CA2056919A1 - Guide wire introducer - Google Patents
Guide wire introducerInfo
- Publication number
- CA2056919A1 CA2056919A1 CA 2056919 CA2056919A CA2056919A1 CA 2056919 A1 CA2056919 A1 CA 2056919A1 CA 2056919 CA2056919 CA 2056919 CA 2056919 A CA2056919 A CA 2056919A CA 2056919 A1 CA2056919 A1 CA 2056919A1
- Authority
- CA
- Canada
- Prior art keywords
- sheath
- guide wire
- needle
- lumen
- introducer
- 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.)
- Withdrawn
Links
Abstract
ABSTRACT OF THE DISCLOSURE
In one of its aspects the invention provides a guide wire introducer for use in leading a flexible guide wire into a hollow needle positioned to lead the guide wire into a blood vessel, the introducer comprising an elongate tubular sheath having a wall defining a lumen, and a tip attached to the sheath at one end of the sheath. The tip combines with the lumen to contain the guide wire loosely for movement through the lumen and tip. An opening is formed in the wall of the sheath to expose the wire and the opening is proportioned to permit a user to engage the wire with a finger to slide the wire along the lumen.
In one of its aspects the invention provides a guide wire introducer for use in leading a flexible guide wire into a hollow needle positioned to lead the guide wire into a blood vessel, the introducer comprising an elongate tubular sheath having a wall defining a lumen, and a tip attached to the sheath at one end of the sheath. The tip combines with the lumen to contain the guide wire loosely for movement through the lumen and tip. An opening is formed in the wall of the sheath to expose the wire and the opening is proportioned to permit a user to engage the wire with a finger to slide the wire along the lumen.
Description
20~69~9 This invention relates to the introduction of a guide wire used in venous catheterization, and more particularly to an introducer for containing and advancing a J-shaped flexible guide wire into a hollow needle and hence into a blood vessel.
In some surgical procedures an intermediate step is the introduction of a guide wire for subsequent use in guiding a catheter into position in a blood vessel. The procedure normally starts by using a hollow needle to penetrate body tissue and to make an entry into the blood vessel. A guide wire is then engaged down the needle into the blood vessel before withdrawing the needle and making use of the guide wire for subsequent dilation of tissue and engagement of the catheter.
The guide wire is of course extremely flexible but in its natural relaxed state it can have an end part which is J-shaped to permit manipulation of the wire in the blood vessel to pass branches and irregularities in the blood vessel. As a result it is desirable to have some form of introducer to enter the wire into the needle.
It is an object of the present invention to provide such an introducer and to make it in a very simple and efficient form to permit engaging a guide wire into a needle.
Accordingly, in one of its aspects the invention provides a guide wire introducer for use in leading a flexible guide wire into a hollow needle positioned to lead the guide wire into a blood vessel, the introducer comprising an elongate tubular sheath having a wall defining a lumen, and a tip attached to the sheath at one end of the sheath. The tip combines with the lumen to contain the guide wire loosely for movement through the lumen and tip. An opening is formed in the wall of the sheath to expose the wire and the opening is proportioned to permit a user to engage the wire with a finger to slide the wire along the lumen.
This and other aspects of the invention will be better understood with reference to the drawings in which:
Fig. 1 is an isometric view, with portions broken away, showing a preferred embodiment of introducer according to the invention and containing a J-shaped flexible guide wire;
Fig. 2 is a sectional view on line 2-2 of Fig. 1 and drawn to a larger scale;
Fig. 3 is a side view of a part of the introducer with a guide wire positioned ready to be introduced into a conventional needle; and Fig. 4 is a side view (to a scale larger than that used in Fig. 3) with part in section to show an alternative embodiment of the invention.
Reference is first made to Fig. 1 which illustrates an introducer designated generally by the numeral 20 and consisting of an elongate main part 21 in the form of a tubular sheath and containing a guide wire 22 having a J-shaped leading end 24.
The guide wire is a loose fit in the introducer which has a tapered tip 26 for combining with a needle (as will be explained), and a similar tip 27 at the other end so that the introducer can be used from either end. The cross-section of the introducer is interrupted by an elongate opening 28 which permits manual manipulation of the wire in the introducer as will be explained.
20~69~9 Reference is next made to Fig. 2 which illustrates a cross-section of the main body of the introducer. AS can be seen in this figure, the cross-section is circular and contains a lumen 30 which is offset with respect to the longitudinal axis of the circular cross-section of the introducer. In the preferred embodiment shown in Fig. 2, the lumen is generally D-shaped in cross-section having an interior surface including a platform 32. The outer surface of the introducer can be considered to be in two parts. A first part is at the top of the cross-section as drawn in Fig. 2 and a second part at the bottom. A wall or surface 34 of the lumen 30 is parallel to the outer surface at the first part of the introducer and the platform 32 is adjacent the second part.
The cross-section can also be considered in terms of the thickness of the wall surrounding the lumen 30. As drawn in Fig. 2 a thin part of the wall is at the top of the cross-section and a thicker part (i.e. below the platform 32) is diametrically opposite the thin part.
The lumen 30 is proportioned to contain the guide wire 22 loosely so that it will move with minimal friction through the introducer. As can be seen in Fig. 2, the opening 28 provides ready access for a user to engage the wire 22 using finger and thumb about the introducer, and to slide the wire in the introducer along the elongate opening 28.
Reference is next made to Fig. 3 where it can be seen in broken outline that the tip has a leg 35 engaged in the lumen 30. The leg fits snugly in the lumen and is engaged with the platform 32.
20~6~
In use, the wire 22 would be moved into the introducer until the J-shaped end is essentially contained within the introducer and its tip 26 as indicated in Fig. 3. The double ended arrow 36 illustrates the directions of movement available to the user by manipulating the wire in the introducer. Once the wire is in the position shown in Fig. 3, the tapered tip 26 can be engaged in a matching recess in the needle 35 (not shown but conventional) for locating the introducer while the wire is moved into the needle. With the introducer and needle engaged in this manner, the user can then push the wire along the introducer by engagement in the opening 28 and thereby move the wire right throuyh the needle and into a blood vessel. Once the wire is in position the introducer can be removed off the wire and the procedure continued in conventional manner.
Returning to Fig. 2, it will be appreciated that the opening 28 has a tendency to weaken the introducer significantly and it is for this reason that the thicker part of the cross-section below platform 32 is provided. This provides sufficient rigidity to maintain the shape of the introducer regardless of the fact that part of it has been cut away to define the opening 28. Clearly other cross-sections could be used to achieve the same result and these are within the scope of the invention as claimed.
The material of the main part 21 of the introducer is preferably polyethylene with the tips moulded to fit onto the introducer from any suitable material such as nylon. Adhesives are used if necessary.
The length of the introducer and its cross-sectional 205691~
shape wiil depend on the size of the guide wire to be used and the length of the guide wire being introduced. It is also possible to deform the thermoplastic polyethylene of the main part 21 to form tips instead of adding moulded tips.
Reference is next made to Fig. 4 where an alternative embodiment of introducer is illustrated. Here a sheath 38 is circular in cross-section both inside and outside and a tip 40 is provided having a cylindrical extension 42 engaged in the sheath and a leg 44 extending from the extension 42. The leg defines a platform 46 so that a section of Fig. 4 taken at a position equivalent to section 2-2 of Fig. 1 will provide a similar shape to that shown in Fig. 2 with the platform formed by the leg 44.
Variations such as that shown in Fig. 4 are within the scope of the invention as claimed.
In some surgical procedures an intermediate step is the introduction of a guide wire for subsequent use in guiding a catheter into position in a blood vessel. The procedure normally starts by using a hollow needle to penetrate body tissue and to make an entry into the blood vessel. A guide wire is then engaged down the needle into the blood vessel before withdrawing the needle and making use of the guide wire for subsequent dilation of tissue and engagement of the catheter.
The guide wire is of course extremely flexible but in its natural relaxed state it can have an end part which is J-shaped to permit manipulation of the wire in the blood vessel to pass branches and irregularities in the blood vessel. As a result it is desirable to have some form of introducer to enter the wire into the needle.
It is an object of the present invention to provide such an introducer and to make it in a very simple and efficient form to permit engaging a guide wire into a needle.
Accordingly, in one of its aspects the invention provides a guide wire introducer for use in leading a flexible guide wire into a hollow needle positioned to lead the guide wire into a blood vessel, the introducer comprising an elongate tubular sheath having a wall defining a lumen, and a tip attached to the sheath at one end of the sheath. The tip combines with the lumen to contain the guide wire loosely for movement through the lumen and tip. An opening is formed in the wall of the sheath to expose the wire and the opening is proportioned to permit a user to engage the wire with a finger to slide the wire along the lumen.
This and other aspects of the invention will be better understood with reference to the drawings in which:
Fig. 1 is an isometric view, with portions broken away, showing a preferred embodiment of introducer according to the invention and containing a J-shaped flexible guide wire;
Fig. 2 is a sectional view on line 2-2 of Fig. 1 and drawn to a larger scale;
Fig. 3 is a side view of a part of the introducer with a guide wire positioned ready to be introduced into a conventional needle; and Fig. 4 is a side view (to a scale larger than that used in Fig. 3) with part in section to show an alternative embodiment of the invention.
Reference is first made to Fig. 1 which illustrates an introducer designated generally by the numeral 20 and consisting of an elongate main part 21 in the form of a tubular sheath and containing a guide wire 22 having a J-shaped leading end 24.
The guide wire is a loose fit in the introducer which has a tapered tip 26 for combining with a needle (as will be explained), and a similar tip 27 at the other end so that the introducer can be used from either end. The cross-section of the introducer is interrupted by an elongate opening 28 which permits manual manipulation of the wire in the introducer as will be explained.
20~69~9 Reference is next made to Fig. 2 which illustrates a cross-section of the main body of the introducer. AS can be seen in this figure, the cross-section is circular and contains a lumen 30 which is offset with respect to the longitudinal axis of the circular cross-section of the introducer. In the preferred embodiment shown in Fig. 2, the lumen is generally D-shaped in cross-section having an interior surface including a platform 32. The outer surface of the introducer can be considered to be in two parts. A first part is at the top of the cross-section as drawn in Fig. 2 and a second part at the bottom. A wall or surface 34 of the lumen 30 is parallel to the outer surface at the first part of the introducer and the platform 32 is adjacent the second part.
The cross-section can also be considered in terms of the thickness of the wall surrounding the lumen 30. As drawn in Fig. 2 a thin part of the wall is at the top of the cross-section and a thicker part (i.e. below the platform 32) is diametrically opposite the thin part.
The lumen 30 is proportioned to contain the guide wire 22 loosely so that it will move with minimal friction through the introducer. As can be seen in Fig. 2, the opening 28 provides ready access for a user to engage the wire 22 using finger and thumb about the introducer, and to slide the wire in the introducer along the elongate opening 28.
Reference is next made to Fig. 3 where it can be seen in broken outline that the tip has a leg 35 engaged in the lumen 30. The leg fits snugly in the lumen and is engaged with the platform 32.
20~6~
In use, the wire 22 would be moved into the introducer until the J-shaped end is essentially contained within the introducer and its tip 26 as indicated in Fig. 3. The double ended arrow 36 illustrates the directions of movement available to the user by manipulating the wire in the introducer. Once the wire is in the position shown in Fig. 3, the tapered tip 26 can be engaged in a matching recess in the needle 35 (not shown but conventional) for locating the introducer while the wire is moved into the needle. With the introducer and needle engaged in this manner, the user can then push the wire along the introducer by engagement in the opening 28 and thereby move the wire right throuyh the needle and into a blood vessel. Once the wire is in position the introducer can be removed off the wire and the procedure continued in conventional manner.
Returning to Fig. 2, it will be appreciated that the opening 28 has a tendency to weaken the introducer significantly and it is for this reason that the thicker part of the cross-section below platform 32 is provided. This provides sufficient rigidity to maintain the shape of the introducer regardless of the fact that part of it has been cut away to define the opening 28. Clearly other cross-sections could be used to achieve the same result and these are within the scope of the invention as claimed.
The material of the main part 21 of the introducer is preferably polyethylene with the tips moulded to fit onto the introducer from any suitable material such as nylon. Adhesives are used if necessary.
The length of the introducer and its cross-sectional 205691~
shape wiil depend on the size of the guide wire to be used and the length of the guide wire being introduced. It is also possible to deform the thermoplastic polyethylene of the main part 21 to form tips instead of adding moulded tips.
Reference is next made to Fig. 4 where an alternative embodiment of introducer is illustrated. Here a sheath 38 is circular in cross-section both inside and outside and a tip 40 is provided having a cylindrical extension 42 engaged in the sheath and a leg 44 extending from the extension 42. The leg defines a platform 46 so that a section of Fig. 4 taken at a position equivalent to section 2-2 of Fig. 1 will provide a similar shape to that shown in Fig. 2 with the platform formed by the leg 44.
Variations such as that shown in Fig. 4 are within the scope of the invention as claimed.
Claims (9)
1. A guide wire introducer for use in leading a flexible guide wire into a hollow needle positioned to lead the guide wire into a blood vessel, the introducer comprising:
a tubular sheath having an outer surface and extending about a longitudinal axis, the sheath defining a longitudinally extending lumen bordered by a platform and an inner surface extending generally parallel to an adjacent first part of the outer surface, a major part of the cross-sectional area of the material of the tubular sheath being contained between the platform and an adjacent second part of the outer surface; and an access opening in the sheath at a location in said first part of the outer surface to expose the platform so that when a guide wire is inserted in the lumen, the wire rests on the platform and is available to be moved longitudinally using a thumb in the opening while gripping the sheath with the fingers whereby the guide wire can be moved through the introducer, through the needle, and into a selected position in the blood vessel.
a tubular sheath having an outer surface and extending about a longitudinal axis, the sheath defining a longitudinally extending lumen bordered by a platform and an inner surface extending generally parallel to an adjacent first part of the outer surface, a major part of the cross-sectional area of the material of the tubular sheath being contained between the platform and an adjacent second part of the outer surface; and an access opening in the sheath at a location in said first part of the outer surface to expose the platform so that when a guide wire is inserted in the lumen, the wire rests on the platform and is available to be moved longitudinally using a thumb in the opening while gripping the sheath with the fingers whereby the guide wire can be moved through the introducer, through the needle, and into a selected position in the blood vessel.
2. A combination of a guide wire introducer and a hollow needle for leading a guide wire into a blood vessel, the combination comprising:
a hollow needle for insertion into a blood vessel, the needle having a proximal end and a sharpened distal end a tubular sheath having an outer surface and extending between proximal and distal ends about a longitudinal axis, the sheath defining a longitudinally extending lumen bordered by a platform and an inner surface extending generally parallel to an adjacent first part of the outer surface, a major part of the cross-sectional area of the material of the tubular sheath being contained between the platform and an adjacent second part of the outer surface;
an access opening defined in the sheath at a location in said first part of the outer surface to expose the platform so that when a guide wire is inserted in the lumen, the wire rests on the platform and is available to be moved longitudinally using a thumb in the opening while gripping the sheath with the fingers; and the needle and sheath cooperating at the respective proximal and distal ends to define location means for positioning the sheath with the needle so that the guide wire will pass directly from the sheath into the needle and thence, in use, into a blood vessel for positioning at a selected location in the blood vessel.
a hollow needle for insertion into a blood vessel, the needle having a proximal end and a sharpened distal end a tubular sheath having an outer surface and extending between proximal and distal ends about a longitudinal axis, the sheath defining a longitudinally extending lumen bordered by a platform and an inner surface extending generally parallel to an adjacent first part of the outer surface, a major part of the cross-sectional area of the material of the tubular sheath being contained between the platform and an adjacent second part of the outer surface;
an access opening defined in the sheath at a location in said first part of the outer surface to expose the platform so that when a guide wire is inserted in the lumen, the wire rests on the platform and is available to be moved longitudinally using a thumb in the opening while gripping the sheath with the fingers; and the needle and sheath cooperating at the respective proximal and distal ends to define location means for positioning the sheath with the needle so that the guide wire will pass directly from the sheath into the needle and thence, in use, into a blood vessel for positioning at a selected location in the blood vessel.
3. A guide wire introducer for use in leading a flexible guide wire into a hollow needle positioned to lead the wire into a blood vessel, the introducer comprising:
a tubular sheath having a longitudinal axis and defining a lumen with respect to said axis such that in cross-section the wall of the tubular sheath is thin at a first location and thicker at a second location diametrically spaced from the first location;
a tip coupled to the sheath and adapted to combine with the needle to locate the sheath as the wire is fed into the needle;
an opening defined by the sheath in said first location and positioned adjacent the tip and exposing the lumen to provide access for manually moving the wire axially along the lumen to feed the wire into the needle.
a tubular sheath having a longitudinal axis and defining a lumen with respect to said axis such that in cross-section the wall of the tubular sheath is thin at a first location and thicker at a second location diametrically spaced from the first location;
a tip coupled to the sheath and adapted to combine with the needle to locate the sheath as the wire is fed into the needle;
an opening defined by the sheath in said first location and positioned adjacent the tip and exposing the lumen to provide access for manually moving the wire axially along the lumen to feed the wire into the needle.
4. An introducer as claimed in claim 3 in which the lumen is defined in part by a platform positioned at a side of the lumen nearest said second location.
5. An introducer as claimed in claim 3 in which the tip is tapered.
6. A guide wire introducer for use in leading a flexible guide wire into a hollow needle positioned to lead the guide wire into a blood vessel, the introducer comprising:
a tubular sheath having an outer surface and extending about a longitudinal axis, the sheath defining a longitudinally extending lumen; and an access opening in the sheath to expose the lumen so that when a guide wire is inserted in the lumen, the wire is available to be moved longitudinally using a thumb while gripping the sheath with the fingers whereby the guide wire can be moved through the introducer, through the needle, and into a selected position in the blood vessel.
a tubular sheath having an outer surface and extending about a longitudinal axis, the sheath defining a longitudinally extending lumen; and an access opening in the sheath to expose the lumen so that when a guide wire is inserted in the lumen, the wire is available to be moved longitudinally using a thumb while gripping the sheath with the fingers whereby the guide wire can be moved through the introducer, through the needle, and into a selected position in the blood vessel.
7. A combination of a guide wire introducer and a hollow needle for leading a guide wire into a blood vessel, the combination comprising:
a hollow needle for insertion into a blood vessel, the needle having a proximal end and a sharpened distal end;
a tubular sheath having an outer surface and extending between proximal and distal ends about a longitudinal axis, the sheath defining a longitudinally extending lumen;
an access opening defined in the sheath to expose the lumen so that when a guide wire is inserted in the lumen, the wire is available to be moved longitudinally using a thumb while gripping the sheath with the fingers; and the needle and sheath cooperating at the respective proximal and distal ends to define location means to position the sheath with the needle so that the guide wire will pass directly from the sheath into the needle and thence, in use, into a blood vessel for positioning at a selected location in the blood vessel.
a hollow needle for insertion into a blood vessel, the needle having a proximal end and a sharpened distal end;
a tubular sheath having an outer surface and extending between proximal and distal ends about a longitudinal axis, the sheath defining a longitudinally extending lumen;
an access opening defined in the sheath to expose the lumen so that when a guide wire is inserted in the lumen, the wire is available to be moved longitudinally using a thumb while gripping the sheath with the fingers; and the needle and sheath cooperating at the respective proximal and distal ends to define location means to position the sheath with the needle so that the guide wire will pass directly from the sheath into the needle and thence, in use, into a blood vessel for positioning at a selected location in the blood vessel.
8. A guide wire introducer for use in leading a flexible guide wire into a hollow needle positioned to lead the guide wire into a blood vessel, the introducer comprising:
a tubular sheath having an outer surface and extending about a longitudinal axis, the sheath defining a longitudinally extending lumen;
a tip at an end of the sheath and having a leg extending inside the sheath, the leg defining a platform inside the sheath; and an access opening in the sheath to expose the platform so that when a guide wire is inserted in the lumen, the wire rests on the platform and is available to be moved longitudinally using a thumb in the opening while gripping the sheath with the fingers, whereby the guide wire can be moved through the introducer, through the needle, and into a selected position in the blood vessel.
a tubular sheath having an outer surface and extending about a longitudinal axis, the sheath defining a longitudinally extending lumen;
a tip at an end of the sheath and having a leg extending inside the sheath, the leg defining a platform inside the sheath; and an access opening in the sheath to expose the platform so that when a guide wire is inserted in the lumen, the wire rests on the platform and is available to be moved longitudinally using a thumb in the opening while gripping the sheath with the fingers, whereby the guide wire can be moved through the introducer, through the needle, and into a selected position in the blood vessel.
9. A combination of a guide wire introducer and a hollow needle for leading a guide wire into a blood vessel, the combination comprising:
a hollow needle for insertion into a blood vessel, the needle having a proximal end and a sharpened distal end;
a tubular sheath having an outer surface and extending between proximal and distal ends about a longitudinal axis, the sheath defining a longitudinally extending lumen;
a tip at an end of the sheath and having a leg extending inside the sheath, the leg defining a platform inside the sheath; and an access opening defined in the sheath to expose the platform so that when a guide wire is inserted in the lumen, the wire rests on the platform and is available to be moved longitudinally using a thumb in the opening while gripping the sheath with the fingers; and the needle and tip cooperating at the respective proximal and distal ends to define location means to position the sheath with the needle so that the guide wire will pass directly from the sheath into the needle and thence, in use, into a blood vessel for positioning at a selected location in the blood vessel.
a hollow needle for insertion into a blood vessel, the needle having a proximal end and a sharpened distal end;
a tubular sheath having an outer surface and extending between proximal and distal ends about a longitudinal axis, the sheath defining a longitudinally extending lumen;
a tip at an end of the sheath and having a leg extending inside the sheath, the leg defining a platform inside the sheath; and an access opening defined in the sheath to expose the platform so that when a guide wire is inserted in the lumen, the wire rests on the platform and is available to be moved longitudinally using a thumb in the opening while gripping the sheath with the fingers; and the needle and tip cooperating at the respective proximal and distal ends to define location means to position the sheath with the needle so that the guide wire will pass directly from the sheath into the needle and thence, in use, into a blood vessel for positioning at a selected location in the blood vessel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2056919 CA2056919A1 (en) | 1991-12-04 | 1991-12-04 | Guide wire introducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2056919 CA2056919A1 (en) | 1991-12-04 | 1991-12-04 | Guide wire introducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2056919A1 true CA2056919A1 (en) | 1993-06-05 |
Family
ID=4148863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2056919 Withdrawn CA2056919A1 (en) | 1991-12-04 | 1991-12-04 | Guide wire introducer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2056919A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5507300A (en) * | 1993-10-06 | 1996-04-16 | Sherwood Medical Company | Guide wire feeding device |
-
1991
- 1991-12-04 CA CA 2056919 patent/CA2056919A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5507300A (en) * | 1993-10-06 | 1996-04-16 | Sherwood Medical Company | Guide wire feeding device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| AZWI | Withdrawn application |