WO2014210066A1 - Apparatus for hanging drop detection of epidural space penetration - Google Patents

Apparatus for hanging drop detection of epidural space penetration Download PDF

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Publication number
WO2014210066A1
WO2014210066A1 PCT/US2014/043955 US2014043955W WO2014210066A1 WO 2014210066 A1 WO2014210066 A1 WO 2014210066A1 US 2014043955 W US2014043955 W US 2014043955W WO 2014210066 A1 WO2014210066 A1 WO 2014210066A1
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WO
WIPO (PCT)
Prior art keywords
stylet
needle
hub
hub assembly
lumen
Prior art date
Application number
PCT/US2014/043955
Other languages
French (fr)
Inventor
Thomas A. SENATORE
Original Assignee
Senatore Thomas A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Senatore Thomas A filed Critical Senatore Thomas A
Priority to EP14817208.3A priority Critical patent/EP3021892A4/en
Publication of WO2014210066A1 publication Critical patent/WO2014210066A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3401—Puncturing needles for the peridural or subarachnoid space or the plexus, e.g. for anaesthesia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0102—Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/158—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3293—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles characterised by features of the needle hub
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/42—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for desensitising skin, for protruding skin to facilitate piercing, or for locating point where body is to be pierced
    • A61M5/427—Locating point where body is to be pierced, e.g. vein location means using ultrasonic waves, injection site templates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/46—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for controlling depth of insertion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00477—Coupling
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/158—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
    • A61M2005/1587—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body suitable for being connected to an infusion line after insertion into a patient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/13—General characteristics of the apparatus with means for the detection of operative contact with patient, e.g. lip sensor

Definitions

  • the invention relates to the field of epidural needles and anesthesia.
  • One embodiment of the invention provides a hub and needle apparatus for detecting penetration of the needle into a negative pressure space, such as the epidural space, which includes:
  • an elongate needle having a proximal end, a distal penetration end and a longitudinal axis, wherein a lumen extends lengthwise through the needle and opens at each end of the needle; and a hub assembly having a proximal end and a distal end, the hub assembly including: a lumen formed by the hub assembly, a proximal end portion of the needle connected to the distal end of the hub assembly with the lumens of the needle and hub assembly in fluid communication with each other,
  • a stylet port disposed at the proximal end of the hub assembly, the stylet port communicating with the lumen of the hub assembly and having a longitudinal axis which is coaxial with the longitudinal axis of the needle at the needle's proximal end;
  • a moveable plunger sealably engaging the fluid reservoir chamber.
  • the hub and needle apparatus may further include:
  • a fluid redirection member rotatably and removably connected to the stylet port of the hub assembly, the fluid redirection member having a lumen opening on one side into the lumen of the hub assembly when connected to the stylet port and opening to the exterior in a direction transverse to the longitudinal axis of the stylet port.
  • the hub and needle apparatus may further include:
  • a separate stylet that includes:
  • an elongate stylet member having a proximal end and a distal insertion end; and a stylet handle connected to the proximal end of the stylet member, the stylet handle including an outward-facing fluid connection port,
  • the stylet and the hub assembly are mutually sized and configured so that when the stylet is fully inserted into the hub assembly, the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked, and
  • the fluid reservoir chamber(s) may be at least substantially filled with liquid with the plunger disposed therein outwardly displaced from its fully inserted position so that it can be inserted to displace the liquid from the chamber.
  • the invention further provides kits that include a hub and needle apparatus of the invention along with a mutually sized and configured stylet for use therewith.
  • a still further embodiment of the invention provides a specialized stylet, which includes:
  • an elongate stylet member having a proximal end, a distal insertion end, a central longitudinal axis and an outer diameter
  • a stylet handle having a proximal side and a distal side, the distal side of the stylet handle connected to the proximal end of the stylet member and the stylet handle including a proximally- facing fluid connection port forming a lumen, said lumen extending via a passage through to the distal side of the stylet handle,
  • the average exterior dimension of the stylet handle transverse to the central longitudinal axis of the elongate stylet member is greater than the outer diameter of the stylet member.
  • the invention also provides methods for detecting the penetration of a needle into a negative pressure space, such as the epidural space, and for inserting the needle therein, that employ the hub and needle apparatuses described herein.
  • FIG. 1 schematically shows a longitudinal cross-section of a hub and needle embodiment of the invention.
  • FIG. 2 shows a perspective view of stylet embodiment of the invention that may be used with the hub and needle embodiment shown in FIG. 1.
  • FIG. 3 schematically shows a longitudinal cross-section of the hub and needle embodiment shown in FIG. 1 with the mutually sized and configured stylet embodiment of FIG. 2 fully inserted and seated in the hub and needle apparatus.
  • FIGS 4A-D schematically show in longitudinal cross-sections steps in preparing and using the embodiments shown in FIGS. 1-3 for the detection of needle penetration into the epidural space.
  • FIG. 5 schematically shows a safety mechanism that may be built into the hub and needle apparatuses to prevent inadvertent depression of a push plunger.
  • FIG. 6 schematically shows another safety mechanism that may be built into the hub and needle apparatuses to prevent inadvertent depression of a push plunger.
  • the invention provides improved hub and needle apparatuses for the detection of needle penetration into negative pressure spaces, such as the epidural space, by a hanging drop aspiration technique.
  • the hubs of the invention include one or more fluid reservoir chambers each engaging a plunger, so that insertion of a plunger into a chamber displaces a fluid, such as saline, causing a hanging drop to form.
  • One embodiment of the invention provides a hub and needle apparatus for detecting penetration of the needle into a negative pressure space, such as the epidural space, which includes:
  • an elongate needle having a proximal end, a distal penetration end and a longitudinal axis, wherein a lumen extends lengthwise through the needle and opens at each end of the needle;
  • a hub assembly having a proximal end and a distal end, the hub assembly including: a lumen formed by the hub assembly, a proximal end portion of the needle connected to the distal end of the hub assembly with the lumens of the needle and hub assembly in fluid communication with each other,
  • a stylet port disposed at the proximal end of the hub assembly, the stylet port communicating with the lumen of the hub assembly and having a longitudinal axis which is coaxial with the longitudinal axis of the needle at the needle's proximal end;
  • a moveable plunger sealably engaging (inserted in) the fluid reservoir chamber.
  • the hub and needle apparatus may further include: a fluid redirection member rotatably and removably connected to the stylet port of the hub assembly, the fluid redirection member having a lumen opening on one side into the lumen of the hub assembly when connected to the stylet port and opening to the exterior in a direction transverse to the longitudinal axis of the stylet port.
  • the hub and needle apparatus may further include:
  • a separate stylet that includes:
  • an elongate stylet member having a proximal end and a distal insertion end; and a stylet handle connected to the proximal end of the stylet member, the stylet handle including an outward-facing fluid connection port,
  • the stylet and the hub assembly are mutually sized and configured so that when the stylet is fully inserted into the hub assembly, the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked, and
  • the fluid reservoir chamber(s) may be at least substantially filled with liquid with the plunger disposed therein outwardly displaced from its fully inserted position so that it can be inserted to displace the liquid from the chamber.
  • kits that include a hub and needle apparatus of the invention along with a mutually sized and configured stylet for use therewith.
  • kits for detecting the penetration of a needle into a negative pressure space, such as the epidural space which includes:
  • a hub and needle apparatus including:
  • an elongate needle having a proximal end, a distal penetration end and a longitudinal axis, wherein a lumen extends lengthwise through the needle and opens at or near each end of the needle;
  • a hub assembly having a proximal end and a distal end, the hub assembly including: a lumen formed by the hub assembly, a proximal end portion of the needle connected to the distal end of the hub assembly with the lumens of the needle and hub assembly in fluid communication with each other,
  • a stylet port disposed at the proximal end of the hub assembly, the stylet port communicating with the lumen of the hub assembly and having a longitudinal axis which is coaxial with the longitudinal axis of the needle at the needle's proximal end,
  • a stylet including:
  • an elongate stylet member having a proximal end and a distal insertion end
  • a stylet handle connected to the proximal end of the stylet member, the stylet handle comprising an outward- facing fluid connection port,
  • the stylet and the hub assembly are mutually sized and configured so that when the stylet is fully inserted into the hub assembly, the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked.
  • the stylet may be preinserted into the hub and needle apparatus in the kit or it may be provided not inserted in the hub and needle apparatus, i.e., separate and apart, in the kit.
  • the kit may further include:
  • a fluid redirection member sized and configured to rotatably and removably connect to the stylet port of the hub and needle assembly, the fluid redirection member having a lumen opening on one side into the lumen of the hub assembly when connected to the stylet port and opening to the exterior in a direction transverse to the longitudinal axis of the stylet port.
  • a still further embodiment of the invention provides a specialized stylet, which includes:
  • an elongate stylet member having a proximal end, a distal insertion end, a central longitudinal axis and an outer diameter; and a stylet handle having a proximal side and a distal side, the distal side of the stylet handle connected to the proximal end of the stylet member and the stylet handle including a proximally- facing fluid connection port forming a lumen, said lumen extending via a passage through to the distal side of the stylet handle,
  • the average exterior dimension of the stylet handle transverse to the central longitudinal axis of the elongate stylet member is greater than the outer diameter of the stylet member.
  • the proximally- facing fluid connection port of the stylet handle may be secured to and fluidly connected with the distal end of a syringe, such as a saline filled syringe.
  • the proximally-facing fluid connection port of the stylet handle may present a conically tapered recess for a tapered fit connection.
  • it may present a female Luer connector fitting.
  • a syringe having a conically tapered protrusion connector (such as a corresponding male Luer fitting) sized and configured to form a tapered fit connection with the conically tapered recess presented by the stylet handle, may be reversibly connected to the stylet via the complementary tapers.
  • Stylet handles having fluid communication between a proximal-side fluid connection port and the distal side of the stylet handle via one or more passages/holes may optionally have one or more one-way valves interposed therein, such as one-way micro-valves known in the art, permitting proximal to distal liquid flow.
  • FIG. 1 schematically shows a longitudinal cross-section of a hub and needle embodiment 100 of the invention that includes a hub 101, which is a type of manifold, and a hollow needle 102.
  • the proximal end of needle 102 is securably inserted into and surrounded by the distal end of hub 101.
  • the longitudinal lumen of needle 102 extends proximally into a longitudinal lumen section 103 formed by the hub and continues further proximally into longitudinal lumen section 104 formed by conical stylet seating portion 105 of the hub, eventually opening proximally into the proximal port (proximal stylet port) space 106 of hub 101.
  • the inner dimension of proximal port 106 has a circular profile.
  • first and second opposing fluid reservoir chambers (barrels) 107A and 107B Disposed transverse, here perpendicular, to the central longitudinal axes of the needle and hub are first and second opposing fluid reservoir chambers (barrels) 107A and 107B formed by hub 101 which outwardly open to the exterior but for plungers 108A and 108B inserted therein.
  • Fluid reservoir chambers 107A and 107B are shown with a circular cross-sectional profile but may have any shaped profile so long as the plungers are mutually sized and configured.
  • each plunger may include a radially protruding circumferential seal 109.
  • the plunger(s) may user other type of annular seals such as O-ring seals, such as those known in the art.
  • Fluid redirection member 110 is a tubular elbow member sized and configured to slideably and rotatably (about the central longitudinal axis of hub 101) fit at one end into proximal port 106. As shown in the figure, the lumens formed between the end of the plungers and the respective fluid reservoirs chambers continue proximally into the interior space of the proximal stylet port portion of the hub.
  • FIG. 2 shows a perspective view of a stylet embodiment of the invention 200 that may be used with the hub and needle embodiment shown in FIG. 1.
  • Stylet 200 includes an elongated stylet member 201 connected at its proximal end to a stylet handle (cap) 203.
  • the proximal end of stylet handle 203 forms and presents a connector 204, such as a Luer connector such as Luer slip or Luer lock type (female geometry shown) for connection to a mutually sized and configured syringe or other filling device.
  • a Luer connector such as Luer slip or Luer lock type (female geometry shown) for connection to a mutually sized and configured syringe or other filling device.
  • FIG. 3 schematically shows a longitudinal cross-section of the assembly 300 of the hub and needle embodiment shown in FIG. 1 with the mutually sized and configured stylet embodiment of FIG. 2 fully inserted into and seated in the hub and needle apparatus.
  • the proximal end of elongate stylet member 201 is connected to the distal stylet connecting portion 208 of stylet handle 203.
  • the outer radius of distal stylet connecting portion 208 of stylet handle 203 is not large enough to not block off the lumen that extends proximally from the fluid reservoir chambers.
  • the distal-most portion of distal stylet connecting portion 208 is sized and configured to abut the proximal face of conical stylet seating portion 105 of hub 101.
  • Portion 206 of stylet handle 203 sealingly surrounds the proximal stylet port portion of hub 101.
  • Stylet handle 203 has formed therein one or more passageways, here two, 209A and 209B that fluidly connect the inner volume of connector portion 204 to the continuous lumen including and extending proximally from the fluid reservoir chambers of hub 101.
  • the plungers shown in the figures are push plungers.
  • one or more or all of the plungers could be screw plungers having threads that engage with corresponding internal threads of the fluid reservoir chamber such that the practitioner screw inserts the plunger(s) to displace the fluid in the chamber(s).
  • the invention also provides methods of preparing the apparatuses for use, methods for detecting the penetration of a needle into a negative pressure space, such as the epidural space, using the apparatuses and methods for inserting the needle into the space using the apparatuses.
  • the hub and needle apparatuses of the invention may, for example, be provided by the manufacturer for use in sterile form prefilled with saline with the one or more plungers displaced outwardly from their fully inserted positions, ready to be pressed inward (or otherwise advanced inward) during the procedure to obtain the hanging drop.
  • a stylet may also be pre-inserted.
  • the stylet may be a conventional stylet (without a proximal end connection port communicating with the distal side of the stylet handle) or it may be the manner of stylet described herein which presents a proximal end connection port (for connection to a syringe) having a lumen in fluid communication with the distal side of the stylet handle and hub assembly lumen when the stylet is inserted into the hub and needle apparatus.
  • the proximal port of the stylet handle may be closed with a cap/plug, such as a removable cap/plug, sized and configured to sealably engage the port.
  • the stylet port presents a female Luer connector
  • the cap may present a
  • the hub and needle apparatus may be supplied dry, i.e., unfilled with saline or other liquid, to be filled for use by the anesthesia personnel prior to use.
  • the hub and needle apparatus may be supplied with the stylet having the proximal port in fluid communication with its distal side already fully inserted into the hub and needle apparatus.
  • the proximal port of the stylet may or may not be provided with a cap/plug reversibly closing it.
  • the one or more plungers may be provided in a closed (fully inserted position), an open position or an intermediate position.
  • FIG.4A The filling of the hub and needle apparatus with inserted stylet (having a proximal port in fluid communication with the distal end of the stylet handle) using a saline filled syringe is shown in FIG.4A.
  • the plunger(s) may be initially disposed in a fully inserted position and be displaced outwardly as pressure form the syringe fills the fluid reservoir chambers. This method minimizes the air trapped in the syringe that needs to escape during filling. It should also be understood that the lumen of the hub assembly may also be filled under a vacuum/partial vacuum.
  • the syringe is thereafter removed and the filled hub and needle apparatus with inserted stylus remaining is then inserted to just outside the epidural space (FIG. 4B), such as in a typical epidural procedure.
  • the epidural needle is inserted into the ligamentum flavum.
  • Anatomical structures traversed include skin, subcutaneous tissue, supraspinous ligament, and interspinous ligament.
  • the depth of skin to ligamentum flavum is approximately 4 cm for most adults. Eighty percent of adults have a skin to ligamentum flavum depth of 3.5 - 6 cm.
  • the average thickness of the ligamentum flavum is 5 -6 mm.
  • Controlling the needle is important to avoid a dural puncture. In the thoracic area, needle control is important to avoid dural puncture and risk of spinal cord injury.
  • a fluid redirection member e.g. an elbow tube
  • One of the plungers of the apparatus is then depressed to displace the saline in the reservoir chamber to create (bring up) a hanging drop at the proximal stylet port of the hub (FIG. 4D).
  • the needle is then carefully advanced further toward the epidural space until aspiration of the hanging drop indicates that the distal end of the needle has entered the epidural space.
  • the anesthesia practitioner does not need to remove their hands from the apparatus to fill the hub with another syringe in order to obtain the hanging drop during the procedure as they would using a conventional hanging drop technique.
  • the embodiment shown in FIGS. 4A-D is a two-plunger apparatus, should the first hanging drop formed be inadvertently lost or aspirated due to a false positive drop in pressure, the practitioner can simply depress the second plunger to form a new hanging drop.
  • Each plunger may also be capable of setting up more than one hanging drops depending on the volume of the fluid reservoir chamber.
  • fine tuning of the needle position may optionally be performed according to practitioner preference and a catheter may be inserted through the needle into the epidural space for delivery of anesthesia and/or other medicaments.
  • the apparatuses of the present invention are advantageously adapted to carry out the manner of hanging drop technique described herein, they may also be used in a variation of the loss of resistance technique by applying constant inward pressure to one or more plungers after the stylet is removed and while the needle is advanced toward the epidural space, until loss of resistance is sensed on the plunger(s) indicating penetration of the distal tip of the needle into the epidural space.
  • a cap or plug may be secured to the stylet port of the hub assembly after the style is removed and prior to the advance in order to seal pressure within the lumen of the needle hub.
  • This loss of resistance method may, for example be performed with the lumen of the needle hub only air/gas filled (or at least substantially air/gas filled) or liquid filled, such as saline filled.
  • the loss of resistance method is not sensitive to the orientation of the patient during the procedure.
  • FIG. 5 schematically shows a safety mechanism that may be built into the hub and needle apparatuses to prevent inadvertent depression of a push plunger.
  • FIG. 5 (top) shows fluid reservoir chamber 507 of a hub and needle apparatus similar to that shown in FIG. 1 except that a nub 517 extends radially inward from only part of the circumference of the wall of the chamber.
  • the shaft of plunger 508 presents a radially outward extending nub 518.
  • nub 517 blocks nub 518 preventing the plunger from depressing.
  • the plunger When the plunger is rotated about the central axis of the plunger so that the paths of nubs 517 and 518 no longer overlap (FIG. 5 bottom), the plunger may be depressed.
  • the apparatus Before the needle is inserted into a patient, the apparatus may be provided in the locked position and switched to the unlocked position by rotating the plunger when the practitioner desires to form the hanging drop.
  • FIG. 6 schematically shows another safety mechanism that may be built into the hub and needle apparatuses to prevent inadvertent depression of a push plunger.
  • a partial circumferential section 617 of fluid reservoir chamber 607 extends farther outward than the rest of the chamber.
  • the press top of plunger 608 is configured with a cutout sized and configured to permit section 617 to pass upon depressing the plunger when the cutout and section 617 are circumferentially coaligned and to block the plunger when not coaligned.
  • the apparatus may be provided in the locked position and switched to the unlocked position by rotating the plunger when the practitioner desires to form the hanging drop.
  • the plunger and hub may be mutually sized and configured to selectively permit depression of the plunger based on the rotational position of the plunger about its central rotational axis.
  • the needle component of the hub and needle apparatuses of the invention may have any suitable configuration.
  • suitable types of needles for performing epidural procedures include the Tuohy needle, the Crawford needle and the Whitacre needle. Needle sizes are well known in the art and selection may vary, for example, based on age of the patient (child or adult). In general, 16-20 gauge needles may be used.
  • the various components of the invention may be made of any suitable materials.
  • the hub and stylet handle may be made from a medical grade polymer such as a polyethylene, polypropylene or acrylic.
  • the hub and stylet handle may be metallic.
  • the needle of the hub and needle apparatus may be metallic such as made from a stainless steel.
  • the elongate stylet member may be metallic or polymeric. Both polymeric and metallic components may be manufactured using means well known in the art such as molding, injection molding, machining, welding, joining with adhesives and combinations thereof.
  • Various components such as the hub and stylet handle may also be manufactured using three-dimensional (3D) printing techniques, as known in the art.
  • the fluid redirection member and/or at least the stylet port portion of the hub body may be transparent to facilitate visualization of the aspiration of the hanging drop and column of liquid beneath it upon penetration of the epidural space.

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Abstract

The invention provides improved apparatuses and related methods for the detection of needle penetration into negative pressure corporal spaces such as the epidural space. In one aspect, the invention provides a needle hub that includes a fluid reservoir chamber and a plunger engaged therewith so that insertion of the plunger into the chamber displaces fluid causing a hanging drop to form.

Description

APPARATUS FOR HANGING DROP DETECTION OF EPIDURAL SPACE
PENETRATION
CROSS-REFERENCE TO RELATED APPLICATIONS
[001] This application claims the benefit of U.S. provisional application serial no.
61/838,786 filed June 24, 2013, which is hereby incorporated by reference in its entirety.
FIELD OF THE INVENTION
[002] The invention relates to the field of epidural needles and anesthesia.
BACKGROUND OF THE INVENTION
[003] Epidural anesthesia is a popular method of treating acute and chronic pain. Most commonly, the "loss of resistance" (LOR) technique has been used to detect needle penetration into the space. This technique involves connecting the needle, such as a Tuohy needle, via a needle hub to a syringe filled with saline solution and continuously pushing on the piston of the syringe while the needle is inserted toward the epidural space until a loss of resistance is encountered indicating that the needle tip has entered the space. An alternative method of detection is the "hanging drop" (HD) technique which relies on visualizing the aspiration of a small volume of fluid from the hub of the needle as the pressure at the needle tip decreases below atmospheric level upon entry into the epidural space. However, conventional application of the hanging drop technique is less than optimal due to the number of manipulations required while the needle is inserted in a patient.
[004] What is needed and provided by the present invention are new and improved apparatuses and methods for detecting needle penetration into a negative pressure
(subatmo spheric) space such as the epidural space.
SUMMARY OF THE INVENTION
[005] One embodiment of the invention provides a hub and needle apparatus for detecting penetration of the needle into a negative pressure space, such as the epidural space, which includes:
an elongate needle having a proximal end, a distal penetration end and a longitudinal axis, wherein a lumen extends lengthwise through the needle and opens at each end of the needle; and a hub assembly having a proximal end and a distal end, the hub assembly including: a lumen formed by the hub assembly, a proximal end portion of the needle connected to the distal end of the hub assembly with the lumens of the needle and hub assembly in fluid communication with each other,
a stylet port disposed at the proximal end of the hub assembly, the stylet port communicating with the lumen of the hub assembly and having a longitudinal axis which is coaxial with the longitudinal axis of the needle at the needle's proximal end;
a fluid reservoir chamber in communication with the lumen of the hub assembly; and
a moveable plunger sealably engaging the fluid reservoir chamber.
[006] The hub and needle apparatus may further include:
a fluid redirection member rotatably and removably connected to the stylet port of the hub assembly, the fluid redirection member having a lumen opening on one side into the lumen of the hub assembly when connected to the stylet port and opening to the exterior in a direction transverse to the longitudinal axis of the stylet port.
[007] The hub and needle apparatus may further include:
a separate stylet that includes:
an elongate stylet member having a proximal end and a distal insertion end; and a stylet handle connected to the proximal end of the stylet member, the stylet handle including an outward-facing fluid connection port,
wherein the stylet and the hub assembly are mutually sized and configured so that when the stylet is fully inserted into the hub assembly, the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked, and
wherein the stylet is fully inserted into the hub assembly such that the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly and fluid communication with the proximal opening of the elongate needle is blocked.
[008] The fluid reservoir chamber(s) may be at least substantially filled with liquid with the plunger disposed therein outwardly displaced from its fully inserted position so that it can be inserted to displace the liquid from the chamber. [009] The invention further provides kits that include a hub and needle apparatus of the invention along with a mutually sized and configured stylet for use therewith.
[0010] A still further embodiment of the invention provides a specialized stylet, which includes:
an elongate stylet member having a proximal end, a distal insertion end, a central longitudinal axis and an outer diameter; and
a stylet handle having a proximal side and a distal side, the distal side of the stylet handle connected to the proximal end of the stylet member and the stylet handle including a proximally- facing fluid connection port forming a lumen, said lumen extending via a passage through to the distal side of the stylet handle,
wherein the average exterior dimension of the stylet handle transverse to the central longitudinal axis of the elongate stylet member is greater than the outer diameter of the stylet member.
[0011] The invention also provides methods for detecting the penetration of a needle into a negative pressure space, such as the epidural space, and for inserting the needle therein, that employ the hub and needle apparatuses described herein.
[0012] Additional features, advantages, and embodiments of the invention may be set forth or apparent from consideration of the following detailed description, drawings, and claims. Moreover, it is to be understood that both the foregoing summary of the invention and the following detailed description are exemplary and intended to provide further explanation without limiting the scope of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 schematically shows a longitudinal cross-section of a hub and needle embodiment of the invention.
[0014] FIG. 2 shows a perspective view of stylet embodiment of the invention that may be used with the hub and needle embodiment shown in FIG. 1.
[0015] FIG. 3 schematically shows a longitudinal cross-section of the hub and needle embodiment shown in FIG. 1 with the mutually sized and configured stylet embodiment of FIG. 2 fully inserted and seated in the hub and needle apparatus. [0016] FIGS 4A-D schematically show in longitudinal cross-sections steps in preparing and using the embodiments shown in FIGS. 1-3 for the detection of needle penetration into the epidural space.
[0017] FIG. 5 schematically shows a safety mechanism that may be built into the hub and needle apparatuses to prevent inadvertent depression of a push plunger.
[0018] FIG. 6 schematically shows another safety mechanism that may be built into the hub and needle apparatuses to prevent inadvertent depression of a push plunger.
DETAILED DESCRIPTION OF THE INVENTION
[0019] The invention provides improved hub and needle apparatuses for the detection of needle penetration into negative pressure spaces, such as the epidural space, by a hanging drop aspiration technique. In one aspect, the hubs of the invention include one or more fluid reservoir chambers each engaging a plunger, so that insertion of a plunger into a chamber displaces a fluid, such as saline, causing a hanging drop to form.
[0020] One embodiment of the invention provides a hub and needle apparatus for detecting penetration of the needle into a negative pressure space, such as the epidural space, which includes:
an elongate needle having a proximal end, a distal penetration end and a longitudinal axis, wherein a lumen extends lengthwise through the needle and opens at each end of the needle; and
a hub assembly having a proximal end and a distal end, the hub assembly including: a lumen formed by the hub assembly, a proximal end portion of the needle connected to the distal end of the hub assembly with the lumens of the needle and hub assembly in fluid communication with each other,
a stylet port disposed at the proximal end of the hub assembly, the stylet port communicating with the lumen of the hub assembly and having a longitudinal axis which is coaxial with the longitudinal axis of the needle at the needle's proximal end;
a fluid reservoir chamber in communication with the lumen of the hub assembly; and
a moveable plunger sealably engaging (inserted in) the fluid reservoir chamber.
[0021] The hub and needle apparatus may further include: a fluid redirection member rotatably and removably connected to the stylet port of the hub assembly, the fluid redirection member having a lumen opening on one side into the lumen of the hub assembly when connected to the stylet port and opening to the exterior in a direction transverse to the longitudinal axis of the stylet port.
[0022] The hub and needle apparatus may further include:
a separate stylet that includes:
an elongate stylet member having a proximal end and a distal insertion end; and a stylet handle connected to the proximal end of the stylet member, the stylet handle including an outward-facing fluid connection port,
wherein the stylet and the hub assembly are mutually sized and configured so that when the stylet is fully inserted into the hub assembly, the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked, and
wherein the stylet is fully inserted into the hub assembly such that the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly and fluid communication with the proximal opening of the elongate needle is blocked.
[0023] The fluid reservoir chamber(s) may be at least substantially filled with liquid with the plunger disposed therein outwardly displaced from its fully inserted position so that it can be inserted to displace the liquid from the chamber.
[0024] The invention further provides kits that include a hub and needle apparatus of the invention along with a mutually sized and configured stylet for use therewith.
[0025] One embodiment of the invention provides a kit for detecting the penetration of a needle into a negative pressure space, such as the epidural space, which includes:
(i) a hub and needle apparatus including:
an elongate needle having a proximal end, a distal penetration end and a longitudinal axis, wherein a lumen extends lengthwise through the needle and opens at or near each end of the needle; and
a hub assembly having a proximal end and a distal end, the hub assembly including: a lumen formed by the hub assembly, a proximal end portion of the needle connected to the distal end of the hub assembly with the lumens of the needle and hub assembly in fluid communication with each other,
a stylet port disposed at the proximal end of the hub assembly, the stylet port communicating with the lumen of the hub assembly and having a longitudinal axis which is coaxial with the longitudinal axis of the needle at the needle's proximal end,
a fluid reservoir chamber in communication with the lumen of the hub assembly, and
a moveable plunger sealably engaging (inserted in) the fluid reservoir chamber; and
(ii) a stylet including:
an elongate stylet member having a proximal end and a distal insertion end; and
a stylet handle connected to the proximal end of the stylet member, the stylet handle comprising an outward- facing fluid connection port,
wherein the stylet and the hub assembly are mutually sized and configured so that when the stylet is fully inserted into the hub assembly, the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked.
[0026] The stylet may be preinserted into the hub and needle apparatus in the kit or it may be provided not inserted in the hub and needle apparatus, i.e., separate and apart, in the kit.
[0027] The kit may further include:
a fluid redirection member sized and configured to rotatably and removably connect to the stylet port of the hub and needle assembly, the fluid redirection member having a lumen opening on one side into the lumen of the hub assembly when connected to the stylet port and opening to the exterior in a direction transverse to the longitudinal axis of the stylet port.
[0028] A still further embodiment of the invention provides a specialized stylet, which includes:
an elongate stylet member having a proximal end, a distal insertion end, a central longitudinal axis and an outer diameter; and a stylet handle having a proximal side and a distal side, the distal side of the stylet handle connected to the proximal end of the stylet member and the stylet handle including a proximally- facing fluid connection port forming a lumen, said lumen extending via a passage through to the distal side of the stylet handle,
wherein the average exterior dimension of the stylet handle transverse to the central longitudinal axis of the elongate stylet member is greater than the outer diameter of the stylet member.
[0029] The proximally- facing fluid connection port of the stylet handle may be secured to and fluidly connected with the distal end of a syringe, such as a saline filled syringe. The proximally-facing fluid connection port of the stylet handle may present a conically tapered recess for a tapered fit connection. For example, it may present a female Luer connector fitting. A syringe having a conically tapered protrusion connector (such as a corresponding male Luer fitting) sized and configured to form a tapered fit connection with the conically tapered recess presented by the stylet handle, may be reversibly connected to the stylet via the complementary tapers. Stylet handles having fluid communication between a proximal-side fluid connection port and the distal side of the stylet handle via one or more passages/holes may optionally have one or more one-way valves interposed therein, such as one-way micro-valves known in the art, permitting proximal to distal liquid flow.
[0030] Various aspects of the invention and its embodiments are still further described below with respect to the appended drawings.
[0031] FIG. 1 schematically shows a longitudinal cross-section of a hub and needle embodiment 100 of the invention that includes a hub 101, which is a type of manifold, and a hollow needle 102. The proximal end of needle 102 is securably inserted into and surrounded by the distal end of hub 101. The longitudinal lumen of needle 102 extends proximally into a longitudinal lumen section 103 formed by the hub and continues further proximally into longitudinal lumen section 104 formed by conical stylet seating portion 105 of the hub, eventually opening proximally into the proximal port (proximal stylet port) space 106 of hub 101. The inner dimension of proximal port 106 has a circular profile. Disposed transverse, here perpendicular, to the central longitudinal axes of the needle and hub are first and second opposing fluid reservoir chambers (barrels) 107A and 107B formed by hub 101 which outwardly open to the exterior but for plungers 108A and 108B inserted therein. Fluid reservoir chambers 107A and 107B are shown with a circular cross-sectional profile but may have any shaped profile so long as the plungers are mutually sized and configured. As shown for plunger 108 A, each plunger may include a radially protruding circumferential seal 109. Alternatively, or in addition, the plunger(s) may user other type of annular seals such as O-ring seals, such as those known in the art. Plunger 108 A is shown outwardly disposed while plunger 108B is shown fully inserted. Fluid redirection member 110 is a tubular elbow member sized and configured to slideably and rotatably (about the central longitudinal axis of hub 101) fit at one end into proximal port 106. As shown in the figure, the lumens formed between the end of the plungers and the respective fluid reservoirs chambers continue proximally into the interior space of the proximal stylet port portion of the hub.
[0032] FIG. 2 shows a perspective view of a stylet embodiment of the invention 200 that may be used with the hub and needle embodiment shown in FIG. 1. Stylet 200 includes an elongated stylet member 201 connected at its proximal end to a stylet handle (cap) 203. The proximal end of stylet handle 203 forms and presents a connector 204, such as a Luer connector such as Luer slip or Luer lock type (female geometry shown) for connection to a mutually sized and configured syringe or other filling device.
[0033] FIG. 3 schematically shows a longitudinal cross-section of the assembly 300 of the hub and needle embodiment shown in FIG. 1 with the mutually sized and configured stylet embodiment of FIG. 2 fully inserted into and seated in the hub and needle apparatus. The proximal end of elongate stylet member 201 is connected to the distal stylet connecting portion 208 of stylet handle 203. The outer radius of distal stylet connecting portion 208 of stylet handle 203 is not large enough to not block off the lumen that extends proximally from the fluid reservoir chambers. The distal-most portion of distal stylet connecting portion 208 is sized and configured to abut the proximal face of conical stylet seating portion 105 of hub 101. Portion 206 of stylet handle 203 sealingly surrounds the proximal stylet port portion of hub 101. Stylet handle 203 has formed therein one or more passageways, here two, 209A and 209B that fluidly connect the inner volume of connector portion 204 to the continuous lumen including and extending proximally from the fluid reservoir chambers of hub 101. [0034] The plungers shown in the figures are push plungers. Alternatively, one or more or all of the plungers could be screw plungers having threads that engage with corresponding internal threads of the fluid reservoir chamber such that the practitioner screw inserts the plunger(s) to displace the fluid in the chamber(s).
[0035] The invention also provides methods of preparing the apparatuses for use, methods for detecting the penetration of a needle into a negative pressure space, such as the epidural space, using the apparatuses and methods for inserting the needle into the space using the apparatuses.
[0036] The hub and needle apparatuses of the invention may, for example, be provided by the manufacturer for use in sterile form prefilled with saline with the one or more plungers displaced outwardly from their fully inserted positions, ready to be pressed inward (or otherwise advanced inward) during the procedure to obtain the hanging drop. In the case that the hub and needle apparatuses are provided prefilled, a stylet may also be pre-inserted. In this case, the stylet may be a conventional stylet (without a proximal end connection port communicating with the distal side of the stylet handle) or it may be the manner of stylet described herein which presents a proximal end connection port (for connection to a syringe) having a lumen in fluid communication with the distal side of the stylet handle and hub assembly lumen when the stylet is inserted into the hub and needle apparatus. If the hub and needle apparatus is supplied with the latter manner of stylet preinserted, the proximal port of the stylet handle may be closed with a cap/plug, such as a removable cap/plug, sized and configured to sealably engage the port. For example, if the stylet port presents a female Luer connector, the cap may present a
complementary solid conical (or frusto-conical) protrusion on one end and a tap (for grabbing and removing the cap/plus) on the other end.
[0037] Alternatively, the hub and needle apparatus may be supplied dry, i.e., unfilled with saline or other liquid, to be filled for use by the anesthesia personnel prior to use. The hub and needle apparatus may be supplied with the stylet having the proximal port in fluid communication with its distal side already fully inserted into the hub and needle apparatus. The proximal port of the stylet may or may not be provided with a cap/plug reversibly closing it. When the hub and needle apparatus is provided dry, the one or more plungers may be provided in a closed (fully inserted position), an open position or an intermediate position. The filling of the hub and needle apparatus with inserted stylet (having a proximal port in fluid communication with the distal end of the stylet handle) using a saline filled syringe is shown in FIG.4A. The plunger(s) may be initially disposed in a fully inserted position and be displaced outwardly as pressure form the syringe fills the fluid reservoir chambers. This method minimizes the air trapped in the syringe that needs to escape during filling. It should also be understood that the lumen of the hub assembly may also be filled under a vacuum/partial vacuum.
[0038] The syringe is thereafter removed and the filled hub and needle apparatus with inserted stylus remaining is then inserted to just outside the epidural space (FIG. 4B), such as in a typical epidural procedure. In more detail, the epidural needle is inserted into the ligamentum flavum. Anatomical structures traversed include skin, subcutaneous tissue, supraspinous ligament, and interspinous ligament. In the lumbar area, the depth of skin to ligamentum flavum is approximately 4 cm for most adults. Eighty percent of adults have a skin to ligamentum flavum depth of 3.5 - 6 cm. The average thickness of the ligamentum flavum is 5 -6 mm.
Controlling the needle is important to avoid a dural puncture. In the thoracic area, needle control is important to avoid dural puncture and risk of spinal cord injury.
[0039] Once the epidural needle of the apparatus is just outside the epidural space, the stylet is carefully withdrawn and set aside (FIG. 4C). At this point, depending on the orientation of the patient undergoing the procedure, a fluid redirection member (e.g. an elbow tube) may be connected to the stylet port of the hub assembly to ensure that the hanging drop to be formed will be in an at least substantially upright position. One of the plungers of the apparatus is then depressed to displace the saline in the reservoir chamber to create (bring up) a hanging drop at the proximal stylet port of the hub (FIG. 4D). The needle is then carefully advanced further toward the epidural space until aspiration of the hanging drop indicates that the distal end of the needle has entered the epidural space. In this manner, the anesthesia practitioner does not need to remove their hands from the apparatus to fill the hub with another syringe in order to obtain the hanging drop during the procedure as they would using a conventional hanging drop technique. In addition, since the embodiment shown in FIGS. 4A-D is a two-plunger apparatus, should the first hanging drop formed be inadvertently lost or aspirated due to a false positive drop in pressure, the practitioner can simply depress the second plunger to form a new hanging drop. Each plunger may also be capable of setting up more than one hanging drops depending on the volume of the fluid reservoir chamber.
[0040] Once the penetration of the needle into the epidural space is established, fine tuning of the needle position may optionally be performed according to practitioner preference and a catheter may be inserted through the needle into the epidural space for delivery of anesthesia and/or other medicaments.
[0041] While the apparatuses of the present invention are advantageously adapted to carry out the manner of hanging drop technique described herein, they may also be used in a variation of the loss of resistance technique by applying constant inward pressure to one or more plungers after the stylet is removed and while the needle is advanced toward the epidural space, until loss of resistance is sensed on the plunger(s) indicating penetration of the distal tip of the needle into the epidural space. In this case, a cap or plug may be secured to the stylet port of the hub assembly after the style is removed and prior to the advance in order to seal pressure within the lumen of the needle hub. This loss of resistance method may, for example be performed with the lumen of the needle hub only air/gas filled (or at least substantially air/gas filled) or liquid filled, such as saline filled. The loss of resistance method is not sensitive to the orientation of the patient during the procedure.
[0042] FIG. 5 schematically shows a safety mechanism that may be built into the hub and needle apparatuses to prevent inadvertent depression of a push plunger. FIG. 5 (top) shows fluid reservoir chamber 507 of a hub and needle apparatus similar to that shown in FIG. 1 except that a nub 517 extends radially inward from only part of the circumference of the wall of the chamber. The shaft of plunger 508 presents a radially outward extending nub 518. When the nubs are circumferentially coaligned, nub 517 blocks nub 518 preventing the plunger from depressing. When the plunger is rotated about the central axis of the plunger so that the paths of nubs 517 and 518 no longer overlap (FIG. 5 bottom), the plunger may be depressed. Before the needle is inserted into a patient, the apparatus may be provided in the locked position and switched to the unlocked position by rotating the plunger when the practitioner desires to form the hanging drop.
[0043] FIG. 6 schematically shows another safety mechanism that may be built into the hub and needle apparatuses to prevent inadvertent depression of a push plunger. Here, a partial circumferential section 617 of fluid reservoir chamber 607 extends farther outward than the rest of the chamber. The press top of plunger 608 is configured with a cutout sized and configured to permit section 617 to pass upon depressing the plunger when the cutout and section 617 are circumferentially coaligned and to block the plunger when not coaligned. Again, before the needle is inserted into a patient, the apparatus may be provided in the locked position and switched to the unlocked position by rotating the plunger when the practitioner desires to form the hanging drop.
[0044] Thus, as exemplified in FIGS. 5 and 6, where the plunger is a push plunger having a central longitudinal axis, the plunger and hub may be mutually sized and configured to selectively permit depression of the plunger based on the rotational position of the plunger about its central rotational axis.
[0045] The needle component of the hub and needle apparatuses of the invention may have any suitable configuration. For example, suitable types of needles for performing epidural procedures include the Tuohy needle, the Crawford needle and the Whitacre needle. Needle sizes are well known in the art and selection may vary, for example, based on age of the patient (child or adult). In general, 16-20 gauge needles may be used.
[0046] The various components of the invention may be made of any suitable materials.
For example, the hub and stylet handle may be made from a medical grade polymer such as a polyethylene, polypropylene or acrylic. Alternatively, the hub and stylet handle may be metallic. The needle of the hub and needle apparatus may be metallic such as made from a stainless steel. The elongate stylet member may be metallic or polymeric. Both polymeric and metallic components may be manufactured using means well known in the art such as molding, injection molding, machining, welding, joining with adhesives and combinations thereof. Various components such as the hub and stylet handle may also be manufactured using three-dimensional (3D) printing techniques, as known in the art.
[0047] In any of the embodiments, the fluid redirection member and/or at least the stylet port portion of the hub body may be transparent to facilitate visualization of the aspiration of the hanging drop and column of liquid beneath it upon penetration of the epidural space.
[0048] Each of the patent applications, patents and other publications cited in this disclosure is incorporated by reference as if fully set forth herein. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments.

Claims

WHAT IS CLAIMED IS:
1. A hub and needle apparatus for detecting penetration of the needle into a negative pressure space, comprising:
an elongate needle having a proximal end, a distal penetration end and a longitudinal axis, wherein a lumen extends lengthwise through the needle and opens at each end of the needle; and
a hub assembly having a proximal end and a distal end, the hub assembly comprising: a lumen formed by the hub assembly, a proximal end portion of the needle connected to the distal end of the hub assembly with the lumens of the needle and hub assembly in fluid communication with each other,
a stylet port disposed at the proximal end of the hub assembly, the stylet port communicating with the lumen of the hub assembly and having a longitudinal axis which is coaxial with the longitudinal axis of the needle at the needle's proximal end;
a fluid reservoir chamber in communication with the lumen of the hub assembly; and
a moveable plunger sealably engaging the fluid reservoir chamber.
2. The hub and needle apparatus of claim 1, further comprising:
a fluid redirection member rotatably and removably connected to the stylet port of the hub assembly, the fluid redirection member having a lumen opening on one side into the lumen of the hub assembly when connected to the stylet port and opening to the exterior in a direction transverse to the longitudinal axis of the stylet port.
3. The hub and needle apparatus of claim 1, further comprising:
a separate stylet comprising:
an elongate stylet member having a proximal end and a distal insertion end; and a stylet handle connected to the proximal end of the stylet member, the stylet handle comprising an outward-facing fluid connection port,
wherein the stylet and the hub assembly are mutually sized and configured so that when the stylet is fully inserted into the hub assembly, the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked, and
wherein the stylet is fully inserted into the hub assembly such that the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked.
4. The hub and needle apparatus of claim 1, wherein:
the fluid reservoir chamber is at least substantially filled with liquid, and
the plunger is outwardly displaced from its fully inserted position.
5. The hub and needle apparatus of claim 3, wherein:
the fluid reservoir chamber is at least substantially filled with liquid, and
the plunger is outwardly displaced from its fully inserted position.
6. The hub and needle apparatus of claim 1, comprising:
two fluid reservoir chambers in communication with the lumen of the hub assembly; and for each of the two fluid reservoir chambers, a moveable plunger sealably engaging the fluid reservoir chamber.
7. The hub and needle apparatus of claim 7, wherein:
the two fluid reservoir chambers are disposed about the hub in a laterally opposing configuration.
8. The hub and needle apparatus of claim 1, wherein the plunger is a push plunger having a central longitudinal axis and the plunger and hub are mutually sized and configured to selectively permit depression of the plunger based on the rotational position of the plunger about its central rotational axis.
9. A kit for detecting the penetration of a needle into a negative pressure space, comprising:
(i) a hub and needle apparatus comprising: an elongate needle having a proximal end, a distal penetration end and a longitudinal axis, wherein a lumen extends lengthwise through the needle and opens at or near each end of the needle; and
a hub assembly having a proximal end and a distal end, the hub assembly comprising:
a lumen formed by the hub assembly, a proximal end portion of the needle connected to the distal end of the hub assembly with the lumens of the needle and hub assembly in fluid communication with each other,
a stylet port disposed at the proximal end of the hub assembly, the stylet port communicating with the lumen of the hub assembly and having a longitudinal axis which is coaxial with the longitudinal axis of the needle at the needle's proximal end,
a fluid reservoir chamber in communication with the lumen of the hub assembly, and
a moveable plunger sealably engaging the fluid reservoir chamber; and (ii) a stylet comprising:
an elongate stylet member having a proximal end and a distal insertion end; and
a stylet handle connected to the proximal end of the stylet member, the stylet handle comprising an outward- facing fluid connection port,
wherein the stylet and the hub assembly are mutually sized and configured so that when the stylet is fully inserted into the hub assembly, the outward facing fluid connection port of the stylet is in fluid communication with the lumen of the hub assembly while fluid communication with the proximal opening of the elongate needle is blocked.
10. The kit of claim 9, further comprising:
a fluid redirection member sized and configured to rotatably and removably connect to the stylet port of the hub and needle assembly, the fluid redirection member having a lumen opening on one side into the lumen of the hub assembly when connected to the stylet port and opening to the exterior in a direction transverse to the longitudinal axis of the stylet port.
11. The kit of claim 9, wherein the hub and needle apparatus comprises:
two fluid reservoir chambers in communication with the lumen of the hub assembly; and for each of the two fluid reservoir chambers, a moveable plunger sealably engaging the fluid reservoir chamber.
12. The kit of claim 11 , wherein:
the two fluid reservoir chambers are disposed about the hub in a laterally opposing configuration.
13. The kit of claim 9, wherein the plunger is a push plunger having a central longitudinal axis and the plunger and hub are mutually sized and configured to selectively permit depression of the plunger based on the rotational position of the plunger about its central rotational axis.
14. A stylet, comprising:
an elongate stylet member having a proximal end, a distal insertion end, a central longitudinal axis and an outer diameter; and
a stylet handle having a proximal side and a distal side, the distal side of the stylet handle connected to the proximal end of the stylet member and the stylet handle comprising a proximally-facing fluid connection port forming a lumen, said lumen extending via a passage through to the distal side of the stylet handle,
wherein the average exterior dimension of the stylet handle transverse to the central longitudinal axis of the elongate stylet member is greater than the outer diameter of the stylet member.
15. The stylet of claim 14, wherein the proximally-facing fluid connection port of the stylet handle presents a conically tapered recess for a tapered fit connection.
16. The stylet of claim 15, further comprising a syringe having a conically tapered protrusion connector sized and configured to form a tapered fit connection with the conically tapered recess presented by the stylet handle, wherein the stylet handle and syringe are connected by engagement of said protrusion connector and conically tapered recess.
PCT/US2014/043955 2013-06-24 2014-06-24 Apparatus for hanging drop detection of epidural space penetration WO2014210066A1 (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3158052A4 (en) * 2014-06-19 2018-02-21 Sipple, Daniel Biomarker detection and identification system and apparatus
TWI572387B (en) 2014-11-21 2017-03-01 羅文甫 A positioning device for needle syringe
CN105167824A (en) * 2015-10-14 2015-12-23 无锡市瑞源普斯医疗器械有限公司 Single-use epidural space puncture indicator
US10806894B2 (en) 2016-02-11 2020-10-20 Cook Medical Technologies Llc Catheter hub with sealed access port
US10369330B2 (en) 2016-02-11 2019-08-06 Cook Medical Technologies Llc Drainage catheter hub with a semi-compressed suture seal
KR101639641B1 (en) * 2016-04-25 2016-07-14 유한회사 삼성산업경제연구소 Position detector for Epidural Space
CN111420171B (en) * 2020-04-17 2024-08-23 四川大学华西医院 Anti-reflux scalp needle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026287A (en) * 1975-12-10 1977-05-31 Irene Haller Syringe with retractable cannula
US4623335A (en) * 1985-10-09 1986-11-18 Anthony Jackson Apparatus and methods for detecting probe penetration of human internal target tissue having predetermined internal pressure
US5069665A (en) * 1990-07-02 1991-12-03 Ng Raymond C Fluid aspiration needle

Family Cites Families (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2866453A (en) 1957-05-29 1958-12-30 Warren R Jewett Direct reading hypodermic pressure indicating device
US3241514A (en) * 1964-10-12 1966-03-22 Geotechnical Corp Pneumatic pressure indicator
FR1544767A (en) * 1967-09-25 1968-11-08 Hautegaronne Ets Auriol & Cie Advanced syringe and needle for lumbar punctures
MX144149A (en) 1976-04-28 1981-09-02 Kendall & Co IMPROVED DEVICE TO VERIFY THE POSITION OF A NEEDLE IN THE BODY OF A PATIENT
US4175567A (en) 1976-04-28 1979-11-27 The Kendall Company Method of locating the epidural space
US4215699A (en) 1978-04-03 1980-08-05 The Kendall Company Position indicating device
US4186750A (en) * 1978-04-19 1980-02-05 The Kendall Company Position testing device
US4253463A (en) * 1979-10-19 1981-03-03 Kim Il B Method of reducing infection utilizing an intravascular device having antiseptic metal portion
US4308875A (en) * 1981-03-11 1982-01-05 Universal Medical Instrument Corporation Amniocentesis needle
US4801293A (en) 1985-10-09 1989-01-31 Anthony Jackson Apparatus and method for detecting probe penetration of human epidural space and injecting a therapeutic substance thereinto
US4799494A (en) * 1986-10-22 1989-01-24 Wang Ko P Percutaneous aspiration lung biopsy needle assembly
US4944724A (en) * 1987-06-05 1990-07-31 Uresil Corporation Apparatus for locating body cavities having signaling indicator
US4940458A (en) 1989-02-02 1990-07-10 Cohn Arnold K Epidural needle placement system
US5024655A (en) 1989-09-05 1991-06-18 Freeman Andrew B Epidural catheter apparatus and associated method
US5084016A (en) * 1989-09-05 1992-01-28 Freeman Andrew B Epidural catheter apparatus with an inflation fitting
US5188594A (en) 1991-07-22 1993-02-23 Michael Zilberstein Method of administering medication into epidural space
US5205828A (en) 1991-10-24 1993-04-27 Dan Kedem Epidural needle location indicator assembly
US5295969A (en) * 1992-04-27 1994-03-22 Cathco, Inc. Vascular access device with air-tight blood containment capability
EP0608659A1 (en) 1993-01-28 1994-08-03 Du Kedem Technologies Ltd. Epidural needle location indicator assembly
US5421821A (en) * 1993-11-12 1995-06-06 Marlow Surgical Technologies, Inc. Verres needle system and method
US5902273A (en) * 1997-10-15 1999-05-11 Yang; Ian Y. Pressurizable epidural space identification syringe
US6773417B2 (en) 2001-07-06 2004-08-10 Ispg, Inc. Epidural space locating device
CN2571332Y (en) 2002-09-30 2003-09-10 朱东亚 Cyst indication device for epidural space puncture
US20040181192A1 (en) * 2003-03-11 2004-09-16 Cuppy Michael John Vascular access device and method of using same
CA2423016C (en) 2003-03-20 2012-06-19 North West London Hospitals Nhs Trust A device for the identification of the epidural space
US8105310B2 (en) * 2003-05-21 2012-01-31 Klein Jeffrey A Infiltration cannula
WO2009066972A1 (en) * 2007-11-20 2009-05-28 Innovamédica S.A.P.I. De C.V. Electronic syringe with safety system for spinal injections
ES2627353T3 (en) * 2008-01-14 2017-07-27 Custom Medical Applications, Inc. Flow of elements for use with flexible spinal needles, needle assemblies and manufacturing methods
CN201328862Y (en) 2009-01-14 2009-10-21 孙东 Low resistance indication injector for epidural space puncture
CN101721205B (en) 2010-02-02 2011-04-20 天津美迪斯医疗用品有限公司 Disposable epidural puncture negative pressure indicator
CN202365879U (en) 2011-12-13 2012-08-08 肖国红 Epidural space puncture needle
CN102614563B (en) 2012-03-12 2016-02-17 河南驼人医疗器械集团有限公司 Cavum epidural puncture high-drag push rod vesicle indication injector
CN202505895U (en) 2012-03-12 2012-10-31 闫清 High-resistance push rod vesicle indicating injector for epidural space puncturing
CN202665704U (en) 2012-07-03 2013-01-16 罗永温 Epidural space puncture positioning indicator
CN102715937B (en) 2012-07-03 2015-01-07 罗永温 Epidural space puncture location indicator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026287A (en) * 1975-12-10 1977-05-31 Irene Haller Syringe with retractable cannula
US4623335A (en) * 1985-10-09 1986-11-18 Anthony Jackson Apparatus and methods for detecting probe penetration of human internal target tissue having predetermined internal pressure
US5069665A (en) * 1990-07-02 1991-12-03 Ng Raymond C Fluid aspiration needle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3021892A4 *

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WO2014210069A3 (en) 2015-04-16
US20140378905A1 (en) 2014-12-25
US20140378904A1 (en) 2014-12-25
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EP3021892A1 (en) 2016-05-25
US9144436B2 (en) 2015-09-29
WO2014210069A2 (en) 2014-12-31

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