WO2005102217A1 - Ureteric stent - Google Patents

Ureteric stent Download PDF

Info

Publication number
WO2005102217A1
WO2005102217A1 PCT/GB2005/001461 GB2005001461W WO2005102217A1 WO 2005102217 A1 WO2005102217 A1 WO 2005102217A1 GB 2005001461 W GB2005001461 W GB 2005001461W WO 2005102217 A1 WO2005102217 A1 WO 2005102217A1
Authority
WO
WIPO (PCT)
Prior art keywords
stent
ureter
length
ureteric
stents
Prior art date
Application number
PCT/GB2005/001461
Other languages
French (fr)
Inventor
Ravi P. Kulkarni
Original Assignee
Kulkarni Ravi P
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kulkarni Ravi P filed Critical Kulkarni Ravi P
Publication of WO2005102217A1 publication Critical patent/WO2005102217A1/en

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
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M27/00—Drainage appliance for wounds or the like, i.e. wound drains, implanted drains
    • A61M27/002—Implant devices for drainage of body fluids from one part of the body to another
    • A61M27/008—Implant devices for drainage of body fluids from one part of the body to another pre-shaped, for use in the urethral or ureteral tract
    • 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
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/88—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure the wire-like elements formed as helical or spiral coils
    • 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
    • A61F2002/048—Ureters

Definitions

  • the invention relates to stents, and particularly to ureteric stents.
  • Stents are medical devices which are inserted into tubes in the body, for example an artery, to maintain a specified width for the artery.
  • Ureteric stents are inserted into the ureter, the tube that joins the kidney to the bladder.
  • Ureteric stents are used to prevent or treat obstruction of the ureter resulting from many causes, includes stones and tumours.
  • ureteric stents extend all the way from the kidney to the bladder and are left in place for long periods of time, or even permanently. Encrustations may build up on the stents and the conventional stents also cause side effects.
  • the invention provides a ureteric stent having a length which is less than half that of the ureter.
  • the stent has a length substantially equal to one third of the length of the ureter.
  • the stent has means to retain the stent in a predetermined position within the ureter.
  • the means to retain the stent in position may comprise a portion of the stent which exerts sideways pressure on the wall of the ureter, so that the stent is maintained in position by frictional forces.
  • the said portion of the stent may comprise a spiral coil.
  • the spiral coil is arranged at one end of the stent.
  • One embodiment of stent, for use in the upper or middle third of the ureter may have a spiral coil at each end.
  • Each coil may have a maximum diameter of from 1cm to 2cm and a length of from 1cm to 2cm.
  • a preferred diameter is 6 French and a preferred length is 1cm.
  • the stent may have a substantially straight central region.
  • the central region may have a length of from 3 to 6cms.
  • the lower end of the stent may have one or more threads attached thereto.
  • the threads may be of Nylon.
  • Each end of the central region may be provided with a radio-opaque marker.
  • the stent may be manufactured from PTFE or other biocompatible polymer material.
  • Figure 1 is a perspective view of one embodiment of stent according to the invention.
  • FIG 2 is a perspective view of a second embodiment of stent according to the invention.
  • the embodiment of ureteric stent shown in Figure 1 comprises two spiral coils 10, 11 separated by a central straight section 12.
  • a radio opaque marker 13 At each end of the straight section 12 is a radio opaque marker 13.
  • Nylon threads 14 are attached to the lower end of the stent.
  • the stent is manufactured from PTFE (e.g. Percuflex) and is self-supporting with the configuration shown in Figure 1.
  • PTFE e.g. Percuflex
  • the stent shown in Figure 1 can be inserted into the ureter and in use this embodiment of stent will be positioned in the upper or middle third of the ureter.
  • the larger diameter portions of the stent maintain the ureter with a given width.
  • the spiral coils 10 and 11 apply fight pressure against the walls or the ureter and the stent is thus maintained in position, at the desired location, by frict ⁇ al forces.
  • the stent can be inserted in a conventional manner, for example over a conventional 0.038 inch diameter guide wire, using a conventional pusher.
  • the radio opaque markers 13 enable the location of the stent within the body to be tracked with conventional equipment
  • the nylon threads 14 facilitate extraction of the stent, for example using a flexible cystoscope.
  • the embodiment of stent shown in Figure 2 has a single spiral coil 10 attached to a central region 12. Radio opaque markers 13 are again present. At the lower end of the stent shown in Figure 2 there is a bladder segment 15 to which is attached nylon threads 14.
  • the embodiment of stent shown in Figure 2 is designed for use in the lower third of the ureter.
  • the bladder segment 15 comprises a pigtail shape as used on conventional ureteric stents.
  • the retention effect of the spiral coils is only exhibited within the ureter, where the light pressure can be applied against the wall of the ureter.
  • the lower end of the stent is to lie within the bladder so there is no advantage in using a spiral coil. It is sufficient to use the conventional pigtail which resists movement of the lower end of the stent out of the bladder.
  • Each spiral coil has a length of 1cm and a maximum diameter of 1cm.
  • Each central region 12 has a length of from 3 to 6 cms.
  • the stents according to the invention occupy only the obstructed segment of the ureter and this reduces the risk of irritation and side effects.

Abstract

A ureteric stent is provided by the invention, having a length which is less than half that of the ureter. Conventional ureteric stems extend all the way from the kidney to the bladder and are left in place for long periods of time, or even permanently. Encrustations may build up on the stents and conventional stents also cause side effects. The reduced length stent of the invention causes fewer side effects. In a preferred embodiment, the stent has a length substantially equal to one third of the length of the ureter, and has means (10, 11) to retain the stent in a predetemined position within the ureter. For example at least one end of the stent may be provided with a spiral coil (10 or 11).

Description

URETERIC STENT
The invention relates to stents, and particularly to ureteric stents.
Stents are medical devices which are inserted into tubes in the body, for example an artery, to maintain a specified width for the artery. Ureteric stents are inserted into the ureter, the tube that joins the kidney to the bladder.
Ureteric stents are used to prevent or treat obstruction of the ureter resulting from many causes, includes stones and tumours.
Conventional ureteric stents extend all the way from the kidney to the bladder and are left in place for long periods of time, or even permanently.. Encrustations may build up on the stents and the conventional stents also cause side effects.
I have developed new stents which have the potential to cause fewer side effects.
The invention provides a ureteric stent having a length which is less than half that of the ureter.
Preferably the stent has a length substantially equal to one third of the length of the ureter.
Preferably the stent has means to retain the stent in a predetermined position within the ureter.
The means to retain the stent in position may comprise a portion of the stent which exerts sideways pressure on the wall of the ureter, so that the stent is maintained in position by frictional forces.
The said portion of the stent may comprise a spiral coil. Preferably the spiral coil is arranged at one end of the stent.
One embodiment of stent, for use in the upper or middle third of the ureter may have a spiral coil at each end.
Each coil may have a maximum diameter of from 1cm to 2cm and a length of from 1cm to 2cm.
A preferred diameter is 6 French and a preferred length is 1cm. The stent may have a substantially straight central region.
The central region may have a length of from 3 to 6cms.
The lower end of the stent may have one or more threads attached thereto.
The threads may be of Nylon.
Each end of the central region may be provided with a radio-opaque marker.
The stent may be manufactured from PTFE or other biocompatible polymer material.
By way of example, two specific embodiments of the invention will now be described, with reference to the accompanying drawings in which:
Figure 1 is a perspective view of one embodiment of stent according to the invention; and
Figure 2 is a perspective view of a second embodiment of stent according to the invention. The embodiment of ureteric stent shown in Figure 1 comprises two spiral coils 10, 11 separated by a central straight section 12.
At each end of the straight section 12 is a radio opaque marker 13.
Nylon threads 14 are attached to the lower end of the stent.
The stent is manufactured from PTFE (e.g. Percuflex) and is self-supporting with the configuration shown in Figure 1.
The stent shown in Figure 1 can be inserted into the ureter and in use this embodiment of stent will be positioned in the upper or middle third of the ureter.
In use, the larger diameter portions of the stent maintain the ureter with a given width.
The spiral coils 10 and 11 apply fight pressure against the walls or the ureter and the stent is thus maintained in position, at the desired location, by frict πal forces.
The stent can be inserted in a conventional manner, for example over a conventional 0.038 inch diameter guide wire, using a conventional pusher. The radio opaque markers 13 enable the location of the stent within the body to be tracked with conventional equipment
The nylon threads 14 facilitate extraction of the stent, for example using a flexible cystoscope.
The embodiment of stent shown in Figure 2 has a single spiral coil 10 attached to a central region 12. Radio opaque markers 13 are again present. At the lower end of the stent shown in Figure 2 there is a bladder segment 15 to which is attached nylon threads 14.
The embodiment of stent shown in Figure 2 is designed for use in the lower third of the ureter. The bladder segment 15 comprises a pigtail shape as used on conventional ureteric stents. The retention effect of the spiral coils is only exhibited within the ureter, where the light pressure can be applied against the wall of the ureter. With the embodiment of the invention shown in Figure 2, the lower end of the stent is to lie within the bladder so there is no advantage in using a spiral coil. It is sufficient to use the conventional pigtail which resists movement of the lower end of the stent out of the bladder.
Each spiral coil has a length of 1cm and a maximum diameter of 1cm.
Each central region 12 has a length of from 3 to 6 cms.
Conventional stents always protrude into the bladder from the lower end and into the kidney from the upper end. This can cause irritation and infection. They can also cause backflow of urine with attendant problems.
The stents according to the invention occupy only the obstructed segment of the ureter and this reduces the risk of irritation and side effects.
Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive, Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiments). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims

1. A ureteric stent having a length which is less than half that of the ureter.
2. A stent as claimed in claim 1, having a length substantially equal to one third of the length of the ureter.
3. A stent as claimed in claim 1 or claim 2, having means to retain the stent in a predetermined position within the ureter.
4. A stent as claimed in claim 3, in which the means to retain the stent in position comprises a portion of the stent which exerts sideways pressure on the wall of the ureter, so that the stent is maintained in position by frictional forces.
5. A stent as claimed in claim 4, in which said portion of the stent comprises a spiral coil.
6. A stent as claimed in claim 5, in which the spiral coil is arranged at one end of the stent.
7. A stent as claimed in claim 5 or claim 6, for use in the upper or middle third of the ureter, having a spiral coil at each end.
8. A stent as claimed in any of claims 5 to 7, having a coil having a maximum diameter of from 1cm to 2cm and a length of from 1cm to 2cm.
9. A stent as claimed in claim 8, having a diameter of 6 French and a length of 1cm.
10. A stent as claimed in any of the preceding claims, having a substantially straight central region.
11. A stent as claimed in claim 10, in which the central region has a length of from 3 to 6cms.
12. A stent as claimed in any of the preceding claims, having one or more threads attached thereto. 3. A stent as claimed in claim 12, in which the threads are of nylon.
14. A stent as claimed in claim 10 or claim 1 , in which each end of the central region is provided with a radio-opaque marker.
15. A stent as claimed in any of the preceding claims, manufactured from PTFE or other biocompatible polymer material.
PCT/GB2005/001461 2004-04-23 2005-04-15 Ureteric stent WO2005102217A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0409031A GB0409031D0 (en) 2004-04-23 2004-04-23 Stents
GB0409031.2 2004-04-23

Publications (1)

Publication Number Publication Date
WO2005102217A1 true WO2005102217A1 (en) 2005-11-03

Family

ID=32344244

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/001461 WO2005102217A1 (en) 2004-04-23 2005-04-15 Ureteric stent

Country Status (2)

Country Link
GB (1) GB0409031D0 (en)
WO (1) WO2005102217A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8007702B2 (en) 2002-10-30 2011-08-30 Boston Scientific Scimed, Inc. Methods of manufacturing linearly expandable ureteral stents
ES2472122A1 (en) * 2012-12-27 2014-06-27 Fundaci�N Centro De Cirug�A M�Nima Invasi�N Jes�S Us�N Self-retentive and anti-reflux ureteral catheter
US20150142127A1 (en) * 2012-06-08 2015-05-21 University Hospitals Health System, Inc. Ureteral stent for placement in a kidney and bladder
US9254203B2 (en) 2012-08-20 2016-02-09 Boston Scientific Scimed, Inc. Delivery device
CN109875733A (en) * 2017-12-01 2019-06-14 捷锐士阿希迈公司(以奥林巴斯美国外科技术名义) Ureter bracket
CN113081419A (en) * 2021-03-01 2021-07-09 东华大学 Developable recyclable self-expanding ureteral stent and preparation method thereof
US11154391B2 (en) 2016-05-06 2021-10-26 University Hospitals Health Systems, Inc. Ureteral stent for placement in a kidney and bladder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661603A1 (en) * 1990-05-02 1991-11-08 Coralines Abj Division Sarl Prosthesis for treating stenoses in the channels of the body
US5261916A (en) * 1991-12-12 1993-11-16 Target Therapeutics Detachable pusher-vasoocclusive coil assembly with interlocking ball and keyway coupling
WO2000066032A1 (en) * 1999-04-30 2000-11-09 Applied Medical Resources Corporation Improved ureteral stent system apparatus and method
US6332892B1 (en) * 1999-03-02 2001-12-25 Scimed Life Systems, Inc. Medical device with one or more helical coils
US20030109930A1 (en) * 2001-12-11 2003-06-12 Scott Bluni Ureteral stents and related methods
US6656146B1 (en) * 1995-11-07 2003-12-02 Scimed Life Systems, Inc. Medical device with tail(s)

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661603A1 (en) * 1990-05-02 1991-11-08 Coralines Abj Division Sarl Prosthesis for treating stenoses in the channels of the body
US5261916A (en) * 1991-12-12 1993-11-16 Target Therapeutics Detachable pusher-vasoocclusive coil assembly with interlocking ball and keyway coupling
US6656146B1 (en) * 1995-11-07 2003-12-02 Scimed Life Systems, Inc. Medical device with tail(s)
US6332892B1 (en) * 1999-03-02 2001-12-25 Scimed Life Systems, Inc. Medical device with one or more helical coils
WO2000066032A1 (en) * 1999-04-30 2000-11-09 Applied Medical Resources Corporation Improved ureteral stent system apparatus and method
US20030109930A1 (en) * 2001-12-11 2003-06-12 Scott Bluni Ureteral stents and related methods

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9060888B2 (en) 2002-10-30 2015-06-23 Boston Scientific Scimed, Inc. Method of disposing a linearly expandable ureteral stent within a patient
US8241548B2 (en) 2002-10-30 2012-08-14 Boston Scientific Scimed, Inc. Methods of manufacturing linearly expandable ureteral stents
US8568643B2 (en) 2002-10-30 2013-10-29 Boston Scientific Scimed, Inc. Methods of manufacturing linearly expandable ureteral stents
US10201441B2 (en) 2002-10-30 2019-02-12 Boston Scientific Scimed, Inc. Linearly expandable ureteral stent
US8007702B2 (en) 2002-10-30 2011-08-30 Boston Scientific Scimed, Inc. Methods of manufacturing linearly expandable ureteral stents
US20150142127A1 (en) * 2012-06-08 2015-05-21 University Hospitals Health System, Inc. Ureteral stent for placement in a kidney and bladder
US9750621B2 (en) * 2012-06-08 2017-09-05 University Hospitals Cleveland Medical Center Ureteral stent for placement in a kidney and bladder
US11278436B2 (en) 2012-06-08 2022-03-22 University Hospitals Health System, Inc. Ureteral stent for placement in a kidney and bladder
US9254203B2 (en) 2012-08-20 2016-02-09 Boston Scientific Scimed, Inc. Delivery device
ES2472122A1 (en) * 2012-12-27 2014-06-27 Fundaci�N Centro De Cirug�A M�Nima Invasi�N Jes�S Us�N Self-retentive and anti-reflux ureteral catheter
US11154391B2 (en) 2016-05-06 2021-10-26 University Hospitals Health Systems, Inc. Ureteral stent for placement in a kidney and bladder
CN109875733A (en) * 2017-12-01 2019-06-14 捷锐士阿希迈公司(以奥林巴斯美国外科技术名义) Ureter bracket
US10933227B2 (en) 2017-12-01 2021-03-02 Gyrus Acmi, Inc. Ureteral stent
US11779737B2 (en) 2017-12-01 2023-10-10 Gyrus Acmi, Inc. Ureteral stent
CN113081419A (en) * 2021-03-01 2021-07-09 东华大学 Developable recyclable self-expanding ureteral stent and preparation method thereof
CN113081419B (en) * 2021-03-01 2022-04-29 东华大学 Developable recyclable self-expanding ureteral stent and preparation method thereof

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