U.S. patent application number 11/635879 was filed with the patent office on 2007-04-12 for resettable safety shield for medical needles.
This patent application is currently assigned to Specialized Health Products Inc.. Invention is credited to F. Mark Ferguson, Daniel K. Smith, Jeremy W. Snow.
Application Number | 20070083167 11/635879 |
Document ID | / |
Family ID | 46205031 |
Filed Date | 2007-04-12 |
United States Patent
Application |
20070083167 |
Kind Code |
A1 |
Smith; Daniel K. ; et
al. |
April 12, 2007 |
Resettable safety shield for medical needles
Abstract
A medical needle shield apparatus is provided that includes a
needle hub having an outer needle cannula extending therefrom. An
inner needle is disposed for slidable movement with the outer
needle cannula. At least one shield is extensible from a retracted
position to an extended position to enclose a distal end of the
inner needle. The shield includes a binding member disposed within
the shield and defines binding surfaces that form an aperture
configured for slidable receipt of the inner needle. The binding
member includes a binding member reset surface aligned with a hub
reset surface for engagement therewith to allow reuse of a shielded
needle apparatus.
Inventors: |
Smith; Daniel K.; (Woods
Cross, UT) ; Snow; Jeremy W.; (North Salt Lake,
UT) ; Ferguson; F. Mark; (Salt Lake City,
UT) |
Correspondence
Address: |
SPECIALIZED HEALTH PRODUCTS INC.;c/o INTELLEVATE
P.O. BOX 52050
MINNEAPOLIS
MN
55402
US
|
Assignee: |
Specialized Health Products
Inc.
|
Family ID: |
46205031 |
Appl. No.: |
11/635879 |
Filed: |
December 8, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10721526 |
Nov 25, 2003 |
7179244 |
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11635879 |
Dec 8, 2006 |
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10409819 |
Apr 8, 2003 |
6796962 |
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10721526 |
Nov 25, 2003 |
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10322288 |
Dec 17, 2002 |
7004927 |
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10409819 |
Apr 8, 2003 |
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10202201 |
Jul 23, 2002 |
6902546 |
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10409819 |
Apr 8, 2003 |
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09809357 |
Mar 15, 2001 |
6595955 |
|
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10202201 |
Jul 23, 2002 |
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60424655 |
Nov 7, 2002 |
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Current U.S.
Class: |
604/263 |
Current CPC
Class: |
A61M 2005/1581 20130101;
A61M 25/0618 20130101; A61M 5/3273 20130101; A61M 2005/325
20130101; A61M 5/3275 20130101; A61M 5/326 20130101 |
Class at
Publication: |
604/263 |
International
Class: |
A61M 5/00 20060101
A61M005/00 |
Claims
1. A medical needle shield apparatus comprising: a needle hub
having an outer needle cannula extending therefrom to a distal end,
an inner needle being disposed for slidable movement with the outer
needle cannula; and at least one shield being extensible from a
retracted position to an extended position to enclose a distal end
of the inner needle, the shield including a binding member disposed
within the shield and defining binding surfaces that form an
aperture configured for slidable receipt of the inner needle
between the retracted position and the extended position, the
binding member including at least one drag inducing member such
that the at least one drag inducing member engages the inner needle
during slidable receipt of the inner needle to create a drag force
with the inner needle, the drag force and shield facilitating
rotation of the binding member relative to a longitudinal axis of
the inner needle such that the binding surfaces engage the inner
needle to prevent slidable movement of the inner needle in the
extended position of the shield, the binding member further
including a needle communicating surface extending therefrom such
that the needle communicating surface is engageable with the inner
needle to prevent rotation of the binding member, a retainer for
releasable engagement with the needle hub, and the binding member
further including a binding member reset surface aligned with a hub
reset surface.
2. A medical needle shield apparatus as recited in claim 1, wherein
the at least one drag inducing member defines a cavity that is
substantially aligned with the aperture, the cavity being
configured for slidable receipt of the needle to create the drag
force with the needle.
3. A medical needle shield apparatus as recited in claim 1, wherein
the binding member includes a substantially planar aperture plate
that includes the binding surfaces that form the aperture.
4. A medical needle shield apparatus as recited in claim 3, wherein
the at least one drag inducing member includes a pair of arms
extending from the aperture plate.
5. A medical needle shield apparatus as recited in claim 3, wherein
the arm includes a deflectable member.
6. A medical needle shield apparatus as recited in claim 1, wherein
the binding member is rotatable, relative to a longitudinal axis of
the inner needle, between a non-binding orientation whereby the
inner needle is slidable relative to the binding member and a
binding orientation whereby the binding surfaces engage the inner
needle to prevent slidable movement of the inner needle in the
extended position of the at least one shield.
7. A medical needle shield apparatus as recited in claim 1, wherein
the shield includes a housing that defines at least one blocking
member extending from an interior surface thereof, the at least one
blocking member being engageable with the binding member for urging
the binding member to a binding orientation.
8. A medical needle shield apparatus as recited in claim 3, wherein
the shield includes a housing that defines at least one blocking
member extending from an interior surface thereof, the aperture
plate being axially movable for engagement with the at least one
blocking member that causes rotation of the binding member to a
binding orientation.
9. A medical needle shield apparatus as recited in claim 1, wherein
the at least one shield is supported for relative rotational
movement by at least one bearing.
10. A medical needle shield apparatus as recited in claim 1,
wherein the inner needle is attached to a handle for manipulation
thereof.
11. A medical needle shield apparatus as recited in claim 1,
wherein the needle hub is releasably mountable with a housing of
the at least one shield.
12. A medical needle shield apparatus as recited in claim 1,
wherein the needle hub defines a hub slot that is configured to
receive the retainer of the binding member.
13. A medical needle shield apparatus as recited in claim 1,
wherein the binding member includes at least one outwardly arcuate
arm that extends to the needle communicating surface.
14. A medical needle shield apparatus as recited in claim 1,
further comprising a plurality of shields.
15. A medical needle shield apparatus as recited in claim 1,
wherein said binding member reset surface comprises the distal
facing surface of said retainer.
16. A medical needle shield apparatus as recited in claim 1,
wherein said hub reset surface is configured to deflect said
binding member reset surface to facilitate rotation of the binding
member relative to said longitudinal axis such that said binding
surface disengages the inner needle.
17. A medical needle shield according to claim 1, wherein said
medical needle is adapted for bone biopsy.
18. A medical needle shield according to claim 1, wherein said
medical needle is adapted for catheter introduction to a
patient.
19. A medical needle shield apparatus as recited in claim 1,
wherein said hub reset surface is separate from said hub and urged
by a spring toward said binding member reset surface.
20. A medical needle shield apparatus of claim 19, further
comprising a luer male taper configured with said hub.
21. A medical needle shield according to claim 1, wherein said
medical needle operates in communication with a port access
device.
22. A medical needle shield according to claim 1, further
comprising a protective needle sheath member.
23. A medical needle shield apparatus comprising: a needle hub
having an outer needle cannula extending therefrom, an inner needle
being disposed for slidable movement with the outer needle cannula;
and a shield being extensible from a retracted position to an
extended position to enclose a distal end of the outer needle
cannula, the shield including a binding member disposed within the
shield and defining binding surfaces that form an aperture
configured for slidable receipt of the outer needle cannula between
the retracted position and the extended position, the binding
member including at least one drag inducing member such that the at
least one drag inducing member engages the outer needle cannula
during slidable receipt of the outer needle cannula to create a
drag force with the outer needle cannula, the drag force and shield
facilitating rotation of the binding member relative to a
longitudinal axis of the outer needle cannula such that the binding
surfaces engage the outer needle cannula to prevent slidable
movement of the outer needle cannula in the extended position of
the shield, and the binding member further including a needle
communicating surface extending therefrom such that the needle
communicating surface is engageable with the outer needle cannula
to prevent rotation of the binding member.
24. A medical needle shield apparatus as recited in claim 23,
wherein the binding member is rotatable, relative to a longitudinal
axis of the outer needle cannula, between a non-binding orientation
whereby the outer needle cannula is slidable relative to the
binding member and a binding orientation whereby the binding
surfaces engage the outer needle cannula to prevent slidable
movement of the outer needle cannula in the extended position of
the shield.
25. A medical needle shield apparatus as recited in claim 23,
wherein the shield includes a housing that defines at least one
blocking member extending from an interior surface thereof, the
binding member including an aperture plate being axially movable
for engagement with the at least one blocking member that causes
rotation of the binding member to a binding orientation.
26. A medical needle shield apparatus as recited in claim 23,
wherein the shield includes a probe guide at a distal end thereof
configured for receipt of a probe, the probe being configured for
slidable movement with the outer needle cannula.
27. A medical needle shield apparatus comprising: a needle hub
having an outer needle cannula extending therefrom to a distal end,
an inner needle being disposed for slidable movement with the outer
needle cannula, a handle being attached to the inner needle; and a
shield being releasably mountable to the needle hub and extensible
from a retracted position to an extended position to enclose a
distal end of the inner needle, the handle being disposed adjacent
the shield, the shield including a binding member disposed within
the shield and defining binding surfaces that form an aperture
configured for slidable receipt of the inner needle between the
retracted position and the extended position, the binding member
including at least one drag inducing member such that the at least
one drag inducing member engages the inner needle during slidable
receipt of the inner needle to create a drag force with the inner
needle, the drag force and shield facilitating rotation of the
binding member relative to a longitudinal axis of the inner needle
such that the binding surfaces engage the inner needle to prevent
slidable movement of the inner needle in the extended position of
the shield, and the binding member further including a needle
communicating surface extending therefrom such that the needle
communicating surface is engageable with the inner needle to
prevent rotation of the binding member, a retainer for releasable
engagement with a hub slot of the needle hub, and a binding member
reset surface aligned for engagement with a hub reset surface.
28. A medical needle shield apparatus as recited in claim 27,
wherein the binding member is rotatable, relative to a longitudinal
axis of the inner needle, between a non-binding orientation whereby
the inner needle is slidable relative to the binding member and a
binding orientation whereby the binding surfaces engage the inner
needle to prevent slidable movement of the inner needle in the
extended position of the shield.
29. A medical needle shield apparatus as recited in claim 27,
wherein the shield includes a housing that defines at least one
blocking member extending from an interior surface thereof, the
binding member including an aperture plate being axially movable
for engagement with the at least one blocking member that causes
rotation of the binding member to a binding orientation.
30. A medical needle shield apparatus as recited in claim 27,
further comprising a luer slip or luer lock attachment feature.
31. A medical needle shield apparatus as recited in claim 27,
further comprising a flash chamber in communication with the inner
needle, the flash chamber having a fitting that facilitates
connection to a medical device.
32. A medical needle shield apparatus comprising: a needle hub
having a needle cannula extending therefrom to a distal end; at
least one shield being extensible from a retracted position to an
extended position to enclose a distal end of the needle cannula;
and a depth stop device slidably disposed on the needle cannula,
said at least one shield being substantially disposed within said
depth stop device.
33. A medical needle shield apparatus comprising: a needle hub
having an outer needle cannula extending therefrom to a distal end,
an inner needle being disposed for slidable movement with the outer
needle cannula; and at least one shield being extensible from a
retracted position to an extended position to enclose a distal end
of the inner needle, the needle shield further including a reset
surface aligned with a hub reset surface for engagement therewith
to allow reuse of the shield in a shielded configuration.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This patent application is a divisional of U.S. Utility
patent application Ser. No. 10/721,526, filed in the U.S. Patent
and Trademark Office on Nov. 25, 2003, which is a
continuation-in-part of U.S. Utility patent application Ser. No.
10/409,819, filed in the U.S. Patent and Trademark Office on Apr.
8, 2003 by Ferguson et al., which is a continuation-in-part of U.S.
Utility application Ser. No. 10/322,288, filed in the U.S. Patent
and Trademark Office on Dec. 17, 2002 by Ferguson et al., which
claims priority to U.S. Provisional Patent application Ser. No.
60/424,655, filed in the U.S. Patent and Trademark Office on Nov.
7, 2002 by Bagley et al., and U.S. Utility patent application Ser.
No. 10/202,201, filed in the U.S. Patent and Trademark Office on
Jul. 23, 2002 by Ferguson et al., which is a continuation-in-part
of U.S. Utility patent application Ser. No. 09/809,357, filed in
the U.S. Patent and Trademark Office on Mar. 15, 2001 by Ferguson
et al., the entire contents of each of these disclosures being
hereby incorporated by reference herein.
BACKGROUND
[0002] 1. Technical Field
[0003] The present disclosure generally relates to safety shields
for medical needles, and more particularly, to resettable safety
shields that protect a needle point of a medical needle.
[0004] 2. Description of the Related Art
[0005] Problems associated with inadvertent needle sticks are well
known in the art of blood sampling, percutaneous medication
injection and other medical procedures involving use of medical
needles. Significant attention has been focused on needle stick
problems due to the contemporary sensitivity of exposure to AIDS,
Hepatitis and other serious blood-borne pathogen exposures.
[0006] Procedures for removing a needle from a patient commonly
require a technician to use one hand to place pressure at the wound
site where the needle is being withdrawn, while removing the needle
device with the other hand. It is also common practice for an
attending technician to give higher priority to care for the
patient than is given to disposal of a needle. In the case of
typical needle devices without safety shields, such priority either
requires the convenience of an available sharps container within
reach or another means for safe disposal without leaving the
patient's side. Providing adequate care while following safety
procedures is often compounded by the patient's physical condition
and mental state, such as in burn units and psychiatric wards.
Under such conditions, it is difficult to properly dispose of a
used needle while caring for a patient.
[0007] The widespread knowledge and history associated with needle
care and disposal problems have resulted in numerous devices for
preventing accidental needle sticks. Problems of current safety
devices include difficulty of use and high cost due to their
complexity and number of parts.
[0008] Other known devices employ sheaths that are spring
activated, telescoping, pivoting, etc. These devices, however, may
disadvantageously misfire or be cumbersome to activate. Further
drawbacks of current devices include high manufacturing cost due to
complexity and the number of parts. Thus, these type prior art
devices may not adequately and reliably shield medical needle
apparatus to prevent hazardous exposure.
[0009] Consequently, there remains a need to provide a more
satisfactory solution for needle safety devices by overcoming the
disadvantages and drawbacks of the prior art. Therefore, it would
be desirable to provide a more adequate and reliable medical needle
shield apparatus that employs a safety shield slidably movable
along a medical needle to prevent hazardous exposure to a needle
tip. It would be advantageous to provide such a safety shield that
is capable of being reset to safely allow re-use of certain needle
apparatus. Such a needle shield apparatus should be easily and
reliably movable to shield a needle tip of a needle cannula.
SUMMARY
[0010] Accordingly, the present disclosure addresses a need for a
medical needle shield apparatus which effectively and inexpensively
protects a tip of a medical needle after use. The present
disclosure resolves related disadvantages and drawbacks experienced
in the art. More specifically, the apparatus and method of this
invention constitute an important advance in the art of safety
needle devices.
[0011] In one particular embodiment, a medical needle shield
apparatus is provided in accordance with the principles of the
present disclosure. The medical needle shield apparatus includes a
needle hub having an outer needle cannula extending therefrom to a
distal end. An inner needle is disposed for slidable movement with
the outer needle cannula. At least one shield is extensible from a
retracted position to an extended position to enclose a distal end
of the inner needle. The shield includes a binding member disposed
within the shield and defines binding surfaces that form an
aperture configured for slidable receipt of the inner needle
between the retracted position and the extended position.
[0012] The binding member includes at least one drag inducing
member such that the member engages the inner needle during
slidable receipt of the inner needle to create a drag force with
the inner needle. The drag force facilitates rotation of the
binding member relative to a longitudinal axis of the inner needle
such that the binding surfaces engage the inner needle to prevent
slidable movement of the inner needle in the extended position of
the shield. The binding member further includes a needle
communicating surface extending therefrom such that the needle
communicating surface is engageable with the inner needle to
prevent rotation of the binding member. A retainer extends
transversely from the binding member for releasable engagement with
the needle hub.
[0013] The binding member may be rotatable, relative to a
longitudinal axis of the inner needle, between a non-binding
orientation whereby the inner needle is slidable relative to the
binding member and a binding orientation whereby the binding
surfaces engage the inner needle to prevent slidable movement of
the inner needle in the extended position of the at least one
shield. The binding member may include one or more outwardly
arcuate arms that extend to the needle-communicating surface.
[0014] The inner needle can be attached to a handle for
manipulation thereof. The needle hub may define a hub slot
configured for receipt of the retainer. The needle hub may be
releasably mountable with a housing of the at least one shield. The
medical needle shield apparatus may further include a plurality of
shields.
[0015] The at least one drag inducing member may define a cavity
that is substantially aligned with the aperture. The cavity is
configured for slidable receipt of the needle to create the drag
force with the needle. The binding member may include a
substantially planar aperture plate that includes the binding
surfaces that form the aperture. The at least one drag inducing
member may include a pair of arms extending from the aperture
plate. The arms can have curled end portions spaced apart from the
aperture plate. The arms can include deflectable members.
[0016] The shield can include a housing that defines at least one
blocking member extending from an interior surface thereof. The at
least one blocking member can be engageable with the binding member
for urging the binding member to a binding orientation. The
aperture plate is axially movable for engagement with the at least
one blocking member that causes rotation of the binding member to a
binding orientation.
[0017] A binding member reset surface extends transversely from the
binding member. The needle hub includes a hub reset surface aligned
to contact with the binding member reset surface of an activated
binding member when the shield housing is brought to mate
concentrically with the needle hub. The hub reset surface deflects
the binding member reset surface along with the needle engagement
surface to a position above the inner needle surface and urges the
binding member from the binding orientation to the sliding
orientation. Concurrently, due to contact between the hub reset
surface and binding member reset surface, the hub retainer is urged
into a position that reengages the needle hub and retains the
needle hub to the needle shield. In an illustrative embodiment, the
hub reset surface is the distal facing surface of the hub
retainer.
[0018] The medical needle shield apparatus may further be supported
for relative rotational movement by at least one bearing.
[0019] In an alternate embodiment, the medical needle shield
apparatus includes a shield being extensible from a retracted
position to an extended position to enclose a distal end of the
outer needle cannula. The shield defines a probe guide at a distal
end thereof that is configured for receipt of a probe. The probe is
configured for slidable movement with the outer needle cannula.
[0020] In another embodiment, the medical needle shield apparatus
includes a needle hub having an outer needle cannula extending
therefrom to a distal end. An inner needle is disposed for slidable
movement with the outer needle cannula. A handle is attached to the
inner needle and defines a flash chamber in communication with the
inner needle. The flash chamber has a fitting, such as a luer
connection, that facilitates connection to a medical device. A
shield is releasably mountable to the needle hub and extensible
from a retracted position to an extended position to enclose a
distal end of the inner needle. The handle is disposed adjacent the
shield.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The foregoing and other features and advantages of the
present invention will be more fully understood from the following
detailed description of the exemplary embodiments, taken in
conjunction with the accompanying drawings in which:
[0022] FIG. 1 is a perspective view of one particular embodiment of
a medical needle shield apparatus in accordance with the principles
of the present disclosure;
[0023] FIG. 2 is a perspective view of the embodiment shown in FIG.
1 in a shielded configuration;
[0024] FIG. 3 is a cutaway perspective view of a shield of the
medical needle shield apparatus shown in FIG. 1 in a non-binding
orientation;
[0025] FIG. 4 illustrates the cutaway perspective view of the
medical needle shield apparatus shown in FIG. 2 in a binding
orientation;
[0026] FIG. 5 is a perspective view of the housing of a needle
safety apparatus as shown in FIG. 1;
[0027] FIG. 6 is a cutaway perspective of the grip element of a
needle safety apparatus as shown in FIG. 1;
[0028] FIG. 7 is an enlarged perspective view of a binding member
of the medical needle shield apparatus shown in FIG. 1;
[0029] FIG. 8 is a perspective view of the needle shield apparatus
as shown in FIG. 1 having a protective needle sheath installed
thereon;
[0030] FIG. 9 is an alternate enlarged perspective view of the
binding member shown in FIG. 7;
[0031] FIGS. 10-11 are cutaway perspective views of the medical
needle safety apparatus showing engagement between hub reset
surface and binding member reset surface according to the present
disclosure;
[0032] FIG. 12 is a cutaway perspective view of an embodiment of
the medical needle safety apparatus according to the present
disclosure adapted for use with a luer lock needle hub;
[0033] FIG. 13 is a cutaway perspective view the medical needle
safety apparatus as shown in FIG. 12 in a shielded
configuration;
[0034] FIG. 14 is an enlarged perspective view of the medical
needle safety apparatus as shown in FIG. 12 showing engagement
between hub reset surface and binding member reset surface
according to the present disclosure;
[0035] FIG. 15 is an enlarged perspective view of the medical
needle safety apparatus as shown in FIG. 12 in a reset
configuration;
[0036] FIG. 16 is a perspective view of an embodiment of a medical
needle shield apparatus adapted for use with a bone biopsy needle
in accordance with the principles of the present disclosure;
[0037] FIG. 17 is an enlarged cross-sectional view of the depth
stop assembly shown in FIG. 16;
[0038] FIG. 18 is an enlarged cross-sectional view of the handle
assembly shown in FIG. 16;
[0039] FIG. 19 is a perspective view of the medical needle shield
apparatus shown in FIG. 16 with the depth stop assembly partially
advanced along the threaded sleeve;
[0040] FIG. 20 is a perspective view of the medical needle shield
apparatus shown in FIG. 16 with the stylet partially extended from
the needle hub;
[0041] FIG. 21 is a cross-sectional view of the medical needle
shield apparatus as shown in FIG. 20;
[0042] FIG. 22 is a perspective view of the medical needle shield
apparatus shown in FIG. 16 with the stylet fully extended from the
needle hub;
[0043] FIG. 23A is an enlarged cross-sectional view of the medical
needle shield apparatus as shown in FIG. 22;
[0044] FIG. 23B is an enlarged cross-sectional view of an alternate
embodiment of the medical needle shield apparatus shown in FIG.
22;
[0045] FIG. 24 is a perspective view of the medical needle shield
apparatus shown in FIG. 16 with the stylet removed and a syringe
inserted in the needle hub for aspiration purposes;
[0046] FIG. 25 is a perspective view of the medical needle shield
apparatus shown in FIG. 16 with the depth stop assembly
removed;
[0047] FIG. 26 is a perspective view of the medical needle shield
apparatus shown in FIG. 16 in the shielded configuration;
[0048] FIG. 27 is an enlarged cross-sectional view of the medical
needle shield apparatus shown in FIG. 26;
[0049] FIG. 28 is a perspective view of an embodiment of a medical
needle shield apparatus adapted for use with a PICC introducer in
accordance with the principles of the present disclosure;
[0050] FIG. 29 is an alternative perspective view of an embodiment
of a medical needle shield apparatus illustrated in FIG. 28;
[0051] FIG. 30 is an enlarged cutaway perspective view of the
embodiment shown in FIG. 28 in a retracted position;
[0052] FIG. 31 is a perspective view of the embodiment shown in
FIG. 28 in a shielded configuration;
[0053] FIG. 32 is a cutaway perspective view of the embodiment
shown in FIG. 28 in a shielded configuration;
[0054] FIG. 33 is a cutaway perspective view of the embodiment
shown in FIG. 28 in a reset configuration in accordance with the
present disclosure;
[0055] FIG. 34 is a perspective view of an embodiment of a medical
needle shield apparatus adapted for use with an implanted port
access in accordance with the principles of the present
disclosure;
[0056] FIG. 35 is a perspective view of the embodiment shown in
FIG. 34 in an unshielded configuration;
[0057] FIG. 36 is a cutaway perspective view of the embodiment
shown in FIG. 34 in a shielded configuration;
[0058] FIG. 37 is a cutaway perspective view of the embodiment
shown in FIG. 34 in an unshielded configuration;
[0059] FIG. 38 is a perspective view of an embodiment of a medical
needle shield apparatus adapted for use with a drug vial access in
accordance with the principles of the present disclosure;
[0060] FIG. 39 is a perspective view of the embodiment shown in
FIG. 38 in an unshielded configuration;
[0061] FIG. 40 is cutaway perspective view of the embodiment shown
in FIG. 39 in a shielded configuration; and
[0062] FIG. 41 is a cutaway perspective view of the embodiment
shown in FIG. 39 in a reset configuration according to the
principles of the present disclosure.
DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
[0063] The exemplary embodiments of the medical needle shield
apparatus and methods of operation disclosed are discussed in terms
of medical needles for infusion of intravenous fluids, medication
infusion or fluid collection, guiding of other needles, e.g.,
biopsy, and more particularly, in terms of needle shield apparatus
employed with a needle cannula that prevent hazardous exposure to
the needle tip, including, for example, inadvertent needle sticks.
It is envisioned that the present disclosure, however, finds
application to a wide variety of cannula needles and devices for
the infusion of preventive medications, medicaments, therapeutics,
etc. to a subject, such as, for example, epidural needles, spinal
needles, biopsy needles, chiba needles, potts cournand needles,
coaxial introducer needles, Y-sites, etc. It is also envisioned
that the present disclosure may be employed for collection of body
fluids and/or tissues, including those employed during procedures
relating to soft tissue biopsy, bone biopsy, phlebotomy, digestive,
intestinal, urinary, veterinary, etc. It is contemplated that the
medical needle shield apparatus may be utilized with other medical
needle applications including, but not limited to, fluid infusion,
fluid collection, catheters, catheter introducers, guidewire
introducers, biopsy needle introducers, spinal and epidural,
biopsy, aphaeresis, dialysis, blood donor, Veress needles, Huber
needles, etc.
[0064] In the discussion that follows, the term "proximal" refers
to a portion of a structure that is closer to a clinician, and the
term "distal" refers to a portion that is further from the
clinician. As used herein, the term "subject" refers to a patient
that receives infusions or has blood and/or fluid collected
therefrom using the medical needle shield apparatus. According to
the present disclosure, the term "clinician" refers to an
individual administering an infusion, performing fluid or tissue
collection, installing or removing a needle cannula from a medical
needle shield apparatus and may include support personnel.
[0065] The following discussion includes a description of the
medical needle shield apparatus, followed by a description of the
method of operating the medical needle shield apparatus in
accordance with the present disclosure. Reference will now be made
in detail to the exemplary embodiments of the disclosure, which are
illustrated in the accompanying figures.
[0066] Turning now to the figures, wherein like components are
designated by like reference numerals throughout the several views.
Referring initially to FIGS. 1-11, there is illustrated a medical
needle shield apparatus, constructed in accordance with the
principals of the present disclosure. The medical needle shield
apparatus includes a shield 101 that is extensible from a retracted
position (FIGS. 1, 3) to an extended position (FIGS. 2, 4) to
enclose a distal end 115 of a needle such as, for example, stylet
106 of a needle assembly. The needle assembly includes a hollow
outer needle 103. Stylet 106 is slideably and concentrically
disposed with needle 103 for employment therewith during a medical
needle application, as will be discussed. A stylet handle 113 is
connected to stylet 106 to facilitate manipulation thereof. Other
needle assemblies are also contemplated, including for example,
needle cannulae, guide wire/introducers, etc.
[0067] A binding member 105 is disposed within shield 101 and
defines binding surfaces 122. Binding surfaces 122 form an aperture
configured for slidable receipt of stylet 106 between the retracted
position and the extended position. Binding member 105 includes a
drag inducing member, such as, for example, friction members 126
extending therefrom. Binding member 105 has a stylet communicating
surface 123 that is engageable with stylet 106 to prevent rotation
to the binding position of binding member 105.
[0068] Friction members 126 are configured for slidable engagement
with stylet 106 between the retracted position and the extended
position such that friction members 126 engage stylet 106 to create
a drag force with stylet 106. It is envisioned that one or a
plurality of friction members 126 may be employed.
[0069] The drag force in conjunction with one of blocking members
116 and/or 117, cause binding member 105 to move to a binding
position (FIG. 4). The force created by blocking members 116 and/or
117 acts in a direction opposite to the drag force. This causes a
force couple, which moves binding member 105 to the binding
position.
[0070] As stylet 106 is released from engagement with a stylet
communicating surface 123, binding member 105 and a retainer 114
move to the binding position. Rotation of binding member 105 is no
longer opposed by engagement with stylet 106 at stylet
communicating surface 123. Thus, binding member 105, with retainer
114, is subject to inclination into the binding position. Rotation
of binding member 105 causes binding surfaces 122 to frictionally
engage stylet 106 to prevent movement thereof.
[0071] Blocking members 116 and/or 117 cause binding member 105 to
move to the binding position as forces imposed on shield 101 cause
relative movement thereof in either direction along longitudinal
axis x. This maintains stylet 106 within shield 101 to avoid
hazardous exposure to distal end 115. It is envisioned that stylet
communicating surface 123 may include ribs, projections, cavities,
etc. for engagement with stylet 106 or that a portion of stylet
communicating surface 123 engages stylet 106.
[0072] The components of the medical needle shield apparatus can be
fabricated from a material suitable for medical applications, such
as, for example, polymerics or metals, such as stainless steel,
depending on the particular medical application and/or preference
of a clinician. Semi-rigid and rigid polymerics are contemplated
for fabrication, as well as resilient materials, such as molded
medical grade polypropylene. However, one skilled in the art will
realize that other materials and fabrication methods suitable for
assembly and manufacture, in accordance with the present
disclosure, also would be appropriate.
[0073] In an illustrative embodiment, shield 101 includes a bearing
102 that houses binding member 105. Bearing 102 may be
monolithically formed or integrally assembled of multiple sections
and may be substantially transparent, opaque, etc.
[0074] In the retracted position, shield 101 is disposed adjacent
to a needle hub 104 of outer needle 103. It is contemplated that
outer needle 103 may also be comprised of a flexible, polymeric
material, and that the components of the medical needle apparatus
may be employed with other needle applications, such as, for
example, catheters, PICC introducers, etc.
[0075] Binding member 105 may be monolithically formed and includes
an aperture plate 118, frictional members 126, end sensing member
119, stylet communicating surface 123, binding member reset surface
107 and retainer 114. It is contemplated that binding member 105
may include one or more frictional members 126, and that retainer
114 may extend from bearing 102. Aperture plate 118 may have a
rectangular, generally planar configuration with sufficient
stiffness to produce forces for binding stylet 106, as will be
discussed. It is envisioned that aperture plate 118 may have an
arcuate surface, undulating, etc. It is further envisioned that
aperture plate 118 may have various degrees of stiffness according
to the requirements of a particular application.
[0076] The embodiment of a resettable passive safety device
disclosed in FIGS. 1-11 show a hollow needle 103 solid stylet 106,
rotational housing with a stylet shield 125 and thrust bore 133, a
bearing 102 with thrust collar 132, and a binding member 105. The
thrust bore 133 and thrust collar 132 are configured to allow
rotation of stylet shield 125 relative to bearing 102.
[0077] The resettable feature of this device is employed after the
passive safety device has been activated. Initially, the safety
shield 101 and needle 103 are positioned over the stylet 106 (FIG.
1). During the medical procedure, the stylet 106 is automatically
protected by the safety shield 101 as the stylet 106 is withdrawn
from the needle (FIG. 2).
[0078] The safety shield 101 is advanced to near the distal end of
the stylet 115 in a position prior to activation of the binding
member 105 (FIG. 3). In this position, the hub retainer 114 retains
the proximity of the needle hub 104 to the safety shield 101 by
interacting with hub slot 124 and the binding member 105 is in the
sliding orientation. It is envisioned that hub slot 124 may be in
the form of other shapes for providing a cavity.
[0079] In FIG. 4, the safety shield 101 is positioned further
toward the distal end of the stylet 115 to the point where the
safety shield 101 is activated. The binding member 105 has moved to
the binding orientation and the hub retainer 114 of the binding
member 105 has released the needle hub 104.
[0080] In FIG. 2, the activated and locked safety shield 101 is
illustrated. In this configuration, the needle 103 has been
removed, the stylet distal end 115 is inside the housing at a
distance which prevents human contact, and the binding member 105
is in the binding orientation.
[0081] Frictional members 126 may be monolithically formed with
binding member 105 and extend from aperture plate 118 in
association therewith for alignment with aperture 138 and
engagement with stylet 106. Such engagement creates a frictional
drag force with stylet 106. This frictional drag force in
conjunction with one of the blocking members 116 and/or 117 causes
binding member 105 to move with stylet 106, which generates a
canting force and inclination of aperture plate 118. The canting
force and inclination urge rotation of binding member 105. It is
contemplated that a single friction member may be employed. It is
further contemplated that frictional members 126 may have flexible
portions, which may be of varying flexibility according to the
particular requirements of a needle application.
[0082] As facilitated by movement of stylet 106, the canting force
causes a lever or moment of end sensing member 119, which is
opposed to prevent rotation of binding member 105. The canting
force is opposed by engagement of stylet communicating surface 123
with stylet 106 in a non-binding or sliding orientation (FIG. 3) of
binding member 105.
[0083] End sensing member 119 extends distally from aperture plate
118. End sensing member 119 may be perpendicularly oriented
relative to a plane defined by aperture plate 118. This
perpendicular orientation facilitates inclination of aperture plate
118 for disposal in a binding or non-binding orientation of binding
member 105. It is envisioned that end sensing member 119 may be
variously oriented with aperture plate 118 and may flexibly extend
therefrom.
[0084] Stylet communicating surface 123 opposes the canting force
of end sensing member 119 directed to stylet 106. The canting force
is generated by friction members 126 in conjunction with one of
blocking members 116 and/or 117 and facilitates inclination of
aperture plate 118. Inclination, however, is prevented in the
non-binding or sliding orientation because of the engagement of
stylet communicating surface 123 with stylet 106. As stylet 106 is
retracted proximally and shield 101 is extended distally, stylet
106 continues to slideably engage stylet communicating surface
123.
[0085] As stylet 106 is released from engagement with stylet
communicating surface 123, as shown in FIG. 4, a drag force is
created between friction members 126 and stylet 106. The drag force
in conjunction with blocking member 116, cause aperture plate 118
to move to the binding position, as discussed.
[0086] Rotation of aperture plate 118 causes binding surfaces 122
to frictionally engage stylet 106 to prevent movement thereof.
Blocking members 116, 117 cause aperture plate 118 to move to the
binding position as forces are imposed on shield 101 in either
direction along longitudinal axis x. This maintains stylet 106
within shield 101 to avoid hazardous exposure to distal end
115.
[0087] Aperture 138 is formed within aperture plate 118 for
slidable engagement with stylet 106 during movement between the
retracted position and the extended position of shield 101.
Aperture 138 includes binding surfaces 122 formed on opposing sides
of aperture 138 that engage stylet 106 to prevent movement thereof
in the extended position of shield 101. It is contemplated that
engagement to prevent movement of stylet 106 may include
penetrating, frictional, interference, etc. It is envisioned that
aperture 138 may have various geometric configurations, such as
radial, polygonal, etc. It is further envisioned that aperture 138
may define an open cavity within aperture plate 118, such as, for
example, "U" shaped and open to one or a plurality of edges of
aperture plate 118.
[0088] The inclination of aperture plate 118 relative to
longitudinal axis x facilitates sliding and binding, via binding
surfaces 122, of stylet 106 within shield 101 to prevent hazardous
exposure to distal end 115. For example, as shown in FIG. 3,
aperture plate 118 is oriented at an angle of approximately
90.degree. relative to longitudinal axis x such that aperture plate
118 is disposed substantially perpendicular to stylet 106. In this
non-binding or sliding orientation, stylet 106 is free to slide
within aperture 138. As stylet 106 is retracted and shield 101 is
extended, stylet 106 continues to engage stylet communicating
surface 123 and aperture plate 118 maintains its perpendicular
orientation relative to longitudinal axis x.
[0089] Referring to FIG. 4, shield 101 is manipulated such that
friction members 126 in conjunction with blocking member 116 cause
binding member 105 to rotate relative to longitudinal axis x.
Aperture plate 118 rotates out of perpendicular alignment with
stylet 106 such that aperture plate 118 is oriented at an angle
less than 90.degree. with respect to longitudinal axis x.
[0090] As aperture plate 118 rotates, the binding member 105
approaches a binding orientation. The binding orientation includes
engagement of binding surfaces 122 with stylet 106 due to the
binding orientation of aperture plate 118. This engagement creates
binding frictional forces on stylet 106, in conjunction with
frictional members 126 and blocking members 116, 117 to prevent
movement of stylet 106 relative to shield 101 in both distal and
proximal directions, and to maintain distal end 115 within shield
101 to prevent hazardous exposure thereto.
[0091] Blocking members 116, 117 are disposed not to interfere with
stylet 106. Blocking members 116, 117 define surfaces that
facilitate disposal of aperture plate 118 in a binding
orientation.
[0092] For example, as shown in FIG. 3, shield 101 is in a
retracted position and stylet 106 is fully extended. Binding member
105 and aperture plate 118 are in a non-binding or sliding
orientation such that aperture plate 118 is substantially
perpendicular to longitudinal axis x. Blocking members 116, 117 may
engage aperture plate 118 to maintain aperture plate 118 in the
perpendicular orientation. Blocking members 116, 117 may also
maintain such orientation during extension of stylet 106 or may not
engage stylet 106.
[0093] As stylet 106 is retracted and shield 101 is extended, as
shown in FIG. 4, friction members 126 create a drag force via
engagement with stylet 106 on binding member 105 and in conjunction
with blocking member 116 cause aperture plate 118 to rotate in a
counter-clockwise direction to the binding position. Blocking
members 116, 117 engage aperture plate 118 to facilitate rotation
thereof from the perpendicular position into the binding position
such that binding surfaces 122 engage stylet 106, as discussed.
This configuration prevents movement of stylet 106.
[0094] Binding of binding member 105 to stylet 106 is facilitated
by the friction force generated between binding surfaces 122 and
stylet 106. This frictional engagement prevents axial movement of
stylet 106 relative to bearing 102 when shield 101 is in the
extended position. This configuration advantageously prevents
hazardous exposure to stylet 106. It is contemplated that binding
surfaces 122 may include sharp edges to increase frictional
engagement. It is further contemplated that the binding friction
force may be created and varied by one or more altering factors,
such as, for example, aperture 138 configuration and dimension,
stylet 106 configuration and dimension, aperture plate 118
thickness, the dimension from blocking members 116, 117 contact
point to the centerline of stylet 106 and the coefficient of
friction between aperture 138 and stylet 106 depending on the
particular requirements of a needle application. It is envisioned
that friction members 126 may be configured so as to vary the drag
force with variation of the inclination of the aperture plate 118,
this variation in drag force may be accomplished by geometric
changes in the shape of the friction members 126, such as wedge
shapes or the inclusion of notches to engage stylet 106, this
variation in drag force may also be accomplished through the
selective application of friction modifying materials or coatings
such as oils, jells, greases, or coatings which change the
friction.
[0095] It is envisioned that the aperture in aperture plate 118 may
create a drag force via engagement with sylet 106 to cause rotation
of binding member 105, similar to that described. It is further
envisioned that materials such as, for example, jells, greases,
etc. may be employed to create a frictional drag force with stylet
106 to cause rotation of binding member 105.
[0096] Needle hub 104 is mounted with needle 103 and is releasably
mounted with shield 101 via releasable engagement with retainer
114. Needle hub 104 is employed with the medical needle shield
apparatus of the present disclosure for various utility according
to the requirements of a particular medical needle application.
Shield 101 and needle hub 104 slidably support needle 103 and
stylet 106 for use thereof. Handle 113 facilitates manipulation
thereof.
[0097] Needle hub 104 has a hub slot 124 for receipt and engagement
with binding member 105. Needle hub 104 has a finger tab 160 for
urging needle hub 104 in a direction, along longitudinal axis x,
away from shield 101. This configuration facilitates removal and
use of needle hub 104 and needle 103 from shield 101 during a
medical needle application. It is contemplated that finger tab 160
may be alternatively configured and dimensioned according to the
needle application.
[0098] A flange 162 of needle hub 104 is concentrically supported
by a control surface 110 disposed about an inner surface of bearing
102. Control surface 110 engages an outer surface 164 of flange 162
for releasable support thereof. Outer surface 164 may engage
control surface 110 in a frictional, interference, etc. fit to
maintain releasable positioning with bearing 102. It is
contemplated that control surface 110 may engage other portions of
needle hub 104.
[0099] Bearing 102 includes hub stop surfaces 112 that facilitate
positioning of needle hub 104 with bearing 102. Hub stop surfaces
112 prevent proximal movement of needle hub 104 during mounting
with and relative to bearing 102. Hub stop surfaces 112
advantageously facilitate control of the degree of insertion with
bearing 102 according to the requirements of a particular medical
needle application. One or a plurality of hub stop surfaces 112 may
be employed. It is contemplated that hub stop surfaces 112 may
include springs, clips, etc. to facilitate attachment with needle
hub 104.
[0100] Retainer 114 may extend transversely from a distal end of
stylet communicating surface 123. Hub retainer 114 extends a
sufficient length for corresponding receipt within hub slot 124 of
needle hub 104. In association with a non-binding or sliding
orientation of binding member 105, retainer 114 engages needle hub
104, in hub slot 124, for releasably mounting with bearing 102 of
shield 101.
[0101] As stylet 106 is retracted in a proximal direction and
shield 101 is extended in a distal direction, retainer 114 rotates
in a counter clockwise direction (FIG. 4) relative to longitudinal
axis x due to the canting forces generated by friction members 126.
Retainer 114 disengages from hub slot 124 to release needle hub 104
from bearing 102. A clinician may manipulate finger tab 160 to
manipulate needle hub 104 distally and apart from shield 101. It is
contemplated that retainer 114 may be variously oriented from
binding member 105 or stylet communicating surface 123. It is
further contemplated that hub slot 124 may be variously dimensioned
to extend about the circumference of needle hub 104. Hub slot 124
may include tabs, etc. for retention with retainer 114.
[0102] To re-access the stylet distal end 115 using the resettable
passive safety device, the stylet shield 125 is brought to mate
concentrically with the proximal end of the needle hub 104, in a
similar fashion to the pre-activated state of the device. As this
occurs, the binding member reset surface 107 comes into contact
with the hub reset surface 108. This action is depicted in the
embodiment shown in FIG. 10.
[0103] As the stylet 106 is advanced from a proximal-to-distal
direction, the hub reset surface 108 deflects the binding member
reset surface 107, along with the end sensing member 119, to a
position above the stylet 106 surface and urges the binding member
105 from the binding orientation to the sliding orientation. With
the binding member 105 in the sliding orientation, the stylet 106
becomes free to advance into the needle 103.
[0104] Concurrently, due to the contact between the hub reset
surface 108 and the binding member reset surface 107, the hub
retainer 114 is urged into the hub slot 124. This causes the hub
retainer 114 of the binding member 105 to again retain the needle
hub 104 to the safety shield 101 through the interaction with the
hub slot 124 (FIG. 11).
[0105] Upon being reset, the safety shield 101 and needle 103 are
positioned over the stylet 106, as seen in FIG. 1. During the
medical procedure, the stylet 106 will be automatically protected
by the safety shield 101 as the stylet 106 is again withdrawn from
the needle.
[0106] FIGS. 12-15 illustrate the resettable safety shield
according to the present disclosure as applied to a needle with a
luer fitting 121 and a luer taper 109. In this embodiment, the hub
reset surface 108 is provided on a portion separate from the needle
hub 104. A hub reset surface spring 111 exerts a force to bias the
hub reset surface 108 in the proximal direction. The hub reset
surface spring 111 can be made from any number of suitable
resilient materials commonly known, including metal, plastic,
elastomeric materials, and the like.
[0107] In the embodiment wherein the hub reset surface 108 is
within the luer fitting 121, the hub reset surface spring 111
assures that the hub reset surface 108 is in the correct location
in the needle hub to provide alignment and engagement between the
hub reset surface 108 and binding member reset surface 107. When a
luer male taper, such as for example, a luer lock or luer slip is
inserted into needle hub 104, the hub reset surface spring 111 is
compressed and the hub reset surface 108 is displaced to allow the
luer male taper to mate with the entire length of luer taper 109.
It is envisioned that the hub reset surface 108 may also be
disposed around the luer fitting 121, as shown in FIG. 23B. The
embodiment shown in FIG. 23B also shows an alternate embodiment of
the reset surfaces 107 extending from the binding member 105 and
engaging retaining surface 141.
[0108] To re-access the stylet distal end 115 using the resettable
passive safety device, the stylet shield 125 is brought to mate
concentrically with the proximal end of the needle hub 104, in a
similar fashion to the pre-activated state of the device. As this
occurs, the binding member reset surface 107 comes into contact
with the hub reset surface 108. This action is depicted in the
embodiment shown in FIG. 14.
[0109] As the stylet 106 is advanced from a proximal-to-distal
direction, the hub reset surface 108 deflects the binding member
reset surface 107, along with the end sensing member 119, to a
position above the stylet 106 surface and urges the binding member
105 from the binding orientation to the sliding orientation. With
the binding member 105 in the sliding orientation, the stylet 106
becomes free to advance into the needle 103.
[0110] Concurrently, due to the contact between the hub reset
surface 108 and the binding member reset surface 107, the hub
retainer 114 is urged into the hub slot 124. This causes the hub
retainer 114 of the binding member 105 to again retain the needle
hub 104 to the safety shield 101 through the interaction with the
hub slot 124 (FIG. 15).
[0111] Upon being reset, the safety shield 101 and needle 103 are
positioned over the stylet 106. During the medical procedure, the
style 106 will be automatically protected by the safety shield 101
as the stylet 106 is again withdrawn from the needle.
[0112] FIGS. 16-27 illustrate the resettable safety shield
according to the present disclosure as applied to a bone biopsy
needle 101. In this embodiment, the luer taper 109 is used in the
manner described hereinbefore with respect to FIGS. 12-15. The bone
biopsy needle 101 may also include an adjustable depth stop
assembly 140 for setting the desired needle 103 insertion depth. A
lock nut 142 locks the depth stop assembly 140 in the desired
position. Tabs 144 engage corresponding slots 156 (shown in FIG.
25) to fix depth stop assembly 140 while the lock nut 142 is
engaged.
[0113] A needle shield 137 may be disposed in depth stop assembly
140 as illustrated in FIG. 17. Corresponding threads 148 and 150
disposed on depth stop assembly 140 and sleeve 151, respectively,
provide for threadable movement of depth stop assembly 140. Needle
shield 137 operates in similar fashion to shield 101 described in
FIGS. 1-11, as will be discussed in more detail hereafter.
[0114] The medical needle shield apparatus for stylet 106 includes
a binding member 105 that is disposed within a stylet shield 125,
similar to that described with regard to FIGS. 1-11, that is
extensible from a retracted position to an extended position to
enclose a distal end of a stylet 106 of a needle assembly. Stylet
106 is slideably and concentrically disposed with a needle 103 of
the needle assembly for employment therewith during a bone biopsy
needle application. A stylet handle 113 is connected to stylet
106.
[0115] In operation, the clinician (not shown) manipulates handle
113 such that shield 101 is in the retracted position (FIGS. 16,
18, 19) and binding member 105 is in a non-binding or sliding
position. Handle 113 may include a tab 152 for temporary securement
to hub 104. Hub 104 includes an opening (not shown) such that
handle 113 may be released from temporary securement as tab 152 is
rotated to align tab 152 with the opening. Stylet 106 is extended
relative to shield 101 such that needle hub 104 is disposed about
needle 103 and needle hub 104 is releasably mounted with bearing
102.
[0116] A procedure employing the medical needle shield apparatus
with stylet 106 and needle 103 is performed by the clinician to
completion.
[0117] Needle hub 104 is releasably mounted with stylet handle 113.
Referring to FIG. 22, stylet 106 is retracted proximally such that
shield 101 is extended to the extended position and binding member
105 is disposed in a binding position. Needle hub 104 is released
from stylet shield 125 in the extended position. This maintains
stylet 106 within stylet shield 125 to avoid hazardous exposure to
the distal end of stylet 106.
[0118] To re-access the stylet distal end 115 using the resettable
passive safety device, the stylet shield 125 is brought to mate
concentrically with the proximal end of the needle hub 104, in a
similar fashion to the pre-activated state of the device. As this
occurs, the binding member reset surface 107 comes into contact
with the hub reset surface 108. This action is depicted in the
embodiment shown in FIG. 23A.
[0119] As the stylet 106 is advanced from a proximal-to-distal
direction, the hub reset surface 108 deflects the binding member
reset surface 107, along with the end sensing member 119, to a
position above the stylet 106 surface and urges the binding member
105 from the binding orientation to the sliding orientation. With
the binding member 105 in the sliding orientation, the stylet 106
becomes free to advance into the needle 103.
[0120] Concurrently, due to the contact between the hub reset
surface 108 and the binding member reset surface 107, the hub
retainer 114 is urged into the hub slot 124. This causes the hub
retainer 114 of the binding member 105 to again retain the needle
hub 104 to the safety shield 101 through the interaction with the
hub slot 124.
[0121] Upon being reset, the stylet shield 125 and needle 103 are
positioned over the stylet 106, as seen in FIG. 16. During the
medical procedure, the style 106 will be automatically protected by
the stylet shield 125 as the stylet 106 is again withdrawn from the
needle.
[0122] FIG. 24 illustrates a syringe inserted into hub 104 for
aspiration purposes with stylet 106 removed.
[0123] FIG. 25 illustrates the resettable safety shield device 101
with the depth stop assembly 140 removed and the needle shield 137
in the retracted position. FIGS. 26-27 show the needle shield 137
in the shielded configuration. A binding member 105' is disposed
within needle shield 137 and defines binding surfaces (not shown).
Binding surfaces form an aperture configured for slidable receipt
of hollow needle 103 between the retracted position and the
extended position. Binding member 105' includes a drag inducing
member, such as, for example, friction members 126' extending
therefrom. Binding member 105' has a needle communicating surface
123' that is engageable with hollow needle 103 to prevent rotation
of binding member 105'.
[0124] Friction members 126' are configured for slidable engagement
with hollow needle 103 between the retracted position and the
extended position such that friction members 126' engage hollow
needle 103 to create a drag force with hollow needle 103. It is
envisioned that one or a plurality of friction members 126' may be
employed.
[0125] The drag force in conjunction with one of blocking members
116' and/or 117', cause binding member 105' to move to a binding
position (FIG. 27). The force created by blocking members 116'
and/or 117' acts in a direction opposite to the drag force. This
causes a force couple, which moves binding member 105' to the
binding position.
[0126] A funnel portion 146 in needle shield 137 acts as a probe
guide to facilitate insertion of a shepherd's hook or the like.
Depth stop 140 may be slideably removed with safety shield 137
remaining in the proximal position. This allows a clinician to
utilize the entire length of needle 103. As shown, depth stop 140
is removed prior to activation of safety shield 137. Alternatively,
safety shield 137 may be connect to, or formed as part of, the
depth stop 140.
[0127] FIGS. 28-29 illustrate the resettable safety shield device
according to the present disclosure as applied to a PICC introducer
or similar catheter and needle introducers. In this embodiment, the
hollow needle 103 is polymeric, and the stylet (or inner needle)
106 is a sharp, hollow bore cannula. The handle 113 of the PICC
Introducer has a flash plug 135 and a flash chamber 136 that is in
communication with inner needle 106. A luer fitting 121
communicates with the flash chamber 136 and allows the fitting of
other medical devices.
[0128] The medical needle shield apparatus includes a shield 101,
similar to those described, that is extensible from a retracted
position (FIG. 28) to an extended position (FIGS. 31-32) to enclose
a distal end of hollow needle 103 of a needle assembly. Hollow
needle 103 is slideably and concentrically disposed with a hub 104
(FIG. 28) of the needle assembly for employment therewith during a
PICC introducer application. Hub 104 may, or may not, be splitable.
Hub 104 is desirably fabricated from a polymeric material. It is
contemplated that the medical needles of the present disclosure may
incorporate a protective needle sheath member to facilitate
additional protection during transportation and use of the medical
needles.
[0129] A handle 113 is connected to inner needle 106. Handle 113
may have a flash chamber 139 in communication with inner needle
106. A luer fitting 121 communicates with flash chamber 139 that
facilitates connection to various medical devices via either a luer
slip or luer lock attachment feature.
[0130] A binding member 105, similar to that described with regard
to FIGS. 1-11, is disposed within shield 101. Shield 101 includes a
bearing 102 that houses binding member 105.
[0131] Needle hub 104 is mounted with hollow needle 103. Needle hub
104 is releasably mounted with shield 101 via releasable engagement
with a retainer 114 of binding member 105. Needle hub 104 has a hub
slot 124 for receipt and engagement with binding member 105. This
configuration facilitates removal and use of hub 104 from shield
101 during a medical needle application.
[0132] A flange of needle hub 104 is concentrically supported by a
control surface of a stylet shield 125, discussed below. The
control surface engages the flange for releasable support thereof.
Retainer 114 extends for receipt within a hub slot 124 of needle
hub 104. In association with a non-binding or sliding orientation
of binding member 105, retainer 114 is disposed within hub slot 124
for releasably mounting with shield 101. As inner needle 106 is
retracted and shield 101 is extended, retainer 114 rotates in a
counter clockwise direction and disengages from hub slot 124 to
release needle hub 104 from stylet shield 125.
[0133] A stylet shield 125 is disposed for rotation and enclosure
of the distal end of inner needle 106. Stylet shield 125 is mounted
with handle 113 and freely rotates relative to shield 101 and inner
needle 106 in the extended position of shield 101. Relative
rotation of stylet shield 125 is facilitated by support at bearing
openings formed in stylet shield 125 and axles, similar to those
described above. In a binding position, the bearing configuration
supports rotation of stylet shield 125 relative to shield 101 and
inner needle 106.
[0134] Inner needle 106 is retracted proximally such that shield
101 is extended to the extended position and binding member 105 is
disposed in a binding position. Needle hub 104 is released from
shield 101 and shield 101 encloses the distal end of needle 103 in
the extended position. This maintains needle 103 within shield 101
to avoid hazardous exposure to the distal end of needle 103.
[0135] In operation, needle hub 104 is released from shield 101 and
a stylet shield 125 encloses the distal end of inner needle 106 in
the extended position, as described above. This maintains inner
needle 106 within shield 101 to avoid hazardous exposure to the
distal end thereof.
[0136] To re-access the inner needle 106 using the resettable
passive safety device, the stylet shield 125 of the rotating
focusing is brought to mate concentrically with the proximal end of
the needle hub 104, in a similar fashion to the pre-activated state
of the device. As this occurs, the binding member reset surface
107, on the end sensing member 119, comes into contact with the hub
reset surface 108. This action is depicted in the embodiment shown
in FIGS. 30 and 33.
[0137] As the inner needle 106 is advanced from a
proximal-to-distal direction, the hub reset surface 108 deflects
the binding member reset surface 107, along with the end sensing
member 119, to a position above the inner needle 106 surface and
urges the binding member 105 from the binding orientation to the
sliding orientation. With the binding member 105 in the sliding
orientation, the inner needle 106 becomes free to advance into
hollow needle 103.
[0138] Concurrently, due to the contact between the hub reset
surface 108 and the binding member reset surface 107, the hub
retainer 114 is urged into the hub slot 124. This causes the hub
retainer 114 of the binding member 105 to again retain the needle
hub 104 to the safety shield 101 through the interaction with the
hub slot 124.
[0139] Upon being reset, the safety shield 101 and hollow needle
103 are positioned over the inner needle 106, as seen in FIG. 28.
During the medical procedure, the inner needle 106 will be
automatically protected by the safety shield 101 as the inner
needle 106 is again withdrawn from the needle.
[0140] FIGS. 34-37 illustrate the resettable safety shield device
according to the present disclosure as applied to a port access
device or implanted pump. It is contemplated herein that the port
access device may be implanted or exterior to a patient. Operation
and construction of this embodiment is in accordance with the
various embodiments described herein such as for example the
embodiments disclosed in FIGS. 1-11. FIGS. 34-37 show an implanted
port 127 and skin layer 129 along with an implanted port access
body 130. The port access body contains the hub reset surface 108.
In the present embodiment, the stylet 106 is protected by the
safety shield 101 before use. Hub reset surface 108 and binding
member reset surface 107 reset the safety device as described
hereinbefore to allow stylet 106 to pass through the skin layer 129
and enter the implanted port 127. The safety shield device
reactivates upon removal of stylet 106 from the implanted port
access body 130.
[0141] With reference to FIGS. 38-41, illustrated is a resettable
safety shield device according to the present disclosure as applied
to a drug vial access. Operation and construction of this
embodiment is in accordance with the various embodiments described
herein such as for example the embodiments disclosed in FIGS. 1-11.
FIGS. 38-41 show a drug vial 131 along with a corresponding drug
vial access body 134. Stylet 106 is protected by a safety shield
101 before use. Hub reset surface 108 engages binding member reset
surface 107 to allow stylet 106 to enter drug vial 131. The safety
device re-activates upon removal of stylet 106 from drug vial
access body 134.
[0142] The invention of the present disclosure may be embodied in
other specific forms without departing from the spirit or essential
characteristics thereof. The present embodiments are therefore to
be considered in all respects as illustrative and not restrictive,
the scope of the invention being indicated by the appended claims
rather than by the foregoing description, and all changes which
come within the meaning and range of equivalency of the claims are
therefore intended to be embraced therein.
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