US 7,608,076 B2Granted

Minimally invasive collapsible surgical reamer

AssigneeGreatbatch Medical S.A.

InventorMahmoud Ezzedine

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Abstract

A surgical reamer (10) for cutting a bone socket is provided, defining a drive axis, an apex. The reamer (10) further includes (a) a fixed support portion (12) aligned with the drive axis and having at least one radial cutting blade (16c); (b) a pivoting portion (20) aligned with the drive axis and pivotable about this axis, the pivoting portion supporting at least one radial cutting blade (20c); and (c) a pivoting joint (22) wherein the pivoting portion may be pivoted toward and away from the fixed portion (12) so as to expand or contract the reamer in relative overall size and wherein the reamer has a cutting orientation in which the cutting blades (16c, 20c) are supported against relative rotational movement when cutting bone. A surgical kit and method employing the inventive reamer are also disclosed.

Claims22

Dependent claims

A surgical reamer for cutting a bone socket, comprising:

a) a drive shaft comprising a distal drive shaft portion extending along a drive axis to a proximal drive interface connectable to a rotary drive mechanism;
b) at least one fixed blade member comprising a proximal fixed blade portion secured to the drive shaft and extending in at least one radial direction to a distal fixed blade portion, wherein at least one fixed cutting blade extends upwardly from the distal portion of the fixed blade member;
c) a support shaft comprising a proximal support shaft portion secured to the proximal portion of the fixed blade member and extending to a distal support shaft portion;
d) at least one pin secured to the fixed blade member, the pin having a pin axis spaced from, but parallel to the drive axis;
e) at least one pivotable blade member comprising a proximal pivotable blade portion having an opening pivotably supported on the support shaft and extending in at least one radial direction to a distal pivotable blade portion, wherein at least one pivotable cutting blade extends upwardly from the distal portion of the pivotable blade member;
f) at least one circumferential slot provided in the pivotable blade member with the fixed pin received in the slot;
g) a biasing member biasing between the pivotable blade member and the distal portion of the support shaft to thereby maintain a selected pivoted relationship between the pivotable blade member and the fixed blade member;
and
h) wherein the pivotable blade member is selectively pivotable toward and away from the fixed blade member to either expand or contract the reamer in relative overall size, such that:
i) when the reamer is in a fully contracted configuration, the fixed cutting blade and the pivotable cutting blade are in a closely spaced relationship with the fixed pin abutting one end of the circumferential slot in the pivotable blade member;
and
ii) when the reamer is in a fully expanded configuration, the fixed cutting blade and the pivotable cutting blade are in a spaced apart relationship with the fixed pin abutting an opposite end of the circumferential slot to thereby block further spaced apart rotational movement of the at least one fixed cutting blade relative to the at least one pivotable cutting blade when cutting bone.

9 more elements

A surgical kit for cutting a bone socket, the surgical kit comprising a plurality of reamers having an array of sizes corresponding to the needs of individual patients, each reamer comprising:

a) a drive shaft comprising a distal drive shaft portion extending along a drive axis to a proximal drive interface connectable to a rotary drive mechanism;
b) at least one fixed blade member comprising a proximal fixed blade portion secured to the drive shaft and extending in at least one radial direction to a distal fixed blade portion, wherein at least one fixed cutting blade extends upwardly from the distal portion of the fixed blade member;
c) a support shaft comprising a proximal support shaft portion secured to the proximal portion of the fixed blade support member and extending to a distal support shaft portion;
d) at least one pin secured to the fixed blade member, the pin having a pin axis spaced from, but parallel to the drive axis;
e) at least one pivotable blade member comprising a proximal pivotable blade portion having an opening pivotably supported on the support shaft and extending in at least one radial direction to a distal pivotable blade portion, wherein at least one pivotable cutting blade extends upwardly from the distal portion of the pivotable blade member;
f) at least one circumferential slot provided in the pivotable blade member with the fixed pin received in the slot;
g) a biasing member biasing between the pivotable blade member and the distal portion of the support shaft to thereby maintain a selected pivoted relationship between the pivotable blade member and the fixed blade member;
and
h) wherein the pivotable blade member is selectively pivotable toward and away from the fixed blade member to either expand or contract the reamer in relative overall size, such that:
i) when the reamer is in a fully contracted configuration, the fixed cutting blade and the pivotable cutting blade are in a closely spaced relationship with the fixed pin abutting one end of the circumferential slot in the pivotable blade member;
and
ii) when the reamer is in a fully expanded configuration, the fixed cutting blade and the pivotable cutting blade are in a spaced apart relationship with the fixed pin abutting an opposite end of the circumferential slot to thereby block further spaced apart rotational movement of the at least one fixed cutting blade relative to the at least one pivotable cutting blade when cutting bone;
i) a holder for grasping the drive interface of one of the reamers, the holder including a quick-disconnect coupling for engaging and disengaging the reamer with a source of rotary power;
and
j) a case for conveniently storing the reamers and the holder.

12 more elements

A surgical reamer for cutting a bone socket, comprising:

a) a drive shaft comprising a distal drive shaft portion extending along a drive axis to a proximal drive interface connectable to a rotary drive mechanism;
b) at least one fixed blade member comprising a proximal fixed blade portion secured to the drive shaft and extending in at least one radial direction to a distal fixed blade portion, wherein at least one fixed cutting blade extends upwardly from the distal portion of the fixed blade member;
c) a support shaft comprising a proximal support shaft portion secured to the proximal portion of the fixed blade member and extending to a distal support shaft portion;
d) at least one pin secured to the fixed blade support member, the pin having a pin axis spaced from, but parallel to the drive axis;
e) at least one pivotable blade member comprising a proximal pivotable blade portion having an opening pivotably supported on the support shaft and extending in at least one radial direction to a distal pivotable blade portion, wherein at least one pivotable cutting blade extends upwardly from the distal portion of the pivotable blade member;
f) at least one circumferential slot provided in the pivotable blade member with the fixed pin received in the slot;
g) a biasing member biasing between the pivotable blade member and the distal portion of the support shaft to thereby maintain a selected pivoted relationship between the pivotable blade member and the fixed blade member;
and
h) wherein the pivotable blade member is rotatable toward the fixed blade member to provide the reamer in a fully contracted configuration with the fixed cutting blade and the pivotable cutting blade being in a closely spaced relationship having the fixed pin abutting one end of the circumferential slot in the pivotable blade member;
and
i) wherein the pivotable blade member is rotatable against tissue to thereby create friction which acts to open the reamer from the fully contracted position to the fully expanded configuration with the fixed cutting blade and the pivotable cutting blade being in a spaced apart relationship having the fixed pin abutting an opposite end of the circumferential slot to thereby block further spaced apart rotational movement of the at least one fixed cutting blade relative to the at least one pivotable cutting blade when cutting bone.

8 more elements

A surgical reamer for cutting a bone socket, comprising:

a) a drive shaft means extending along a drive axis from a distal drive shaft portion to a proximal drive interface connectable to a rotary drive mechanism;
b) at least one fixed blade member comprising a proximal fixed blade portion secured to the drive shaft means and extending in a radial direction to a distal fixed blade portion, wherein at least one fixed cutting blade extends upwardly from the distal portion of the fixed blade member;
c) at least one pin secured to the fixed blade member, the pin having a pin axis spaced from, but parallel to the drive axis;
d) at least one pivotable blade member comprising a proximal pivotable blade portion having an opening pivotably supported on the drive shaft means and extending in a radial direction to a distal pivotable blade portion, wherein at least one pivotable cutting blade extends upwardly from the distal portion of the pivotable blade member;
e) at least one circumferential slot provided in the pivotable blade member with the fixed pin received in the slot;
f) a biasing member biasing between the pivotable blade member and the distal portion of the drive shaft means to thereby maintain a selected pivoted relationship between the pivotable blade member and the fixed blade member;
and
g) wherein the pivotable blade member is selectively pivotable toward or away from the fixed blade member to either expand and contract the reamer in relative overall size, such that:
i) when the reamer is in a fully contracted configuration, the fixed cutting blade and the pivotable cutting blade are in a closely spaced relationship with the fixed pin abutting one end of the circumferential slot in the pivotable blade member;
and
ii) when the reamer is in a fully expanded configuration, the fixed cutting blade and the pivotable cutting blade are in a spaced apart relationship with the fixed pin abutting an opposite end of the circumferential slot to thereby block further spaced apart rotational movement of the at least one fixed cutting blade relative to the at least one pivotable cutting blade when cutting bone.

8 more elements

A surgical reamer for cutting a bone socket, comprising:

a) a drive shaft comprising a distal drive shaft portion extending along a drive axis to a proximal drive interface connectable to a rotary drive mechanism;
b) a fixed blade member comprising opposed portions extending radially from a proximal fixed blade portion secured to the drive shaft to respective distal portions of the fixed blade member, wherein at least one fixed cutting blade extends upwardly from the distal portions of each of the fixed blade portions;
c) a support shaft comprising a proximal support shaft portion secured to the proximal fixed blade portion and extending to a distal support shaft portion;
d) at least one fixed pin secured to the fixed blade member, the pin having a pin axis spaced from, but parallel to the drive axis;
e) a pivotable blade member comprising a proximal pivotable blade portion having an opening pivotably supported on the support shaft and extending in opposed radial directions to two distal pivotable blade portions, wherein at least one pivotable cutting blade extends upwardly from each of the distal pivotable portions;
f) at least one circumferential slot provided in the pivotable blade member with the fixed pin received in the slot;
g) a biasing member biasing between the pivotable blade member and the distal portion of the support shaft to thereby maintain a selected pivoted relationship between the pivotable blade member and the fixed blade member;
and
h) wherein the pivotable blade member is selectively pivotable toward and away from the fixed blade member to either expand or contract the reamer in relative overall size, such that:
i) when the reamer is in a fully contracted configuration, the fixed cutting blades and the pivotable cutting blades are in a closely spaced relationship with the fixed pin abutting one end of the circumferential slot in the pivotable blade member;
and
ii) when the reamer is in a fully expanded configuration, the fixed cutting blades and the pivotable cutting blades are in a spaced apart relationship with the fixed pin abutting an opposite end of the circumferential slot to thereby block further spaced apart rotational movement of the fixed cutting blades relative to the pivotable cutting blades when cutting bone.

9 more elements

A surgical method for cutting a bone socket in a patient, comprising the steps of:

a) providing a reamer, which comprises:
a drive shaft comprising a distal drive shaft portion extending along a drive axis to a proximal drive interface connectable to a rotary drive mechanism;
at least one fixed blade member comprising a proximal fixed blade portion secured to the drive shaft and extending in at least one radial direction to a distal fixed blade portion, wherein at least one fixed cutting blade extends upwardly from the distal portion of the fixed blade member;
a support shaft comprising a proximal support shaft portion secured to the proximal portion of the fixed blade member and extending to a distal support shaft portion;
at least one pin secured to the fixed blade member, the pin having a pin axis spaced from, but parallel to the drive axis;
at least one pivotable blade member comprising a proximal pivotable blade portion having an opening pivotably supported on the support shaft and extending in at least one radial direction to a distal pivotable blade portion, wherein at least one pivotable cutting blade extends upwardly from the distal portion of the pivotable blade member;
at least one circumferential slot provided in the pivotable blade member with the fixed pin received in the slot;
a biasing member biasing between the pivotable blade member and the distal portion of the support shaft to thereby maintain a selected pivoted relationship between the pivotable blade member and the fixed blade member;
and wherein the pivotable blade member is selectively pivotable toward and away from the fixed blade member to either expand or contract the reamer in relative overall size, such that:
i) when the reamer is in a fully contracted configuration, the fixed cutting blade and the pivotable cutting blade are in a closely spaced relationship with the fixed pin abutting one end of the circumferential slot in the pivotable blade member;
and
ii) when the reamer is in a fully expanded configuration, the fixed cutting blade and the pivotable cutting blade are in a spaced apart relationship with the fixed pin abutting an opposite end of the circumferential slot to thereby block further spaced apart rotational movement of the at least one fixed cutting blade relative to the at least one pivotable cutting blade when cutting bone;
b) providing a holder coupled to a source of rotary power;
c) releasably connecting the drive interface of the reamer to the holder;
d) collapsing the reamer into the fully contracted configuration having a less invasive insertion profile and passing the reamer through a surgical incision thence to the bone socket in the appropriate position for cutting;
e) powering the reamer in the bone socket to expand the reamer into the fully expanded configuration and then reaming the bone socket as required;
f) turning the reamer in a direction opposite to the cutting direction, thus causing the pivotable blade member and the fixed blade member to move into the fully contracted configuration having a smaller, less invasive insertion profile;
and
g) removing the reamer, with its collected debris, back through the incision.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/380,006Filed 25 Apr 2006 · us provisional application
Priority: 29 Apr 2005
Published: US 2006/0264958 A123 Nov 2006
Granted: 27 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

A61B 17/1666
For the hip: for the acetabulum
A61B 17/1617
Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material: with mobile or detachable parts
A61B
Medical diagnosis and surgery

Family

Application60/675,925Us provisional application · filed 29 Apr 2005
US 2006/0264958 A1Pre-grant publication · published 23 Nov 2006
US 7,608,076 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

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