Abstract:
A jaw-thrust device includes a base with an extension arm disposed on each side of a patient&#39;s head mounted on the base. A mandible rest is mounted on each extension arm such that the mandible rest may be deployed proximate to a patient&#39;s mandible. A chin pad and at least one connector connects the chin strap to at least one of the base or extension arm; whereby jaw thrusting pressure on the mandible rests causes rotational force on the chin straps such that the patient&#39;s mouth opens without substantially tilting the patient&#39;s head. The device maintains an open airway unattended.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to U.S. Provisional Patent application No. 61/104,939 filed Oct. 13, 2008. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention is in the field of emergency medicine and particularly relates to airway maintenance. 
         [0004]    2. Related Art 
         [0005]    Establishing and maintaining a patient airway is one of the most important components of Basic Life Support (BLS). When patient loses consciousness, the muscles of the jaw and pharynx relax, tongue falls back and this results in obstruction of the airway. Obstructed airway will result in hypoxemia and hypercarbia from hypoventilation thus further worsening patient&#39;s condition. 
         [0006]    Normally, a head tilt-chin lift maneuver is commonly performed to open an airway in unresponsive victims. However, in patients with suspected neck/cervical spinal injury, a jaw-thrust maneuver without head tilt is the recommended method of opening an airway, in order to keep the spine stable, as depicted in  FIG. 1 . 
         [0007]    The jaw-thrust is very commonly used by medical personnel working in acute care settings such as EMT (Emergency Medical Technicians), emergency room physicians, intensivists and anesthesiologists. It may also be indicated in other situations such as post anesthesia. However, whenever someone is assisting in jaw-thrust maneuver he/she has to be completely focused on the airway and is usually unable to contribute to resuscitation. Thus these maneuvers result in tying up a person for the duration of time, until a permanent airway is established e.g., by intubation or until patient&#39;s consciousness has recovered enough to maintain airway by him/her self. A mechanical device, which will perform a jaw-thrust and chin-lift will be a reasonable solution and can be applied in various settings. 
       SUMMARY OF THE INVENTION 
       [0008]    The present invention will advantageously: perform jaw-thrust and chin-tilt (instead of chin-lift) to open and maintain an airway for the duration of emergency or surgical care, be applicable to different age groups and sizes of the patient, be easy to apply and disconnect to and from the patient (user friendly), could be used in a variety of different settings by various users, be easy to clean and maintain, and be safe for patients of different ages and sizes. 
         [0009]    This mechanical device will have different components. Extension arms on each side will have ability to adjust height sufficient to reach each patient&#39;s angle of jaw. The extension arms will be foldable, so they will be out of the way once done with their job. The distance between them is easily changed, so they could be moved towards each other for smaller size patient and moved away from each other for larger size patient. Each arm will have a detachable and thus disposable ‘mandible rest,’ which is a cushioned seat for resting the angle of the mandible. A replaceable H-shaped belt is oriented with the bridge of the H to rest on the chin. Both the upper arms will be adjustable with end attachments just below the mandible rest. Both lower arms will be non-elastic or even not flexible and will have end attachments at the base of the extension arms. Thus, as the mandible rest is being elevated to reach patients&#39; angle of mandible, patients&#39; chin will tilt to open the mouth (due to the non-flexible arms of H-belt pulling the chin down). Hence the invention biases the mandible towards the natural movements of extension combined with opening rotation—as shown in FIG.  2 —in the same manner as the manual prior art Jaw Thrust maneuver. 
         [0010]    Both the extension arms and H-belt will be mounted on a backboard that can be easily placed underneath the patient&#39;s head, thus making it easy to move in and out depending on patient&#39;s need. The board will have a groove between the extension arms; so that distance between the arms can be changed (they can be moved towards or away from each other depending on patients&#39; size). This board may be equipped with inflatable cuffs/pillows (either manual or automatic) that could provide for the roll under the shoulder used for airway support of infants and children under the age of 2 years. Another inflatable pillow could be positioned to provide head rest for older children and adult. 
         [0011]    The invention advantageously frees up a rescuer who could perform other functions. This will avoid unnecessary fatigue of the rescuer if jaw thrust/chin tilt has to be done for longer duration. As the jaw is well supported on the mandible rest, it may maintain the head in the midline. The inflatable pillow for shoulder or head will help align the airway further depending on the age of the patient. The invention will be used by an EMT during transport of unconscious patient and emergency physicians, anesthesiologists, and intensivist can use it for sedated, post-operative or unconscious patient to open and maintain the airway. 
         [0012]    Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein: 
           [0014]      FIG. 1  is a side view of a manual jaw thrust; 
           [0015]      FIG. 2  is a side view of a mandible; 
           [0016]      FIG. 3  is a perspective view of the jaw thrust mechanism; 
           [0017]      FIG. 4  is a perspective view of an alternate embodiment in a first position; 
           [0018]      FIG. 5  is a perspective view of the alternate embodiment in a second position; 
           [0019]      FIG. 6  is a side view of the alternate embodiment; 
           [0020]      FIG. 7  is a perspective view of the alternate embodiment; 
           [0021]      FIG. 8  is a schematic view of the alternate embodiment in use. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0022]    The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. 
         [0023]      FIG. 3  is a perspective view of the present invention. The components are mounted on a base, which in the depicted embodiment is a backboard  10  or a panel that may be fixedly attached to a pre-existing backboard, serves as a platform for mounting the various features of the present invention. A pair of telescoping extension arms  12  are mounted on either side of the backboard  10 , on an upper surface facing a patient. These extensions  12  may slide medially and laterally, in order that they may be moved closer or farther away from the patient&#39;s mandible, thus allowing a firm engagement of the mandible rests  14 , which are mounted on top of the telescoping extensions  12 . In the depicted embodiment, medial and lateral translation of the extending arms  12  is achieved by mounting the extending arms  12  within a groove  16 . The extending arms telescope vertically in order that the mandible rests  14  may again be put in engagement with a dorsal aspect of a patient&#39;s mandible, bilaterally. 
         [0024]    Attached to an upper portion  18  and a lower portion  20  of the extending arms  12  are straps or bands. The straps are joined in a center portion  22  which comprises a chin strap. In the depicted embodiment the chin strap includes a pad. An upper strap  24  is attached to an upper portion  18  of each extending arm  12 , bilaterally. A lower portion  28  of the strap is attached to a fixed lower portion  20  of the extendible arms  12 , bilaterally. The lower straps  28  are not extendable. They may be adjusted to the patient&#39;s size initially, but during the jaw thrust maneuver and thereafter they do not flex or extend. In the depicted embodiment, straps  28  are non-elastic fabric straps. They have a series of holes for initial adjustment. The fixation of the straps to separate portions of the telescoping extension arm assure that the ends of straps  28  will be separated from the ends of straps  24  when the mandible rests are elevated and the thrust maneuver is executed. 
         [0025]    Supplemental features of the present invention in the depicted embodiment include side bars  40  for stabilizing the patient&#39;s head. The side bars  40  may be moved in and out of position by rotation or translation towards and away from the sides of the patient&#39;s head. Also shown in the depicted embodiment are pillows  50  and  52 . These pillows are designed to be extended and retracted vertically in any manner, as for example by inflation, as in the depicted embodiment. The first pillow  50  is for use with adult patients, who typically have bulkier shoulders and optimally have a straight spine and airway maintained by elevating the head relative to the body. Conversely, children have larger heads proportional to their body size. Accordingly, the best technique for maintaining a straight spine and airway in children is by elevating their shoulders. For this purpose a second pillow  52  is placed below the chin strap assembly. Optionally, the pillows may be adjustable towards the patient&#39;s head or feet in order to best position the patient&#39;s head. 
         [0026]    In use, a patient is placed on the backboard  10 , the side bars  40  and one of the pillows  50  or  52  are adjusted to the patient&#39;s head and shoulders. Thereafter, the extending arms  12  are translated medially or laterally in order to approximate the mandible rests  14  to a dorsal aspect of the patient&#39;s mandible. The chin strap  22  is put on and slightly above the patient&#39;s chin, below the lower lip. Thereafter the extendible arms  12  are telescopically extended so that the mandible rests exert pressure on the patient&#39;s mandible, forcing it upwards such that the mandible advances outwards relative to the patient&#39;s maxilla. The chin strap  22 , being non-extendibly anchored to the lower extension member  20 , will be restrained relative to the upward pressure on the mandible rests  14 , and accordingly be forced by the upwards pressure to move in the only available direction, which is to rotate downwards and away from the patient&#39;s maxilla, thereby achieving the desired opening of the jaw and airway beneath it. Once the desired degree of extension and opening of the patient&#39;s jaw has been achieved, it may be maintained in that position by upward pressure of the mandible rests  14  and rotational pressure of the chin strap  22  in turn being maintained by locking the extending arms  12  in their telescoped, extended position. This may be achieved by any known means. As for example, selective insertion of a locking pin, tightening of a set screw or a ratchet. Once set, the user may let go of the jaw thrust device of the present invention and proceed to other medical care and the patient&#39;s airway will be advantageously maintained in the open jaw thrust position by the device without further support from any medical practitioner. 
         [0027]      FIGS. 4-7  refer to an alternate embodiment of the present invention. This embodiment is comprised generally of a platform  110  which may be a portion of a backboard or a plate attachable to a backboard. Mounted on the plate  110 , generally, are a first side bar assembly  140 A and a second side bar assembly  140 B, corresponding respectively to the patient&#39;s left and right side. These side bar assemblies may be used as head stabilizers, head positioners and/or head rest. The second embodiment also is comprised of a first mandible rest assembly  108 A and a second mandible rest assembly  108 B corresponding to a patient&#39;s left side and a patient&#39;s right side, respectively. Finally, a chin strap  122  is non-elastically attached to the plate  110  at attachment  120 , which may be a buckle, such as a cam buckle, although other adjustment members may be used. Alternatively, chin straps may be mounted with four anchors, with extra substantially symmetrical anchors  121  being positioned higher than the first anchors  120 , for example between the side bar and mandible rest assemblies. 
         [0028]    Each of the head stabilization assemblies  140  is mounted on a transverse slot  142 . The head stabilization/immobilization assemblies each include a base block  144  and a vertical adjustment element  146  which may, as depicted, be a vertical rod. The head stabilization assemblies  140  may be adjusted medially and laterally by sliding them in and out along the slots  142 . They may be fixed in a user selected position by application of a fixating device (not shown) as for example a set screw. These assemblies may be used to immobilize the head, for example in the midline of the overall plate and back board. 
         [0029]    Each head stabilization assembly  140  has a vertical riser block  148 . Vertical riser blocks have mounted to them head rest blocks  150 . The vertical riser blocks  148  and head rest  150  may be raised and lowered by sliding along the vertical rods  146 . When raised or lowered to a user selected position they may be locked in placed by application of a locking device which may be, as depicted a tensioning lever  152 . The head rests  150  are located at a user selected position on the patient&#39;s head, for example, at the temple, so that the patient&#39;s head may be advantageously stabilized both in keeping with the general medical principal that some patients&#39; injuries should be treated with head stabilization and also so that the head may be stabilized for application of the mandible engagement assemblies  108 .  FIG. 4  depicts the head stabilization assemblies  140  in a first position that is a beginning position. The beginning position is laterally spaced away from the patient and the head rests  150  are lowered.  FIG. 5  depicts both head stabilization assemblies  140  in a position to stabilize the patient&#39;s head; that is, each has been moved medially to a position where the patient&#39;s head may be engaged and each head rest  150  has been raised to a position selected by the user to best stabilize the patient&#39;s head, for example at the temple. 
         [0030]    Mandible rest assemblies are similar to the head stabilization assemblies in their adjustment mechanisms. The mandible rest assemblies also include a base block  160  and a riser  162 . The mandible rest themselves  114  are mounted on the risers  162  and extend medially inwards towards the patient and the patient&#39;s mandible. The mandible rest assemblies  108  also each slide medially and laterally along a slot  164  and may be locked in a user selected position by means of a fixating element (not shown) such as for example a set screw. The mandible rests (and head rests  150 ) may include cushions or pads for patient comfort. The pads may be removable for cleaning. The riser  162  may be raised and lowered along the vertical adjustment member  112 , which may be, as depicted, a vertical rod. When a user selected position of the mandible rest  114  has been reached, the mandible rest may be locked into position by a locking device, as for example in a depicted embodiment a torsion lever  166 . In this manner, the mandible rest  114  may be placed approximate to the dorsal aspect of the patient&#39;s mandible, that is the back of the jaw closest to the back plate  110 , and thereafter raised by raising the risers  162  along the vertical element  112 . The consequent lifting pressure on the patient&#39;s mandible will execute the advantageous maneuver of a jaw thrust. 
         [0031]    The force applied for a therapeutic jaw thrust may be in the range of from 2 to 18 pounds, and preferably about 8 pounds. Accordingly, components should be of sufficient strength to support and maintain such amounts of force. The vertical rods may be of sufficient height to maintain component positions exerting these force ranges on the patient, for example up to about 10 inches high for pediatric use. Materials for components may be any material capable of maintaining these forces, including for example plastics, fiberglass or metal such as stainless steel. 
         [0032]    In operation, a patient is placed on a backboard (not shown) which has the plate  110  either incorporated integrally into it or attached to it. As seen in  FIG. 8 , the patient&#39;s head is placed between the head support assemblies  140  and the mandible rest assemblies  108 . The head support assemblies  140  are moved medially and the head rest  150  are raised until stabilizing contact is made with the patient&#39;s head. Then adjustment locks such as for example set screws and the torsion levers  152  are set so that the head stabilization assemblies  140  are locked into position in engagement with the patient&#39;s head, immobilizing it. Thereby, the patient&#39;s head is stabilized in a manner advantageous for both general medical purposes, as for example in stabilizing the head of a suspected neck injury victim or multiple trauma victim, and for purposes of executing a jaw thrust to maintain a patent airway. Thereafter the chin strap  122 , which is non-elastic, is placed over the patient&#39;s chin and the length of the strap  122  is appropriately adjusted for the healthcare provider with adjustment means such as for example a buckle  120 . Next, the mandible adjustment assemblies  108  are each slid medially towards the patient&#39;s neck and mandible until the mandible rest  114  are engaged with the mandibular ramus, i.e., the back or dorsal aspect of the patient&#39;s mandible. Thereafter the risers  162  are elevated and slid along the vertical adjustment element  112  away from the back plate  110 . In so doing, the healthcare provider using the apparatus will execute the advantageous jaw thrust maneuver. Simultaneously with elevation away from the back plate  110  of the patient&#39;s mandible, the chin strap will prevent the ventral aspect of the patient&#39;s mandible, i.e., his chin, from rising with the rest of the mandible. The chin will accordingly move in the only direction available for it to move, which is to rotate away from the patient&#39;s maxilla towards the patient&#39;s chest. Thus, the upward movement of the mandible rest  114  and the consequent rotation affected by the restraint of the chin strap  122 , will automatically and advantageously execute the jaw thrust maneuver for maintaining a patient&#39;s airway. In order to aide in symmetrical application of all risers, the vertical members may include hash marks and/or calibrations  170 . 
         [0033]    After use removable cushions or pads  180  and  182  may be removed and either cleaned or disposed of and replaced. Other components may be cleaned after the pads are removed. 
         [0034]    As various modifications could be made to the exemplary embodiments, as described above with reference to the corresponding illustrations, without departing from the scope of the invention, it is intended that all matter contained in the foregoing description and shown in the accompanying drawings shall be interpreted as illustrative rather than limiting. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims appended hereto and their equivalents.