Published On: Tue, Aug 30th, 2011

ABS insert molded dual-channel prostate biopsy needle guide for new prostate biopsy system

Envisioneering Medical Technologies, a developer and manufacturer of diagnostic and treatment guidance systems for the medical industry,

has introduced the new TargetScan Touch System for prostate imaging and biopsy as a more effective, precise, and systematic alternative to traditional hand-held trans-rectal ultrasound (TRUS) biopsy systems.

A main feature of the new TargetScan Touch System is the dual-channel prostate biopsy needle guide, which is insert molded by Plas-Tech Engineering Inc, a custom molder of medical devices based in Lake Geneva, Wisconsin, the US.

As introduced, Envisioneering’s new diagnostic and treatment system combines proprietary robotic ultrasound technology with the capability to perform precise, targeted prostate biopsies and treatments. The TargetScan Touch System is a stereotactic prostate biopsy system to employ mapping technology combined with 3-D image acquisition.

Leveraging the TargetScan Touch biopsy coordinates, physicians can target and monitor any planned points and preferred zones in the prostate throughout the patient’s course of care. Unlike random sampling, this systematic approach supports multi-sample, repeatable biopsies, targeting precise locations, according to the press release.

The dual-channel prostate biopsy needle guide is a key component which is mounted to the biopsy system hardware. It is composed of two 13-gauge stainless steel tubes which are insert molded with acrylonitrile-butadiene-styrene (ABS) resin. The tight-tolerance part is 6″ long and has an inner diameter of 0.071″, said Plas-Tech.

The disposable needle guide serves as the pathway for the bendable biopsy needle to the target tissue. It is precisely formed to provide a consistent geometry for the needle to pass through, according to Michael Belgeri, Director of Operations for Envisioneering Medical Technologies. “The part has a complex geometry which requires tight sealing at four locations, with a smooth flash-free finish for patient comfort.”

A critical factor was defining the processing requirements of the metal tubes, according to Scott Smith, VP of Sales and Marketing for Plas-Tech Engineering. The company’s quality team performed a detailed analysis of samples from the metal tube supplier, which resulted in the pairing of the tubes for placement in the mold to be eliminated. As stated, the tubes can be randomly selected since they are all within required tolerances for insert molding. This effort reduced the cost of the finished product.

Among the key processing challenges was positioning the parts correctly in the mold and filling completely without blowing the stainless steel tubes out of position and creating flash across the holes, Plas-Tech said. Core pulls are sequenced appropriately and shutoffs and inserts are high tolerance. Stainless steel tube bends and ID are held to +0.001″. The ABS grade is FDA approved, offering strong dimensional stability and compatibility with ethylene oxide sterilization.

Further introduced by the company, the TargetScan Touch System allows the physician to insert a biopsy needle in the targeted area, and monitor both the accuracy of the biopsy needle position and the specific location of the tissue sample captured by the biopsy needle. Images can be captured and stored by the system to verify the location of the tissue samples.

 

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