US3702028A

US3702028A - Dental implant extracting tool

Info

Publication number: US3702028A
Application number: US72606*[A
Authority: US
Inventors: Alfred E Edelman
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-11-07
Filing date: 1972-11-07
Publication date: 1972-11-07
Anticipated expiration: 1989-11-07

Abstract

A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head. The tool includes a shank having a lateral extension at one end thereof formed with a slot to receive the neck of an implant. A retainer is adjustably positioned on the shank to prevent disengagement of the implant neck from the slot. The other end of the shank is provided with an elongated handle having a weight slidable thereon against a stop, so that impacts may be delivered through the handle and shank to extract the implant from a patient''s jaw.

Description

United States Patent [151 3,702,028

Edelman 51 Nov. 7, 1972 [54] DENTAL IMPLANT EXTRACTING FOTLEIGN PATENTS OR APPLICATIONS TOOL llltth llll 1,013,392 8/1957 Germany ..32/6l Primary Examiner-Robert Peshock Attorney-Munson H. Lane and Munson H. Lane, Jr.

[5 7] ABSTRACT A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head. The tool includes a shank having a lateral extension at one end thereof formed with a slot to receive the neck of an implant. A retainer is adjustably positioned on the shank to prevent disengagement of the implant neck from the slot. The other end of the shank is provided with an elongated handle having a weight slidable thereon against a stop, so that impacts may be delivered through the handle and shank to extract the implant from a patients jaw.

P'A'IENTEDuuv 11m I I 3.702.028

I N VEN TOR ALFRED E. EDELMAN ATTORNEY DENTAL IMPLANT EXTRACTING TOOL This invention relates to new and useful improvements in tools or instruments for use with dental implants which are placed in the jaw bone of a patient to provide anchorage for artificial teeth, bridgework, and the like, such implants being of the type having a wide blade which is impact-driven into the jaw bone, a narrow neck on the blade, and an enlarged head on the neckto support the dentalwork.

On certain occasions it is desirable to install a tryin implant which has to be removed for replacement by another, and on other occasions it is necessary to remove an implant which has already served its purpose. In either event,'the principal object of the invention is to provide a special tool or instrument by which an implant may be quickly and easily extracted from a patients jaw. As such, the special tool of the invention is simple in construction, efficient in operation, and well suited for use with various sizes and designs of implants of the aforementioned type.

With the foregoing more important object and features in view and such objects and features which may become apparent as this specification proceeds, the invention will be understood from the following description taken in conjunction with the accompanying drawings, wherein like characters of reference designate like parts, and wherein:

FIG. 1 is an elevational view of the extracting tool of the invention, with the handle separated from the shank;

FIG. 2 is a side elevational view, taken from the left side of FIG. 1, showing the tool without the handle;

FIG. 3 is an enlarged plan view, taken from the plane of the line 3-3 in FIG. 1;

FIG. 4 is an enlarged sectional view, taken in the plane of the line 44 in FIG. 1;

FIG. 5 is a fragmentary perspective viewshowing the tool in readiness to be applied to a dental implant;

FIG. 6 is a perspective view showing the tool applied to the implant;

FIG. 7 is a fragmentary elevational view showing, by dotted lines, various possible angulations of the shank extension;

FIG. 8 is a fragmentary perspective view showing the tool in an inverted position; and

FIG. 9 is a view, similar to that in FIG. 8, but with the tool applied to an implant.

Referring now to the accompanying drawings in detail, the tool or instrument of the invention is designated generally by the reference numeral 10 and is especially adapted for use in extracting a dental implant 12 from the jaw bone 13 of a patient, as indicated in FIG. 5. The implant 12 is of the type which includes a wide blade 14 which is impact-driven into the jaw bone and is provided with a narrow neck 15 equipped with an enlarged head 16'.

The implant extracting tool 10 embodies in its construction an elongated shank 17 which, for most part, may be in the form of a flat strap, having one end portion thereof angulated to provide a lateral extension 17a. This extension may be at right angles to the shank, or at an acute or an obtuse angle thereto, as indicated at 17a and 17a respectively in FIG. 7, as may best be suited for manipulation of the tool in the patients mouth while affording clearance for protuberances such as lips, chin, nose, et cetera.

In any event, the shank extension 17a is provided with a slot 18 which is open at one side edge of the extension and extends inwardly therefrom, the slot 18 being adapted to receive the neck 15 of the implant 12 when the tool is in use. Preferably, the side edge portions of the extension 17a adjacent the slot 18 are bevelled as indicated at 19, to facilitate application of the tool to the implant.

In order to prevent the tool from becoming displaced from the implant while the tool is in use, a retainer 20 is provided on the shank 17 adjacent the extension 17a. The retainer 20 includes a channel portion 21 which is slidable on the shank 17 toward and away from the extension 17a and may be locked in an adjusted position by a locking screw 22. The latter extends through an elongated opening or slot 23 formed in the channel portion 21 and is threaded into the shank 17. The retainer 20 also includes a wing portion 24 which extends laterally from the channel portion 21- and is adapted to engage the blade 14 of the implant 12 when the retainer 20 is slid toward the shank extension 17a, as shown in FIGS. 6 and 9. In that position the wing portion 24 of the retainer 20 closes the open end of the slot 18 in the shank extension 17a and thus prevents the tool from becoming displaced from the neck 15 in the slot 18. The wing portion 24 is preferably triangularly shaped to afford clearance and prevent interference with the jaw of the patient.

The other or outer end of the shank l7, remote from the extension 17a, is enlarged to provide a boss 25 equipped with a screw-threaded post 26 which is engageable with a threaded bore 27 in one end of a cylindrical handle 28, whereby the shank 17 may be separably connected to the handle. The other or outer end of the handle 28 is provided with a screw-threaded stud 29 having a nut 30 and a washer 31 positioned thereon. A weight or hammer 32 is reciprocable on the handle 28, toward and away from the nut 30, and when the hammer 32 is slid toward the nut 30, it produces an impact in the direction of the arrow 32', that is, longitudinally outwardly of the handle 28 and of the shank 17 which is in longitudinal alignment with the handle. The washer 31 is of elastomeric material and serves as a shock absorber in somewhat cushioning the impact which would otherwise be produced if the hammer 32 were permitted to come in direct, positive contact with the nut 30.

When the tool is to be used, the retainer 20 is slid along the shank 17 away from the extension 17a so that the slot 18 in the extension is open and the tool may be applied to the dental implant 12 so that the neck 15 of the implant is received in the slot 18 of the tool. The retainer 20 is then slid toward the extension 17a so that it comes to a position where the wing portion 24 engages the blade 14 of the implant and also closes the slot 18 in the extension 17a, as aforesaid, thus in effect locking the tool to the implant and preventing their relative displacement while the tool is in use. The hammer 32 is then reciprocated along the handle 28 to impact the washer and

nut

31, 30 in the direction of the arrow 32, this impacting force being transmitted through the handle 28 and shank 17 to the shank extension 17a and thus to the neck 15 and head 16 of the implant 12, so that the implant is extracted from the patients jaw.

It will be apparent that since the handle 28 is separable from the shank 17 at the

connection

26, 27, the handle and the manually actuated hammer 32 may be substituted by some other suitable impact producing means such as a pneumatically, hydraulically or electrically powered hammer, attached to the post 26 of the shank l7.

It may be also noted that while in FIG. the tool is shown in readiness for being applied to the implant 12 in the patients jaw 13 which, in this instance, is the upper jaw requiring the implant to be extracted in the downward direction,-the tool is equally applicable for extracting implants upwardly from the lower jaw, simply by using the tool in an inverted position as for example in FIGS. 8 and 9.

While in the foregoing there has been described an shown the preferred embodiment of the invention, various modifications may be resorted to, falling within the spirit and scope of the appended claims.

What is claimed as new is: I

l. A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head, said tool comprising an elongated shank provided at one end thereof with a lateral extension having a narrow slot which is open at and extends inwardly from one edge of said lateral extension for receiving and closely engaging the neck of an implant, an implant retainer means positioned on said shank adjacent said extension and engageable with the blade of an implant at oneside of the neck so as to retain the latter in the slot of said extension, and impact producing means provided at the other end of said elongated shank for producing, an impact force longitudinally along said shank.

2. The device as defined in claim 1 which is further characterized in that saidretainer is slidable onsaid shank toward and away from said extension.

3. The device as defined in claim 2 together with means for locking said retainer in an adjusted position on said shank.

4. The device as defined in claim 1 wherein said retainer includes a channel portion slidable on said shank toward and away from said extension, and a wing portion projecting laterally from said channel portion, said wing portion being engageable with the blade of an implant.

5. A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head, said tool comprising a shank provided at one end thereof with a lateral extension having a slot therein for receiving the neck of an implant, implant retainer means positioned on said shank adjacent said extension andengageable with the blade of an implant at one side of the neck so as to retain the latter in the slot of said shank extension, impact producing means provided at the other endof said shank, said retainer including a channel portion slidable on said shank toward and I away from said extension, and a wing portion projectretainer. 6. A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head, said tool comprising a shank provided at one end thereof with a lateral extension having a slot therein for receiving the neck of an implant, implant retainer means positioned on said shank adjacent said extension and engageable with the blade of an implant at one side of the neck so as to retain the latter in the slot of said shank extension, and impact producing means provided at the other end of said shank, said slot being open at and extending inwardly from one side'edge of said shank extension, said retainer including a channel portion slidable on said shank toward and away from said extension, and a wing portion projecting laterally from said channel portion, said wing portion closing the open end of said slot when the retainer is slid toward said extension to engage the wing portion with the blade of an implant.

7. The device as defined in claim 6 together with means for locking said retainer in an adjusted position on said shank.

8. The device as defined in claim 1 wherein said impact producing means comprise an elongated handle provided at said other end of said shank in longitudinal alignment therewith, a stop at the outer end of said handle, and a weight reciprocable on the handle and impactingly engageable with said stop.

9. The device as defined in claim 8 together with a shock absorbing element providedon said handle at said stop for engagement by said weight.

10. A tool for extracting dental implants of the type having a body portion adapted to be embedded in the jaw bone, a head portion and a narrow neck connecting said head with said body portion, said tool comprising an elongated shank provided at one end thereof with a lateral extension having a slot therein for receiving the neck of an implant, and impact producing means provided at the other end of said elongated shank for producing an impact force longitudinally along said shank.

11. The tool set forth in claim 10 together with an implant retainer means positioned on said shank adjacent said extension and engageable with the blade of an implant at one side of the neck so as to retain the latter in the slot of said lateral extension.

UNITED STATES PATENT OFFICE CERTIFICATE OF (IQRREQ'HON Patent No. 3 702 .028 Dated November 7 1972 lnvent fls) ALFRED E. EDELMAN It is eertified that error appears in the above-identified patent and that said Letters, Patent are hereby corrected as shown below:

On Page 1 (cover page) between the listing of the inventor and the application Serial Number 72,606,

the filing date should read as follows:

Filed: September16; 1970 Signed and sealed this 8th day of May 1973.

(SEAL) attest:

EDLRRD i'LFLETCHER fi-L ROBERT GOTTSCHALK.

At'tes'ting Officer Commissioner of Patents FORM PO-105O (10-69) USCOMM-DC 60376-P69 U.S. GOVERNMENT PRINTING OFFICE: 1969 0-366-334,

Claims

1. A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head, said tool comprising an elongated shank provided at one end thereof with a lateral extension having a narrow slot which is open at and extends inwardly from one edge of said lateral extension for receiving and closely engaging the neck of an implant, an implant retainer means positioned on said shank adjacent said extension and engageable with the blade of an implant at one side of the neck so as to retain the latter in the slot of said extension, and impact producing means provided at the other end of said elongated shank for producing an impact force longitudinally along said shank.

2. The device as defined in claim 1 which is further characterized in that said retainer is slidable on said shank toward and away from said extension.

5. A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head, said tool comprising a shank provided at one end thereof with a lateral extension having a slot therein for receiving the neck of an implant, implant retainer means positioned on said shank adjacent said extension and engageable with the blade of an implant at one side of the neck so as to retain the latter in the slot of said shank extension, impact producing means provided at the other end of said shank, said retainer including a channel portion slidable on said shank toward and away from said extension, and a wing portion projecting laterally from said channel portion, said wing portion being engageable with the blade of an implant, and means for locking said retainer in an adjusted position on said shank, said means comprising a locking screw provided on the shank and extending through an elongated opening formed in the channel portion of the retainer.

6. A tool for extracting dental implants of the type having a wide blade, a narrow neck and an enlarged head, said tool comprising a shank provided at one end thereof with a lateral extension having a slot therein for receiving the neck of an implant, implant retainer means positioned on said shank adjacent said extension and engageable with the blade of an implant at one side of the neck so as to retain the latter in the slot of said shank extension, and impact producing means provided at the other end of said shank, said slot being open at and extending inwardly from one side edge of said shank extension, said retainer including a channel portion slidable on said shank toward and away from said extension, and a wing portion projecting laterally from said channel portion, said wing portion closing the open end of said slot when the retainer is slid toward said extension to engage the wing portion with the blade of an implant.

9. The device as defined in claim 8 together with a shock absorbing element provided on said handle at said stop for engagement by said weight.