DE7534483U - Ureter prosthesis - Google Patents
Ureter prosthesisInfo
- Publication number
- DE7534483U DE7534483U DE19757534483 DE7534483U DE7534483U DE 7534483 U DE7534483 U DE 7534483U DE 19757534483 DE19757534483 DE 19757534483 DE 7534483 U DE7534483 U DE 7534483U DE 7534483 U DE7534483 U DE 7534483U
- Authority
- DE
- Germany
- Prior art keywords
- ureter
- prosthesis
- section
- cross
- urine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2002/047—Urethrae
Description
Prof. Dr.-Ing. Joseph H. Spurk, 6123 Bad König, Ober-Kinzig,Prof. Dr.-Ing. Joseph H. Spurk, 6123 Bad König, Ober-Kinzig,
Außerhalb 3Outside 3
\ Dr. med. Dietger Jonas, 6 Frankfurt/M., Paul-Ehrlich-Str. 50
Dipl.-Ing. Manfred Sellmann, 6101 Nieder-.Ramstadt, Auf dem Sand 3 \ Dr. med. Dietger Jonas, 6 Frankfurt / M., Paul-Ehrlich-Str. 50
Dipl.-Ing. Manfred Sellmann, 6101 Nieder-Ramstadt, Auf dem Sand 3
HarnleiterprotheseUreter prosthesis
Die Erfindung bezieht sich auf eine Harnleiterprothese. Eine
solche kann bekanntlich anstelle eines pathologischen Harnleiterabschnittes implantiert werden, damit der Urin von der Niere wieder
in die Blase abgeleitet werden kann (innere Harnableitung).The invention relates to a ureter prosthesis. One
As is well known, this can be implanted instead of a pathological ureter section so that the urine can be drained from the kidney back into the bladder (internal urinary drainage).
Der Urintransport geschieht beim natürlichen Harnleiter peristaltisch,
d.h. in einem Urinbolus, der sich mit praktisch konstanter Geschwindigkeit durch den Harnleiter bewegt. Eine Harnleiterprothese
sollte so beschaffen sein, daß der Urinbolus ohne große Druckerhöhung im Harnleiter in die Hariileiterprothese eintreten kann, da
man annimmt, daß diese ständig wiederkehrende Druckerhöhung für die oft beobachtete Aufweitung des Harnleiters und des Nierenbeckens
verantwortlich ist und zum Verlust der Niere führen kann.In the natural ureter, urine is transported peristaltically, ie in a urine bolus that moves through the ureter at a practically constant speed. A ureter prosthesis should be designed in such a way that the urine bolus can enter the ureter prosthesis without a great increase in pressure in the ureter, since it is assumed that this constantly recurring increase in pressure is responsible for the widening of the ureter and the renal pelvis, which is often observed
is responsible and can lead to the loss of the kidney.
Bei den bisher verwendeten Harnleiterprothesen (meistens Silikonkautschukschläuch?) ging man davon aus, daß sich die Druckerhöhung vor der Harnleiterprothese nach dem Hagen-Poiseuille-Gesetz bestimmt (European Surgical Research 4: 138 (1972)) und legte deren Innenquerschnitt so aus, daß die hieraus berechnete Druckerhöhung nicht unzulässig groß wurde.With the ureter prostheses used so far (mostly silicone rubber tubing?) it was assumed that the pressure increase in front of the ureter prosthesis was determined by the Hagen-Poiseuille law (European Surgical Research 4: 138 (1972)) and designed its internal cross-section so that the pressure increase calculated from it did not become unacceptably large.
Das Hagen-Poiseuille-Gesetz (s.o,) liefert für laminare stationäre Strömung gute Ergebnisse; man kann aber (rechnerisch oder experimentell) zeigen, daß für praktische Durchmesser die Druckerhöhung vor der Harnleiterprothese aufgrund des instationären CharaktersThe Hagen-Poiseuille law (see above) provides for laminar stationary Flow good results; but one can show (arithmetically or experimentally) that the pressure increase for practical diameters in front of the ureter prosthesis due to its unsteady character
Blatt IISheet II
7534413 15.QA.767534413 15.QA.76
Blatt IISheet II
der Strömung der dominierende Effekt ist.the flow is the dominant effect.
Der Erfindung liegt die Aufgabe zugrunde, die instationäre Druckerhöhung vor der Harnleiterprothese möglichst gering zu halten.The invention is based on the problem of the unsteady pressure increase to be kept as low as possible in front of the ureter prosthesis.
Die Aufgabe wird erfindungsgemäß durch eine in Strömungsrichtung veränderliche Innenquerschnittsflache gelöst: Vom Harnleiterende her gesehen erweitert man die Innenquerschnittsflache der Harnleiterprothese über einen kurzen Diffusor auf die Nennquerschp.ittsfläche. According to the invention, the object is achieved by one in the direction of flow Variable inner cross-sectional area solved: Seen from the end of the ureter, the inner cross-sectional area of the ureter prosthesis is expanded through a short diffuser onto the nominal cross-sectional area.
Im folgenden ist ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die Gebrauchsmusterzeichnung näher beschrieben« Die Maße des Harnleiterendes werden zweckmäßige*tfeise so gewählt, daß der natürliche Harnleiter gerade noch über die Harnleiterprothese geschoben und mittels bekannter Invaginationstechniken befestigt werden kann. Der öffnungswinkel des sich anschließenden Diffusors wird möglichst groß gewählt; eine obere Grenze ist jedoch durch die Gefahr der Strömungsablösung gesetzt, die Inkrustationen zur Folge haben kann. Vom Diffusor bis zum Blasenende ist die Prothese mit konstantem Innenquerschnitt ausgeführt (Nennquerschnitt). Aus anatomischen Gründen ist die Harnleiterprothese am Blasenende gekrümmt.The following is an embodiment of the invention by reference described in more detail on the utility model drawing. The dimensions of the end of the ureter are expediently chosen so that the natural ureters just pushed over the ureter prosthesis and secured using known intussusception techniques can be. The opening angle of the adjoining diffuser is chosen to be as large as possible; however, an upper limit is set by the There is a risk of flow separation, which can result in incrustations. The prosthesis is included from the diffuser to the end of the bladder constant internal cross-section (nominal cross-section). For anatomical reasons, the ureter prosthesis is curved at the end of the bladder.
Um die instationäre Druckerhöhung vor Harnleiterprothesen gering zu halten, sind genügend große Innenquerschnittsflachen erforderlich. Eine dieser Forderung genügende zylindrische Prothese ist entweder garnicht oder nur über eine Voroperation zur Aufweitung des Harnleiters implantierbar. Die Erfindung erzielt den Vorteil einer einfachen Implantation und eines ii? Mittel genügend großen Innenquerschnittes, bei dem die beim ürintransport auftretenden instationären Druckerhöhungen gering sind.In order to keep the transient pressure increase in front of ureter prostheses low, sufficiently large internal cross-sectional areas are required. A cylindrical prosthesis that satisfies this requirement is either not at all or only through a previous operation for expansion of the ureter implantable. The invention achieves the advantage of simple implantation and a ii? Means big enough Internal cross-section in which the unsteady pressure increases that occur during urine transport are small.
7534483 15.04767534483 15.0476
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19757534483 DE7534483U (en) | 1975-10-30 | 1975-10-30 | Ureter prosthesis |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19757534483 DE7534483U (en) | 1975-10-30 | 1975-10-30 | Ureter prosthesis |
Publications (1)
Publication Number | Publication Date |
---|---|
DE7534483U true DE7534483U (en) | 1976-04-15 |
Family
ID=31952943
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19757534483 Expired DE7534483U (en) | 1975-10-30 | 1975-10-30 | Ureter prosthesis |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE7534483U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2851010A1 (en) * | 1977-11-28 | 1979-05-31 | Abbou Clement Dr | FULL OR PARTIAL URETERAL DENTURES |
-
1975
- 1975-10-30 DE DE19757534483 patent/DE7534483U/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2851010A1 (en) * | 1977-11-28 | 1979-05-31 | Abbou Clement Dr | FULL OR PARTIAL URETERAL DENTURES |
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