CN2077727U - Memory alloy support for curing hyperplasia of prostata - Google Patents

Abstract

The utility model belongs to a medical appliance and is mainly used for treating prostate hyperplasia. A memory alloy supporting frame for treating the prostate hyperplasia adopts cone spiral tubes which are made of titanium and nickel alloy wires whose transition temperature is between 35 centigrade degrees and 40 centigrade degrees. The spiral tube adopts rare screw pitches, and the diameter of the minor diameter end of the spiral tube is a normal urethra diameter; so the quantity of expanding the diameter is big, the quantity of venting urine is big, and no urine is left. Because the titanium nickel alloy has good organic compatibility and is hard to generate lithiasis, so the utility model can be used as a permanent supporting frame for treating the prostate hyperplasia.

Description

Memory alloy support for curing hyperplasia of prostata

This utility model belongs to medical apparatus and instruments, and is especially relevant with the support used of treatment hyperplasia of prostate.

Hyperplasia of prostate is one of common frequently-occurring disease of old people, is a kind of benign tumor, and clinical manifestation is that opening of bladder blocks, urine retention, and dysuria, patient is very painful, adopts prostatectomy usually.But some patient should not undergo surgery because of suffering from some disease, has to adopt non-open operation Therapeutic Method, and this method easily causes urinary system infection.In order to make the prostate patient recover the ability of independently urinating, the someone has designed the helical stent that places prostate inside, to reach the inflated prostate urethra, and the function that need perform the operation and can make the hyperplasia of prostate patient recover independently to urinate not.This support is made with stainless steel silk, it is made up of three parts, first is a solid matter serpentine pipe 1, head is taper, is positioned in the prostate 6 part urethras, and second portion is a straight line portion 2, between sphincter 4, third part is two turns 3, is arranged in bulbar urethra, so that support is difficult for entering bladder 5, though use this support can make controlled micturition unimpeded, independently urinate, but have following shortcoming: ［ 1 ］ this support is difficult for inserting and aims at corresponding position, causes the incontinence of urinating easily, complication such as frequent micturition, ［ 2 ］ it is a kind of temporary stent, can not place in the body for a long time, make urethra narrow again, take out difficulty otherwise easily form calculus, ［ 3 ］ external diameter of this kind support must be less than the internal diameter of urethra tube, so the hole enlargement amount is less, voided volume is also little, and residual urine is arranged.

The purpose of this utility model is to design a kind of support that hyperplasia of prostate is used for the treatment of, and this support can the inflated prostate urethra, can forever be placed on again in patient's body, to keep long-term efficacy.

The support that the treatment hyperplasia of prostate of this utility model design is used is a kind of cone-type spiral pipe, serpentine pipe is rare screw thread, pitch is between 0.2 millimeter to 1.5 millimeters, the diameter of the serpentine pipe minor diameter one end diameter with normal urethra basically is identical, the diameter that the diameter of serpentine pipe larger diameter end is equal to or slightly greater than bladder place prostate-urethra generally can increase the 0.5-1.5 millimeter, stent length is looked patient's prostatic urethra length and difference, generally between the 40-75 millimeter.Serpentine pipe forms with the Ti-Ni memory alloy wire coiling of transition temperature between 35-40 ℃, and the restoring force that utilizes memorial alloy to produce when shape is recovered comes dilating urethra.

The support that Fig. 1 uses for existing treatment hyperplasia of prostate and the sketch map of bladder urethra relative position.

The support that Fig. 2 designs for this utility model and the sketch map of bladder urethra relative position.

Fig. 3 is the enlarged drawing of Fig. 2 medium-height trestle.

Fig. 4-5 sketch map of inserting the patient position for support per urethra approach.

Below in conjunction with accompanying drawing embodiment of the present utility model and effect thereof are further described.Fig. 2 is the sketch map that the support 21 of this utility model design is inserted the patient's bladder relevant position.Fig. 3 is the enlarged drawing of support.The support 21 of design is the cone-type spiral pipe that forms with the Ti-Ni memory alloy wire coiling of transformetion range between 35-40 ℃.The Ti-Ni diameter of alloy wire can be selected in 0.3-0.7 millimeter scope as required, the big more expansionary force to urethra of diameter is big more, but diameter is crossed conference and is caused wire rod intensity to make expansionary force excessive too greatly, and excessive owing to deflection in operating process, surpass the recovery limit and make a material be difficult for restoring to the original state.The diameter of the smaller diameter end of cone-type spiral pipe is identical with the diameter of the normal urethra of patient, is generally 6 millimeter.The diameter of the larger diameter end of conical screw pipe is equal to or slightly greater than the diameter of bladder place prostate-urethra, be generally 7 millimeter, on the one hand being in order to strut the prostate part urethra that the internal urethral orifice place charges into to intravesical, also is simultaneously that support moves down in order to prevent to urinate.Because the diameter of serpentine pipe is equal to or slightly greater than the diameter of normal urethra, the urethral dilatation amount is big, and support is difficult for moving to the bladder direction.The length of serpentine pipe is then looked patient's prostatic urethra length difference and difference, generally between 40-75 millimeter scope.Serpentine pipe adopts rare screw thread, and pitch is between 0.2 millimeter-1.5 millimeters, and the rigidity that the size of pitch had both influenced support also influences the compatibility between epithelium covering and support and tissue.Pitch reduces, and can increase stiffness of support, but to mucosa cover support as early as possible, to form slick inner membrance unfavorable, easily generates calculus; Otherwise stiffness of support reduces, and forms slick inner membrance but be beneficial to, thereby can avoid forming calculus, makes support become fixed support, and support more can not move up or down.

Use 0.5 millimeter of diameter, transition temperature is that 35-40 ℃ Ti-Ni alloy filament winding is made the two ends diameter and is respectively 6 millimeters and 7 millimeters, pitch is several cone-type spiral supports of 0.4 millimeter, each stent length is respectively 45,55,60,75 millimeters, the support of making is inserted patient's corresponding site by following two kinds of methods and step.

［ 1 ］ per urethra approach: with the capable mucous membrane of urethra of 1% Anethaine 2ml anesthesia back with the urethral probe urethral dilatation of going ahead of the rest.Utilize the Ti-Ni alloy characteristic of soft easy deformation at low temperatures at this moment, in about 0-10 ℃ brine ice support 41 is twined in 15F, on the conduit 7 of the many side openings of front end band, elder generation is with the self-control 22F conduit 8 of built-in 18F catheter, adopt the per urethra approach to insert bladder, the intravesical urine is drawn.0-10 ℃ of brine ice 200ml of intravesical perfusion makes bladder and urethra cooling then, pulls out the 18F catheter, inserts the support tube conduit 7 that has twined 15F in frozen water.Under monitoring, x-ray tv pulls out conduit 8 outside the back, location, and then the conduit 7 by front end band side opening is to urethra and 45 ℃ of warm water of intravesical perfusion, under TV, observe support shape recovery situation, recover not exclusively can improve the perfusion hot water temperature as shape and reach 50 ℃, if backing positions is improper, can under TV, adjust by urethral probe.

［ 2 ］ through the bladder approach: after cutting bladder, insert support tube in the internal urethral orifice direct motion by the per urethra procedure operation, postoperative saline drop washed bladder 3 days promptly had unobstructed urine to discharge in 10 days.

5 routine patients are inserted prostate-urethra because of the BPH urine retention with the support of this utility model design, and wherein 1 example is through the bladder approach, 4 routine per urethra approach, and after inserting, check of bladder urethra and urine flow rate all recover normal than checking.Per urethra approach person urinates flow rate at once and recovers normal, begins to train bladder in 7 days through bladder approach operator, pulls out bladder creating-fistula in 12 days, and urethra is urinated, and it is normal that the flow rate that has urine examined is recovered, and urethrography shows enough roomy internal diameter.Narrow disappears, and follows up a case by regular visits to after surgery 1-2 month, looks into X-ray film and does not see that calculus forms, and it is normal to urinate, no residual urine.

For hyperplasia of prostate patient in various degree, can select φ 0.3 Ti-Ni alloy silk for use to 0.7 millimeter of φ, coiled pitch 0.2,0.5,0.7,1.0,1.5 millimeters cone-type spiral pipe can obtain same ideal curative effect.

Because the diameter with normal urethra is identical basically for the diameter of its miner diameter end of support of design, so the hole enlargement amount is big, voided volume is big, and the phenomenon of residual urine can not take place.Because the existing peculiar memory performance of Ti-Ni alloy, super-elasticity and good corrosion resistance, the favorable tissue compatibility is arranged again, the support of design adopts rare thread forms again, make mucosa very easily by the mucosa of growing between pitch, has good histocompatibility, ordinary circumstance is difficult for forming calculus, therefore, support can become the permanent support of dilation therapy hyperplasia of prostate, support adopts soft at low temperatures Ti-Ni memory alloy wire to make the cone-type spiral shape, both be convenient to twine at low temperatures and be beneficial to insert, be convenient to support again and insert the back because of taking-up at that time of position, it is a kind of apparatus of ideal treatment hyperplasia of prostate, and the patient who treats that is particularly suitable for undergoing surgery uses.

Claims (2)

1, a kind of treatment hyperplasia of prostate helically coiled memory alloy stent, it is characterized in that said support is a kind of cone-type spiral pipe, the diameter of cone-type spiral pipe miner diameter end is normal urethra diameter, the diameter of cone-type spiral pipe bigger diameter end is equal to or slightly greater than the diameter of bladder place prostate-urethra, the length of serpentine pipe is between the 40-75 millimeter, the pitch of serpentine pipe is between the 0.2-1.5 millimeter, and said serpentine pipe forms with the Ti-Ni alloy filament winding system of transition temperature in 35-40 ℃ of scope.

2, by the said support of claim 1, the diameter of bigger diameter end that it is characterized in that said cone-type spiral pipe is than the big 0.5-1.5 millimeter of diameter of miner diameter end.

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