Magnaretractor system and method

Abstract

A system and method for performing surgical procedures within a body cavity, e.g. abdomen, uses a magnetized device is utilized to allow a surgeon to control intra-abdominal organs and objects. The system and method allows a surgeon to perform an intra-abdominal procedure without the need to position surgical tools inside of the body cavity. Additional surgical ports are not necessary as the magnetized device allows the surgeon to retract or position various objects within the abdomen.

Description

FIELD OF INVENTION

The present invention is directed generally to surgical apparatus, systems and methods for use in subjects including humans and animals, and to apparatus, systems and methods of manipulating objects within the body of a subject when performing laparoscopy.

BACKGROUND OF INVENTION

When performing laparoscopic surgery in a body cavity such as the abdomen, the number of surgical instruments which can be manipulated in the abdomen is limited by the number of abdominal ports incised. Accordingly, the number of organs and tissues the surgeon can manipulate simultaneously is limited by the number of instruments in place.

In a standard laparoscopy for endometriosis, for example, a camera is placed through the umbilical port, and two lower quadrant ports are made for use with instruments. In order to access, excise or fulgurate endometriosis deep in the pelvis or behind an ovary, the ovary must be retracted. An instrument is inserted into one port and used for the purpose of grasping and retracting the ovary. It is often difficult to control the ovary with the grasper, often resulting in unwanted and uncontrolled movement of the ovary. With the camera inserted through the umbilical port and the grasper inserted through a second port, there is only one port left available to the surgeon. Since there is only one port available, the process of fulgurating or excising the endometrial implants is thereby made more difficult, because in order to avoid damaging the underlying tissues, the peritoneum must be tented up. The surgeon must tent the peritoneum and fulgurate or excise the endometrial implants with a single instrument, or alternatively, incise one or more additional ports. The addition of operating instruments then will require the surgeon to relinquish control of the grasper since only two instruments can be manipulated at one time.

However, additional ports and instruments are not desirable for many reasons. Every additional port requires an accompanying abdominal incision, which pierces the peritoneum and abdominal muscles, and increases the risk of striking a blood vessel and infection. Furthermore, each incision carries cosmetic implications for the patient, as a visible scar may be formed.

In addition to the problem of adding ports to allow additional instruments into the abdominal cavity, there is a problem of limited workspace within the abdominal cavity. As more instruments are introduced into the abdomen, the area can become congested. With this congestion, instruments may inadvertently block or bump into each other, making the procedure more difficult for the surgeon and increasing the risk for the patient.

For example, in a laparoscopic hysterectomy, it is often difficult to retract the uterus in the beneficial manner possible in an open abdominal hysterectomy. In an open abdominal hysterectomy, a cork screw tool is often placed in the fundus of the uterus and used for upward traction in order to decrease bleeding. The traction on the uterus also makes it easier to access the lateral sides of the uterus and suture and ligate the uterine arteries and cardinal ligaments. To do this laparoscopically, the surgeon must try and place an extra port and use a grasper to retract the uterus—often a very difficult task. Additionally, the extra grasper often causes instrument clutter with the other instruments being used to carry out the dissection.

Furthermore, the surgeon is physically limited to controlling two instruments at a time, i.e., one instrument per hand. If it is elected to use an additional instrument to perform a function such as retraction of an ovary or manipulation of the uterus, the surgeon will encounter the problem of not being able to manipulate all of the instruments simultaneously.

In light of these problems, it would be desirable to have a laparoscopic system whereby a surgeon might retract and manipulate intra-abdominal organs and objects without the necessity of placing extra ports, as well as having the ability to gain better control over organs and perform functions currently not possible laparoscopically. It would also be desirable to have a system whereby a surgeon might manipulate intra-abdominal organs and objects without the added congestion of the abdominal cavity associated with the introduction of additional intra-abdominal instruments.

SUMMARY OF THE INVENTION

The present invention is a laparoscopic surgical method and system using magnetic fields such as those produced by magnets and tools responsive to these magnetic fields to allow a surgeon to retract and control intra-abdominal organs and objects without the necessity of having to place additional items in the abdominal cavity.

The system uses various fasteners such as screws, loops, clips, clamps etc., to attach to objects and organs within the body. These fasteners are capable of being influenced or manipulated in three-dimensional space, directly or indirectly, by a magnetic or electromagnetic field, to allow the surgeon to control intra-abdominal organs and objects without placing additional abdominal ports. The fasteners are then detached from the long tool used to place them into the abdomen. Then, an apparatus containing a magnetic field source, such as a magnet or electromagnet, is placed on the outside of the abdomen. The magnetic field produced by this apparatus is used to manipulate the fasteners attached to the objects or organs inside the abdomen, allowing the surgeon to retract or position the object around the abdomen without the use of an intra-abdominal instrument or placing additional ports.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which:

FIG. 1 is an embodiment of an intracorporeal, extracorporeal and placement apparatuses;

FIG. 2A is an embodiment of an intracorporeal apparatus;

FIG. 2B is an embodiment of a magnetically responsive portion of an intracorporeal apparatus;

FIG. 2C is an embodiment of an intracorporeal apparatus, wherein the design provides for reuse of magnetic material;

FIG. 2D is an alternative embodiment of an intracorporeal apparatus with a screw mechanism, for conversion into rotational energy;

FIG. 2E is alternative embodiment of an intracorporeal apparatus with a loop mechanism for placement of objects;

FIG. 2F is an alternative embodiment of an intracorporeal with a large loop mechanism;

FIG. 3A is a detailed embodiment of a placement apparatus;

FIG. 3B is an embodiment of a placement apparatus engaging an intracorporeal apparatus;

FIG. 3C is an alternative embodiment of a placement apparatus utilizing magnetic energy;

FIG. 3D is an alternative embodiment of a placement apparatus utilizing electromagnetic energy;

FIG. 3E is an alternative embodiment of a placement apparatus attached to an electromagnetic energy source;

FIG. 3F is an alternative embodiment of a placement apparatus with an interface to generate rotational energy;

FIG. 3G is an alternative embodiment of a placement apparatus, wherein permanent magnets used in the device may be placed in a resealable chamber;

FIG. 3H is a topical view of a connector engaged with an intracorporeal apparatus;

FIG. 4A is an embodiment of a magnetically energized extracorporeal apparatus;

FIG. 4B is an alternative embodiment of an extracorporeal apparatus containing a movable magnet mechanism;

FIG. 4C is an alternative embodiment of an extracorporeal apparatus utilizing electromagnetic energy; and

FIG. 4D is an alternative embodiment of an adhesively anchored extracorporeal apparatus;

FIG. 5 is an alternative embodiment of an intracorporeal and placement apparatuses.

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides laparoscopic surgeons a system and method to allow the surgeon to retract and manipulate intra-abdominal organs and objects without placing extra ports. Furthermore, the present invention allows the surgeon to maintain increased control over his instruments due to increased space in the body cavity.

In a preferred embodiment, the system of the invention performs its functions with three classes of magnaretractor apparatuses working together—the intracorporeal apparatus 1, extracorporeal apparatus 2, and placement apparatus 3. See FIG. 1

The intracorporeal apparatuses are the set of tools that are used to attach to an object or tissue inside a patient's body. They are designed to interact with the placement apparatus to place it in the correct position inside the body, an extracorporeal apparatus to manipulate it from outside the body, and the object or tissue the surgeon wishes to manipulate. FIG. 2A shows a preferred embodiment of an intracorporeal apparatus. The preferred embodiment comprises a body 100 of some shape such as a narrow shaft at least in one cross section having a size no greater than a trocar. This is necessary as the intracorporeal apparatus in its preferred method of use will be passed through a trocar port into the patient's body. At one end 102 of the intracorporeal apparatus body, the apparatus is adapted to attach to an object or tissue. At the opposing end 104 of the body, the apparatus is adapted to engage with a placement apparatus.

The intracorporeal apparatuses are designed to both physically engage the placement apparatus, and respond to energy from an extracorporeal apparatus. A preferred embodiment accomplishes this by using magnets 120 disposed in one end 104 of the intracorporeal apparatus opposite the fastener end 414. To aid in engaging a placement apparatus, the magnet attracts an end of the placement apparatus containing a material attracted to the magnet. When the end of the placement apparatus is drawn near the end of the intracorporeal apparatus containing the magnet, the two apparatuses are attracted. If there is no impeding material located between the placement and intracorporeal apparatuses, the two apparatuses will contact and stick to each other, end to end. Advantageously, the magnetic end 104 of the intracorporeal apparatus is rounded to align axially with the placement apparatus. This alignment is imperative to allow the surgeon to retract both the placement and intracorporeal apparatuses through the trocar as well as to allow the interfaces of the placement apparatus to correctly engage the mating nodes of the intracorporeal apparatus. To further aid engaging and aligning the intracorporeal apparatus to the placement apparatus, grooves or ridges 108 are placed on the end 104 of the intracorporeal apparatus to match the grooves or ridges 108 placed on the end of the placement apparatus. When the two apparatuses are pulled proximate to each other by their magnetic attraction, the grooves and ridges force the two apparatuses to align with the end of the placement apparatus slightly overlapping the end of the intracorporeal apparatus, and forming a tight connection.

In a similar alternative embodiment shown in FIG. 2B, a portion of the body 100 of the intracorporeal apparatus is made of a material responsive to magnetic energy, and the magnet is instead disposed in the end of the placement apparatus. With this embodiment, the magnet on the placement apparatus may be a permanent magnet or an electromagnet. The function performed by this reversed embodiment is identical to the function as described above.

As with all medical devices, sterilization is a key consideration. Typically, sterilization of medical equipment is performed using an autoclave, which amongst other things, heats the equipment to a temperature higher than any germ can withstand to kill any germs present. Unfortunately, some embodiments of the present invention utilize permanent magnets, which when heated near a certain temperature known as the Curie temperature, will permanently lose their magnetism. Therefore, special consideration in design and use must be made to ensure that the tools are both sterile and properly magnetized. The simplest procedure to ensure correct magnetization is to use a new device with a fresh magnet for each surgery. Alternatively, magnets may be employed having Curie temperatures well in excess of sterilization temperatures. Other embodiments of the invention are designed to accommodate reuse.

One such embodiment of the intracorporeal apparatus is shown in FIG. 2C and is designed to permit reusing the magnet, but allowing the choice of disposing the rest. In this embodiment, the body 100 is at least partially covered by a sterile plastic shell. The body 100 has a resealable chamber 140 proximate the end 104 which engages the placement apparatus, wherein the permanent magnet 120 is placed. In the preferred embodiment, the chamber is formed by a cap 142 over a hollows 146 in the body wherein the cap screws or presses into the rim 144 of the hollows. After a surgery, the surgical team can remove the magnet 120 from the intracorporeal apparatus, and determine whether to sterilize the rest of the apparatus or discard it. If the team chooses to sterilize its used intracorporeal apparatuses, after sterilization, the team may place an available magnet back into the resealable chamber 140 of the now sterile apparatus. The team may also choose to use an unused sterile intracorporeal apparatus, in which case they may place an available magnet into its resealable chamber 140 and reseal the chamber, preparing it for surgery. In either method, the magnet is removed after surgery, and thus never exposed to the destructive heat of an autoclave.

Another embodiment of the intracorporeal apparatus is designed around reusing the entire apparatus. In this embodiment, the body 100 is made of a magnetically inert metal. Like the previous embodiment, the body of the intracorporeal apparatus has a resealable chamber 140 proximate the end 104 to house a permanent magnet. Similarly, in the preferred embodiment, the resealable chamber 140 is formed by a metal 142 cap over a hollows 146 in the body wherein the cap screws or presses into the rim 144 of the hollows 146. After a surgery, the surgical team can remove the magnet 120 from the intracorporeal apparatus, and then sterilize this embodiment of the apparatus in an autoclave. To prepare for a surgery, the surgical team may use either an unused intracorporeal apparatus or an intracorporeal apparatus that has been autoclaved, perfecting preparation for surgery by placing an available magnet into the resealable chamber 140 and resealing the chamber. Using this embodiment and method, because the magnet was removed after surgery, it is never exposed to the destructive heat of an autoclave.

Known methods of sterilization not involving heating may, of course, be conveniently employed to sterilize the apparatus of the invention.

This structure forms the platform for nearly limitless types of attachments and fasteners to be constructed for the surgeon's use. Such conceived attachments include screws, loops, clips, clamps, and the like. A screw may be useful for piercing and driving into a thick or muscular organ, such as a uterus, to gain appropriate traction to operate. The screw embodiment of the intracorporeal apparatus shown in FIG. 2D may have a port 106 on its end 104 to receive a type of energy and convert it into rotational energy. The surgeon using this embodiment may use the rotation of the screw 210 to drive the intracorporeal apparatus into the tissue which it is desired to manipulate.

In a preferred embodiment of the screw intracorporeal apparatus, a matching placement apparatus 3 has an interface such as a rotatable knob 220 on the portion of the placement apparatus that remains outside the patient's body. Twisting the knob 220 manipulates a shaft 230 which connects to a node 240 at the end of the placement apparatus. This node engages a second mating node 250 on the screw intracorporeal apparatus. The second node 250 is in turn mechanically connected to the screw 210 by an axle 260, which is adapted to rotate independently from the body 100. Therefore, twisting the knob 220 on the placement apparatus rotates the screw 210 on the intracorporeal apparatus. The length of the screw 210 may be varied in order to obtain the optimal distance between the body part which it is desired to manipulate and the abdominal wall. Another embodiment includes a non-human powered drive in the placement apparatus to drive the shaft 230 and cause the screw 210 to rotate at a higher power than a human can exert without strain.

Another embodiment of an intracorporeal apparatus, shown in FIGS. 2E and 2F is in the form of a loop. The loop embodiment may be used to attach to an object by placing the loop around the object, tightening the loop and capturing the object. The loop can later be loosened to release the object when finished.

In a preferred embodiment of the loop intracorporeal apparatus, a matching placement apparatus 3 has an interface such as a lever, button, or trigger 320 on the portion of the body that remains outside the patient's body. This trigger 320 drives a shaft 330 which connects to a node 340 at the first end of the body. This node engages a second mating node 350 on the loop intracorporeal apparatus. This node 350 is in turn mechanically connected to one or both ends of the loop 300 such that as the node 350 moves towards the loop, the loop opens, and as the node moves away from the loop, the loop closes. Therefore, the loop opens and closes in response to the surgeon moving the trigger 320 on the placement apparatus outside the patient's body.

An additional feature is a locking mechanism which maintains the tightened loop when the intracorporeal apparatus is not engaged with a placement apparatus. The mating node 350 on the intracorporeal apparatus is tensioned with a spring 360. This spring pushes the mating node away from the loop, thus holding the loop closed. However, when engaged with a placement apparatus, the surgeon's pressure on the trigger 320 can easily overcome the spring, forcing the loop to open.

Inside the intracorporeal apparatus, the loop 300 is actuated by moving pulleys 310 and stationary pulleys 315. Moving pulleys 310 are mounted on a piston 130. The loop 300 is threaded between moving pulleys 310 and stationary pulleys 315 as shown in FIG. 2E. When the mating node 350 is pushed towards the loop, piston 130 and moving pulleys 310 advance toward the stationary pulleys 315. As shown in FIG. 2F, this shortens the internal path loop 300 must take within body 100, allowing more of the loop to extend outside body 100. When the mating node 350 is pushed towards the end 104, piston 130 and moving pulleys 310 return back to their extended position as shown in FIG. 2E. As shown in FIG. 2E, this lengthens the internal path loop 300 must take within body 100, causing less of the loop to extend outside the body 100. When force is removed from mating node 350, spring 360 causes piston 130 and mating pulleys 310 to return to this long-path state.

A third embodiment of the intracorporeal apparatus is a clip mechanism. The clip embodiment can be used to attach a surgical clip to an object proximate the end of the clip intracorporeal apparatus while retracting the object, and leaving the clip in place. In a preferred embodiment of the clip intracorporeal apparatus, a matching placement apparatus has an interface such as a lever, button, trigger on the portion of the apparatus that remains outside the patient's body. This trigger drives a shaft which connects to a node at the end of the apparatus. This node engages a second mating node on the clip intracorporeal apparatus. The second node is in turn mechanically connected by a piston 130 such that as the node moves toward the clip, the clip is expelled from the clip intracorporeal apparatus and closes permanently on the object. Therefore, the clip is closed about an object in response to the surgeon moving the trigger on the placement apparatus outside the patient's body.

In an alternative embodiment shown in FIG. 5, the placement apparatus 500 may have an interface in the form of a scissor-like mechanism 510. An additional feature is a locking mechanism 520 that maintains the placement apparatus' lever, button, trigger, or scissor-like mechanism in a position set by the user. The locking mechanism 510 prevents the shaft from moving once the user supplied force has positioned the shaft. This allows the surgeon to maintain an intracorporeal apparatus engaged with a placement apparatus in a position when trying to attach the intracorporeal apparatus to a patient's body.

A fourth embodiment of the intracorporeal apparatus is a clamp. The clamp embodiment can be used to form a simple attachment to an object whereby the surgeon opens the clamp and closes it around an object, to maintain its position. The clamp can later be opened to release the object.

In a preferred embodiment of the clamp intracorporeal apparatus, shown in FIG. 2A, a matching placement apparatus 3 has an interface such as a lever, button, or trigger 420 on the portion of the apparatus that remains outside the patient's body. This trigger 420 manipulates a shaft 430 which connects to a node 440 at the end of the apparatus. This node 440 engages a second mating node 450 on the clamp intracorporeal apparatus. The second node 450 is in turn mechanically connected by a piston 130 to one or both sides of the clamp 410 such that as the node 450 moves towards the clamp, the clamp opens, and as the node moves away from the clamp, the clamp closes. Therefore, the clamp opens and closes in response to the surgeon moving the trigger 420 on the placement apparatus outside the patient's body. An additional feature is the locking mechanism which holds the clamp tight when the intracorporeal apparatus is not engaged with a placement apparatus. The mating node 450 on the intracorporeal apparatus is spring tensioned by use of the clamp 410. The clamp is preferably constructed of a single rigid material that when at rest will close down its tines 414 to a point. For additional grip, the teeth 418 may be disposed near the end of one or both tines 414. The tines are connected to each other by a flexible filament 416 which is thread through the body 100 across pulleys 418. The piston 130 is in physical contact with the filament 416 inside the body 100. The spring function of the tines 414 keeps the filament 416 in a taut position. This taut filament 416 pushes against the piston 130 away from the clamp. However, when engaged with a placement apparatus, the surgeon's pressure on trigger 420 can easily overcome the tension placed on the filaments by the tines 414. This pressure forces mating node 450 and piston 130 to move towards the clamp 410, stretching filament 416. As pressure is applied to the filament 416, the tines 414 are forced to open.

The placement apparatuses are the tools that are used to physically position the intracorporeal apparatuses inside the patient's body and cause them to attach to objects. The preferred embodiment, shown in FIGS. 3A and 3B, comprises a body 500 having some shape with some length at least in one cross section having a size no greater than a trocar being of a length which would allow it to access distant areas within the body and allow the surgeon to comfortably operate the portion of the apparatus remaining outside the patient's body.

The preferred embodiment further comprises a connector 502 disposed on the end of the body that is placed through the trocar into the patient's body. This connector is adapted to engage and disengage any of numerous intracorporeal apparatuses 1. The connector is controlled by an engagement interface near the end of the body that remains outside the body during surgery. This engagement interface can be a button, an electrical connection to an external device or, most preferably, an engagement lever 504 that slides in the direction along the body's length, and is mechanically attached by a shaft 506 to the connector 502 at the far end of the body 500. When the engagement lever 504 is moved closer to the far end, the connector 502 moves with the engagement lever to capture and engage with an intracorporeal apparatus 1. When the lever is moved away from the far end, the connector moves with the lever to disengage and release an intracorporeal apparatus.

The preferred embodiment also comprises another interface near the end of the body that remains outside of the patient's body. This action interface transmits mechanical energy from the surgeon or another source outside the body to an intracorporeal apparatus if engaged to the placement apparatus. The preferred embodiment for the action interface is a lever in the form of a trigger 510 which is spring loaded. The trigger 510 is mechanically connected to a node 514 at the far end of the body 500 by a shaft 512. This node 514 engages with a mating node 50 on an intracorporeal apparatus 1, the intracorporeal apparatus then in turn converts the delivered energy for its uses. The action interface may also be alternatively an electrical connection to an external device.

In order to assist engaging with the preferred embodiment of the intracorporeal apparatus described above, the placement apparatus must have some magnetically responsive material to attract the permanent magnet in the intracorporeal apparatus. The preferred embodiment thus has a mass of magnetically responsive material 525 disposed within the body 500 of the placement apparatus near the end that enters the patient's body. This magnetically responsive material 525 is mechanically connected to the connector 502 and moves toward the end when the engagement interface is moved towards the end. The magnetically responsive material 525 moves away from the end further up the body 500 when the engagement interface is moved away from the end. As a result, when the engagement interface is positioned to engage an intracorporeal apparatus, the magnetically responsive material is most proximate the end of the body, and thus more easily attracted to the magnet in the intracorporeal apparatus. Furthermore, when the engagement interface is positioned to disengage from the intracorporeal apparatus, the magnetically responsive material is pulled away and outside the attractive reach of the intracorporeal apparatus magnet, thus allowing the two apparatuses to separate.

It will be appreciated that any magnetically responsive material may be utilized in accordance with the teaching of the invention. Presently preferred magnetically responsive material includes ferrous or iron-containing material, rare-earth containing materials, and the like. Exemplary magnetic materials are listed in Table 1.

In another embodiment, shown in FIGS. 3C and 3D, the placement apparatus contains a magnet 530 or electromagnet 540 disposed near the end of the body that enters the patient's body. The magnet 530 attracts the magnetically responsive material in certain embodiments of the intracorporeal apparatuses, performing the same function in aiding the surgeon to engage the intracorporeal apparatus inside the patient's body. Similarly to the preferred embodiment, this magnet 530 may be disposed within the shaft of the body 500 and mechanically connected to the connector 502. In this way, the magnet 530 moves closer to the end of the body 500 when the engagement interface is slid towards the end. With the magnet closer to the end, the placement apparatus will more easily attract the intracorporeal apparatus. Similarly, the magnet moves into the interior of the body and further from the end as the engagement interface is slid away from the end. With the magnet further from the end, the intracorporeal apparatus will be less attracted to the placement apparatus, which will cause an easy separation.

In the case of using an electromagnet 540, the system can take advantage of controlled temporary magnetism. To engage an intracorporeal apparatus 1, the electromagnet 540 is turned on, and so attracts the magnetically responsive material 120 in a corresponding intracorporeal apparatus. Similarly, to disengage the intracorporeal apparatus, the electromagnet 540 is turned off. With slight movement from the surgeon, the intracorporeal apparatus will no longer be attracted to the placement apparatus, and the two apparatuses may be separated. To power the electromagnet, a detachable power supply connects to the placement apparatus near the end that remains outside the patient's body. This power supply being external to the placement apparatus allows the placement apparatus to be made smaller. Furthermore, because it is detachable, the surgical team may detach the power supply and sterilize the placement apparatus in an autoclave as they normally would. When sterile, the team may then reattach the power supply for use in a subsequent procedure.

A preferred embodiment also comprises a third interface near the end of the body that remains outside of the patient's body. The interface 550 when activated by the surgeon causes the connector 502 and any object engaged to it to rotate about the axis of the placement apparatus. Utilizing this embodiment, the surgeon's interface 550 may articulate an intracorporeal apparatus 1 attached to the placement apparatus in a fashion similar to the manner in which surgeons currently rotate laparoscopic instruments within a patient's body.

In embodiments of the placement apparatus containing their own permanent magnets, a similar situation arises as seen in the intracorporeal apparatuses above involving sterilization. Typical sterilization in an autoclave may strip the permanent magnets of their magnetism. To prevent this in embodiments with permanent magnets, such as shown in FIG. 3G, the magnet 530 may be placed in a resealable chamber 560 proximate the end of the body 500 that is passed into the patient's body. In a preferred embodiment, the resealable chamber is formed by a cap 562 over a hollow in the body wherein the cap presses into the rim of the hollows. After a surgery, the surgical team can remove the magnet 530 from the placement apparatus, and sterilize the remainder in an autoclave. In preparation for a subsequent surgery, the team may take an unused or an autoclaved placement apparatus, place an available magnet into its resealable chamber, and replace the cap on the chamber, thereby rendering the placement apparatus ready for utilization in a subsequent surgery.

FIG. 3H demonstrates a top view of the connector and its interaction with the intracorporeal apparatus. To further aid the engagement and alignment of the intracorporeal apparatus to the placement apparatus, grooves or ridges 108 are placed on the end of the intracorporeal apparatus to match grooves or ridges 508 on the connector 502. When the two apparatuses are pulled proximate to each other by their magnetic attraction, the grooves and/or ridges 108 force the intracorporeal apparatus to align with the grooves and ridges 508 on the connector 502 slightly overlapping the end of the intracorporeal apparatus, and forming a tight connection. Additionally, the placement apparatus may be fitted with a moveable or flexible tab 509 mechanically connected to the engagement interface. This tab 509 is adapted to fit within a groove 109 on an intracorporeal apparatus in a mating fashion when the engagement interface is moved toward the end of the body. Thus, the tab thus locks the intracorporeal apparatus to the placement apparatus.

A third major component of this system is the extracorporeal apparatus. This apparatus may be used to position an intracorporeal apparatus and any object attached to it within the patient's body. Preferred embodiments of this apparatus comprise a body of some shape with an affixed handle and preferably a magnet or other source of magnetic energy. The extracorporeal apparatuses require a magnetic field source that can produce a magnetic field sufficient to manipulate objects fastened to an intracorporeal apparatus.

In the preferred embodiment shown in FIG. 4A, the extracorporeal apparatus may be shaped like a disk with the magnet 610 contained in the middle of the body 600, away from the surface. In this embodiment, the body forms a shell around the magnet, comprised of either a medically inert plastic or a magnetically inert metal or a combination of both materials. Both materials are suitable to prevent the magnet from coming in direct contact with the patient's body, but also serve the purpose of protecting the magnet. Many types of magnets used in the preferred embodiments are so fragile or brittle, that their own attraction to another magnet can cause the magnet to disintegrate upon contact. In order to preserve the magnet within, the body surrounding the magnet absorbs some of the energy in the event of an impact with a hard surface or a corresponding magnaretractor apparatus.

For sterilization purposes, the extracorporeal apparatus may be partially wrapped by a disposable or sterilizable cover 620. As with the placement and intracorporeal apparatuses, the use of permanent magnets presents a situation wherein the typical method of sterilization, i.e., use of an autoclave may destroy the magnetic properties of the magnet. After use in surgery, the surgical team may remove this cover from the extracorporeal apparatus, and either discard or sterilize it for later use. In preparation for a subsequent surgery, the team then may simply place a new or sterilized cover on an available extracorporeal apparatus. In order to ensure that the sterile cover does not separate from the extracorporeal apparatus during surgery, it is preferred that the cover comprise a form-fitting boot to frictionally adhere to the body of the extracorporeal apparatus.

An additional method to ensure the extracorporeal apparatus is sterile for a subsequent surgery is to use an extracorporeal apparatus embodiment having a resealable magnet chamber. In this embodiment, the resealable chamber 640 resides in the central area of the apparatus body 600. In the preferred embodiment, the chamber is formed by a cap 642 over a hollows in the body wherein the cap screws or presses into the rim of the hollows. After a surgery, the surgical team can remove the magnet 610 from the extracorporeal apparatus 2, and determine whether to sterilize the apparatus or discard it. If the team chooses to sterilize its used extracorporeal apparatuses, after sterilization, the team may place an available magnet back into the resealable chamber 640 of the now sterile apparatus. The team may also choose to use an unused sterile extracorporeal apparatus, in which case they may place an available magnet into its resealable chamber in preparation for surgery. In either method, the magnet is never exposed to the destructive heat of an autoclave.

In all of the above embodiments including a permanent magnet, there are many choices of magnets available with varying benefits and detriments to each of their respective uses. The magnets of the extracorporeal apparatuses must be strong enough to exert sufficient pulling (or pushing) force to permit manipulation of the desired object within the body cavity from a distance of several centimeters. For example, in performing a hysterectomy on a fibroid uterus, the magnet pulling an attached intracorporeal apparatus must reach through as much as 5 centimeters or even more of the patient's body to cause the uterus to move.

While this situation suggests the use of a larger, more powerful magnet, other considerations require the magnet to be as weak as possible without disrupting function. For instance, it is very likely that the surgeon will place more than one intracorporeal apparatus inside the patient's body. An extremely strong magnet may disadvantageously attract both the intended and an unintended intracorporeal apparatus, as well as any other objects containing magnetically responsive material in the room. Furthermore, such a strong magnet will also be physically larger than necessary to perform the procedure, thereby rendering it too unwieldy to control or anchor. A third consideration is that a very strong magnet will apply a considerable force to an object attracted to it, which may pinch tissue between the object and the magnet, with enough force to cause damage to the patient.

Accordingly, the present invention includes a set of extracorporeal apparatuses with magnets of varying sizes, shapes and materials, or an adjustable electromagnet. The first consideration for a surgical team in choosing which type of magnets to use concerns whether they will reuse the tools, and if so, how they will sterilize them. A surgical team choosing to discard used extracorporeal apparatuses is only limited in its choice by the expense of individual magnets, and therefore needs only consider the magnetic strength required for this particular patient or procedure.

Surgical teams that choose to reuse however must consider the Curie temperature for the magnet they wish to use, and a particular sterilization method. As mentioned above, using an autoclave may destroy a magnet's magnetism. Therefore, the team has three options for reuse. The first option is to choose a magnet with a Curie temperature much higher than their autoclave can generate, such as Samarium-cobalt or Alnico magnets. With this option, the team may simply place the entire apparatus into the autoclave as they would any other equipment. For many purposes, this may be an adequate solution. However, both Samarium-cobalt and Alnico magnets are weaker than Neodymium magnets, and such strength may be necessary for patients with thick adipose tissue or in procedures that require manipulation of deeply situated or heavy objects.

The second option is to choose an extracorporeal apparatus having a removable magnet in a resealable chamber. With this option, the team removes the magnet from the apparatus after use. The apparatus then may be placed in the autoclave as the team typically would to sterilize equipment. After sterilization, the team would then place the magnet back into the apparatus prior to conducting another surgery. There is no limitation to the team placing the magnet in the same apparatus, as the magnet may be placed in any available apparatuses. This option will work well in any situation, however the surgical team must take the necessary precautions.

The final option is to use permanently positioned magnets within the apparatus. After use, the surgical team may place the entire extracorporeal apparatus into the autoclave, without regard to Curie temperatures until sterilization is achieved. Since the magnet embedded in the apparatus may have been demagnetized, before use, the team must place the apparatus into a remagnetizer to return the magnet to its full magnetic capabilities. The team may perform this on-site, or return the apparatus to an appropriate vendor who can perform a remagnetizing service to re-magnetize the magnets. A preferred embodiment of a remagnetizer includes a body which physically mates with the extracorporeal apparatus to hold it in one position during the re-magnetization process. The remagnetizer exposes the magnet within the magnaretractor apparatus to a high-intensity magnetic field, which causes the magnet to retain its original magnetic field. This option may similarly be used to sterilize and re-magnetize intracorporeal and placement apparatuses.

TABLE 1
Exemplary magnets and their characteristics
	Curie
Material	Temp.	Characteristics
Cobalt (Co)	1115° C.	Very high Curie temp.
		Low strength
Alnico	800° C.	High Curie temp.
		Much weaker than SmCo and NIB
		magnets
		Much stronger than other non-rare
		earth magnets
Iron (Fe)	770° C.	High Curie temp.
		Low strength
Samarium-cobalt	680 to	High Curie temp.
(SmCo)	800° C.	Very high strength
		More expensive than NIB magnets
		Weaker than NIB magnets
		Very brittle
Nickel (Ni)	354° C.	Low strength
		Low Curie temp.
Neodymium	320° C.	Strongest permanent magnet currently
(NdFeB or NIB)		sold commercially
		Less expensive than SmCo magnets
		Low Curie temperature
		Brittle but less so than SmCo
		Highly corrosive

While the size and material of the magnet determines its strength, the shape has an effect on how much the magnetic field “falls off” over distance. For example, a magnet shaped like a long rod may be strong enough to cause an object weighing 1 kilogram from one centimeter away to accelerate towards the magnet. This same magnet can only cause the same acceleration on an object weighing 250 grams from two centimeters away or 40 grams from five centimeters away. In this situation, the strength of the magnetic field is said to fall off with the square of the distance, giving this magnet a deep reach. Although a magnet having a different shape may also be able to cause an object weighing 1 kilogram from one centimeter away to accelerate towards it, however, at two centimeters, it may only have the capacity to cause the same acceleration on an object weighing 125 grams, and from five centimeters the magnet may only cause the same acceleration on an object weighing 8 grams. In this situation, the strength of the magnetic field is said to fall off with the cube of the distance, i.e., a shallower reach. Thus, the surgeon will have the option of choosing an extracorporeal apparatus with a deeper or shallower reach.

During surgery, the surgeon may use special trocars with graduations to measure the thickness of the abdominal walls of the patient's body. With that measurement and the surgeon's knowledge of the approximate weight of the object to be moved, the surgeon may choose the appropriate extracorporeal apparatus having a magnet of the required strength amongst the plurality of available apparatuses.

The extracorporeal apparatus may be fine tuned by disposing the magnet on an articulable joint. In this embodiment, preferably utilizing a cup shape as shown in FIG. 4B, the magnet 610 may be moved closer or further away from the patient's body by manipulating the articulable joint 660. This way, the surgeon may exact greater or lesser force on an object held by an intracorporeal apparatus within the body. Additionally, the surgeon may use intracorporeal apparatuses containing its own magnets, which will interact with the magnet 610 in the extracorporeal apparatus 2. Using the articulable joint 660, the surgeon may rotate the magnet of the extracorporeal apparatus 600, which would cause the magnet of the nearby intracorporeal apparatus to rotate in sympathy. The result is that the surgeon can manipulate the attitude of the object within the patient's body by articulating the magnet attached to the extracorporeal apparatus.

Another embodiment shown in FIG. 4C uses an electromagnet 615 as the source of magnetic energy. In this embodiment, the strength of the electromagnet's 615 magnetic field is adjustable to allow the surgeon to choose the smallest field required to position a single intracorporeal apparatus, and not interfere with other apparatuses or other magnetically responsive objects. A detachable power supply cable 617 provides power to the electromagnet 615.

To ease using the extracorporeal apparatus, the surgeon may lubricate the surface 670 touching the patient's body to allow it to move more easily, and anchor the apparatus to the body, the surgical drape, the surgical table, or another fixed object, to prevent the apparatus from moving once in place.

Anchoring the extracorporeal apparatus in a fixed position may also be accomplished by using an air pump. The preferred embodiments shown in FIGS. 4A, 4B and 4C dispose a port 650 on one side of the extracorporeal apparatus which may be connect to an air pump. This port allows the surgeon to position the extracorporeal apparatus 2 on the desired point on the exterior of the patient's body. Then using the air pump, the surgeon may pump air from beneath port 650, thereby decreasing the pressure between the extracorporeal apparatus 2 and the patient's body. The resulting pressure differential will gently lock the extracorporeal apparatus in position on the patient's body. When the surgeon wishes to remove the apparatus, a release valve on the air pump may be opened, allowing normal pressure to return to the region between the apparatus and the patient's body, thus unlocking the apparatus.

The extracorporeal apparatus may also be anchored to the patient's body by use of a medical adhesive. A semi-permanent adhesive may be either placed directly on the bottom surface 670 of the extracorporeal apparatus 2, or alternatively, the adhesive may be placed around the edge of the extracorporeal apparatus as shown in FIG. 4D. The rim may be moveable to align with the lower surface 670 of the extracorporeal apparatus 2 when adhering to the patient's body, or retracted above the lower surface 670 of the extracorporeal apparatus when not adhering to the patient's body.

In a standard laparoscopy for endometriosis, three ports are opened on the patient's abdomen—the camera is placed through an umbilical port and two lower quadrant ports are used for instrumentation. Often, there is endometriosis deep in the pelvis or behind the ovary. In order to access the endometriosis and excise or fulgurate it, the surgeon must retract the ovary through one port. The peritoneum must be tented up before the endometriosis can be excised or fulgurated in order to prevent damaging the underlying structures.

With the present invention, the surgeon may start by placing the three ports: a camera in the umbilical port, and two operative ports in the lower quadrants. The surgeon then may engage a clamp intracorporeal apparatus to a placement apparatus. Using one of the operative ports, the surgeon may feed the combination through the trocar into the patient's body, and place the clamp on the ovary to be retracted. The surgeon then is able to place an extracorporeal apparatus on the exterior surface of the abdomen. The magnetic field attracts the clamp and the surgeon is able to guide the ovary towards the extracorporeal apparatus. The extracorporeal apparatus may be locked into position using an adhesive on the extracorporeal apparatus rim or an anchor. With the ovary now retracted against the abdominal wall and maintained by the extracorporeal apparatus, the surgeon is able to disengage the clamp intracorporeal apparatus from the placement apparatus and retract the placement apparatus back through the trocar and out of the patient's body. The ovary will now remain retracted against the interior surface of the anterior abdominal wall, well outside of the surgical field, and without the inclusion of a large intra-abdominal instrument. Accordingly, the surgeon will only need two intra-abdominal instruments, and may control all of the instruments in the operative field without assistance. This also beneficially results in less instrument clutter in the operative field.

The present invention can also be very beneficial when performing a laparoscopic hysterectomy. In an open abdominal hysterectomy, a cork screw is often placed in the fundus of the uterus and used for upward traction in order to decrease bleeding. The traction on the uterus also makes it much easier to access the lateral sides of the uterus and suture and ligate the uterine arteries and cardinal ligaments. One of the difficulties in performing a laparoscopic hysterectomy is that there is no way to retract the uterus in a similar fashion. It is often difficult to surgically place an extra port and use a grasper to retract the uterus. The additional grasper often gets in the way of the other intra-abdominal instruments, which are being used to carry out the dissection. Also, the surgeon is physically unable to manipulate more than two instruments at a time. Lastly, a surgeon often experiences difficulty in trying to manipulate the uterus utilizing a grasper.

The present invention, allows the surgeon the ability to retract the uterus in the same fashion as if the surgeon were performing an open abdominal hysterectomy. Initially, the surgeon would engage a screw intracorporeal apparatus with a placement apparatus, and insert the combination through a trocar into the patient's body. The surgeon is then able to position the screw and twist it into the fundus of the uterus. An extracorporeal apparatus may then be placed on the external anterior abdominal wall. The surgeon must choose an extracorporeal apparatus with a magnet strong enough to attract the muscular and massive uterus. The screw intracorporeal apparatus and the attached uterus would then be attracted towards the magnetic field of the extracorporeal apparatus. Accordingly, the extracorporeal apparatus would essentially provide upwards traction on the uterus similar to an open abdominal case. Furthermore, the extracorporeal apparatus could be moved laterally as needed to move the uterus and allow for easy access to the lateral aspects of the uterus and cervix. With the screw intracorporeal apparatus attached to the uterus, the surgeon may disengage and retract the placement apparatus through the trocar and out of the patient's body, thus freeing space within the body for other intra-abdominal instruments.

The present invention can also be used to increase performance when conducting a salpingectomy for a tubal ligation or an ectopic pregnancy. The current procedure is conducted with use of three ports: an umbilical port for a camera, and two within which to operate. The procedure requires a surgical assistant to grasp and hold the tube while the surgeon performs the resection. However the present invention allows the surgeon to perform the procedure without any assistance, and utilizing only two ports: an umbilical port for the camera, and a superpubic operative port. Initially, the surgeon would begin by engaging a clamp intracorporeal apparatus to a placement apparatus, and passing the combination through a trocar into the patient's body. At this point, the surgeon can maneuver the clamp onto the area of the tube that is to be resected. An extracorporeal apparatus placed on the external abdominal wall could then be used to retract and grasp the tube. With the tube retracted, the surgeon may disengage the placement apparatus and retract it through the trocar and out of the patient's body, thereby freeing up space for a different intra-abdominal apparatus. Next, a harmonic scalpel or other such device would be used to resect the desired portion of the tube. Accordingly, the need for an extra port and a surgical assistant is eliminated. Post-completion of the resection, the surgeon may then reinsert the placement apparatus through the trocar into the patient's body, and manipulate the clamp intracorporeal apparatus still attached to the tube. The surgeon is able to then re-engage the placement apparatus with the intracorporeal apparatus, and release the clamp from the tube. Finally, the surgeon may remove the resected tube from the abdominal cavity, retract the combination of the placement apparatus and the clamp through the trocar and seal the ports used in the surgical procedure.

The present invention may also be used to help the surgeon avoid many of the common complications of laparoscopic surgery. A common complication in laparoscopic surgery is ureteral damage. Ureteral damage, if not promptly treated, may result in damage to renal function and possibly loss of the kidney entirely. The present invention prevents damage to a ureter by the insertion of an intracorporeal apparatus such as a toothless clamp or a loop to move a ureter away from the surgical field.

The present invention may also be used in general surgical procedures. For example, laparoscopic bariatric surgery can be made more efficient using this invention. During a laparoscopic bariatric procedure, the surgeon must retract the liver. Presently, this retractor requires the use of an operative port. The present invention allows the surgeon the ability to retract the liver without the use of a trocar-occupying instrument. Accordingly, the surgery could be performed with a reduced number of ports and reduced intra-abdominal congestion.

The present invention may also be used in laparoscopic procedures performed on animals. For example, laparoscopic surgery routinely performed on baboons may be carried out more efficiently by means of the present invention. During diagnostic laparoscopic procedures, it has been discovered that the uterus and ovaries of a baboon are more mobile than those of humans. The present invention enables the surgeon to retract the uterus or ovaries of a baboon without the use of grasping forceps. This is preferable, because the use of grasping forceps has been reported to result in slight round ligament bleeding in some laparoscopic procedures performed on baboons. Laparoscopic surgery is also performed on other animals, including mammals such as dogs, llamas, alpacas, mares, lions and cows. The present invention will enable surgeons to accomplish such operations in a more efficient manner, as in humans.

Numerous additional advantages may be realized by those having ordinary skill in the art, for any situation in which a surgeon has thorough knowledge of regional anatomy and requires moving internal objects or organs so as to gain access to another object or organ in the body.

Claims

1. A method for performing a surgical procedure, comprising: creating an opening into a body cavity;introducing a placement apparatus engaged to a detachable clamp through the opening,wherein the clamp comprises magnetically responsive material and the placement apparatus comprises a disengagement mechanism configured to slide within the placement apparatus;fixing the clamp to tissue within the body cavity; disengaging the clamp from the placement apparatus; removing the placement apparatus from the body cavity; andmoving the clamp while fixed to the tissue within the body cavity using a magnetic field.

2. The method of claim 1, wherein the placement apparatus is introduced through a port.

3. The method of claim 1, wherein the surgical procedure is bariatric surgery.

4. The method of claim 1, further comprising introducing through the opening a tool to resect the tissue.

5. The method of claim 1, further comprising resecting the tissue.

6. The method of claim 1, wherein the magnetic field is generated by an extracorporeal apparatus.

7. The method of claim 1, further comprising using an extracorporeal apparatus comprising a source of magnetic energy to interact with the magnetically responsive material, thereby moving the clamp.

8. The method of claim 1, further comprising adjusting the magnetic field.

9. A system for retraction of tissue, comprising: an intracorporeal apparatus comprising a first end and a second end comprising a magnetically responsive material, wherein the first end is configured to attach to the tissue and the second end is configured to be selectively disengaged from a placement apparatus,the placement apparatus comprising a selective disengagement mechanism configured to selectively disengage from the intracorporeal apparatus,

10. The system of claim 9, wherein the intracorporeal apparatus further comprises a spring.

11. The system of claim 9, wherein the tissue comprises a gall bladder.

12. The system of claim 9, wherein the human tissue comprises tissue selected from the group consisting of an ovary, uterus, Fallopian tube, section of intestine, liver, and stomach.

13. The system of claim 9, wherein the tissue comprises animal tissue.

14. A system for retraction of tissue, comprising: an intracorporeal apparatus comprising a first end and a second end comprising magnetically responsive material, wherein the first end is configured to attach to the tissue and the second end is configured to be selectively disengaged from a placement apparatus;the placement apparatus comprising a selective disengagement mechanism configured to selectively disengage from the intracorporeal apparatus; andan extracorporeal apparatus comprising a source of magnetic energy configured to move the second end of the intracorporeal apparatus.

15. The system of claim 14, wherein the placement apparatus is configured to coaxially engage the second end of the intracorporeal apparatus.

16. The system of claim 14, wherein the second end of the intracorporeal apparatus is rounded.

17. The system of claim 14, wherein a distal end of the placement apparatus comprises at least one groove configured to engage with at least one groove of the second end of the intracorporeal apparatus.