U.S. patent application number 14/492805 was filed with the patent office on 2015-06-04 for rotational atherectomy device with exchangeable drive shaft and meshing gears.
The applicant listed for this patent is Cardiovascular Systems, Inc.. Invention is credited to Nicholas W. Rydberg.
Application Number | 20150150588 14/492805 |
Document ID | / |
Family ID | 52393865 |
Filed Date | 2015-06-04 |
United States Patent
Application |
20150150588 |
Kind Code |
A1 |
Rydberg; Nicholas W. |
June 4, 2015 |
ROTATIONAL ATHERECTOMY DEVICE WITH EXCHANGEABLE DRIVE SHAFT AND
MESHING GEARS
Abstract
An atherectomy device with an exchangeable drive shaft is
disclosed, having a drive shaft gear at a distal end of the
exchangeable drive shaft for meshing engagement with a prime mover
gear on the output shaft of the prime mover. The exchangeable drive
shaft is inserted into an opening at the distal end of the handle
housing and moved axially in a proximal direction. Surface features
on at least the prime mover housing and the engageable drive shaft
help to align the drive shaft gear with the prime mover gear for
meshing engagement.
Inventors: |
Rydberg; Nicholas W.;
(Oakdale, MN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Cardiovascular Systems, Inc. |
St. Paul |
MN |
US |
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|
Family ID: |
52393865 |
Appl. No.: |
14/492805 |
Filed: |
September 22, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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14340353 |
Jul 24, 2014 |
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14492805 |
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61950402 |
Mar 10, 2014 |
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61858345 |
Jul 25, 2013 |
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Current U.S.
Class: |
606/159 |
Current CPC
Class: |
A61B 2017/0046 20130101;
A61B 2017/00991 20130101; A61B 2017/00526 20130101; Y10T 29/4984
20150115; A61B 2017/00398 20130101; A61B 2017/00477 20130101; A61B
17/320758 20130101; A61B 90/98 20160201; A61B 2017/00473
20130101 |
International
Class: |
A61B 17/3207 20060101
A61B017/3207 |
Claims
1. A device, comprising: a handle, comprising: a proximal section;
a distal section comprising a channel extending proximally from an
opening in a distal end of the handle; and an elongated
intermediate section comprising a trough extending between the
proximal and the distal sections; a prime mover carriage comprising
a prime mover, the prime mover carriage disposed within the trough
of the intermediate section; a prime mover gear fixedly attached to
a shaft of the prime mover; an exchangeable drive shaft cartridge,
comprising: a proximal section and a distal section; a slot in an
intermediate section extending between the proximal and the distal
sections; a drive shaft comprising a proximal end and a distal end,
the drive shaft extending through an opening in the distal section
of the drive shaft cartridge; a gear engagement assembly comprising
a drive shaft gear fixedly attached to the proximal end of the
drive shaft; and a control knob having at least a portion thereof
extending through the slot and operationally coupled to the gear
engagement assembly such that a longitudinal displacement of the
control knob induces a longitudinal displacement of the gear
engagement assembly, the control knob comprising: an unlocked state
for permitting the longitudinal displacement of the control knob;
and a locked state for inhibiting the longitudinal displacement of
the control knob; and one or more connectors for removably
connecting the handle and the drive shaft cartridge to one another,
wherein each of the one or more connectors comprises complementary
first and second sections, wherein the first section is integrally
formed with the handle; and the second section is integrally formed
with the drive shaft cartridge; wherein, the handle and the drive
shaft cartridge are removably connected by: removably meshing the
prime mover gear and the drive shaft gear by juxtaposing the prime
mover carriage and the gear engagement assembly; and concurrently
displacing the handle and the drive shaft cartridge in opposite
directions.
2. The device of claim 1, wherein the one or more connectors are
selected from the group consisting of snap-fit connectors, tongue
and groove connectors, rails, bayonet mount, and ribs.
3. The device of claim 1, wherein the channel in the distal section
of the handle and the opening in the distal end of the handle are
configured for passage therethrough of at least the drive
shaft.
4. The device of claim 1, wherein the proximal section of the
handle comprises one of a guide wire clamp and a guide wire brake
mechanism.
5. The device of claim 1, wherein the intermediate section of the
handle is configured for: longitudinal displacement of the prime
mover carriage disposed within the trough thereof; longitudinal
displacement of the gear engagement assembly; and longitudinal
displacement of at least a portion of the drive shaft.
6. The device of claim 1, wherein the gear engagement assembly is
disposed within a trough in the intermediate section of the drive
shaft cartridge, the trough configured for longitudinal
displacement of the gear engagement assembly.
7. The device of claim 6, wherein the intermediate sections of the
handle and the drive shaft cartridge form an elongated hollow
intermediate section of the device when the handle and the drive
shaft cartridge are removably connected.
8. The device of claim 1, wherein the longitudinal displacement of
the gear engagement assembly induces a longitudinal displacement of
the prime mover carriage and of the drive shaft extending from the
gear engagement assembly when the handle and the drive shaft
cartridge are removably connected.
9. The device of claim 1, wherein at least a portion of the drive
shaft is telescoping.
10. The device of claim 1, wherein the prime mover is selected from
the group consisting of a turbine and an electric motor.
11. The device of claim 1, comprising one or more sensors for
monitoring a rotational speed of at least one of the prime mover
shaft and the drive shaft.
12. The device of claim 1, comprising at least one alignment
element configured for aligning at least the prime mover carriage
and the gear engagement assembly with one another, the at least one
alignment element comprising complementary first and second
sections, wherein the first section is integrally formed with the
prime mover carriage; and the second section is integrally formed
with the gear engagement assembly.
13. The device of claim 12, wherein the at least one alignment
element is further configured as a connector for removably
connecting at least the prime mover carriage and the gear
engagement assembly to one another.
14. The device of claim 12, wherein the at least one alignment
element is configured for aligning at least the prime mover gear
and the drive shaft gear with one another.
15. The device of claim 1, comprising at least one alignment
element configured for aligning at least the handle and the drive
shaft cartridge with one another, the at least one alignment
element comprising complementary first and second sections, wherein
the first section is integrally formed with the handle; and the
second section is integrally formed with the drive shaft
cartridge.
16. The device of claim 1, comprising: a lumen having the drive
shaft disposed therewithin; a fluid infusion port in fluid
communication with the lumen; and a fluid reservoir in fluid
communication with the fluid infusion port; wherein, the fluid
infusion port is configured for delivering fluid from the fluid
reservoir to the lumen.
17. The device of claim 1, wherein the distal end of the drive
shaft is configured for insertion into a vasculature.
18. The device of claim 17, comprising an abrasive element
proximate the distal end of the drive shaft.
19. The device of claim 1, comprising at least one disconnect
mechanism for disconnecting the removably connected handle and the
drive shaft cartridge.
20. The device of claim 19, wherein a different drive shaft
cartridge is removably connected with the handle.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional of U.S. patent application
Ser. No. 14/340,353 filed Jul. 24, 2014 which claims the benefit of
U.S. Provisional Application No. 61/950,402, filed Mar. 10, 2014,
and the benefit of U.S. Provisional Application No. 61/858,345
filed Jul. 25, 2013, the entirety of which prior filed applications
are hereby incorporated by reference.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] Not Applicable
BACKGROUND OF THE INVENTION
[0003] 1. Field of the Invention
[0004] The disclosure relates to devices and methods for removing
tissue from body passageways, such as removal of atherosclerotic
plaque from arteries, utilizing a rotational atherectomy device. In
particular, the disclosure relates to improvements in a rotational
atherectomy device having an exchangeable drive shaft.
[0005] 2. Description of the Related Art
[0006] A variety of techniques and instruments have been developed
for use in the removal or repair of tissue in arteries and similar
body passageways. A frequent objective of such techniques and
instruments is the removal of atherosclerotic plaque in a patient's
arteries. Atherosclerosis is characterized by the buildup of fatty
deposits (atheromas) in the intimal layer (i.e., under the
endothelium) of a patient's blood vessels. Very often over time
what initially is deposited as relatively soft, cholesterol-rich
atheromatous material hardens into a calcified atherosclerotic
plaque. Such atheromas restrict the flow of blood, and therefore
often are referred to as stenotic lesions or stenoses, the blocking
material being referred to as stenotic material. If left untreated,
such stenoses can cause angina, hypertension, myocardial
infarction, strokes and the like.
[0007] Several kinds of atherectomy devices have been developed for
attempting to remove some or all of such stenotic material. In one
type of device, such as that shown in U.S. Pat. No. 4,990,134
(Auth), a rotating burr covered with an abrasive cutting material,
such as diamond grit (diamond particles or dust), is carried at the
distal end of a flexible, rotatable drive shaft.
[0008] U.S. Pat. No. 5,314,438 (Shturman) shows another atherectomy
device having a rotatable drive shaft with a section of the drive
shaft having an enlarged diameter, at least a segment of this
enlarged diameter section being covered with an abrasive material
to define an abrasive segment of the drive shaft. When rotated at
high speeds, the abrasive segment is capable of removing stenotic
tissue from an artery.
[0009] U.S. Pat. No. 5,314,407 (Auth) shows details of a type of
handle which may be used in conjunction with rotational atherectomy
devices of the type shown in the Auth '134 and Shturman '438
patents. A handle of the type shown in the Auth '407 patent has
been commercialized by Heart Technology, Inc. (Redmond, Wash.), now
owned by Boston Scientific Corporation (Natick, Mass.) in the
rotational atherectomy device sold under the trademark
Rotablator.RTM.. The handle of the Rotablator.RTM. device includes
a variety of components, including a compressed gas driven turbine,
a mechanism for clamping a guide wire extending through the drive
shaft, portions of a fiber optic tachometer, and a pump for pumping
saline through the drive shaft.
[0010] The connection between the drive shaft (with its associated
burr) and the turbine in the Rotablator.RTM. device is permanent;
yet, frequently it is necessary to use more than one size burr
during an atherectomy procedure. That is, often a smaller size burr
is first used to open a stenosis to a certain diameter, and then
one or more larger size burrs are used to open the stenosis
further. Such use of multiple burrs of subsequently larger diameter
is sometimes referred to as a "step up technique" and is
recommended by the manufacturer of the Rotablator.RTM. device. In
the multiple burr technique it is necessary to use a new
Rotablator.RTM. device for each such successive size burr.
Accordingly, there is a need for an atherectomy system that would
permit a physician to use only one handle throughout an entire
procedure and to attach to such handle an appropriate drive shaft
and tissue removing implement (e.g., a burr) to initiate the
procedure and then exchange the drive shaft and the tissue removing
implement for a drive shaft having a tissue removing implement of a
different size or even a different design.
[0011] A subsequent version of the Rotablator.RTM. has been
introduced with the ability to exchange a flexible distal portion
of the drive shaft together with a burr for another distal portion
of a drive shaft having a different size burr. Technical details of
such a system are contained in U.S. Pat. No. 5,766,190, titled
"Connectable driveshaft system", and issued on Jun. 16, 1998 to
Wulfman. This system utilizes a flexible drive shaft having a
connect/disconnect feature allowing the physician to disconnect the
exchangeable distal portion of the flexible drive shaft together
with the burr from the flexible proximal portion of the drive shaft
which is connected to the turbine of the handle, thus permitting
the burr size to be changed without discarding the entire
atherectomy unit. Each exchangeable drive shaft portion is disposed
within its own exchangeable catheter and catheter housing. The
flexible proximal portion of the drive shaft in this system is
permanently attached to the turbine and is not exchanged. This
system has been commercialized by Boston Scientific under the
trademark Rotalink System.RTM.. While the Rotalink System.RTM. does
permit one to change the burr size, the steps required to actually
disconnect the exchangeable portion of the drive shaft and replace
it with another exchangeable portion of the drive shaft are quite
involved and require relatively intricate manipulation of very
small components.
[0012] First, a catheter housing must be disconnected from the
handle and moved distally away from the handle to expose portions
of both the proximal and distal sections of the flexible drive
shaft which contain a disconnectable coupling. This coupling is
disconnected by sliding a lock tube distally, permitting
complementary lock teeth on the proximal and distal portions of the
flexible drive shaft to be disengaged from each other. A similar
flexible distal drive shaft portion with a different burr may then
be connected to the flexible proximal portion of the drive shaft.
To accomplish such assembly, the lock tooth on the proximal end of
the distal replacement portion of the drive shaft must first be
both longitudinally and rotationally aligned with the complementary
lock tooth at the distal end of the proximal portion of the drive
shaft. Since the flexible drive shaft typically is less than 1 mm
in diameter, the lock teeth are similarly quite small in size,
requiring not insignificant manual dexterity and visual acuity to
properly align and interlock the lock teeth. Once the lock teeth
have been properly interlocked with each other, the lock tube (also
having a very small diameter) is slid proximally to secure the
coupling. The catheter housing must then be connected to the handle
housing.
[0013] While this system does permit one to exchange one size burr
(together with a portion of the drive shaft) for a burr of another
size, the exchange procedure is not an easy one and must be
performed with considerable care. The individual performing the
exchange procedure must do so while wearing surgical gloves to
protect the individual from the blood of the patient and to
maintain the sterility of the elements of the system. Surgical
gloves diminish the tactile sensations of the individual performing
the exchange procedure and therefore make such exchange procedure
even more difficult.
[0014] In recent years, there has been an effort to develop an
atherectomy device with easier attachment and/or exchange of the
drive shaft and its tissue removing implement.
[0015] For instance, U.S. Pat. No. 6,024,749 (Shturman et al), U.S.
Pat. No. 6,077,282 (Shturman et al), U.S. Pat. No. 6,129,734
(Shturman et al) and U.S. Pat. No. 6,852,118 (Shturman et al), all
incorporated by reference in their entirety herein, disclose an
atherectomy device having an exchangeable drive shaft cartridge
comprising a housing that is removably attachable to the device's
handle housing. The exchangeable cartridge includes a
longitudinally movable tube that is removably attached to the prime
mover carriage and a rotatable drive shaft that is removably
attachable to the prime mover. A coupling is provided which
connects the longitudinally extendible tube to the prime mover
while indexing the relative position of the longitudinally
extendible tube and the proximal portion of the drive shaft. U.S.
Patent Publication No. 2011/0087254 (Welty), incorporated by
reference in its entirety herein, discloses an atherectomy device
where the prime mover has a prime mover coupler and the drive shaft
has a drive shaft coupler that is engageable with the prime mover
coupler. The drive shaft coupler and prime mover coupler have
engageable lateral cross-sections that are complementary and
geometrically keyed to one another. When they are engaged to one
another, the complementary cross-sections allow axial translation
between the drive shaft coupler and the prime mover coupler while
prohibiting rotational coupler between the drive shaft coupler and
the prime mover coupler.
[0016] Other atherectomy devices, such as U.S. Patent Pub. No.
2011/0077673 (Grubac et al), utilize a magnetic clutch connection
between the drive shaft and the prime mover. The drive shaft and
the prime mover are held together longitudinally by a magnetic
attractive force between the motor plate and the drive shaft plate.
The torques between the motor and the drive shaft are transmitted
completely between the motor plate and the drive shaft plate and,
when below a threshold torque, the motor plate and the drive shaft
plate remain held together rotationally by static friction. When
the torques between the motor and the drive shaft are greater than
the threshold torque, the motor plate and the drive shaft plate
slip rotationally past each other, causing a residual torque to be
transmitted between the motor and the drive shaft.
[0017] Although the above devices utilize friction or magnetic
couplings to removably engage the drive shaft with the prime mover,
some atherectomy devices have a driveshaft driven by a pair of
mating gears, one gear connected to the drive shaft and one gear
connected to the mating gear. Due to this gearing arrangement, the
atherectomy device is generally restricted to one shaft size per
assembly. Typically the gear connected to the drive shaft is not
replaced, so any exchangeable drive shaft must be sized to properly
engage with the drive shaft. Thus, multiple atherectomy devices are
needed for each desired drive shaft diameter.
[0018] Accordingly, there exists a need for an atherectomy device
with the mating gear assembly where the drive shaft is exchangeable
for another drive shaft of either the same size or another
size.
BRIEF SUMMARY OF THE INVENTION
[0019] An embodiment of a rotational atherectomy device includes a
handle having a proximal section, a distal section having a channel
extending proximally from an opening in a distal end of the handle,
and an elongated hollow intermediate section between the proximal
and the distal sections. The intermediate section includes an
opening between an interior thereof and the channel in the distal
section, and a slot. The device further includes a prime mover
carriage having a prime mover, and a prime mover gear fixedly
attached to a shaft of the prime mover. The prime mover carriage is
disposed within the interior of the intermediate section. The
device further includes a control knob having at least a portion
thereof extending through the slot in the intermediate section and
operationally coupled to the prime mover carriage such that a
longitudinal displacement of the control knob induces a
longitudinal displacement of the prime mover carriage. The control
knob is operable to an unlocked state for permitting the
longitudinal displacement of the control knob, and to a locked
state for inhibiting the longitudinal displacement of the control
knob. Some embodiments of the device include an exchangeable drive
shaft cartridge having a proximal section and a distal section, and
a drive shaft having a proximal end and a distal end. The drive
shaft extends through an opening in the distal section of the drive
shaft cartridge. The drive shaft cartridge includes a gear
engagement assembly having a drive shaft gear fixedly attached to
the proximal end of the drive shaft. Some embodiments of the device
include one or more connectors for removably connecting the distal
section of the handle and the distal section of the drive shaft
cartridge to one another. Certain embodiments of the one or more
connectors includes complementary first and second sections,
wherein the first section of each connector is integrally formed
with the distal section of handle, and the complementary second
section of each connector is integrally formed with the distal
section of the drive shaft cartridge. The device includes at least
one alignment element on at least one of the gear engagement
assembly, the prime mover carriage and the interior of the
intermediate section of the handle. The at least one alignment
element is configured for aligning at least the prime mover gear
and the drive shaft gear with one another when the gear engagement
assembly is extended into the interior of the intermediate section
and positioned proximate the prime mover. The device further
includes at least one biasing element configured for removably
meshing the prime mover gear and the drive shaft gear when the
prime mover gear and the drive shaft gear are aligned with one
another such that a rotational movement of one of the prime mover
and the drive shaft induces a rotational movement in the other.
[0020] Another embodiment of a rotational atherectomy device
includes a handle having a proximal section, a distal section
having a channel extending proximally from an opening in a distal
end of the handle, and an elongated intermediate section having a
trough extending between the proximal and the distal sections. The
device further includes a prime mover carriage having a prime
mover, and a prime mover gear fixedly attached to a shaft of the
prime mover. The prime mover carriage disposed within the trough of
the intermediate section. Some embodiments of the device include an
exchangeable drive shaft cartridge having a proximal section and a
distal section, a slot in an inter mediate section extending
between the proximal and the distal sections, a drive shaft having
a proximal end and a distal end. The drive shaft extends through an
opening in the distal section of the drive shaft cartridge. The
drive shaft cartridge includes a gear engagement assembly having a
drive shaft gear fixedly attached to the proximal end of the drive
shaft, and a control knob having at least a portion thereof
extending through the slot and operationally coupled to the drive
shaft cartridge such that a longitudinal displacement of the
control knob induces a longitudinal displacement of the drive shaft
cartridge. The control knob can be operated to an unlocked state
for permitting the longitudinal displacement of the control knob,
and to a locked state for inhibiting the longitudinal displacement
of the control knob. Certain embodiments of the device include one
or more connectors for removably connecting the handle and the
drive shaft cartridge to one another. Some embodiments of the one
or more connectors include complementary first and second sections,
wherein the first section is integrally formed with the handle, and
the complementary second section is integrally formed with the
drive shaft cartridge. The handle and the drive shaft cartridge are
removably connected by removably meshing the prime mover gear and
the drive shaft gear by juxtaposing the prime mover carriage and
the gear engagement assembly, and concurrently displacing the
handle and the drive shaft cartridge in opposite directions.
[0021] Yet another embodiment of a rotational atherectomy device
includes a handle having a proximal section, a distal section
having a trough, and an elongated hollow intermediate section
between the proximal and the distal sections. The intermediate
section includes an opening between an interior thereof and the
trough, and a slot. The device further includes a prime mover
carriage having a prime mover and a prime mover gear fixedly
attached to a shaft of the prime mover. In some embodiments, the
prime mover carriage is disposed within the interior of the
intermediate section. Some embodiments of the device include a
control knob having at least a portion thereof extending through
the slot and operationally coupled to the prime mover carriage such
that a longitudinal displacement of the control knob induces a
longitudinal displacement of the prime mover carriage. The control
knob can be operated to an unlocked state for permitting the
longitudinal displacement of the control knob, and to a locked
state for inhibiting the longitudinal displacement of the control
knob. The device further includes an exchangeable drive shaft
cartridge having a proximal section and a distal section, and a
drive shaft having a proximal end and a distal end. The drive shaft
extends through an opening in the distal section of the drive shaft
cartridge. The drive shaft cartridge includes a gear engagement
assembly having a drive shaft gear fixedly attached to the proximal
end of the drive shaft, and one or more connectors for removably
connecting the handle and the drive shaft cartridge to one another,
wherein each of the one or more connectors includes complementary
first and second sections, wherein the first section is integrally
formed with the handle and the complementary second section is
integrally formed with the drive shaft cartridge. The handle and
the drive shaft cartridge are removably connected by inserting at
least the gear engagement assembly through the opening in the
intermediate section of the handle, removably meshing the prime
mover gear and the drive shaft gear by juxtaposing the prime mover
carriage and the gear engagement assembly, and displacing the
handle and the drive shaft cartridge in opposite directions.
[0022] Another embodiment of a rotational atherectomy device
includes a handle having a proximal section, a distal section, and
an elongated hollow intermediate section between the proximal and
the distal sections. The intermediate section includes a door for
accessing an interior thereof, an opening between the interior and
the distal section, and a slot. The device further includes a prime
mover carriage having a prime mover, and a prime mover gear fixedly
attached to a shaft of the prime mover. In certain embodiments, the
prime mover carriage is disposed within the interior of the
intermediate section. Some embodiments of the device include a
control knob having at least a portion thereof extending through
the slot and operationally coupled to the prime mover carriage such
that a longitudinal displacement of the control knob induces a
longitudinal displacement of the prime mover carriage. Certain
embodiments of the control knob can be operated to an unlocked
state for permitting the longitudinal displacement of the control
knob, and to a locked state for inhibiting the longitudinal
displacement of the control knob. The device further includes an
exchangeable drive shaft cartridge having a drive shaft extending
between a proximal end and a distal end, and through an opening in
a distal section of the drive shaft cartridge. The drive shaft
cartridge includes a gear engagement assembly having a drive shaft
gear fixedly attached to the proximal end of the drive shaft.
Certain embodiments of the device include a first connector for
removably and pivotally connecting the prime mover carriage and the
gear engagement assembly to one another and for aligning at least
the prime mover gear and the drive shaft gear with one another.
Some embodiments of the first connector include complementary first
and second sections, wherein the first section is integrally formed
with the prime mover carriage, and the second section is integrally
formed with the gear engagement assembly. The device further
includes a second connector for removably connecting the handle and
the drive shaft cartridge to one another, wherein removably
connecting the handle and the drive shaft cartridge using the
second connector removably meshes the prime mover gear and the
drive shaft gear, such that a rotational movement of one of the
prime mover and the drive shaft induces a rotational movement in
the other.
[0023] Yet another embodiment of a rotational atherectomy device
includes a handle having a proximal section, a distal section
having a channel extending proximally from an opening in a distal
end of the handle, and an elongated hollow intermediate section
between the proximal and the distal sections. The intermediate
section includes an opening between an interior thereof and the
channel in the distal section, and a slot. Embodiments of the
device include a prime mover carriage having a prime mover, and a
prime mover gear fixedly attached to a shaft of the prime mover. In
certain embodiments, the prime mover carriage is disposed within
the interior of the intermediate section. Some embodiments of the
device include a control knob having at least a portion thereof
extending through the slot and operationally coupled to the prime
mover carriage such that a longitudinal displacement of the control
knob induces a longitudinal displacement of the prime mover
carriage. In certain embodiments, the control knob can be operated
to an unlocked state for permitting the longitudinal displacement
of the control knob, and to a locked state for inhibiting the
longitudinal displacement of the control knob. Embodiments of the
device further include an exchangeable drive shaft cartridge having
a proximal section and a distal section, a drive shaft extending
between a proximal end and a distal end. The drive shaft extends
through an opening in the distal section of the drive shaft
cartridge. The drive shaft cartridge includes a gear engagement
assembly having a drive shaft gear fixedly attached to the proximal
end of the drive shaft. Some embodiments of the device include a
first connector for removably and pivotally connecting the handle
and the drive shaft cartridge to one another, and a second
connector for removably connecting the handle and the drive shaft
cartridge to one another.
[0024] In some embodiments of the device, the first connector is a
pivoting connector having complementary first and second sections,
wherein the first section is integrally formed with the distal
section of the handle, and the complementary second section is
integrally formed with the drive shaft cartridge. In certain
embodiments, the second connector includes complementary first and
second sections, wherein the first section is integrally formed
with the handle, and the second section is integrally formed with
the proximal section of the drive shaft cartridge. Removably
connecting the handle and the drive shaft cartridge using the
second connector removably meshes the prime mover gear and the
drive shaft gear, such that a rotational movement of one of the
prime mover and the drive shaft induces a rotational movement in
the other.
[0025] In certain embodiments of the device, the first connector is
a pivoting connector having complementary first and second
sections, wherein the first section is integrally formed with the
handle, and the second section is integrally formed with the
proximal section of the drive shaft cartridge. In some embodiments,
the second connector includes complementary first and second
sections, wherein the first section is integrally formed with the
distal section of the handle, and the second section is integrally
formed with the drive shaft cartridge. At least the prime mover
gear and the drive shaft gear are aligned with one another when the
handle and the drive shaft cartridge are removably and pivotally
connected using the first connector. Removably connecting the
handle and the drive shaft cartridge using the second connector
removably meshes the prime mover gear and the drive shaft gear,
such that a rotational movement of one of the prime mover and the
drive shaft induces a rotational movement in the other.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0026] FIG. 1A is a perspective view of an embodiment of a
rotational atherectomy device;
[0027] FIG. 1B illustrates the device of FIG. 1A in an unloaded
state;
[0028] FIG. 1C is a longitudinal cross-sectional view of the device
of FIG. 1A;
[0029] FIG. 1D is a perspective view of an embodiment of an
exchangeable drive shaft cartridge for the device of FIG. 1A;
[0030] FIG. 1 E is a perspective view of the drive shaft cartridge
of FIG. 1D illustrating a drive shaft in a telescoped state;
[0031] FIG. 1F is a longitudinal cross-sectional view of at least a
portion of a distal section of the drive shaft cartridge of FIG.
1D;
[0032] FIG. 2A is a detailed longitudinal cross-sectional view of
an embodiment of a prime mover carriage within the unloaded device
of FIG. 1B;
[0033] FIG. 2B is a detailed longitudinal cross-sectional view of
the prime mover carriage of FIG. 2A with the exchangeable drive
shaft cartridge of FIG. 1D attached thereto;
[0034] FIG. 2C is a detailed perspective view of a proximal section
of the exchangeable drive shaft cartridge of FIG. 1D;
[0035] FIG. 3A is a longitudinal cross-sectional view illustrating
embodiments of a prime mover carriage and a gear engagement
assembly in an un-meshed state;
[0036] FIG. 3B is a longitudinal cross-sectional view illustrating
the prime mover carriage and the gear engagement assembly of FIG.
3A in a un-meshed state;
[0037] FIG. 4A is a perspective view of a distal section in an
embodiment of an exchangeable drive shaft cartridge for another
embodiment of a rotational atherectomy device;
[0038] FIG. 4B is a cross-section view of a portion of the distal
section of FIG. 4A;
[0039] FIG. 4C is a perspective view of a handle configured for
removably connecting with the distal section of FIG. 4A;
[0040] FIG. 4D is a top view of a distal section of the handle of
FIG. 4C;
[0041] FIG. 5 is a perspective view of another embodiment of a
rotational atherectomy device in a dis-assembled state;
[0042] FIG. 6 is a perspective view of yet another embodiment of a
rotational atherectomy device in a dis-assembled state;
[0043] FIG. 7A is a perspective view of an embodiment of a
rotational atherectomy device;
[0044] FIG. 7B is a side view illustrating an embodiment of a
pivoting connector for a prime mover carriage and an exchangeable
drive shaft cartridge in the device of FIG. 7A;
[0045] FIG. 8 is a side view of another embodiment of a rotational
atherectomy device;
[0046] FIG. 9 is a side view of yet another embodiment of a
rotational atherectomy device; and
[0047] FIG. 10 is a block diagram representation of an embodiment
of a system for performing an atherectomy procedure.
DETAILED DESCRIPTION OF THE INVENTION
[0048] In the following detailed description of the various
embodiments illustrated in the appended figures, like components
and elements are identified using like reference numerals.
[0049] FIGS. 1A and 1B, respectively, are perspective views of an
embodiment of a rotational atherectomy device 100 in a "loaded" and
an "unloaded" state, and FIG. 1C is a longitudinal cross-sectional
view the device 100 in the "loaded" state. The device 100 includes
a handle 102 and an exchangeable drive shaft cartridge 104 that can
be removably connected to one another. The device 100 is considered
to be in the "loaded" state when the handle 102 and the drive shaft
cartridge 104 are connected to one another, and is considered to be
in the "unloaded" state when the handle 102 and the drive shaft
cartridge 104 are separated from one another. The drive shaft
cartridge 104 is referenced as "exchangeable" because the device
100 is configured for enabling an operator to use different drive
shaft cartridges with the same handle 102.
[0050] In some embodiments, the handle 102 includes a proximal
section 106, a distal section 108, and an elongated hollow
intermediate section 110 extending between the proximal and distal
sections 106 and 108, respectively. In some embodiments, the distal
section 108 includes a channel 112 extending proximally from an
opening 114 in a distal end 116 of the handle 102. The channel 112
and the opening 114 are configured for passage therethrough of at
least a portion of the drive shaft cartridge 104. The intermediate
section 110 includes an opening 118 between a longitudinally
extending interior 120 of the intermediate section 110 and the
channel 112 in the distal section 108. The opening 118 is also
configured for passage therethrough of at least a portion of the
drive shaft cartridge 104. The intermediate section 110 further
includes a longitudinally extending slot 122 extending into the
interior 120.
[0051] The interior 120 is configured for housing and for the
longitudinal displacement therewithin of a prime mover carriage
124. As further described elsewhere with reference to FIGS. 2A and
2B, the prime mover carriage 124 includes a prime mover 126 having
a prime mover gear 128 fixedly attached to a shaft 130 of the prime
mover 126. In some embodiments, the prime mover 126 is a turbine
that can be operated using a variety of means including fluids such
as liquid and compressed gas. In other embodiments, the prime mover
126 is an electric motor that can be operated using a variety of
electrical sources including an alternate current (AC) source and a
direct current (DC) source.
[0052] The device 100 further includes at least one control knob
132 having a portion 134 extending through the slot 122 and
operationally coupled to the prime mover carriage 124. Accordingly,
a longitudinal displacement of the control knob 132 as indicated by
the arrow 136 will induce a longitudinal displacement of the prime
mover carriage 124, and the prime mover 126 included therewith. In
some embodiments, a position of the prime mover carriage 124 within
the intermediate section 110 can be fixed or locked, as needed,
using the control knob 132. For instance, the control knob 132 can
be operated into a locked state for inhibiting the longitudinal
displacement of the control knob 132 and of the prime mover
carriage 124 coupled thereto. The longitudinal displacement of the
control knob 132, and of the prime mover carriage 124 coupled
thereto, can be enabled or permitted by operating the control knob
132 into an unlocked state. In some embodiments, the locked and
unlocked state are attained by rotating the control knob 132. In
alternate embodiments, the control knob 132 can be operated in a
different manner for providing the described functionality. In
other embodiments, alternative configurations can be included for
fixing or locking the position of the prime mover carriage 124,
wherein the control knob 132, or some other means, is used for the
longitudinal displacement of the prime mover carriage 124. All
alternatives as may become apparent to those having ordinary skill
in the art are considered as being within the metes and bounds of
the instant disclosure.
[0053] FIG. 1D is a perspective view of an embodiment of the
exchangeable drive shaft cartridge 104. As illustrated, the
exchangeable drive shaft cartridge 104 includes a proximal section
138, a distal section 140, a drive shaft 142, and a gear engagement
assembly 144. The drive shaft 142 includes a proximal end and a
distal end, and extends through an opening 146 in the distal
section 140. In some embodiments, the opening 146 is through a
distal end of the drive shaft cartridge 104. However, this is
neither required or necessary. For instance, in alternate
embodiments, the drive shaft 142 can extend through an opening in a
side of the distal section 140. The gear engagement assembly 144
includes a drive shaft gear 148 fixedly attached to the proximal
end of the drive shaft 142 such that rotating the drive shaft gear
148 will rotate the drive shaft 142.
[0054] In some embodiments, the prime mover gear 128 and the drive
shaft gear 154 can be removably meshed (or engaged). As such, when
the gears are meshed, operating the prime mover 126 will induce a
rotational movement in the prime mover gear 128, the drive shaft
gear 148 and the drive shaft 142. The rotational movement of the
drive shaft 142 can be stopped by un-meshing (or disengaging) the
prime mover gear 128 and the drive shaft gear 148 and/or by
stopping the prime mover 126. As will be apparent to those having
ordinary skill in the art, the rotational speed of the drive shaft
142 will be determined at least in part by the gear ratio of the
drive shaft gear 148 to the prime mover gear 128 and by the
rotational speed of the prime mover 126. In certain embodiments,
the prime mover gear 128 and the drive shaft gear 148 are
substantially similar in that they are of the same diameter and
have the same number of teeth. In such embodiments, the prime mover
gear 128 and the drive shaft gear 148 will have substantially
similar rotational speeds. In other embodiments, the prime mover
gear 128 and the drive shaft gear 148 can have different rotational
speeds such that one of the two meshed gears rotates faster or
slower than the other. As will be apparent to those having ordinary
skill in the art, this can be accomplished by decreasing the
diameter and increasing the number of teeth for one of the two
gears relative to the other. While the embodiments describe and
illustrate only one prime mover gear 128 and only one drive shaft
gear 142, such arrangements and quantities of gears should not be
considered as limiting. For instance, although not shown, some
embodiments of the device 100 may include a gear box having one or
more additional gears meshed with the one prime mover gear 128 and
the one drive shaft gear 148.
[0055] In some embodiments, the prime mover 126 and the drive shaft
142 are rotatably coupled with a mechanism that can both engage and
disengage the prime mover 126 and the drive shaft 142 from one
another. In a non-limiting exemplary embodiment, the mechanism is a
clutch mechanism, including a magnetic clutch.
[0056] In order to use the device 100, it must be "loaded" by
connecting the handle 102 and the drive shaft cartridge 104 to one
another such that the prime mover gear 128 and the drive shaft gear
148 are meshed. In some embodiments, this is accomplished by
inserting at least the gear engagement assembly 144 into the handle
102 and juxtaposing it with the prime mover carriage 124.
[0057] The channel 112 and the openings 114 and 118 are configured
for passage therethrough of at least the gear engagement assembly
144. The gear engagement assembly 144 is inserted into the opening
114, advanced through the channel 112 and the opening 118, and into
the interior 120 of the intermediate section 110. Thereafter, the
prime mover carriage 124 and the gear engagement assembly 144 are
advanced towards one another, either in combination or individually
one towards the other, until the prime mover gear 128 and drive
shaft gear 148 are aligned with one another. In some embodiments,
before the gear engagement assembly 144 is advanced through the
opening 118, the prime mover carriage 124 is displaced towards the
opening 118 and held thereat by operating the control knob 132 to
its locked state. Thereafter, the gear engagement assembly 144 is
advanced through the opening 118 until the prime mover gear 128 and
drive shaft gear 148 are aligned with one another.
[0058] For ensuring alignment of the prime mover gear 128 and drive
shaft gear 148, some embodiments of the device 100 include at least
one alignment element for guiding at least the gear engagement
assembly 144. In some embodiments of the device 100, at least a
portion of an alignment element is provided in one or more of the
channel 112, the openings 114 and 118, the interior 120, the prime
mover carriage 124, and the gear engagement assembly 144. In
certain embodiments of the device 100, the alignment element can
include at least a first and a second complementary section,
wherein the first section is disposed on the gear engagement
assembly 144 and the second section is disposed on any one or more
of the channel 112, the openings 114 and 118, the interior 120, and
the prime mover carriage 124. For instance, the alignment element
may include a tongue-and-groove configuration, wherein the first
section, i.e., the tongue, is disposed on the gear engagement
assembly 144 and the second section, i.e., the groove, is
contiguously or sectionally (e.g., piece-wise) disposed on one or
more of the channel 112, the openings 114 and 118, the interior
120, and the prime mover carriage 124. Of course, the components or
elements of the device 100 on which the tongue and the groove are
disposed can be reversed. It should be appreciated that it is not
always necessary or a requirement that the alignment element
include both a first and a section. In some embodiments, the
components and/or elements of the device 100 can be configured such
that only one section of the alignment element is required. Some
non-limiting examples for the alignment element include one or more
ramps, ribs, rails, and channels. All alternative configurations
for the alignment element as may become apparent to those having
ordinary skill in the art are considered as being within the metes
and bounds of the instant disclosure.
[0059] A non-limiting exemplary embodiment of an alignment element
having first and second complementary sections is illustrated in
FIGS. 2A-2C. FIG. 2A is a detailed cross-sectional view
illustrating a state of the prime mover carriage 124 without the
gear engagement assembly 144 attached thereto; FIG. 2B is a
detailed cross-sectional view illustrating a state of the prime
mover carriage 124 with the gear engagement assembly 144 attached
thereto; and FIG. 2C is a close-up perspective view of the proximal
section 138 of the drive shaft cartridge 104. In the illustrated
embodiment, the alignment element includes a first and a second
section. The first section, disposed on the prime mover carriage
124, is defined at least in part by an insertion channel 150. In
some embodiments, the insertion channel 150 is defined at least in
part by first and second guides 152 and 154, respectively. In some
embodiments, the second guide 154 is defined at least in part by a
ramped planar surface having a thickness that increases from a
distal end to a proximal end of the second guide 154. The second
section of the alignment element, illustrated in FIG. 2C, is
disposed on at least the proximal section 138 of the drive shaft
carriage 104. In the illustrated embodiment, the second section is
defined at least in part by one or more indents 156, 158 configured
for slidable engagement with one or both of the first and second
guides 152 and 154.
[0060] In some embodiments, the device 100 includes at least one
biasing element for meshing the aligned prime mover gear 128 and
the drive shaft gear 154 such that when the gears are meshed, a
rotational movement of one of the prime mover 126 and the drive
shaft 142 will induce a rotational movement in the other. In some
embodiments, the at least one biasing element displaces at least
the prime mover gear 126 towards a location whereat the drive shaft
gear 142 will be positioned when the gears 126 and 142 are aligned.
In other embodiments, the at least one biasing element displaces at
least the drive shaft gear 142 towards a location whereat the prime
mover gear 126 will be positioned when the gears 126 and 142 are
aligned. In alternate embodiments, the device 100 can include one
or more biasing elements configured for displacing both the prime
mover gear 126 and the drive shaft gear 142 towards one another
when the gears 126 and 142 are aligned. Non-limiting examples of
biasing elements include compression springs, coil springs, leaf
springs, and other suitable components and/or materials.
[0061] FIGS. 2A and 2B illustrate a non-limiting exemplary
embodiment of the device 100 having a spring 160 biasing element
configured for biasing at least the prime mover gear 128 towards
the drive shaft gear 148. When the device 100 is not loaded and/or
the prime mover carriage 124 and the gear engagement assembly 144
are not juxtaposed, the spring 160 pushes at least the prime mover
gear 128 towards the location whereat the drive shaft gear 148 will
be positioned when the gears 128 and 148 will be aligned when the
device 100 is loaded. The alignment element is configured for
inhibiting or minimizing roll, pitch and yaw of the gear engagement
assembly 144 and the prime mover carriage 124 as they are advanced
towards one another when loading the device 100. As the leading
edge of the gear engagement assembly 144 enters the insertion
channel 150 and the prime mover gear 128 and the drive shaft gear
148 advance towards each other, the ramped planar surface of the
second guide 154 causes the proximal section of the prime mover
carriage 124, and at least the prime mover gear 128, to move in a
direction away from the advancing drive shaft gear 148. When the
prime mover carriage 124 and the gear engagement assembly 144 are
appropriately juxtaposed, the prime mover gear 128 and the drive
shaft gear 148 will be aligned, and the gears 128 and 148 will mesh
because of the biasing force from the spring 160. While only one
spring 160 is illustrated and described with reference to the FIGS.
2A and 2B, it should be readily apparent that more than one spring
can be used for providing the required functionality. Accordingly,
all such alternatives are considered as being within the metes and
bounds of the instant disclosure.
[0062] In some embodiments, the prime mover carriage 124 includes
one or more alignment pins 162 and the gear engagement assembly 144
includes one or more correspondingly aligned apertures configured
for receiving the one or more alignment pins 162. The one or more
alignment pins 162 and the one or more apertures are configured and
located such that when the prime mover carriage 124 and the gear
engagement assembly 144 are properly juxtaposed, the prime mover
gear 128 and the drive shaft gear 148 will be aligned as required,
and the one or more alignment pins 162 and the corresponding
aperture will engage. Accordingly, further relative displacement of
the prime mover carriage 124 and the gear engagement assembly 144
will be inhibited and the alignment of the gears 128 and 148 will
be maintain. Spring forces from the one or more biasing elements
will mesh the prime mover gear 128 and the drive shaft gear
148.
[0063] In some embodiments, the drive shaft cartridge 104 includes
a releasable locking feature that engages with a releasable locking
feature on at least one of the handle 102 and the prime mover
carriage 124. In some embodiments, a self-releasing locking
mechanism 204 is provided at or near the proximal end of the prime
moving carriage 124. In the embodiment shown, the self-releasing
locking mechanism 204 is positioned proximal of the prime mover
gear 128. In some embodiments, at least a portion of the proximal
section 138 of the drive shaft cartridge 104 is engaged with the
self-releasing locking mechanism 204. In some embodiments, the
handle 102 also has a self-releasing locking mechanism 206 within
channel 208. In certain embodiments, the one or more self-releasing
locking mechanisms 204 and 206 are configured for inhibiting the
displacement or movement of the prime mover carriage 124 while it
is not connected with the drive shaft cartridge 104. When the
device 100 is "loaded" and the prime mover gear 138 and the drive
shaft gear 148 are meshed, the one or more self-releasing locking
mechanisms 204 and 206 is disengaged.
[0064] FIG. 1B illustrates an alternate embodiment of an elongated
biasing element 164 that may also be used as an alignment element.
The biasing element 164 includes a distal end fixedly or removably
attached to or integrally formed with the drive shaft cartridge 104
at a location distal from the gear engagement assembly 144. In
certain embodiments, the biasing element 164 extends proximally and
is configured such that in the absence of any external force, a
proximal end 166 thereof extends away from the gear engagement
assembly 144. When appropriate force is applied on at least a
portion of the biasing element 164, the proximal end 166 is
displaced in the direction indicated by the arrow 168 towards the
gear engagement assembly 144 and spring force is stored in the
biasing element 164. Then, when the applied force is removed, the
stored spring force will urge the proximal end 166 away from the
gear engagement assembly 144 in the direction opposite that
indicated by the arrow 168.
[0065] Additionally, in some embodiments, the biasing element 164
can be configured as the first section of an alignment element, and
the second section of the alignment element can be disposed on at
least a portion of the handle 102. The second section can be a
groove or similar structure configured for slidable engagement with
the biasing element 164. In some embodiments, the second element is
disposed on, e.g., integrally formed with, the prime mover carriage
124. Additionally, or in the alternative, at least a portion of the
handle 102 distal from the prime mover carriage 124 can include the
second section of the alignment element. For example, the second
section can be disposed on at least one or more of the opening 114
in the distal end 116 of the handle 102, portions of or the entire
channel 112 extending proximally from the opening 114, the opening
118 in the intermediate section 110, and at least a portion of the
interior 120 proximal of the opening 118.
[0066] In some embodiments, the second section of the alignment
element can include an indent 170 configured for removably
receiving the proximal end 166 of the biasing element 164 and
inhibiting further displacement of the drive shaft cartridge 104 in
the proximal direction within the handle 102. In particular, the
displacement of the gear engagement assembly 144 in the proximal
direction within the handle 102 is inhibited. Accordingly, it
should be readily apparent that the proximal end 166 and the indent
170 must have complementary configurations such that the prime
mover gear 128 and the drive shaft gear 148 are aligned when the
proximal end 166 is removably received within the indent 170. For
loading the device 100, the proximal end 166 and the gear
engagement assembly 144 are displaced towards one another and both
are then inserted through the opening 114 into the handle 102. The
gear engagement assembly 144 and the prime mover carriage 124 are
displaced towards one another until the proximal end 166 of the
biasing element 164 is removably received within the indent 170.
The prime mover gear 128 and the drive shaft gear 148 will be
aligned with one another, and the spring force stored within the
biasing element 164 will cause the gears 128 and 148 to mesh.
[0067] Some embodiments of the device 100 can include one or more
release mechanisms for separating, e.g., un-meshing, the meshed
gears 126 and 142 so that the exchangeable drive shaft cartridge
104 can be removed from the handle 102. In other embodiments of the
device 100, one or more of the handle 102, the drive shaft
cartridge 104 and the alignment element can be configured such that
a displacement of the handle 102 and the drive shaft cartridge 104
away from one another will separate the juxtaposed prime mover
carriage 124 and the gear engagement assembly 144 and also
separate, e.g., un-mesh, the meshed gears 126 and 142.
[0068] FIGS. 3A and 3B are partial side views of an embodiment for
meshing the prime mover gear 128 and the drive shaft gear 148 with
one another in an embodiment of the device 100. As described
elsewhere, embodiments of the devices disclosed herein, e.g.,
device 100, include a handle defined at least in part by an
elongated hollow intermediate section. FIG. 3A illustrates a
portion of an interior 302 within an embodiment of an elongated
hollow intermediate section of a handle, e.g., handle 102. As with
interior 120, the interior 302 is configured for housing and for a
linear displacement of a gear engagement assembly 304 and a prime
mover carriage 306. In several respects the embodiments of the gear
engagement assembly 304 and of the prime mover carriage 306,
respectively, are substantially similar to the gear engagement
assembly 144 and the prime mover carriage 124 described elsewhere
with reference to the device 100. As such, the gear engagement
assembly 304 includes a drive shaft gear 308 fixedly attached to a
proximal end of a drive shaft extending distally therefrom. And,
the prime mover carriage 306 includes a prime mover 310 having a
prime mover gear 312 fixedly attached to a shaft 314 thereof.
[0069] As shown, the interior 302 includes a guide rail 316
extending through at least a portion thereof. In some embodiments,
the guide rail 316 divides the interior 302 into at least a first
section 318 and a second section 320. As illustrated, the first
section 318 is configured for accommodating the gear engagement
assembly 304 and the prime mover carriage 306 while the drive shaft
gear 308 and the prime mover gear 312 are aligned with one another
but are not meshed. The second section 320 is configured for
accommodating the gear engagement assembly 304 and the prime mover
carriage 306 after the drive shaft gear 308 and the prime mover
gear 312 are meshed. The guide rail 316 further includes a
transition section 322 extending between the first and the second
sections 318 and 320, respectively. In some embodiments, the
transition section 322 is configured for advancing at least the
aligned drive shaft gear 308 and the prime mover gear 312 towards
one another while the gear engagement assembly 304 and the prime
mover carriage 306 are displaced, either singularly or in
combination, from the first section 318 into the second section
320. As will be apparent, the transition section 322 is therefore
configured for meshing the aligned drive shaft gear 308 and the
prime mover gear 312 when they are displaced from the first section
318 into the second section 320. In the illustrated embodiment,
while the gear engagement assembly 304 and the prime mover carriage
306 are together displaced from the first section 318 into the
second section 320, the transition section 322 causes the prime
mover carriage 306 to pivot about a pivot point 324 such that at
least the prime mover gear 312 is displaced towards, and meshed
with, the drive shaft gear 308. In some embodiments, reversing the
displacement of the gear engagement assembly 304 and the prime
mover carriage 306 from the second section 320 into the first
section 318 will un-mesh the drive shaft gear 308 and the prime
mover gear 312 from one another. The drive shaft cartridge of which
the gear engagement assembly 304 is a component of, can be removed
from the handle and replaced with a different or another similar
drive shaft cartridge having a gear engagement assembly
substantially similar to the gear engagement assembly 304.
[0070] In the first section 318 of the embodiment illustrated in
FIG. 3A, the prime mover carriage 306 is shown tilted about the
pivot point 324 such that the drive shaft gear 308 and the prime
mover gear 312 are separated from, and not meshed with, one
another. In some embodiments, the illustrated tilting of the prime
mover carriage 306 may be due to gravitational forces. Although not
shown, other embodiments can include one or more biasing elements
configured to tilt the prime mover carriage 306 as illustrated.
Non-limiting exemplary biasing elements include coiled springs,
leaf springs and similar components configured to store spring
forces when displace from their "normal" state. For instance, one
or more coil springs, each having a compressed state as its
"normal" state, may be provided whereby, in the first section 318,
the prime mover carriage 306 is tilted as illustrated in FIG. 3A.
Displacing the prime mover carriage 306, with the gear engagement
assembly 304, into the second section 320, as illustrated in FIG.
3B, will "stretch" the one or more springs and store spring forces
therewithin. The subsequent displacement of the prime mover
carriage 306, with the gear engagement assembly 304, from the
second section 320 into the first section 318 will "release" the
spring forces whereby the prime mover carriage 306 will tilt as
illustrated in FIG. 3A, and the drive shaft gear 308 and the prime
mover gear 312 will un-mesh, i.e., separate from one another.
[0071] In order to use the device 100, the distal section 108 of
the handle 102 and the distal section 140 of the drive shaft
cartridge 104 need be coupled to one another such that during use,
the prime mover gear 128 and the drive shaft gear 148 remain meshed
with one another within the handle 102. To that end, embodiments of
the device 100 may include one or more connectors and associated
release mechanisms, respectively, configured for engaging and
separating or disengaging the handle 102 and the drive shaft
cartridge 104 from one another. As stated, such coupling needs to
be releasable because it may be desirable or necessary to replace
the drive shaft cartridge 104 during the procedure. Accordingly,
some embodiments of the one or more connectors include
complementary first and second sections that can be integrally
formed, respectively, with the distal section 108 of the handle 102
and with the distal section 140 of the drive shaft cartridge 104.
The first and second sections are configured for being removably
coupled to each other. It will be readily apparent to one skilled
in the art that the component on which the first and the second
sections are formed can be reversed without affecting the required
functionality. In other words, the functionality of the connector
will not change if the first section is integrally formed with the
distal section 140 of the drive shaft cartridge 104 and the second
section integrally formed with the distal section 108 of the handle
102.
[0072] FIGS. 1A and 1B illustrate an embodiment of a connector
configured for keeping the handle 102 and the drive shaft cartridge
104 connected to one another while the device 100 is in use. The
connector includes a tabbed connector 172 integrally formed with
the distal section 140 of the drive shaft cartridge 104 and one or
more complementary holes 176 integrally formed with the distal
section 108 of the handle 102. The tabbed connector 172 includes
one or more tabs 174, each of which removably engages with a
complementary hole 176 in the distal section 108. When the device
100 is "loaded," i.e., the distal sections 108 and 140 abut one
another, the tabbed connector 172 prevents separation of the handle
102 and the drive shaft cartridge 104 while the device 100 is in
use during a procedure. For "unloading" the device 100, i.e.,
separating the handle 102 and the drive shaft cartridge 104 from
one another, the distal sections 108 and 140 can be disengaged from
one another by applying pressure to the tabs 174 in the direction
indicated by the arrows 178, and displacing the distal sections 108
and 140 away from one another.
[0073] In some embodiments, when the exchangeable drive shaft
cartridge 104 is loaded, and the prime mover gear 128 and the drive
shaft gear 148 are properly meshed and engaged with one another, a
gap may exist between the distal section 140 of the drive shaft
cartridge 104 and the distal end 116 of the handle 102. In some
embodiments, the one or more connectors for removably connecting
the distal end 116 of the handle 102 and the distal section 140 of
the drive shaft cartridge 104 with one another can include a
sealing mechanism for creating a sealed coupling therebetween.
[0074] Alternate exemplary embodiments of one or more connectors
and associated release mechanisms includes snap-fit connectors,
tongue and groove connectors, rails, rotatable connectors, bayonet
mounts and ribs. For instance, in a non-limiting exemplary
embodiments, the sealing mechanism (i.e., the one or more
connectors) can be a bayonet mount wherein a rotational
displacement of the handle 102 and/or the drive shaft cartridge 104
in opposite directions, after being juxtaposed, connects or
disconnects the handle 102 and the drive shaft cartridge 104 from
one another.
[0075] In some embodiments, the one or more connectors for
removably connecting the handle 102 and the drive shaft cartridge
104 with one another is also configured to function as a seal. For
example, the one or more connectors can also form a fluidic seal
that inhibits any flow of fluid therethrough.
[0076] Other embodiments of one or more release mechanisms as may
become apparent to those having ordinary skill in the art are
considered as being within the metes and bounds of the instant
disclosure.
[0077] As illustrated in FIGS. 1A-1C, the device 100 includes a
guide wire clamp or brake 180 in the proximal section 106 of the
handle 102. Engaging the guide wire clamp or brake 180 enables the
user of the device 100 to stop the insertion or retraction of a
guide wire 182 extending through the device 100. When the guide
wire clamp or brake 180 is operated to its dis-engaged state, the
guide wire 182 can then be inserted or retracted.
[0078] In some embodiments, the proximal section 106 of the handle
102 includes at least one control panel 184 through which the user
can monitor and/or control the operation of the device 100. Some
embodiments of the at least one control panel 184 enable the user
of the device 100 to start, stop, change and monitor the rotational
speed of the prime mover 126 which affects the rotational speed of
the drive shaft 142. Certain embodiments of the at least one
control panel 184 enable the user of the device 100 to monitor
and/or control the flow of saline. Some embodiments of the device
100 may include one or more fiber optic cables extending into the
vasculature of a patient. In such embodiments of the device 100,
the at least one control panel 184 may be configured for displaying
visuals, e.g., images, of the interior of the vasculature. Certain
embodiments of the device 100 may include one or more sensors for
sensing conditions such as whether or not the handle 102 and the
drive shaft cartridge 104 are properly coupled as required for
operating the device 100. The one or more sensors may also include
means for sensing parameters such as the environmental conditions
(e.g., temperature, pressure, etc.) within the vasculature and/or
the physical conditions (e.g., thickness, pliability, etc.) of the
vasculature. Accordingly, some embodiments of the at least one
control panels 184 may be configured for displaying the sensed
conditions. Certain embodiments of the at least one control panels
184 may include at least a micro-processor, memory, display
interfaces, input/output ports or interfaces, etc. All
functionalities of the at least one control panel 184 as may become
apparent to those having ordinary skill in the art are considered
as being within the metes and bounds of the instant disclosure.
[0079] As described elsewhere, certain embodiments of the device
100 include one or more sensors for detecting whether or not the
handle 102 and the drive shaft cartridge 104 are properly
connected. More specifically, the one or more sensors are
configured to detect whether or not the distal end 116 of the
handle 102 and the proximal end of the distal section 140 are
properly connected. If proper connection as required for operating
the device 100 is not detected, the drive shaft 142 may be
inhibited from advancing and/or rotating. This is also applicable
for embodiments wherein the drive shaft 142 is configured as a
telescoping drive shaft as illustrated in FIG. 1E.
[0080] In some embodiments of the device 100, the distal section
140 of the drive shaft cartridge 104 includes a nosecone 186. In
embodiments of the device 100 wherein the drive shaft 142 is
telescoping, the nosecone 186 and the drive shaft cartridge 104 are
configured for being removably attached to one another. FIG. 1F
illustrates an embodiment wherein the nosecone 186 includes a
proximally extending structure 188 and the drive shaft cartridge
104 includes an output gear hypotube 190. As shown, a proximal
section 192 of the structure 188 and a distal section 194 of the
hypotube 190 include complementary elements 196 and 198,
respectively, configured for removably connecting the structure 188
and the hypotube 190 with one another. In some embodiments, the
complementary elements 196 and 198 respectively include a
spring-biased tab and an indent configured for slidable engagement
with one another. In certain embodiments, the spring-biased tab is
configured as a leaf spring. In other embodiments, the
complementary elements 196 and 198 respectively include a
spring-biased ball and a depression configured for slidable
engagement with one another. Of course, the configurations of the
complementary elements 196 and 198 can be reversed. Furthermore,
the described and illustrated embodiments are exemplary and, as
such, should not be construed as being limiting. Modifications or
alternate embodiments for removably connecting the nosecone 186 and
the hypotube 190 are considered as being within the metes and
bounds of the instant disclosure.
[0081] In use, when the drive shaft 142 is in the retracted state
and not telescoping, the structure 188 and the hypotube 190 are
connected or coupled to one another at their respective proximal
and distal sections 192 and 194. In some embodiments, the device
100 must be "loaded" in order to telescope the drive shaft 142. If
the device 100 is "unloaded", one or more locking mechanisms (not
shown) inhibit the drive shaft 142 from being telescoped. When the
device 100 is "loaded", the one or more locking mechanism(s) are
disengaged, and the drive shaft 142 can be telescoped by displacing
the nosecone 186 and the handle 102 in opposite directions away
from each other.
[0082] In certain embodiments, the structure 188 and the hypotube
190 include complementary alignment elements for aiding the
insertion of the proximal section 192 into the distal section 194.
In the illustrated embodiment, the hypotube 190 includes an
outwardly flaring distal end 200, and the structure 188 includes an
inwardly tapering proximal end 202. The described embodiment should
not be construed as being limiting. In alternate embodiments, the
distal section 194 of the hypotube 190 can be configured for
insertion into and retraction from the proximal section 192 of the
structure 188.
[0083] Certain embodiments of the device 100 include a saline
infusion port in fluid communication with a saline reservoir. The
device may further include an internal saline tube configured for
transporting the saline from the infusion port to an inner lumen of
a catheter. As such, the saline from the reservoir may be used for
reducing friction between the rotating drive shaft 142 and any
non-rotating components disposed within and/or around the drive
shaft 142. The saline from the reservoir may also be used as a heat
transfer fluid.
[0084] FIG. 4A is a perspective view of a distal section 402 in an
embodiment of an exchangeable drive shaft cartridge for another
embodiment of a rotational atherectomy device. The distal section
402 includes a tubular section 404 having a trough 406 extending
proximally therefrom, and a tubular nosecone 408 extending distally
therefrom. The tube of the tubular section 404 is contiguous at its
first open end with the trough 406, and is contiguous at its second
open end, opposite the first open end, with a first open end of the
tube of the nosecone 408. A second open end, opposite the first
open end, of the tube of the nosecone 408 defines the opening 146
in a distal end 410 of the distal section 402. As such, the distal
section 402 is configured for passage therethrough of the drive
shaft 142 fixedly attached at its proximal end to the drive shaft
gear 148 and having a distal end configured for insertion into a
vasculature of a patient. While the distal section 402 is
illustrated as having a generally circular cross-section
throughout, the geometrical shape should not be considered as a
requirement and/or limiting. Alternate shapes extending the entire
distal section 402 and/or on portions thereof are considered as
being within the metes and bounds of the instant disclosure.
[0085] FIG. 4B is a cross-section view of the trough 406 along a
plane extending through the sectional line B-B shown in FIG. 4A. In
the illustrated embodiment, the trough 406 has a generally U-shaped
geometry having a channel 412 defined at least in part by opposing
walls 414 and 416. However, this specific geometrical shape for the
trough 406 should be considered as a requirement and/or limiting.
Alternate configurations as may become apparent to those having
ordinary skill in the art are considered as being within the metes
and bounds of the instant disclosure.
[0086] The distal section 402 is illustrated having a
longitudinally extending fin 418 on at least a portion thereof. In
FIG. 4A, the fin 418 is illustrated as extending along the entire
length of the tubular section 404 and the trough 406. However, the
longitudinal extent of the fine 418 and/or its location on the
external surface of the distal section 402 should not be considered
as a requirement and/or limiting. In some embodiments, the fin 418
extends along only portions of the tubular section 404 and/or the
trough 406. In certain embodiments, the fin 418, and/or portions
thereof, are positioned at one or more locations on the external
surface of the distal section 402. All alternative shapes, sizes,
locations, etc., for the fin 418, as may become apparent to those
having ordinary skill in the art are considered as being within the
metes and bounds of the instant disclosure.
[0087] With reference to FIGS. 4A and 1B, it should be apparent
that the respective distal sections 402 and 140 of the drive shaft
cartridges are substantially different from one another.
Accordingly, the distal sections of the handles through which the
drive shaft cartridges having the distal sections 402 and 140 are
inserted for removable coupling with the handle also need to be
different from one another. FIG. 4C is a perspective view of an
embodiment of a handle 420 having a distal section 422 different
from the distal section 108 of the handle 102 illustrated in FIG.
1B. In several other aspects, the handles 420 and 102 are
substantially similar to one another. A top view of at least a
portion of the distal section 422 proximate a distal end 424 of the
handle 420 is illustrated in FIG. 4D.
[0088] In general, the cross-section of the distal section 422 of
the handle 420 through which the drive shaft cartridge is inserted
and the cross-section of at least the tubular section 404 of the
distal section 402 are complementary and/or substantially similar.
As illustrated in FIG. 4D, the distal section 422 includes a
channel 426 defined at least in part by opposing guard rails or
walls 428 and 430. The channel 426 and the opposing guard rails 428
and 430 extend proximally from an opening 432 in the distal end
424, and are configured for slidable coupling with at least the fin
418, the tubular section 404 and the trough 406 of the distal
section 402 of the drive shaft cartridge. In some embodiments, the
channel 426 and the opposing guard rails 428 and 430 are configured
for aligning the distal sections 402 and 422 with one another.
[0089] In some embodiments, the distal end 424 and at least a
portion of the distal section 422 proximal thereof is configured
for removably connecting with at least a portion of the nosecone
408 of the distal section 402. In certain embodiments, the device
includes at least one connector having complementary first and
second sections 434 and 436, respectively, disposed on the nosecone
408 and the distal section 422, and configured for connecting and
dis-connecting the nosecone 408 and the distal section 422.
[0090] For "loading" the device, the gear engagement assembly 144
is inserted through the opening 432 into the handle and is
removably connected with the prime mover carriage 124 housed within
the interior 120 in the intermediate section 110 of the handle 420.
As described elsewhere, the prime mover gear 128 and the drive
shaft gear 148 will mesh when the prime mover carriage 124 and the
gear engagement assembly 144 are connected with one another. Next,
as indicated by the directional arrow 438, the trough 406 and the
tubular section 404 of the distal section 402 are inserted into the
distal section 422 of the handle 420 through the opening 432. The
distal section 402 and at least the distal section 422 of the
handle 420 are displaced in opposite directions towards each other
until the first and second sections 434 and 436 of the connector
engage one another. In the illustrated embodiment, to "unload" the
device, for example to change or replace the drive shaft cartridge,
the distal section 402 and at least the distal section 422 of the
handle 420 are displaced in opposite directions away from each
other while concurrently pushing or pressing at least the first
section 434 of the connector in the direction indicated by the
arrow 440. Concurrently, or subsequently, the gear engagement
assembly 144 and the prime mover carriage 124 are disconnected and
the gear engagement assembly 144 is removed from the handle 420
through the opening 432.
[0091] FIG. 5 is a perspective view of another embodiment of a
rotational atherectomy device 500 in a dis-assembled state.
Elements and components of the device 500 that are substantially
similar or the same as those in other embodiments of the device are
identified with the same reference numerals. The device 500
includes a handle 502 and an exchangeable drive shaft cartridge
504, wherein the handle 502 and the drive shaft cartridge 504
include one or more connectors configured for removably connecting
the handle 502 and the drive shaft cartridge 504 to one
another.
[0092] Some embodiments of the handle 502 include a proximal
section 106, a distal section 508, and an elongated intermediate
section 510. The distal section 508 includes a channel 512
extending proximally from an opening 514 in a distal end 516 of the
handle 502. Certain embodiments of the intermediate section 510
include a trough 518 extending between the proximal and distal
sections 106 and 508, respectively, of the handle 502. The trough
518 is configured for housing and longitudinal displacement of a
prime mover carriage 520 disposed therewithin. The prime mover
carriage 520 includes a prime mover 522 and a prime mover gear 524
fixedly attached to a shaft of the prime mover 522.
[0093] Certain embodiments of the drive shaft cartridge 504 include
a proximal section 526, a distal section 528, and an intermediate
section 530 having a slot 532 extending longitudinally between the
proximal and distal sections 526 and 528, respectively. The drive
shaft cartridge further includes at least one control knob 534
having at least a portion thereof extending through the slot 532
and operationally coupled to a gear engagement assembly 536.
Operationally and functionally, the control knob 534 is
substantially similar to the control knob 132 of the device 100. In
particular, longitudinal displacement of the control knob 534 along
the slot 532 will induce a similar longitudinal displacement of the
gear engagement assembly 536. As with the control knob 132, the
control knob 534 can be operated between locked and unlocked
states. The gear engagement assembly 536 includes a drive shaft
gear 538 fixedly attached to a proximal end of a drive shaft
extending distally therefrom and through an opening in the distal
section 528 of the drive shaft cartridge 504.
[0094] In order to use the device 500, the handle 502 and the
exchangeable drive shaft cartridge 504 may be removably connected
to each other as follows. The control knob 534 is used for
proximally displacing the gear engagement assembly 536 and
positioning it proximate to and/or within the proximal section 526
of the drive shaft cartridge 504. In some embodiments, such as that
illustrated in FIG. 5, the gear engagement assembly 536 may be
positioned such that a portion thereof and/or the drive shaft gear
538 extends proximally beyond the proximal end 544. Also as
illustrated, the prime mover carriage 520 is located proximate a
distal end 546 of the trough 518. The prime mover gear 524 and the
drive shaft gear 538 are aligned and then meshed by juxtaposing the
prime mover carriage 520 and the gear engagement assembly 536.
Concurrently, the handle 502 and the drive shaft cartridge 504 are
displaced towards one another until the proximal end 544 of the
proximal section 526 (i.e., the drive shaft cartridge 504) and the
distal end 542 of the proximal section 506 are removably coupled.
Some embodiments of the device 500 may include complementary
sections of one or more alignment elements for assisting with
and/or maintaining the alignment of the prime mover gear 524 and
the drive shaft gear 538. Non-limiting exemplary embodiments of the
one or more alignment elements include tongue-and-groove, rails,
channels and ribs. Certain embodiments of the device 500 may
include complementary sections of one or more connectors for
removably coupling the prime mover carriage 520 and the gear
engagement assembly 536. Non-limiting exemplary embodiments of the
one or more connector include tabbed connectors and snap-fit
connectors.
[0095] Embodiments of the device 500 include one or more connectors
having complementary first and second sections configured for
removably coupling (or connecting) the handle 502 and the drive
shaft cartridge 504 to each other. Some embodiments of the
connector include one or more slidable tabs 540 integrally formed
with the proximal section 506 of the handle 502 and complementary
tab receptors (not shown) integrally formed with a proximal section
526 of the drive shaft cartridge 504. While FIG. 5 illustrates only
one slidable tab 540 at a distal end 542 of the proximal section
506, this should not be construed as being limiting. It should be
realized that most embodiments of the device 500 will include one
or more additional slidable tabs integrally formed with the
proximal section 506 at the distal end 542 thereof. For example,
the proximal section 506 may include a slidable tab on the side or
wall opposite the side or wall on which the slidable tab 540 is
illustratively disposed. Additionally, or in the alternative, the
distal end 542 of the proximal section 506 may include a slidable
tab integrally formed on the same side or wall on which the control
panel 184 is illustratively disposed. Although not shown in FIG. 5,
it should be readily apparent that for each of the one or more
slidable tabs 540, the drive shaft cartridge 504 will include a
complementary tab receptor integrally formed with the proximal
section 526 at a proximal end 544 thereof. Of course, it is neither
necessary nor a requirement that the one or more connectors include
complementary slidable tabs 540 and tab receptors. Alternative
configurations of the one or more connectors as may become apparent
to those having ordinary skill in the art are considered as being
within the metes and bounds of the instant disclosure. For example,
the one or more connectors may include snap-fit connectors and
tongue and groove connectors.
[0096] Some embodiments of the device 500 may include one or more
alternative and/or additional connectors having first and second
sections configured for removably coupling (or connecting) the
handle 502 and the drive shaft cartridge 504 to each other. The
handle 502 may be considered as a lower section of the device 500,
and the drive shaft cartridge 504 may be considered as an upper
section of the device 500. For example, the embodiment of the
device 500 illustrated in FIG. 5 includes a first section 546
integrally formed with the distal section 508 of the handle 502,
and a complementary second section (not shown) integrally formed
with the distal section 528 of the drive shaft cartridge 504. The
first and second sections of such connectors are configured for
removably coupling at least the distal sections 508 and 528,
respectively, of the handle 502 and the drive shaft cartridge 504.
In some embodiments, such as that illustrated in FIG. 5, the handle
502 and the drive shaft cartridge 504 are displaced towards one
another as indicated by the directional arrow 548, and are
thereafter removably coupled by displaced the distal sections 508
and 528 towards one another as indicated by the directional arrow
550. In some embodiments, the connector at the distal section of
the device 500 (i.e., in the distal sections 508 and 528) may be
further configured as an alignment element such as a
tongue-and-groove connector for slidable coupling with or without
snap connectors or tab connectors. In certain embodiments, the
device 500 may include additional and/or alternative alignment
elements and/or connectors, each having complementary first and
second sections integrally formed with the longitudinally extending
opposing side edges of the handle 502 and the drive shaft cartridge
504. For example, the first sections may be integrally formed with
the opposing side edges 552 and 554 of the handle 502, with the
complementary second sections, respectively, integrally formed with
the opposing side edge 556 and the side edge not shown of the drive
shaft cartridge 504. All alternative configurations for the one or
more connectors and/or the one or more alignment elements as may
become apparent to those having ordinary skill in the art are
considered as being within the metes and bounds of the instant
disclosure.
[0097] FIG. 6 is a perspective view of yet another embodiment of a
rotational atherectomy device 600 in a dis-assembled state.
Elements and components of the device 600 that are substantially
similar or the same as those in other embodiments of the device are
identified with the same reference numerals. Device 600 includes a
handle 602 and an exchangeable drive shaft cartridge 604, wherein
the handle 602 and the drive shaft cartridge 604 include one or
more connectors configured for removably connecting the handle 602
and the drive shaft cartridge 604 to one another. The handle 602
includes a proximal section 106, a distal section 606, and an
elongated hollow intermediate section 110 extending between the
proximal and distal sections 106 and 606, respectively. The
intermediate section 110 includes the opening 118 between the
interior 120 thereof and a trough 608 in the distal section 606
configured for receiving the gear engagement assembly 144. The
drive shaft cartridge 604 includes a distal section 610 having an
opening in a distal end 612 thereof configured for passage
therethrough of the drive shaft 142 extending distally from the
gear engagement assembly 144.
[0098] The handle 602 and the drive shaft cartridge 604 are
removably connected by first inserting the gear engagement assembly
144 through the opening 118 into the interior 120 of the
intermediate section 110. The gear engagement assembly 144 and the
prime mover carriage 124 within the interior 120 are removably
coupled as described elsewhere with reference to device 100. Then
the handle 602 and the drive shaft cartridge 604 are removably
connected by juxtaposing the distal sections 606 and 610, and
displacing the handle 602 and the drive shaft cartridge 604 towards
one another.
[0099] In FIG. 6, the device 600 is illustrated having a first and
a second connector, each having complementary first and section
sections configured for removably connecting the handle 602 and the
drive shaft cartridge 604. The first section of the first connector
is shown as opposing hooks 614 and 616 integrally formed with
respective opposing side walls and/or edges 618 and 620 of the
distal section 606. The complementary second section of the first
connector includes hook receptors (not shown) for the hooks 614 and
616 are integrally formed with the opposing side walls and/or
edges, e.g., wall/edge 622, of the distal section 610. The hook
receptors are configured for removably receiving the hooks 614 and
616. When the juxtaposed handle 602 and the drive shaft cartridge
604 are displaced towards one another, the hooks 614 and 616 are
slidably and removably received in the hook receptors in the distal
section 610.
[0100] The second connector for removably connecting the handle 602
and the drive shaft cartridge is a tabbed connector. The first
section of the tabbed connector is shown as a tab 624 integrally
formed with the distal section 610 at a proximal end (or edge or
wall) 626 thereof. The complementary second section of the second
connector is shown as a tab receptor 628 integrally formed with the
handle 602 at a distal end (or edge or wall) 630 of the
intermediate section 110. The tab receptor 628 is configured for
slidably and removably receiving at least a portion of the tab 624.
When the juxtaposed handle 602 and the drive shaft cartridge 604
are displaced towards one another, the tab 624 is slidably and
removably received by the tab receptor on the handle 602.
[0101] In some embodiments, the device 600 includes one or more
alignment elements having complementary first and second sections
configured for aligning the distal sections 606 and 610 with one
another in preparation for or while removably connecting the handle
602 and the drive shaft cartridge 604 with one another. In certain
embodiments, the one or more alignment elements are configured as
tongue-and-groove elements integrally formed with side edges of the
distal sections 606 and 610.
[0102] In some embodiments, the first and the second connectors
operate concurrently for removably connecting the handle 602 and
the drive shaft cartridge 604. In certain embodiments, one of the
first and the second connectors operates before the other.
Additionally or in the alternative, one or both of the first and
the second connectors may be configured as a first and a second
alignment element for aligning the distal sections 606 and 610,
respectively, of the handle 602 and the drive shaft cartridge
604.
[0103] For replacing or exchanging an installed drive shaft
cartridge 604 with another, the first and the second connector are
operated to disengage their respective first and second sections,
and the handle 602 and the drive shaft cartridge 604 are displaced
away from one another The gear engagement assembly 144 is then
removed from the intermediate section 110 through the opening 118.
Some embodiments of the device 600 include a support 632 for
holding the gear engagement assembly 144 proximate the opening 118
and aligning them prior to inserting the gear engagement assembly
144 into the interior 120 of the intermediate section 110 through
the opening 118. The support 632 can also be used for holding the
gear engagement assembly 144 when it is removed from the interior
120 of the intermediate section 110 through the opening 118. The
support 632 may also be configured for protecting at least a
portion of the gear engagement assembly 144, including the drive
shaft gear 148, while the handle 602 and the drive shaft cartridge
604 are not connected.
[0104] While specific configurations have been described with
reference to the first and the second connector and with reference
to the one or more alignment elements, additional and/or
alternative embodiments will become apparent to those having
ordinary skill in the art. All such additional and/or alternative
embodiments configured for providing the same or substantially
similar functionalities are considered as being within the metes
and bounds of the instant disclosure.
[0105] FIG. 7A is a perspective view of an embodiment of a
rotational atherectomy device 700 in a dis-assembled state.
Elements and components of the device 700 that are substantially
similar or the same as those in other embodiments of the device are
identified with the same reference numerals. Device 700 includes a
handle 702 and an exchangeable drive shaft cartridge 704, wherein
the handle 702 and the drive shaft cartridge 704 include one or
more connectors configured for removably connecting the handle 702
and the drive shaft cartridge 704 to one another. The handle 702
includes the proximal section 106, a distal section 706, and an
elongated hollow intermediate section 708 extending between the
proximal and distal sections 106 and 706, respectively. The
intermediate section 708 includes a door 710 operable for accessing
the interior 120 thereof, and the opening 118 between the interior
120 and the trough or channel 112 in the distal section 706. The
drive shaft cartridge 704 includes the drive shaft 142 extending
distally from the gear engagement assembly 144, and a distal
section 712 having an opening at a distal end thereof through which
the drive shaft 142 extends. Although not shown, and as with other
embodiments of the device, the device 700 includes one or more
connectors each having complementary first and second section
configured for removably connecting the distal sections 706 and 712
to one another. As with other embodiments of the device, the device
700 can include one or more alignment elements.
[0106] FIG. 7B is a detailed side view illustrating a pivoting
connector 714 configured for removably and pivotably coupling the
prime mover carriage 124 and the gear engagement assembly 144 to
one another. The pivoting connector 714 is further configured for
aligning and meshing the prime mover gear 128 and the drive shaft
gear 148. The pivoting connector 714 includes a pivot point or axis
716 and complementary first and second sections integrally formed
with the prime mover carriage 124 and the gear engagement assembly
144. The prime mover carriage 124 and the gear engagement assembly
144 are pivotably and removably connected at their respective first
and second sections.
[0107] For "loading" the device 700, the interior 120 of the
intermediate section 708 is exposed by opening the door 710. The
prime mover carriage 124 and the gear engagement assembly 144 are
pivotably and removably coupled at the pivot point or axis 716 of
the pivoting connector 714 such that the prime mover gear 138 and
the drive shaft gear 148 are aligned. Next, the distal sections 706
and 712 are juxtaposed by displacing them towards each other by
rotating the handle 702 and the drive shaft cartridge 704 about the
pivot point or axis 716. The prime mover gear 138 and the drive
shaft gear 148 will be meshed when the distal sections 706 and 712
are removably connected. Thereafter, the door 710 is closed, and
the device 700 is ready for use. For "unloading" the device 700,
the process for "loading" the device 700 is performed in
reverse.
[0108] FIG. 8 is a side view of another embodiment of a rotational
atherectomy device 800 in a partially dis-assembled state. Elements
and components of the device 800 that are substantially similar or
the same as those in other embodiments of the device are identified
with the same reference numerals. Device 800 includes a handle 802
and an exchangeable drive shaft cartridge 804 configured for being
removably connected. In some embodiments, the device 800 includes a
first connector and a second connector, each having complementary
first and second sections configured for removably connecting the
handle 802 and the drive shaft cartridge 804 to each other.
[0109] In FIG. 8, the first connector is illustrated as a pivoting
connector having a first section integrally formed with a distal
section 806 of the handle 802, and a second section integrally
formed with an intermediate section 808 of the drive shaft
cartridge 804. The second connector is illustrated as a tabbed
connector wherein the first section is a slidable tab 810
integrally formed with an elongated hollow intermediate section 812
of the handle 802, and wherein the second section is a tab receptor
(not shown) integrally formed with a proximal section 814 of the
drive shaft cartridge 804. The illustrated locations of the first
and the second connectors are primarily for the purpose of
describing the device 800. Of course, the complementary first and
second sections, respectively, of the first and the second
connector can be formed elsewhere on the handle 802 and the drive
shaft cartridge 804 subject to providing the required
functionality, including ensuring that the prime mover gear 128 and
the drive shaft gear 148 will be aligned for proper meshing when
the handle 802 and the drive shaft cartridge 804 are removably
connected.
[0110] For "loading" the device 800, the first and second sections
of the first connector are used for pivotably and removably
connecting the distal section 806 of the handle 802 and the
intermediate section 808 of the drive shaft cartridge 804 with one
another. Next, the intermediate section 812 of the handle 802 and
the proximal section 814 of the drive shaft cartridge 804 are
juxtaposed by displacing them towards each other by rotating the
handle 802 and the drive shaft cartridge 804 about a pivot point or
axis 816 of the pivotable first connector. Then, the prime mover
carriage 124 and the gear engagement assembly 144 are positioned
such that the prime mover gear 128 and the drive shaft gear 148 are
aligned. Thereafter, the first and second sections of the second
connector will operate, automatically or manually, to removably
connect the intermediate section 812 and the proximal section 814
to one another. And, the prime mover gear 128 and the drive shaft
gear 148 will be meshed. The second connector can also be operated
to dis-connect the intermediate section 812 of the handle 802 and
the proximal section 814 of the drive shaft cartridge 804 from one
another.
[0111] Some embodiments of the device 800 include a third connector
having complementary first and second sections for removably
connecting the handle 802 and the drive shaft cartridge 804 to one
another at locations in addition to or alternatively to the first
and the second connectors. FIG. 8 illustrates a third connector for
an additional removable connection between the handle 802 and the
drive shaft cartridge 804. In some embodiments, the third connector
is configured as a tabbed connector having a first section 818
integrally formed with the intermediate section 812 of the handle
802, and the second section integrally formed with the intermediate
section 808 of the drive shaft cartridge 804. The third connector
can be configured for operating automatically or by a user of the
device 800 after or concurrently with the second connector.
[0112] For "unloading" the device 800, the process for "loading"
the device 800 is performed in reverse. As with other embodiments
of the device, the device 800 can include one or more alignment
elements.
[0113] FIG. 9 is a side view of yet another embodiment of a
rotational atherectomy device 900 in a partially dis-assembled
state Elements and components of the device 900 that are
substantially similar or the same as those in other embodiments of
the device are identified with the same reference numerals. With
reference to FIGS. 8 and 9, it should be apparent that the
respective illustrated devices 800 and 900 are substantially
similar to each other. One difference between the devices 800 and
900 is that locations of the first and the second connectors are
swapped. Specifically, the first connector, configured as a
pivoting connector, pivotably and removably connects an elongated
hollow intermediate section 902 of a handle 904 to a proximal
section 906 of an exchangeable drive shaft cartridge 908. And, the
second connector, configured as a tabbed connector, removably
connects a distal section 910 of the handle 904 and an intermediate
section 912 of the drive shaft cartridge 908 to one another.
[0114] For "loading" the device 900, the first and second sections
of the first connector are used for pivotably and removably
connecting the intermediate section 902 of the handle 904 and the
proximal section 906 of the drive shaft cartridge 908 to one
another. Next, the prime mover carriage 124 and the gear engagement
assembly 144 are position such that the prime mover gear 128 and
the drive shaft gear 148 are aligned. Then, the distal section 910
of the handle 904 and the intermediate section 912 of the drive
shaft cartridge 908 are juxtaposed by displacing them towards each
other by rotating the handle 904 and the drive shaft cartridge 908
about a pivot point or axis 914 of the pivotable first connector.
Thereafter, the first and second sections of the second connector
will operate, automatically or manually, to removably connect the
distal section 910 of the handle 904 and the intermediate section
912 of the drive shaft cartridge 904 to one another. And, the prime
mover gear 128 and the drive shaft gear 148 will be meshed. The
second connector can also be operated to dis-connect the distal
section 910 of the handle 904 and the intermediate section 912 of
the drive shaft cartridge 904 from one another. As with device 800,
the device 900 can also include a substantially similar third
connector.
[0115] For "unloading" the device 900, the process for "loading"
the device 900 is performed in reverse. As with other embodiments
of the device, the device 900 can include one or more alignment
elements.
[0116] FIG. 10 illustrates an embodiment of a system 1000
configured for identifying, monitoring, and controlling the
operation of a plurality of devices and components used for
performing atherectomy. In some embodiments, at least a portion of
the system 1000 is configured for wireless or contact-less
communications 1002 between two or more devices and components used
for performing atherectomy. In certain non-limiting exemplary
embodiments, the mode of communications 1002 includes one or more
of radio frequency (RF) and infra-red (IR), among others. In some
embodiments, the system 1000 includes one or more wireless or
contact-less identification tags, e.g., NFC/RFID tag, 1004 disposed
on one or more devices and components of a rotational or orbital
atherectomy device. In a non-limiting exemplary embodiments, the
one or more identification tags 1004 provide a contact-less means
for identifying different shafts/crowns or accessories 1006
attached to a rotational or orbital atherectomy device (OAD) 1008.
The identifying information would allow the main control board 1010
to vary its operational parameters as needed to properly control or
interface with the attachment 1006. In certain embodiments, the one
or more identification tags can be disposed on one or more devices
and/or components used with the OAD.
[0117] In a non-limiting exemplary embodiment, the one or more
identification tags 1004 can be disposed on a removable portion of
the OAD and, when attached to the main body of the device, an
NFC/RFID reader 1012 would identify the attachment 1006 and obtain
its operational parameters. The reader 1012 then communicates 1014
this information to the control board 1010. In some embodiments,
the one or more identification tags 1004 are configured for storing
data that can be used for analysis. In certain embodiments, device
and/or component usage statistics such as, total run time, time
spent at various speeds, etc., can be used for generating a
snapshot of the atherectomy procedure.
[0118] In some embodiments, the one or more identification tags
1004 can be used as a safety mechanism such as not allowing the OAD
to operate if a required attachment is not connected. In certain
embodiments, the one or more identification tags can be used for
inventory management and tracking data 1016 that can be collected
in the field and transmitted to a remote center, e.g., remote
servers, 1018. In a non-limiting exemplary embodiment, WiFi and/or
cellular networks can be used for the transmission using a
smartphone 1020 after collecting the data from the tag 1004.
[0119] In certain embodiments, the one or more identification tags
are configured for harvesting energy for providing energy or power
for operating the one or more components and devices of the system
1000. Some non-limiting exemplary embodiments for harvesting energy
include harvesting RF energy.
[0120] The descriptions of the embodiments and their applications
as set forth herein should be construed as illustrative, and are
not intended to limit the scope of the disclosure. Features of
various embodiments may be combined with other embodiments and/or
features thereof within the metes and bounds of the disclosure.
Upon study of this disclosure, variations and modifications of the
embodiments disclosed herein are possible, and practical
alternatives to and equivalents of the various elements of the
embodiments will be understood by and become apparent to those of
ordinary skill in the art. Such variations and modifications of the
embodiments disclosed herein may be made without departing from the
scope and spirit of the invention. Therefore, all alternatives,
variations, modifications, etc., as may become to one of ordinary
skill in the art are considered as being within the metes and
bounds of the instant disclosure.
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