Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS20040087886 A1
Publication typeApplication
Application numberUS 10/283,873
Publication dateMay 6, 2004
Filing dateOct 30, 2002
Priority dateOct 30, 2002
Also published asCA2504150A1, EP1556115A1, EP1556115B1, US8007702, US8241548, US8568643, US9060888, US20090030363, US20100072659, US20100076574, US20110290404, US20120285607, WO2004041345A1
Publication number10283873, 283873, US 2004/0087886 A1, US 2004/087886 A1, US 20040087886 A1, US 20040087886A1, US 2004087886 A1, US 2004087886A1, US-A1-20040087886, US-A1-2004087886, US2004/0087886A1, US2004/087886A1, US20040087886 A1, US20040087886A1, US2004087886 A1, US2004087886A1
InventorsBarry Gellman
Original AssigneeScimed Life Systems, Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Linearly expandable ureteral stent
US 20040087886 A1
Abstract
A ureteral stent including an elongated member defining a lumen, the member having a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen. A distal retention structure is connected to a distal end of the elongated member for retention in a kidney. A proximal retention structure is connected to a proximal end of the elongated member for retention in a bladder.
Images(8)
Previous page
Next page
Claims(38)
What is claimed is:
1. A ureteral stent comprising:
an elongated member defining a lumen, the member having a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen;
a distal retention structure connected to a distal end of the elongated member for retention in a kidney; and
a proximal retention structure connected to a proximal end of the elongated member for retention in a bladder.
2. The stent of claim 1 wherein the member comprises a spring having a spring force of less than one pound.
3. The stent of claim 2 wherein the member comprises a wire spring.
4. The stent of claim 3 wherein the wire spring comprises a metal alloy.
5. The stent of claim 4 wherein the metal alloy comprises at least one of titanium, nickel, copper, cobalt, vanadium, and iron.
6. The stent of claim 5 wherein the metal alloy comprises nitonol.
7. The stent of claim 6 wherein nitonol comprises nickel and titanium.
8. The stent of claim 7 wherein nitonol comprises about 50% to about 52% nickel.
9. The stent of claim 8 wherein nitonol comprises about 48% to about 50% titanium.
10. The stent of claim 3 wherein the wire spring is coated with a polymer.
11. The stent of claim 10 wherein the polymer comprises at least one of urethane, nylon, thermoplastic polyurethane (TPU), thermoplastic polyester elastomer, polyethyl, and silicone.
12. The stent of claim 1 wherein the elongated member comprises a tube having the solid sidewall and defining the lumen, and the spiral-shaped opening is defined by a slit formed in the sidewall of the tube.
13. The stent of claim 12 wherein the elongated member comprises a polymer.
14. The stent of claim 13 wherein the polymer comprises at least one of urethane, nylon, thermoplastic polyurethane (TPU), thermoplastic polyester elastomer, polyethyl, and silicone.
15. The stent of claim 1 wherein the elongated member comprises an inner liner and an outer cover.
16. The stent of claim 15, further comprising:
a wire spring sandwiched between the inner liner and the outer cover,
wherein the spiral-shaped opening is defined by slits formed in the inner liner and the outer cover, between a plurality of coils of the wire spring.
17. The stent of claim 16 wherein the wire spring comprises a metal alloy.
18. The stent of claim 17 wherein the metal alloy comprises at least one of titanium, nickel, copper, cobalt, vanadium, and iron.
19. The stent of claim 17 wherein the metal alloy comprises nitonol.
20. The stent of claim 19 wherein nitonol comprises nickel and titanium.
21. The stent of claim 15 wherein at least one of the inner liner and the outer cover comprises a polymer.
22. The stent of claim 21 wherein the polymer comprises at least one of urethane, nylon, thermoplastic polyurethane (TPU), thermoplastic polyester elastomer, polyethyl, and silicone.
23. The stent of claim 1, further comprising:
a removable introducer sized for placement within the lumen.
24. A ureteral stent comprising:
an elongated member defining a lumen, the member having a solid sidewall with at least one slit formed therein such that the member is linearly expandable along a longitudinal axis of the lumen;
a distal retention structure connected to a distal end of the elongated member for retention in a kidney; and
a proximal retention structure connected to a proximal end of the elongated member for retention in a bladder.
25. A method of facilitating urinary drainage from a kidney to a bladder in a patient that reduces discomfort to the patient, comprising:
positioning a ureteral stent in a ureter of a patient, the ureteral stent having an elongated member defining a lumen, the member having a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen, a distal retention structure connected to a distal end of the elongated member for retention in the kidney, and a proximal retention structure connected to a proximal end of the elongated member for retention in the bladder; and
allowing the elongated member to linearly expand and contract between an expanded position and a retracted position, based on at least one of: relative positioning of organs within the patient, a breathing pattern of the patient, and relative positions of the kidney and the bladder.
26. The method of claim 25 wherein the organs comprise the kidney and the bladder.
27. The method of claim 25 wherein the organs are the kidney and the bladder.
28. The method of claim 25 wherein the allowing step comprises providing the elongated member biased to the retracted position.
29. A method of manufacturing a linearly expandable ureteral stent, comprising the steps of:
providing an elongated member defining a lumen, the member having a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen, a distal retention structure, and a proximal retention structure;
connecting the distal retention structure to a distal end of the elongated member; and
connecting the proximal retention structure to a proximal end of the elongated member.
30. The method of claim 29 wherein providing the elongated member comprises providing a wire spring.
31. The method of claim 30 wherein providing the wire spring comprises coating the wire spring with a polymer.
32. The method of claim 30 wherein providing the wire spring comprises sandwiching the wire spring between an inner lining and an outer cover.
33. The method of claim 32 wherein the inner lining and outer cover comprise extruded sheets.
34. The method of claim 32, further comprising;
shrinking the inner lining and outer cover; and
forming slits through the inner lining and outer cover between a plurality of coils of the wire spring.
35. The method of claim 32, further comprising:
melting the inner lining and the outer cover; and
forming slits through the inner lining and outer cover between a plurality of coils of the wire spring.
36. The method of claim 29 wherein providing the elongated member comprises forming a tube comprising a polymer and forming a spiral slit through the tube.
37. A method of placing a ureteral stent in a patient, the method comprising:
providing a ureteral stent comprising:
an elongated member defining a lumen, the member having a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen;
a distal retention structure connected to a distal end of the elongated member; and
a proximal retention structure connected to a proximal end of the elongated member;
inserting the ureteral stent into a ureter of the patient; and
positioning the ureteral stent in the patient with the distal retention structure substantially within the kidney of the patient, the elongated member substantially within the intramural tunnel portion of the ureter, and the proximal retention structure substantially within the bladder of the patient.
38. The method of claim 37 wherein the ureteral stent further comprises a removable introducer sized to fit within the lumen and inserting the ureteral stent includes inserting the stent with the removable introducer into the ureter.
Description
    FIELD OF THE INVENTION
  • [0001]
    The invention generally relates generally to medical devices for the drainage of fluids, and more specifically to ureteral stents.
  • BACKGROUND OF THE INVENTION
  • [0002]
    A ureter is a tubular passageway in a human body that conveys urine from a kidney to a bladder. The ureter begins with the renal pelvis and ends at the trigone region of the bladder, i.e., the triangulated area between both ureteral orifices and the bladder neck. Urine is transported through the ureter under the influence of hydrostatic pressure, assisted by contractions of muscles located within the walls (lining) of the ureter. Some patients experience a urological condition known as ureteral blockage or obstruction. Some common causes of ureteral blockage are the formation of tumors or abnormalities within the ureteral lining, or the formation and passage of kidney stones.
  • [0003]
    Ureteral stents are used to facilitate urinary drainage from the kidneys to the bladder in patients having a ureteral obstruction or injury, or to protect the integrity of the ureter in a variety of surgical manipulations. Stents may be used to treat or avoid ureter obstructions (such as ureteral stones or ureteral tumors) which disrupt the flow of urine from the kidneys to the bladder. Serious obstructions may cause urine to back up into the kidneys, threatening renal function. Ureteral stents may also be used after endoscopic inspection of the ureter.
  • [0004]
    A stent may be uncomfortable to a patient because of intramural tunnel pain, imposed by the stent itself or in combination with intraoperative trauma inflicted from device passage. Pain may also be caused by urine reflux back up the ureter during increased bladder pressure, e.g., during voiding. Further, pain may stem from trigome irritation resulting from constant irritation, imposed by the bladder anchoring features or in combination with intraoperative trauma inflicted from device passage. Moreover, discomfort may arise from flank pain, caused by reflux or kidney anchoring.
  • [0005]
    Ureteral stents typically are tubular in shape, terminating in two opposing ends: a kidney distal end and a bladder proximal end. Existing ureteral stents compensate for the motion between the kidney and bladder by employing a pair of coil end-effectors, with one effector placed in the bladder proximal end and the other in the kidney distal end. As motion occurs, the ureter slides up and down the stent body. Any other travel results in an uncurling of the end effector(s).
  • SUMMARY OF THE INVENTION
  • [0006]
    It is an objective of the invention to provide a patient, male or female, with a flexible device designed to maintain the patency of the ureter and enable fluid drainage while minimizing the pains and discomfort commonly associate with an in-dwelling device.
  • [0007]
    Discomfort may be related to the stent rubbing against a wall of the ureter, caused by the constant relative motion between the kidney and the bladder. This motion may be as much as 5 centimeters (cm) (approximately 2 inches) and cycles with each breath of the patient. This is equal to approximately 17,000 cycles per day, assuming 1 breath every 5 seconds. The present invention alleviates discomfort by providing a stent that, like the ureter, linearly expands and contracts in response to relative motion between the kidney and the bladder, thereby reducing friction caused by a stent rubbing against a wall of the ureter.
  • [0008]
    In one aspect, the invention features a ureteral stent having an elongated member defining a lumen. The member has a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen. A distal retention structure is connected to a distal end of the elongated member for retention in a kidney, and a proximal retention structure is connected to a proximal end of the elongated member for retention in a bladder.
  • [0009]
    One or more of the following features may also be included. The member includes a spring having a spring force of less than one pound. The member includes a wire spring. The wire spring includes a metal alloy, that may include at least one of titanium, nickel, copper, cobalt, vanadium, and iron. The metal alloy includes nitonol. The wire spring is coated with a polymer. The polymer includes at least one of urethane, nylon, thermoplastic polyurethane (TPU), thermoplastic polyester elastomer, polyethyl, and silicone.
  • [0010]
    The stent has an elongated member including a tube having the solid sidewall and defining the lumen. The spiral-shaped opening is defined by a slit formed in the sidewall of the tube. The elongated member may include a polymer, such as at least one of urethane, nylon, TPU, thermoplastic polyester elastomer, polyethyl, and silicone.
  • [0011]
    The elongated member includes an inner liner and an outer cover. A wire spring is sandwiched between the inner liner and the outer cover, with the spiral-shaped opening being defined by slits formed in the inner liner and the outer cover, between a plurality of coils of the wire spring. The wire spring includes a metal alloy including, e.g., at least one of titanium, nickel, copper, cobalt, vanadium, and iron. The metal alloy includes nitonol. At least one of the inner liner and the outer cover includes a polymer. The polymer includes at least one of urethane, nylon, TPU, thermoplastic polyester elastomer, polyethyl, and silicone.
  • [0012]
    A removable introducer is sized for placement within the lumen.
  • [0013]
    In another aspect of the invention, a ureteral stent includes an elongated member defining a lumen, the member having a solid sidewall with at least one slit formed therein such that the member is linearly expandable along a longitudinal axis of the lumen. A distal retention structure is connected to a distal end of the elongated member for retention in a kidney, and a proximal retention structure is connected to a proximal end of the elongated member for retention in a bladder.
  • [0014]
    In yet another aspect of the invention, a method of facilitating urinary drainage from a kidney to a bladder in a patient that reduces discomfort to the patient includes positioning a ureteral stent in a ureter of a patient, the ureteral stent having an elongated member defining a lumen, the member having a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen, a distal retention structure connected to a distal end of the elongated member for retention in the kidney, and a proximal retention structure connected to a proximal end of the elongated member for retention in the bladder. The elongated member is allowed to linearly expand and contract between an expanded position and a retracted position, based on at least one of: relative positioning of organs within the patient, a breathing pattern of the patient, and relative positions of the kidney and the bladder. In addition, the elongated member can be biased to the retracted position.
  • [0015]
    In yet another aspect of the invention, a method of manufacturing a linearly expandable ureteral stent includes providing an elongated member defining a lumen, the member having a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen. The stent also includes a distal retention structure and a proximal retention structure. The distal retention structure is connected to a distal end of the elongated member, and the proximal retention structure is connected to a proximal end of the elongated member.
  • [0016]
    The following features may be included. Providing the elongated member includes providing a wire spring. Providing the wire spring includes coating the wire spring with a polymer. Providing the wire spring includes sandwiching the wire spring between an inner lining and an outer cover. The inner lining and outer cover include extruded sheets. The inner lining and outer cover are shrunk, and slits are formed through the inner lining and outer cover between a plurality of coils of the wire spring. The inner lining and the outer cover are melted, and slits are formed through the inner lining and outer cover between a plurality of coils of the wire spring. The elongated member is provided by forming a tube including a polymer, and forming a spiral slit through the tube.
  • [0017]
    In yet another aspect of the invention, a method of placing a ureteral stent in a patient includes providing a ureteral stent. The ureteral stent includes an elongated member defining a lumen, the member having a solid sidewall defining a spiral-shaped opening such that the member is linearly expandable along a longitudinal axis of the lumen. The ureteral stent also includes a distal retention structure connected to a distal end of the elongated member, and a proximal retention structure connected to a proximal end of the elongated member. The ureteral stent is inserted into a ureter of the patient. The ureteral stent is positioned in the patient with the distal retention structure substantially within the kidney of the patient, the elongated member substantially within the intramural tunnel portion of the ureter, and the proximal retention structure substantially within the bladder of the patient. In a detailed embodiment, the ureteral stent can further include a removable introducer sized to fit within the lumen and inserting the ureteral stent includes inserting the stent with the removable introducer into the ureter.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0018]
    In the drawings, like reference characters generally refer to the same parts throughout the different views. Also, the drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention.
  • [0019]
    [0019]FIG. 1A is a schematic view of a human urinary tract, illustrating the placement of one embodiment of the invention within the ureter of a patient, in an expanded position;
  • [0020]
    FIGS. 1B-1C are detailed sectional views of a portion of the embodiment of the invention of FIG. 1A;
  • [0021]
    FIGS. 2A-2B are schematic representations of the embodiment of the invention illustrated in FIGS. 1A-1C in a retracted position;
  • [0022]
    FIGS. 3A-3B are schematic representations of another embodiment of the invention in an expanded position;
  • [0023]
    FIGS. 4A-4C are schematic representations of the embodiment of the invention illustrated in FIGS. 3A-3B in a retracted position;
  • [0024]
    FIGS. 5A-5C are schematic representations of yet another embodiment of the invention at various stages of fabrication;
  • [0025]
    FIGS. 6A-6C are schematic representations of yet another embodiment of the invention in retracted and expanded positions; and
  • [0026]
    [0026]FIG. 7 is a schematic representation of an introducer.
  • DETAILED DESCRIPTION
  • [0027]
    The invention features temporary ureteral stents that, when positioned within the ureter of a patient, significantly reduce discomfort to the patient. As used herein, proximal refers to the end of a stent closest to a medical professional when placing a stent in a patient. As used herein, distal refers to the end of a stent furthest from a medical professional when placing a stent in a patient.
  • [0028]
    Referring to FIG. 1A, a human urinary tract 100 includes a ureter 105 that transports urine from a kidney 110 to a bladder 115. When ureter 105 becomes blocked or obstructed due to, for example, post-kidney stone fragmentation/removal and ureteral stricture therapy, fluid drainage can become restricted. Ureteral stents are medical devices that are implanted within ureter 105 to restore patency and fluid drainage. A ureteral stent 120 is located within the ureter 105 of a patient, with a distal retention structure 125 in a pelvis 130 of kidney 110, and a proximal retention structure 135 in the bladder 115, proximate ureteral orifice 136. A lumen 137 extends within distal retention structure 25, an elongated member 140, and proximal retention structure 135 to provide for the passage of fluid. Distal retention structure 125 is connected to a distal end 142 of elongated member 120, and proximal retention structure 135 is connected to a proximal end 144 of elongated member 140. Distal retention structure 125 secures distal end 142 of elongated member in or proximate to kidney 110. Proximal retention structure 135 secures proximal end 144 of elongated member 140 in or proximate bladder 115, as well as facilitates the removal of stent 120 by providing a loop suitable for grasping by a hook.
  • [0029]
    Distal retention structure 125 and proximal retention structure 135 can be fabricated of materials such as nylon, polyurethane, or the like. Heat bonding of these materials to elongated member 140 is conveniently accomplished by, for example, using an RF heat source as is commonly employed for plastic tubes and catheters. The desired shape of distal and proximal retention structures 125, 135 can be formed by injection molding or extrusion. They can also be heat-formed, for example, by flaring the working piece over an anvil of an appropriate shape, with the application of heat. The shape of distal retention structure 125 can be, for example, a coil, a pig-tail coil, J-shaped, or a helical coil. The shape of proximal retention structure 135 can be, for example, a coil, a pig-tail coil, J-shaped or a helical coil. In the illustrated embodiment, both distal and proximal retention structures 125, 135 are J-shaped.
  • [0030]
    Referring to FIGS. 1A-1C, elongated member 140 includes a tube 145 having a solid sidewall 150. A slit 155 is formed in sidewall 150, defining a spiral-shaped opening 160, so that elongated member 140 is linearly expandable along a longitudinal axis 165 of lumen 137. Elongated member 140 can be formed from a polymer, such as, e.g., urethane, nylon, TPU, thermoplastic polyester elastomer, polyethyl, and silicone.
  • [0031]
    Elongated member 140 can be manufactured by, for example, injection molding or extrusion and optionally a combination of subsequent machining operations. Extrusion processes, for example, can be used to provide a uniform shape, such as a single monolithic tube. Spiral-shaped opening 160 can be created in the desired locations by a subsequent machining operation.
  • [0032]
    Referring also to FIGS. 2A and 2B, elongated member 140 is linearly expandable between an expanded position (see, e.g., FIGS. 1A-1B) and a retracted position (see FIGS. 2A-2B). When elongated member 140 is retracted, spiral-shaped opening 160 is closed. A difference in an expanded length L1 of elongated member 140 in its expanded position and a retracted length L2 of elongated member 140 in its retracted position can be approximately 5 cm (approximately 2 inches). For example, elongated member 140 can be sized so that retracted length L2 is approximately 8 cm to 30 cm, and expanded length L1 is approximately 13 cm to 35 cm. Elongated member 140 can have, in its retracted position, an outer diameter d1 corresponding to approximately 3.7 French to 14.0 French. Lumen 137 can have a diameter d2 of ______ when elongated member 140 is in its retracted position, to allow the introduction of a guide wire.
  • [0033]
    In use, elongated member 140 can expand linearly up to 2 inches to expanded length L1, to provide comfort to the patient by compensating for at least one of: relative positioning of organs within the patient, a breathing pattern of the patient, and relative positions of kidney 110 and bladder 115. Because of the possibility of linear expansion, a physician may be able to select ureteral stent 120 with a smaller size than would be required with a conventional stent.
  • [0034]
    Referring to FIGS. 3A-3B, in another embodiment, ureteral stent 300 has an elongated member 310 including a spring 315. Distal retention structure 125 is connected to a distal end 312 of elongated member 310, and proximal retention structure 135 is connected to a proximal end 314 of elongated member 310.
  • [0035]
    Spring 315 has a plurality of coils 320 having, in some embodiments, a spring force less than one pound. Spring 315 includes a wire 325 formed from a superelastic material. Materials with superelastic properties make it possible to configure a component into a particular shape, such as a coil or a sleeve, and then modify reversibly the geometry of the component, such as by straightening it out. Once the device is straightened, after removal of the straightening force, the component reverts spontaneously to its predetermined configuration, thereby regaining its former geometry. In so doing, the component provides a biasing force back to its original configuration.
  • [0036]
    Superelastic materials can include alloys of In—Ti, Fe—Mn, Ni—Ti, Ag—Cd, Au—Cd, Au—Cu, Cu—Al—Ni, Cu—Au—Zn, Cu—Zn—Al, Cu—Zn—Sn, Cu—Zn—Xe, Fe3Be, Fe3Pt, Ni—Ti—V, Fe—Ni—Ti—Co, and Cu—Sn. Preferably, wire 325 includes a superelastic material comprising a nickel and titanium alloy, known commonly as nitinol, available from Memory Corp. of Brookfield, Conn. or SMA Inc. of San Jose, Calif. The ratio of nickel and titanium in nitinol can be varied. Examples include a ratio of about 50% to about 52% nickel by weight, or a ratio of about 48% to about 50% titanium by weight. Nitinol has shape retention properties in its superelastic phase.
  • [0037]
    Wire 320 can have a coating 330 including a biocompatible material, such as a polymer like urethane, nylon, TPU, thermoplastic polyester elastomer, polyethyl, or silicone. Coating 330 can be applied to wire 320 by various methods, such as spray coating or painting.
  • [0038]
    Ureteral stent 300 has an expanded position (see, e.g., FIGS. 3A-3B) and a retracted position (see, e.g., FIGS. 4A-4C). In the retracted position, coils 320 abut each other, defining a lumen 332 that is substantially enclosed. In the expanded position, coils 320 define a spiral-shaped opening 335, formed by a plurality of gaps 340 between coils 320. Elongated member 310 is linearly expandable along a longitudinal axis 345 of lumen 332.
  • [0039]
    Referring to FIGS. 5A-5C, in another embodiment, a stent 500 is formed by placing a wire spring 510, having a plurality of coils 512, between an inner lining 515 and an outer cover 520. Wire spring 510 can be made from a metal alloy including, for example, titanium, nickel, copper, cobalt, vanadium, or iron. The metal alloy can include nitonol, a material including nickel and titanium. Inner lining 515 and outer cover 520 can each be formed from an extruded sheet. Inner lining 515 and outer cover 520 can each be made from a polymer, such as urethane, nylon, TPU, thermoplastic polyester elastomer, polyethyl, and silicone.
  • [0040]
    Inner lining 515 and outer cover 520 are deformed at elevated temperatures to fully surround wire spring 510. For example, inner lining 515 and outer cover 520 can be shrunk by, e.g., exposure to a heat lamp. Alternatively, inner lining 515 and outer cover 520 can be melted by, e.g., heating in an oven. After deformation, a plurality of slits 525 are formed through inner lining 515 and outer cover 520 between coils 512 to form an elongated member 530. Elongated member 530 is linearly expandable along a longitudinal axis 535 of a lumen 540 extending through elongated member 530. Elongated member 530 is connected at a distal end 545 to a distal retention structure 125, and at a proximal end 555 to a proximal retention structure 135.
  • [0041]
    Referring to FIGS. 6A-6C, in yet another embodiment, a stent 600 has an elongated member 610 connected to distal retention structure 125 for retention in a kidney and proximal retention structure 135 for retention in a bladder. Elongated member 610 defines a lumen 620, and has a solid sidewall 625. Solid sidewall 625 can be made of a biocompatible material, such as a polymer, e.g., urethane, nylon, TPU, thermoplastic polyester elastomer, polyethyl, or silicone. Solid sidewall 625 has at least one slit 630 formed in it, so that elongated member 610 is linearly expandable along a longitudinal axis 635 of lumen 620.
  • [0042]
    Referring to FIG. 7, in another aspect, the invention provides an apparatus for delivering a stent into a patient. An introducer 700 includes a guide wire 710. A proximal end 720 of guide wire 710 includes a grip 725 to assist in using the device.
  • [0043]
    Referring to FIG. 7 and also to FIG. 1A, in use, a stent, (e.g., stent 120) is mounted on introducer 700. Distal retention structure 125 is threaded over guide wire 710, and most of its inherent curvature is removed. Next, the guide wire 710 is inserted into bladder 115 through ureteral orifice 136 up ureter 105, and into kidney 110. A pusher (not shown) is then moved along guide wire 710, pushing stent 120 along guide wire 710 towards kidney 110. Proximal end 144 of elongated member 140 can be positioned either at or distal to ureteral orifice 136. Stent 120 can also be positioned such that proximal retention structure 135 is at or distal to ureteral orifice 136.
  • [0044]
    Once the surgeon has achieved the desired positioning of stent 120, guide wire 710 is removed, while holding the pusher stationary to maintain stent 120 in position. Finally, the pusher is removed from within the patient, leaving stent 120 in place. Using this method, the stent of the invention can be precisely positioned within ureter 105 of the patient. The method can also be used to accurately position proximal retention structure 135 in bladder 115, and distal retention structure 125 within kidney 110.
  • [0045]
    In one embodiment of the invention, the guide wire, pusher, and stent are inserted into ureter 105 percutaneously through a surgical opening. In another embodiment, they are inserted into the ureter via the urinary tract of the patient.
  • [0046]
    While the invention has been particularly shown and described with reference to specific preferred embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4503569 *Mar 3, 1983Mar 12, 1985Dotter Charles TTransluminally placed expandable graft prosthesis
US4531933 *Dec 7, 1982Jul 30, 1985C. R. Bard, Inc.Helical ureteral stent
US4643716 *May 15, 1986Feb 17, 1987The Kendall CompanyMulti-size ureteral stent
US4671795 *Nov 19, 1984Jun 9, 1987Mulchin William LPermanent/retrievable ureteral catheter
US4681570 *Dec 26, 1985Jul 21, 1987Dalton Michael JPeritoneal catheter
US4813925 *Apr 21, 1987Mar 21, 1989Medical Engineering CorporationSpiral ureteral stent
US5057114 *Sep 18, 1990Oct 15, 1991Cook IncorporatedMedical retrieval basket
US5116309 *May 20, 1991May 26, 1992Coll Milton EUreteral stent-catheter system having varying diameter stent
US5129910 *Jul 26, 1991Jul 14, 1992The Regents Of The University Of CaliforniaStone expulsion stent
US5282860 *Oct 8, 1992Feb 1, 1994Olympus Optical Co., Ltd.Stent tube for medical use
US5514176 *Jan 20, 1995May 7, 1996Vance Products Inc.Pull apart coil stent
US5554189 *Feb 27, 1995Sep 10, 1996De La Torre; Fernando I.Ureteral prosthesis
US5562641 *May 20, 1994Oct 8, 1996A Bromberg & Co. Ltd.Two way shape memory alloy medical stent
US5647843 *May 24, 1996Jul 15, 1997Vance Products IncorporatedAnti-reflux ureteral stent
US5681274 *Mar 31, 1995Oct 28, 1997Boston Scientific CorporationVariable length uretheral stent
US5782916 *Aug 13, 1996Jul 21, 1998Galt Laboratories, Inc.Device for maintaining urinary continence
US5827321 *Feb 7, 1997Oct 27, 1998Cornerstone Devices, Inc.Non-Foreshortening intraluminal prosthesis
US5962007 *Dec 19, 1997Oct 5, 1999Indigo Medical, Inc.Use of a multi-component coil medical construct
US5964744 *Oct 3, 1994Oct 12, 1999Menlo Care, Inc.Polymeric medical device systems having shape memory
US6019779 *Oct 9, 1998Feb 1, 2000Intratherapeutics Inc.Multi-filar coil medical stent
US6027516 *May 4, 1995Feb 22, 2000The United States Of America As Represented By The Department Of Health And Human ServicesHighly elastic, adjustable helical coil stent
US6214042 *Nov 10, 1998Apr 10, 2001Precision Vascular Systems, Inc.Micro-machined stent for vessels, body ducts and the like
US6241691 *Jan 8, 1999Jun 5, 2001Micrus CorporationCoated superelastic stent
US6306105 *May 14, 1998Oct 23, 2001Scimed Life Systems, Inc.High performance coil wire
US6332892 *Mar 2, 1999Dec 25, 2001Scimed Life Systems, Inc.Medical device with one or more helical coils
US6887215 *Dec 6, 2001May 3, 2005Boston Scientific Scimed, Inc.Compressible ureteral stent for comfort
US20020183852 *Dec 6, 2001Dec 5, 2002Mcweeney John O.Compressible ureteral stent for comfort
US20030040803 *Aug 23, 2001Feb 27, 2003Rioux Robert F.Maintaining an open passageway through a body lumen
US20030171708 *Mar 7, 2002Sep 11, 2003Joseph SeguraUreteral stent
US20030176831 *Mar 18, 2002Sep 18, 2003Gellman Barry N.Expandable ureteral stent
US20030181842 *Mar 19, 2002Sep 25, 2003Scimed Life Systems, Inc.Stent retention element and related methods
US20050131547 *Feb 3, 2005Jun 16, 2005Joseph SeguraUreteral stent
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7044981 *Jan 22, 2003May 16, 2006Boston Scientific Scimed, Inc.Ureteral stent configured for improved patient comfort and aftercare
US7470247 *Apr 26, 2004Dec 30, 2008Gyrus Acmi, Inc.Ureteral stent
US7507218Apr 26, 2004Mar 24, 2009Gyrus Acmi, Inc.Stent with flexible elements
US7550012 *Aug 31, 2005Jun 23, 2009Cook Ireland LimitedStent for implantation
US7789915 *May 14, 2007Sep 7, 2010Vance Products IncorporatedStent for implantation
US8632606Sep 26, 2011Jan 21, 2014Olympus Medical Systems Corp.Medical stent
US8961468 *Mar 31, 2014Feb 24, 2015Covidien LpAccess assembly
US9033956Aug 27, 2012May 19, 2015Cook Medical Technologies LlcElectrically charged medical device
US9108017Mar 22, 2012Aug 18, 2015Applied Medical Resources CorporationMethod of making tubing have drainage holes
US9149377Oct 10, 2008Oct 6, 2015Veryan Medical Ltd.Stent suitable for deployment in a blood vessel
US9192403Dec 19, 2013Nov 24, 2015Pneumrx, Inc.Elongated lung volume reduction devices, methods, and systems
US9192493Dec 23, 2013Nov 24, 2015Olympus CorporationMedical stent having a marker coil
US9314353 *Oct 12, 2009Apr 19, 2016Veryan Medical LimitedStent suitable for deployment in a blood vessel
US9381102Mar 30, 2015Jul 5, 2016Cook Medical Technologies LlcElectrically charged medical device
US9402632Apr 24, 2014Aug 2, 2016Pneumrx, Inc.Lung volume reduction devices, methods, and systems
US9402633Mar 13, 2014Aug 2, 2016Pneumrx, Inc.Torque alleviating intra-airway lung volume reduction compressive implant structures
US9402971Jan 23, 2014Aug 2, 2016Pneumrx, Inc.Minimally invasive lung volume reduction devices, methods, and systems
US9474533Mar 26, 2014Oct 25, 2016Pneumrx, Inc.Cross-sectional modification during deployment of an elongate lung volume reduction device
US9498356Dec 13, 2013Nov 22, 2016Cook Medical Technologies, LLCFlexible stent and delivery system
US20040143209 *Jan 22, 2003Jul 22, 2004Liu Clifford M.Ureteral stent configured for improved patient comfort and aftercare
US20050240141 *Apr 26, 2004Oct 27, 2005Peter AliskiStent kidney curl improvements
US20050240277 *Apr 26, 2004Oct 27, 2005Peter AliskiStent with flexible elements
US20050240278 *Apr 26, 2004Oct 27, 2005Peter AliskiStent improvements
US20050240280 *Apr 26, 2004Oct 27, 2005Peter AliskiUreteral stent
US20070050006 *Aug 30, 2006Mar 1, 2007Cook Ireland LimitedCoaxial dilatation method for stent implantation
US20070078446 *Aug 31, 2005Apr 5, 2007Cook Ireland Limited And Cook IncorporatedStent for implantation
US20070276466 *May 14, 2007Nov 29, 2007Vance Products Inc., D/B/A/ Cook Urological Inc.Stent for implantation
US20090299488 *May 22, 2007Dec 3, 2009Marian DevonecProstatic stent
US20110251671 *Oct 12, 2009Oct 13, 2011Kevin HeratyStent suitable for deployment in a blood vessel
US20120158025 *Dec 15, 2011Jun 21, 2012Christopher AndersonAnastomosis device and related methods
US20160015509 *Jul 21, 2014Jan 21, 2016Ardle Tomás McDonoughImplantable stent
CN102655824A *Nov 12, 2010Sep 5, 2012奥林巴斯医疗株式会社Medical stent
CN104001257A *Jun 13, 2014Aug 27, 2014胡冰Double-pigtail stent placed in left hepatic duct of human body
EP2489334A1 *Nov 12, 2010Aug 22, 2012Olympus Medical Systems Corp.Medical stent
EP2489334A4 *Nov 12, 2010Aug 22, 2012Olympus Medical Systems CorpMedical stent
EP2567727A1 *Sep 5, 2012Mar 13, 2013Cook Medical Technologies LLCElectrically charged medical device
EP2609892A1 *Dec 20, 2012Jul 3, 2013Cook Medical Technologies LLCUreteral stent
EP2803339A1 *Nov 12, 2010Nov 19, 2014Olympus Medical Systems Corp.Medical stent
EP3045201A1 *Jan 6, 2016Jul 20, 2016Cook Medical Technologies LLCUreteral stent with sideports
WO2007135564A2 *May 22, 2007Nov 29, 2007Marian DevonecProstatic stent
WO2007135564A3 *May 22, 2007Apr 17, 2008Marian DevonecProstatic stent
WO2014151557A2 *Mar 13, 2014Sep 25, 2014Pneumrx, Inc.Torque alleviating intra-airway lung volume reduction compressive implant structures
WO2014151557A3 *Mar 13, 2014Nov 13, 2014Pneumrx, Inc.Torque alleviating intra-airway lung volume reduction compressive implant structures
Classifications
U.S. Classification604/8
International ClassificationA61F2/04, A61M25/00, A61F2/88
Cooperative ClassificationA61M27/008, A61F2/04, A61F2/88
European ClassificationA61M27/00C3, A61F2/04B, A61F2/88
Legal Events
DateCodeEventDescription
Oct 30, 2002ASAssignment
Owner name: SCIMED LIFE SYSTEMS, INC., MINNESOTA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GELLMAN, BARRY N.;REEL/FRAME:013448/0230
Effective date: 20021015
Mar 14, 2006ASAssignment
Owner name: BOSTON SCIENTIFIC SCIMED, INC., MINNESOTA
Free format text: CHANGE OF NAME;ASSIGNOR:SCIMED LIFE SYSTEMS, INC.;REEL/FRAME:017335/0736
Effective date: 20041222