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Biomedical subjects

P T Hunter

Publications and source records attributed to P T Hunter.

11 recordsLinked to original sources
PubMed1987

Acute mechanical dilation of the ureter: an experimental study.

Forty-three kidney donor ureters were mechanically dilated in vitro with Van Buren sounds to an average of 21.2F. Thirty-three of these ureters, with an average pre-dilation diameter of 11.3F, could be dilated an additional average of 10.6F. The average dilated/nondilated diameter ratio in these ureters was 1.9. These experimental data suggest an undilated pelvic ureteral diameter and a manually dilated ureteral diameter of approximately the same size cited in the clinical literature.

Adult↗
PubMed1987

The ureteral access system: a review of the immediate results in 43 cases.

The ureteral access set was used 43 times during an 18-month period between 1984 and 1985. Stones lodged throughout the ureter and in the renal pelvis were extracted with a success rate of 51 per cent. Of the upper tract strictures 92 per cent were dilated successfully. Filling defects were diagnosed in 88 per cent of the cases. Foreign bodies were retrieved, Double-J stents were placed and biopsies were successful in each case. Ureteral perforation in 28 per cent of the cases was caused by the dilator in 8 of 12 (19 per cent over-all). The technique and short-term results are discussed. Long-term followup data are not yet available.

Catheterization↗
PubMed1986

Renal stone disease treated with extracorporeal shock wave lithotripsy: short-term observations in 100 patients.

The immediate posttreatment findings are described for 100 patients who underwent extracorporeal shock wave lithotripsy (ESWL) for renal stone disease. Excretory urography was performed both before and 24-72 hours after ESWL. In 21 patients, stones were completely disintegrated, and stone fragments were passed rapidly. Stones were fragmented but not passed entirely within 24-72 hours in 76 patients. There was no appreciable effect on stones in three patients. In nine of 27 patients who had mild to severe ureteral obstruction caused by stone fragments, relief procedures (retrograde ureteral manipulation or percutaneous stone extraction) were necessary. Overall, 70 patients experienced successful stone disintegration without complications. Continued investigation is needed to determine prevalence of residual calculi, reversibility of acute effects of ESWL on the kidney, and possible development of late hypertension.

Female↗
PubMed1985

Retrograde nephrostomy and percutaneous calculus removal in 30 patients.

We used a new technique, retrograde nephrostomy, to provide intrarenal access for percutaneous calculus removal in 30 consecutive patients. Under fluoroscopic control, we maneuvered cystoscopically a 5F and 9F coaxial catheter pair over a guide wire into the calix selected for nephrostomy. Then, a sheathed 20 to 21 gauge needle was passed through the 9F catheter into the flank to create the nephrostomy. Eight patients were given general and 22 intravenous sedation and local anesthesia for nephrostomy placement and calculus removal. Retrograde nephrostomy and subsequent calculus removal were completed successfully in 90 and 83 per cent of the 30 patients, respectively. There were 6 complications and 3 failures among the first few patients due to inferior equipment and inexperience with the technique. Over-all, we found that retrograde nephrostomy provided reliable, precise intrarenal access and we believe that it could become an alternative technique to aid in percutaneous calculus removal procedures.

Adult↗
PubMed1984

New monofilament and soft-wire baskets for stone removal.

A new-design basket for stone removal uses a standard Teflon catheter with radially positioned holes at its tip to hold either monofilament or soft wire. The strands are positioned to form a basket that will change in both size and shape simply by advancing or retracting these strands. This basket is much safer, can be changed in size during maneuvering , will transmit instruments for stone fragmentation, and can be advanced over a guide wire. It has been effective both in vitro and in the retrieval of biliary and urinary tract stones in 20 patients, several of which could not be retrieved by standard methods.

Animals↗
PubMed1983

New monofilament basket for bladder calculi.

Successful stone manipulation was facilitated with the new monofilament basket in experimental situations and in patients. Advantages over other baskets include: in vivo adjustability, reduced mucosal trauma, ability to irrigate and aspirate through the basket, and ability to pass lithotriptor electrodes within the basket. Basket modifications under study might prove useful within the ureter, renal pelvis, and biliary tree.

Animals↗
PubMed1983

Hawkins-Hunter retrograde transcutaneous nephrostomy: a new technique.

Retrograde nephrostomy, a new technique to aid in stone management, has been performed successfully in dogs. It has also been used without complication in a human patient to help remove a renal stone percutaneously under local anesthesia. The technique consists of placing a coaxial catheter over a guidewire under fluoroscopy into the exact calyx desired and advancing a long needle out to the skin to establish a transcutaneous tract. The advantages of the technique include increased control and precision of tract placement, efficient working angles for percutaneous stone removal, and the ability to perform the procedure under local anesthesia.

Animals↗