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Stent with soluble bladder retention member

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Stent with soluble bladder retention member


Ureteral stents having at least a portion of a proximal end of the ureteral stent constructed with a material that dissolves after being exposed to a bodily fluid for a period of time are disclosed herein. At least a portion of the proximal end portion of the elongate member includes a dissolving portion configured to dissolve in response to being exposed to a bodily fluid for a period of time. The elongate member also includes a non-dissolving portion that includes the entire retention member of the distal end portion and is substantially stable in the bodily fluid of the urinary tract of the patient. In some embodiments, a medial portion of the ureteral stent is also constructed with one or more dissolving materials. In some implementations, the proximal and/or the medial portions of the ureteral stent are constructed using various combinations of dissolving and non-dissolving materials.
Related Terms: Urinary Tract

Browse recent Boston Scientific Scimed, Inc. patents - Maple Grove, MN, US
Inventor: Raymond G. AMOS, JR.
USPTO Applicaton #: #20120303134 - Class: 623 2366 (USPTO) - 11/29/12 - Class 623 
Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor > Implantable Prosthesis >Hollow Or Tubular Part Or Organ (e.g., Bladder, Urethra, Bronchi, Bile Duct, Etc.) >Urethra

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The Patent Description & Claims data below is from USPTO Patent Application 20120303134, Stent with soluble bladder retention member.

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CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 12/731,836, filed Mar. 25, 2010, entitled “STENT WITH SOLUBLE BLADDER RETENTION MEMBER,” which, in turn, is a continuation of U.S. patent application Ser. No. 11/855,274, filed Sep. 14, 2007, entitled “STENT WITH SOLUBLE BLADDER RETENTION MEMBER,” which, in turn, claims priority to U.S. Patent Application Ser. No. 60/826,642, filed Sep. 22, 2006, entitled “STENT WITH SOLUBLE BLADDER RETENTION MEMBER”, all of which are incorporated by reference herein in their entirety.

BACKGROUND

The disclosed invention relates generally to a medical device, and in particular, to a ureteral stent with a dissolving portion.

Known ureteral stents are typically placed within a urinary tract of a patient such that one end portion of the ureteral stent is located in a kidney of the patient and another end portion of the ureteral stent is located in either a bladder or a ureter of the patient. Known ureteral stents are typically positioned within the urinary tract of the patient by placing a guidewire within the patient, sliding the ureteral stent on the guidewire, and then forcing the ureteral stent along the guidewire into a desired position within the patient using a push rod. Such ureteral stents are often removed from the patient by pulling the ureteral stent from the urinary tract of the patient.

Some known ureteral stents include a retention member at a kidney end portion of the ureteral stent and a retention member at a bladder end portion of the ureteral stent. The retention member of the bladder end portion of the ureteral stent is configured to be placed within the bladder to help prevent migration of the ureteral stent upwardly toward the kidney. Similarly, the retention member of the kidney end portion is configured to be placed within the kidney to help prevent migration of the ureteral stent downwardly toward the bladder.

Known ureteral stents often cause pain and discomfort to the patient once the ureteral stents are positioned within the body. In particular, the retention member of the bladder end portion can irritate sensitive regions in the bladder such as the trigone region and/or intramural tunnel. Thus, a need exists for a ureteral stent that substantially reduces and/or minimizes irritation of sensitive regions of a urinary tract of a patient.

SUMMARY

A ureteral stent includes an elongate member that is configured to be disposed within a urinary tract of a patient to convey urine from a first portion of the urinary tract of the patient to a second portion of the urinary tract of the patient. The elongate member has a distal end portion, a proximal end portion, and a medial portion disposed between the distal end portion and the proximal end portion. The distal end portion includes a retention member configured to help retain at least a portion of the elongate member within a kidney of the patient and the proximal end portion includes a retention member configured to help retain at least a portion of the elongate member within a bladder of the patient.

In some embodiments, the proximal end portion of the elongate member includes a dissolving portion configured to dissolve in response to being exposed to a bodily fluid for a period of time. The elongate member also has a non-dissolving portion that includes the entire retention member of the distal end portion and is substantially stable in the bodily fluid of the urinary tract of the patient.

In another embodiment, the retention member of the distal end portion is constructed of a stent material that is substantially stable in the bodily fluid of the urinary tract of the patient. The proximal end portion includes a dissolving portion that is configured to dissolve in response to being exposed to a bodily fluid for a period of time and a non-dissolving portion that is substantially stable in the bodily fluid of the urinary tract of the patient.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is described with reference to the accompanying drawings. In the drawings, identical or like reference numbers indicate identical or functionally similar elements.

FIG. 1 is a schematic diagram that illustrates a ureteral stent, according to an embodiment of the invention, disposed within a urinary tract of a patient.

FIG. 2 is a schematic diagram of a side view of a ureteral stent, according to an embodiment of the invention, disposed within a urinary tract of a patient.

FIG. 3A is a schematic diagram of a side cross-sectional view of a ureteral stent, according to an embodiment of the invention, before a dissolving portion dissolves.

FIG. 3B is a schematic diagram of a side cross-sectional view of the ureteral stent of FIG. 3A after the dissolving portion has dissolved.

FIG. 4 is a schematic diagram of a side view of a ureteral stent, according to an embodiment of the invention.

FIG. 5A is a schematic diagram of a side cross-sectional view of a ureteral stent, according to an embodiment of the invention, before a dissolving material dissolves.

FIG. 5B is a schematic diagram of a side cross-sectional view of the ureteral stent of FIG. 5A after the dissolving material has dissolved.

FIG. 6 is a schematic diagram of a side view of a proximal end portion and a medial portion of a ureteral stent, according to an embodiment of the invention.

FIG. 7 is a schematic diagram of a side view of a ureteral stent, according to an embodiment of the invention.



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Previous Patent Application:
Porous ureteral stent
Next Patent Application:
Stent for bile duct
Industry Class:
Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor
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stats Patent Info
Application #
US 20120303134 A1
Publish Date
11/29/2012
Document #
13559229
File Date
07/26/2012
USPTO Class
623 2366
Other USPTO Classes
International Class
61F2/04
Drawings
8


Urinary Tract


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