Patent US20020032447A1 successfully refreshed from Google Patents.
US3626935A
Expired / Lapsed
US
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Surgical nail extractor
Assignee: Motors Liquidation Co
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Filing: 1969-08-12
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Granted: 1971-12-14
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Expires: 1989-08-12
Abstract
Abstract An extractor for removing a broken portion of an intramedullary nail includes an inner rod member and an outer concentric tubular member, each having a pair of axially extending fingers at one end. The fingers are arranged in respective pairs and each finger of such pair includes a pin having a portion extending beyond the inner surface of the finger, with the projecting portions of the pins axially and circumferentially converging with respect to each other. The other end of the inner member is secured to a drum rotatably and slidably received within a housing secured to the other end of the outer member. Fixed handles on the housing have their inner ends extending into an annular groove of the drum to limit axial movement of the drum and inner member relative to the housing and outer member. A manually rotatable handle on the housing has its inner end engaging the wall of an axially extending groove in the drum to rotate the drum and housing and the inner and outer members relative to each other and bring the projecting portions of the pins into clamping engagement with a land of the cruciform cross sectionally shaped nail. The inner member also includes an end anvil which can be used to shift the broken portion of the nail within the medulla to free the nail for easier removal. A handle assembly secured to the drum permits attachment of conventional instruments which apply intermittent axial driving forces to the inner member.
Inventors
- 👤 Samuel C Pollock
- 👤 Matthew K Shields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:44
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/92; A61B17/921; Y; Y10; Y10T; Y10T279/00; Y10T279/35
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
An extractor for removing from a skeletal member cavity an intramedullary nail having a portion of generally cruciform cross section comprising, in combination, a pair of annular telescopic and rotatable members, each including a plurality of generally axially extending finger means at one end thereof arranged in respective annularly spaced pairs, each pair of finger means adapted to axially receive a respective land of the nail therebetween, means for rotating the members relative to each other to move the finger means of each respective pair circumferentially toward each other to grip the respective nail land circUmferentially therebetween, and means for applying an axial force to the members to remove the gripped nail and members from the skeletal member cavity.
Claim 2
Dependent Claim
119 words
An extractor for removing from a skeletal member cavity an intramedullary nail having a portion of generally cruciform cross section comprising, in combination, a pair of annular telescopic and rotatable members, each including a plurality of generally axially extending finger means at one end thereof arranged in respective annularly spaced pairs, each pair of finger means adapted to axially receive a respective land of the nail therebetween, means for rotating the members relative to each other to move the finger means of each respective pair circumferentially toward each other to grip the respective nail land circUmferentially therebetween, and means for applying an axial force to the members to remove the gripped nail and members from the skeletal member cavity.
Claim 3
Dependent Claim
138 words
An extractor for removing from a skeletal member cavity an intramedullary nail having a portion of generally cruciform cross section comprising, in combination, a pair of annular telescopic and rotatable members, each including a plurality of generally axially extending fingers at one end thereof arranged in respective annularly spaced pairs, each pair of fingers including coacting gripping means adapted to axially receive a land of the nail therebetween, a radially facing axially extending abutment on one member, means on the other member engageable with the abutment for rotating the members relative to each other to move the fingers of each respective pair toward each other to move the gripping means into engagement with the nail land, and means for applying an axial force to the members to remove the gripped nail and members from the skeletal member cavity.
Claim 4
Dependent Claim
138 words
An extractor for removing from a skeletal member cavity an intramedullary nail having a portion of generally cruciform cross section comprising, in combination, a pair of annular telescopic and rotatable members, each including a plurality of generally axially extending fingers at one end thereof arranged in respective annularly spaced pairs, each pair of fingers including coacting gripping means adapted to axially receive a land of the nail therebetween, a radially facing axially extending abutment on one member, means on the other member engageable with the abutment for rotating the members relative to each other to move the fingers of each respective pair toward each other to move the gripping means into engagement with the nail land, and means for applying an axial force to the members to remove the gripped nail and members from the skeletal member cavity.
Claim 5
Dependent Claim
164 words
An extractor for removing from a skeletal member cavity an intramedullary nail of generally cruciform cross section having an end portion and a ribbed portion wedged into the cavity wall comprising, in combination, a pair of annular telescopic and rotatable members, means on the end of one member engageable with the end portion of the nail to axially shift the nail within the cavity and cause the ribbed portion to broach the cavity wall and free itself therefrom, each member including a plurality of generally axially extending finger means at the one end thereof arranged in respective annularly spaced pairs, each pair of finger means adapted to axially receive a land of the nail therebetween, means for rotating the members relative to each other to move the finger means of each respective pair toward each other to grip the nail land therebetween, and means for applying an axial force to the members to remove the gripped nail and members from the skeletal member cavity.
Claim 6
Dependent Claim
164 words
An extractor for removing from a skeletal member cavity an intramedullary nail of generally cruciform cross section having an end portion and a ribbed portion wedged into the cavity wall comprising, in combination, a pair of annular telescopic and rotatable members, means on the end of one member engageable with the end portion of the nail to axially shift the nail within the cavity and cause the ribbed portion to broach the cavity wall and free itself therefrom, each member including a plurality of generally axially extending finger means at the one end thereof arranged in respective annularly spaced pairs, each pair of finger means adapted to axially receive a land of the nail therebetween, means for rotating the members relative to each other to move the finger means of each respective pair toward each other to grip the nail land therebetween, and means for applying an axial force to the members to remove the gripped nail and members from the skeletal member cavity.
Claim 7
Dependent Claim
150 words
An extractor for removing from a skeletal member cavity an intramedullary nail having a portion of generally cruciform cross section comprising, in combination, a pair of annular telescopic and rotatable members, each including a plurality of generally axially extending fingers at one end thereof arranged in respective annularly spaced pairs, each respective pair of fingers being adapted to axially receive a land of the nail therebetween, an axially extending gripping member on each finger, the gripping member on respective pairs extending axially and circumferentially convergent to each other, means for rotating the members relative to each other to move the fingers of each respective pair toward each other and engage the gripping members with the nail land therebetween, and means for applying an axial force to the members in the axial direction of convergency of the gripping members to remove the gripped nail and members from the skeletal member cavity.
Claim 8
Dependent Claim
150 words
An extractor for removing from a skeletal member cavity an intramedullary nail having a portion of generally cruciform cross section comprising, in combination, a pair of annular telescopic and rotatable members, each including a plurality of generally axially extending fingers at one end thereof arranged in respective annularly spaced pairs, each respective pair of fingers being adapted to axially receive a land of the nail therebetween, an axially extending gripping member on each finger, the gripping member on respective pairs extending axially and circumferentially convergent to each other, means for rotating the members relative to each other to move the fingers of each respective pair toward each other and engage the gripping members with the nail land therebetween, and means for applying an axial force to the members in the axial direction of convergency of the gripping members to remove the gripped nail and members from the skeletal member cavity.
References Cited (Backward Citations)
US2579438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |