Title: Device in connection with pacers
Abstract: The invention relates to a locking device (1) for a female connector part for cooperation with an elongate, male connector part (30), said female connector part being intended for use in a pacer housing. Said female connector part comprises a longitudinal bore defining a longitudinal space for said locking device. Said locking device comprises one or several tongues (19, 19′) being swingable between two positions, a first position in which the tips of the tongues (19, 19′) can engage said male elongate connector part (30) and a second position in which the tips of the tongues (19, 19′) will not engage the male elongate connector part (30). Said tongues are biased towards said first position by means of a spring force. A pivot (9) is associated with each tongue and each tongue has a first part engaging said connector means (30) and being located on one side of said pivot and a second part being located on the other side of said pivot. Longitudinally acting means (4) are provided to act on said second part of said tongues (19, 19′) for actuating said tongues from said first position against said bias to said second position.
Patent Number: 6,907,292 Issued on 06/14/2005 to Hill
| Inventors:
|
Hill; Rolf (Järfälla, SE)
|
| Assignee:
|
St. Jude Medical AB (SE)
|
| Appl. No.:
|
856888 |
| Filed:
|
November 15, 1999 |
| PCT Filed:
|
November 15, 1999
|
| PCT NO:
|
PCT/SE99/02083
|
| 371 Date:
|
February 5, 2002
|
| 102(e) Date:
|
February 5, 2002
|
| PCT PUB.NO.:
|
WO00/32268 |
| PCT PUB. Date:
|
June 8, 2000 |
Foreign Application Priority Data
| Current U.S. Class: |
607/37; 439/288; 439/909 |
| Intern'l Class: |
A61N 001/37.5 |
| Field of Search: |
607/36,37
439/153,160,261,288,295,341,816,823,864,909
|
References Cited [Referenced By]
U.S. Patent Documents
| 4347849 | Sep., 1982 | Congdon.
| |
| 4784141 | Nov., 1988 | Peers-Travarton.
| |
| 5252090 | Oct., 1993 | Giurtino et al.
| |
| 5489225 | Feb., 1996 | Julian.
| |
| Foreign Patent Documents |
| 0 786 269 | Jul., 1997 | EP.
| |
Primary Examiner: Jastrzab; Jeffrey R.
Attorney, Agent or Firm: Schiff Hardin LLP
Claims
1. An electrical connector arrangement for an implantable medical device, said
arrangement comprising:
a female connector part having a longitudinal bore therein adapted to receive
a male connector part entering said bore in a first longitudinal direction;
a locking plate disposed in said bore having an opening therein and having at
least one tongue formed in said plate projecting into said opening;
a pivot element disposed in said bore;
a longitudinally displaceable element disposed in said bore, said locking plate
being disposed in said bore between said pivot element and said longitudinally
displaceable element; and
said at least one tongue of said locking plate being spring biased to a first
position adapted to engage and lock said male connector part in said bore, and
being moved to a second possession, free of said male connector part, by longitudinal
displacement of said longitudinally displaceable element in said bore in a second
longitudinal direction opposite to said first longitudinal direction, forcing said
at least one tongue against said pivot element.
2. An electrical connector arrangement as claimed in claim 1 wherein said female
connector part comprises a hollow cylindrical element having an end wall with a
central opening therein communicating with said bore.
3. An electrical connector arrangement as claimed in claim 2 wherein said pivot
element is disposed at said end wall adjacent said opening.
4. An electrical connector arrangement as claimed in claim 3 wherein said pivot
element comprises a flange surrounding said opening.
5. An electrical connector arrangement as claimed in claim 3 wherein said pivot
element comprises, for each tongue, a stud disposed at said end wall adjacent said opening.
6. An electrical connector arrangement as claimed in claim 1 wherein said locking
plate comprises a washer having a plurality of tongues projecting into said opening
and defining a spacing in said opening that is smaller than a diameter of said
male connector part.
7. An electrical connector arrangement as claimed in claim 6 comprising two tongues
disposed opposite each other in said opening.
8. An electrical connector arrangement as claimed in claim 6 comprising at least
three tongues symmetrically projecting into said opening.
9. An electrical connector arrangement as claimed in claim 1 wherein said longitudinally
displaceable element comprises a plunger having a central plunger bore therein
adapted to receive said male connector part, said plunger being slidable in said
bore of said female connector part.
10. An electrical connector arrangement as claimed in claim 9 wherein said central
plunger bore has a peripheral edge mechanically acting on a peripheral portion
of said at least one tongue to force said at least one tongue against said pivot element.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a connector for connecting leads to a housing
for an implantable pacer.
2. Description of the Prior Art
A pacer system normally comprises a pulse generator located in a pacer housing,
leads and electrodes at the distal end of the leads. The proximal end of the leads
is connected to the pacer housing by means of a releasable connector. The connector
comprises a female connector part in the pacer housing. The proximal end of the
lead normally is designed as a standardized male connector part and the female
connector part normally is standardized to such an extent that it will receive
this standardized male connector part. The most common way of fixing or locking
the male connector part in the female connector part is to use set screws which
are oriented in an orthogonal direction in relation to the male connector part
and which are accessible from the outside of the pacer housing. The female connector
part normally is located in a header molded on to the housing.
While these setscrews generally have a good fixing effect, the screws are somewhat
difficult to handle, the screws being small. For this reason, attempts have been
made to develop fixing means, which more or less automatically lock the male connector
part upon insertion thereof.
One such device is for instance disclosed in U.S. Pat. No. 5,252,090. This device
includes two elastically resilient metal tongues in a female connector part. The
tongues are situated in a common plane and have a common central line, with a respective
free end, which are located oppositely to each other. The distance between the
two free ends is smaller than the diameter of the male connector part. The tongues
will be deflected into the direction of insertion when the male connector part
is inserted into the female connector part and the tongues thus will engage and
lock the sides of the male connector part. If the male connector part is pulled
outwardly from the female connector part, the locking effect will increase. The
reason is that the friction between the tongues and the male connector part will
draw the tongues in closer contact with the male connector part. The two tongues
are integrally connected to two wings extending through openings in the header.
The wings are angled in relation to the plan of the tongues. Pressure on the wings
will move the tongues out of engagement with the male connector part, which then
can be removed.
In similarity with the design using setscrews, the locking means in the above
design have to be accessed laterally from the outside. For this reason, the locking
means are located in the header in order to avoid openings for manipulation in
the parts of the housing in which the electronic parts of the pacer are located.
Any openings for the connections in the housing or can into the interior of the
housing from the header can be permanently sealed.
Another design of a device for locking the terminal pin of a male connector
plug is disclosed in U.S. Pat. No. 4,784,141. This device is designed for location
in one open end of a bore through a header or through the pacer and is accessible
from that end. The male plug is to be inserted through the opposite end of the
bore. The locking device comprises a hollow cylindrical part with interior threads
and an interior, end flange with a conical interior surface. The locking device
further comprises a plug with a central bore and with external threads fitting
the interior threads in the cylindrical part. The inner open end of the plug is
also provided with a conical surface. A resilient locking ring with conically shaped
sides is located between the respective conical surface on the plug and on the
cylindrical part. When the plug is screwed inwardly into the cylindrical part,
the conical surfaces on plug and cylindrical part will compress the locking ring
inwardly against a connector pin inserted into the locking part. In this way the
pin is locked in the locking device.
SUMMARY OF THE INVENTION
The primary object of the invention is to provide a connector locking part of
the kind described above, which can be used with standard male connector parts,
which involves a positive locking effect and which does not need any lateral openings
in the connector housing or the pacemaker housing. At the same time, it should
be possible to easily remove the male connector part without any need of manual
operations involving special tools. The object further is to provide a connector
that is suitable for use in so called black holes. Black holes are connectors made
directly in the pacer housing without any need for the commonly used molded-on
connector parts in the form of headers. A further object is to provide a connector
that will indicate visually when the male connector plug has been inserted correctly.
DESCRIPTION OF THE DRAWINGS
FIGS. 1-1
a illustrate the component parts of a locking device for a
female connector part in accordance with the invention.
FIG. 2 shows the component parts in FIG. 1 in an assembled state in a section.
FIG. 3 illustrates the locking device just before the insertion of a male connector pin.
FIG. 4 illustrates a first locking state indicating a correct engagement.
FIG. 5 illustrates a second locking state.
FIG. 6 illustrates the opening of the locking device.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the description below, "longitudinal" relates to the longitudinal direction
of the female connector part and "outer end" relates to the end of the locking
device accessible from the outside. It should be noted that all reference signs
are not repeated throughout all drawings.
The component parts of a locking part
1 for a female connector according
to a preferred embodiment are shown in an exploded view in FIG.
1. The locking
part comprises a hollow cylindrical part
5 with an end wall
8 in
which a central opening
15 is located. The opening
15 is dimensioned
to receive the contact pin of a standard male connector. The outside of the cylindrical
part is provided with circumferential grooves
3 serving as space for excess
glue when the cylindrical part is glued into a female connector part.
The locking device further comprises a locking washer
7 with a central
opening
18. Two locking tongues
19,
19′ are located
on opposite sides of the opening
18 and extend into the opening. The distance
between the tips is less than the diameter of the male connector pin to be locked
into the locking device. The washer
7 has an outer shape that includes two
parallel sides
17,
17′. The two parallel sides will bias the
tongues towards the common plane of the washer. It should be noted that in this
particular embodiment the sides have been designed to be parallel in order to define
the bending force of the sides of the washer. The design may also be used for locking
the washer against rotation, as will be described in connection with an alternative embodiment.
The inside of the inner end wall is provided with a flange
9 around the
opening
15. The flange has been placed in such a way that there will be
a distance between the flange and the inner surface of the wall of the cylindrical
part
5. The edge
11 of the flange facing the inside wall of the cylindrical
part
5 is rounded. The flange
9 will serve as a pivot for the tongues.
The locking device further comprises a cylindrical plunger
4 fitting into
the cylindrical part
5. The plunger is provided with a central bore
14
and the outside of the plunger is provided with a spiraling groove
6 intersecting
a longitudinal groove
13. These grooves are intended to cooperate with an
interior lug
12 located on the inside wall of the cylindrical part
5.
The outer side of the outer end of the plunger
4 is provided with a peripheral
groove
16 intended to sealingly hold an O-ring
20 against the inside
of the cylindrical part
5. As seen in FIG. 1
a, a part
6′
of the spiraling groove
6 passes beyond the intersection with the groove
13.
The inside of the inner end of the plunger
4 is provided with a conical
surface
10, the wall of the plunger
4 thus tapering into a peripheral
edge
21.
The outer end of the longitudinal bore of the plunger
4 is closed by means
of a plug
2. The opening in the bore is enlarged by means of a slit permitting
the insertion of a screwdriver or an equivalent tool.
In the assembled state, illustrated in FIGS. 2-6, the plunger
4 will keep
the washer
7 in the vicinity of the flange
9. The plunger will be
held in the cylindrical part
5 by means of the longitudinal slot
13,
which permits a limited longitudinal movement.
The locking device is simple to assemble. The procedure only comprises the steps of:
- placing the washer 7 in the cylindrical part 5,
- mounting the sealing ring 20 in the groove 16 on the plunger 4,
- engaging the lug 12 in the slot 6 and turning the plunger
until the lug 12 is located in the longitudinal slot 13.
The locking device
1 can be glued, welded or otherwise bonded into a tubular
connector. The device of course also can be molded into a header.
A male connector pin
30 to be locked into the locking device
1
is
inserted through the opening
15 in the end wall
8 as illustrated
in FIG.
3. As seen in FIG. 4, the plunger
4 in this particular embodiment
can move outwards together with the washer
7 when the pin
30 engages
the washer
7. The outward movement is limited by the lug
12 engaging
the inner end of the slot
13. In the case in which the locking device is
located in a through hole flush with the outer surface of the pacer in which it
is to be mounted, the outward movement will be an indication that the male connector
pin
30 has been correctly inserted, see FIG.
4.
Since the distance between the tips of the two tongues
19,
19′
is less than the diameter of the pin
30, the tongues will be bent in the
direction of insertion and consequently form an angle with the surface of the pin.
The spring bias of the two parallel sides of the washer will urge the tongues into
contact with the pin. The length and the stiffness of the tongues is such that
the tongues in principle cannot swing past the plane of the washer, the pin therefore
will be locked behind the end wall
8 against withdrawal from the connector.
When the pin has been fully inserted, the plunger
4 can be pushed back
into the cylindrical part
5 so as to be flush with the outside of the housing
as indicated in FIG.
5.
If the pin is to be disconnected, the plunger
4 is pushed inwardly, the
inner peripheral edge
21 engaging the peripheral ends of the washer
7
as illustrated in FIG.
6. As a consequence, the tongues
19,
19′
will swing around the flange and release the pin. The pin with lead then easily
can be withdrawn.
The removal of the male pin
30 from the connector can be facilitated by
removing the plug
2 from the plunger and screwing the plunger into the cylindrical
part
5 by means of the groove
6′. The plunger
4 thus
will deflect the tongues
19,
19′ from the pin. The pitch of
the groove is chosen such that the plunger
4 will remain in the rotational
position of the screwed-in state in spite of the outward force exerted by the deformed
washer
7. The pin then can be pushed out from the connector by means of
a suitable tool that can be inserted through the opening of the bore
14.
It should be noted that, in the above embodiment, the washer is not locked against
rotation. If however the washer is locked against rotation, it will be possible
to locate the tongues (excluding the remaining parts of the washer) on a stud each
instead on a circular flange. The studs also will serve s pivots for the tongues.
In this case the force needed to swing the tongues out of engagements with the
pin would be less, given that the dimensions of the washer remains the same (the
spring bias of the tongues into engagement with the pin would however not be affected).
In this embodiment the studs are located opposite each other adjacent the central
opening
15. The inner side of the wall of the cylindrical part adjacent
the studs is shaped to conform to the outer peripheral shape of the washer
7,
thus also having two parallel sides in cross-section. The parallel sides are parallel
to a centerline drawn through the two studs. In this way, the washer will be locked
against rotation when the washer is located on the studs.
In this particular embodiment the inner part of the outside of the plunger would
have to have a shape corresponding to the inner shape of the cylindrical part
5.
Although the plunger still could be mounted in the cylindrical part by means of
a spiraling groove, the option of opening the locking device by rotating the plunger
discussed in connection with the above embodiment would be excluded. If this option
also were desirable, the means for locking the washer against rotation would have
to be located within the outer periphery of the washer and extend past the washer.
The inside of the plunger would have to be hollowed to accommodate these means
in order to allow the free rotation of the plunger to its innermost location.
The electrical connections from the female connector to the pulse generator are
not a part of the present invention and thus are not shown in detail. The connections
may for instance be made through circular springs
31 engaging the contact
surfaces
32 on the male connector
30, as for instance indicated in
FIG.
5. These rings are in turn connected to the interior of the pacer.
The cylindrical part
5 and the plunger
4 may be made of any suitable
biocompatible material used in pacers, as for instance metals such s titanium,
stainless steel, NP-35 alloy, or ceramics such as Al2O3 or of plastics such as
macrolon, epoxy resin etc. The two parts may be made of the same material or of
different materials. The tongues and washer preferably is made of titanium, stainless
steel or NP-35, but other biocompatible materials having a comparable resilience
may of course be used.
The invention of course can be varied in many ways within the scope of the appended
claims. In the above embodiments, the washer has been described as having two tongues.
It is however quite possible to use only one tongue or more than two tongues. The
tongues have been illustrated as being part of a resilient washer, but they may
of course be associated with separate springs for instance formed integrally with
said tongues. The cylindrical part has been illustrated as a separate part, but
may of course be an integral part of a pacer housing or header. In the widest sense,
the plunger may be any device transferring a pushing force for the exterior of
the pacer to the peripheral parts of the washer.
The male connector part has been illustrated above as being a standard IS-1 male
connector with a complementary female connector. The male connector part of course
could be of any kind having an elongate shape, the female connector part having
a corresponding complementary shape.
Although modifications and changes may be suggested by those skilled in
the art, it is the invention of the inventor to embody within the patent warranted
heron all changes and modifications as reasonably and properly come within the
scope of his contribution to the art.
*
