text: referring to fig1 , a lip implant for implantation into a lip of a patient ( not shown ) is generally referred to by reference numeral 10 . in one embodiment , the lip implant is integrally formed of medical grade silicone and is substantially solid as shown in the cross - section of fig2 . the implant can be manufactured by a variety of methods including , but not limited to , injection molding , cast molding , extrusion , or cutting from a larger , solid block . the lip implant 10 is formed to have a substantially uniform level of hardness as can be measured by the durometer a - scale rating . of course , hardness can be measured in manners other than via durometer a - scale ratings . in one embodiment , the lip implant 10 has a durometer rating of ten ( 10 ) or less resulting in a relatively soft lip implant . in such an embodiment , the lip implant 10 may include a skin 12 , also formed of silicone , having a higher durometer rating to provide the lip implant with structural integrity and manageability . accordingly , the provision of the skin 12 may aid in handling or manageability of the lip implant 10 . however , the provision for a skin 12 is not always necessary , and the lip implant 10 with a durometer rating of ten ( 10 ) or less may be used without the need for an external skin . of course , the particular durometer rating of the lip implant 10 may vary depending on the particular firmness desired . also , the lip implant 10 may have a varying durometer rating of 0 to 50 , resulting in a lip implant having a non - uniform hardness . the lip implant 10 is shaped to have a substantially circular cross - section ( fig2 ). the diameter of the lip implant 10 is substantially uniform along the longitudinal axis of a middle portion 14 of the lip implant . the diameter of the middle portion 14 of the lip implant 10 can vary depending on the desired thickness of the lip implant . for instance , the diameter of the lip implant 10 may be between 2 - 10 millimeters . the middle portion 14 of the lip implant 10 defines a pair of end portions 16 . the end portions 16 are tapered in diameter such that the diameter of the lip implant 10 along the end portions decreases from the middle portion 14 to the ends of the lip implant . the middle portion 14 and the end portions 16 of the lip implant 10 cooperate to define the length of the lip implant , which can vary depending on the desired length of the lip implant . for instance , the length of the lip implant 10 may be between 5 - 8 centimeters . referring to fig3 - 5 , a lip instrument for use in implanting the lip implant 10 is generally referred to by reference numeral 20 . the lip instrument 20 includes a pair of arms 22 a , 22 b coupled together at a pivot point 24 in any conventional manner to provide for relative pivotal movement of the arms about a pivotal axis p ( fig4 ). proximal to the pivotal axis p , the arms 22 a , 22 b include a pair of integrally formed ring - like members 26 a , 26 b , respectively , which define a pair of finger openings 28 a , 28 b . a pair of protrusions 30 a , 30 b extend towards one another from the ring - like members 26 a , 26 b , respectively , to prevent over - rotation of the arms 22 a , 22 b . distal to the pivotal axis p , the arms 22 a , 22 b include a pair of integrally formed curved clamping members 32 a , 32 b , respectively , which cooperate to grasp the lip implant 10 ( fig1 ) as will be further described with respect to the method of insertion . referring to fig5 , the clamping members 32 a , 32 b include an outer generally convex surface 34 a , 34 b , respectively , and a corresponding inner generally concave surface 36 a , 36 b . the inner surfaces 36 a , 36 b of the clamping members 32 a , 32 b face one another such that closing of the clamping members defines a generally circular area for grasping the lip implant 10 ( fig1 ). the inner surfaces 36 a , 36 b are formed of a non - crushing surface in order to prevent damage to the lip implant 10 ( fig1 ) when squeezed between the clamping members . in one embodiment , the inner surfaces 36 a , 36 b are formed of carbide . referring to fig6 , a lip region 40 of a patient ( not shown ) to receive the lip implant is depicted . the lip region 40 includes an upper lip 42 and a lower lip 44 , which meet at a pair of commissures 46 a , 46 b . the commissures 46 a , 46 b are substantially equidistant from a midline m of the lip region 40 . a tunnel 48 , as is generally illustrated in phantom in fig6 , is formed through the lower lip 44 for reasons to be described with respect to the method for insertion . in operation , referring to fig6 , the lip region 40 is prepared for insertion of the implant by administering a local or regional anesthetic . incisions are then made at each commissure 46 a , 46 b of the lip region 40 via a conventional scalpel or scissors . for sake of clarity , the method of insertion will be described with respect to insertion of the lip implant 10 into the lower lip 44 although it will be understood that the lip implant can be inserted into the upper lip 42 as well . initial formation of the tunnel 48 is then performed with conventional curved iris scissors ( not shown ). the iris scissors are inserted into the lower lip 44 via the incision at commissure 46 a to dissect the tunnel 48 towards the midline m of the lip region 40 . in a like manner , the iris scissors are then inserted through the incision at commissure 46 b on the opposite side of the lip region 40 to dissect the tunnel 48 towards the midline m of the lip region . such dissection culminates in the initial formation of the tunnel 48 through the lower lip 44 . the tunnel 48 is then widened via manipulation of the iris scissors or lip instrument 20 to complete the formation of the tunnel . after establishing the tunnel 48 , the lip instrument 20 is inserted into the lower lip 44 via the incision at commissure 46 a and the tunnel 48 such that the clamping members 32 a , 32 b extend through the tunnel enabling a portion of the clamping members to extend outside of the incision at commissure 46 b . the lip instrument 20 is then actuated to grasp the lip implant 10 between the clamping members 32 a , 32 b . the lip implant 10 is then drawn into the lower lip 44 via the lip instrument 20 until it is positioned appropriately within the tunnel 48 whereupon the lip implant is released from the lip instrument . a conventional suture , such as a chromic or nylon suture , is then used to close the incisions at commissures 46 a , 46 b . antibiotic ointment may be applied to the incisions at commissures 46 a , 46 b as a prophylaxis against infection . ice may be applied indirectly to the lip region 40 to reduce swelling . thus , as described , insertion of the lip implant 10 is accomplished simply and quickly and in an uninterrupted manner . thus , many of the problems associated with previous lip augmentation techniques can be eliminated with the use of the lip implant 10 . furthermore , this process is completely reversible if desired . it is understood that a variety of alternative lip implants are contemplated by this disclosure . for example , and referring now to fig7 , a lip implant 70 substantially similar in all respects to the lip implant 10 of fig1 and 2 , other than those features described below , has a middle portion 72 that includes a section 74 having a non - uniform diameter . in another alternative embodiment , and referring now to fig8 , a lip implant 80 substantially similar in all respects to the lip implant 10 of fig1 and 2 , other than those features described below , includes a middle portion 82 having a non - uniform diameter along the entire length of the middle portion . in yet another alternative embodiment , and referring now to fig9 , a lip implant 90 substantially similar in all respects to the lip implant 10 of fig1 and 2 , other than those features described below , is substantially non - uniform in diameter along the length of the implant . the lip implant 90 is reduced in diameter at a middle portion 92 thereof . in operation , the lip implants 70 , 80 and 90 of fig7 and 9 , respectively , are inserted into the lower lip 44 ( fig6 ) of the patient in a substantially similar manner as described above . thus , the embodiments of fig7 and 9 enjoy the advantages of that of fig1 with respect to providing a structurally sound and safe lip implant for lip augmentation purposes . in yet another alternative embodiment , and referring now to fig1 , an alternative lip implant 100 substantially similar in all respects to the lip implant 10 of fig1 and 2 , other than those features described below , is shaped to have a substantially elongated cross - section , which is substantially uniform in size along the length of the implant . in operation , the lip implant 100 is inserted into the lower lip 44 ( fig6 ) of the patient in a substantially similar manner as described above . after insertion into the lower lip 44 , the lip implant 100 may be further sized to correspond to the shape of the lip . for example , the ends of the lip implant 100 may be cut in a tapered fashion such that the lip implant is customized to the particular shapes and contours of the lower lip 44 . as can be appreciated , the materials used in forming the lip implants of the present disclosure can be varied to include additional materials for use with silicone or alternative materials other than silicone . for example , the lip implants 10 , 70 , 80 , 90 , 100 and other embodiments of the lip implant of the present disclosure may alternatively be formed of urethane rather than silicone . moreover , referring to fig1 a , an alternative lip implant 110 a includes an inner core region 112 a formed of expanded polytetraflouroethylene ( ptfe ) such as gore - tex ®, and an outer shell 114 a formed of silicone . the silicone used for the outer shell 114 a provides the lip implant 110 a with additional manageability . more importantly , the presence of the outer silicone shell 114 a aids in preventing tissue - adherence associated with the use of expanded ptfe . it is understood that other types of outer shells are contemplated for the lip implant 110 . for example , in some embodiments , the outer shell 114 a may be in the form of a polymer coating , such as parylene ™, which can be applied to the exterior of the inner core region 112 a to provide structural integrity and manageability . accordingly , any number of materials including but not limited to silicone , urethane , expanded ptfe , and biocompatible polymers , and any combination of such materials may be used to form the lip implant 110 a . in another embodiment , and referring to fig1 b , an alternative lip implant 110 b includes an inner core region 112 b formed of materials such as liquid silicone , silicone gel or beads , cohesive silicone gel or beads , biocompatible oil , saline or a biocompatible hydrogel material . the lip implant 110 b further includes an outer shell 114 b , which may be formed of a variety of materials including but not limited to silicone , urethane and biocompatible polymer ( such as parylene ™). as can be appreciated , the outer shell 114 b encloses the inner core region 112 b and may be formed in an impermeable or semipermeable manner such that there is minimal or no leakage of the inner core region 112 b through the outer shell . in still other embodiments , and referring to fig1 c , an alternative lip implant 110 c includes an inner core region 112 c , which may take the form of a hollow space defined by an outer shell 114 c . in such an embodiment , the inner core region 112 c can be filled with a gas such as air . moreover , the outer shell 114 c may be formed of a variety of materials including but not limited to silicone , urethane and biocompatible polymers . as can be appreciated , the outer shell 104 c may be formed in an impermeable manner such that there is no leakage of gas from the inner core region 112 c through the outer shell . while the invention has been particularly shown and described with reference to embodiments thereof , it is understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention . for example , although a plurality of shapes of the lip implant 10 is described , these shapes are merely representative of the variety of shapes that the lip implant may take . thus , the lip implant 10 is not limited to the longitudinal or cross - sectional shapes as described . moreover , the tapered end portions 16 of the lip implant 10 may be removed resulting in a lip implant having a rod - like shape . still further , the degree of taper and the length of the end portions 16 may be varied to accommodate the various desires or needs of implant patients . still further , the clamping members 32 a , 32 b of the lip instrument 20 may be removable attached to the lip instrument such that various other clamping members may be used therewith . for instance , various degrees of curvature may be required of the clamping members resulting in the need to interchange the clamping members . furthermore , the inner surfaces 36 a , 36 b of the clamping members 32 a , 32 b may be formed of a variety of materials other than carbide . still further , during insertion of the lip implant 10 into the lower lip 44 , the incision may be made in the general commissure region on each side of the lip region 40 and such insertion is not limited to an exact commissure point . it is also understood that all spatial references , such as “ diameter ”, “ longitudinal ,” “ increase ,” and “ decrease ” are for illustrative purposes only and can be varied within the scope of the invention . accordingly , all such modifications are intended to be included within the scope of this invention as defined in the following claims .