fabrication de canules

Info

Publication number
EP3215294A1
EP3215294A1 EP15801342.5A EP15801342A EP3215294A1 EP 3215294 A1 EP3215294 A1 EP 3215294A1 EP 15801342 A EP15801342 A EP 15801342A EP 3215294 A1 EP3215294 A1 EP 3215294A1
Authority
EP
European Patent Office
Prior art keywords
electrolyte
cannula
penetrating
ecm
grinding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15801342.5A
Other languages
German (de)
English (en)
Inventor
Philipp Bauer
Sascha KUNER
Werner Saule
Frank Schienle
Martin Weber
Robert ZSCHALER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rena GmbH
Original Assignee
Rena GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rena GmbH filed Critical Rena GmbH
Publication of EP3215294A1 publication Critical patent/EP3215294A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
    • A61B17/3421—Cannulas
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3286—Needle tip design, e.g. for improved penetration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/08—Sharpening
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00526—Methods of manufacturing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
    • A61B2017/3454—Details of tips
    • A61B2017/3456—Details of tips blunt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte

Definitions

  • the present invention relates to a method of making cannulas and cannulas made using the method. Furthermore, the invention relates to a device which is suitable for the production of the cannulas using the method.
  • Cannulas usually have a sharp piercing tip as well as outer cutting edges, but may also be configured without a sharp tip and without outer cutting edges, as shown e.g. in the case of epidural cannulas.
  • the rear end of the cannula opening which is often referred to as the heel end or eye, is usually elliptical. Since the inner side edges and the rear elliptical edge of the eye are sharp, in particular medical cannulas, which are pierced through the skin or by other materials, always the tendency to separate punching particles from the skin or other materials.
  • DE-OS 26 00 299 discloses a cannula and a method and an apparatus for its production.
  • the cannulas are obtained by using a conventional bevel cut from a tube section and have in the rear of the cannula opening (penetrating edge) rounded inner edges, these roundings are created by the use of brushes with abrasive properties.
  • the device comprises a rotating brush with a plurality of bristles provided with an abrasive agent, or a brush, which is supplied with abrasive material, and a clamping plate for releasably attaching a plurality of cannulas to a support plate as a receiving surface.
  • the bristles work one after another the openings multiple needles to round off and dull the inner side edges in the rear of the cannula openings and the posterior edges (eyes) thereof. There is thus a limited brushing of the cannula openings only in the area of the indentation edges.
  • a disadvantage of this solution is that it is not possible to rotate the cannulas in the device to allow not only the oblique cut but also a double-sided side grinding in the front portion of the cannula opening by so-called facet grinding.
  • Another significant disadvantage of the proposed method results from the mechanical treatment steps by using grinding wheels and brushes. In this case, the needles inside are contaminated with abrasive wear and also experience a mechanical load by the direct contact with the grinding wheel or the bristles of the brush, whereby additional steps of processing are required.
  • the patent DE 103 27 067 B4 also describes a method for the simultaneous production of several cannulas, which are held side by side and spaced apart on a holding device.
  • the grinding of the cannulas takes place successively or simultaneously by grinding and / or erosion. It is proposed to deburr the bevel by fine sand blasting or glass bead blasting, with it to Contamination of the cannulas comes, which must be removed consuming in subsequent steps.
  • On editing (rounding) of the rear end of Kanegaff (heel end, eye) is not discussed in this document.
  • the patent DE 10 2011 112 021 B4 describes the production of a low-puncture cannula using a novel cannula grinding. It is stated that the punching problem is solved by applying the set cutting technique, which leads to a special tip geometry, so that a separate or integrated processing of the rear end of the cannula opening for rounding or deburring thereof is not discussed.
  • the object of the present invention is to provide a method and a device by means of which cannulas, in particular those with a rounded rear end of the cannula opening, can be produced more easily.
  • Another aspect of the problem is solved by providing a cannula prepared accordingly.
  • cannulas are provided by separating segments of a hollow tube and applying a mostly multi-stage grinding or cutting technique to one end of each of the segments, the separation being effected in a conventional manner by means of machining methods such as cutting. Cut-off grinding or sawing, or by electro-erosion (spark erosion, sink EDM, wire erosion, in this case also referred to as EDM) can take place.
  • the configuration of the cannula tip is referred to herein as a top grinding and usually comprises three consecutive cuts, namely the single cut, which is present in all cannulas and with which a blunt end of a severed tube segment undergoes a first bevel, and, depending on the later application of the finished Cannula, if desired, a left and a right facet cut or relief grinding to produce the outer penetrating or cutting edges, wherein the two facet cuts can also be made simultaneously depending on the technique used for this purpose.
  • the single grinding as well as the two lateral facet cuts by means of cutting processes, in particular by use of grinding or cutting wheels, by electroerodulation (EDM) such as in particular wire or die sinking, by electrochemical removal (in this case also referred to as ECM), or by using a combination of the aforementioned techniques.
  • ECM electroerodulation
  • ECM electrochemical removal
  • the essential aspect of the present invention is to electrochemically process (round, round) the rear end of the cannula opening, also referred to as the heel end or eye thereof, by ECM This leads to two process alternatives, which are explained in more detail below.
  • ECM electrochemical machining
  • electrochemical polishing belongs to the group of electrochemical removal processes, but both methods differ in essential points. While predominantly acidic electrolytes (eg mixtures of sulfuric acid and phosphoric acid) are used in electropolishing, neutral electrolytes (saline solutions, eg sodium nitrate) are predominantly used in the ECM.
  • the distance from electrode to workpiece is very small in the ECM process, usually in the range of 0.05 to 1 mm, whereas in electropolishing, it is considerably larger than 1 mm.
  • the current densities in ECM are usually significantly higher than in electropolishing (A / cm 2 compared to mA / cm 2 ). These differences ultimately result in one different purpose of the two methods.
  • the electropolishing is used for planar smoothing, the ECM for local removal.
  • burrs are produced using cut-off or grinding wheels to produce the single cut and / or the two side facet cuts which are conventionally mechanically followed, e.g. must be eliminated by glass bead or fine sand blasting.
  • the eye must be rounded and the contaminants on and / or in the cannula must be cleaned of grinding and blasting.
  • the cannulas can alternatively or subsequently be subjected to electropolishing (in the present case also referred to as EP).
  • the single-cut and / or the lateral facet-cuts can be brought about by using EDM, in particular by wire or sink EDM, while the eye is subsequently processed electrochemically by means of ECM according to the invention.
  • EDM electrochemically by means of ECM according to the invention.
  • no burrs which subsequently occur e.g. be removed by blasting again, and there would be no contamination or obstruction of the cannula by mechanical grinding or cutting, which is why in addition to the blasting and the usual electropolishing could be omitted; however, the EDM technique is a slow process and suitable devices are relatively expensive, which is why this technique is not well suited for inexpensive mass production of cannulas, yet is encompassed by the present invention.
  • the Abtragsmenge by increasing the electrode surface and current flow in limited Scope can be freely scaled, whereas the material removal in the EDM technology by means of sparks is only selective.
  • the material is always removed using EDM where the distance between the wire and the workpiece is smallest, roughnesses can be efficiently smoothed and very precise contours can be produced, which is particularly advantageous in creating sharp edges and tips.
  • the removal of material using electrochemical removal (ECM) takes place in principle where the electric field lines are closest, which is the case in particular in the region of the edges of a cannula tip, whereby certain areas thereof can be rounded in the desired manner.
  • ECM electrochemical machining
  • ECM and EDM in this order or vice versa
  • simplified devices can be used and dispensed with time-consuming re-clamping a plurality of pipe segments to be processed, since the workpieces to be machined only once in a workpiece carrier, which is part of a device according to the invention is or can be introduced as a compatible system component in the different processing stations or modules of such a device, to be clamped.
  • a device suitable for this embodiment comprises two (for ECM / EDM; EDM / ECM) polarizable tool electrodes, means for contacting and polarizing the cannulas or tube segments to be machined (Workpieces), as well as the required for the implementation of ECM and EDM if necessary fluids (electrolyte solution, dielectric) or at least functional elements or modules, by means of which the liquids can be supplied to the intended site of action. If EDM is not used (alone), the device alternatively or additionally comprises suitable means for grinding.
  • a suitable device preferably comprises only one ECM-compatible tool electrode and only the electrolyte solution and / or means for supplying the same. If it is intended to protect certain areas of the cannula tip completely or in a restricted manner from the action of ECM on the material of the cannula, in particular in the successive application of EDM and ECM or the application of ECM for alternatively produced by eg conventional grinding single and / or or facet grinding, or when ECM is used for all cuts (single and, if desired, facet cuts), the apparatus further comprises a suitable means for masking, shadowing or protecting the areas which are not or only slightly attenuated by ECM can be that they can not be contacted by the used for processing by ECM electrolyte liquid or only in attenuated such as diluted form.
  • liquid (s) in one or in the case of the combination of both techniques can alternatively also be provided in two containers.
  • one or both liquids can also be provided in another way in the machining gap between the workpiece and the tool, as will be described in detail below.
  • ECM electrochemical machining
  • the charge transport in the machining gap is taken over by an electrolyte solution, eg an aqueous solution of sodium chloride (NaCl) or preferably sodium nitrate (NaN0 3 ).
  • an electrolyte solution eg an aqueous solution of sodium chloride (NaCl) or preferably sodium nitrate (NaN0 3 ).
  • NaCl sodium chloride
  • NaN0 3 sodium nitrate
  • the dissolved metal ions then undergo anode (cannula) reactions with portions of the cleaved electrolyte while the electrolyte residue at the cathode (tool electrode) reacts with water resulting in undesirable deposits such as metal hydroxide as end products.
  • electrochemical ablation (ECM) according to the invention is used, in particular, to round the elliptical eye created by the single cut produced in the rear area of the cannula opening on the inside.
  • ECM electrochemical ablation
  • the smallest cannulas have an outer diameter of about 0.25 mm, it is currently extremely difficult, if not impossible, to fabricate, as a tool cathode, an electrode as a tool cathode that is small enough to have its electrochemical activity only in the interior of the tool Auges unfolded and can be positioned according to exactly the desired site of action. If the electrode is larger or wider than the area to be rounded in the posterior portion of the anterior, beveled cannula opening, undesirable material removal outside of the eye and deposits can occur.
  • the cannulas or areas to be shaded such as by grinding / cutting and / or eroding
  • cannula tips produced during their optionally further processing by means of ECM from the outside with a non-conductive liquid such as DI water, with a liquid which has a sufficiently low conductivity, or to flow with water and provide the Elektrolytström in the lumen of the cannulas, which is why a suitable Device via means or elements such as a pressure chamber has, by means of which the electrolyte can be preferably initiated by the non-machined end of the tube segment in the lumen thereof.
  • the rinsing or masking liquid is passed through the cannula or the workpiece, while the cannula or the workpiece is flowed or flowed around from outside with electrolyte.
  • stamp, seals or the like made of, for example elastomers, silicones, rubber etc. and, for example, the tip geometry are protected under subsequent treatment with ECM by the (sharp) tip, for example, introduced into a pillow and can no longer be contacted by the electrolyte in this way.
  • the pad can be pressed by a threaded rod or a pneumatic cylinder against the pointed end of the cannula or the workpiece such that its or tip penetrates with their protected areas in the pad, so that these areas protected from contact with the electrolyte are.
  • Equally expedient would be a movement of the cannula or of the workpiece via a change in position of the workpiece carrier in the direction of the pillow or a movement of both objects (pillow, cannula) towards each other.
  • the pad, the stamp or the seal (s) can be attached to the device or a module thereof including the workpiece carrier or fixedly connected to the electrode.
  • the pad may be configured as a preferably flat plate or even more preferably as a roller, so that the cannulas or workpieces can always be provided with unrebated areas of the pad in the course of continuous processing by corresponding rotation of the roller.
  • the pad may optionally be preformed so that the cannulas or workpieces can rest against it without, however, piercing the pad.
  • this partial masking or shadowing is basically only needed in the cases or embodiments where ECM is applied after the cannula tip has already received its final shape. If, therefore, the invention most preferred, even the single cut and, consequently, the rounding of the eye by means of ECM can be dispensed with a subsequent masking. In exceptional cases in which, for example, too much ablation in the area of the eye leads to an undesired sharpening of the edge, or in cases where the generation of the facet cuts takes place by application of ECM (see above), a corresponding masking or shadowing or rinsing can take place However, especially at the end of the ECM process duration, be displayed.
  • this measure basically relates to the outer wall of the tube segment, and the electrolyte is provided within the cannula (in the lumen thereof).
  • the electrolyte may also affect the interior of the tube segment or areas of the cannula opening, in particular those in the penetration part, while the electrolyte is the exterior or outer regions of the segment or the cannula flows around.
  • a cannula according to the invention with an ECM-rounded eye is not known in the prior art, which is why the invention also relates to such a cannula, in which the posterior edge (eye) and at least bilaterally adjacent regions of the eye (side edges resulting from single-pass) up to the optional facet cuts are truncated or rounded as such.
  • the method according to the invention and the device presented here are thus well suited for a simple and cost-effective production of cannulas for medical purposes.
  • This method is simple by eliminating the conventionally additional processing steps and the need for multiple insertion and re-clamping of cannulas in different devices or in workpiece carriers as a component or functionally associated component of the device.
  • the method according to the invention can also comprise a further electropolishing step for deburring, sharpening and / or polishing, in which case preferably only one appropriately equipped device is used which, in addition to the aforementioned components or modules, additionally comprises a container with an electrode ( Cathode of eg stainless steel) for receiving an acidic electrolyte (for example, mixtures of H 2 SO 4 / H 3 PO 4 / H 2 O) comprises.
  • a container with an electrode Cathode of eg stainless steel
  • an acidic electrolyte for example, mixtures of H 2 SO 4 / H 3 PO 4 / H 2 O
  • FIG. 1 shows the known steps for producing a cannula tip 2 from a tube segment 1.
  • To produce a point grinding first of all the single cut 3 (on the left in side view, on the right in plan view), followed by the two facet cuts 4 (left) and 5 (right) to be attached laterally to the single cut.
  • To produce the single cut 3 the tube segment 1 is in zero position with respect to its longitudinal axis, while it is rotated around its own longitudinal axis in each case at a defined angle, but with opposite direction of rotation, to produce the two facet cuts 4 and 5 10 ° and 90 ° from the zero position and can be selected customer-specific.
  • FIG. 2 schematically illustrates the method of electrochemical removal (ECM).
  • ECM electrochemical removal
  • FIG. 2B shows the effect of the rounding brought about by ECM in the rear region of the cannula opening.
  • a cannula is shown in side view, which after application of EDM and / or conventional grinding only a single cut or a finished top grinding including two facet cuts, the rear portion of the cannula opening has a sharp eye 11, whereas from ECM a rounded or rounded eye 12 is obtained.
  • the right figure also shows that the tip of the cannula, i. the protruding end of the cannula tip 2 obtained by single-pass or top-grinding is still sharp.
  • the areas not to be processed are externally supplied with water or rinsed while the cannula is e.g. via a pressure chamber from the inside with electrolyte 7 is applied or flowed through.
  • the electrode e.g. a beam electrode 14 is positioned in front of the eye, and the electrolyte 7 emerging from the rear of the cannula opening forms an electrolyte bridge between the eye and the electrode 14. The further one moves away from the eye towards the tip, the stronger becomes the electrolyte 7 through the Water dilution diluted, whereby a smooth, smooth transition between areas with removal and such is obtained without erosion.
  • the electrolyte 7 is accordingly (largely) undiluted, which is why the removal is greatest here, which is also desirable for rounding the eye.
  • the elongated extent of these different areas to be treated can be influenced by adjusting the ratio between the flow of electrolyte and the flow of water, in each case ensuring that the peak geometry of the penetrating part obtained by the grinding is largely retained. This is achieved by these areas are not contacted by the electrolyte 7 or only in a very dilute manner, so that no significant removal can take place here.
  • a comb electrode 15 which protrudes into the eye, can alternatively also be used with a larger pipe diameter.
  • the tube segment 1 should be sufficiently flowed as shown in Figure 4 in the abzifagenden area of a possible undiluted electrolyte 7, to which the interior (lumen) of the tube segment 1 is acted upon or flowed through with electrolyte 7.
  • an electrode 6 can be used, which is designed to flow through with electrolyte 7 and has bores through which electrolyte 7 can be supplied to the workpiece 9.
  • ECM electroerodizing
  • all cuts of the top sharpening can be produced by means of ECM.
  • ECM electrochemical ablation
  • one or two further ECM steps for producing the facet cuts are carried out according to the ECM single-cut described above.
  • the electrochemical ablation in principle rounds edges and points, all the edges, and in particular the point produced by the single-cut, if they are in contact with the electrolyte, would be round.
  • it may also be desirable in the context of this embodiment to provide a corresponding flush with water which For example, with reference to Figure 5 can be done by the tip flows with water 13 or rinse and thus prevents the removal of the tip.
  • the tube segments are clamped at a certain lateral distance from each other in the workpiece carrier of the device, it is possible to produce the facets on both sides simultaneously in one step, wherein the spatial configuration of the electrode 6 is then make according to the desired tip geometry, as shown in FIG 5A is shown.
  • the desired sharpness of the tip and the edges in the penetration part can be brought about by means of electropolishing (EP).
  • EP electropolishing
  • FIG. 5B An alternative procedure for the simultaneous production of both facet cuts after already done single grinding is shown in FIG. 5B.
  • the cannula is flushed from the inside with, for example, water, while it is flowed around from the outside with electrolyte.
  • the water flow guided in the lumen of the cannula emerges from the cannula opening in the direction of the tip, it is mixed more and more with the electrolyte in the direction of the tip, as well as from the outside in, whereby its concentration is greatest in the area desired for producing the facet cuts, which is positively supported by the use of an angled electrode.
  • the area of pure water in the liquid jet at the eye is as wide as the pipe inside diameter and decreases successively and evenly towards the tip.
  • FIG. 6 compares the conventionally produced cannula tips with the superior properties of a cannula tip according to the invention.
  • FIG. 6A is an illustration of a conventionally-created cannula tip with well-defined ridge residues, while in the illustration of FIG the further elliptical (sharp) shape of the rear and clearly inwardly bent portion of the cannula opening (sharp eye 11) of a conventional standard cannula is shown.
  • the illustration according to FIG. 6C represents the area of an eye 12 rounded in accordance with the invention by means of ECM.
  • FIGS. 6D and 6E the respective front penetrating part with its tip and its sharp edges (tip geometry) is of equal design in both versions.
  • the ECM machined opening portion has both a rounded or truncated one posterior edge (rounded eye) as well as rounded or truncated inner edges, which affect the areas immediately adjacent to the eye, or even, as shown, extend to the facets.
  • the inner edges of the entire opening portion of a standard cannula continue sharp-edged, while these single cut edges 17 are also rounded in a cannula tip according to the invention as shown in Figure 6E, wherein an at least partially flat configuration of the opening part is not a contradiction to the teaching of the invention, if at least the rear edge (Eye) is rounded without mechanical means such as brushes, which leave in the area in question grooves or grinding marks, etc., were used.
  • FIG. 7A shows a workpiece carrier 18 for holding, optionally twisting, and contacting pipe segments 1 and for transporting workpieces between individual process stations or modules of a device in a side view.
  • the tube segments 1 are clamped between two strips 19 and 20, wherein one of these strips, in the present case referred to as a displaceable strip 20, preferably displaced in opposite directions, perpendicular to the workpieces can be rotated, whereby the workpieces clamped in zero position with respect to their longitudinal axis after generation of the single grinding to create the two facet cuts can be rotated to the left or right.
  • this is preferably coated with a polymer 21.
  • the displacement of the bar 20 by means of a pneumatic or electric actuator (not shown) and is monitored by a measuring device 22.
  • the sliding strip 20 opposite contact strip 19 is made of a conductive material or has at least a conductive coating and is used in addition to holding and possibly twisting the pipe segments 1 contacting the pipe segments 1 or workpieces for electrochemical ablation (ECM) and a possibly provided Electro-EDM (EDM).
  • ECM electrochemical ablation
  • EDM Electro-EDM
  • the strips 19 and 20 must be uniformly compressed with a defined contact force, which can be done for example by means of springs or pneumatically.
  • the workpiece carrier 18 has at least one positioning element (not shown), for example in the form of a pin or rod.
  • the positioning elements or compatible recording devices such as a zero voltage device or a prism.
  • the arrangement of the workpiece carrier 18 in a station or in a module of the device can be horizontal or vertical, depending on the nature of the same or the same.
  • ECM, EDM, EP processing stations or modules
  • FIG. 7B shows a workpiece carrier with clamped tube segments in a vertical arrangement with a pressure chamber 24, with which electrolyte 7 is introduced into the lumen of the tube segments and, if necessary, flushing, masking or shading of non-machinable outer regions of the tube segments above the electrode 6, which if necessary .
  • Can be acted upon with a medium flow can be made with water 13.
  • the tube segments are preferably both from the inside and through the electrode from the outside through with or flowed through, while optionally above the eye is streamed or flushed with water can be, the water flows preferably laminar along the workpiece. In this way, it can be ensured that a workpiece carrier equipped with pipe segments or workpieces does not need to be immersed in a medium.
  • FIG. 7C shows a segment of such a pressure chamber or the pressure chamber 24 according to FIG. 7B with a tube segment 1. It consists of two half-shells 25 with an elastomeric seal on the sealing surfaces, wherein the half-shells 25 are open for changing a workpiece carrier (left) and closed during processing (right).
  • the pressure chamber 24 is preferably part of each ECM process station, but may also be provided as a module, which is transported together with the workpiece carrier between the various stations or modules of the device and can be fed from there, compatible receiving means with the desired liquid.
  • FIG. 7D shows a side view of the arrangement of pressure chamber 24, workpiece carrier 18, electrode 6 and purging device 27.
  • the flow through the pipe segment 1 or workpiece 9 is carried out with electrolyte via the pressure chamber 24 from the inside, while the rinse With water via a rinsing nozzle 27 above the eye from the outside happens, the water laminar should wash around the area to be protected from erosion and deposition. However, it may be necessary to ensure that the electrolyte is not or at least not diluted too much by the water rinse at the intended action for him. The extent of the flushing accordingly depends on the specific requirements of the areas to be treated and the areas to be protected if necessary, and may be selectively limited to, for example, certain areas of the cannula opening or applied to the entire cannula tip. Below the workpiece carrier 18, a drive for rotating 26 of the pipe segments 1 within the workpiece carrier 18 is shown below the workpiece carrier 18, a drive for rotating 26 of the pipe segments 1 within the workpiece carrier 18 is shown.
  • EDM electro-erosion
  • a conventional wire or die-sinking EDM machine can be used, wherein a corresponding module can also be part of the device or this functionally assigned.
  • the machine or the module is equipped with a clamping device for selectively horizontal or vertical recording of the workpiece carrier and optionally with a prescribed pressure chamber for purging the pipe segments or workpieces from the inside.

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Abstract

La présente invention concerne un procédé de fabrication de canules et des canules fabriqués en utilisant le procédé. En outre, l'invention concerne un dispositif qui est approprié à la fabrication de canules en utilisant le procédé. Le procédé concerne la fabrication d'une canule constituée d'un segment de tube creux (1), pourvu d'une extrémité de pénétration oblique qui comporte une partie de pénétration avant et une partie d'ouverture arrière, la partie de pénétration avant ayant une surface biseautée qui s'étend vers l'arrière depuis la pointe de pénétration et qui comporte des bords latéraux intérieurs, et la partie d'ouverture arrière ayant une surface biseautée qui s'étend vers l'arrière depuis la surface biseautée de la partie avant et des bords latéraux intérieurs et un bord arrondi arrière (10, 12), l'arrondi du bord arrière (10, 12) étant réalisé par retrait électrochimique (ECM) en présence d'un électrolyte.
EP15801342.5A 2014-11-07 2015-11-05 Procede et dispositif de fabrication de canules Withdrawn EP3215294A1 (fr)

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DE102014116287.0A DE102014116287A1 (de) 2014-11-07 2014-11-07 Verfahren und Vorrichtung zur Herstellung von Kanülen
PCT/EP2015/075804 WO2016071441A1 (fr) 2014-11-07 2015-11-05 Procede et dispositif de fabrication de canules

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EP (1) EP3215294A1 (fr)
JP (1) JP2017537798A (fr)
KR (1) KR20170117017A (fr)
CN (1) CN107073616A (fr)
DE (1) DE102014116287A1 (fr)
TW (1) TWI677391B (fr)
WO (1) WO2016071441A1 (fr)

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US11491565B2 (en) * 2019-12-23 2022-11-08 Metal Industries Research & Development Centre Probe forming device
TWI732612B (zh) * 2020-06-30 2021-07-01 財團法人金屬工業研究發展中心 探針加工方法
KR102321265B1 (ko) * 2021-04-30 2021-11-03 주식회사 두원필터 식모기 바늘 가공방법

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CN107073616A (zh) 2017-08-18
TWI677391B (zh) 2019-11-21
DE102014116287A1 (de) 2016-05-12
JP2017537798A (ja) 2017-12-21
TW201628747A (zh) 2016-08-16
WO2016071441A1 (fr) 2016-05-12
US20180317959A1 (en) 2018-11-08
KR20170117017A (ko) 2017-10-20

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