# US 4,307,723 A · Externally grooved ureteral stent

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- Number: US 4,307,723 A
- Document ID: US4307723A
- Status: Granted
- Kind: A
- Application number: 06/119,865
- Filed: 1980-02-08
- Granted: 1981-12-29
- Earliest claimed: 1978-04-07
- Assignees: Medical Engineering Corporation
- Inventors: Roy P. Finney
- Web page: https://patentgrep.com/patent/US4307723A

## CPC

- A61M 27/008: {pre-shaped, for use in the urethral or ureteral tract}
- A61F 2/04: Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts (A61F2/18, A61F2/20 take precedence; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95)
- A61M 25/0021: {characterised by the form of the tubing (A61M25/0054 takes precedence)}
- A61M 25/0108: {using radio-opaque or ultrasound markers}
- A61M 2025/0019: {Cleaning catheters or the like, e.g. for reuse of the device, for avoiding replacement}
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- 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 (dental prosthetics A61C)

## Abstract

The stent is an elongated, flexible generally cylindrical member. One of the ends of the stent is closed and set in the form of a hook and the other end is set in the form of a hook with a long intermediate portion connecting the hook ends. The stent is provided with at least one longitudinally extending groove to provide a passage for fluid and a wire stylet. The stylet is used to straighten the curved ends so that the stent can be cystoscopically inserted within the patient, the stylet being removed when the stent is properly positioned so that upon removal the hooks will reform and prevent the stent from migrating.

## Claims

### Claim 1

A ureteral stent for use in maintaining urinary drainage in a patient, which stent comprises an elongated, flexible, generally cylindrical member of substantially uniform outside diameter throughout its entire length, said member having a proximal end which is closed and set in the form of a hook, a relatively long straight intermediate section and a distal end which is also set in the form of a hook, said member having at least one longitudinally extending external groove to provide a passage for fluid and wire stylet retaining means which permit the use of a wire stylet to straighten the member, including the hooks, so that the member can be cystoscopically inserted and positioned within the patient and which permit the stylet to be removed when the stent is properly positioned so that upon removal the hooks will reform and prevent the member from migrating.

### Claim 2

A ureteral stent comprises an elongated relatively flexible member having at least one longitudinally extending external groove to provide a passage for fluid flow along the outer surface of the member, the end portions of said member being set in the form of hooks, at least one of which has a rounded end, said member including wire stylet retaining means which enable the user to forcibly straighten the hooks to facilitate the placement of the stent in a body passageway.

### Claim 3 (depends on 2)

The stent of claim 2 in which the member is of substantially uniform outer diameter throughout its length.

### Claim 4 (depends on 2)

The stent of claim 2 in which the member is of a silicone elastomer material.

### Claim 5 (depends on 2)

The stent of claim 2 in which both end portions have rounded ends.

### Claim 6 (depends on 2)

The stent of claim 2 in which the member is of an unreinforced silicone elastomer having a durometer of about 70 Shore `A`.

### Claim 7 (depends on 2)

The stent of claim 2 in which the hook portions extend in opposite directions.

### Claim 8 (depends on 2)

The stent of claim 2 in which the wire stylet retaining means is a pair of lips on the groove which once the stylet is in the groove prevents the stylet from being accidentally dislodged therefrom.

### Claim 9 (depends on 2)

The stent of claim 2 in which the wire stylet retaining means is a longitudinal extending lumen in the member.

### Claim 10

A kit for providing urinary drainage comprising:
(a) a wire stylet, and
(b) a ureteral catheter stent comprising an elongated relatively flexible member having at least one longitudinally extending external groove to provide a passage for fluid flow, said member having end portions set in the form of hooks at least one of which has a rounded end, and wire stylet retaining means which enable the user to forcibly straighten the hooks to facilitate the placement of the stent in a body passageway.

### Claim 11 (depends on 9)

The kit of claim 9 in which the stent is comprised of silicone elastomer having a durometer of about 70.

### Claim 12 (depends on 9)

The kit of claim 9 in which both hook portions of the stent have rounded ends.

### Claim 13 (depends on 9)

The kit of claim 9 in which the hook portions of the stent extend in opposite directions.

### Claim 14 (depends on 9)

The kit of claim 9 in which the stent is of a material which is radiopaque to x-rays.