Ureteral Stent

This is a landscape report on the Ureteral stent market, including key company profiles, products, patents and relevant clinical trails.

• What is it? A ureteral stent is a specially designed hollow tube, made of a flexible plastic material that is placed in the ureter.

• Need for a ureteral stent: In patients who have, or might have, an obstruction (blockage) of the kidney, an internal drainage tube called a ‘stent’ is commonly placed in the ureter, the tube between the kidney and the bladder. This is placed there in order to prevent or temporarily relieve the obstruction.

Background

Ureteric Stent

Ureteral stents are used in urological surgery to maintain patency of the ureter to allow urine drainage from the renal pelvis to the bladder. These devices can be placed by a number of different endourological techniques. They are typically inserted through a cystoscope and may also be inserted intraoperatively. Indwelling ureteral stents help to reduce complications and morbidity subsequent to urological and surgical procedures. Frequently, ureteral stents are used to facilitate drainage in conjunction with Extracorporeal Shock Wave Lithotripsy (ESWL) and after endoscopic procedures. They are also used to internally support anastomoses and prevent urine leakage after surgery. Ureteral stenting may almost eliminate the urological complications of renal transplantation. An antimicrobial ureteral stent, which inhibits encrustation and bacterial colonization while maintaining patient comfort.

• Ureteral stent: resists migration, resists fragmentation, is kink resistant and radiopaque.
• Bacterial colonization: antimicrobial activity for up to two weeks.
• Patient Comfort: stent has a low coefficient of friction (value) for ease of insertion and will soften on implant at body temperature to maintain patient comfort.

more on background...

Market Overview

Market for ureteral stent can be analyzed by estimating market for each of Ureteral Stent’s fundamental use. Other uses of Ureteral Stent include Post-surgical swelling/infection of uterus, Active kidney infection etc.

more on market overview...

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Patents

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Clinical Trials

New trials

S.No.	Title	Conditions	Intervention: Device	Sponsors and Collaborators
1	Assessment of Drug-Eluting Ureteral Stent on Bacterial Adherence and Biofilm Formation	Renal Calculi, Ureteral Obstruction	Ureteral Stent	Lawson Health Research Institute, Boston Scientific Corporation
2	Memokath® 044TW Stent for Treatment of Urethral Stricture	Urethral Stricture	Memokath stenting	Engineers & Doctors Wallsten Medical Group
3	Study to Determine if There Are Specific Clinical Factors to Determine Stent Encrustation	Kidney Stones	N\A	University of California, Irvine
4	Ureteral Stent Length and Patient Symptoms	Kidney Stones	Ureteral Stent	Emory University
5	Drainage of Malignant Extrinsic Ureteral Obstruction Using the Memokath Ureteral Stent	Ureteral Obstruction	Memokath 051 Ureteral Stent	Mayo Clinic Engineers & Doctors Wallsten Medical Group
6	A Prospective Comparison Between Ureteral Stent and Nephrostomy Tube for an Urgent Drainage of Obstructed Kidney (JJVsPCN08)	Kidney Disease	Nephrostomy tube and ureteral stent	Rabin Medical Center

Concluded trials

S.No.	Title	Abstract	Enrollment	Disorder	Conclusion
1	Long-term outcome of permanent urethral stents in the treatment of detrusor-sphincter dyssynergia	To evaluate the long-term efficacy of a permanently implanted urethral stent in the treatment of spinally injured patients with detrusor-sphincter dyssynergia.	13	Detrusor-sphincter dyssynergia	Stenting is an effective alternative to sphincterotomy in the long-term, although secondary bladder neck obstruction is a frequent problem.
2	Nephrostomy Tube or 'JJ' Ureteric Stent in Ureteric Obstruction: Assessment of Patient Perspectives Using Quality-of-Life Survey and Utility Analysis	Upper urinary tract obstruction is often relieved by either a percutaneous nephrostomy tube (PCN) or a ureteric stent. Both can cause considerable morbidity and reduce patient's health-related quality of life (QoL). We have compared the QoL in these 2 groups.	34	Upper urinary tract obstruction	Patients with 'JJ' stents have significantly more irritative urinary symptoms and a high chance of local discomfort than patients with nephrostomy tubes (PCN). However, based on the EuroQol analysis, there is no significant difference in the gross impact on the health-related QoL or the utility between these groups indicating no patient preference for either modality of treatment.
3	Impact of stents on urological complications and health care expenditure in renal transplant recipients: results of a prospective, randomized clinical trial.	A randomized, prospective trial to compare the incidence of early urological complications and health care expenditures in renal transplant recipients with or without ureteral stenting.	201	Renal transplant recipient	Using a ureteral stent at renal transplantation significantly decreases the early urinary complications of urine leakage and obstruction. However, there is a significant increase in urinary tract infections, primarily beyond 30 days after transplantation. Stent removal within 4 weeks of insertion appears advisable.

Pre-Market Notification

Some of the companies active in the field of ureteral stents have been represented in the table below.

S.No.	Company	Device	Approval	Date of Approval	Material	Technology	Indwelling Time (days)
1	Bard Urological	InLay Optima	FDA 510(k)	Dec 2004	Silicone	Double pigtail with monofilament suture loop	365
2	Boston Scientific	Polaris Loop	FDA 510(k)	Mar 2003	Dual Durometer Percuflex with HydroPlus Coating	Bladder loop design	365
3	Cook Medical	Resonance	FDA 510(k)	May 2007	Metal	Temporary stenting	365
4	Fossa Medical	Stone Sweeper	FDA 510(k)	Aug 2002	Polyurethane	Spiral radially expanding stent	13
			CE Mark	Sep 2005
5	Pnn Medical A/S	Memokath 051	CE Mark	1995	Nickel-titanium shape memory alloy	Double fluted ended spiral stent	240

Products

The FDA classifies a ureteric stent as follows:

• TITLE 21 - FOOD AND DRUGS
• CHAPTER I - FOOD AND DRUG ADMINISTRATION DEPARTMENT OF HEALTH AND HUMAN SERVICES
• SUBCHAPTER H - MEDICAL DEVICES
• PART 876 - GASTROENTEROLOGY-UROLOGY DEVICES
• Subpart E - Surgical Devices
• Sec. 876.4620 - Ureteral stent.
• Classification - class II device Code of Federal Regulations

Sr. No.	Company	Device(s)	Approval	Approval Date	Material	Technology	Indwelling Time (days)	Image
1	Allium, Israel	URS	CE Mark	Jul, 2007	Nickel-titanium shape memory alloy covered by polymer	Self-expanding stent		Allium
2	Pnn Medical A/S	Memokath 051	CE Mark	1995	Nickel-titanium shape memory alloy	Double fluted ended spiral stent	240	Memokath 051
			FDA Listing	Mar, 2004
3	Fossa Medical	Stone Sweeper	CE Mark	Sep, 2005	Polyurethane	Radially expanding stent	13	Stone Sweeper
			FDA 510(k)	Aug, 2002
		Open lumen stent	FDA 510(k)	Nov, 2003	Polyurethane	Pigtail-tipped stent with ’Pusher’		Open_lumen
			CE Mark	Sep, 2005
		Expanding Ureteral Stent	FDA 510(k)	Jun, 2002	Polyurethane	Double pigtail stent with ’Pusher’		N/A
4	Boston Scientific	Contour			Percuflex - proprietary polyolefin copolymer; Hydroplus coating	Fixed and variable length; Tapered tip	365	Contour
		Percuflex			Percuflex	Pigtail	365	Percuflex
		Polaris Ultra	FDA 510(k)	Jan, 2001	Dual Durometer Percuflex with HydroPlus Coating; soft Nautilus Bladder Coil.	Double pigtail	365	Polaris Ultra
		Polaris Loop	FDA 510(k)	Mar, 2003	Dual Durometer Percuflex with HydroPlus Coating	Bladder loop design	365	Polaris Loop
		Retromax Plus			Percuflex material and Hydroplus coating	Endopyelotomy stent	Post-procedure healing	Retromax Plus
		Stretch VL Flexima			Hydroplus Coating	Variable length coil on distal and proximal ends	90	Stretch VL Flexima
		Drug-Eluting Stent			Percuflex - proprietary polyolefin copolymer	Ketorolac trimethamine loaded stent		N/A
5	Cook Medical	Resonance	FDA 510(k)	May, 2007	Metal		365	Resonance
		Sof-flex			AQ® Hydrophilic Coating	Radiopaque tip and tether for repositioning	180	Sof-flex
		Endo-Sof			AQ® Hydrophilic Coating	Double pigtail	365	Endo-Sof
		C-Flex				Double Pigtail	180	C-Flex
		Smith Universal				Nephrostomy tube + Ureteral stent	60	Smith Universal
		Endo-Sof Radiance	Launch	Dec, 2007	Heparin-bonded stent
6	Q Urological	pAguaMedicina™ Pediatric Ureteral Stent	FDA 510(k)	Jan, 2010	Hydrogel	Differentially larger end (no pigtail)	30	pAguaMedicina
7	Bioteque Corp.	Ureteral Stent Set	FDA 510(k)	Apr, 2010			30	Bioteque
8	Applied Medical Resources, CA, USA	Mesh	FDA 510(k)	Jul, 2001	Polyester mesh	Double-pigtail		N/A
		Silhouette			Coil-reinforced; SL-6® hydrophilic coating	Patency Device		Silhouette
		Applied Standard	FDA 510(k)	Jun, 1999	Proprietary thermoplastic elastomer material; SL-6® hydrophilic coating	Unique wall construction and enlarged drainage holes		Applied Standard
		7-10 endopyelotomy			Proprietary thermoplastic elastomer material; SL-6® hydrophilic coating	Dual Diameter stent		Endopyelotomy Stent
9	Bard Urological	InLay Optima	FDA 510(k)	Dec, 2004	Silicone	Double pigtail with monofilament suture loop	365	InLay Optima
		Bardex® Double Pigtail Soft Stent	FDA 510(k)	Jan, 2003	Silicone	Attached with suture for ease of removal		Bardex
		Fluoro-4 Silicone Ureteral Stent			Silicone/tantalum			Fluoro 4
		Figure-4 Silicone Ureteral Stent			Silicone	Three dimensional design		Figure 4
		InLay Ureteral Stent	FDA 510(k)	Dec, 1998	Silicone	Tapered tip and lubricious hydrophilic coating		InLay
		Urinary Diversion Stent	FDA 510(k)	Apr, 1991	Silicone			Urinary Diversion Stent
10	Coloplast-Porges	Vortek	FDA 510(k)	Oct, 1998	Silicone	Double coating for easy maneuverability as well as flexibility		Vortek
		Biosoft	FDA 510(k)	Oct, 1998	Silicone	Extreme flexibility		Biosoft
		Polyurethane			Hard or soft Polyurethane	Designed for short-term use	90	Polyurethane
		Silicone	FDA 510k)	Oct, 2002	Silicone	Pyatiprofilnaya technology		Silicone
11	Teleflex Medical	Rüsch Superglide DD	FDA 510(k)	Jul, 1999	WIRUTHAN® (polyurethane) with hydrogel coating	Directable and detachable		Superglide DD
12	Gyrus ACMI/Cabot/Acromed/Circon/Surgitek	Classic closed-tip	FDA 510(k)	Dec, 1986		Classic Closed Tip		Classic Closed Tip
		Classic Double pigtail	FDA 510(k)	Mar, 1996	Tecoflex® construction	Balanced-curled double pigtail design		Double Pigtail
		Double-J	FDA 510(k)	Apr, 1988	Silicone	Double-J closed-tip		Double_J
		Lithostent			Tecoflex®	Grooved design		Lithostent
		Lubri-flex	FDA 510(k)	Nov, 1991	Tecoflex®	“Rememberance” of shape with a chemically bonded wettable solution		Lubri-flex
		Multi-flex			Tecoflex®	Two durometers with helical kidney curls		Multi-flex
		Quadra-Coil multi-length	FDA 510(k)	Mar, 1996	Tecoflex®	Accomodate ureteral lengths from 22cm to 28cm		Quadra-Coil
		Sof-curl			Tecoflex®	Dual-durometer design and exclusive soft bladder helix		Sof-curl
		Uroguide			Silicone	Classic Double J with open tip		Uroguide
13	Ameco Medical Industries	Amecath			Nitinol; Available with hydrophilic coating	Double loop stent	Short-term and long-term	Amecath
14	Angiomed-Movaco (C.R. Bard subsidiary)	Ureteral Stent Set	FDA 510(k)	Jan, 1987	Nitinol	Self-expanding stent		N/A

Product to Clinical Trial Mapping

Clinical Timeline Visualization

Ureteral Stent Timeline

Product to Patent Mapping

Screenshot for the product to patent mapping(Bard and Boston)

• Click Products from Boston Scientific and C R Bard to download the excel file.

Mapped Patent vs Not Mapped Patents

C R Bard

Boston Scientific

Patent-Product-Clinical Trial Mapping

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Insights

		Boston Scientific	C R BARD
Products	Portfolio	8 Products	6 Products
	Material	Percuflex - Biocompatible Polymer	Silicone
	Coating	Hydroplus	Licensed from pHreecoat
	Shape	Pigtailed and More	Figure 4 and more
Clinical Trials	Current Trials	Truimph Ureteral stent - Loaded with Triclosan Currently in Phase II (Canada)	None
Patents	Coating	Therapeutic / Medicinal coatings Magnetic nano particles for MRI Imaging Lubricious coatings helping easy insertion	Therapeutic coatings
	Structure	Multiple channels filled with therapeutic agent Multiple collapsible segments preventing fluid passing Renal coil with wick to prevent reflux Stent with beads on its surface Stent with reservoir indicating its release with change in color of urine Expandable and collapsible stent Stents with degradable barbs	Expandable stents for reducing discomfort
	Material	Elastically deformable stents Biodegradable polymer based stents Porous polymer for long term implantation Stent with variable hardness	Biodegradable polymers Shape memory alloys General polymer based

Inference

Boston Scientific	C R BARD
Relatively late entrant with patents filed post mid 90s	Early mover with patents filed in mid 80s
Increased patent activity since 2000	Patent activity never gained traction
Large number of patents yet to be "productized"	Few patents yet to be "productized"
Some products undergoing clinical trails	No products undergoing clinical trails
Diverse range of products with variation in material and structure	Small product portfolio
Seem to be strengthening they market position	Seem to be moving focus away from Ureteral stents market

Competitive Landscape

Major Players

• Boston Scientific Limited, Abbott, Medtronic and Cook Inc. are the major players in ureteral stent research field.

Major Players

IP Activity

• Patenting activity has been high growth rate during the period 2001 to 2005 with a peak no. of patents in year 2005, followed by saturation during the period 2006 to 2008 and after that a gradual declination upto year 2010 in the ureteral stent research area.

IP activity over the years

Sales

Total Sales in 2010 - 4.04 Billion USD

Company	Total Sales in 2010	Urological sales	Percentage share	Product portfolio
Boston Scientific	7800	661	8.48	Boston_portfolio
CR BARD	2700	702	26.00	BARD_portfolio
Cook Medical	1700	-	-	Cook_portfolio
Medline	4040	-	-	Medline_portfolio

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