US20130152651A1 - Stylet having a roughened outer surface - Google Patents
Stylet having a roughened outer surface Download PDFInfo
- Publication number
- US20130152651A1 US20130152651A1 US13/597,775 US201213597775A US2013152651A1 US 20130152651 A1 US20130152651 A1 US 20130152651A1 US 201213597775 A US201213597775 A US 201213597775A US 2013152651 A1 US2013152651 A1 US 2013152651A1
- Authority
- US
- United States
- Prior art keywords
- stylet
- catheter
- disposable
- treated
- roughened
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
Images
Classifications
-
- 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
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/0102—Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
-
- 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
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M2025/0063—Catheters; Hollow probes characterised by structural features having means, e.g. stylets, mandrils, rods or wires to reinforce or adjust temporarily the stiffness, column strength or pushability of catheters which are already inserted into the human body
Definitions
- stiffening member or stylet within a flexible catheter to stiffen the catheter to help guide the introduction of the catheter into the desired location in a patient is well known. Conventionally once the catheter is in place, the stylet is removed and discarded.
- ventricular catheters are often made of low durometer silicone.
- ventricular catheters are often made of low durometer (about 50 A) silicone, and have a predetermined outer diameter, inner diameter and length.
- Such a ventricular catheter is often provided preloaded with a polished stainless steel round stylet.
- neurosurgeons have frequently complained that they experience great difficulty when removing the stylet from the catheter due to friction between the stylet and catheter, which can cause, among other things, displacement of the distal end of the catheter from the target site, and/or cutting of the catheter.
- surgeons have been generally dissatisfied with these attempts as they are accustomed to a conventional catheter feel and design. For example, surgeons have complained that a square-shaped stylet does not provide them with the same placement feel as a conventional round stylet.
- a stylet that can be preloaded in a conventional catheter, such as, for example, a low durometer catheter, and can provide sufficient stiffness to the catheter to assist a user in guiding the catheter to its desired location in a patient while thereafter permitting the stylet to be easily removed from the catheter.
- the present invention generally provides a stylet that has a proximal end, a distal end and an outer surface.
- the stylet is substantially cylindrical.
- the outer surface of the stylet is treated, or roughened, preferably by a glass peening or a bead blasting operation, such that its maximum profile peak height is greater than 30 ⁇ m, its roughness average is greater than 5 ⁇ m, and its root mean square roughness is greater than 8 ⁇ m. This results in reducing the removal force of the treated stylet from a silicone catheter.
- FIG. 1 is a side view of a test method for removing a stylet from a catheter, according to the present invention
- FIG. 2 is a cross-sectional view of the stylet only taken along lines 2 - 2 of FIG. 1 and looking in the direction of the arrows;
- FIG. 3 is a chart illustrating the stylet removal force of a conventional stylet and a roughened stylet according to the present invention.
- FIG. 4 is a chart showing various roughness properties of a conventional stylet and a roughened stylet according with the present invention.
- the present invention generally provides a stylet 10 that has an elongate stylet body 12 having a proximal end 14 , a distal end and an outer surface 16 .
- the stylet is substantially cylindrical at least for a majority of its length, and preferably for its entire length.
- Outer surface 16 is treated, or roughened, preferably by a glass peening or a bead blasting operation, such that its maximum profile peak height is greater than 30 ⁇ m, its roughness average is greater than 5 ⁇ m, and its root mean square roughness is greater than 8 ⁇ m.
- stylet 10 is subject to a glass shot peening for at least 10 minutes with a glass shot size of about 100 ⁇ m and with an intensity range between 30-60 psi. This results in the stylet 10 being essentially 100% treated along the majority of the stylet's length.
- Stylet 10 is preferably preloaded in a low durometer catheter 18 .
- the stylet provides sufficient stiffness to the catheter to assist a user in guiding the catheter to its desired location in a patient. Thereafter, because the outer surface of stylet 10 has been roughened, stylet 10 is easily removed from the catheter 18 by a user.
- stylet 10 is made of stainless steel, and catheter 18 is made of silicone.
- FIG. 1 a test method is illustrated, which was used to compare the removal force of a catheter according to the present invention as compared to a conventional stainless steel polished round stylet.
- this test method the following steps are followed:
- the stylet removal force according to the present invention for a 1.0 mm round stylet is about 0.1 lbf, whereas for a conventional round stylet, which is 0.7 mm round or 1.0mm round, the removal force is about 1.1 lbf as shown on FIG. 3 .
- the removal force is about a magnitude of order less when using a stylet that has been treated in accordance with the present invention.
- FIG. 4 a chart showing various roughness properties of a conventional stylet (CTRL 1 and CTRL 2) and a roughened stylet in accordance with the present invention (30 1, 30 2, 60 1, and 60 2). The properties were measured in accordance with ANSI B46.1: 1985 and ISO 4287: 1996.
Abstract
A stylet has a proximal end a distal end and an outer surface. The stylet is substantially cylindrical. The outer surface of the stylet is treated, or roughened, preferably by a glass peening or a bead blasting operation, such that its maximum profile peak height is greater than 30 μm, its roughness average is greater than 5 μm, and its root mean square roughness is greater than 8 μm. This results in reducing the removal force of the treated stylet from a silicone catheter.
Description
- The use of a stiffening member or stylet within a flexible catheter to stiffen the catheter to help guide the introduction of the catheter into the desired location in a patient is well known. Conventionally once the catheter is in place, the stylet is removed and discarded.
- Catheters are often made of low durometer silicone. For example, ventricular catheters are often made of low durometer (about 50 A) silicone, and have a predetermined outer diameter, inner diameter and length. Such a ventricular catheter is often provided preloaded with a polished stainless steel round stylet. However, neurosurgeons have frequently complained that they experience great difficulty when removing the stylet from the catheter due to friction between the stylet and catheter, which can cause, among other things, displacement of the distal end of the catheter from the target site, and/or cutting of the catheter.
- To reduce the friction, attempts have been made to coat the stylet with PTFE or modify the geometrical shape so that it has a square cross-section. Others still have tried to modify the manufacturing process to decrease the amount of so called stickiness of the catheter by either including a post curing process or compounding the catheter with a filler, such as barium sulfate.
- However, surgeons have been generally dissatisfied with these attempts as they are accustomed to a conventional catheter feel and design. For example, surgeons have complained that a square-shaped stylet does not provide them with the same placement feel as a conventional round stylet.
- Accordingly, there remains a need for a stylet that can be preloaded in a conventional catheter, such as, for example, a low durometer catheter, and can provide sufficient stiffness to the catheter to assist a user in guiding the catheter to its desired location in a patient while thereafter permitting the stylet to be easily removed from the catheter.
- It is also an aspect of the invention to provide a stylet design that is simple to produce and that can be made of standard materials by convenient and cost effective procedures.
- In light of the present disclosure and the practice of the present invention, other advantages and solutions to other problems will become apparent to those skilled in the relevant art.
- The present invention generally provides a stylet that has a proximal end, a distal end and an outer surface. The stylet is substantially cylindrical. The outer surface of the stylet is treated, or roughened, preferably by a glass peening or a bead blasting operation, such that its maximum profile peak height is greater than 30 μm, its roughness average is greater than 5 μm, and its root mean square roughness is greater than 8 μm. This results in reducing the removal force of the treated stylet from a silicone catheter.
- The invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a side view of a test method for removing a stylet from a catheter, according to the present invention; -
FIG. 2 is a cross-sectional view of the stylet only taken along lines 2-2 ofFIG. 1 and looking in the direction of the arrows; -
FIG. 3 is a chart illustrating the stylet removal force of a conventional stylet and a roughened stylet according to the present invention; and -
FIG. 4 is a chart showing various roughness properties of a conventional stylet and a roughened stylet according with the present invention. - Referring now to
FIGS. 1 and 2 , the present invention generally provides astylet 10 that has an elongatestylet body 12 having a proximal end 14, a distal end and anouter surface 16. For the sake of clarity in the drawings, only the cross-section of the stylet is shown inFIG. 2 . The stylet is substantially cylindrical at least for a majority of its length, and preferably for its entire length.Outer surface 16 is treated, or roughened, preferably by a glass peening or a bead blasting operation, such that its maximum profile peak height is greater than 30 μm, its roughness average is greater than 5 μm, and its root mean square roughness is greater than 8 μm. - Surface treatment is typically provided by conventional shot peening. As one skilled in the art is readily aware, in shot peening, metal or glass shot is bombarded against the surface of the component with suitable intensity and overlapping coverage. The conventional use for shot peening is to reduce the potential for stress cracking on metal parts by creating a compressed layer at the surface. The present inventors use the shot peening process to roughen the outer surface of the stylet. U.S. Pat. No. 5,057,108 issued to Shetty et al. discloses a process of stainless steel shot blasting, glass bead blasting, electropolishing, and passivation. In addition, a method of surface finishing a medical device shield using metallic media is described in U.S. Pat. No. 5,673,473 to Johnson, et al. The disclosures of these two U.S. Patents are hereby fully incorporated by reference in their entirety. In a currently preferred exemplary embodiment,
stylet 10 is subject to a glass shot peening for at least 10 minutes with a glass shot size of about 100 μm and with an intensity range between 30-60 psi. This results in thestylet 10 being essentially 100% treated along the majority of the stylet's length. The test results shown inFIGS. 3 and 4 included stylets treated in this manner. -
Stylet 10 is preferably preloaded in alow durometer catheter 18. When preloaded, the stylet provides sufficient stiffness to the catheter to assist a user in guiding the catheter to its desired location in a patient. Thereafter, because the outer surface ofstylet 10 has been roughened,stylet 10 is easily removed from thecatheter 18 by a user. In a currently preferred exemplary embodiment,stylet 10 is made of stainless steel, andcatheter 18 is made of silicone. - Referring now to
FIG. 1 , a test method is illustrated, which was used to compare the removal force of a catheter according to the present invention as compared to a conventional stainless steel polished round stylet. In accordance with this test method, the following steps are followed: - 1. Place catheter with loaded stylet onto a flat bench top surface 20 such that the proximal end of the catheter extends over the edge of the table.
- 2. Place a 130 g weight approximately 2 cm from the proximal end of the catheter. (This is to consistently hold the catheter in place during the test without compressing the ID against the stylet.)
- 3. Connect a digital force gauge to the stylet (e.g., a Shimpo Digital Force Tester, 0-10 N)
- 4. Tare the force gauge and set for peak hold; and
- 5. Extract the stylet from the catheter and record the peak load required to remove it from the catheter.
- Following this test procedure, the stylet removal force according to the present invention for a 1.0 mm round stylet is about 0.1 lbf, whereas for a conventional round stylet, which is 0.7 mm round or 1.0mm round, the removal force is about 1.1 lbf as shown on
FIG. 3 . Thus, the removal force is about a magnitude of order less when using a stylet that has been treated in accordance with the present invention. - Referring now to
FIG. 4 , a chart showing various roughness properties of a conventional stylet (CTRL 1 and CTRL 2) and a roughened stylet in accordance with the present invention (30 1, 30 2, 60 1, and 60 2). The properties were measured in accordance with ANSI B46.1: 1985 and ISO 4287: 1996. - One skilled in the art will appreciate further features and advantages of the invention based on the above-described embodiments. Accordingly, the invention is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. All publications and references cited herein are expressly incorporated herein by reference in their entirety.
Claims (2)
1. A method of treating a disposable stylet so that it can be easily removed from a catheter, wherein the catheter is made of an elastomeric material, and the disposable stylet is made of a rigid material, the disposable stylet having an elongate stylet body having a proximal end, a distal end and an outer surface, said disposable stylet being substantially cylindrical at least for a majority of its length, the method comprising the steps of:
subjecting the stylet body of the disposable stylet to a glass shot peening process for at least 10 minutes with a glass shot size of about 100 μm and with an intensity range between 30-60 psi.
2. The method of treating a disposable stylet according to claim 12, wherein the subjecting step achieves essentially 100% coverage along the majority of the disposable stylet's length.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/597,775 US20130152651A1 (en) | 2006-10-30 | 2012-08-29 | Stylet having a roughened outer surface |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US86350806P | 2006-10-30 | 2006-10-30 | |
US11/559,689 US20080103448A1 (en) | 2006-10-30 | 2006-11-14 | Stylet Having a Roughened Outer Surface |
US13/597,775 US20130152651A1 (en) | 2006-10-30 | 2012-08-29 | Stylet having a roughened outer surface |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/559,689 Continuation US20080103448A1 (en) | 2006-10-30 | 2006-11-14 | Stylet Having a Roughened Outer Surface |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130152651A1 true US20130152651A1 (en) | 2013-06-20 |
Family
ID=39148599
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/559,689 Abandoned US20080103448A1 (en) | 2006-10-30 | 2006-11-14 | Stylet Having a Roughened Outer Surface |
US13/597,775 Abandoned US20130152651A1 (en) | 2006-10-30 | 2012-08-29 | Stylet having a roughened outer surface |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/559,689 Abandoned US20080103448A1 (en) | 2006-10-30 | 2006-11-14 | Stylet Having a Roughened Outer Surface |
Country Status (7)
Country | Link |
---|---|
US (2) | US20080103448A1 (en) |
EP (1) | EP1917995B1 (en) |
AT (1) | ATE471734T1 (en) |
AU (1) | AU2007231251B2 (en) |
CA (1) | CA2608215C (en) |
DE (1) | DE602007007272D1 (en) |
PL (1) | PL1917995T3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130096482A1 (en) | 2011-10-18 | 2013-04-18 | Medtronic Xomed, Inc. | Alternate geometry stylet for ventricular shunt catheter placement |
JP5992533B2 (en) * | 2011-12-13 | 2016-09-14 | カーディアック ペースメイカーズ, インコーポレイテッド | Implantable medical device header and method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5019076A (en) * | 1986-09-12 | 1991-05-28 | Yamanashi William S | Radio frequency surgical tool and method |
US5573532A (en) * | 1995-01-13 | 1996-11-12 | Cryomedical Sciences, Inc. | Cryogenic surgical instrument and method of manufacturing the same |
US20050059994A1 (en) * | 2003-09-17 | 2005-03-17 | Steven Walak | Fatigue resistant medical devices |
US20050182478A1 (en) * | 2004-02-13 | 2005-08-18 | Scimed Life Systems, Inc. | Laser shock peening of medical devices |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3419010A (en) * | 1966-01-17 | 1968-12-31 | Cordis Corp | Catheter |
US4529400A (en) * | 1984-03-23 | 1985-07-16 | Scholten James R | Apparatus for naso and oroendotracheal intubation |
US4636200A (en) * | 1985-09-17 | 1987-01-13 | Chesebrough-Pond's Inc. | Intubating device |
US5057108A (en) * | 1990-01-12 | 1991-10-15 | Zimmer, Inc. | Method of surface finishing orthopedic implant devices |
US5673473A (en) | 1993-06-25 | 1997-10-07 | Medtronic, Inc. | Method of surface finishing a medical device shield using metallic media |
US5876408A (en) * | 1997-06-12 | 1999-03-02 | Sulzer Intermedics, Inc. | Method for enhancing implantation of thin leads |
-
2006
- 2006-11-14 US US11/559,689 patent/US20080103448A1/en not_active Abandoned
-
2007
- 2007-10-23 AU AU2007231251A patent/AU2007231251B2/en not_active Ceased
- 2007-10-26 CA CA2608215A patent/CA2608215C/en not_active Expired - Fee Related
- 2007-10-29 EP EP07254276A patent/EP1917995B1/en active Active
- 2007-10-29 AT AT07254276T patent/ATE471734T1/en not_active IP Right Cessation
- 2007-10-29 PL PL07254276T patent/PL1917995T3/en unknown
- 2007-10-29 DE DE602007007272T patent/DE602007007272D1/en active Active
-
2012
- 2012-08-29 US US13/597,775 patent/US20130152651A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5019076A (en) * | 1986-09-12 | 1991-05-28 | Yamanashi William S | Radio frequency surgical tool and method |
US5573532A (en) * | 1995-01-13 | 1996-11-12 | Cryomedical Sciences, Inc. | Cryogenic surgical instrument and method of manufacturing the same |
US20050059994A1 (en) * | 2003-09-17 | 2005-03-17 | Steven Walak | Fatigue resistant medical devices |
US20050182478A1 (en) * | 2004-02-13 | 2005-08-18 | Scimed Life Systems, Inc. | Laser shock peening of medical devices |
Also Published As
Publication number | Publication date |
---|---|
US20080103448A1 (en) | 2008-05-01 |
EP1917995B1 (en) | 2010-06-23 |
EP1917995A3 (en) | 2008-10-15 |
ATE471734T1 (en) | 2010-07-15 |
PL1917995T3 (en) | 2011-04-29 |
AU2007231251B2 (en) | 2013-06-27 |
DE602007007272D1 (en) | 2010-08-05 |
AU2007231251A1 (en) | 2008-05-15 |
EP1917995A2 (en) | 2008-05-07 |
CA2608215A1 (en) | 2008-04-30 |
CA2608215C (en) | 2015-03-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU2012326184B2 (en) | Alternate geometry stylet for ventricular shunt catheter placement | |
US20170360467A1 (en) | Retractable separating systems and methods | |
CA2861241C (en) | Dilator sheath combination with bumped dilator tip | |
DE19808220B4 (en) | Nadeltrokar | |
US20140148651A1 (en) | Novel bumped dilator tip | |
JP2008528217A (en) | Biopsy needle for histological examination of body tissue | |
JP2019508212A5 (en) | ||
US20130152651A1 (en) | Stylet having a roughened outer surface | |
JP2019524226A5 (en) | Introducer sheaths, introducer sets and methods for providing vascular access | |
EP1728531A1 (en) | Thrombus suction catheter | |
EP2217160B1 (en) | Safety stylet | |
US5342325A (en) | Introducer needle and catheter assembly | |
US4111190A (en) | Medical applicator assembly for chain cystourethrographic procedure | |
EP4249030A1 (en) | Medical catheter and preparation method therefor | |
EP2942079A1 (en) | Balloon catheter | |
US8147465B2 (en) | Delivery needle apparatus with sleeve | |
US20190224456A1 (en) | Graded stiffness guidewire | |
JP2018519125A (en) | Surface-cured injection needle and method for producing the same | |
US11577048B2 (en) | Medical device bending tool | |
AU772060B2 (en) | Needle safety device | |
DD288527A5 (en) | DEVICE FOR POSITIONING IMPLANTS |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCV | Information on status: appeal procedure |
Free format text: ON APPEAL -- AWAITING DECISION BY THE BOARD OF APPEALS |
|
STCV | Information on status: appeal procedure |
Free format text: BOARD OF APPEALS DECISION RENDERED |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION |