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Biomedical subjects

I F Hawkins

Publications and source records attributed to I F Hawkins.

At least 91 records · Page 5Linked to original sources
PubMed1984

Single-step placement of a self-retaining "accordion" catheter.

The "accordion" catheter was developed as an adjunct to the Hawkins needle guide to provide safe single-step percutaneous drainage. The Hawkins needle guide is a long, 22-gauge "skinny" needle-cannula system that can be used like any other skinny needle. It can also be used for drainage catheter placement. The accordion catheter is a 6.5 French Teflon catheter with a sigmoid tip. With the use of monofilament, the sigmoid tip can be retracted into a "T" configuration to prevent dislodgment. The 22-gauge needle guide, preloaded with an accordion catheter, can be manipulated safely while the drainage target is located. Then the accordion catheter can be advanced into the target over the needle guide. The "accordion" is easily formed, even in small targets. Successful drainage was achieved in 127 of 131 drainage procedures in which this technique was used. Sepsis did not occur as a complication in any of these procedures.

Abscess↗
PubMed1983

Radiologic imaging of osteosarcoma: role in planning surgical treatment.

We reviewed radiographic studies of 50 central osteosarcomas to assess their accuracy and contributions to surgical treatment planning. Accurate anatomic delineation was especially important when limb-sparing tumor resection was considered. The plain roentgenograms yielded most of the diagnostic information, and often showed large masses located so that major neurovascular involvement was inevitable. Conventional tomography added little. Computed tomography (CT) usually was accurate in showing tumor extent and relationships to major nerves and vessels. However, CT was less useful when vessels were not seen, when edema and hemorrhage (especially after biopsy) blurred tumor margins, or when tumor margin and soft tissue planes blended together without clear definition. Angiography was essential when vascular relationships were unclear on CT. Scintigraphy occasionally revealed subtle intra-marrow tumor extension, but nonspecific increased uptake beyond the true tumor limits was more common than occult tumor spread.

Adolescent↗
PubMed1983

Radiology of medullary chondrosarcoma: preoperative treatment planning.

We evaluated the radiologic studies of 30 medullary chondrosarcomas with respect to their accuracy in diagnosis and surgical staging. There were 30 sets of plain radiographs, 14 conventional tomograms, 26 radionuclide bone scans, 19 arteriograms, and 15 computed tomograms (CT). Plain radiographs provided most of the diagnostic information although many tumours looked benign. CT provided the most complete anatomic staging, including intra- and extraosseous tumor, and neurovascular involvement. However, it was difficult to be sure about subtle soft tissue invasion. Arteriography remained useful for evaluating major vessel involvement or cortical penetration when CT and conventional tomography were equivocal. Scintigrams disclosed increased uptake, usually corresponding to the true tumor extent; "extended uptake" beyond the tumor was uncommon. Conventional tomography has been largely replaced by CT, but was occasionally useful when the tumor was near the end of a bone.

Adult↗
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↗
PubMed1983

New coaxial exchange guide wire with a variable-length tip.

A new coaxial exchange guide wire, which has a variable-length, flexible "J"-shaped tip for exchanging drainage catheters in both large and small structures, is described. The design provides a gradual transition from the softness of the tip to the stiffness of the cannula. The system is presently available in two sizes (0.89 mm [0.035 in.] and 0.64 mm [0.025 in.]) and can also be used as a catheter end-hole dilator.

Biliary Tract↗
PubMed1983

Control of hypertension by ethanol renal ablation.

Five patients underwent therapeutic renal ablation with intraarterial injection of ethanol as treatment for uncontrollable systemic hypertension. All patients either showed complete resolution of the hypertension or improved medical manageability of the hypertension became possible. Ethanol appears to cause permanent renal ablation by cell death while decreasing the risks associated with other embolization techniques.

Adolescent↗
PubMed1982

Percutaneous cholecystostomy.

Percutaneous cholecystostomy was performed in 13 patients; five patients had suspected acute cholecystitis and eight patients had suspected obstruction of the common bile duct. An anterior abdominal wall approach was used in nine patients, right anterior axillary line puncture in four. One patient developed peritonitis and fatal septic shock after inadvertent cholecystostomy catheter removal. None of the other patients became septic, developed peritonitis, or had any other complication related to cholecystostomy. Two of the patients had external drainage as outpatients for more than 6 months without complication. Technical and clinical points are reviewed.

Adolescent↗
PubMed1982

Carbon dioxide digital subtraction arteriography.

Arterially injected carbon dioxide coupled with digital subtraction fluoroscopy consistently produced clinically useful images of arteries in 17 patients. Occasionally good parenchymal images and venograms were also obtained. The buoyancy of the gas requires that the area of interest be in a nondependent position to insure good arterial perfusion. The exceedingly low viscosity of gas should permit delivery of the CO2 via microcatheters which would lessen the risk of arterial injury. CO2 does not produce hypersensitivity reactions and, even in large volumes, should not produce the discomfort associated with iodinated contrast material.

Adenocarcinoma↗
PubMed1981

The value of angiography in planning surgical treatment of bone tumors.

Evaluation of 314 angiograms revealed that they were often very useful in planning nonablative resection of bone tumors because they demonstrated the relationships of the tumors to major vessels. Increasing experience indicates that computed tomography can accurately define intraosseuous and soft-tissue extent of bone tumors. If vascular relationships are not precisely shown by computed tomography, angiography may still be required. The angiograms occasionally also helped in anticipating operative blood loss, demonstrating variants of vascular anatomy, or planning biopsy. Meticulous angiographic technique and close communication between surgeon and angiographer are essential.

Bone Marrow Diseases↗
PubMed1981

Radiological evaluation of chondroblastoma.

Eleven new and six recurrent chondroblastomas were studied with multiple radiological imaging methods (plain radiography, conventional tomography, computed tomography, radionuclide bone scanning, and angiography). When the plain radiographic appearance was typical, conventional tomography or computed tomography (CT) was helpful, but other studies were not. Periosteal reaction and angiographic hypervascularity were common and did not indicate cortical breakthrough. For large, aggressive, or atypical lesions, conventional tomography and CT were helpful in delineating anatomic extent, and angiography was of value in demonstrating major vessel displacement. Radionuclide bone scanning was not useful.

Angiography↗