Abstract: A trocar sleeve comprises a flexible hollow shaft comprising a distal end and a proximal end, and a handling head that is formed at the proximal end of the hollow shaft. The trocar sleeve is manufactured from an elastomer material. The hollow shaft comprises an inner contour that is adapted to an outer contour of a trocar mandrel in such a way that the trocar sleeve and the trocar mandrel are arranged to be coupled to one another while generating a defined preload to stabilize the trocar sleeve. A trocar system comprises a trocar sleeve and a trocar mandrel that is arranged to be inserted in the trocar sleeve, while generating a defined preloading in the trocar sleeve. A method of manufacturing a trocar sleeve involves integrally forming a hollow shaft and a handling head in a common mold by molding.

Abstract: A courier airway device includes a tubular structure that defines a central channel through which a medical diagnostic or therapeutic device can be inserted. The tubular structure also defines a ventilation duct for providing gases from a controlled ventilation machine to a patient. A cuff is attached to the central channel. Characteristically, the cuff is an inflatable balloon-like ring.

Abstract: A tricuspid insufficiency treatment device includes a vena cava member (12) implantable in a vena cava of a patient. The vena cava member (12) is formed with a fenestration (14) and further includes a blocking member (16) arranged to block and unblock the fenestration (14).

Abstract: A tracheostomy tube assembly includes an outer tube (1) and an inner cannula (2) inserted in the outer tube. Two lugs (36) and (37) project outwardly from the inner cannula. The outer tube has a connector (15) that is rotatable and has catch members (28) and (29) that can be rotated into alignment with the lugs (36) and (37) on the inner cannula so as to retain the inner cannula in the outer tube. The inner cannula is removed by twisting the connector (15) through 90° so that the catch members (28) (and 29) move out of alignment with the lugs (36) and (37) to enable the inner cannula to be pulled rearwardly out of the outer tube.

Abstract: An endotracheal tube (ETT) system and methods are provided. In at least one example, an ETT system may comprise, a tube, inflatable cuff coupled to the tube, and a restrictor. In at least one example the restrictor may comprise one more cavities. In a further example, a restrictor drainage assembly may be coupled to the restrictor, the restrictor drainage assembly configured to drain secretions that may be collected at a collection point formed by the restrictor when the ETT system is positioned in an airway of a patient and in an inflated state.

Abstract: The present disclosure relates to a system and method for use of acoustic reflectometry information in ventilation devices. The system and method includes a speaker to emit sound waves into an intubated endotracheal tube (“ETT”) and a microphone to detect returning acoustic reflections. In addition, the system and method includes a reflectometry device in communication with a ventilation device for analyzing timings and amplitudes of the returning acoustic reflections to determine a size of a passageway around an ETT tip, location and size of ETT obstructions, and relative movement of the ETT tip within a trachea. The reflectometry device is also configured to determine a resistance parameter representative of resistance to actual flow of air through the ETT based upon a function of the diameter of the ETT, length of the ETT, and percent obstruction of the ETT, where the resistance parameter is used to calculate the tracheal pressure.

Abstract: Ventilator associated pneumonia (VAP) may be prevented in a patient, or its occurrence reduced in a population of patients, by using an anti-VAP device or an anti-VAP material such as an anti-VAP mouthpiece that absorbs secretions. By reducing the problem of bacterial-containing secretions that otherwise build up in the airway of, and elsewhere in, the intubated patient, VAP can be prevented from occurring in intubated patients, such as patients intubated with an endotracheal tube (ETT) or a nasogastric tube. Anti-VAP mouthpieces also are useable in non-intubated patients to maintain oral hygiene.

Abstract: A method and apparatus for determining the optimal endotracheal tube size for the intubation of a patient based upon both optimal tube length and optimal tube diameter which are determined by using either direct or indirect measurement devices or techniques to measure the patient's glottis aperture and tracheal length. The apparatus may include a maneuverable arm, a fiber optic video guidance system and an introducer guide to maneuver an end of the apparatus around obstructions in a patient who has a difficult airway to facilitate insertion of either an optimally sized endotracheal tube or a standard endotracheal tube into the patient's airway.

Abstract: An endoscopy device (1) for facilitating use of an endoscope, comprising at least one airway tube (2) and a mask (3) having a distal end (4), a proximal end (5) and a peripheral formation ??) capable of conforming to, and fitting within, the actual and potential space behind the larynx of the patient to form a seal around the circumference of the laryngeal inlet, the peripheral formation (6) establishing separation between a laryngeal; chamber side (3a) and a pharyngeal side (3b), the device further comprising a conduit (8) adapted for passage of an endoscope into the oesophagus of a patient when mask (3) is in place, conduit (8) including a distal end for cooperation with the oesophageal sphincter, the conduit having a laryngeal side (8d), a pharyngeal side (8c), a right side (8e) and a left side (8f), and an outlet wherein at the outlet the width between the left side and the right side is smaller than the width of the conduit.

Abstract: Embodiments may include an expandable access system having contracted and expanded configurations. The system and methods may include an expandable access device having a helix or wrapped shape. Embodiments may include a cannula, stent, needle, trocar, introducer, fastener, and/or any other devices disclosed herein. Embodiments may also include an expandable trocar positionable in at least a portion of the access device. A sleeve or band may be disposed over at least a portion of the access device and configured to resist radial expansion of the access device. Expansion of the trocar and/or receipt of an object may radially expand the access device between a contracted configuration and an expanded configuration.

Abstract: Oral airway devices having a tubal body curved anteriorly and comprising a central lumen and one or more peripheral hollow passages for hosting a camera and/or one or more tools including a gastric suction tube, including oral airway devices in which the tubal body ends with a tongue and the wall of the tubal body encircles a central lumen. Oral airway devices also include those which comprise three channels, two of which are peripheral channels located in the flanks of the wall of the tubal body, the oral airway devices being compatible with a laryngoscope. Methods for ventilating, intubating and extubating a patient with the medical devices.

Abstract: One aspect of the present disclosure relates to a reversible airway device for ventilating a subject. The airway device can comprise a laryngeal tube, an endotracheal tube, and a sealing mechanism. The laryngeal tube can include a tubular guide having a distal end portion, a proximal end portion, and a first passageway extending between the distal and proximal end portions. The laryngeal tube can further include axially spaced apart distal and proximal cuffs coupled thereto. The endotracheal tube can be slidably disposed within the first passageway. The endotracheal tube can have a second passageway that is disposed within the first passageway. The sealing mechanism can be disposed within the first passageway and configured to occlude the flow of gas through the first passageway.

Abstract: Provided is a catheter fixture. The catheter fixture includes: a base plate having a base hole for passing a catheter; and a fixture body formed on a top of the base plate, and the fixture body having a first guide hole connected to the base hole, extending in an open direction of the base hole, and guiding the catheter and a second guide hole extending in a different direction from the first guide hole and guiding the catheter. Since the first guide hole and the second guide hole are formed in different directions in the catheter fixture, a user can extend the catheter in different directions if necessary. Accordingly, it is possible to more stably and simply prevent backflow of food or medicine, using one catheter fixture without a specific component.

Abstract: A tracheostomy tube (1) has a movable and lockable flange (2) by which the tube can be supported about the neck of a patient. The flange has a rotatable locking ring (34), which is threaded with a housing (26) fixed with the wings (22 and 23) of the flange. A resilient sleeve (50) is located in a recess (44) of the locking ring between a compression surface (45) on the locking ring at one end and the floor (46) of the housing at the opposite end. When the locking ring (34) is twisted it is moved forwardly along the housing (26), thereby compressing the resilient sleeve (50) axially. The axial compression causes the sleeve (50) to expand radially against the outside of the tube (1) and the inside of the housing (26), thereby locking the flange (2) in position.

Abstract: Intubation devices and methods of intubating a patient are provided. The intubation devices include a laryngeal mask airway (LMA) component having a mask portion and a tube portion and an endotracheal tube (ETT) component positioned in the laryngeal mask airway (LMA) component having a translatable and/or rotatable endotracheal tube. The endotracheal tube can be translated and/or rotated by a manipulation rod extending through the laryngeal mask airway (LMA) component and mounted to the endotracheal tube (ETT). The intubation devices may include inflatable cuffs adapted to manipulate the positioning or orientation of the endotracheal tube and/or to seal openings about the endotracheal tubes. Various ports, passages, and conduits are provided to enhance the use and manipulation of the intubation device.

Abstract: An accessory device introduction system works in conjunction with an endoscope and enables more than one accessory device to be used at the same time. The system has a plurality of channels which only expand to accommodate said accessory device(s) when introduced. The system further includes an attachment assembly which connects securely to the endoscope by means of a compression friction fit between the endoscope and itself. The attachment assembly also provides at least one accessory port to be presented to an end user to enable the end user to pass an accessory device within said accessory port and channel. The system further includes a multi-channeled endoscope shaft sheath which is connected to the attachment assembly at one end and the distal end of the endoscope shaft at the other end, thereby covering an entire outer shaft diameter length. The shaft sheath has a plurality of channels which correspond to those of the attachment assembly.

Abstract: A method involves using a camera tube in connection with a laryngeal mask. The camera tube cooperates with an intubation stylet. The camera tube is an elongate member having a length extending between opposite distal and proximal ends. The distal end of the camera tube has a camera. The camera tube has an exterior surface and an intubation stylet guide support surface extending radially outward from the exterior surface along a portion of the length adjacent to the distal end. The intubation stylet guide support surface is configured to cooperate with an intubation stylet. The user may manipulate the proximal end of the camera tube to change the orientation of the intubation stylet with in the laryngeal mask while using the camera to visualize the patient's laryngeal opening. Once the intubation stylet is aligned with the patient's laryngeal opening, the intubation stylet may be advanced therethrough.

Abstract: An airway management device comprising a body having a proximal end for receiving an oxygen supply tube and an distal end for insertion into a trachea of a patient; said body including a linear portion adjacent to the proximal end and a curved portion adjacent to the distal end; said body including an external shell and having a first bore through said shell for receiving the oxygen supply tube; wherein flexural strength for said airway management device is provided by said shell.

Abstract: A laryngeal mask apparatus to ventilate a patient and also suck in fluids and secretions in the patient's hypopharyngeal region. The laryngeal mask apparatus has a mask, a flexible breathing tube in communication with the mask and a suction tube which has a plurality of suctioning ports that face the back of the patient's throat when the mask is inserted into the patient's throat. When suction is created within the suction tube, fluids and secretions in the patient's hypopharyngeal region are sucked into the plurality of suction ports. The laryngeal mask apparatus also has a flexible air capillary tube positioned within the interior of the suction tube to provide an air flow that decreases the direct suction forces on the mucosa of the patient's throat that are caused by the suction of the plurality of suction ports.

Abstract: A bi-directionally articulable endotracheal tube includes an articulator with a lever, pivoted on a bite block that, via two attached diametrical wires threaded through the tube wall, controls an articulee with two asymmetric notches sequestrated by three nested, specialized cuffs. A connector having an oval cross-section can effectively house and stopper a video stylet whose flexible tip is nimbly responsive to the articulator. The endotracheal tube can be partially styletted for routine intubation in a direct or video laryngoscopy, or video styletted as a ubiquitous alternative to intubative fiber optic bronchoscope and in combination with a video laryngoscope for dual imaging intubation.

Abstract: A method for intubation of a patient comprising: providing an LMA and an endotracheal tube, wherein the endotracheal tube comprises a visualization device and wherein the endotracheal tube is adapted for passing through the LMA; positioning the LMA in the patient; and guiding the endotracheal tube with the aid of the visualization device through the LMA for positioning in the trachea of the patient. The method preferably further comprises removing the LMA from the patient following the positioning of the endotracheal tube while leaving the endotracheal tube in position.

Abstract: Disclosed is an apparatus and method to facilitate insertion of the endotracheal tube into the patient's trachea.

Abstract: A bougie for insertion in a patient, the bougie including: (i) a main shaft having proximal and distal ends and a bore extending axially therein; (ii) a movable tip having proximal and distal ends, the proximal end of the movable tip being connected to the distal end of the main shaft; (iii) a control member having proximal and distal ends, the control member being mounted for sliding movement in the bore of the main shaft; and (iv) the distal end of the control member being coupled to the distal end of the movable tip, the arrangement being such that an operator can slide the control member relative to the main shaft so as to cause displacement of the tip relative to the axial direction of the main shaft.

Abstract: A novel nasogastric tube, that when properly inserted within a person, blocks the esophagus of the person to prevent gastric contents from being aspirated. The tube can be left in place during direct langroscopy and the device can include a preferably inflatable balloon for obstructing the person's esophagus. This balloon can be preferably provided on a slidable tube that allows for head movement/flexion without movement of the balloon placement. The tube can be a dual or single lumen device. With a duel lumen device, a first lumen can be connected to a suction tubing to suction gastric contents from the distal end of the tube, while the other lumen can open up above the cuff to allow for easier ventilation with a bag valve mask/BVM.

Abstract: A video laryngoscope and elongate laryngoscope insertion section for a video laryngoscope, comprising a viewing port through which an imaging device within the insertion section can obtain images of a larynx, the insertion section extending between a distal end for insertion into a subject and an opposite proximal end, and having an inferior surface and an opposed superior surface, wherein the insertion section comprises a proximal region where the insertion section extends through a subject's teeth in use, a distal region extending to the distal end and an intermediate region therebetween, wherein the inferior surface of the insertion section comprises or consists of a curved region which extends from the proximal region through the intermediate region to the distal region, wherein the curved region of the inferior surface is continuously longitudinally curved along the length of the longitudinally curved region and wherein the longitudinal curvature of the curved region of the inferior surface varies in the

Abstract: A valve (2) comprising: (a) membrane (50) and (b) a frame (10) in communication with the membrane so that the frame expands the membrane, the frame including: (i) a rod (4), (ii) a plurality of struts (12) connected to the rod at a distal end and extending generally radially outward as the struts extend away from the distal end and towards a proximal end; (iii) a plurality of anchors (30) that are in direct communication with the struts between the distal end and the proximal end, each of the plurality of anchors extending through an exit location (52) in the membrane.

Abstract: An insertion guide facilitates insertion of an endotracheal tube (ETT) into the trachea of a patient instead of the esophagus of the patient. The ETT includes an elongated, somewhat flexible, generally hollow tube and the insertion guide includes an elongated, solid and relatively rigid shaft that is configured to be positioned within the hollow tube of the ETT. The shaft is provided with a radiused portion and/or an angled portion adjacent a distal end of the insertion guide that protrudes outwardly beyond a distal end of the ETT. The radiused portion and/or the angled portion of the shaft facilitate insertion of the distal end of the ETT past the epiglottis and into the trachea of the patient instead of into the esophagus of the patient.

Abstract: A retainer includes a first arcuate wall and a second arcuate wall that together define a channel designed to receive a medical article. The retainer has an open configuration wherein a first end of the first arcuate wall is spaced away from a first end of the second arcuate wall, and a closed configuration wherein the first end of the first arcuate wall is adjacent the first end of the second arcuate wall. A second end of the first arcuate wall opposite the first end of the arcuate wall may be spaced away from the base in the open configuration and pressed against the base in the closed configuration. The retainer also may include a first support and a second support fixed to the base, and a first and second flexible coupling connecting the first and second supports to the first and second arcuate walls.

Abstract: Medical devices and methods of using medical devices are described herein. More particularly, the disclosure relates to introducers suitable for providing access to a body vessel and methods of using introducers. An example introducer comprises a sheath and a dilator moveably disposed within the sheath. The distal end of the dilator has a closed configuration and an open configuration and movement between the open and closed configurations can be accomplished by applying a proximally-directed force on the sheath such that the sheath moves in a proximal direction relative to the dilator.

Abstract: A catheter mount is configured to be attached to a respiratory apparatus. The catheter mount includes a plurality of ports in fluid communication with each other. The plurality of ports include an interface poll configured to connect to an interface tube, a conduit port configured to connect to a conduit tube, and at least one suction port configured to allow insertion of a suction catheter. The at least one suction port can be positioned to allow the suction catheter, when inserted, access to both the interface port and conduit port.

Abstract: An oropharyngeal airway for use during diagnostic and surgical procedures, comprising a body with a proximal and a distal end. The distal end is sized for insertion through a protective bite block disposed in a patient's mouth. Both sides of the distal end are tapered to a curved distal edge. A flange is transversely opposed at the proximal end, preventing the proximal end from moving through the protective bite block and into the patient's mouth. An elliptically-arched channel in the shape of a lingual contour extends from the proximal end to the distal end. The channel includes a pair of tapered upstanding walls that guide the passage of a surgical instrument through the space between them. The oropharyngeal airway can be constructed of recyclable or biodegradable materials and is compatible with protective bite blocks of all sizes.

Abstract: A stabilization clip for use in securing an orogastric feeding tube to an endotracheal tube, including a base having a first end and a second end, wherein the base includes an orogastric feeding tube holder and an endotracheal tube holder such that the endotracheal tube holder is located adjacent to the orogastric feeding tube holder, a hinge operatively connected to a first end of the base, a flexible arm having a first end and a second end such that the first end of the flexible arm is operatively connected to the hinge, a locking mechanism located on the second end of the base, and an extension located on the second end of the flexible arm, wherein when the extension is located within the locking mechanism, the clip secures the orogastric feeding tube to the endotracheal tube.

Abstract: The invention relates to a urine flow control system (50) including a catheter device (10, 100) for insertion into a urethra, the catheter device (10, 100) having: a proximal end portion (14) and an opposite distal end portion (16, 102), a conduit (C) between said proximal end portion (14) and said distal end portion (16) having a urine inlet opening (2) at said proximal end portion (14) and a urine outlet opening (4, P) at said distal end portion (16, 102), and a magnetically actuatable valve located at said distal end portion (16, 102) for controlled discharge of urine from said catheter device (10, 100) through said outlet opening (4, P), and a magnetic actuator device with an actuator magnet (201), separate from said catheter device (10, 100), for operating said valve, characterized in said magnetic actuator device (200) comprising a housing (205) for receiving urine discharged from said catheter device (10, 100), said housing (205) having a first open end (202) configured for receiving said distal end po

Abstract: A saliva injector appliance that includes an elongate member having a scoop with channels at its distal end. Clamps or the like hold the appliance against and to a saliva ejector such that the end of the injector is spaced a small distance rearward from the end of the scoop, and the scoop and the channels direct fluid into the injector and push tissue out of the way during a dental procedure. The elongate member has a rigid or semi-rigid construction and holds the saliva ejector at the desired position and angle as directed by a practitioner grasping the rear handle portion of the elongate member.

Abstract: A laryngeal mask airway (LMA) device is provided, which includes an inflatable annular cuff, a backplate attached to the cuff, and an airway tube. The cuff, when disposed in free space, is characterized by a pressure-volume curve that represents the pressure in the cuff when inflated to different volumes of the cuff that include a low-pressure volume corresponding to a low pressure of 10 cm H2O. The pressure-volume curve includes (a) a local maximum pressure at a medium volume of the cuff between 1.25 and 2.4 times the low-pressure volume, wherein the local maximum pressure is between 15 and 120 cm H2O, and (b) respective high-volume medium pressures corresponding to all high volumes of the cuff that are between 2.5 and 3 times the low-pressure volume. Each of the high-volume medium pressures is between 15 cm H2O and 99% of the local maximum pressure. Other embodiments are also described.

Abstract: A medical device and medical method. The medical device includes a flexible elongate body defining a proximal end and a distal end. The elongate body defines a first lumen spanning from the proximal end to a location proximal to the distal end. A shaping member insertable within the first lumen is included, the shaping member is configured to retain a manipulated shape when the flexible elongate body is manipulated from a first configuration to a second configuration. A tip is coupled to the distal end.

Abstract: A retractor used in inner-oral surgery is provided that includes a maxilla portion configured to maintain a patient's mount in an open state. The retractor also includes a blade that maintains the position of the tongue so that surgical tools are not obstructed. The maxilla portion of one embodiment only extends a portion of the length of the blade.

Abstract: An airway device is provided for opening a patient's airway. In an embodiment, the airway device provides dual tubes which allow the patient to breathe on his/her own, to be ventilated, or to be intubated. The airway device includes a camera which provides constant visualization of the patient's tissues during insertion of the airway device and during the entire medical procedure. In some embodiments, the airway device includes an endotracheal tube. A transmission lumen monitors heart and breath sounds. Information from the camera and the transmission lumen is relayed to a microprocessor to allow for monitoring which may be remote.

Abstract: A tracheal tube assembly includes an outer cannula configured to be positioned in a patient airway and an inner cannula configured to be disposed inside the outer cannula. The tracheal tube assembly further includes a flange member secured about the outer cannula, and an outer cannula connector coupled to a proximal end of the outer cannula. The outer cannula connector includes a compressible portion may be compressed while inserting or removing the inner cannula.

Abstract: The present invention provide a pre-shaped port, at least partially introduced into a body cavity, comprising a body characterized by a distal end and a proximal end; said body comprising at least one throughgoing channel enabling introduction of at least one surgical tool; said distal end comprises at least one extension; wherein said extension is adapted to provide mechanical support to a distally located organ within said body cavity.

Abstract: An oral airway includes a tubular body having a first end and a second end, and defining a first portion of an air flow channel, and a leg extending outwardly from the first end of the body, the leg defining a second portion of the air flow channel.

Abstract: A method of opening an airway of a patient by a medical professional in a medical procedure using an airway device is provided. The airway device includes a ventilating tube and an intubating tube, and a camera lumen attached to one of the tubes. A camera is inserted into the camera lumen, and the camera provides visual information to the medical professional about the tissues of the patient during the medical procedure. The airway device is inserted into the throat of the patient and positioned proximally of the vocal folds under visual monitoring by use of the camera. The camera provides constant visualization of the patient's tissues during insertion of the airway device and during the entire medical procedure.

Abstract: An expandable implant for treating bone preferably in a minimally invasive manner includes a preferably cylindrical core element extending along a longitudinal axis and preferably a plurality of nestable, expandable sleeves extending along a longitudinal axis for placement radially about the core element. The plurality of nestable sleeves are sequentially insertable over the core element in such a manner that a first nestable sleeve is inserted over the core element and each subsequently inserted nestable sleeve is received between the core element and the previously inserted nestable sleeve such that the insertion of each additional sleeve causes each previously inserted sleeve to outwardly expand.

Abstract: An introducer for providing access to the interior of the heart generally includes a valve, a shaft, and a piercing element. The valve has a substantially closed state in the absence of an instrument inside the valve and an open state in the presence of the instrument inside the valve. The shaft has first and second ends. The piercing element is located at the first end of the shaft. The shaft is removably positioned inside the valve in an assembled condition. The valve is dimensioned to receive the instrument therein upon removal of the shaft from the valve.

Abstract: An apparatus for endotracheal intubation. The apparatus allows medical personnel to grip and stabilize a bougie inside the apparatus and maintain a curve position during intubation processes. The apparatus can be used for a solid bougie and/or a hollow bougie. The apparatus may further have a connector for connecting the apparatus to an external suction device or oxygen delivery device.

Abstract: A valved nasal cannula adapted to provide a positive pressure in the airway using the breathing of the intended user as a source of positive pressure without the need for an external source of energy and/or compressed air. The cannula is designed so as to be relatively easily insertable and retractable into and from the nasal vestibule portion of the nose of the intended user without requiring manual dexterity.

Abstract: A respiratory assembly is provided. The assembly includes at least one post having a nasal engaging portion on about a first end thereof for delivering treatment gases to the nasal cavity of a patient. A pair of tubes capable of receiving gas from a hose or fluid source are selectively engaged with the pair of posts for delivering treatment gases from the inlet through the receptacle and into the nasal cavity of the patient. A splitter may be positioned between the hose or fluid source and the pair of tubes. Ball and socket joints may provide enhanced flexibility of the assembly while in use.

Abstract: Systems and methods for respiratory therapy are disclosed. The system may include a nebulizer, an adaptor, and a nasal cannula. The nebulizer is operable to generate an aerosolized medicament and pass the aerosolized medicament through a nebulizer outlet port. The adaptor has a nebulizer coupling port configured to be coupled to the nebulizer outlet port. The nasal cannula is configured to provide a flow of breathing gas from a breathing gas source to the patient. The nasal cannula comprises at least one nasal prong and an attachment device positioned adjacent the at least one nasal prong. The attachment device is configured to secure the adaptor outlet port adjacent an outlet of the nasal prong. The method includes securing a nasal cannula to the patient, attaching an adaptor to the nasal cannula, generating an aerosolized medicament, transferring the aerosolized medicament into the adaptor, and providing a flow of breathing gas to the patient.

Abstract: A retractor used in inner-oral surgery is provided that includes a maxilla portion configured to maintain a patient's mount in an open state. The retractor also includes a blade that maintains the position of the tongue so that surgical tools are not obstructed. The maxilla portion of one embodiment only extends a portion of the length of the blade.

Abstract: An integrated medical bite block is engaged by a user's teeth and installed into the user's mouth. The bite block includes a through passageway, an upper grove, and a lower grove. The through passageway is penetrating through the bite block. One end of the through passageway comprises an inlet opening, the other end comprises an oral opening. The oral opening is connected with the user's mouth. An upper surface of the bite block provides the upper grove configured for receiving one or more upper teeth (maxillary teeth) of the user, and a lower surface of the bite block provides a lower grove configured for receiving one or more lower teeth (mandibular teeth) of the user. One distance between the lower grove and the oral opening is greater than the other distance between the upper grove and the oral opening, thereby the invention serves to extend forward the mandible and reposition a malposition between the mandible and the maxilla of the user.