GB2064963A - Stylet - Google Patents

Stylet Download PDF

Info

Publication number
GB2064963A
GB2064963A GB8039834A GB8039834A GB2064963A GB 2064963 A GB2064963 A GB 2064963A GB 8039834 A GB8039834 A GB 8039834A GB 8039834 A GB8039834 A GB 8039834A GB 2064963 A GB2064963 A GB 2064963A
Authority
GB
United Kingdom
Prior art keywords
stylet
taper
wire
distal end
inches
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.)
Granted
Application number
GB8039834A
Other versions
GB2064963B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Medtronic Inc
Original Assignee
Medtronic Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US10324979A priority Critical
Application filed by Medtronic Inc filed Critical Medtronic Inc
Publication of GB2064963A publication Critical patent/GB2064963A/en
Application granted granted Critical
Publication of GB2064963B publication Critical patent/GB2064963B/en
Application status is Expired legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00Electrotherapy; Circuits therefor
    • A61N1/02Details
    • A61N1/04Electrodes
    • A61N1/05Electrodes for implantation or insertion into the body, e.g. heart electrode
    • A61N1/056Transvascular endocardial electrode systems

Abstract

A stylet 10 for use with a transvenous pacing lead includes a longitudinal stylet wire 12 with a constant diameter portion adjacent its proximal end, a handle 16 affixed to the proximal end of the stylet wire, a taper 14 of a predetermined length formed adjacent to the distal end 20 of the stylet wire, and a ball 18 affixed to the end 20 of the stylet wire where the ball 18 has a diameter substantially equal to the constant diameter of the stylet wire. The taper at the distal end of the stylet provides strain relief, less rigidity of the stylet wire and complies with bends of the transvenous pacing lead and the ball prevents the stylet from perforating the lead. In an alternative embodiment there is a reduced constant diameter portion between the taper 14 and the ball 18. <IMAGE>

Description

SPECIFICATION Stylet The present invention relates to a surgical instrument, and more particularly, relates to a stylet for use in inserting a transvenous pacing lead.

Prior art stylets usually have consisted of a stylet wire with constant diameter along the entire length of the stylet wire and including a handle affixed to the proximal end. This type of stylet has two disadvantages: the first being rigidity along the entire length of the stylet wire; and the second being that the end of the stylet wire sometimes punctures the coil end insulation of a transvenous pacing lead.

The first disadvantage with a stylet wire of constant diameter is that there is limited flexibility as the entire length of the stylet wire is rigid, especially at the end of the stylet wire. Consequently, the stylet wire sometimes does not comply with the bends and curvaturesofatransvenous pacing lead during insertion of the pacing lead. Also, it is sometimes difficult for medical personnel to push a stylet wire through a transvenous pacing lead. The second disadvantage is that the sharp edges of the distal end of the stylet wire sometimes will protrude through a curve or bend in a transvenous pacing lead thereby violating the wire coil and insulation of the lead. Sometimes, the end of the stylet wire will also puncture the vein or worse yet, puncture heart tissue or heart wall.Also, instead of the stylet complying to a bend in the lead, the lead's bend becomes sharper, using present stylets, allowing the stylet tip to perforate the lead.

According to the invention there is provided a stylet for guiding implantation of a transvenous pacing lead comprising a stylet wire having a handle at a proximal end thereof, wherein a distal portion of said wire is more flexible than a proximal portion, and the distal end is provided with means for preventing perforation of said lead.

Preferably said proximal portion has a constant diameter and said distal portion tapers over a predetermined length from said constant diameter of said stylet wire to a predetermined smaller diameter and said means for preventing perforation comprises a ball affixed to said distal end of said stylet wire.

According to a preferred embodiment of the present invention, there is provided a stylet including a stylet wire having a handle affixed to a proximal end, a taper at or near the distal end of the stylet wire, and a round ball affixed to the distal end of the stylet wire whereby the taper at or near the distal end of the stylet wire provides strain relief and compliance with curvatures and bends while passed through a transvenous pacing lead and the ball at the distal end of the stylet wire provides for easy passage of the distal end of the stylet wire through the transvenous pacing lead.

Two preferred embodiments of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 illustrates a plan view of a stylet, according to the present invention, where the proximal end is shown broken; Figure 2 illustrates an enlarged plan view of the distal end of the stylet of Figure 1; and Figure 3 illustrates an enlarged plan view of an alternative embodiment of a distal end of a stylet according to the present invention.

Figure 1 which illustrates a plan view of a stylet 10, shows a longitudinal stylet wire 12 having a taper 14 at a distal portion and a handle 16 affixed to the proximal end of the stylet wire 12 by structure known in the art. For purposes of clarity in the drawings for illustrating the distal end and proximal end of the stylet wire 12, the stylet wire is broken as illustrated in the figure. Ball 18 is affixed to a distal end 20 of the taper 14 by processes known in the art, such as by welding.

Taper 14 is a gradual taper of the diameter of the wire from junction 22 where the taper begins to the distal end 20 of the stylet wire 12 at which point the ball 18 is secured to the distal end 20. Taper 14 can be formed such as by centerless grinding or a drawing process by way of example and for purposes of illustration only. The length of the taper 14 is predetermined by a number of factors, such as the diameter of the stylet wire, the spring constant of the stylet wire, the particular application of the stylet for use in a transvenous pacing lead to a heart appendage, and other considerations as dictated by the medical factors. The length of the taper 14 can vary in the range of a few inches, such as three or four, to a quarter of an inch.By way of example and for purposes of illustration, the taper 14 has been shown to extend over one-half inch of the distal end of the stylet wire 12. The diameter of the ball 18 is considered to be the same diameter as the constant diameter of the proximal portion of the stylet wire, but may range in size to be more or less than the constant diameter of the stylet wire 12.

Figure 2 shows the stylet wire 12 having a diameter of .014 inches, a taper from the junction 22 down to the distal end 20 of .014 to .008 inches, although the .008 inches could be in the range of .01 to .006 or less or, alternatively as great as .009 to .013 and the diameter of the ball 18 is substantially equal to the diameter of stylet wire 12, .014 inches.

In use the stylet 10 of the present invention can be inserted into a transvenous pacing lead before the transvenous pacing lead is passed through a vein, or alternatively, stylet 12 can be inserted into the transvenous pacing lead on initial passing of the transvenous pacing lead through a vein or after the distal end of the lead has been placed within the body. The ball 18 provides smooth insertion of the stylet 12 within a transvenous pacing lead without the concern of the distal end of the stylet wire 12 violating the wound coil of the transvenous pacing lead or protruding through the insulation of the transvenous pacing lead. The distal end of the stylet 10, especially over the length of the taper 14, provides a "soft tip" which complies with the curvature and bends of the transvenous pacing lead, allowing for easy insertion and control around the curves and bends of the lead.

Figure 3 is an enlarged plan view of a distal end of an alternative embodiment of a stylet 30, which includes a stylet wire 32 having a constant diameter proximal portion, the proximal end of which connects to a stylet handle as previously described for Figures 1 and 2 and not illustrated for purposes of clarity in the drawing, and having a taper 34 running from the junction 36 of the constant diameter of the stylet wire 32 and the taper 34 to a junction 38 of the end of the taper 34 of the stylet wire 32 and a portion 40 of small constant diameter. A ball 42 of a diameter substantially equal to the constant diameter of the proximal portion of stylet wire 32 affixes to the distal end of the constant diameter portion 40.As previously described and by way of example and for purposes of illustration only, the diameter of the stylet wire 32 can be .014 inches, the taper can occur three-quarters of the length of the distal portion of the stylet wire measured from the junction 36 to the ball 42, such as from .014 inches to .008 inches, and remaining portion 40 can be of constant diameter of .008 inches by way of example and for purposes of illustration only while the constant diameter portion 40 can be in the last one-quarter of the length of the distal portion from junction 36 to ball 42. The numerical diameters and length are by way of example and for purposes of illustration only in illustrating an operative alternative embodiment of the present invention, can be varied depending upon the particular medical application, and are not to be construed as limiting the present invention.

Thus a stylet according to the present invention provides a soft tip stylet which complies with curvatures and bends of the transvenous pacing lead and includes a ball at the distal end of the stylet wire which easily passes through the transvenous pacing lead.

Various modifications can be made to the stylet of the present invention without departing from the apparent scope of the present invention.

Claims (16)

1. Astyletforguiding implantation ofatransvenous pacing lead comprising a styletwire having a handle at a proximal end thereof, wherein a distal portion of said wire is more flexible than a proximal portion, and the distal end is provided with means for preventing perforation of said lead.
2. A stylet as claimed in claim 1 wherein said proximal portion has a constant diameter and said distal portion tapers over a predetermined length from said constant diameter of said stylet wire to a predetermined smaller diameter and said means for preventing perforation comprises a ball affixed to said distal end of said stylet wire.
3. A stylet as claimed in claim 2 wherein said taper terminates at said distal end of said stylet wire.
4. A stylet as claimed in claim 2 wherein said taper terminates before said distal end of said stylet wire.
5. A stylet as claimed in claim 4 comprising a portion of small constant diameter between the distal end of the taper and the distal end of the stylet wire.
6. A stylet as claimed in claim 5 wherein said taper occurs over three-quarters of the length of the said distal portion of said stylet wire and said small constant diameter portion occurs over one-quarter of the length of the distal portion.
7. A stylet as claimed in claim 5 or 6 wherein said small constant diameter is substantially .008 inches.
8. A stylet as claimed in any of claims 2 to 7 wherein said ball is substantially equal in diameter to said constant diameter of the stylet wire.
9. A stylet as claimed in any of claims 2 to 8 wherein said constant diameter of the stylet wire is substantially .014 inches.
10. A stylet as claimed in any of claims 2 to 9 wherein said taper is substantially from .014to .008 inches.
11. A stylet as claimed in any of claims 2 to 9 wherein said taper is from substantially .014 to the range of .006 to .01 inches.
12. A stylet as claimed in any of claims 2 to 9 wherein the taper is from substantially .014 to the range of .009 to .013 inches.
13. A stylet as claimed in any of claims 2 to 9 wherein said taper is in the range of.014 to .006 inches to the range of .013 to .006 inches.
14. A stylet as claimed in any of claims 2 to 13 wherein the longitudinal length of said taper is from four inches to one-quarter inch.
15. A stylet for use with a transvenous pacing lead, comprising a styletwire including a handle affixed to a proximal end of the stylet wire, a taper over a predetermined length from the diameter of the stylet wire to a predetermined smaller diameter adjacent to the distal end of the stylet wire whereby said taper provides a stylet portion of greater flexibility.
16. A stylet for use with a transvenous pacing lead, substantially as hereinbefore described with reference to the accompanying drawings.
GB8039834A 1979-12-13 1980-12-12 Stylet Expired GB2064963B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10324979A true 1979-12-13 1979-12-13

Publications (2)

Publication Number Publication Date
GB2064963A true GB2064963A (en) 1981-06-24
GB2064963B GB2064963B (en) 1984-06-13

Family

ID=22294178

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8039834A Expired GB2064963B (en) 1979-12-13 1980-12-12 Stylet

Country Status (6)

Country Link
JP (1) JPS617684Y2 (en)
CA (1) CA1150580A (en)
DE (1) DE3046691A1 (en)
FR (1) FR2471790B3 (en)
GB (1) GB2064963B (en)
NL (1) NL8006752A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3334546A1 (en) * 1982-09-24 1984-03-29 Viridian Inc Fuehrungssonde for a hose means for passing and suction of fluid in and out of the gastrointestinal tract of a patient
FR2583985A1 (en) * 1985-06-27 1987-01-02 Nivarox Sa Stylet for electrode implantable in the body
US4677990A (en) * 1985-02-28 1987-07-07 Siemens Aktiengesellschaft Endocardial electrode controllable to form selected contours
WO1992001436A1 (en) * 1990-07-19 1992-02-06 Sherwood Medical Company Improved enteral feeding tube
US5160325A (en) * 1986-10-06 1992-11-03 C. R. Bard, Inc. Catheter with novel lumens shapes
US5242389A (en) * 1990-07-19 1993-09-07 Sherwood Medical Company Enteral feeding tube enteral feeding tube with separate stylet lumen
EP0648473A1 (en) * 1993-10-18 1995-04-19 Ethicon, Inc. Blunt point needles
DE10017147A1 (en) * 2000-04-03 2001-10-18 Wolfram Voelker Guide wire to be used for balloon angioplasty, comprising outer cover accommodating movable inner wire
EP1652548A1 (en) * 2004-11-01 2006-05-03 Terumo Kabushiki Kaisha Medical guide wire
CN106999182A (en) * 2014-10-15 2017-08-01 史密夫和内修有限公司 Anchoring piece/implant configuration device and relative method of tissue repair
US9895165B2 (en) 2013-03-15 2018-02-20 Smith & Nephew, Inc. Surgical needle
US10499904B2 (en) 2015-02-17 2019-12-10 Smith & Nephew, Inc. Anchor insertion system and method of use thereof
US10531892B2 (en) 2013-03-13 2020-01-14 Smith & Nephew, Inc. Surgical needle

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2635318C2 (en) * 2012-03-13 2017-11-10 Смит Энд Нефью, Инк. Surgical needle
US10327862B2 (en) 2014-09-17 2019-06-25 Covidien Lp Fiducial marker deployment system
US10485583B2 (en) 2015-10-07 2019-11-26 Covidien Lp Endoscopic ultrasound fine needle fiducial system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348548A (en) * 1965-04-26 1967-10-24 William M Chardack Implantable electrode with stiffening stylet
US3521620A (en) * 1967-10-30 1970-07-28 William A Cook Vascular coil spring guide with bendable tip
US3827434A (en) * 1972-06-21 1974-08-06 Vicra Sterile Inc Catheter insertion device
JPS5637698Y2 (en) * 1977-12-15 1981-09-03
JPS6241031B2 (en) * 1979-01-05 1987-09-01 Medtronic Inc
JPS5755426B2 (en) * 1979-02-08 1982-11-24

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3334546A1 (en) * 1982-09-24 1984-03-29 Viridian Inc Fuehrungssonde for a hose means for passing and suction of fluid in and out of the gastrointestinal tract of a patient
US4677990A (en) * 1985-02-28 1987-07-07 Siemens Aktiengesellschaft Endocardial electrode controllable to form selected contours
FR2583985A1 (en) * 1985-06-27 1987-01-02 Nivarox Sa Stylet for electrode implantable in the body
EP0207438A1 (en) * 1985-06-27 1987-01-07 Nivarox-FAR S.A. Stylet for an implantable electrode
US4791939A (en) * 1985-06-27 1988-12-20 Nivarox-Far S.A. Stylet for use with an implantable pacing lead
US5160325A (en) * 1986-10-06 1992-11-03 C. R. Bard, Inc. Catheter with novel lumens shapes
WO1992001436A1 (en) * 1990-07-19 1992-02-06 Sherwood Medical Company Improved enteral feeding tube
US5242389A (en) * 1990-07-19 1993-09-07 Sherwood Medical Company Enteral feeding tube enteral feeding tube with separate stylet lumen
EP0648473A1 (en) * 1993-10-18 1995-04-19 Ethicon, Inc. Blunt point needles
DE10017147C2 (en) * 2000-04-03 2003-06-12 Wolfram Voelker Washable guidewire for a catheter
DE10017147A1 (en) * 2000-04-03 2001-10-18 Wolfram Voelker Guide wire to be used for balloon angioplasty, comprising outer cover accommodating movable inner wire
EP1652548A1 (en) * 2004-11-01 2006-05-03 Terumo Kabushiki Kaisha Medical guide wire
US7942832B2 (en) 2004-11-01 2011-05-17 Terumo Kabushiki Kaisha Medical guide wire
US10531892B2 (en) 2013-03-13 2020-01-14 Smith & Nephew, Inc. Surgical needle
US9895165B2 (en) 2013-03-15 2018-02-20 Smith & Nephew, Inc. Surgical needle
CN106999182A (en) * 2014-10-15 2017-08-01 史密夫和内修有限公司 Anchoring piece/implant configuration device and relative method of tissue repair
US10499903B2 (en) 2014-10-15 2019-12-10 Smith & Nephew, Inc. Anchor/implant deployment device and tissue repair methods related thereto
US10499904B2 (en) 2015-02-17 2019-12-10 Smith & Nephew, Inc. Anchor insertion system and method of use thereof

Also Published As

Publication number Publication date
FR2471790B3 (en) 1981-10-16
CA1150580A (en) 1983-07-26
JPS617684Y2 (en) 1986-03-10
FR2471790A3 (en) 1981-06-26
NL8006752A (en) 1981-07-16
JPS56101305U (en) 1981-08-10
DE3046691A1 (en) 1981-09-10
GB2064963B (en) 1984-06-13
CA1150580A1 (en)

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931212