U.S. patent number 3,805,301 [Application Number 05/275,996] was granted by the patent office on 1974-04-23 for tubular grafts having indicia thereon.
This patent grant is currently assigned to Meadox Medicals, Inc.. Invention is credited to William J. Liebig.
United States Patent |
3,805,301 |
Liebig |
April 23, 1974 |
TUBULAR GRAFTS HAVING INDICIA THEREON
Abstract
Tubular grafts such as vascular grafts which are used in the
human body. The graft includes an elongated flexible tubular body
having thereon, at its exterior, an elongated line which is visibly
distinct from the remainder of the tubular body as by being of a
color different from the remainder of the tubular body. This line
is situated in such a way that when the graft is used it can
readily be angularly oriented about its longitudinal axis so that
the graft will not be implanted in a twisted condition, for
example, and at the same time the line may also serve for
identification purposes as by forming part of a code system which
enables the particular graft be identified by the particular nature
of the line, such as the color thereof.
Inventors: |
Liebig; William J. (Franklin
Lakes, NJ) |
Assignee: |
Meadox Medicals, Inc. (Oakland,
NJ)
|
Family
ID: |
23054702 |
Appl.
No.: |
05/275,996 |
Filed: |
July 28, 1972 |
Current U.S.
Class: |
623/1.34; 623/9;
623/1.35 |
Current CPC
Class: |
D04B
21/14 (20130101); A61F 2/06 (20130101); D10B
2509/06 (20130101); A61F 2002/065 (20130101) |
Current International
Class: |
A61F
2/06 (20060101); A61f 001/24 () |
Field of
Search: |
;3/1,DIG.1
;128/334R,348,349R ;138/104,118,123 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
"De Bakey Dacron Prostheses for Surgery," pamphlet by United States
Catheter & Instrument Corp., Glens Falls, N.Y. (1965)..
|
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Frinks; Ronald L.
Attorney, Agent or Firm: Blum, Moscovitz, Friedman &
Kaplan
Claims
What is claimed is:
1. A graft comprising an elongated tubular body made of flexible
material, said tubular body being a warp knit body having warp ends
which extend longitudinally of the tubular body, and one of the
warp ends having a color different from the remainder of the warp
ends to form at least one longitudinally extending line visibly
distinct from the remainder of the tubular body for accurately
orienting the tubular body angularly with respect to its
longitudinal axis.
2. The combination of claim 1 and wherein said body has a main
elongated tubular portion and a pair of subsidiary elongated
tubular portions branching from said main tubular portion and
providing the body with a substantially Y-shaped configuration,
said line extending longitudinally along each of said subsidiary
tubular portions and along said main tubular portion.
3. The combination of claim 2 and wherein there are two lines
formed by a pair of warp ends both of which have a c0lor different
from the remainder of the warp ends, the latter warp ends extending
without interruption along the subsidiary tubular portions and
parallel to each other along the main tubular portion.
4. The combination of claim 2 and wherein the line includes a pair
of portions extending along the subsidiary tubular portion and a
third portion extending along the main portion longitudinally
thereof from the intersection between the pair of subsidiary
tubular portions.
Description
BACKGROUND OF THE INVENTION
The present invention relates to grafts.
In particular, the present invention relates to tubular grafts of
the type which are used in the human body, for example, for
repairing tubular parts such arteries and the like. These vascular
grafts are generally made of a fabric such as polyester fabrics,
e.g., Dacron and must be very carefully implanted so as to repair a
damaged tubular part of the body. However, one of the problems
encountered with vascular grafts of this type is that due to the
flexible nature of the tubular graft as well as due to the fact
that it is composed of yarns which are knitted or woven, the graft
cannot always be introduced precisely with the proper angular
orientation and creates problems when it is introduced in an
angularly twisted condition or in a condition where it is not
angularly oriented properly with respect to its longitudinal
axis.
A further problem encountered with grafts of this type is that
there are several different types of grafts which are available to
be used for different purposes, and is not always possible to
identify readily the particular graft which is required for a
particular purpose.
SUMMARY OF THE INVENTION
It is accordingly a primary object of the present invention to
provide a tubular graft which will avoid the above drawbacks.
In particular, it is an object of the invention to provide a
tubular graft wth a structure which will enable it to be angularly
oriented with respect to its longitudinal axis in a highly precise
manner when the graft is implanted.
Also, it is an object of the invention to provide a tubular graft
of this type which can be readily identified.
Furthermore, it is an object of the invention to provide a warp
knit vascular graft product which has the above features and in
which these features are incorporated without changing the
structure of the tubular graft.
According to the invention the graft includes an elongated flexible
tubular body which has at its exterior a longitudinally extending
line which is visibly distinct from the remainder of the tubular
body so that by the use of this line it is possible when the graft
is implanted to angularly orient the tubular graft with respect to
its longitudinal axis in a highly precise manner.
BIREF DESCRIPTION OF DRAWINGS
The invention is illustrated by way of example in the accompanying
drawings which form part of this application and in which:
FIG. 1 is a perspective illustration of one embodiment of a
vascular graft according to the invention shown in its flattened
condition;
FIG. 2 shows the structure of FIG. 1 on a smaller scale but in the
condition it assumes when it is used;
FIG. 3 is a fragmentary illustration of the yarns which are warp
knit to form the article of FIGS. 1 and 2 with FIG. 3 showing one
of the yarns which has a color different from the remainder of the
yarns; and
FIG. 4 shows a tubular graft provided with another embodiment of a
marking line.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to FIG. 1, there is shown therein a tubular graft 10
which has the features of the present invention. The particular
vascular graft 10 shown in FIG. 1 is a warp knit vascular graft
product and is shown because the present invention is particularly
suited for this type of product. The tubular graft 10 has a main
tubular portion 12 and a pair of subsidiary tubular portions 14a
and 14b respectively branching from the main tubular portion 12 so
that the tubular graft 10 has a substantially Y-shaped
configuration, particularly when it is used as shown in FIG. 2. In
other words before the tubular graft is used it has the flattened
condition shown in FIG. 1, whereas when it is implanted it has the
tubular condition shown in FIG. 2. Such grafts may be made of a
yarn such as Dacron which is warp knitted in the particular example
illustrated. In any warp knit tubular graft it is possible to
utilize warp ends for the purposes of the present invention.
Thus, as is shown in FIG. 1, a pair of elongated lines 16a and 16b
extend longitudinally of the tubular graft 10, parallel to the
longitudinal axis thereof. When the graft is used and assumes the
condition shown in FIG. 2, these lines 16a and 16b, which are
visibly distinct from the remainder of the tubular graft 10, enable
the tubular graft to be angularly oriented in a highly precise
manner with respect to its longitudinal axis. As a result the graft
is not implanted in a twisted condition. For example with the
particular product shown in FIGS. 1 and 2 the graft when implanted
will have the pair of branches 14a and 14b properly aligned
angularly with respect to the main branch 12. Thus, it is possible
to avoid with the use of the lines 16a and 16b twisting of one or
the other or both of the branches 14a and 14b with respect to the
main tubular portion 12. Thus the subsidiary tubular portions 14a
and 14b will be properly aligned angularly with respect to the main
tubular portion 12, and the entire graft will be properly oriented
angularly with respect to the tubular part of the body to which it
is attached.
The manner in which the fabric of the tubular graft 10 is knitted
is illustrated in detail in FIG. 3. Thus, FIG. 3 shows a section 18
of the fabric used in the product 10. This fabric is a
conventionally warp knit tube. The present invention lends itself
in particular to this type of fabric because it is a simple matter
to introduce into the fabric a warp end, such as the warp end 20
shown in FIG. 3, which is visibly distinct from the remainder of
the yarns, as by having a color different from the remainder of the
yarns, so that in this simple way the tubular product 10 has part
of its basic structure a longitudinally extending line which can be
used both for angular orientation as well as for identification. In
other words there are different types of grafts which are commonly
used such as the Cooley graft, or other types of known grafts, and
by utilizing a suitable coded color system, it is possible to
choose for the lines 16a and 16b formed by the yarns 20 a color
which will identify the type of tubular graft and which will serve
the additional function of providing for the proper angular
orientation.
However, it is to be understood that the invention is not limited
to identifying and orienting lines which are woven or knit directly
into the fabric which forms the tubular graft. For example FIG. 4
shows a tubular graft 22 which may be circularly knit, for example.
With such a product it is not possible to have longitudinally
extending yarns such as the warp ends of the product of FIGS. 1-3.
Thus with the embodiment of FIG. 4 the elongated lines 24a, 24b,
and 24c may be marked directly on the exterior surface of the
tubular graft 22 with a suitable instrument such as a suitable pen.
In this case also it will be noted that the lines 24a and 24b
extend along the pair of subsidiary branches 26a and 26b. However
only a single line 24c is required to extend along the main tubular
portion 28. In this case since the lines 24a-24c are directly
marked on the tubular graft, only a single line 24c is required at
the main tubular portion 28, with this line extending
longitudinally along the main tubular portion 28, parallel to the
axis thereof, from the intersection between the pair of subsidiary
branches 26a and 26b.
It is thus apparent that with the above structure of the invention
a tubular graft is provided which can readily be oriented angularly
when it is used and which also can be easily identified, and these
results are achieved without changing the basic nature of the
tubular graft itself so that the invention lends itself readily to
use with conventional tubular grafts.
* * * * *