BLOCKWISE PMC Marker Band Positioning

BLOCKWISE PMC Marker Band Positioning View Large Image

The Blockwise marker band positioner / precrimper model PMC is a tabletop machine that slides bands along a catheter inner member or other substrate to position them, then lightly precrimps the bands into a hexagonal shape to hold them in position prior to swaging. The band positioner / precrimper model PMC uses a simple, reliable, mechanical approach to positioning bands, with no optical sensors or vision systems. The PLC control software can be set up by a novice in just a few minutes. In a typical application, the product consists of an “inner member” (plastic tube) slipped over a mandrel, with two bands placed on the mandrel. In a typical operating sequence (after setting up a recipe in the PLC) the operator places the catheter inner member with bands into the side-loading gripper and the mandrel into the crimper, then presses the START button. The crimper closes, and the operator touches the tip of the inner member against the face of the crimper dies (providing a position reference for the machine), then presses the START button again. The machine then uses the crimper, with almost zero closing force, to gently slide the bands, as a group, along the inner member to a known position. Then, one-by-one, the crimper is used to grab the outside of each band to move it away from the group, then push the band into position using the face of the crimper dies, then precrimp the band into a hexagonal shape.

Cycle time depends on the process settings; typical cycle time for PTCA-type catheters is about 28 seconds. The 6-jaw crimper has 3 crimp-force settings that are used and commanded by the PLC: •a high crimp force (diameter-limited) for precrimping the bands into a hexagonal shape, •a low crimp force for grabbing the outside of a band that’s adjacent to another band without deforming the band, •a very low (almost zero) force used when sliding the bands along the catheter by pushing them with the face of the dies. The inner member is not harmed by the dies when sliding the bands. Typical Cycle Time: •2 bands PTCA-type Catheter 28 seconds Standard Deviation: •Band to band distance .028mm Allowable Number of Bands: •1 to 9 Band Diameter Range: •0.3 to 4.0mm Maximum Tip-to-Band Distance Setting: •290mm Side-Loading Gripper Die Material: •Acetal Copolymer Plastic 6-Jaw Crimper Die Material: •Hardened Stainless Steel Control System: •PLC with LCD Operator Interface Screen and Keypad Machine Dimensions: •26 inches wide x 12 inches deep x 14 inches tall Sequence Control: •Programmable Relay Service Connections: •AC Power 120 v or 240 v, 2A Compressed Air: •5 to 7 bar

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