Approximately 1.2 million craniotomy and 6 million spinal procedures are performed annually worldwide. Of those, approximately half of both types of procedures are performed in the United States. Each of these procedures generally requires watertight closure of the dura mater (dura), the leathery membrane that surrounds and protects the brain and spinal cord within their bony confines.
There exists a major unmet need for a product that consistently applies a hydrogel sealant during multiple applications to confined, hard to reach areas of the cranium and spine, creating a watertight dural closure that prevents cerebrospinal fluid (CSF) leakage. Leakage can occur at suture pinholes, incidental tears or other small gaps in the dura. Serious complication can occur including: extra-dural and subcutaneous collections of CSF, known as pseudomeningoceles, acute and chronic problems of wound healing due to CSF collection, compression of neurological tissues, meningitis, encephalitis, headaches, infection, cognitive changes, additional surgical interventions, prolonged hospitalization, and increased cost. Conventional techniques of preventing CSF leaks are often insufficient because they may not completely stop CSF leaks.
Applicant has developed and markets a two-component hydrogel dural sealant suitable for use as an adjunct to standard methods of dural repair, such as sutures, to provide watertight closure to incised or otherwise compromised dura and as an adhesion barrier to limit post-surgical peridural fibrosis and adhesions. U.S. Pat. No. 8,410,189; U.S. Patent Application Publication No. 2007/0196454; both of which are incorporated herein by reference. The two components are a polyalkyleneimine, such as polyethyleneimine (PEI), and a crosslinking reagent which causes the polyalkyleneimine polymers to polymerize, thereby forming a seal. In certain instances, the crosslinking reagent is a polyethylene glycol (PEG) having reactive terminal groups. Generally, the polyalkyleneimine and crosslinking reagent components are combined shortly before or during their application so that they crosslink in situ in the desired location.
Applicant has also developed and markets a number of applicators suitable for use with the two-component dural sealant. U.S. Pat. Nos. 8,323,262; 8,343,183; 8,262,608; U.S. Patent Application Publication No. 2010/0280547; U.S. Patent Application Publication No. 2013/0338631; all of which are incorporated herein by reference.
An aspect of the invention is a tip assembly, comprising
a proximal end, comprising a Y fitting, the Y fitting comprising
a distal end;
a mixing nozzle (12), comprising
a tube extending from the distal end of the Y fitting to the proximal end of the mixing nozzle;
a first cannula (6), disposed within and extending along substantially the entire length of the tube, in fluid communication with the first fluid channel of the Y fitting and the fluid inlet of the mixing nozzle; and
a second cannula (7), disposed within and extending along substantially the entire length of the tube, in fluid communication with the second fluid channel of the Y fitting and the fluid inlet of the mixing nozzle;
wherein the tube, the first cannula, and the second cannula are flexible.
An aspect of the invention is a multi-component delivery system, comprising the tip assembly described herein. In a preferred embodiment, the tip assembly of the invention is substituted for the corresponding tip assembly in the multi-component delivery system disclosed in U.S. Patent Application Publication No. 2013/0338631, the entire content of which is incorporated herein by reference.
An aspect of the invention is a method of using the tip assembly of the invention. The method comprises the steps of:
Neurosurgical procedures, such as craniotomy and spinal surgery, frequently involve penetration of the dura mater. Many of these procedures are characterized by sites with limited or difficult access owing to their anatomy and/or the use of minimally invasive techniques and equipment. For example, certain infratentorial, skull base, and spinal surgical procedures present limited or difficult access.
Applicant currently markets, as Adherus AutoSpray Dural Sealant, a sterile, single-use, electromechanical, battery-operated device with internal system components that (i) provide air flow to aid in the delivery of a synthetic, absorbable, two-component hydrogel sealant system, and (ii) allow delivery to be interrupted without clogging. The device is supplied as a pre-assembled applicator and two separate glass vials containing the crosslinking components which, when prepared and mixed, create hyperbranched globular structures through the crosslinking of a polyfunctional nucleophile with a bifunctional electrophile. The product is simple to prepare and, once applied to the dural surface, quickly cures to form a watertight seal. Adherus AutoSpray Dural Sealant is a single-use device supplied terminally sterilized by radiation. See U.S. Patent Application Publication No. 2013/0338631, the entire content of which is incorporated herein by reference.
The Adherus AutoSpray Dural Sealant has a relatively short or “stub-nosed” or “snub-nosed” tip which creates a locally directed spray comprised of the combined components of the hydrogel sealant. See
The instant invention provides an extended and flexible tip suitable for use in delivering a two-component liquid composition as a locally directed spray. The extended, flexible tip is specifically useful in conjunction with delivery of a two-component hydrogel sealant, such as is described in U.S. Pat. No. 8,410,189 and U.S. Patent Application Publication No. 2007/0196454 (both of which are incorporated by reference). Additionally, the extended, flexible tip is specifically useful as a modification of the Adherus AutoSpray Dural Sealant described above, whereby the extended, flexible tip of the invention is substituted for the snub-nosed, standard length tip of the applicator device/system.
Advantages of the extended, flexible tip of the invention include its ability to access confined, hard-to-reach surgical sites that otherwise allow only limited access, such as infratentorial, skull base (e.g., transsphenoidal), and spinal sites; and the ability to provide improved visualization for the operator during use. For example, the extended length of the tip permits improved accessibility, and the flexibility of the tip permits positioning of the applicator handset out of the line of sight of the applicator tip.
In one embodiment, the extended, flexible tip of the invention is incorporated into a pre-assembled, ready-for-use sterile applicator that reduces preparation time and allows the controlled application of a hydrogel formulation within confined, hard-to-reach areas, e.g., of the cranium and spine, without clogging. For example, the extended, flexible tip may be incorporated into a sterile, single-use, electromechanical, battery operated, device with internal system components that provide air flow to aid in the delivery of a synthetic, absorbable, two-component hydrogel sealant system and allow delivery to be interrupted without clogging. In one embodiment the device is supplied as a pre-assembled applicator and two separate glass vials containing the crosslinking components which, when prepared and mixed, create hyperbranched globular structures through the crosslinking of a polyfunctional nucleophile with a bifunctional electrophile.
An aspect of the invention is a tip assembly, comprising
In an embodiment, the first cannula further extends along substantially the entire length of the first fluid channel of the Y fitting; and the second cannula further extends along substantially the entire length of the second fluid channel of the Y fitting. In such an embodiment the Y fitting can be formed, for example, by injection molding around at least a portion of the proximal ends of the cannulae.
In certain embodiments, the first cannula and the second cannula are made of annealed stainless steel tubing. The annealed stainless steel tubing provides a desirable combination of both stiffness and flexibility, e.g., bendability.
In certain embodiments, the cannulae are identical in length and inside diameter.
In certain embodiments, the cannulae have an inside diameter of about 0.03 inches (0.76 millimeters (mm)) to about 0.05 inches (1.27 mm).
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 12 centimeters (cm) to about 20 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 12 cm to about 15 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 12 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 1 cm to less than about 12 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 1 cm to about 10 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 1 cm to about 8 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 1 cm to about 6 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 1 cm to about 4 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 2 cm to less than about 12 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 2 cm to about 10 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 2 cm to about 8 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 2 cm to about 6 cm.
In certain embodiments, the length of the assembly from the distal end of the Y fitting to the distal end of the mixing nozzle is about 2 cm to about 4 cm.
In certain embodiments, the tip assembly further comprises a tubing adapter which, as a sleeve, accepts the distal end of the Y fitting and the proximal end of the tube. See
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 12 centimeters (cm) to about 20 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 12 cm to about 15 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 12 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 1 cm to less than about 12 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 1 cm to about 10 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 1 cm to about 8 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 1 cm to about 6 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 1 cm to about 4 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 2 cm to less than about 12 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 2 cm to about 10 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 2 cm to about 8 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 2 cm to about 6 cm.
In certain embodiments, the length of the assembly from the distal end of the tubing adapter to the distal end of the mixing nozzle is about 2 cm to about 4 cm.
In certain embodiments, the tip assembly further comprises a third fluid channel, wherein the third fluid channel is defined by and extends from a proximal inlet of the Y fitting, along and within the tube, to a distal outlet in fluid communication with the mixing chamber of the mixing nozzle.
In certain embodiments, the proximal inlet of the Y fitting comprises a fitting suitable for receiving a gas from a gas reservoir or source of gas. In one embodiment, the gas is air. The gas reservoir or source of gas may be a gas-pump that is a built-in component of an applicator.
In certain embodiments, the tube comprises polymeric material that may be sterilized by radiation.
In certain embodiments, the tube is made of polytetrafluoroethylene (Teflon®, DuPont).
In certain embodiments, the tube is made from phthalate-free medical grade polyvinyl chloride (PVC).
In certain embodiments, the tube has a maximum outside diameter of about 5.5 millimeters (mm), and the mixing nozzle has a maximum outside diameter of about 5.5 mm.
In certain embodiments, the tube has a maximum outside diameter of about 5.2 mm, and the mixing nozzle has a maximum outside diameter of about 5.2 mm.
In certain embodiments, the tube and its contents together can be bent at least 30° over a 2.25-inch span upon application of force no less than about 1 pound and no more than about 24 pounds. Advantageously, the tube and its contents (e.g., the two cannulae) can be readily bent by hand, with or without the aid of any tool, thereby permitting operating room personnel (e.g., surgeon) the ability to conform, and even re-conform, the tube to a shape of choice.
An aspect of the invention is a multi-component delivery system, comprising the tip assembly described herein. In a preferred embodiment, the tip assembly of the invention is substituted for the corresponding tip assembly in the multi-component delivery system disclosed in U.S. Patent Application Publication No. 2013/0338631, the entire content of which is incorporated herein by reference. See
An aspect of the invention is a method of using the tip assembly of the invention. The method comprises the steps of:
In an embodiment, the first component and the second component are components of an adhesive. For example, the first component and the second component can be a urethane and a fibrin, respectively. As another example, the first component and the second component can be a polyalkyleneimine and an activated PEG, respectively. As yet another example, the first component and the second component can be PEI and an activated PEG, respectively.
In an embodiment, the first component and the second component are components of a sealant. For example, the first component and the second component can be a urethane and a fibrin, respectively. As another example, the first component and the second component can be a polyalkyleneimine and an activated PEG, respectively. As yet another example, the first component and the second component can be PEI and an activated PEG, respectively.
In an embodiment, at least one of the first component and the second component can comprise a drug or other biologically active component.
In an embodiment, at least one of the first component and the second component is a drug or other biologically active component.
In an embodiment, the method further comprises bending the tube and its contents. For example, the tube and its contents may be bent an amount sufficient to permit improved access to a surgical site having limited or difficult access. In certain embodiments, the tube and its contents may be bent an amount sufficient to permit improved line of sight for the operator (e.g., surgeon).
In certain embodiments, the tube and its contents can be bent in one or more locations. In certain embodiments, the tube and its contents can be bent in one location. In certain embodiments, the tube and its contents can be bent in two locations. In certain embodiments, the tube and its contents can be bent in three locations. When there is more than one bend, each bend can be made independent of any other, in terms of acuity, direction, and plane.
In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 10°. In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 20°. In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 30°. In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 40°. In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 45°.
An aspect of the invention is a method of using the tip assembly of the invention. The method comprises the steps of:
In an embodiment, the method further comprises bending the tube and its contents. For example, the tube and its contents may be bent an amount sufficient to permit improved access to a surgical site having limited or difficult access. In certain embodiments, the tube and its contents may be bent an amount sufficient to permit improved line of sight for the operator (e.g., surgeon).
In certain embodiments, the tube and its contents can be bent in one or more locations. In certain embodiments, the tube and its contents can be bent in one location. In certain embodiments, the tube and its contents can be bent in two locations. In certain embodiments, the tube and its contents can be bent in three locations. When there is more than one bend, each bend can be made independent of any other, in terms of acuity, direction, and plane.
In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 10°. In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 20°. In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 30°. In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 40°. In respect of each bend, in certain embodiments, the tube and its contents may be bent by up to about 45°.
In an embodiment, the spray is applied to dura mater of a subject.
In an embodiment, the dura mater is cranial dura mater.
In an embodiment, the dura mater is spinal dura mater.
In certain embodiments, the method is part of a neurosurgical procedure.
In an embodiment, the neurosurgical procedure is infratentorial craniotomy.
In an embodiment, the neurosurgical procedure is skull base craniotomy.
In an embodiment, the neurosurgical procedure is transsphenoidal craniotomy.
In an embodiment, the neurosurgical procedure is surgery on the spine.
In certain embodiments, the spray is applied to a mesh implant, e.g., a hernia repair mesh, in situ.
In certain embodiments, the spray is applied to a tissue of interest to prevent or reduce the development of adhesion formation between the tissue of interest and another tissue.
In certain embodiments, the method is part of a hernia repair procedure, e.g., a femoral, inguinal, or abdominal hernia repair.
In certain embodiments, the method is part of an abdominal surgical procedure, including, without limitation, exploratory laparotomy, stomach or bowel resection or repair, bowel reanastomosis, gastroplasty, appendectomy, cholecystectomy, splenectomy, nephrectomy, tubal ligation or resection, tumor resection, and repair of abdominal aortic aneurysm.
In certain embodiments, the method is part of a thoracic surgical procedure.
The invention further contemplates methods of using the tip assembly of the invention with only a single component. For example, also contemplated is a method comprising the steps of:
bringing a source of a component into fluid communication with the first fluid channel;
causing the component to traverse the first cannula; and
expelling the component through the fluid outlet of the mixing nozzle, thereby forming a spray of the component.
The invention now being generally described, it will be more readily understood by reference to the following examples, which are included merely for purposes of illustration of certain aspects and embodiments of the present invention, and are not intended to limit the invention.
All tubing (cannulae) was 1/16″ outside diameter, annealed stainless steel. Teflon tubing was used as the exterior polymer tubing sheath (tube).
Results
a) Samples with 0.030″ inside diameter (ID) tubing had very little dripping during start-and-stop operations. Gravimetric swelling=22.4±6.22 (mean±std. dev) percent vs. 18% on control units of same formulation but current stub-nose AutoSpray.
b) Samples with 0.020″ inside diameter exhibited much worse spray behavior.
Lots of dripping of PEG solution during stop operation (with air pump on).
Gravimetric swelling=24.8±3.1%
Gravimetric swelling is a measure of the completeness of mixing and polymerization. If not well mixed, or if the two liquids are not proportioned correctly, the swelling will be higher.
CONCLUSION: Unexpectedly, the larger inside diameter was better. (Prior to experiment I would have predicted a smaller inside diameter would be better, i.e., have less of a chance to allow PEG or PEI solution to leak out during stop operation.
Tubing (cannulae) with 0.030″, 0.040″ and 0.046″ ID.
All of the U.S. patents and U.S. patent application publications cited herein are hereby incorporated by reference.
Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. Such equivalents are intended to be encompassed by the following claims.
This application claims benefit of U.S. Provisional Patent Application No. 61/975,328, filed Apr. 4, 2014.
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