U.S. patent number 3,875,938 [Application Number 05/390,542] was granted by the patent office on 1975-04-08 for multi-mode cannulating apparatus.
Invention is credited to Eli K. Mellor.
United States Patent |
3,875,938 |
Mellor |
April 8, 1975 |
Multi-mode cannulating apparatus
Abstract
Multiple mode cannulating apparatus wherein a blood vessel
puncturing rod is removable from a tubular body having a forward
stem penetrating the vessel, the body having a rearward extension
allowing pinch-off between the time that the rod is removed and
auxiliary tubing is coupled to the extension.
Inventors: |
Mellor; Eli K. (Burbank,
CA) |
Family
ID: |
23542892 |
Appl.
No.: |
05/390,542 |
Filed: |
August 22, 1973 |
Current U.S.
Class: |
604/167.01 |
Current CPC
Class: |
A61M
5/1582 (20130101); A61M 25/0606 (20130101); A61M
2025/0266 (20130101) |
Current International
Class: |
A61M
25/06 (20060101); A61M 5/158 (20060101); A61M
5/14 (20060101); A61m 005/14 () |
Field of
Search: |
;128/214.4,221,DIG.16,348 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Truluck; Dalton L.
Attorney, Agent or Firm: Haefliger; William W.
Claims
I claim:
1. In multiple mode, cannulating apparatus, the combination
comprising
a. an axially extending tubular body defining a blood flow passage
and having a forward stem portion insertible into a blood vessel,
the body having a side port for conducting blood flowing between
said passage and first auxiliary tubing, the body also having a
rear port in alignment with said axis,
b. a rearward tubular extension on the body and extending axially
rearwardly from said rear port, said extension characterized as
having pinch-off flexibility,
c. a rearwardly removable rod extending axially within said passage
and generally coaxially completely through said extension, the rod
having a vessel puncturing tip,
d. sealing means sealing off between the rod and extension and
removable off the extension when the rod is removed from said body,
thereby to accommodate coupling of other auxiliary, flexible, blood
flow tubing with said extension, and
e. a pusher carrying the rod at the rear of said tubular extension,
the pusher being rearwardly elongated and having a rearwardly
extending bore, and a tubular adapter part removably received into
said bore and extending rearwardly therefrom.
2. The combination of claim 1 wherein said sealing means comprises
an elastomer plug at least partially inserted into the tubular
extension at the rear thereof, the rod extending through the
plug.
3. The combination of claim 1 wherein said adapter part is sized
for telescopic connection with the tubular extension after removal
of the rod therefrom.
4. The combination of claim 1 wherein said forward stem portion is
flexible, and contains a terminal port at the stem forward end and
lateral side ports in closely rearwardly spaced relation to said
terminal port.
5. The combination of claim 1 including flexible wings connected
with and projecting sidwardly from said body.
6. In multiple mode, cannulating apparatus, the combination
comprising:
a. an axially extending tubular body defining a blood flow passage
and having a forward stem portion insertible into a blood vessel,
the body having a side port connected with first auxiliary tubing
for conducting blood flowing between said passage and said first
auxiliary tubing, the body also having a rear port in alignment
with said axis,
b. a rearward tubular extension on the body and extending axially
rearwardly from said rear port, said extension characterized as
having pinch-off flexibility,
c. an adapter duct having removable telescopic connection with said
rearward tubular extension, and other auxiliary, flexible, blood
flow tubing coupled with said adapter duct,
d. means for circulating blood to and from said passage via said
side and rear ports and said first and other auxiliary tubing,
and
e. flexible wings integral with the bottom surface of said body and
projecting sidewardly therefrom for seating on the skin of a
patient, the wings being capable of being flexed into side-by-side
relation so as to be gripped for advancing or retracting the body
endwise.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to apparatus for use with
extra-corporeal blood passing equipment, and more particularly
concerns the control of blood flow in both withdrawal and return
directions between a single blood vessel cannula and the
equipment.
There is need for rapidly installable and efficiently operable
apparatus controlling the flow of blood between a single cannula at
a patient's vessel such as a vein and the extra-corporeal means
such as dialysis equipment. In this regard, it is highly desirable
that cannulation and dialysis be carried out with minimum
disturbance to the patient, which requires that vein puncturing be
construction, at only one point. Prior apparatus of which I am
aware does not incorporate the unusually advantageous features of
constructon, modes of operation and surprisingly favorable results
afforded by the invention, as will appear.
SUMMARY OF THE INVENTION
Basically, the invention concerns multiple mode, cannulating
apparatus wherein a blood vessel puncturing rod is removable from a
tubular body having a forward stem penetrating the vessel, and
wherein the body has a rearward extension allowing pinch-off
between the time that the rod is removed and auxiliary tubing is
coupled to the extension. Accordingly, blood may then be circulated
from and to the body via that tubing and auxiliary tubing connected
with a body side port, as will be seen. This assures that during
such blood flow treatment, the puncture rod is removed from the
body so as not to inadvertently re-puncture the vessel if the
equipment is caused to be moved on or relative to the patient.
Other objects include the provision of a removable elastomer plug
on the insert, which seals off between the insert and puncture rod;
the provision of an adapter duct to couple the auxiliary tubing to
the flexible extension; and the provision of tabs or wings on the
body to facilitate its use and connection to the skin of a patient,
as will be seen.
These and other objects and advantages of the invention, as well as
the details of an illustrative embodiment, will be more fully
understood from the following description and drawings, in
which:
DRAWING DESCRIPTION
FIG. 1 is an enlarged vertical section taken through a multiple
mode needle embodying the invention;
FIG. 2 is a view like FIG. 1 showing one mode of needle
operation;
FIG. 3 is a view like FIG. 1 showing another mode of needle
operation;
FIG. 4 is a fragmentary view showing a pinch-off configuration,
and
FIG. 5 is a view in vertical section through a body of the type
shown in FIG. 1.
DETAILED DESCRIPTION
The cannulating needle apparatus 10 of FIG. 1 includes an axially
extending tubular body 11 defining a blood flow passage 10a. The
body includes telescopically interfitting and bonded plastic
portions 11a, 11b and 11c, portion 11a comprising a forward
flexible stem or cannula insertible into a blood vessel seen at 12
in FIGS. 2 and 3. Portions 11b and 11c are typically relatively
inflexible.
Stem portion 11a contains porting to pass blood flow to and from
the vessel, and is illustrated for example by a terminal port 13 at
the stem forwardly tapered end 14, and lateral side ports 15 in
rearwardly closely spaced relation to port 13. Four such ports 15
may be provided at about 90.degree. intervals about axis 16,
whereby at least one or more ports will remain in blood passing
open communication with the vessel interior, despite possible
blanking of another port or ports by the vessel wall.
A rearward tubular extension 17 is provided on the body to extend
axially rearwardly from a body rear port 18. Extension 17 may
consist of laterally flexible plastic tubing, allowing pinch-off as
shown in FIG. 4, and for purposes as will appear. Typically, the
forward portion 17a of the extension is telescopically fitted over
the rearward extent of the body portion 11c, as shown.
The body portion 11c also has one side port for conducting blood
flowing between passage 10a and first auxiliary tubing such as is
indicated at 20. For such purpose, that body portion 11c has a
rearwardly and sidewardly angled stub duct 21 defining a side port
22, the tubing 20 telescopically fitted over the stub duct at
23.
In order to insert the stem 11a into the blood vessel 12, it is
first necessary to puncture same. For this purpose a rearwardly
removable rod 24 is provided to extend axially within the passage
10a, and to have a sharp tip 24a. The portion 11a may be flexible,
or inflexible. An enlargement 25 functioning as a handle is
attached to the rear end of the rod and exposed rearwardly of
extension 17, so as to be manually rearwardly retracted. A sealing
elastomer plug 27 serves to transmit force from the pusher to the
extension 17.
The plug 27 comprises one form of means for sealing off between the
rod and extension 17. Further, it is constructed so as to be
manually removable off the extension when the rod is rearwardly
removed from the body, in order to accommodate subsequent coupling
of other auxiliary flexible, blood flow tubing 28 with extension
17, as for example is illustrated in FIG. 3. For this purpose, the
plug 27 may have an annular lip 29 fitting telescopically over the
extension end 30, and an insert 31 fitting into the extension bore
32. The insert 31 has a tight, sliding and sealing fit with rod 24,
to prevent leakage of blood rearwardly from extension 17, when the
vessel is punctured.
Subsequent to such puncturing, the rod 24 is retracted rearwardly.
During or immediately following such removal, the extension is
clamped to pinch-off, as seen in FIG. 4, clamp elements 32
representing manual or mechanical clamping means. Also the plug 27
is then removed. This makes possible the operative attachment of
tubing 28 to the extension rear end portion 30, without undue
leakage of blood. In this regard, such attachment is facilitated by
use of an adpater duct part 34 having a flanged rear end 35 to
which tubing 28 may be attached. Such attachment may be carried out
prior to insertion of the tapered forward end 36 of the duct 34
into the bore 32 of the extension 17, to have a tight sealing fit
therewith. FIG. 4 shows the approach of the duct end 36 toward the
rear end 30 of the extension, for simultaneous insertion of the
duct end and release of the clamp elements 32. The adapter duct 34
may initially be removably carried by the pusher 25, as by
penetration of the tapered end 36 into tight fitting relation with
bore 38 to provide antiseptic protection for end 36.
The numeral 39 in FIG. 3 indicates the provision of extra corporeal
means connected with auxiliary tubing 20 and 28 for circulating
blood to and from the vessel 12 via the passage 10a. Such means may
for example comprise dialysis equipment as described in my
co-pending U.S. Pat. application Ser. No. 244,399, filed Apr. 17,
1972, now abandoned. Numeral 40 in FIG. 1 indicates a protective
length of tubing initially fitting on the body 11, and about stem
11a.
FIG. 5 is a vertical section through a body 50 of the type seen in
FIG. 1, the axis indicated at 50a. Plastic tabs or wings 51 are
integrally formed with the body to be placed upon the skin of a
patient at the time cannulation is to commence. The wings are then
elevated as shown by the broken lines 51a, and retained between the
technician's thumb and first finger 53 and 54, to provide a grip on
the apparatus allowing it to be advanced with the rod or needle tip
24a extended, to achieve cannulation. Thereafter, the wings 51 are
allowed to drop back to the full line positions shown, for suitable
attachment to the patient's skin, holding the equipment in place
during blood treatment.
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