Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical energy applicator
Patent
1997-11-12
2000-09-12
Dvorak, Linda C. M.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical energy applicator
607101, 623 11, A61F 200, A61N 104
Patent
active
061190454
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
Prostate trouble, such as benign prostate hyperplasia (BPH) or chronic prostatism are found normally among men. In many cases the symptoms are experienced as very troublesome, and therefore numerous different forms of treatments have been developed. Several of these result in transitory trouble for some time after treatment.
The invention relates to a device for maintaining a passage for urine through the prostate gland as claimed in claim 1.
PRIOR ART
The purpose of microwave treatment and other heat treatments of the prostate gland is to accomplish an amount of dead tissue in the gland. The dead tissue is discharged in different ways, mainly through the urethra together with urine.
In connection with the treatment it is not unusual that an acute retention of the urinary tracts occurs to the patient. This is a result of a swelling of the heat treated prostate gland which closes the drain of urine. The effect can remain for a few months and is very troublesome to the patient.
To ensure a drainage of urine also during this period of time it is presently a normal step to insert a urine catheter during the time there is a swelling of the gland. Though there is a drain of urine according to this method the catheter as such is a problem to the patient.
DESCRIPTION OF THE INVENTION
An object of the present invention is to limit the risk of the troubles described above after treatment of the prostate gland. This object has been achieved according to characteristics of claim 1.
According to the invention a stent or sleeve or similar element is inserted in the prostate gland during the treatment. The sleeve is left after a completed treatment and remains in position during the time the tissue is swollen.
Preferably the sleeve is performed as a helical winding made of a material which after some time delay is desolved in contact with body tissue. An example of such a material is polyglycol acid (PGA). It is also possible to use a flexible tube.
DETAILED DESCRIPTION
According to the invention there is used a so called expanding stent or similar device, such as a flexible tube, which after completed treatment is attached along the prostatic urethra within the prostate gland in such a way that it prevents the swollen tissue from closing the drain of urine, instead maintaining an opening for a drain of urine.
The FIGURE shows an embodiment according to the invention using a stent 12 formed as a helical thread made of a suitable material. The stent 12 is arranged externally on a catheter 10 which during treatment is inserted through the urethra until a tip 15 has entered into the bladder 14. A balloon 16 following the catheter 10 into the bladder 14 is expanded through a duct in the catheter 10 to hold the catheter 10 in position in relation to the prostate gland 13. Within the catheter 10 there are provided means 11 for heating prostate tissue to such an extent that some tissue will be dead. Said means 11 preferably comprise a microwave antenna. To avoid too much dead tissue in the vicinity of the antenna cooling ducts can be provided in the catheter 10. Another way of providing a desired heating is to circulate heated liquid in a section of the catheter 10 positioned within the prostate gland, or in a separate container 18 of the catheter. It is also possible to provide separate heating means locally at the area of treatment and thereby to accomplish a local heating without any demand of cooling of surrounding tissue. The heating means may e.g. be some type of antenna which emits radio signals of a frequency in the interval 0,1-1000 MHz, or a volume of a liquid which is heated by a heating element.
The sleeve or the stent 12 is provided on the outside of the catheter 10. The stent 12 comprises a thread of a material that will be desolved in the tissue. The thread is winded in a helical winding. Preferably the inner diameter of the stent 12 is somewhat larger than the outer diameter of the catheter 10 to allow the stent 12 to slide comparatively freely on the outside of the catheter, and the ou
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Dvorak Linda C. M.
Gibson Roy
ProstaLund Operations AB
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